Pump Station Chamber Base Repair in Southampton

The problem

A homeowner in Southampton required remedial work on a deep tank chamber that had been left unstable by a previous contractor. The original installation lacked a solid base, which caused the chamber to become unstable and begin rising from the ground.

What we found

The site required immediate attention to prevent further movement of the tank. Before any structural repairs could be attempted, the tank itself and the surrounding ground needed to be completely cleared of water. This was a necessary step to allow safe access into the chamber for the construction work.

What we did

Our team deployed an auger to drill twenty well points just below the base of the tank. Pipework was then installed connecting these points to surface level pumps. These pumps were used to suck the ground water away from the tank, effectively dewatering the site.

The result

The water has now been cleared from the chamber and surrounding area. The team can now enter the chamber to complete the job by laying a solid concrete base. This work is still to be done.

Why it matters

Pump stations are critical infrastructure for moving wastewater and surface water from low-lying areas to higher ground or the mains sewer. When a pump station chamber is installed without a proper foundation, hydrostatic pressure and soil movement can cause the structure to shift or rise over time. This instability compromises the integrity of the pumps, pipework connections, and electrical systems inside.

Dewatering and chamber repairs

When a pump station requires repair but is surrounded by groundwater, dewatering is essential. Engineers use well points to lower the water table around the chamber before work begins. Surface pumps remove the collected water, creating a dry environment for safe access. Once the chamber is dry, engineers can assess the damage and carry out necessary repairs, such as laying new foundations or replacing damaged components.

Pump station repair.