PVC liner used to rehab multiple manholes damaged by sinkholes

Problem: Municipal utility districts around the Houston, Texas, area were discovering sinkholes in the ground surrounding manholes. Hydrogen sulfide gas from force main discharges was causing the problems. Inspections determined that the integrity of the manholes was compromised and was quickly deteriorating, causing dirt and groundwater infiltration that in turn caused excess debris to flow into the wastewater treatment plant. 

Solution: A corrosion-resistant Danby PVC liner was used to rehab the manholes by excavating out any remains of the manhole below the base while installing a liner plate for trench safety. The manholes were designed with 1-inch-thick walls with double-mat No. 5 rebar and 5,000 psi minimum concrete, lined with Danby PVC corrosion-resistant modular panels. An HDPE force main drop was also designed and installed. The manhole lids are designed for HS20 loading and were also constructed and lined using the Danby PVC liner to provide the corrosion-resistant protection necessary for a manhole with a force main. The liner easily accommodated the depth, shape and even the lateral connections found in these manholes. 

Result: The liner and panels help produce structurally sound, corrosion-resistant reconstructed manholes and manhole lids. 

281-598-1126; www.danbyrehab.com



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