| 摘要 |
PURPOSE:To simplify the constiturion of the whole erector and to speed up work by assembling the central part of a segment with a rotatable erector, and assembling both ends thereof with a liftable erector to construct the segment in the case of the lining of a tunnel having a horizontal and rectangular section. CONSTITUTION:Up and down segments S1 and S2 of the central part having a horizontal and rectangular section are assembled with a turnable built-up device (erector) 12, and segments S3 and S4 on both sides outside the limits of the working are assembled with a liftable erector 13 through a guide strut 31. With the excavation of a tunnel, both erectors 12 and 13 are used together and are operated to construct a segment S. According to the constitution, the erectors are simplified respective, the constitution of the whole device is simplified and, at the same time, built-up work can be speedingly carried out. |
