Hanson Building Products precast basement solutions
Hanson Building Products Basement Systems Add an extra dimension and combine the inherent flexible, structural and waterproof properties of concrete with the engineered quality of offsite production and make your basement precast. Hanson offer precast concrete basement solutions to suit the individual requirements of each development. Installation in just one day Pre-cast concrete means: Fast installation Smooth moulded surface finish requiring minimal decoration High load-bearing capacity Inherent fire resistance Thermal insulation properties Robust, durable and secure structures Excellent sound insulation Full or partial below ground designs Just in time delivery, saving expensive site time Greatly reduced weather dependency Complete bespoke solutions with staircase and all ancillary structural requirements
Box Basements Traditional masonry structures can be built straight off the top Box clever and take it all in pre-formed units. Ideal in basic form for below ground garage, store room, wine cellar etc. Up-grade to habitable room standard and provide a play room, games room or gym etc. Maximises the development potential of sloping sites by providing underfloor space without the need for constructing separate retaining walls. Units supplied in a wide variety of dimensions up to 6m wide by 3m high and to any length in maximum multiples of 2m. Structure comes complete with preformed end walls as required. Units can also be supplied complete with openings for windows, doors, ventilation shafts, services and stairways. The reinforced concrete units are designed to enable a traditional masonry structure above to be built straight off the top. Units can be installed without the need for major foundation works, (depending upon ground conditions and ultimate load to be applied). Ex mould finish to wall faces gives ideal base for minimal decoration. Maximises potential of sloping sites Installation can be complete in 1 day using mobile crane to place units on to a pre-prepared base. Installation is much less weather dependent than traditional methods.
Hanson Building Products Complete with floor, window and door openings Twin wall panels - two slabs connected by means of cast-in lattice girders Hanson precast staircase Installation rates of up to 100m 2 per hour
TwinWall Fully flexible walling system providing the speed and quality of pre-cast concrete with the structural and waterproof integrity of a continuously poured in situ concrete structure. No restriction on architectural layout Fast to build with installation rates of up to 100m 2 per hour Expensive formwork eliminated No waiting time for removal of formwork No edge shutter required for pouring of upper floor concrete Plastering to ceiling not necessary due to high quality finish Superior sound insulation Cable ducts and electrical boxes can be cast-in at factory Complete with floor, window, door and ventilation openings Cast in service ports can be provided Machine manufactured to exacting tolerances Less transport and crane costs due to less weight transported Full computer design with detailed installation drawing, calculations and method statement supplied.
Hanson Building Products Method Statement TwinWall When using Hanson ceiling panels, the outer-wall element will be increased in height by thickness of the ceiling panel. The inside wall element provides support. There is no requirement for shuttering to the ceiling edges. Wall and ceiling can be concreted in one work cycle. The delivery to the site is via flat bed trailers. A tower or mobile crane as well as a team of 3 people must be available on-site for unloading, positioning and installing. Perimeter Beam > 50mm Prior to installation Bars connecting wall to floor Omnidec floor panel Cover to suit exposure & fire requirements Cast-in fixing Starter bars Water bar Spacers Push-pull prop Basement slab 2 M12 fixings (typical) The slab must be as even as possible with an exactness of +/- 10mm and made of waterproof C25 concrete. If any connection reinforcement is necessary, it must be positioned 70mm to the outside edge of the wall. Any additional reinforcement for the wall installation must be connected at the lower end of the connection reinforcement. Any ground water build-up should be resolved with suitable drainage measures. Additional measures for sealing against water pressure must be taken. The layout of the walls is to be prepared on the slab by means of a levelling line. The length of each wall element should be marked and the required joint of 10mm considered in accordance with the installation drawing. The numbered positions should be marked to simplify the installation. During production of twin wall panels, a 30mm horizontal joint is taken into account. Packing shims levelled at the requested height further support the installation. 4 no shims per wall panel are to be prepared,approx. 500mm away from the ends. The shims must be flush with the outside of the wall panel after installation. Any necessary measures for sealing the joint between slab and wall panel are to be professionally executed (e.g. joint tape). Unloading A tower or mobile crane is necessary to unload the twin walls. Crane availability and all Health & Safety compliance are the responsibility of the client or his appointed site manager. Sufficient height must be available for the delivery vehicle. The unloading area for the delivery vehicle and crane must be adequate in area and load-bearing capacity. Acceptable unevenness of the floor is approx. 250mm on a length of 6,000mm. Unloading of the delivery vehicles and installation of wall panels needs to be executed by experienced site personnel. A team of 3 people is normally required. Twin wall elements are normally delivered in the upright position. Should this not be the case it is the contractors responsibility to safely and correctly turn the units. The crane chains must be of sufficient length to achieve an angle of at least 60 degrees when lifting the wall panel after fixing the hooks. Before lifting one element, the remaining panels on the lorry must be secured against tipping over. Additional protection is necessary for lattice girders reduced in size and for very high wall elements. Lifting into the vertical position must be executed without causing any sudden movement. Installation Hanson twin wall elements are marked with the position numbers shown on the installation drawing. They should be positioned in line according to the layout marking on the prepared shims. A vertical installation joint of 10mm should be allowed.
They require 2 no adjustable steel angled supports with spindles for fixing and positioning. Props should be screwed in the upper third of the inside wall element and to the slab by means of rawl plugs and pads. After positioning in line and fixing the crane chains can be removed. If necessary install additional reinforcement such as corner or joint connection reinforcement, wall and ceiling connection reinforcement as well as channels before the installation of further wall panels. Cut off any projecting installation bars at the ends of the wall panels before placing onto slab. For openings in joint areas, install reinforcement for the side, if required, before the neighbouring element is positioned. Openings, corners and T-shaped wall connections should be prepared with adequate measures. In case of unevenness in the floor, floor joint >30mm, a mould modification will be required. Vertical joints <10mm can be closed with installation foam. Attention: Please avoid any installation foam reaching the concrete core. Ceiling panel installation A detailed installation drawing will be prepared. When all wall panels and inside walls are installed, cross beams must be positioned as installation support for the ceiling panels in accordance with the installation drawing. After installing the ceiling panels, prepare shuttering for any ceiling openings and install pipework and conduit for the electrical installation as well as all supplementary and cross reinforcement. Pouring concrete Walls and ceilings can be concreted in one working cycle. (Please do not forget pre-watering.). A maximum 750mm wall pour height per hour is allowed. In order to prevent accumulation of aggregate and in order to achieve sufficient adhesion between in-situ concrete and wall panels, the concrete must be thoroughly vibrated. All reinforcement should be monitored during pouring of concrete. Any additional load or movement must be avoided before curing of the in-situ concrete in order to allow concrete and prefabricated panels to join together. Remove installation support. Sealing of basement outside walls Basement outside walls are to be sealed against moisture, seeping water and ground water. Ground water or flooding endangered areas Hanson twin wall elements are suitable for building in wet ground or in areas in danger of flooding. Please contact us for advice Once concreted a modular construction unit is achieved with excellent structural qualities. The installation of the wall and ceiling elements can be executed within one working day without any interruption. Concrete for wall elements and ceiling can be poured in one working cycle. Hanson offers a full installation service using experienced personnel together with a comprehensive range of additional structural components. For technical enquiries concerning basements please call our Somercotes office on 01773 602432
Floors and Precast Division 0870 6097094 Hanson Building Products Head Office Stewartby Bedford MK43 9L2 Tel: 08705 258258 Website: www.hanson.biz