The works on the Slip and Bank Stabilisation Rock Cuttings project included the following key elements:
- Pavement and pre-existing assessment condition survey;
- Surface drainage;
- Supply and installation of rock fall fencing;
- Supply and installation of rock mesh fencing;
- Spot rock bolting;
- Selective rock scaling;
- Vegetation removal;
- Traffic management; and
- Sundry minor works.
This project involved slip and batter stabilisation and associated works at 5 sites:
- Southern Outlet Highway, The Lea.
- Southern Outlet Highway, Tolmans Hill.
- Gordon River Main Road, National Park.
- Tasman Highway, Rocky Hills, Glamorgan Spring Bay.
- Midland Highway, Launceston.
The Slip and Bank Stabilisation Rock Cuttings project involved fitting rock fall catch systems (fences and mesh) to various cliff faces and cuttings around Tasmania. The client signed VEC up to a concise 8 week contract, to finish 5 different sites before the end of June 2015.
The work to fit the fences and mesh was challenging due to limited access. The team had to drill hundreds of 1.5m deep drill holes for anchors in broken rock, at height on steep cliff faces; all while under heavy traffic.
As the program schedule was tight, and to ensure a timely completion, VEC called on all areas of expertise within the team to complete the project on time.
A couple of expert Mancala Mining Division rock drillers were called in for a week to “break the back” of the drilling (including 8-time Tasmanian rock drill champion and his teammate). The VEC crew oversaw the drilling, blow-out and grouting of the 350 anchor bars across the sites.
Although the experienced drillers bore holes fast, the VEC team were able to give them a run for their money, using some technology developed by VEC that was fitted to various plant, including a hi-rail excavator.