A anti-seepage structure and construction method of smw construction method pile shield portal

Abstract

The invention provides an SMW pile shielding portal waterproof structure and a construction method thereof. The waterproof structure includes the construction steps that after construction of the portion, corresponding to a shielding portal, of a station main structure is finished or construction of the whole station main structure is finished, a double-layer reinforced rib net piece is welded to the inside of a steel ring of a portal, molding is carried out, concrete is poured through a pit pump to form a temporary blocking wall, when the station main structure and the temporary block wall reach designed strength, the portion, corresponding to the shielding tunnel portal, of an SMW pile is drilled along an H-type steel wall face, a polyvinyl chloride plastic sleeve valve pipe is inserted into the hole, and when H-type steel on the portion is pulled out, cement grout is injected into the H-type steel insertion hole synchronously while a sleeve valve pipe grouting process is used, so that a cement filling layer is formed. The structure is simple and convenient to construct, can well prevent a water leaking phenomenon of the shielding tunnel portal and reduces the safety risks caused when a shielding machine goes in and out of a tunnel, the renting cycle of the H-type steel of the SMW pile is shortened, and construction cost is saved.

Description

technical field [0001] The present invention relates to the anti-leakage technology of the entrance of the shield tunnel in the soft soil layer, in particular to an anti-seepage structure and its construction for the reinforced anti-seepage structure of the shield tunnel entrance when the SMW construction method pile is used as the enclosure structure of the end well of the shield tunnel method. Background technique [0002] The SMW construction method pile is a composite soil retaining and water-stop structure formed by inserting section steel into the continuously socketed three-axis cement-soil mixing pile. The original soil is reinforced once to form a wall. The construction process is simple and the construction period is short. Under the premise that the enclosure itself costs only 70% of the underground diaphragm wall, if the recovery of section steel is considered, the cost can be reduced to less than 60%. Although the shaped steel cement-soil mixed wall has good ec...

AI Technical Summary

Problems solved by technology

[0004] The present invention is based on the existing subway foundation pit SMW engineering method pile foundation pit enclosure structure, shield tunnel end well reinforcement, the gap treatment method between the reinforcement body and the enclosure structure, and the leakage water after the H-shaped steel of the SMW engineering method pile is pulled up and recovered. To solve the problem, provide an improved SMW construction method pile shield tunnel door anti-seepage structure and its construction method

Images