ABSTRACT
Tunnelling projects require shafts, either as start and reception shafts for the tunnelling process or for inspection, ventilation and rescue purpose. Inner-city shaft structures demand safe working principles. The Vertical Shaft Sinking Machine method procures safety for the surrounding environment and for all personnel. As the water level in the shaft equals the groundwater level outside the shaft, there is no water flow which can cause ground movement. All installations including the lining erection are completed from the surface. No personnel have to enter the shaft until it has reached the final depth and is fully secured. The lining consists of either precast segments or cast in place concrete. As the lining installation is completed on the surface, a high quality installation can be reached. This paper will describe the role of shaft sinking in tunnelling projects along with all necessary safety and planning aspects.
