Starting tunnel portal sealing structure for slurry balance shield and construction method

Abstract

The invention discloses a starting tunnel portal sealing structure for a slurry balance shield and a construction method. The sealing structure comprises a primary water stop ring, a secondary water stop ring, a tail end water stop ring and a tunnel portal ring, the tunnel portal ring is fixed to the outer side of a working well lining, the upper end of the primary water stop ring and the upper end of the secondary water stop ring are connected with the tunnel portal ring. The primary water stop ring is located at a tunnel portal, the secondary water stop ring is located on the outer side of the primary water stop ring, and the tail end water stop ring is located on the outer side of the secondary water stop ring and connected with the tail end of the tunnel portal ring. According to the starting tunnel portal sealing structure for the slurry balance shield and the construction method, two flexible closed bins are formed through the primary water stop ring and the secondary water stop ring, and the problems of water seepage and slurry leakage of a tunnel portal during starting of the slurry balance shield are solved to a certain degree; a third rigid closed bin is formed through the tail end water stop ring, a complete closed space is formed, and the problems of the water seepage and the slurry leakage of the tunnel portal are effectively solved.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a starting tunnel opening sealing structure and a construction method for a mud-water balance shield. Background technique [0002] In the field of civil engineering, shield machines are often used for tunnel excavation. Shield machines can be divided into hand-dug shields, extrusion shields, semi-mechanical shields, and mechanical shields. Most of them are used in cities. It's a mechanical shield. Mechanical shields can be divided into pneumatic shields, mud-water balance shields, earth pressure balance shields, and hybrid shields. The mud-water balance shield is a shield machine that balances the water and soil pressure on the face by controlling the pressure of the mud-water tank. It is suitable for geological conditions with large groundwater pressure and large soil permeability coefficient. construction. [0003] For the mud-water balance shield, in order to mai...

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Problems solved by technology

[0005] Based on this, there is an urgent need to provide a sealing structure and construction method for the tunnel opening of the mud-water balance shield, which can solve the problem of the sealing of the mud-water balance shield starting at the tunnel opening

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