Double-layer steel plate sandwich water stopping device for shield tunneling in pressure-bearing water-rich sand-containing layer

Abstract

The invention relates to a double-layer steel plate sandwich water stopping device for shield tunneling in a pressure-bearing water-rich sand-containing layer. The device comprises two annular steel plates and a high-density sponge, wherein the two annular steel plates are welded on the inner side of a tunnel door steel ring, a groove is formed, and the high-density sponge is placed in the groove;in each annular steel plate, long slits with the length of 160 mm and the width of 3 mm are cut along an inner arc side every 200 mm in the diameter direction, and the long slits in the front and rear annular steel plates are staggered from each other and arranged in a plum blossom shape; the two annular steel plates are perpendicular to the inner side of the tunnel door steel ring and are fixedby a triangular support steel plate in an opening direction. The use of the double-layer steel plate sandwich water stopping device well blocks a gap between the tunnel door ring and a shield machine,and effectively prevents the leakage of groundwater and flowing sand along a shield casing during tunneling.

Description

technical field [0001] The invention relates to a water stop device when a shield tunnel enters a hole, in particular to a water stop device suitable for a shield tunnel entry in a pressurized water-rich sand-bearing layer. Background technique [0002] The shield method is commonly used in the construction of urban rail transit. With the rapid development of rail transit in recent years, the depth of the station is getting deeper and deeper. The expected water-stop effect cannot be achieved in the pressurized aquifer, and the most common risk is water gushing and sand gushing at the entrance of the cave. [0003] Aiming at the risks existing in the tunnel entry of the shield machine in the pressurized water-rich sand layer, the present invention effectively blocks groundwater and quicksand, reduces the construction risk during the tunnel entry process of the shield machine, and prevents water gushing during the tunnel entry process , Sand gushing incident. Contents of th...

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Problems solved by technology

[0004] In order to solve the problem of groundwater or quicksand pouring into the working well from the gap between the shell of the shield machine and the steel ring of the tunnel door in the pressure-bearing water-rich sand layer of the shield machine, the present invention provides a pressure-bearing water-rich sand layer for Double-layer steel plate sandwich water-stop device for shield tunneling in water-bearing sand layer

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