| 摘要 |
PCT No. PCT/EP90/00898 Sec. 371 Date May 4, 1992 Sec. 102(e) Date May 4, 1992 PCT Filed Jun. 8, 1990 PCT Pub. No. WO90/15222 PCT Pub. Date Dec. 13, 1990.A device for opening and supporting a headway in closed or open excavations comprises an envelope composed of blade- carrying heads (24) which can be driven individually or in groups, each connected to an end part. At least several end parts are designed as internal formwork sections (12) and their top surface facing the ground or soil (26) slopes backward from the corresponding top surface (38) of the corresponding blade-carrying head. The blade-carrying head (24) and the end parts are supported and guided on supporting frames (16) of a walking frame (34). A filling tube (42) for introducing supporting material (44) and binders is arranged in the region between the blade-carrying head (24) and the sections (12) of the internal casing.
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