60" Cast-in-Place Concrete Pipe

Project Location
Houston, Texas
Construction cost
$540,000 - $8.14/ID in-ft
Construction Start/End
06/22/1998 - 07/24/1998


When was it constructed and how long has it been in service:
Unknown age, but severely corroded in upper 2/3 of pipe

Diameter of line, sewer pipe material (RCP, MCIP, brick, etc.), length of rehab portion: 60", Cast-in-place concrete pipe, 1106 linear feet.

Depth of pipe:
0 -10 feet to crown.
Depth of ground water:
No ground water above pipe invert.
Health and safety:
Used conventional confined space entry program.
Has any re-inspection been performed? What was the condition of the pipe?

Mac Bakri, P.E.
City of Houston
Telephone: 713-646-5609
Project: 4250-98R (GFS #R1040-06-03)


Ventilation and odor control used:
Fresh air pumped into pipe at upstream manhole, and suction fan at downstream manhole to provide adequate ventilation during the work periods.
Rehab method used:
Danby Panel Lok III with full annulus grouting with cementitious grout with minimum compressive strength of 5000 psi.
Cleaning method used (if required) and who cleaned the line:
High pressure (10,000 psi) water blasting performed by the Danby licensee (Kinsel Industries, Inc.).
Method of flow bypass or diversion, if used:
Flows 100% pumped via 3 Godwin pumps (100% over capacity) and temporary HDPE fusion welded pipe.


Problems encountered during construction:
Due to construction method used in building this pipe, variations in alignments (both horizontal and vertical) and in wall thickness were severe enough so that 54" Hobas slipliner (original choice for rehab) could not be installed. The Danby liner installed was 55" ID with alignment adjustments at discrete location as required.
Problems encountered after construction: