853SANITARY SEWER PIPE, MANHOLES,

732

853.07Joint Materials for Pipe

Joint material shall provide a suitable waterproof joint capable of withstanding internal pressure of the system involved and be of an approved type. Thermally fused joints will be allowed if installed according to the pipe manufacturer’s recommendations.

853.08Manholes

Precast reinforced concrete manholes shall meet the requirements of ASTM C 478. The manhole shall consist of the base, riser, transition, and conical sections and shall have a minimal number of joints. The minimum nominal diameter of manholes shall be 48 inches {1220 mm} for pipe sizes less than 24 inches {600 mm}. The aggregate shall be calcareous rock. Concrete used to cast manholes shall comprised with Type I/II or Type II cement only. The cone shaped top section shall be either conical or eccentric as required by the project plans and specifications. The top section of manholes less than 6 feet {1.82 m} in depth shall be flat concrete slabs and shall conform to the requirements of ASTM C 478. Basis of acceptance for flat slab tops shall be either proof of design testing or rational design calculations as described in ASTM C 478 and shall be submitted to the Engineer for review. Both cone shaped top sections and flat slab tops shall be designed to withstand a minimum H-20 wheel loading in accordance with AASHTO requirements. A black mastic joint sealer as approved by the Engineer shall be placed on top of the cone section of the manhole before setting the castings to prevent infiltration. Manholes shall be supplied with pipe cutouts for all incoming and outgoing pipe. The pipe cutouts shall be fitted with flexible manhole pipe connectors (boots) that meet ASTM C 923 and as required by the Engineer. Cast iron frames and covers shall conform to the Plans in all essentials of design. All castings shall fit the manholes properly. All castings shall be made of clean, even grain, tough gray cast iron. The quality of iron in the castings shall conform to the current ASTM A 48 for Class 30 gray iron castings. Frames and covers shall weigh not less than that shown on the Plans. The castings shall be smooth, true to pattern and free from projections, sand holes or defects and shall properly fit the manhole opening. The portion of the frame and cover which forms the cover seal shall be machined so that no rocking of the cover is possible. The castings shall be coated with coal tar pitch varnish. The cover shall have non- penetrating pick holes. On paved streets, the frame and cover shall be set flush with and in the plane of the paved surface. Where shown on the plans or directed by the Engineer, sealed castings shall be of the bolted watertight manhole rings and covers and meet the above requirements. Manhole steps shall be steel rods encased in polypropylene plastic and shall be as approved by the Engineer. Steps may be Type PS-1 or PS-2. Steps shall conform to the requirements of ASTM C 478. Manhole steps shall be driven into the wet wall during manufacture to prevent each from working loose or pulling out. Manholes shall be constructed in the size, shape, and dimension as detailed in the Utilities Standard Drawings or on the plans.

853.09Crushed Stone Foundation for Pipe and Manholes

Crushed Stone shall be screened, washed and 100 percent shall be retained by a 1/4 inch {6 mm} sieve. Crushed stone shall have 100 percent passing a 1 inch {25 mm} sieve and shall be uniformly graded from maximum to minimum size. Foreign matter shall not exceed 3 percent by weight when dry.

853.10Air and Vacuum Valve

The air and vacuum valve for sanitary sewer shall permit unrestricted passage of air during filling of the force main and unrestricted entry of air during vacuum of the force main and rated for a minimum of 150 psi {1030 kPa}. The float shall be stainless steel. The valve shall not come into contact with the sewer. The valve shall have a National Pipe Thread (NTP) inlet and shall be fitted with back flushing device. The air and vacuum valve assembly shall be as detailed in the project plans and specifications. STORM SEWER PIPE 733

STORM SEWER PIPE

854.01Concrete (Storm) Sewer Pipe

Only plain concrete pipe 24 inches {610 mm} or less in diameter (or equivalent area in arch pipe) will be permitted. Circular pipe shall meet the requirements for Class 2 pipe of AASHTO M 86 or for Class II of AASHTO M 170 without steel reinforcement, provided the same strength requirements for the same size pipe provided in AASHTO M 86 for Class II pipe are met.

Circular pipe over 24 inches {610 mm} in diameter shall meet the requirements of AASHTO M 170 for Class II unless another class is designated by the plans or proposal. Arch pipe larger than 18 inch {455 mm} rise by 28.5 inch {725 mm} span shall meet the requirements of AASHTO M 206 for Class A-II unless another class is designated by the plans or proposal.

In addition to the above requirements, all precast products furnished must meet the requirements of Section 831, Precast Concrete Products.

854.02Coated, Smooth Lined Corrugated Metal (Storm) Sewer Pipe (CSLCM)

CSLCM shall meet the requirements of AASHTO M 36 or AASHTO M 196 for Type 1A pipe. The shell and liner shall be pre-coated on both sides with a 10 mil {0.25 mm} polymeric coating as per AASHTO M 246. For correlation purposes the following table provides acceptable shell and liner plate thickness which may be used to equate with Corrugated Metal Pipe (CM) wall thicknesses. Class of Pipe Equivalent Single Steel Sheet Wall Thickness S.L. Wall Thickness Shell Liner 1 0.064 inches {1.6 mm} 0.052 inches {1.3 mm} 0.04 inches {1.0 mm} 2 0.079 inches {2.0 mm} 0.052 inches {1.3 mm} 0.04 inches {1.0 mm} 3 0.109 inches {2.8 mm} 0.079 inches {2.0 mm} 0.04 inches {1.0 mm} 4 0.138 inches {3.5 mm} 0.109 inches {2.8 mm} 0.04 inches {1.0 mm} NOTE: For aluminum all thicknesses may be reduced by 0.004 inches {0.10 mm} to compensate for zinc coating. Connecting bands shall conform to the appropriate provisions of AASHTO M 36 or M 196 for the type material used and shall have the same type coating as used on the pipe. Appropriate designed waterproof gaskets shall be used in conjunction with connecting bands to form a watertight joint. Gasket material shall be neoprene or other approved material. Damage to coatings shall be repaired in accordance with the appropriate provisions of AASHTO M 245 for a polymeric coating.

854.03Coated Smooth Flow Corrugated Metal (Storm) Sewer Pipe (CSFCM)

CSFCM shall meet the applicable requirements of Article 850.02 or Article 850.03 and the following:  All pipes shall have a protective coating in accordance with the applicable provisions of Subarticle 850.02(c). In addition the inside of the pipe shall have a paved lining for the entire inside periphery which will fill the valleys to the extent that the thickness above the top of the crest of the corrugations will not be less than 1/8 inch {3 mm}. The lining shall be smooth and uniform and its surface shall be parallel to a line projected along the crest parallel to the centerline.  Bituminous coating and pavement lining shall conform to the requirements of AASHTO M 246 for Type B sheets with the pavement lining formed from material compatible with the coating material and otherwise meeting the same basic requirements of Section 5 of AASHTO M 190.  Connecting bands shall meet the requirements of Subarticle 850.02(d) and have appropriate waterproof seals in accordance with Article 846.02.  Damage to coating and pavement linings shall be repaired in accordance with the appropriate provisions of AASHTO M 245 for polymeric material and approved asphalt mastic as noted in AASHTO M 245.