method for sealing undichtigkeitsfugen in schildschwanzbereich in schildvortrieb tunnel

摘要

Shield driving method for a tunnel by means of a shield driving machine which has a working chamber under atmospheric pressure, the heading face being supported by means of a pressure medium which is connected via the control gap of the shield to the gap space between shield tail or soil or rock and tunnel lining. The gap space is closed off towards the working chamber between shield tail and tunnel lining by a gap sealing ring. Grouting concrete is injected into the gap space through pipe sockets in the gap sealing ring. For the purpose of closing any possible leakage seam between the gap sealing ring and the shield tail and/or the tunnel lining, work is carried out with a grouting concrete which has fine additives and coarse-grained aggregates such that the coarse grains form a grain filter in front of any leakage seam, the pores of which grain filter are closed by the fine additives. IMAGE