The Guide Specifications in this catalog may be used as models for either office master specifications or specifications for particular projects.
In either case, the Guide Specifications must be edited to fit the conditions of use. Material is included that will not be suitable for every
purpose and should be deleted as necessary; other material will have to be added for specific projects. Blanks have been provided where appropriate
requirements should be added.
Structural Precast Concrete
PART 1 GENERAL ⇒ part 2 | part 3
- WORK INCLUDED:
Delete if all work to be included is indicated in drawings.
- RELATED WORK SPECIFIED ELSEWHERE:
Edit for project conditions. Revise section numbers if they differ from those used in the project manual.
- Shop drawings, products data, and samples. Section 01340.
- Cast-in-place concrete. Section 03300.
- Cast-in-place, post-tensioned concrete. Section 03365.
- Precast concrete Hollowcore slabs. Section 03411.
- Architectural precast concrete. Section 03450.
- Tilt-up concrete. Section 03470.
- Fabricated steel not cast into concrete. Section 05500.
- Waterproofing. Section 071____.
- Dampproofing. Section 071____.
- Sheet metal flashing. Section 07620.
- Sealants and caulking. Section 07920.
- Painting. Section 09900.
- WORK INSTALLED BUT FURNISHED BY OTHERS:
- Reglets to receive sheet metal flashing. Section 07620.
- Reglets to receive metal windows. Section 08500.
- Anchoring devices to receive equipment. Division 11.
- Dumbwaiter and elevator guides. Sections 14100 and 14200, respectively.
- Anchoring devices to receive mechanical and electrical work. Divisions 15 and 16, respectively.
1.02 QUALITY ASSURANCE
- APPROVED MANUFACTURERS:
Include one of the following manufacturer standards:
- Morse Bros, Incorporated
- Prestressed Concrete Group
- P.O. Box 181, Harrisburg, OR 97446
- The manufacturer shall be certified by the Prestressed Concrete Institute.
- The erector shall have been regularly engaged for at least________ years in erection of precast structural concrete similar to that required by this project. (Usually 2-5 years)
- The welder shall be certified by the American Welding Society in accordance with AWS D1.1 for welds to be encountered on this project.
- Maximum age of certificate: 1 year.
REQUIREMENTS OF REGULATORY AGENCIES:
- Unless otherwise specified herein, comply with requirements specified in MNL-116,
Manual for Quality Control for Plants and Production of Prestressed Concrete Products, published by the Prestressed Concrete Institute.
Copies may be obtained from the Institute at 209 W. Jackson Blvd. Ste 500, Chicago, IL 60606, (312) 786-0300.
- Follow local building code requirements if they are more stringent than the requirements in these specifications. Notify the architect / engineer of differences prior to starting work.
- Comply with applicable provisions of the referenced standards (see 1.02.D above).
- Submit two samples of specified exposed surfaces, no less than 12 x 12 inches in size, showing texture and color,
final approval is based on 4’ x 4’ samples.
- PRODUCT DESIGN CRITERIA:
- Submit ________ copies of the following design loadings, in accordance with Section 01340:
- initial handling and erection stresses
- dead and live loads specified on the contract drawings
- other specified loads
- Design calculations of products not shown on the contract drawings shall be performed by an engineer experienced in precast, prestressed concrete design and registered in the state where the project in located. These calculations shall be submitted for approval upon request.
- The design shall comply with applicable ACI 318 requirements.
- Design deviations will be permitted only with the written approval of the architect / engineer, and any such deviations shall provide for an installation equivalent to that originally intended, without additional cost to the owner. Requests for deviations shall be submitted with complete design calculations and drawings.
- SHOP DRAWINGS:
- Submit______ copies of shop drawings including the following information, in accordance with Section 01340:
- plans and / or elevations locating and defining all products to be furnished by the manufacturer.
- sections and details showing connections and cast-in items, and their relation to the structure
- descriptions of all loose, cast-in, and field hardware
- location drawings for field-installed anchors
- erection sequences and handling requirements
- dead, live, and other applicable design loads
Inclusion of the following information may add to the contract summand should be required only if necessary:
- an elevation view of each member
- sections and details to indicate quantities and position of reinforcing steel, anchors, inserts, etc.
- lifting and erection inserts
- dimensions and finishes
- prestress force and concrete strengths
- estimated cambers
- transportation methods
- MANUFACTURER’S INSTRUCTIONS:
- Prior to product delivery to the jobsite, submit handling and erection instructions to the general contractor, with a copy to the architect / engineer.
- TEST REPORTS:
- Submit one copy of each required test report to the general contractor.
1.04 PRODUCT DELIVERY, STORAGE, AND HANDLING
- Comply with contractor’s erection sequence schedule.
- STORAGE AND HANDLING:
- Protect members against damage, distortion, and discoloration.
- Store members off the ground.
- Place stored members so that identification marks are discernible.
- Do not handle until stresses are released. If stress release is not performed in a continuous operation, do not handle the members until
they are sufficiently stressed to sustain handling forces.
- Store product as required by precast manufacturer.
- Lift and support near member ends, unless otherwise approved.
- Storage area shall be stable and provided with foundations that will prevent differential settlement or twisting of members.
- Separate and support stacked members with battens placed across the full width of the bearing points.
- Locate battens no father from the designated lifting points than a distance equal to the depth of the member.
- When stacking stemmed members, do not extend battens continuously over more than on stack.
- Keep lifting devices accessible and undamaged.
- Do not store shorter members or heavy equipment on upper members of a stacked tier.
1.05 JOB CONDITIONS
- SEVERE WEATHER PRECAUTIONS:
- Comply with requirements specified in referenced standards (see 1.02.D above).
- Coordinate through the general contractor with other trades affecting or affected by work of this Section.
- Protect other work against damage and discoloration caused by work of the Section.
1.06 FIELD MEASUREMENTS
- PRIOR TO FABRICATION:
- The general contractor shall verify and submit field measurements to the fabricator prior to fabrication in a timely manner.
- MEASUREMENT DISCREPANCIES:
- If field measurements differ slightly from drawing dimensions, modify the work as required for an accurate fit.
If measurements differ substantially, notify the architect / engineer in a timely manner prior to the fabrication.
⇒ Section 03410 part 2 | part 3