Steel sleeve construction process and assembly method

Abstract

The invention discloses a steel sleeve construction process and assembly method, and relates to the field of shields. The steel sleeve construction process and assembly method comprises a steel sleeve starting construction process and a steel sleeve receiving construction process. The steel sleeve starting construction process comprises the following technological processes of tunnel portal inspection, and matching trolley descending after shielding; transition ring installation; steel sleeve descending circle and reaction frame installation; positioning steel rail and guide rail installation; first-time steel sleeve inner filling; and shield tunneling machine installation in a steel sleeve. According to the steel sleeve construction process and assembly method, twelve 1-inch ball valves 1 and twelve 2-inches ball valve 2 are arranged on a transition ring by 360 degrees, the ball valves are arranged in a crossed mode and used for preventing water burst of a tunnel portal, and the connecting sealing performance is improved; and a water swelling water stop strip is additionally arranged at the joint of the steel sleeve and the tunnel portal, the outer side of the transition ring is coated with polyurethane for reinforcing water resistance, or channel steel is additionally welded for reinforcing, and the connecting sealing performance is improved.

Description

technical field [0001] The invention relates to the field of shield tunneling, in particular to a steel sleeve construction process and assembly method. Background technique [0002] The traditional methods of strengthening the construction end of the shield method include ground stirring, rotary spraying, and grouting, etc., and these reinforcement methods are all used in the subway construction process. [0003] However, in the construction process of some intervals, due to the constraints of geology, hydrology, envelope structure, tunnel depth, special site, owner's construction period and surrounding environment, reinforcement scope pipelines and other conditions, the traditional ground reinforcement method cannot ensure the reinforcement effect and the ground strength. , The permeability cannot meet the safety index, which has buried safety hazards for the shield starting and arriving construction. [0004] Due to the alternating distribution of marine and terrestrial ...

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Problems solved by technology

[0003] However, in the construction process of some intervals, due to the constraints of geology, hydrology, envelope structure, tunnel depth, special site, owner's construction period and surrounding environment, reinforcement scope pipelines and other conditions, the traditional ground reinforcement method cannot ensure the reinforcement effect and the ground strength. , the permeability cannot meet the safety index, which has buried safety hazards for the starting and arriving construction of the shield

[0004] Due to the alternating distribution of marine and terrestrial soil layers along the eastern coast of China, many areas have formed multi-layer aquifers and aquifers in a relatively deep range. The thin layer leads to a certain difference in the horizontal and vertical permeability of the aquifer, and the aquifer may have the problem of leakage between different aquifers, and the hydrogeological conditions are extremely complicated, which leads to the deformation of the steel sleeve device , The connection between the steel sleeve and the pre-buried ring plate of the portal is cracked, and the seal between the steel sleeve and the steel ring of the portal is not good. When the shield is launched and received, the pressure of the steel sleeve will leak, resulting in the imbalance of internal and external water and soil pressure. causing land subsidence

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