We are on site before, during and after the extensive work under ground.
Before tunnelling work can begin, four shafts are constructed to enable preparation of the crew and the extremely heavy drill for the challenging work. However, these shafts do not merely provide access routes for the crew and tunnel boring machine. They also help ensure the health and safety of anyone working in the drilling area. The shafts are deep and narrow, and they must be able to withstand invasive working methods and extreme pressure on their walls from the surroundings. Therefore, the contractor is required to work to high standards when constructing these.
As a provider of surveying and land management services, we contribute to this process by setting out and performing as-built inspections of the shafts’ secant walls, sheet piling walls and jet grout piles. Our as-built documentation provides the data on which inspection of the finished shafts is based, to ensure that they are constructed as required before drilling work begins.