Freezing and sealing device for shield launching tunnel portal

Abstract

The invention discloses a shield launching tunnel portal freezing sealing device, and belongs to the field of shield tunneling machines, the shield launching tunnel portal freezing sealing device comprises a tunnel portal steel ring piece, a folding turning plate, a cord fabric rubber plate and a freezing pipe set, the tunnel portal steel ring piece is prefabricated on a launching tunnel portal of an underground diaphragm wall, and the folding turning plate is arranged on the folding turning plate; a shield tunneling machine and an underground soil layer are arranged on the two sides of the tunnel portal steel ring piece respectively, the tunnel portal steel ring piece and the tunneling axis of the shield tunneling machine are coaxially arranged, the folding turning plate and the cord fabric rubber plate are sequentially fixed to the starting tunnel portal side of the tunnel portal steel ring piece through bolts, and the tunnel portal steel ring piece is sequentially provided with a freezing bin, an air pressure bin and a water pressure bin in the tunneling direction of the shield tunneling machine. The freezing pipe set is arranged in the freezing bin and comprises an annular freezing pipe, the outer side of the annular freezing pipe is sleeved with a pipe sleeve, and the device is particularly suitable for shield tunnel entering and exiting construction of the water-containing stratum with confined water, has market prospects and is suitable for popularization.

Description

technical field [0001] The invention relates to the field of shield tunneling machines, and more specifically relates to a freezing and sealing device for a shield tunnel starting portal. Background technique [0002] The construction technology of the shield tunnel entry and exit involves the design of the working well sealing door, the reinforcement of the soil outside the sealing door, the mechanical performance of the shield and the accuracy of the guiding system, etc., which is a difficult problem in the construction of shield tunneling. For the entry and exit holes of the mud-water balance shield machine, the sealing of the building gap at the hole entrance is a key issue. If it is not properly resolved, it will cause leakage at the hole entrance and subsidence of the ground surface, resulting in unimaginable consequences. When the shield enters and exits the tunnel, the tunnel opening and the shield shell will form a ring-shaped building gap. In order to prevent a la...

AI Technical Summary

Problems solved by technology

The above method relies on the fastening of the "cord rubber plate" and the protection of the one-way hinge plate to prevent the soil outside the cave from being lost into the well, but this cannot completely prevent the seepage of muddy water under pressure, so it is still difficult to avoid seepage with a single sealing device. Occurrence of leakage

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