Contents. Overview 3. Structure 23

Transcription

1 Technical Summary

2 Contents Overview 3 Architectural Summary Specification 4 Building Description 5 Location Map 6 Design Criteria 7 Floor Areas and Heights 7 Floor Plans 8 Exterior Envelope 15 Internal Design and Finishes 16 Public Art 19 Refuse and Waste 20 Accessibility 20 BREEAM 20 Fire Safety 21 Acoustic Performance 21 Sanitary Provision 22 Structure 23 Building Services Outline Specification 26 Design Criteria 27 Mechanical Services Description 29 Controls Services Description 30 Electrical Services Description 31 Public Health Services Description 35 Vertical Transportation Services 37 Professional Team 40 Imagery 42 Building Elevations 43 Internal CGIs 45 prime mayfair office development 33 davies street 2

3 Overview This document is a description of the shell and core elements of the works and also the Category A fit-out of the works carried out by the Developer. prime mayfair office development 33 davies street 3

4 Architectural Summary Specification prime mayfair office development 33 davies street 4

5 Architectural Summary Specification Introduction Building Description Overview The proposal for the redevelopment of 33 Davies Street received Planning Permission and Conservation Area Consent from the Westminster City Council on 29th June Location 33 Davies Street is situated on Davies Street in the heart of the Mayfair Conservation Area within the City of Westminster. The site is situated at the corner of Davies Street and Grosvenor Street in the south and the corner of Davies Street and Three Kings Yard in the north. In addition to these street façades the building shares a courtyard to the rear with the residential property at No 32 Grosvenor Street. Building Accommodation The new development has required the complete demolition of the pre-existing 1930 s building including the basement and foundations. The new building consists of: Basement: Retail space, bicycle parking and changing facilities, toilets, refuse store, electrical sub-station, plant rooms and comms room Ground floor: Retail space, office reception, building manager s office, toilet First to fifth floors: Office accommodation and associated toilet facilities. Sub-Division The building is designed to facilitate both a single occupier and a multi tenancy arrangement split on a floor by floor basis. Office Space The office reception is positioned in the central bay along Davies Street. The reception is designed to service multiple tenants and includes a reception area and a rear waiting area, whilst providing direct access to the vertical circulation in the central core. An open feature staircase leads from reception to the upper floors. The typical office floors are arranged around a linear core located against the courtyard area. Structural columns are arranged around the perimeter of the building spanning back to the core and providing flexible column free floor plates. Retail Space The retail space at ground floor consists of two spaces, one either side of the office reception. Each of these spaces can be sub-divided giving potentially four retail tenancies. Two structural openings are provided from the ground floor to the basement to allow the linking of the retail areas. The design of the ground floor structural incorporates a soft spot to allow a third unit access to the basement. The permanent retail stairs and lifts to lower ground floor will be installed as part of the tenants fit-out. prime mayfair office development 33 davies street 5

6 SEYMOUR STREET CAVENDISH SQUARE MARGARET STREET MARBLE ARCH OXFORD STREET BOND STREET OXFORD STREET OXFORD CIRCUS PARK STREET UPPER BROOK STREET UPPER GROSVENOR STREET NORTH AUDLEY STREET GROSVENOR SQUARE DUKE STREET DAVIES STREET BROOK STREET BOND STREET HANOVER SQUARE HANOVER STREET REGENT STREET MADDOX STREET GREAT MARLBOROUGH STREET PARK STREET SOUTH STREET SOUTH AUDLEY STREET GROSVENOR STREET MOUNT STREET HILL STREET BERKELEY SQUARE NEW BOND STREET BRUTON STREET GRAFTON STREET NEW BOND STREET SAVILE ROW PARK LANE ALBEMARLE STREET CONDUIT STREET REGENT STREET CURZON STREET CHARLES STREET DOVER STREET ROYAL ACADEMY PICCADILLY PICCADILLY CIRCUS HYDE PARK GREEN PARK BERKELEY STREET STRATTON STREET HERTFORD STREET ST JAMES S SQUARE PALL MALL ST JAMES S prime mayfair office development PALACE 33 davies street 6 PICCADILLY Location Map

7 Architectural Summary Specification Design Criteria Floor Areas Floor Heights Floor Area (Net Internal) sq m sq ft Basement Retail ,919 Ground South Retail ,761 Ground North Retail ,932 Ground Total Retail ,693 Level Description Raised Floor (Gross) (mm) Finished Floor to Ceiling (mm) Finished Floor Level (m AoD) Structural Slab Level (m AoD) Structural Slab to Structural Slab (over) (mm) Basement and Ground Retail ,612 First ,820 Second ,998 Third ,000 Fourth ,998 Fifth ,044 Office Total ,860 Total Net Lettable ,472 6 Roof Offices 100 2, ,550 4 Offices 100 2, ,550 3 Offices 100 2, ,550 2 Offices 100 2, ,550 1 Offices 100 2, ,550 0 Retail North 0 4, ,100 0 Office Reception 100 3, ,640 0 Retail South 0 3, ,155 B Retail North 150 2, ,600 B Retail Central 150 3, ,060 B Retail South 150 3, ,545 Area of 3.3m 2 of soft spot for future lift shaft opening to the retail units at ground floor included in measurement. Areas are on a net internal basis and are subject to measurement on site as built. prime mayfair office development 33 davies street 7

8 Ground Floor Plan Reception 140 sq m / 1,504 sq ft North Retail sq m / 1,932 sq ft South Retail sq m / 1,761 sq ft SIDE ENTRANCE / CYCLE ACCESS LOUNGE AREA Grosvenor Street SERVICE LIFT RISER LIFT LIFT RECEPTION RISER Three Kings Yard Franck Namani Franck Namani Davies Street N prime mayfair office development 33 davies street 8

9 Lower Ground Floor Plan Retail sq m / 3,919 sq ft 38 CYCLE STORE SPACES Grosvenor Street SERVICE LIFT RISER LAUNDRY 1 LIFT 38 LOCKERS 2 LIFT CHANGING ROOM 3 4 RISER Three Kings Yard Franck Namani Davies Street N prime mayfair office development 33 davies street 9

10 First Floor Plan sq m / 5,820 sq ft Grosvenor Street RISER LIFT LIFT RISER Three Kings Yard DOUBLE HEIGHT ENTRANCE Davies Street N prime mayfair office development 33 davies street 10

11 Second Floor Plan sq m / 5,998 sq ft Grosvenor Street RISER LIFT LIFT RISER Three Kings Yard Davies Street N prime mayfair office development 33 davies street 11

12 Third Floor Plan sq m / 6,000 sq ft Grosvenor Street RISER LIFT LIFT RISER Three Kings Yard Davies Street N prime mayfair office development 33 davies street 12

13 Fourth Floor Plan sq m / 5,998 sq ft Grosvenor Street RISER LIFT LIFT RISER Three Kings Yard Davies Street N prime mayfair office development 33 davies street 13

14 Fifth Floor Plan sq m / 5,044 sq ft Grosvenor Street RISER LIFT LIFT RISER Three Kings Yard Davies Street N prime mayfair office development 33 davies street 14

15 Architectural Summary Specification Design Criteria, cont d Exterior Envelope Planning Grid The building is designed on a 1.5 metre planning grid, following through from window location to ceiling and lighting layouts. Building Regulations, Statutory Legislation and Construction Standards The building is designed to the current edition of the Approved Documents of the Building Regulations and based on the recommendations of the latest edition of the British Standards BS/BS EN. Where there is no relevant British Standard then the appropriate industry recognised and accepted European or International Standards will be used (where not over-ruled by this BBD). Design Life of Building Components The building is to have a design life developed in accordance with the procedures set out as per BS ISO and BS 7543:2000. Services plant and equipment generally in accordance with CIBSE Guide to the Ownership, Operation and Maintenance of Building Services March 2000 Table B14.3. The design life of the building structure, maintainable without major replacement, will be a minimum of 60 years. Design Concept The proportion of the overall building mass is broken down into a series of five bays along Davies Street and two along both Grosvenor Street and Three Kings Yard. This division is reflected in plan with a projection of the central and end bays. The materials and finishes have been designed as a careful response to the prevailing character of both the immediate and the wider surrounding conservation area. A rusticated Portland Stone base forms the base of the building above which the first floor is emphasised with taller windows and stone surrounds and string course. Similarly following the classical tradition is the presence of a stone cornice between third and fourth floor, above which the windows form the equivalent of a frieze in brickwork. The elevation is composed of recessed brickwork details on different planes. The windows are to be bronze anodised aluminium framed with vertical and horizontal sub-divisions. The fifth floor is conceived as a traditional composition of a metal roof finish and dormers. The dormers are highlighted by a pre-cast concrete (to match Portland Stone) surround, continuing the language used for the other windows. The recessed panels at the roof are clad in a bronze finished copper alloy. The masonry elements will be pre-cast concrete panels faced in brick and stone. Materials and Components The masonry elements will be pre-cast concrete panels faced in brick and stone. Brick Faced Cladding The bricks are a handmade red brick with a face size of 290x50mm laid as pre-cast elements in a custom designed Flemish bond. Stone Faced Cladding Stonework is fabricated as pre-cast concrete elements faced with Portland Basebed Stone with Cornish De Lank Granite base. 5th Floor Pre-cast Concrete Cladding Acid etched pre-cast concrete cladding to match Portland Stone. Shop Front Glazing and Doors Bespoke Architectural Bronze framing with single glazed low iron glass. Double glazed doors with Architectural Bronze frame and ironmongery. prime mayfair office development 33 davies street 15

16 Architectural Summary Specification Exterior Envelope, cont d Internal Design and Finishes Two Storey Office Entry Screen Architectural Bronze framework. Glass is double glazed low iron glass. Double glazed doors, three metre high, with Architectural Bronze frame and bronze ironmongery. One set of doors powered assisted to provide access to people with disabilities. Windows First To Fifth Floor Bronze anodised aluminium slim profile side hung openable windows. Glass is double glazed low iron high performance solar control glass. Roof Plant Enclosure The plant enclosure consists of acoustically treated bronze anodised extruded aluminium louvres & doors. Roof Construction Inverted roof system on concrete deck. High performance modified bitumen reinforced membrane, drainage layer, insulation, separating membrane and 600x600x50mm concrete paving. Roof finishes to include extensive sedum green roof system. Reception Design Concept The palette of high quality materials emperador marble, routed limestone, American walnut, bronze and finest Italian leather are all used to create a rich, welcoming space. Office Entrance Lobby A bespoke reception desk is provided with small power sockets, telephone point, three compartment trunking back to the adjacent electrical riser. The area incorporates localised heating and a floor rail to prevent the reception chair on wheels from damaging the tube feature wall. Finishes are: Wall finishes: Stone, leather and timber panels Floor finishes: Honed hard limestone including mats and matwell at doors Ceiling finishes: painted drylined ceilings GRG (glass reinforced gypsum) upstands at concealed lighting Bespoke decorative panel behind reception desk Programmable feature lighting is provided in the entrance lobby, designed by the specialist Lighting Design Consultant. Toilets Toilet fit-out will comprise: Walls: Fully vitrified Porcelain Ceramic, etched glass panels, and drylining Floor: Fully vitrified Porcelain Ceramic Skirtings: Brushed stainless steel Ceiling: White painted dry lining/gypsum plank/ timber veneered ceiling Doors: Walnut timber veneered and with solid hardwood frame Toilet partitions: Full height 45mm thick solid core high quality walnut veneered panels Lighting: Downlighters switched from the toilet lobby PIR detector. Concealed lighting at rear of cubicles Sundry toilet items: Mirrors, single toilet roll and spare holders, paper towel dispensers, coat hooks, door stops, and towel bins Full height mirror Vanity tops: Limestone The sanitary fittings for the toilets are as follows: White vitreous china wall mounted WC pans, seats and covers together with duct mounted 6 litre cisterns, flush pipes, and flushing handles/buttons Vitreous china basins with automatic stainless steel mixer spray taps prime mayfair office development 33 davies street 16

17 Architectural Summary Specification Internal Design and Finishes, cont d Disabled Persons Toilet High quality finishes are as those in the main toilets. Lighting is by downlighters switched from a PIR within the disabled person toilet. Disabled person sanitary fittings and stainless steel grab rails to be provided. Disabled Alarm with facility to link to the BMS in Category A. Sundry toilet items as main toilets. Cleaners Cupboard A cleaner s cupboard incorporating sink, hot and cold water and lighting are provided, at all office levels: Walls are painted dry lining and ceramic tiled sink splash back Floor and skirtings are ceramic tile Shelving No ceiling BMS/Security Room/Fire Command Centre This room has the following finishes: Painted drylined walls Metal tile ceiling Raised access floor with carpet tile Shower Changing Room Space is provided for a shower room and changing facility for cyclists and staff within the basement area, 3 No. showers & 1 No. disabled shower/wc with appropriate provision for drainage. 38 cycle spaces, 38 lockers and a laundry room are provided. Finishes as follows: Walls: Ceramic fully vitrified Porcelain tiles from Domus range and drylining Floor and skirtings: Ceramic Vitreous Porcelain tiles from Domus range Ceiling: White painted dry lining/ metal ceiling pan Doors: Walnut veneered and with solid hardwood frame Shower partitions: Full height drylined partitions with ceramic tiles Lighting: Downlighters switched from the toilet lobby PIR detector Sundry toilet items: Mirrors, single toilet roll and spare holders, paper towel dispensers, coat hooks, door stops, and towel bins Counter tops: Hardwood Coat hooks in WC cubicles and general space Lockers and benches: Hardwood Lift Finishes Passenger lift cars: Architectural Bronze internal and external doors and architrave at ground floor with bronze anodised aluminium doors and architrave on the upper floors. High quality wall finishes of Italian leather panels with black American Walnut trim. Polyester coated metal ceiling with concealed cove and point lighting. Shell Gris cladding with emperor marble floor finish to match entrance lobby. Architectural bronze control panel and handrails. Doors, Frames and Ironmongery Flush solid core walnut veneered doors with hardwood frames and lippings with polished finish are provided to all doors at office levels. Doors have stainless steel finish ironmongery. Painted flush steel doors and frames are provided in general service areas, such as plant rooms, storage areas, service corridors, etc and service access doors/panels around the cores. Office Finishes Office external and core walls are paint finished. prime mayfair office development 33 davies street 17

18 Architectural Summary Specification Internal Design and Finishes, cont d Category A Office Fit-Out Finishes Floor Finishes Main stair lobbies: Carpet (painted/vinyl below ground floor). Plant rooms: Sealed/painted concrete with skirting as appropriate. Service corridors: Sealed concrete. Storage: Sealed concrete. Wall Finishes Stairs and secondary stair lobbies: Painted drylining. Stair core 2 to be impact resistant board. Office core walls and lift lobbies: Painted drylining with skim coat to accept the Category A Specification finishes. East wall facing office reinforced to allow hanging of art. Walls in plant rooms: Painted fair faced blockwork and/or drylining. Service corridors: Painted fair faced blockwork /concrete. EDF incoming service room: To EDF specification. Ceiling Finishes Main landings (main core): Painted drylining with skim coat. Office ceiling: Tegular 750x750mm metal grid with 750x750mm modular perforated metal ceiling tiles with acoustic pad backing. Tiles formed with 600x600mm solid edge opening to accept light fittings and diffusers. Basement back of house: Painted soffit. Escape Stair Finishes Pre-cast concrete generally with carpet finish with nosings. Concrete/steel landings, carpet finish. Stainless steel handrails and balusters. Painted dry lining stair walls. Painted soffits. Stone clad feature stair from reception to first floor. External Finishes Replace to new levels perimeter pavement to building threshold, comprising York Stone and Granite Kerbs. York Stone flooring to the Portico. Finishes The office areas will be finished to following Category A standard. Floors Medium grade (to PSA Method of Building Performance Specification MOB PF2 PS/SPU March 1992) raised access flooring with a nominal depth of 100mm on all office floors (inclusive of panel), comprising 600x600mm carpet tiles (not to be installed). Note: The MOB loadings for medium grade are as follows: Concentrated static load: Not less than 4.5kN over 300mm sq and not less than 3.0kN over 25mm sq Uniformly distributed load: Not less than and 8.0kN/m 2 All necessary plenum barriers, fire breaks and closure details are provided. The concrete floor has a sealant applied to it prior to the installation of the raised floor. Applied MDF painted skirting to the drylined core walls, perimeter walls (solid). prime mayfair office development 33 davies street 18

19 Architectural Summary Specification Category A Office Fit-Out Finishes, cont d Public Art Walls Base mist coat plus two coats of vinyl matt emulsion finish on skim coat to plasterboard walls, is provided on core walls, internal and external columns and other exposed walls in office areas. Suspended Ceilings Suspended ceiling comprising fully accessible polyester powder coated perforated metal pan ceiling tiles, fixed into a visible tegular drop-in suspension system. Suspended ceiling includes fully recessed luminaries/downlighters, and grilles etc fire stopping, access panels and insulation matting fully concealed in black plastic wrapping. Suspension system and fixings are of galvanised steel. The ceiling tile system is laid out on a 750mm modular grid centred on the base building planning grid. Plasterboards margins to perimeter on galvanised steel suspension system. The office ceiling system has an acoustical absorption NRC value of approximately 0.8. Internal Signs Statutory signs are provided in net lettable space as follows: Fire exits Fire doors Fire fighting lift lobbies All other statutory signs as required Office and retail tenant signage, builderswork and brackets by tenants Blinds Anti-glare blinds to be provided to all office windows. The portcullis gates to the entrance to the office are a special commission by artist Wendy Ramshaw. Cast in bronze the three gates mechanically move up to an open position during working hours and can be lowered to a closed position outside working hours. prime mayfair office development 33 davies street 19

20 Architectural Summary Specification Refuse and Waste Accessibility BREEAM The waste storage room serving the building is located at basement level. In total fourteen number 1100 litre Euro bins are provided in accordance WCC Waste Storage Guidance. Refuse is collected on Grosvenor Street. Accessibility of the building is detailed in David Bonnet Associates AFE Stage D accessibility report. Provisions for people with disabilities will be in accordance with the Building Regulations Part M 2010 and in line with the DDA requirements. The development is designed to achieve BREEAM 2008 Excellent rating. Means of Escape Associated with the stair cores a place of refuge has been allocated per stair. An appropriate facility is provided for communication between the refuge and the fire control centre by people with disabilities. Circulation Reception area only: One power assisted pivot door to office Reception (power operated) to suit peak through flow. Retail units: Manual door with provision for cable connection for power assisted door mechanism (door mechanism to be provided by retail tenant if required). prime mayfair office development 33 davies street 20

21 Architectural Summary Specification Fire Safety Acoustic Performance For fire purposes the building is designed to comply with the requirements of statutory regulations and authorities. Refer to Fire Strategy Report by SAFE. Means of Escape Means of escape is designed on the basis of one person per 6m 2 for office floors and based on the area covered by the Category A Specification Works. The Base Building design allows for the office space, subject to the completion of fit out in accordance with the Category A Specification, to achieve a maximum noise criterion of NR38 from the Base Building Services installations, without any other contributions. The maximum noise criteria from the Base Building services installations for other areas are as follows: Criteria for Plant Noise Transfer to Internal Areas All noise levels quoted are applicable when Base Building plant is running under normal operation only, i.e. not under emergency operation. The staircases are designed for simultaneous evacuation of all floors in the case of normal office occupancies. Tenant/Area Noise Criterion Ventilation Systems Serving Actual Area All Other Systems Fire Separation Structure and enclosures for specific areas have been designed with the following fire resistance: Structure above ground floor (except roof) Escape cores Lower ground, basement and ground floor structure Retail EDF room 1hr 1hr 1hr 1hr 4hrs Open plan offices NR38 NR33 Circulation areas/lobby NR40 NR35 Toilets NR45 NR40 Retail stores NR45 NR40 Service areas NR55 NR50 Plant rooms To suite adjacent areas (see above) prime mayfair office development 33 davies street 21

22 Architectural Summary Specification Sanitary Provision Notes Number of sanitary fittings taken from BS6465:Part 1:2006 A 2009 Table 4. The three WC s and three basins provide for persons, male or female. Male Toilets 12m²/Person, 60:60 Male:Female Floor Office Area Occupancy No. of Males Male Male Male 12m²/Person (60%) WC's Urinals Basins First Second Third Fourth Fifth Female Toilets 12m²/Person, 60:60 Male:Female Floor Office Area Occupancy No. of Females Female Female 12m²/Person (60%) WC's Basins First Second Third Fourth Fifth prime mayfair office development 33 davies street 22

23 Structure prime mayfair office development 33 davies street 23

24 Structure Substructure The new basement slab is a reinforced concrete raft and distributes the building loads to the London Clay below. The waterproofing system for the basement has been designed to the equivalent of Grade 3 in accordance with BS 8102:2009:Table 2. In addition to external tanking the basement raft and perimeter concrete walls have been designed and detailed to BS8007 (Code of Practice for Design of Concrete Structures for Retaining Aqueous Liquids). Foundation Settlement Settlements, differential settlements, heave and lateral movement will be limited so that the building construction and finishes are not compromised. The minimum performance criteria for foundations shall result in a residual 10mm (maximum) total long term settlement and 5mm differential movement between adjacent columns. Differential settlement between horizontal has been designed not to exceed a 1:500 gradient. Superstructure The superstructure generally consists of a steel frame with composite reinforced concrete slabs supported on permanent metal formwork. Stability is provided by the reinforced concrete lift and stair cores acting as cantilevers from the raft slab. Wind loads are transferred to the cores via diaphragm action of the composite floor slab. The office floors have been designed so that the magnitude of the floor vibrations will generally be limited to a Response factor of 8 as defined by SCI Publication P354 in all areas. The natural frequency of elements of the floor will not be less than 4Hz. Vibration shall not exceed the levels defined for offices in table 5 of BS6472 with reference to the base curve in figure 2. Internally, fire protection to steelwork is provided by intumescent coating. Steelwork will be minimum grade S355. Deflections The deflection of floor elements due to imposed loads will be limited to the lesser of span/360 or 30mm under full-imposed load. The pre-cast concrete building façade is supported off the building columns therefore; the edge beams have not been designed to different criteria. Loading Criteria Structural provisions will be made to correspond with the requirements of the final plant replacement strategy. The floor slabs are generally designed to accommodate the following uniform live loads (kn/m 2 ): Area kn/m² Design Partition Load Load Office Retail Storage areas 7.5 Circulation/toilet cores 4.0 Basement plant 7.5 Roof plant 4.0 Roof maintenance access 1.5 Highway surcharge 10.0 On every office floor a 1.5m zone located around the stair cores is designed to accommodate an uplifted uniform live load of 7.5kN/m² together with a reduced floor live load of kN/m² to the remainder. Dead loads will be subject to chosen structural design details plus an allowance of 0.85kN/m² for ceiling, services and raised floors. prime mayfair office development 33 davies street 24

25 Structure Loading Criteria cont d Design Standards Structural design is in accordance with relevant British Standards current at Building Control submission. Where a standard does not exist due consideration will be given to use standards of other countries making sure that they are suitable for the particular application. In the event of variation the appropriate standard should apply. Tolerances Office floors will be finished exposed concrete to accept raised flooring with tolerances complying with the National Structural Steelwork Specification for Building Construction (3rd edition) and National Structural Concrete Specification for Building Construction (2nd edition) as amended by relevant Ramboll specifications. Fire Resistance Structural elements have the degree of fire protection appropriate to their location and not conflict with finishes specified elsewhere. In principle a one hour fire protection is required to all the elements, except for the areas of the roof not forming part of a stability system which do not require fire protection or the basement which will require a two hour fire rating. Fire resistance for concrete elements is inherent to the material and no additional protection is required. Intumescent paint or alternative systems will need to be applied to steelwork elements requiring fire protection. External grade intumescent paint to be applied to externally exposed structural steelwork. (For comprehensive structural fire protection, refer to structural fire report from SAFE SAF- C0030-FS-005-RB). Corrosion Protection Cover to reinforcement has been determined in accordance with BS 8500 depending on location to prevent corrosion. Typically, cover to basement elements is 40mm and 30mm to superstructure elements. Cover to faces of elements in contact with the ground to be a minimum of 50mm. The recommended concrete class for concrete in contact with ground is AC-2 (based on table 2 of BRE Special Digest 1 Part 1, 2001). All structural steel elements shot-blasted to Sa2½ and have the degree of protection appropriate to their location in both temporary and permanent exposure conditions to ensure adequate durability throughout the life of the structure. Concrete Generally Concrete strength is RC40 to the basement construction and RC35 to the suspended composite concrete slabs. All reinforcement bars and mesh to have a minimum yield strength of 460N/mm 2. Tolerances Placing of the concrete shall be within the range of deviation normally achievable for construction, as detailed in BS 5606:1990, except that no point or surface above ground shall deviate from its nominal position or level by more than 20mm. Steelwork fabrication and erection tolerances to be in accordance with the National Structural Steelwork Specification (3rd edition) as amended by the Ramboll Steelwork specification. Public Health/Below Ground Drainage All below ground drainage designed and installed in accordance with The Building Regulations Part H1, inclusive of all current amendments, BS EN 752: 2008 and BS EN (all sections). prime mayfair office development 33 davies street 25

26 Building Services Outline Specification prime mayfair office development 33 davies street 26

27 Building Services Outline Specification Building Services Design Criteria Introduction The new development is provided with a full Mechanical, Electrical, Public Health and Vertical Transportation services installation. The services are designed and specified to meet an established level of fit-out standards. The services are designed in accordance with all relevant standards, current building regulations and recognise established benchmarking in respect to good engineering practice such as BCO, CIBSE and British Standards. The services are designed in accordance with the requirements of BREEAM 2008 to achieve an Excellent rating for the office building. Green technologies, such as photovoltaic arrays, and energy efficient design measures are employed to reduce CO 2 emissions to meet the requirements of Part L 2010 of the Building Regulations and achieve an EPC rating of 40 or less. The building is designed to incorporate plant rooms within the basement and roof areas. The plant is located to optimise the distribution routes and provide good access for maintenance purposes. Services distribution is by means of dedicated vertical risers. Risers are incorporated within the structural constraints of the building to ensure servicing zones are kept to a minimum. In addition to the base build servicing strategies, provisions are made for future tenants servicing requirements. Space is provided on the roof and in the risers for potential future tenants DX condensers and pipework, tea point services and showers. The building offers the following flexibility features and provisions for the incoming tenants future use: Plant space on the roof for future tenant plant Spare connections on the air conditioning system to install additional fan coil units on the floors Openable windows for additional fresh air Spare louvres or spare space in louvres on both sides of the courtyard for the installation of additional fresh air fans or extract from a tea point, shower or small kitchen Additional allowance in the building electrical supply infrastructure Capped services provisions in both risers to accommodate a tea point, a shower or both Upgraded services connections in the south riser on the fifth floor to accommodate a full catering kitchen The building provides the incoming tenants with a high level of flexibility to facilitate incorporating the requirements of their Category B fit-out without the need for major works. The design criteria for the new development follows the recommendations of CIBSE and The British Council for Offices (BCO), as described in the 2009 Guide to Specification, and as noted below. Mechanical External Temperatures Summer: 30 C db, 20 C wb Winter: -4 C saturated For heat rejection plant: 35 C db Internal Temperatures Open plan: Summer: 24 C +/ 2 C (i.e. in cooling mode, the system shall cool the space to this temperature) Winter: 20 C +/ 2 C (i.e. in heating mode, the system shall heat the space to this temperature) Office reception/building manager s office: Summer: 24 C +/ 2 C (i.e. in cooling mode, the system shall cool the space to this temperature) Winter: 20 C +/ 2 C (i.e. in heating mode, the system shall heat the space to this temperature) Office toilets/changing room: 19 C min Corridors/staircases: 19 C min Occupancy: 1 person/10m 2 prime mayfair office development 33 davies street 27

28 Building Services Outline Specification Design Criteria, cont d Mechanical cont d Heat Gains Occupancy: 90W sensible/50w latent Lighting: 12W/m 2 Small power: 25W/m 2 Fresh Air Ventilation Rates Office open plan: 12 l/s per person + 10% additional allowance for meeting rooms/areas of high occupation density. This equates to 12 l/s per person at an occupation density of 1 person/9m 2 Office toilets: Transfer from adjacent office space Changing room: 10 a/c per hour Cleaner s cupboard: None Corridors/lobbies: None Extract Ventilation Rates Office toilets/showers: 12 a/c per hour Cleaner s cupboard: 6 a/c per hour Corridors/lobbies: None Noise Levels Open plan offices: NR40 Speculative offices: NR38 Cellular offices: NR35 Electrical Load Densities Tenant small power provision: 25W/m 2 Tenant small power additional allowance: 75W/m 2 on any one floor Tenant lighting provision: 12W/m 2 Tenant mechanical services provision: 60W/m 2 Overall raised floor finish zone of 100mm with 64mm void Illumination Levels Tenanted demise office lux at the working plane Toilets: lux at floor level Lift Lobbies: lux at floor level Stairs: lux at landing floor level (70 lux minimum at centre tread) Entrance: Lobby Special feature lighting to architectural requirements Common areas: lux at floor level Fire Alarm To BS 5839 L2 Emergency Lighting To BS 5266 Lightning Protection To BS EN and BS 7430 Small Power Installation 17th edition BS7671 Public Health The public health services design take due account of all current relevant British Standards, the requirements and Regulations of Local Authorities and the recommendations, insofar as they apply to this project, concerning the control of Legionella Pneumophila as contained within the CIBSE TM document and the Health and Safety Commission Guidance Booklet L8 formerly HS (G) 70. Population Density 1 person per 10m 2 Male/Female Split 60/60 throughout Cold Water Storage Offices = 20 litres per person based on a half day storage. The domestic cold water system are designed and arranged so that no stagnation occurs, and adequate backflow protection is provided to meet the requirements of the Water Supply (Water Fittings) Regulations Hot Water Provision Local unvented storage cylinders. Tenant s Tea Points Connections available at each core on soil, vent and cold water risers for extension by tenant. prime mayfair office development 33 davies street 28

29 Building Services Outline Specification Design Criteria, cont d Mechanical Services Description Public Health cont d Tenant s Showers Connections available at each core on soil, vent and cold water risers for extension by tenant Tenant s Kitchen Connections available in the south core on the fifth floor on soil, vent and cold water riser for extension by tenant. Surface Water Roof drainage is be designed in accordance with BS EN and Building Regulation H utilizing roof outlets. All rainwater outlets and pipe sizing is based upon a storm intensity of litres/second/m² to suit the existing building infrastructure capacities. Pipe Sizing Pipe sizing of the hot and cold-water distribution systems is carried out using the Loading Unit method. Soil and Waste Soil and wastewater sanitary pipework is designed and installed in accordance with BS EN and Building Regulation H. The systems are designed as a fully ventilated single stack system. All pipe sizing is carried out using the Discharge Unit method. Heating and Cooling Each office tenant s space is heated and cooled using a high COP heat recovery VRF system. The system is capable of simultaneously heating and cooling individual spaces as required. Ducted concealed indoor units are located in the ceiling void to serve perimeter and internal zones as per the BCO guidelines. Around the perimeter of the building, one indoor unit is provided for each notional 6.0mx4.5m office module while for the internal areas, one indoor unit is provided to serve a maximum zone area of 70m². Heat from the VRF systems is rejected via air cooled condensers located within the louvred plant enclosures at roof level. Each tenant s space independent VRF system is fed, electrically, from the corresponding tenant s distribution board providing the facility of direct billing. Each air cooled condenser is connected to the indoor units via refrigerant pipework mounted on dedicated trays and routed vertically through the building inside the two main risers. On the floors, pipework is distributed to the indoor units by means of master and slave BC zone controllers provided with spare ways to allow the tenant to add indoor units to suit the fit-out requirements. A centralised system controller, one per tenant s space, is located within the tenant s riser and is capable of controlling the indoor units individually or as a group. The controller is also connected to the central BMS and have the capability to be networked to other controllers should a future tenant occupy more than one floor or the whole building. The indoor units supply tempered air under the dictates of return air temperature sensors at the rear of each indoor unit. A 5 metre coiled control cable is provided at each indoor unit to allow the tenant to extend the space control to a wall mounted temperature sensor if required. Linear diffusers and associated pre-insulated plenums are installed around the perimeter of each floor with swirl type ceiling diffusers located within the internal ceiling grid. The indoor units are connected to the new plenums/diffusers with thermally insulated rigid sheet metal ductwork, complete with volume control dampers. The final connection to the diffuser plenum comprises a straight pre-insulated flexible duct, which is no more than 500mm long. Return air is drawn into the ceiling void via a combination of return air sections in the linear diffusers and air handling luminaires. Plant and riser space is provided for each office tenant to install any future condensers needed for a server room or to increase their system capacity to 100W/m² of small power cooling allowance in the case of a trading operation on one floor. Dedicated and labelled trays for the future pipework installation are provided in the two main risers. The toilets on each floor are provided with domestic hot water via an unvented storage cylinder served by a VRF heat pump boiler, connected to the office floor VRF system slave BC controller. prime mayfair office development 33 davies street 29

30 Building Services Outline Specification Mechanical Services, cont d Controls Services Description Ventilation Each office space is provided with a dedicated mechanical fresh air supply and extract system with heat recovery. The fan located above the ceiling in the toilet core comprises fan sections, motorised shut off dampers, an electric heater battery and filter banks. The fan is connected to intake and discharge louvres in the back façade by means of thermally insulated ductwork. Fresh air is heated to a temperature of 14 C and distributed from the fan through galvanised sheet steel ductwork to the back of the indoor units. Air is extracted from the occupied space by using the ceiling void as a return air plenum via air handling luminaires and dummy sections in the linear diffusers located within the suspended ceiling. Silencers are provided on the intake and discharge ductwork to both fan sections. The silencers comply with the requirements of the acoustic consultant s specification. Ductwork between the fans and the louvres is acoustically lined. Mechanical toilet extract ventilation is provided for the landlord s toilets and showers/changing room using a dedicated twin fan. Extract from each toilet/shower is achieved by way of circular extract valves in the ceiling connected to a ductwork riser. The riser collect the toilet extract air from the different floors and connect to the fan located inside the north enclosure at roof level. The toilet extract fan is controlled under the dictates of a time clock through the BMS. Power to the fan is provided from a landlord s distribution board. Silencers is provided on the intake and discharge ductwork to the toilet extract fan. Make-up air is provided from the adjacent office spaces ceiling void via transfer ducts complete with cross talk attenuators. The transfer ducts connect to supply grilles located in the toilet ceiling. Supply air to the changing room in the basement is provided by means of the fresh air supply fan located in the back of house corridor serving the basement areas. At the central plant the air is heated to a temperature of 18 C. The refuse and plant room areas are provided with dedicated extract fans located within the spaces and discharging to the outside via an extract louvre located in the first floor lightwell. Silencers are provided on the intake and discharge ductwork to each of the above supply and extract fans. The silencers comply with the requirements of the acoustic consultant s specification. Control of the building systems is provided by a direct digital control (DDC) system, including a head end management station, network controllers and DDC units. All control algorithms, computation and energy management functions is software-based and resident in the DDC system. The operator has the capability through the head end or network controllers to access all programs, display all data resident in the system memory and perform analogue and digital functions. All fans, pumps and other similar drives is variable speed drives. Simultaneous enabling of drives is prevented by a sequential start program in the DDC system. This program also provides sequential restart after failure of drives that were running prior to power failure or fire alarm shutdown. Software time delay relays is provided in the DDC system to allow fan motors to cool down before restarting. Motors have both a minimum interval time (between consecutive starts) and a minimum off time (between start and stop). The time periods is based on the motor rating. In the event of a fire alarm condition the BMS receives a signal from the fire alarm system which shuts down all HVAC systems. Automatic restart of fans after a fire alarm or power failure shutdown is software prohibited through the de-energisation of the remote start/stop contact. Fan restart is manually initiated by the operator either locally or remotely through the head end. prime mayfair office development 33 davies street 30

31 Building Services Outline Specification Controls Services, cont d Electrical Services Description A Trend IQ3 building management system (BMS) is installed. The BMS consists of Trend IQ3 web enabled outstations for the landlord s plant and each tenanted area. The outstations is networked together with a dedicated TCP/IP BMS network. A Trend 963 head end supervisor is installed in the main reception. This acts as a central point of integration for the landlord s and tenants plant and colour graphics is provided for each item of plant. All alarms is sent to the BMS head end. On the office floors, a Trend IQ3/XNC web enabled outstation is provided for each tenanted space. A dedicated control panel is provided in each tenant s riser to control/monitor the primary ventilation system, the VRF heating/cooling system and the electrical metering. Each control panel/outstation also has 25% spare capacity to enable the incoming tenant to add his own services such as comms room cooling equipment etc. Each control panel comprises a Mitsubishi AG150 LCD touch screen intelligent controller and power supply, a Trend IQ3/XNC outstation and power isolation. Each control panel has 20m of coiled control cabling and a stainless steel cover plate with an audible and visual alarm. If required, the cover plate is extended by the tenant to his reception desk to notify of a common alarm from the Trend IQ3/XNC controller. Each control panel also has a facia mounted plant extension button allowing the tenant to extend the operation of the VRF and ventilation systems for a further two hours after normal operation. Each time the button is pressed the systems operate for a two hour period even if pressed midway through a previous operation. A fire alarm interface is provided adjacent to each control panel. On receipt of a fire signal the plant is shutdown. The web enabled facilities on the AG150 controllers and Trend IQ3/XNC outstations provide the tenants with a facility to web browse their plant via a TCP/IP connection should they wish to as part of their fit-out plans. Should a tenant occupy more than one floor, he is able to web browse all controllers/outstations from a central point or consider a central PC to monitor the systems. All tenants IQ3/XNC controllers is linked to the head end located at the reception desk on the ground floor. This allows the building manager to monitor and control all features of the tenants plant and display colour graphics for each item of the plant. Incoming Electrical Services A new substation is provided at basement level of the south building elevation, in line with UKPN design considerations and requirements. The new incoming supply will service landlords and tenants Low Voltage (LV) switchgear to distribute to lighting, small power, mechanical plant, lifts and associated systems. The landlord switchgear comprises a main form 4 type 5 method of construction LV switchboard, located within a dedicated landlord switch room at basement level. The landlord s switchboard is provided with space allocation for automatic change over arrangements for the incoming services. Provision of the changeover arrangements, associated controls, wiring and connections shall be by the tenant s fit-out team. prime mayfair office development 33 davies street 31

32 Building Services Outline Specification Electrical Services, cont d Sub-Main Electrical Distribution The main distribution arrangements originate from the dedicated landlord main Low Voltage main switch board. Spare ways are provided to allow for future flexibility. Power factor correction is be provided on a distributed basis with each piece of plant provided with suitably sized correction capacitance. Additional power factor correction is provided on a bulk basis together with surge suppression as part of the landlord main switchboard arrangements. Space provision has been made at roof level for future tenant plant. In addition, space provision is provided through the distribution system to allow for associated future cabling. The electrical distribution system comprises sub-main boards for landlord s distribution of final sub circuits. Landlord distribution boards are located within landlord accessible areas only. Motor control is arranged on a distributed basis, negating the requirement for large motor control centres. A system of rising cable mains within each tenant electrical riser is provided, allowing single tenancy occupation across each office floor. Rising cable mains have been provided, suitably sized, for the connection of tenant composite distribution panels within each tenancy demise. Each tenant floor service is independently utility meter operated. The utility meters are located centrally within the main landlord LV switch room at basement level. Each tenant s demise is provided with a composite lighting and small power distribution panel to serve the tenant s on floor electrical requirements. The panel is located within the risers at each floor and incorporates electrical energy (electronic) multi-meters. The metering arrangements are provided with pulsed output terminals for central meter reading via the BMS. The building electrical energy metering and monitoring systems are provided in a manner compliant with the requirements of Building Regulations Part L A dedicated earthing distribution system is provided to meet BS7671, with additional tenant riser earth bars for tenant services. A lightning protection system is provided comprising roof earth termination network and utilising the internal building structure for down paths and finally terminating at basement earth rods. No tenant specific under floor small power provision is provided as part of the base building works. Raised access flooring is provided as part of the architectural package of works and allows a clear void for future tenant power distribution requirements. The voids are maintained clear of all other landlord services to ensure maximum tenant flexibility. The base building distribution network arrangements are suitably sized to allow capacity for anticipated future tenant small power arrangements based upon BCO recommendations. Local cleaner s sockets are provided at strategic points within the core and common areas, serviced from local landlord distribution boards. The landlord distribution boards also provide local power circuitry for toilet areas, and other miscellaneous services. Additional sockets are provided within the tenanted demise for cleaning purposes and supplied from the respective floor tenant distribution panels, these cleaners sockets are mounted flush within the raised floor utilising a cleaner s hive type arrangement to allow maximum flexibility to the tenant s Category B fit-out. High level power is provided within the tenant demise areas on each floor to serve the on floor mechanical systems and controllers. Each item of tenant mechanical plant is serviced from the composite tenant riser distribution panels, cabling is terminated locally within the ceiling void at a suitable isolation device. Ceiling void wiring arrangements comprise a prewired plug in distribution arrangement, providing maximum flexibility and speed to future tenant fit-out works and subsequent tenant alterations. The main building entrance hall is provided with a landlord distribution board which provides sub-circuitry to support local power, mechanical services, lighting and main reception desk facilities. Services to the reception desk incorporate strategic building control panels, reception lighting controls, over door heater controls and localised task lighting. prime mayfair office development 33 davies street 32