for Highway Construction Page 476 of 71 5 SECTION 602 – CULVERTS
602.01 Description.
Provide and install culverts.
602.02 Material s.
Provide materials as specified in 601. Provide pipe joints that are either silt -tight or leak -resistance as specified in 601.02. Provide size No. 1, 2a, or 2b coarse aggregate for concrete as specified in 703.02. ¾” Aggregate for Untreat ed Base, Type B as specified in 703.04 with Class A compaction may be used in the bedding zone. Provide c ontrolled density fill as specified in 522.
602.03 Construction Requirements.
Install pipes as specified in 601.03. In continuous water flow situations (e.g., creek crossings), place controlled density fill in the bedding zone for 3 feet of culvert length at the upstream end.
602.04 Method of Measurement.
The Engineer will measure acceptably completed work by the foot along pipe centerline. The Engineer will allow an additional 1 foot for each connecting band used in making an authorized extens ion of existing corrugated metal pipe. The Engineer will include culvert sections attached to aprons in the measurement of culverts. Pipe aprons required only because PV C or PE pipe is used will not be measured or paid for separately when other pipe material is acceptable.
602.05 Basis of Payment .
The Department will pay for accepted quantities as follows: Pay Item Pay Unit _____ Pipe Culverts .............................................................................. FT _____ Pipe A rch ..................................................................................... FT Structure excavation, compacting backfill, trench zone backfill , and pipe bedding zone material are incidental and included in the culvert contract unit price. for Highway Construction Page 477 of 71 5 SECTION 603 – PIPE SIPHONS
603.01 Description.
Provide and install pipe siphons .
603.02 Materials.
Provide materials as specified in 601. Provide pipe joints that are leak -resistant with a maximum working pressure of 10 psi as specified in 601.02. Provide size No. 1, 2a, or 2b coarse aggregate for concret e as specified in 703.02 and ¾ inch minus aggregate for untreated b ase as specified in 703.04.
603.03 Construction Requirements.
Install metal pipe siphons as specified in 601.03.
603.04 Method of Measurement.
The Engineer will measure acceptably completed work by the foot along pipe centerline. The Engineer may calculate the length from the dimensions of the approved siphon layout.
603.05 Basi s of Payment .
The Department will pay for acceptable quantities as follows: Pay Item Pay Unit __ Pipe Siphon ....................................................................................... FT Structure excavation, compacting backfill, trench zone backfill , and pipe bedding zone material are incidental and included in the pipe siphon contract unit price.