Lift Station Slab Stabilization
When two separate attempts to seal water infiltration into a lift station failed using other technologies, the Toho Water Authority called on URETEK Holdings to utilize its Deep Injection technology as a final solution.
Prior to installation of the injection tubes, the Toho staff and the crew at Ground Penetrating Radar Services (GPRS), assisted in identifying the location of buried service connections so they wouldn’t be impacted during the repair. The URETEK Team then hydro-lanced through the first ten feet of soil using this “soft” driving technique to avoid damage to underground utilities within the injection zone.
The repair commenced with installation of injection tubes using surgical precision to apply URETEK’s 486STAR polymer directly to the problem zones, which were located at the pre-cast structure’s horizontal joints.
Injection points were spaced at pre-determined intervals and elevations to coincide with the lift station’s failed seals. A total of eighteen locations were equally spaced around the circumference of the lift stations with the 486STAR polymer injected at three discrete elevations. The injection process was closely monitored to prevent unintentional lift at the surface or damage to the buried service connections.
Steven Gibbs, URETEK’s project manager on the job, reported that the team successfully completed the project in one work shift, without impact to the buried service connections, all while working in tight quarters and keeping the lift station in continuous service.