METHOD OF STARTING SHIELD MACHINE FOR TUNNEL CONSTRUCTION METHOD

摘要

A method of starting a shield machine for a tunnel construction method for constructing a tunnel passing under a road etc., where the construction is made by digging the ground by using the shield machine and segments are sequentially laid at the dug places while the digging is made. A ground level start section (1) is provided at a section functioning as an approach to a tunnel, and reaction force means (4) for receiving a reaction force occurring when the shield machine (20) starts is placed on the ground (2) where the ground level start section (1) is. The reaction force means (4) is a foundation (5) placed on the ground (2) of the ground level start section (1), and the foundation (5) is constructed from a reaction force reception base (6) for receiving a reaction force occurring when the shield machine (20) starts and a start reception base (11) for supporting the weight of the shield machine (20) when it starts. The reaction force reception base (6) and the start reception base (11) are supported by piles (14) driven in the ground (2) and prevented from sinking by the weight of the shield machine (20).