In 2013, Power System Services were awarded a contract to manufacture and deliver numerous temporary propping systems, which once installed provided support to previously driven east and west bound tunnel walls whilst interlinking cross passages were constructed. Power System Services provided technical and logistical support to this project. We provided advice on layout, feasibility, anchorage and visibility to ensure that the installation was easy and safe to install plus did not introduce a risk whilst in place. The main design characteristic of all propping frames was a large heavy section fabricated channel located above and below the cross passage location, fixed to the tunnel pre-cast segments using large grouted bolts. In turn these large channels were supported b

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