Shield machine reaching receiving method under working condition of short reinforced area in water-rich soft soil stratum

Abstract

The invention relates to a shield machine reaching receiving method in a water-rich soft soil stratum, in particular to a shield machine reaching receiving method under the working condition of a short reinforced area in the water-rich soft soil stratum. The problems that the shield machine receiving risk under the water-rich soft soil environment is large, and particularly, the longitudinal reinforcing length of the reinforced area is large are solved. The shield machine reaching receiving method comprises the steps that 1, foundation reinforcing treatment is conducted on the interval receiving end in the water-rich soft soil stratum, and a second reinforcing body is arranged between a first reinforcing body and an underground diaphragm wall; 2, a steel sleeve is mounted; 3, by detectingthe situations of water leakage and sand gushing in prospecting holes, concrete of the tunnel portal underground diaphragm wall is chiseled away firstly, then concrete, inside a confined-water-containing layer, at the bottom of a tunnel portal is chiseled away, mortar is poured at the bottom, and then the surplus tunnel portal underground diaphragm wall is continuously chiseled away; and 4, mortarpacking is injected into the steel sleeve, and a shield machine tunnels into the steel sleeve and stops. The formed reinforced area only needs the longitudinal reinforcing length of 3-5 m, costs of pipeline cutting and transforming, land requisition and demolishing, tunnel occupying for tunneling and the like can be saved, and the invest cost is greatly saved accordingly.

Description

technical field [0001] The invention relates to an arrival and reception method of a shield machine in a water-rich soft soil stratum. Background technique [0002] At present, shield tunneling reception in urban subway projects in my country mostly adopts one-time reception, two-time reception or even multiple reception methods. That is, first construct a certain length of soil reinforcement area at the receiving end of the shield, stop the excavation when the shield cutter head passes through the reinforcement area and reaches the portal, then manually chisel out the enclosure structure of the portal, and finally inspect the water situation at the portal One or more arc-shaped steel plates are welded at the place and double-slurry is injected to seal the door to complete the receiving of the shield tunnel. [0003] In actual construction, this receiving method is greatly restricted by the surrounding environment and underground pipelines, and the risk of water and sand le...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the risk of receiving shield tunneling in water-rich soft soil environment, especially the long longitudinal reinforcement length of the reinforcement area, which is easily affected by underground pipelines or surrounding buildings, and the longitudinal reinforcement length that does not meet the design requirements and water leakage In order to solve the problem of increased risk of sand leakage, a shield arrival and reception method is provided under the condition of short and medium reinforcement zones in water-rich soft soil strata

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