SECTION 33 05 16.13 PRECAST CONCRETE PART 1 - GENERAL 1.01 SECTION INCLUDES A. This item shall consist of the construction of both sanitary and storm sewer precast concrete manholes in accordance with these specifications, at the specified location and conforming to the lines, grades, and dimensions shown on the plans or required by the Construction Manager. B. Appurtenances 1.02 RELATED SECTIONS A. Section 013523.13 - Project Safety Requirements B. Section 013301 Submittals C. Section 014516 Field Quality Control Procedures D. Section 312316 Excavation E. Section 312333 Trenching and Backfilling F. Section 321123 Aggregate Base Courses G. Section 312319 Dewatering 1.03 REFERENCES A. ASTM A185 - Steel Welded Wire Fabric for Concrete Reinforcement B. ASTM C33 - Concrete Aggregates C. B. ASTM C39 Compressive Strength Cylinder Specimens D. ASTM C478 Precast Reinforced Concrete Manhole Sections E. ASTM C497 Testing of Manhole Sections 330516.13-1 PRECAST CONCRETE
F. ASTM C990 Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants G. ASTM C 1244 Standard Test Method for Concrete Sewer Manholes by the Negative Air Pressure (Vacuum) Test H. AASHTO M55- Steel Welded Wire Fabric for Concrete Reinforcement I. AASHTO M199 Precast Reinforced Concrete Manhole Sections J. AASHTO M198 Joints for Concrete Pipe, Manholes and Precast Box Sections Using Preformed Flexible Joint Sealants K. Standard Construction Specification for Sewers and Drainage Facilities 2000 by the Metropolitan St. Louis Sewer District 1.04 SUBMITTALS A. Refer to Section 01 33 01 - Submittals. B. Quality Control Submittals: Submit manufacturers certification indicating compliance with specified performance and design requirements. 1.05 SUBMITTALS FOR CONTRACT CLOSEOUT A. In accordance with Section 01 77 19 - Contract Closeout and Section 01 78 01 - Warranties and Bonds, Procedures for submittals. B. Manufacturer's Certificate: Certify that products meet or exceed specified requirements. C. Record actual locations of the manhole and the invert elevations. D. Identify and describe unexpected variations to subsoil conditions or discovery of uncharted utilities. 1.06 QUALITY ASSURANCE A. Perform all work in accordance with referenced standards, Section 01 45 16 Quality Control 1.07 DELIVERY, STORAGE, AND HANDLING A. Deliver, store, protect and handle products to site under provisions of Section 01 35 02 - Material and Equipment. 330516.13-2 PRECAST CONCRETE
B. Store units in an upright position. PART 2 - PRODUCTS 2.01 MANUFACTURERS A. Precast Manholes: Klueter Brothers, Edwardsville, IL (618) 656 2581 or approved equivalent. B. Manholes Frames and Covers: Neenah Foundry or approved 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 HS-20 loading. B. Manhole Risers: Riser sections shall have a minimum 4.5" wall for 42" diameter and conform to ASTM C478 and AASHTO M199. C. Manhole Top Slabs: Top Slabs (if required) shall have a minimum thickness of 8" and conform to ASTM C478 and designed for AASHTO HS- 20 loading. D. Manhole Steps: Manhole steps shall be 1 /2" 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. The steps shall not exceed spacing greater than 16" on center. E. Concrete: Concrete shall be air entrained in accordance with IDOT 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. Coating: Exterior surfaces of manholes shall have two coats of an approved asphalt coating applied according to manufactures recommendations. An alternate to the exterior coating shall be a concrete admixture that is applied to the concrete with batching and demonstrates a reduction in water absorption below five percent. G. Pipe Connections: Pipes shall be connected to the manhole walls using an approved flexible sleeve. Approved connections shall be A-Lok 330516.13-3 PRECAST CONCRETE
or ZLok by A-Lok Products, or approved equal conforming to ASTM C990. H. Joint Sealant: Joint sealant shall be an approved butyl rubber conforming to ASTM C478 and ASTM C990. PART 3 - EXECUTION 3.01 REJECTION A. Precast units shall be subject to rejection for failure to conform to any of the specified requirements. In addition, individual sections may be rejected because of any of the following: 1. Fractures or cracks passing through the wall, except for a single end crack that does not exceed the depth of the joint. 2. Defects that indicate imperfect proportioning, mixing, and molding. 3. Surface defects indicating honeycombed or open texture. 4. Damaged or cracked ends where such damage would prevent making a satisfactory joint. 5. Any continuous crack having a surface width of 0.01 inch (0.3 mm) or more and extending a length of 12 inches (300 mm) or more, regardless of position in the section wall. 3.02 INSTALLATION A. Place the Precast base units on an aggregate base course with a minimum thickness of eight inches after compaction. The granular sub base shall be checked for level prior to setting. B. 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. After two sections are joined together. The interior and exterior of the joints shall be grouted. C. Joining Pipe to Manholes: If manhole base sections are equipped with flexible sleeves, slide pipe through sleeve until the end of the pipe is flush with the inside wall of manhole. Install and secure sleeve to pipe 330516.13-4 PRECAST CONCRETE
with stainless steel clamp is required. If flexible sleeve is a compression type, such as A-Lok type, no external stainless steel clamp is required. D. Plug holes, in the concrete sections made for handling with a non-shrink grout and/or the rubber plugs. 3.03 FIELD TESTING A. Refer to the Standard Construction Specification for Sewers and Drainage Facilities, 2000, by the Metropolitan St. Louis Sewer District and the following specifications, whichever gives the greatest effect. B. Inspection: All units shall be inspected to be sound. There shall be no visible leakage through the walls or pipe connections. C. Testing: Testing on Sanitary Precast Concrete Manholes shall be by Vacuum Testing in accordance with ASTM C 1244. All vacuum testing shall be performed prior to backfilling of manhole. The test procedure shall be as follows: 1. Plug, seal, and brace all pipes entering the manhole to prevent them from dislodging during the test. Pipe plugs shall be installed beyond boot seals. 2. Firmly secure vacuum testing equipment to manhole as per recommendations. 3. Start vacuum and seal and necessary leaks around the testing equipment bladder. 4. Attain a vacuum of 10" Hg. 5. Time pressure drop to 9" Hg. Record time. If time to drop 1" Hg is less than 1 minute, manhole shall be passed. If manhole does not pass, the Contractor shall locate leak(s) and repair and retest until satisfactory. 6. Release Vacuum and backfill manhole in accordance with specifications herein. D. Repair: Any defect found shall be repaired as approved by the Construction Manager. The repair method shall be of sound principle to ensure compliance with this specification. END OF SECTION 33 05 16.13 330516.13-5 PRECAST CONCRETE