Shield tunneling method using flexible segments, flexible segments for shield tunneling method, and flexible segments for secondary application of shield tunneling method

摘要

A general segment 20 which is propelled and set in an excavated hole by a propulsion excavating machine, and a flexible segment where flexible members 4 and rigid ring members are alternately installed and connected inside the skin-plate 7 provided on the outer periphery side of the side rings 5 having the same thickness as the general segment and a thrust- receiving member 9 is provided inside the flexible portion, are propelled and set by the propulsion excavating machine and then secondary coating concrete 30 including a secondary watertight band 15 is applied to said side ring. As a segment for a shield tunneling method, the flexible segment appropriately provides flexibility to quickly cope with earthquakes and uneven settlement. The flexible segment may be handled in the same manner as a standard general segment during excavation work, providing excellent application potential. Furthermore, the elastic and resilient members to provide flexibility are stably secured to connection ring members at both ends, preventing peeling from occurring, and at the same time, generating minimal unreasonable stress, thereby allowing application of excellent durability to be obtained.