Emergency 72" Manhole Replacement

Project Location
Atascocita, TX
Construction cost
Construction Start/End
05/2017 - 07/2015



72” manhole with force main, fully deteriorated manhole removed and replaced. 30” line had a complete failure blocking the flow to the sewer plant., 20’ deep

Depth of structure:
20 VF
Health and safety:
Used conventional confined space entry program
Has any re-inspection been performed? What was the condition of the structure?
Yes, found to be in excellent condition

Brown & Gay Engineers, Inc.


Prior to installation of the Danby liner, the contractor installed 20 VF of liner plate, then began reconstructing the manhole with a double mat of rebar then installed Danby PL3E flat panels and 1’ thick structural concrete in walls. The 12” force main was tied in using a custom fabricated HDPE force main drop. An 8’x8’x18” thick concrete manhole lid was also constructed with the underside having the corrosion resistant Danby PVC liner. This manhole was constructed by Boyer, Inc. of Houston, Tx

Method of flow bypass or diversion, if used:
Temporary flow diversion of the upstream pipe directly to sewer plant


Problems encountered during construction:
Problems encountered after construction:
1) Prior to construction, a utility pole 10' from manhole was in jeopardy of sinking with the surrounding ground sloughing off. 2) Remove blockage in 30” downstream line, reinforced with steel pipe, CIPP full from manhole to sewer plant