- 634 - SECTION 721 -- DRIVEWAY CULVERT PIPE
721.01 Description
1.This work shall consist of furnishing and installing new pipe culverts, typically in round, pipe-arch, or elliptical shapes, of the various types at the locations shown in the contract or designated by the Engineer.
721.02 Material Requirements
1.The pipe furnished shall c onform to the requirements in Table 721.01. Table 721.01 Material Requirements Applicable Materials Section Corrugated Me tal Pipe ............................... .1035 Reinforced Concrete Culvert Pipe .............. .1037 Plastic Pipe ................................................ .1038
721.03 Construction Methods
1.The Contractor shall not order or deliver the pipe until a list of sizes and lengths are furnished by the Engineer.
2.The corrugated metal pipe and reinforced concrete pipe for driveways shall be installed in accordance with the applicable portions of Sections 718, 719, and 720. Plastic pipe for driveways shall be installed in accordance with the contract, ASTM D 2321, and the manufacturer’s recommendations.
3.Deflection Testing: a. When plastic pipe is used or when corrugated metal pipe 48 inch (1200 mm) and larger is used, t he Contractor shall periodically check for pipe deflection during pipe installation and again not less than 30 days following completion of the roadway embankment. The internal diameter of plastic pipe shall not be reduced by more than 5% of its design diameter. The internal diameter of corrugated me tal pipe shall not be reduced by more than 7.5% of its design diameter. If t he installation does not meet these requirements, the pipe shall be remo ved and replaced at no additional cost to the Department.
b.During the required 30-day reinspection of the culverts, the Contractor must treat the culvert as a “confined space”. Appropriate safety procedures shall be followed. The Cont ractor shall provide the appropriate safety equipment.
c.Optional devices for deflection testing include electronic deflectometers, calibrated television or video cameras, or properly sized "go, no-go" mandrel. Deflection measurements can be made directly with extension rulers or tape measures at 10 feet (3 m) increments in pipes that allow safe entry. To ensure accurate measurements, the pipe should be cleaned before testing.
4.Granular bedding and backfill will not be required for driveway culvert pipe unless called for in the contract. Driveway Culvert Pipe 721.05 - 635 - 5. When polymer pre-coated pipe is used, in order to protect the coated pipe, the Contractor shall us e padded or nonmetallic slings and padded straps when handling the pipe. This includes unloading, moving and installation.
721.04 Method of Measurement
1.All driveway culvert pipe shall be measured as described in Subsection 718.04.
721.05 Basis of Payment
1.Pay Item Pay Unit ____inch (mm) Driveway Linear Foot (LF) Culvert Pipe, Type____ [Meter (m)] ____inch (mm) Round Equival ent Linear Foot (LF) Driveway Culvert Pipe, Type____ [Meter (m)] Relaying Driveway Culvert Pipe Linear Foot (LF) [Meter (m)]
2.Excavation and backfilling for driveway culvert pipe will not be measured for payment, but shall be considered subsidiary to the appropriate pipe bid item.
3.Payment is full compensation for all work described in this Section. - 636 - SECTION 722 -- SEWERS
722.01 Description
1.This work shall consist of excavating sewer trenches, constructing and laying pipe sewers, and backfilling sewer trenches to the dimensions shown in the contract.
722.02 Material Requirements
1.The type of sewer pipe allowed shall be designated in the bid proposal Schedule of Items. When the ty pe of pipe is not designated in the Schedule of Items, the Contractor may use either Reinforced Concrete Sewer Pipe, High Density Polyethylene Pipe (Smooth Interior), or Polyvinyl Chloride Pipe.
2.All sewer pipes shall conform to the requirements in Table 722.01. Table 722.01 Material Requirements Applicable Materials Section Reinforced Concrete Sewer Pipe ...................... .1037 Plastic Pipe ....................................................... .1038 Cast Iron Pipe ................................................... .1039 Ductile Ir on Pipe................................................ .1039 Acrylonitrile-Butadiene-Styrene (ABS) Composite Se wer Pipe ..................................... .1038
3.The Contractor shall not orde r any pipe until a list of sizes and lengths is furnished by the Engineer.
4.Approved water-tight joints for plastic pipes are shown on the Department’s Approved Products List.
722.03 Construction Methods
1.Except for plastic sewer pipe installations under the roadway prism, all excavation, bedding and backfill shall be performed in accordance with the requirements of Sect ion 702 and the contract.
2.Plastic pipe shall be installed in accordance with the contract, ASTM D 2321, and the manufacturer’s recommendations.
3.Granular bedding and backfill are required for all plastic pipe installed for use in sewers under the roadway prism (or back of curb to back of curb). Plastic pipe installed beyond these limits will not require granular bedding and backfill, but will require installation in accordance with the contract, ASTM D 2321, and the manufacturer’s recommendations.
4.When the Contractor selects the Type 3 Installation shown in the contract, granular bedding and backfill will be optional for concrete pipe.
5.The Contractor s hall lay all pipes to th e line and grade established in the contract.
6.The Contractor shall inspect a nd sound all pipes fo r cracks or other defects and report to the Engineer.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 668–669 of 1,048.