T RENCH DRAINS DE SCRIPTION 600.
01.01 General. This work consists of constructing trench drains .
M ATERIALS 600.
02.01 General. Material shall conform to the following Sections:
Portland Cement Concrete ...................................................................................................................................................... Section 501 Reinforcing Steel ..................................................................................................................................................................... Section 505 T rench drains consist of prefabricated drain sections along with concrete backfill. Use prefabricated portions of trench drains listed in the QPL and that meet the minimum requirements specified in the contract documents. B ackfill shall be Class A or Class AA concrete. T rench drains shall be rated for installation in a highway environment where snowplows and high- speed highway traffic will be present. T rench drain channels shall have minimum slope of 0. 5%, unless specified otherwise. Dimensions and depths specified are the minimum acceptable. I ncreased depths shall maintain or increase trench slope and provide positive drainage to the connecting inlet. The trench width (W) specified shall be the minimum internal width of the trench and not the grate width. Changes to the specified dimensions, or minor differences between nominal and actual dimensions will only be allowed with written approv al. F rames and grates shall be capable of withstanding H-20 load ing in accordance with AASHTO M30 6. G rates shall be bicycle safe and removable. Grates shall have a minimum open area of 50%. Removable grates shall be held in place by locking devices that are tamper resistant and provide a minimum repetitive pullout resistance of 223 kg per linear meter (150 pounds per linear foot ) of inlet grate after completion of 1000 hours of salt spray testing in accordance with ASTM B117. G rates shall fit into frames without rocking. Frames shall be secured to the surrounding concrete backfill with steel anchoring rods a minimum of 6 mm ( 1/4 in.) in diameter and a minimum of 125 mm ( 5 in.) in length. Alternatively, other methods of securing the frame to the concrete backfill or trench drain will be acceptable provided that a minimum pullout resistance of 446 kg per linear meter ( 300 pounds per linear foot ) of length of trench drain frame is assured. T rench drain systems selected shall be capable of accommodating any horizontal or vertical curves or deflections of the roadway segment they are to be constructed in. CO NSTRUCTION 600.
03.01 General. Install t rench drains according to the plans, manufacturer’s recommendations , and as
specified. S awcut existing plantmix or concrete surfaces to the required dimensions. Excavate in accordance with Section 206 to the lines and grades as shown on the plans and as directed. G rade and compact the trench bottom to provide a firm and uniform bearing throughout the entire length of the trench drain. Pr ovide the necessary facilities and equipment for lowering and properly p lacing the sections of trench drain in to the trench. La y and join the trench drain in accordance with the manufacturer’s recommendations and connect to the proposed drop inlets . 600 TRENCH DRAINS Position the drain sections in the excavated trench so that, when finished, the surrounding concrete backfill will be a minimum of 3 mm ( 1/8 in.) and a maximum of 5 mm ( 3/16 in.) above the level of the inlet frame. In no case shall the frame or grate of the trench extend above the le vel of the surrounding concrete backfill. Maintain full and unobstructed cross sectional flow area throughout the entire length of the trench drain installation. Outlet plates, end caps, adapters, pipe outlets, or other reducers and restrictions in flow area will not be permitted at the trench drain outlet connection. Place the concrete backfill as shown on the plans, but in no case shall the thickness of concrete backfill, when measured normal to the walls or bottom of the trench drain, be less than 150 mm ( 6 in.). Place the concrete backfill in the trench against undisturbed material at the sides and bottom of the trench and in a manner that will prevent floating or shifting of the trench drain and voids in, or segregation of, the concrete. Immediately remove f oreign material which has fallen into the trench prior to, or during , placement of the concrete. Where necessary, forming or earth plugs shall be constructed and compacted at the ends of the planned concrete backfill to contain the concrete within the trench. Finish the concrete backfill flush with adjacent surfacing unless specified otherwise. Where trench drains are to be installed and connected to existing facilities, remove the required portion of the existing structure to accommodate the ins tallation. Perform the removal with equipment that will not damage the existing structure. Dispose of removed materials according to Subsection 107.14. Provide a watertight mortared joint at the connection. Remove excess mortar and finish surfaces smooth. METHOD OF MEASUREMENT
600.04.01 Measurement. Trench drains will be measured by the linear meter (linear foot) for the length
shown on the plans . If the incremental segment length of the trench drain selected does not match the specified length, one additional segment shall be constructed in order to provide the minimum length specified. The additional length of trench drain placed in excess of the length shown on the plans will not be measured for payment. Excavation for trench drains will be measured and paid for according to Section 206. BASIS OF PAYMENT
600.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contract
price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Payment will be made under: Pay Item Pay Unit Trench Drain ...................................................................................................................................................... Linear Meter (Linear Foot) SECTION 601 PIPE CULVERTS — GENERAL DESCRIPTION
601.01.01 General. These specifications include general requirements that are applicable to all types of culvert
pipes except structural plate pipe, irrespective of the material or culvert use. This work consists of furnishing and installing pipe culverts, end sections, and headwalls. The lengths shown on the plans are approximate. Do not order and deliver the culvert pipe until a list of sizes and lengths is furnished by the Engineer. MATERIALS
601.02.01 General. Material shall conform to the following Section or Subsections:
Portland Cement Concrete ................................ ..................................................................................................................... Section 501 Portland Cement ................................ .................................................................................................................................... Section 701 Grout and Mortar Aggregate .................................................................................................................................... Subsection 706.03.04 Gaskets ................................ ................................................................................................................................... Subsection 707.03.02 Reinforced Concrete Pipe ................................ ....................................................................................................... Subsection 708.03.01 Clay Pipe ................................................................................................................................................................ Subsection 708.03.03 Plastic Pipe ............................................................................................................................................................. Subsection 708.03.04 Corrugated Steel Pipe ............................................................................................................................................. Subsection 709.03.01 Corrugated Aluminum Pipe ..................................................................................................................................... Subsection 709.03.02 Design pipes in conformance with the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications. CONSTRUCTION
601.03.01 Earthwork. Excavation and backfill shall conform to Sections 206 and 207.
Bed pipe as shown in the plans. Use Class C bedding requirements unless specified otherwise. The lines and grades will be established. The height of new embankments may be varied as directed before installing pipes in new embankments on a steep slope or in a difficult location.
601.03.02 Headwalls. Where shown on the plans, construct headwalls in connection with culvert pipes. Make
the ends of the pipe flush with the headwall face. Construct headwalls according to Sections 501, 502, and 505.
601.03.03 End Sections. Excavate the bed for the end section to the required width and grade. For metal end
sections with toe plates, excavate a trench for the toe plate in a manner to permit the toe plate to be against the inner face of the trench in its final position. After end sections have been pr operly secured to the pipe, backfill the trench and firmly compact. Place the precast concrete end section with its tongue (or groove) fully entered in the groove (or tongue) of the pipe. End sections installed on plastic pipes shall be designed to speci fically fit the pipe. The end section shall engage a minimum of 2 pipe corrugations for exterior installations.
601.03.04 Jacked Pipes. Jack culvert pipe in place between the limits shown on the plans and conforming to
the requirements of the respective S ection for the pipe used. The strength of pipe or wall thickness of pipe will be determined for vertical load only. Determine any additional reinforcement or strength required to withstand jacking pressure and furnish without additional compensation. Submit a boring and jacking plan for approval describing the proposed equipment, materials, jacking loads, method of cushioning joints, and labor to be used to accomplish the work.