Difficult Gas Station Tank Upgrade

Dated: September 2016 Display all Projects
Principal: BP
Customer: Fuel Installations Ltd
Location: Hillsborough, Auckland
Product: Slide Rail

To install this tank an open pit was required 17m long x 4m wide x 4m deep. TSNZ came up with a solution using a combination of Single corner slide rails and parallel slide rails.

4 x 4m modules were installed progressively. 610UB waler beams were attached to the outside of the rails and 100x100 SHS props were placed in the base of the excavation at each pair of slide rail posts to ensure no movement after transverse frame removal. Because of the length of this excavation, TSNZ made sure there was additional support for the walers by the installation of deadman anchors at the mid point and a few metres away from the excavation.


Once fully installed, the slide rail transverse frame assemblies were removed to provide a completely open pit to enable installtion of the new tank together with ground anchors. Once the tank was inplace temporary adjustable struts were installed at each pair of parallel slide rails. This was to enable the safe removal of the waler beams.

 Extraction of the shoring system was a staged process. Slide rail posts were left in place as the panels were progressively raised as the backfill was placed. Eventually, the panels were removed, the temporary struts taken out and each post easily extracted.

Follow Us on Facebook


  • Coming Soon!

    Big news - 6m long slide rail panels are on there way to NZ.


  • Did you know that there are regulations that apply to excavations over 1.5m deep
    Are you at risk of breaching them?

    We can help!