Tunnel Rehabilitation projects provide a unique set of challenges. We've worked on some unique tunnel projects over the years from Smithers BC, to the Yukon. Here are a few of them:
Project: Tom Mine Tunnel Plug & Grouting
Location: Tom Mine, Yukon
Duration: May to September, 2010
Installation of a 150 cubic metre concrete plug 100 metres into the tunnel, as well as drilling and grouting of the concrete plug. This project required installation of tunnel formwork bulkheads, concrete plug piping, shotcrete formwork and the pumping and placing of 150 cubic metres of concrete.
Project: Ashlu Tunnel
Location: Squamish, BC
Duration: May to October 2009
Steel formwork was installed to a 3 metre diameter penstock pipe as well as the application of concrete in place around the pipe within the hydro tunnel 60 metres from the tunnel portal. The unique nature of the project provided our team with a challenge. Grouting of the plug was done by rock drilling from the inside of the steel pipe through pre-installed drilling ports. A total of 18 holes were drilled to a depth of 10 metres and grouted with microfine grout to pressures of up to 30 bar.
Project: BC Northline Tunnel Clearance Improvement Project
Location: Smithers, BC
Duration: June to November, 2008
For this project we designed and procured a custom grout mixing and pumping system to fit the project needs. We then installed the specialized equipment onto rail cars in order to carry out core drilling through the tunnel concrete lining and mixed and pumped 1.2 million litres of grout. To finish off, we applied dry shotcrete repairs to the tunnel lining and portals.