Section 2417. Corrugated Culverts
A. Furnish and install corrugated culverts.
B. Roadway and entrance culverts are defined in Article 2416.01.
A. Use corrugated culverts that meet the requirements of Section 4141, or Section 4146 when polyethylene culvert pipe is designated.
B. Use round culvert pipe, unless specified otherwise. When required, elongate round pipe. When specified, use arch type pipe.
C. When placing under roadway, use corrugated steel culverts coated according to Article 4141.02.
D. A paved invert may be required according to the contract documents.
1. Table 2417.03-1 provides minimum allowable pipe sizes.
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Table 2417.03-1: Minimum Allowable Pipe Sizes |
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|
Culvert Use |
Minimum Pipe Size in. |
|
Roadway Culvert |
18 |
|
Entrance Culvert |
18* |
* 15 inch entrance pipes allowed on non-interstate and
non-primary roadways.
2. Table 2417.03-2 provides maximum allowable pipe sizes.
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Table 2417.03-2: Maximum Allowable Pipe Sizes |
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Corrugation Depth |
Maximum Pipe Size in. |
|
1/2 |
84 |
|
1 |
120 |
3. When culverts of sizes outside the limitations in Tables 2417.03-1 and 2417.03-2 are specified, they will be covered by the contract documents.
1. Place a minimum of 1 foot of fill over entrance culverts.
2. Place a minimum of 2 feet of fill over roadway culverts.
3. If necessary to accommodate construction traffic, increase depth of fill over roadway culverts to the nominal diameter of the pipe or 3 feet, whichever is greater.
1. Class B Bedding.
When installing corrugated metal pipe or polyethylene pipe for roadway culverts, use Class B Bedding described in Article 2416.03, D, 2.
2. Deflection Testing for Polyethylene Pipes.
a. General.
1) No sooner than 30 calendar days following pipe installation compaction and placing backfill material, or before paving, perform deflection testing on at least 10% of the pipe locations along their entire length at locations determined by the Engineer.
2) The internal diameter of a pipe is not to be reduced by more than 5.0% of its nominal inside diameter.
3) If any pipe fails post installation testing, the Engineer may require the Contractor to perform post installation testing on any additional pipes or all of the remaining pipes.
4) Pipes failing post installation testing will be considered unacceptable. Replace with new pipe or reinstall undamaged pipe. Test for deflection.
b. Pipe Diameter of 30 Inches or Less.
Perform deflection testing using a properly sized nine-point mandrel test.
c. Pipe Diameter Greater than 30 Inches.
Ensure the internal diameter of the entire length of the pipe is not reduced by more than 5.0% of it nominal inside diameter.
2417.04 method of measurement.
Measurement for the items associated with corrugated pipe culverts will be as follows:
A. Pipe culvert: measured length, in feet, of culvert installed, excluding aprons, to the nearest foot. Quantity of pipe will be determined along the axis. Measurement for pipe laterals terminating at a tee will be from the point of inlet to a point 6 inches from the outside of the main, less the length of the apron, if any.
B. Aprons: each apron installed will be counted for each size class.
C. Appurtenances (elbows, tees, and other fittings): not measured for payment, but quantity will be shown on the contract documents.
1. Roadway culverts: Article 2402.04, E, applies.
2. Entrance culverts: not measured for payment.
E. Granular Backfill (when required and furnished): Article 2402.04, E, applies.
F. Foundation treatment material (when placed at the direction of the Engineer): Article 2402.04, F, applies.
G. Beveled Pipe and Guard: Quantity shown in the contract documents.
H. Removal and Reinstallation:
1. Aprons: Each apron removed and reinstalled will be counted for each size class.
2. Pipe culvert: Measurement of pipe removed for each size class specified will be in linear feet from end to end.
Payment for the items associated with corrugated pipe culvert will be at the contract unit price as follows:
A. Pipe culvert: per linear foot for type and size specified.
B. Aprons: per unit for the size specified
C. Appurtenances: included in the contract unit price per linear foot for the pipe culvert.
1. Roadway culverts and the quantity of extra excavation for embankments: per cubic yard.
2. Entrance culverts: incidental to the contract unit price for corrugated pipe culvert.
E. Granular Backfill (when required and furnished): Article 2402.05, G, applies.
F. Foundation treatment material (furnished and placed): Article 2402.05, F, applies.
G. Deflection testing required according to the contract documents: incidental to the contract unit price for polyethylene pipe.
H. Beveled Pipe and Guard: Per unit for the size specified.
I. Removal and Reinstallation:
1. Aprons: Per unit for each size class of apron removed and reinstalled. Payment is full compensation for removal and reinstallation of apron.
2. Pipe culvert: Per linear foot for each size class of pipe removed and reinstalled. Payment is full compensation for removal and reinstallation of pipe.