- 624 - SECTION 718 -- CULVERT PIPE
718.01 Description
1.This work shall consist of furnishing and installing culvert pipe of the various types shown in the contract.
718.02 Material Requirements
1.The Contractor shall not order the culvert pipe until a list of sizes and lengths is furnished by the Engineer.
2.Reinforced concrete pipe shall conform to the requirements of Section 1037.
3.Corrugated metal pipe shall conform to the requirements of Sections 1035 and 1036.
4.Plastic pipe shall conform to the requirements of Section 1038. 5. Slotted pipe shall conform to the requirements shown in the contract.
6.Granular material for bedding shall conform to the requirements shown in the contract.
7.Flap gates shall conform to t he requirements of Section 1043.
718.03 Construction Methods
1.Excavation and backfilling shall be performed by the Contractor in accordance with the applicable requ irements of Section 702 and the contract.
2.The installation of Culvert Pipe shall be in accordance with Sections 701, 702, 719, 720, 721, 722, 724, 725, and 726.
3.Deflection Testing:
a.When plastic pipe is used or when corrugated metal pipe 48” (1200 mm) and larger is used, the Cont ractor shall peri odically check for pipe deflection during pipe installa tion 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" mandrels. 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.
d.Deflection testing will not be required on corrugated metal pipe extensions of less than 25 feet (7.6 m). Culvert Pipe 718.04 - 625 - 4. Granular bedding and backfill is required for all flexible pipe installed under the roadway prism. Granular bedding and backfill will not be required for drop pipes, temporary pipes or corrugated metal pipe extensions unless called for in the contract. Granular bedding and/or backfill will be optional for concrete pipe when t he Contractor selects the Type 3 Installation.
5.The Contractor shall install flap gates on the ends of culvert pipe when required in the contract. They shall be installed in accordance with the manufacturer’s recommendations and standards.
6.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.
718.04 Method of Measurement
1.a. All pipe (round, elliptical, ar ched, or slotted) is measured in linear feet (meter) along the longitudinal axis once in place and accepted. In no case will the measured length be greater than the order length.
b.Each type and size of pipe is measured separately. c. The additional length due to connections will not be measured for payment.
d.Granular bedding will not be measured for payment, but shall be considered subsidiary to the type of pipe being installed.
2.The length of round, arched, or elliptical pipe with elbows will be provided an additional length allowance to cover the cost of each elbow. The allowance is shown in Table 718.01. Table 718.01 Elbow Allowances Pipe Diameter or Round Equivalent Size Pipe Length Allowance for Each Elbow Less than 36 inches (900 mm) 7 feet of pipe (2.1 m) 36 to 54 inches (900 mm to 1350 mm) 6 feet of pipe (1.8 m) Greater than 54 inches (1350 mm) 5 feet of pipe (1.5 m)
3.When flexible pipe connections are required by the Engineer, an additional allowance to cover the cost of each connection shall be made as shown in Table 718.02.
718.04 Culvert Pipe
- 626 - Table 718.02 Connection Allowances Pipe Diameter or Round Equivalent Size Pipe Length Allowance for Each Connection Less than 21 inches (530 mm) 3 feet of pipe (900 mm) 21 inches (530 mm) or larger 4 feet of pipe (1200 mm)
4.Flap gates shall be measured fo r payment by the each, complete in place. The pay item is “_____ inch (mm) Automatic Flood Control Gate".
718.05 Basis of Payment
1.Pay Item Pay Unit ____inch (mm) Culvert Pipe, Linear Foot (LF) Type____ [meter (m)] ____inch (mm) Automatic Flood Each (ea) Control Gate ____inch (mm) Slotted Culver t Linear Foot (LF) Pipe, Type____ [meter (m)] ____inch (mm) Round Equival ent Linear Foot (LF) Culvert Pipe, Type____ [meter (m)]
2.Flap Gates shall be paid for at the contract unit price per each under the item, "____ inch (mm) Auto matic Flood Control Gate". Each different size is a separate pay item.
3.Granular bedding for culvert pipe shall be subsidiary to the appropriate culvert pipe pay item.
4.Payment is full compensation for all work described in this Section. - 627 - SECTION 719 -- FLEXIBLE PIPE CULVERTS (CORRUGATED METAL AND PLASTIC )
719.01 Description
1.This work shall consist of fu rnishing and installing new corrugated metal pipe, helical corrugated metal pipe, slotted pipe, pipe-arches, high density polyethylene (corrugated interior), high density polyethylene (smooth interior), and polyvinyl chloride pipe, and the relaying of existing corrugated metal pipe, helical corrugated metal pipe, slotted pipe, pipe-arches, high density polyethylene (corrugated interior), high density polyethylene (smooth interior), and polyvinyl chloride pipe at the locations shown in the contract or ordered by the Engineer in accordance with the requirements of these Specifications.
719.02 Material Requirements
1.Flared end sections for flexible pipe shall be metal and shall conform to the requirements of Section 1036.
2.Approved water-tight and soil-tight joints are shown on the Department’s Approved Products List.
3.Flap gates shall conform to t he requirements of Section 1043.
4.Corrugated metal pipe, helical corrugated metal pipe, and pipe-arches shall be Zinc Coated (Galvanized) Pipe, Aluminum Coated Pipe, or Polymer Coated Pipe and shall conform to the requirements of Section 1035.
5.Slotted pipe shall conform to the requirements shown in the contract.
6.Unless otherwise specified in the contract, the minimum gage or sheet thickness shall conform to Sections 1035 and 1036.
7.Plastic pipe shall conform to the requirements of Section 1038.
8.The Contractor shall not order or deliver the pipe until a list of sizes and lengths is furnished by the Engineer.
719.03 Construction Methods
1.Excavation and backfilling shall be performed by the Contractor in accordance with the requirements of Section 702 and the contract.
2.The Contractor shall lay the pipe true to the lines and grades shown in the contract or as directed by the Engineer. Any pipe which is not true in alignment or to the established grade or which shows any settlement after laying shall be taken up and relaid by t he Contractor at no additional cost to the Department.
3.Deflection Testing: a. When plastic pipe is used or when corrugated metal pipe 48 inch (1200 mm) or larger is used, the Contractor shall periodically check for pipe deflection during pipe installa tion 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.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 658–660 of 1,048.