SPECIFICATIONS for DYNASPAN PRECAST CONCRETE- HOLLOW CORE SLABS

Transcription

1 SPECIFICATIONS for DYNASPAN PRECAST CONCRETE- HOLLOW CORE SLABS 1. Specifications and Qualification of New York Precast or Equal 1.1 Qualifications of New York Precast or Equal New York Precast (or equal) may be requested to list similar and comparable work successfully completed by them and adequacy of plant capability and facilities for performance of contract requirements. Standards of performance are given in the PCI quality control manual MNL 116. a. Manufacturer: The manufacturer shall be New York Precast or an equal, having a proven background of experience and record of performance required for this project. b. Requirements of Regulatory Agencies: Design, construction and installation shall meet requirements of state and local building codes. c. Allowable Tolerances: a. Length of precast units shall be +/- _ inch of the length indicated on the approved shop drawing. b. Width of precast concrete units: +/- _ inch. c. Thickness of precast concrete units: +/- _ inch. d. Location of inserts: +/- 1 inch. e. Differential camber between adjacent units of the same design: +/- _ inch per 10 ft., but not greater than _ inch. f. Squareness of ends (vertical and horizontal alignment): +/- _ inch. d. Source Quality Control: Cylinder test of concrete quality shall be made by the manufacturer in accordance with ASTM C 192, for each design, for each day of production, or for each 100 cubic yards of concrete. 1

2 2. Contract Documents and Design Responsibility 2.1 Contract Documents Prior to initiation of the engineering-drafting function, New York Precast should have the following documents at their disposal: 1. Architectural drawings. 2. Structural drawings. 3. Electrical, mechanical and plumbing drawings (if pertinent.) 4. Specifications (complete with addenda.) Other pertinent drawings may also be desirable, such as shop drawings from other trades, roofing requirements, alternates, etc. 2.2 Design Responsibilities It is the responsibility of the owner or his representative to keep the manufacturer supplied with the up-to date documents and written information. New York Precast should not be held responsible for problems arising from the use of outdated or obsolete contract documents. If updated documents are furnished, it may also be necessary to modify the contract. 3. Erection and Production Drawings 3.1 Erection Drawings The information provided in the contract documents is used by New York Precast to prepare erection drawings for approval and field use. They contain: 1. Plans and/or elevations locating and dimensioning all members furnished by New York Precast. 2. Sections and details showing connections, finishes and openings and their relationship to the structure. 3. Description of all loose hardware including designation of who furnishes it. 4. Drawings showing location of anchors installed in the field. 5. Erection sequences and handling requirements. 3.2 Discrepancies When discrepancies or omissions occur on the contract documents, New York Precast has the responsibility to check with the engineer to resolve the problem. If this is not possible, the following procedures are normally followed: 1. Contract terms govern over specifications and drawings. 2

3 2. Specifications govern over drawings. 3.2 Discrepancies (Continued): 3. Structural drawings govern over architectural drawings. 4. Written dimensions govern over scale dimensions. 5. Sections govern over plans or elevations. 6. Details govern over sections. Graphic verification should be requested for any unclear condition. 3.3 Approvals Completed erection drawings should be submitted for approval. The exact sequence is dictated by construction schedules and erection sequences, and, is determined when the contract is awarded. Production should not be started prior to receipt of approved or approved-as-noted erection drawings. Corrections should be noted on the erection drawings and copies made for distribution. The following approval interpretation is normal practice: 1. Approved- The approvers have completely checked and verified the drawings for conformance with contract documents and all expected loading conditions. Such approval should not relieve New York Precast from responsibility for their design when that responsibility is placed upon them by contract. New York Precast may then proceed with the production without resubmittal. Erection drawings may then be released for field use and plant use. 2. Approved as noted- Same as above except that noted changes should be made and corrected erection drawings issued. Production may be started after noted changes have been made. 3. Not approved- Drawing must be corrected and resubmitted. Production should not be started until approved or approved as noted erection drawings are returned. 4. Tests and Inspections 4.1 Tests of Materials New York Precast generally keeps the test records required by the PCI manual for quality control (MNL-116.) The contract documents may require New York Precast to make these records available for inspection by the owner s representative upon his request. When New York Precast is required to submit copies of test reports to the owner and/or required to perform or have performed tests not required by MNL-116, these 3

4 special testing requirements should be clearly described in the contract documents along with the responsibility for payment. 4.2 Inspections On certain projects the owner may be require inspection of Dynaspan products in New York Precast s yard by persons other than New York Precast s own quality control personnel. Such inspections are normally made at the owner s expense. The contract documents should describe how, when and by whom the inspections are to be made, and who is to pay for them. 4.3 Fire Rated Products If New York Precast is expected to provide a fire rated product and/or labels, these requirements should be clearly stated in the contract documents. 5. Delivery Materials 5.1 Manner of Delivery New York Precast should deliver the precast concrete to the erector in a manner to facilitate the speed of erection of the building or as mutually agreed upon between the owner, New York Precast and erector. Special requirements of the owner for the delivery of materials or the mode of transport, should be stated in the contract documents. 5.2 Marking and Shipping of Materials The Dynaspan members shall be separately marked in accordance with erection drawings in such a manner as to distinguish varying pieces and to facilitate erection of the structure. Any members which require a sequential erection will be properly marked. 5.3 Precautions During Delivery Special protection or precautions beyond that required in MNL-116 should not be expected unless stated in the bid invitation or specifications. New York Precast is not responsible for the product after delivery to the site unless required by the contract documents. 6. Erection 6.1 Special Erection Requirements When the owner requires a particular method or sequence of erection, this information should be stated in the contract documents. 4

5 6.2 Tolerances Some variation is to be expected in the overall dimensions of any building or other structure. It is common practice for New York Precast and the erector to work within the tolerances recommended by the American Concrete Institute and Prestressed Concrete Institute. The owner, by whatever agencies he may elect, immediately upon completion of the erection, should determine if the work is plumb, level, aligned and properly fastened. Discrepancies should immediately be brought to the attention of the erector so that proper corrective action can be taken. The work of New York Precast or erector is complete once the building has been properly plumbed, leveled and aligned within the established tolerances. Acceptance for this work should be secured from the authorized representative of the general contractor. 6.3 Tie Bars, Plates, Etc. New York Precast does not normally furnish or install tie bars, plates, etc. that are to be installed in cast-in-place concrete or masonry for the connection with Dynaspan members. It is important that such items be installed true to line and grade, and that installation be completed in time to avoid delays or interference with the Dynaspan erection. Erectors should check both line and grade in sufficient time before erection is scheduled to permit any necessary corrections. Corrections, if any, should be made by the general contractor before erection begins. 6.4 Utilities Water and electricity should be furnished for erection and grouting operation by the General Contractor. 6.5 Working Space The General Contractor should furnish adequate, well drained, convenient working space for the erector and access for his equipment necessary to assemble the structure. The owner should provide adequate storage space for the precast products to enable the erector to operate at the speed required to meet the established schedule such as high voltage lines, buried utilities, or areas or restricted access should be declared in the invitation to bid. 6.6 Materials of Other Trades 5

6 Other building materials or work trades preferably should not be built above the bearing of the Dynaspan slab until after erection of the precast. 6.7 Correction of Errors Corrections of minor misfits are considered a part of erection even if the precast concrete is not erected by New York Precast. Any error in manufacturing which prevents proper connection or fitting should be immediately reported to New York Precast and the engineer and/or owner so that corrective action can be taken. 6.8 Holes, Cuts and Alterations Neither New York Precast nor the erector is responsible for the holes, cuts and alterations 8 in diameter or square or less for other trades. All information regarding size, location and number of alterations is furnished by the owner prior to preparation of the Dynaspan erection drawings. The general contractor is responsible for warning other trades against indiscriminate cutting of prestressed concrete members. 6.9 Temporary Floors and Access New York Precast or erector is not required to furnish temporary flooring for access unless so specified in the contract documents Painting, Grouting, Caulking and Closure Panels Painting, grouting, caulking are services not ordinarily supplied by New York Precast or erector Patching A certain amount of patching product is to be expected to repair minor spalls and chips. Required patching should meet the finish requirements of the project and color should be reasonably matched. Responsibility for accomplishing this work should be resolved between New York Precast and erector Safety Safety procedures for the erection of the precast concrete members is the responsibility of the erector and must be in accordance with all local, state and federal rules and regulations which have jurisdiction in the area where the work is to be performed, but not less than required in ANSI Standard 10.9, American National Standard Safety Requirements for Concrete Construction and Masonry Work Security Measures 6

7 Security protection at the job site should be the responsibility of the general contractor. 7. Interface with Other Trades Coordination of the requirements for other trades to be included in the precast should be the responsibility of the owner. The PCI manual for quality control (MNL-116) specify manufacturing tolerances for materials and trades must take these tolerances into account. Unusual requirements or allowances for interfacing should be stated in the contract documents. 8. Products 8.01 Materials A. Portland Cement: a. ASTM C150- Type I or III. B. Admixtures: a. Air-Entraining Admixtures: ASTM C260. b. Water Reducing, Retarding, Accelerating Admixtures: ASTM C494. C. Aggregates: a. ASTM C33 or C330. D. Water: Potable or free from foreign materials in amounts harmful to concrete and embedded steel. E. Strand: a. Uncoated 4, 6 or 8 Wire, Stress-Relieved Strand: ASTM A416- Grade 250K or 270K. F. Grout: a. Cement grout: 1 part Portland cement, 3 parts sand, and water. G. Bearing Pads: a. 1/8 x 2 Korolath Concrete Mixes A. New York Precast, Kingston, NY. (845) (or equal). B. Manufacturing procedures shall be in general compliance with PCI MNL-116. C. Manufacturing Tolerances shall be in compliance with MNL-116. D. Finishes: a. Standard Underside: Resulting from casting against steel forms using good industry practice in cleaning of forms, design of concrete mix, placing and 7

8 curing. Small surface holes caused by air bubbles, normal color variations, normal form joint marks and minor chips and spalls will be tolerated, but no major or unsightly imperfections, honeycomb, or other defects will be permitted Concrete Mixes (Continued): b. Standard Top: Result of rotary screed. Normal color variations, minor indentations, minor chips and spalls will be permitted. No major imperfections, honeycomb or defects will be permitted. c. Special Finish: If required, listed as follows: E. Openings: New York Precast shall provide for those openings 8 inches round or square or larger as shown on the structural drawings. Other openings shall be located and field drilled or cut by the trade requiring them after the precast prestressed approved by Architect/Engineer before drilling or cutting. F. Patching: Patching will be acceptable providing the structural adequacy of the product and the appearance are not impaired. 9. Execution 9.01 Product Delivery, Storage and Handling A. Delivery and Handling: a. Dynaspan concrete members shall be lifted and supported during manufacturing, stockpiling, transportation and erection operations only as recommended by New York Precast. All lifting devices shall have a minimum safety factor of 4. b. Transportation, site handling and erection shall be performed with acceptable equipment and methods, and by qualified personnel. B. Storage: a. Store all units off ground. b. Place stored units so that identification marks are discernible. c. Separate stacked members by battens across full width of each bearing point. d. Do not use upper member of stacked tier as storage area for shorter member of heavy equipment 9.02 Erection A. Site Access: The General Contractor shall be responsible for providing suitable access to the building and firm level bearing for hauling and erection equipment to operate under their own power. B. Preparation: The General Contractor shall be responsible for: 8

9 a. Providing true, level bearing surfaces on all field placed bearing walls and other field placed supporting members. b. Placement and accurate alignment of field placed supporting members Erection (Continued): C. Installation: Installation of precast prestressed concrete shall be performed by New York Precast or a competent erector. Members shall be lifted by means of suitable lifting devoices at points provided by New York Precast. Temporary shoring and bracing, if necessary, shall comply with New York Precast s recommendations. D. Alignment: Members shall be properly aligned and leveled as required by the approved shop drawings. Variations between adjacent members shall be reasonably leveled out by jacking, loading or other feasible method and acceptable to the Architect/Engineer Attachments A. Subject to approval of the Architect/Engineer, precast prestressed products may be drilled or shoy provided no contact is made with the prestressing steel. Should spalling occur, it shall be repaired by the trade doing the drilling or the shooting Inspection and Acceptance A. Final inspection and acceptance of erected Dynaspan precast prestressed concrete shall be made by Architect/Engineer to verify conformance with plans and specifications. 9