Frames, Grates, and Median Inlets Art. 604.03 height of the casting to be protected meets the proper sizing requirements for the rubber ramps as shown below. Dimension Requirement Inside Opening Outside dimensions of casting + 1 in. (25 mm) Thickness at inside edge Height of casting 1/4 in. (6 mm) Thickness at outside edge 1/4 in. (6 mm) max. Width, measured from inside opening to outside edge 8 1/2 in. (215 mm) min. Placement shall be according to the manufacturer’s specifications. Temporary ramps for castings shall remain in place until surfacing operations are undertaken within the immediate area of the structure. Prior to placing the surface course, the temporary ramp shall be removed. Excess material shall be disposed of according to Article 202.03.
603.08 Adjusting Rings. As an option to Articles 603.03 through 603.07, the
adjustment of frames and grates may be accomplished through the use of adjusting rings that fit on top of the frame. These adjusting rings shall be fabricated as a one- piece assembly from gray iron, ductile iron, or structural steel. They shall provide a structural capacity equal to or greater than the existing frame and shall not affect the opening size or surface appearance. The rings shall have a device for positively positioning and fastening the ring to the existing frame to prevent movement under traffic.
603.09 Basis of Payment. This work will be paid for at the contract unit price
per each for FRAMES AND GRATES TO BE ADJUSTED or FRAMES AND LIDS TO BE ADJUSTED. SECTION 604. FRAMES, GRATES, AND MEDIAN INLETS
604.01 Description. This work shall consist of furnishing, and installing
frames, grates, lids, covers, and median inlets where such items are not included in the cost of the drainage or utility structures involved.
604.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Gray Iron Castings ............................................................................. 1006.14
b.Structural Steel .................................................................................. 1006.04
c.Ductile Iron Castings .......................................................................... 1006.15
d.Portland Cement Concrete ..................................................................... 1020
e.Reinforcement Bars and Welded Wire Reinforcement ...................... 1006.10
604.03 Materials Permitted. The materials permitted for fabrication of the
various types of frames, lids, grates and the various numbers of median inlets shall be according to the following. Art. 604.03 Frames, Grates, and Median Inlets Type or Number Frame Grate Lid Cover 1 Gray Iron Gray Iron or Ductile Iron 3 & 3V Gray Iron Gray Iron or Ductile Iron 4 Gray Iron Gray Iron or Ductile Iron 5 Gray Iron Gray Iron or Ductile Iron 6 Gray Iron Gray Iron or Ductile Iron 7 Gray Iron or Ductile Iron 8 Gray Iron or Ductile Iron 9 Gray Iron Gray Iron or Ductile Iron 10 Gray Iron Gray Iron or Ductile Iron 11&11V Gray Iron Gray Iron or Ductile Iron 12 Gray Iron Gray Iron or Ductile Iron 15 Gray Iron Gray Iron or Ductile Iron 20 Gray Iron or Ductile Iron Gray Iron or Ductile Iron* 21 Gray Iron or Ductile Iron Gray Iron or Ductile Iron 22 Gray Iron or Ductile Iron Gray Iron or Ductile Iron 23 Gray Iron or Ductile Iron Gray Iron or Ductile Iron 24 Gray Iron or Ductile Iron Gray Iron or Ductile Iron Median Inlet (STD 604101) Gray Iron Ductile Iron Median Inlet (STD 604106) Gray Iron Ductile Iron 2A & 2B Gray Iron or Ductile Iron Gray Iron or Ductile Iron A & B Gray Iron or Ductile Iron Removing or Filling Existing Manholes Art. 605.01 CONSTRUCTION REQUIREMENTS
604.04 General. Frames placed on concrete or masonry surfaces shall be set
in full mortar beds. The mortar shall be mixed in proportions of one part cement to three parts sand, by volume based on dry materials. Castings shall be set accurately to the finished elevation so that no subsequent adjustment will be necessary. For frames and grates, Type 6 and 12, a two piece frame may be used with the approval of the Engineer. For frames and grates, Type 21 and 22, the notch in the grate and the 9/16 in. (14 mm) diameter holes in the frame are for the insertion of one galvanized 1/2 in. (M12) diameter bolt and nut. The bolt and nut shall be placed as directed by the Engineer to provide for correct replacement of the grates during maintenance operations. When frames and grates, Type 21, is used in conjunction with a precast concrete barrier, a gap of at least 2 ft (600 mm) on both sides of the casting shall be provided to permit cast-in-place barrier to be constructed to incorporate the barrier box. When median inlets (STD 604101 and STD 604106) are specified, the concrete apron shall be constructed of Class SI concrete and shall be reinforced with welded wire reinforcement consisting of 6 x 6 in. (150 x 150 mm) mesh, No. 4 (5.7 mm) wire, weighing 58 lb/100 sq ft (2.8 kg/sq m). Additional reinforcement, when specified for Type 15 frames and lids, will be included in the unit bid price of the type of structure specified.
604.05 Basis of Payment. This work will be paid for at the contract unit price
per each for FRAMES, GRATES, FRAMES AND GRATES, FRAMES AND LIDS, and GRATES AND COVERS, of the type or types specified, and at the contract unit price per each for MEDIAN INLETS of the number specified. The unit price bid for median inlets shall include castings, concrete, and reinforcement for constructing the concrete apron. The unit price bid for frames and lids, Type 15, shall include the extra form work required by the special construction under CASE I or CASE II, and no additional compensation will be allowed. SECTION 605. REMOVING OR FILLING EXISTING MANHOLES, CATCH BASINS, AND INLETS
605.01 Description. This work shall consist of removing or filling existing
manholes, catch basins, and inlets. Art. 605.02 Removing or Filling Existing Manholes
605.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Portland Cement Concrete ..................................................................... 1020
b.Building Brick (Made from Clay or Shale) .......................................... 1041.01
c.Concrete Brick ......................................................................................... 1042 CONSTRUCTION REQUIREMENTS
605.03 Removing Existing Manholes, Catch Basins, and Inlets. Existing
manholes, catch basins, and inlets designated to be removed at locations where the existing inlet and/or outlet pipes are to be abandoned, shall be removed for the full depth of structure. If the abandoned pipes are not designated to be removed, the ends of the pipe at the structure shall be sealed with Class SI concrete or brick and mortar. After the concrete or mortar has set, the hole formed by removal of the structure shall be backfilled with sand and the sand compacted. Existing manholes, catch basins, and inlets designated to be removed at locations where flow is to be maintained in the existing storm sewer system or a proposed storm sewer is to be connected to the existing system, shall be removed to a depth of at least 4 in. (100 mm) below the bottom of the storm sewer system. All debris in the structure below the storm sewer shall be removed and replaced with compacted sand to the approximate elevation of the bottom of the sewer. The existing storm sewer shall then be connected to maintain flow with pipe of the same kind and size as the existing pipe, or the proposed storm sewer shall be connected to the existing system, and the joints sealed. If a proper connection cannot be made at a joint in the existing sewer, a collar of Class SI concrete shall be used to seal the joint. The hole formed by the removal of the structure shall then be backfilled with sand and the sand compacted.
605.04 Filling Existing Manholes, Catch Basins, and Inlets. The tops of all
existing manholes, catch basins, and inlets to be filled shall be removed to an elevation of at least 3 in. (75 mm) below the earth subgrade of the proposed improvement. All inlet and/or outlet connections shall be securely sealed with Class SI concrete or brick and mortar. After the concrete or mortar has set, the existing structure shall be filled with sand and the sand compacted.
605.05 Disposal of Excess Material. All material resulting from the filling or
removing of existing manholes, catch basins, and inlets shall be disposed of by the Contractor according to Article 202.03.
605.06 Basis of Payment. The work of removing existing manholes, catch
basins, and inlets at locations where the existing inlet and/or outlet pipes are to be abandoned will be paid for at the contract unit price per each for REMOVING MANHOLES, REMOVING CATCH BASINS, or REMOVING INLETS. The work of removing existing manholes, catch basins, and inlets at locations where flow is to be maintained in the storm sewer system will be paid for at the contract unit price per each for REMOVING MANHOLES TO MAINTAIN FLOW,
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 554–557 of 1,217. View official source ↗