609.01 Description. This item shall consist of the construction
of drop inlets, yard drains, junction boxes, and dr op inlet extensions with rings and covers or grates and frames, accordi ng to these specifications, of the type, size, and dimensions s hown on the plans, and in conformity with the locations, lines, and gr ades shown on the plans, or as directed.
609.02 Materials. (a) The concrete shall comply with Section
802 for Class A Concrete. The Department will perf orm all acceptance sampling and testing at the frequencies shown for Contractor acceptance testing in Subsection 802.06.
b.Reinforcing steel shall comply with Section 804.
c.Steel for welded steel grates and frames shall comp ly with AASHTO M 270, Grade 36 (250).
d.Iron castings for rings and covers, grates and fram es, and other appurtenances, shall comply with AASHTO M 105 , Class 35B. Bearing surfaces between rings and cove rs or grates and 440 frames shall be cast or machined with such precisio n that uniform bearing shall be provided throughout the perimeter area of contact.
e.Paint shall comply with Section 638.
f.Precast concrete units of the type, size, and desig nation shown on the plans may be used in lieu of cast-in-place c oncrete units and shall be subject to the requirements of AASHTO M 19 9 or ASTM C 913 as applicable, and shall be furnished from sour ces listed on the Department’s QPL. Units so manufactured must bear evidence that the component materials have been tested and approv ed and that the construction methods have been inspected by an Insp ector approved by the Engineer. Joint materials shall comply with Subsection 606.02(b)(4).
g.Curing Materials. Curing materials shall comply with Subsection 501.02(i).
h.Pipe culverts for yard drains shall comply with Subsection 606.02.
609.03 Construction Requirements. Drop inlets, junction
boxes, and drop inlet extensions shall be construct ed with either reinforced or non-reinforced concrete, as shown on the plans. The Engineer may adjust the plan locations of drop inle ts and junction boxes to avoid the necessity of cutting pipe or to avoid utility lines provided such adjustment does not move the drop inl et out of a low point in the gutter line or into a curb radius. Concrete shall not be placed until the Engineer has inspected the forms and the placement of reinforcing steel and ri ngs or frames. Round monolithic drop inlets may have the floors ca st monolithically with the walls. All other concrete floors shall be placed at least 24 hours before beginning construct ion of the walls. A longer period of time may be required if weather conditions make it necessary. When completed, the concrete shall be cured as spec ified in Subsection 501.05(l). Walls shall be constructed to form a tight joint wi th the floor and around the inlet and outlet pipes. Pipes shall be cut flush with the inside surfaces of the wall. 441 Utility lines that are carried through the walls sh all be protected to avoid damage. When tops of drop inlets are cast in place, the fac es of drop inlets and drop inlet extensions shall be placed as a part of the curb in order to preserve the proper alignment. Precast reinforced concrete drop inlet or junction box sections shall be set with joints complying with Subsection 606.02(b)(4). Yard drains shall be constructed of a 12" (300 mm) corrugated metal pipe with the use of a pipe elbow or tee, as the case requires, at the bottom of the drain. The ring and grate sha ll be set on the top of the pipe culvert as shown on the plans. The con crete square frame shall be formed and placed to match the grade of the ring and grate. Metal rings or frames shall be set accurately to th e finished elevations so that no subsequent adjustments will b e necessary. They shall be set in a full mortar bed with firm be aring on the walls or securely fastened to the forms so that no moveme nt will occur when concrete is placed around them. Welded steel grates and frames shall be welded with 1/4" (6 mm) fillet welds according to Section 807. The grates and frames shall be painted according to Section 638 or hot dip galvani zed according to AASHTO M 111, Thickness Grade 100. Iron castings for rings and covers or grates and fr ames shall not be painted. Backfilling around structures shall be with approve d material, free from large lumps or clods. The material shall be placed alongside the structure in layers not to exceed 6" (150 mm) in depth at near optimum moisture content and compacted with mechanical equipment to 95% of maximum density as determined b y AASHTO T 99 for the full depth of structure. The D epartment will perform acceptance sampling and testing of the comp acted backfill material in accordance with Subsection 210.10 at th e frequencies established in the Department’s Manual of Field Sampling and Testing Procedures . 442 Structures shall be cleaned of any accumulation of silt, debris, or foreign matter of any kind, and shall be reasonably free of such accumulations at the time of final inspection.
609.04 Method of Measurement. Drop Inlets, Junction Boxes,
and Drop Inlet Extensions of the length specified w ill be measured by the unit. Yard Drains will be measured by the u nit. Each unit shall consist of the concrete frame, the ring and g rate, and all pipe required to form the vertical portion of the drain including a standard elbow or tee.
609.05 Basis of Payment. Work completed and accepted and
measured as provided above will be paid for at the contract unit price bid each for Drop Inlets, Drop Inlet Extensio ns, Yard Drains, or Junction Boxes, of the type specified, which pri ce shall be full compensation for constructing drop inlets, drop inl et extensions, yard drains, or junction boxes; for furnishing, ins talling, and painting, if required, of rings and covers or grate s and frames; for excavation and backfill; and for all materials, lab or, equipment, tools, and incidentals necessary to complete the wo rk. Payment will be made under: Pay Item Pay Unit Drop Inlets (Type___) Each Junction Boxes (Type___) Each Drop Inlet Extensions (__ ′)(__m) Each Yard Drains Each
Source: , Edition.