SECTION 02722
PRECAST REINFORCED CONCRETE
STORM MANHOLES AND CATCH BASINS
PART 1.00 GENERAL
1.01 DECRIPTION
A. Work included:
The Contractor shall furnish all labor, materials, equipment, and incidentals required and install all precast concrete units including tops in accordance with the Drawings and these Specifications.
1.02 RELATED WORK
A. Unit Masonry
B. Miscellaneous Materials
C. Water Tight Joints
1.03 REFERENCES
A. American Society for Testing and Materials (ASTM):
1. ASTM A- 185 Steel Welded Wire Fabric for Concrete Reinforcement
2. ASTM C33 Concrete Aggregates
3. ASTM C39 Compressive Strength Cylinder Specimens
4. ASTM C478 Precast Reinforced Concrete Manhole Sections
5. ASTM C497 Testing of Manhole Sections
6. ASTM C990 Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants
B. American Association of State Highway and Transportation Officials (AASHTO):
1. AASHTO M55- Steel Welded Wire Fabric for Concrete Reinforcement
2. AASHTO M199 Precast Reinforced Concrete Manhole Sections
3. AASHTO M198 Joints for Concrete Pipe, Manholes and Precast Box Sections Using Preformed Flexible Joint Sealants
4. AASHTO 122 Compressive Strength Cylinder Specimens
5. AASHTO 1280 Testing of Manhole Sections
C. Occupational Safety and Health Standards (OSHA):
1. OSHA 29 CFR 1910.27 Steps and Ladders
D. State of Connecticut Department of Transportation (CTDOT):
1. Form 815 and Supplements
1.04 SUBMITTALS
A. Shop Drawings: Submit shop drawings under provisions of Section 01340. Show pertinent dimensions, steel, and concrete strength
B. Quality Control Submittals: Submit manufacturers certification indicating compliance with specified performance and design requirements.
SECTION 02722 Page 1
top of pageC. Test Reports: Submit test reports for concrete strength under provisions of Section 01410.
1.05 DELIVERY. STORAGE. AND HANDLING
A. Comply with provisions of Section 01610.
B. Delivery of new product.
C. Store units in an upright position.
PART 2.00 - PRODUCTS
2.01 MANUFACTURERS
A. Precast Manholes: Connecticut Precast Corporation, Monroe, CT (203) 268-8688 or equivalent.
B. Manholes Frames and Covers: Campbell Foundry, North Haven, CT or equivalent.
C. Catch Basins: Connecticut Precast Corporation, Monroe, CT (203) 268-8688 or equivalent.
2.02 MATERIALS
A. Manhole Bases: Bases shall have a monolithic base slab with riser barrel conforming to ASTM C478, AASHTO M199, and designed for AASHTO H20 loading.
B. Manhole Risers: Riser sections shall have a minimum 5, wall for 48 diameter, 6 wall for 60 diameter, 7 wall for 72 diameter, 8 wall for 84 diameter, 9 wall for 96 diameter, 11, wall for 120 diameter, and 12 wall for 144 diameter and conform to ASTM C478 and AASHTO M199.
C. Manhole Top Slabs: Top Slabs shall have a minimum thickness of 8 and conform to ASTM C478 and designed for AASHTO H20 loading.
D. Manhole Steps: Manhole steps shall be 7~ diameter steel reinforced copolymer polypropylene conforming to ASTM C478, AASHTO M-199 and OSHA 29 CFR 1910.27. Steps shall be placed in vertical alignment in preformed holes as per step manufactures instructions. The steps shall resist a pullout force of over 1500 lbs. Eng lugs shall have a reflecting material insert.
E. Concrete: Concrete shall air entrained in accordance with CTDOT specifications and have a minimum concrete compressive strength of 4,000 PSI at 28 days. Concrete shall be placed in forms and vibrated in such a manner to make a dense uniform product.
F. Catch Basins: Catch Basin shall be of size as indicated on Drawings. Standard Catch Basin shall be as shown on CTDOT Specification Drawings 507H. The minimum wall thickness shall be six inches with a shiplap joint. All knockouts in riser walls shall be steel reinforced.
G. Catch Basin Tops: Catch Basin Tops shall be as indicated on Drawings. Concrete Tops shall be manufactured in accordance with CTDOT Form 815 Specifications and as manufactured by Connecticut Precast Corp. All Catch Basin Frames and Grates shall be galvanized steel or cast iron in accordance with the applicable requirements of Section M.06.03 of Form 815.
H. The Engineer prior to use shall approve Extension/adapter rings.
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PART 3.00 - EXECUTION
2.01 INSTALLATION
A. The manholes and catch basins shall be constructed according to the sizes shown on the Drawings and as specified herein. Install at elevations and locations on the Drawings or as otherwise directed by the Engineer.
B. Place the Precast base units on a granular sub base with a minimum thickness of six inches after compaction or of greater thickness and compaction if specified elsewhere. The granular sub base shall be check for level prior to setting.
C. Pipe openings shall be sealed by the Contractor with cement mortar and shall be sized to accept pipes of the specified size(s) and material(s).
D. After setting of precast base section, the joint shall be clean free of dirt or other unsuitable materials. A butyl joint sealant conforming to ASTM C990 shall be applied to the joint area and then the next precast section installed. Set all sections in plum. When setting sections ensure that the manhole steps are set in vertical alignment.
E. Plug holes, in the concrete sections made for handling with a non-shrink grout and/or the rubber plugs.
F. Install tops according the Drawings at finished grade. Adjust to grade with brick or masonry conforming to ASTM C32 or pre-approved precast grade rings.
2.02 FIELD TESTING
A. General: Provide all equipment and personnel necessary, and make all tests required to demonstrate that the work of this section has been completed in strict accordance with the design and the specified requirements.
B. Inspection: All units shall be inspected to be sound. There shall be no visible leakage through the walls or pipe connections.
C. Repair: Any defect found shall be repaired as approved by the Engineer. The repair method shall be of sound principle to ensure compliance with this specification.
END OF SECTION
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