A construction method for backfilling the piston air duct in the shield section

Abstract

The invention relates to the technical field of metro construction, particularly to a shield interval piston vent backfilling and station passing construction method. The shield interval piston vent backfilling and station passing construction method comprises, after bottom plates of an interval piston vent are constructed, arranging steel supports circumferentially outside a shield range, backfilling modified soil, arranging reinforced concrete sealing plates into the backfilled soil, backfilling soil to reach the underground water level and the like to increase the support stiffness inside the piston vent, balance pressure of water and soil inside and outside pits and ensure structural stability of a foundation pit support; when a shield tunneling machine is passing by, strengthening synchronous grouting for secondary grouting of an out-tunnel sixth ring, and re-grouting the seepage parts of the foundation pit support during backfilled water excavation to seal joints of the foundation pit support and the seams between a tunnel entrance and the foundation pit support and further to ensure subsequent construction safety. The shield interval piston vent backfilling and station passing construction method effectively solves the contradiction between limited construction periods and lagged piston vent construction, avoids the risks of multiple starting and receiving the shield tunneling machine passing through the piston vent, and has the advantages of being reasonable in process, safe, reliable, capable of avoiding stopping of the shield tunneling machine and effectively shortening the construction period and the like.

Description

technical field [0001] The invention relates to the technical field of subway construction, and more specifically, relates to a construction method for backfilling a piston air duct in a shield section. Background technique [0002] With the rapid development of my country's urbanization reduction, the construction of urban rail transit continues to increase. Urban subway construction is affected by many factors such as pipeline relocation, traffic diversion, land acquisition and demolition, and smog control, resulting in tight subway construction schedules. The piston air duct passing station in the shield section is faced with the need for multiple receiving and starting of the shield machine within a short distance, the risk of construction operation is high, the reinforcement space at the end is limited and the reinforcement cycle is long, which brings risks to construction safety. Traditional methods are difficult to meet the requirements of on-site construction. Con...

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Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the present invention provides a construction method for backfilling the piston air duct in the shield section to solve the problem of waiting for the main body of the piston air duct to be completed due to the tight construction period when the piston air duct shield tunnel passes through the station. Problems such as the inability to meet the node construction period and the inability to carry out end reinforcement during shield tunneling

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