Methodology
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. Odor control of exhaust air as required by City.
Rehab method used:
Danby Panel Lok with full annulus grouting with cementitious grout with minimum compressive strength of 5000 psi. Panel Lok flat panels arched from “J” strip anchors at invert corners. No lining of invert.
Cleaning method used (if required) and who cleaned the line:
High pressure (10,000 psi) water blasting performed by the Danby licensee (Stacy & Witbeck, Inc.).
Method of flow bypass or diversion, if used:
Full bypass pumping of 21 MGD flow.
Hurdles
Problems encountered during construction:
Initial specifications required monolithic grouting that, in turn, required formwork. Use of wood forms impeded cooling at the PVC surface resulting in excessive temperature differential across the grout thickness that resulted in cracking of the grout (high cement content produced high heat of hydration). Removal of forms and stage grouting resolved the problem. Grout cracks repaired by injecting epoxy grout.
Problems encountered after construction:
None
