02450.00 1100 Section 02450 - Manhole and Inlet Materials Descriptions
02450.00 Scope - This Section includes the requirements for precast manhole sump sections, metal
frames, covers, grates , and manhole steps . Materials
02450.10 Precast Concrete Manhole Sections - Furnish precast risers, cones, and cover slabs for
precast concrete manholes conforming to the requirements of AASHTO M 199 ( ASTM C478).
02450.15 Precast Concrete Catch Basins and Inlets - Furnish precast concrete catch basins and
inlet conforming to the requirements of ASTM C913.
02450.20 Precast Concrete Sump Sections - Furnish precast rings and lids for precast concrete
sumps of portland cement concrete conforming to AASHTO M 199 ( ASTM C478).
02450.30 Metal Frames, Covers, Grates, and Steps - Comply with the following:
Projects on State Highways Item AASHTO (ASTM) Designation Grade Manhole frames and covers M 306 Class 35 B Inlet frames and grates M 306 Class 35 B M 227 (A663) 65 M 270 (A709) (A36) 36 M 103 (A27) 65 - 35 All Other Projects Item AASHTO (ASTM) Designation Grade Manhole frames and covers M 105 Class 30 B Inlet frames and grates M 227 (A663) 65 M 270 (A709) (A36) 36 M 103 (A27) 65 - 35 Steps for manholes shall be steel -reinforced plastic conforming to AASHTO M 199 ( ASTM C478) and AASHTO T 280 ( ASTM C497). The steel shall be deformed reinforcing bar conforming to AASHTO M 31 (ASTM A615) Grade 60, No. 4 minimum. The plastic material surrounding the reinforcing stee l bar shall be injection molded, with a textured, non- slip surface and a minimum thickness over the steel of 1/16 inch. Voids in the plastic will be cause for rejection of the step. Welding shall conform to AWS D1.1. Frames, covers and grates for use one with another shall have even and uniform bearings. Miscellaneous metal items and hardware shall conform to the appropriate requirements of Section 00560. Inlet frames and grates that are fabricated out of steel shall be galvanized according to the appr opriate requirements of Section 02530.
02450.40 Damaged Zinc or Aluminum Coating - Repair damaged zinc or aluminum coating
according to 02420.10(d). 02450.50 1101 02450.50 Acceptance - Acceptance of manholes and inlets will be according to 00165.35 and this Sectio n.
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