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CAST-IN-PLACE CONCRETE PIPE (CIPCP)

Construction of cast-in-place concrete pipe will be permitted when shown or specified in the

Contract. Cast-in-place concrete pipe shall consist of portland cement concrete placed in a

prepared trench at the locations shown and specified in the Contract and these Specifications.

The Agency may deny the use of cast-in-place concrete pipe if, in the Agency’s judgment, local

conditions make the use of such pipe undesirable.

Unless otherwise specified herein, the placement of cast-in-place concrete pipe shall

conform to the requirements of Section 38, “Sewer and Drain Construction”, of these

It is the Contractor’s responsibility to determine the suitability of the excavated trench for the

placement of cast-in-place concrete pipe. The Contractor shall determine whether the trench

walls will provide sufficient lateral support to prevent deflection and cracking of the pipe due to

backfill and live loads, and that the trench width at the top of the pipe will be sufficiently narrow

to preclude additional loading on the pipe.

If, after examining the sides of the trench, the Contractor elects to place cast-in-place

concrete pipe, and the pipe subsequently develops longitudinal cracks exceeding five feet (5’) in

length, the Contractor, at the Contractor’s expense, shall repair or replace the pipe as directed

Should the Contractor decide not to place cast-in-place concrete pipe after examination of

the trench sidewalls, alternative pipe conforming to the requirements in Section 38, “Sewer and

Drain Construction”, of these Specifications shall be furnished and placed, and no additional

payment will be made.

36-2 PIPEMAKING EQUIPMENT

The pipe shall be constructed with equipment specially designed for constructing cast-in-

place concrete pipe, as approved by the Agency. The Contractor shall furnish evidence of

successful operation of the proposed equipment on other work. Equipment not suitable to

produce the quality of work required for the pipeline will not be permitted to operate on the

36-3 TRENCH EXCAVATION

Trench excavation shall conform to Section 19, “Trench Excavation, Bedding and Backfill”,

of these Specifications. The trench shall be excavated to the lines and grades of the completed

pipe as shown on the Plans and within the tolerance specified in these Specifications. The

trench shall be of the proper width and the bottom of the trench shall be shaped to the external

diameter of the pipe to be constructed. The bottom of the trench shall be prepared to provide

full, firm, uniform support by undisturbed earth or compacted fill over a minimum of the bottom

one hundred eighty degrees (180°) of the outside of the pipe. Trench width at the top of pipe

shall not exceed the outside diameter of the pipe at the spring line.

Unless otherwise directed by Agency or specified in the Special Provisions, the trench in

which pipe was placed during the previous 24 hours, plus the trench required for the next day’s

work, plus additional trench one half the length of the trench required for the next day’s work, is

the total maximum allowable length of trench on any one portion of the Work that may remain

open at the end of each Working Day. The remainder of the trench shall be backfilled and

compacted, and when in streets or highways, opened to traffic as soon as practicable.