Construction method for putting tunnel shield into hole in special stratum

A construction method and shield tunneling technology, applied in the direction of earth drilling, mining equipment, tunnels, etc., can solve problems such as subsidence, ground subsidence, influx, etc., and achieve the effect of reducing soil loss and controlling ground subsidence

Inactive Publication Date: 2010-03-03
SHANGHAI MECHANIZED CONSTR GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the soil quality in the shield tunneling area is poor or the sand content is high, water gushing

Method used

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  • Construction method for putting tunnel shield into hole in special stratum
  • Construction method for putting tunnel shield into hole in special stratum
  • Construction method for putting tunnel shield into hole in special stratum

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Embodiment Construction

[0024] The present invention is suitable for tunnel excavation construction in areas where the geology is relatively poor, such as sandy silt, sandy soil, etc.

[0025] First, before the shield enters the hole, retest the axis of the shield several times to make it conform to the design axis, and recheck the opening, and then make the shield gradually approach the opening. According to experience, the tip of the shield basically touches the ground continuously. The head of the shield machine has stopped on the reinforced soil, and the double liquid grout is injected into the outer soil layer from the grouting holes of the first to second ring segments behind the shield tail, in order to cut off the special soil layer. The water rushes to the front door, commonly known as the first hoop water retaining ring, which also plays a role in controlling the settlement of the tunnel. The underground continuous wall concrete with a thickness of 650mm to 700mm inside the steel ring of the...

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Abstract

The invention relates to a construction method for putting a tunnel shield into a hole in a special stratum, which is characterized by comprising the following steps: before putting the tunnel shield into the hole, approaching the tunnel shield to a tunnel portal gradually; injecting a bi-liquid grout into a soil layer of an external layer; chiseling off thick underground continuous wall concretein a steel ring of the tunnel portal; performing ground vertical sectional probe hole detection; welding a prepared double-layer spring steel plate on the steel ring of the tunnel portal; arranging ahole-entering device on the outer side of the steel ring of the tunnel portal; cutting internal arranged steel bars of an underground continuous concrete wall; pushing the tunnel shield into the holewithout a concrete protective layer; and injecting the bi-liquid grout again at a seam between reinforced soil and unreinforced soil bodies, wherein when the tunnel shield is put into the hole, the double-layer spring steel plate and the hole-entering device are clung to the shell of a tunnel shield machine, the tunnel shield is not pushed when the head of the tunnel shield machine enters a rubber cord fabric board, and a single fluid or the bi-liquid grout is injected into the soil layer of the external layer for replenishing grout. The construction method has the advantages of ensuring thatthe tunnel shield is safely put into the hole in the special stratum, reducing the soil loss, controlling land subsidence well and effectively protecting underground pipelines at the hole-entering part by adopting an internal and external combination measurement.

Description

technical field [0001] The invention relates to a construction method for shield tunneling in a special formation. Background technique [0002] With the rapid development of economy and society, Shanghai's rail transit construction is also developing continuously and deeply. The climax of a new round of rail transit construction will inevitably bring a series of problems, especially the problem of shield tunneling will gradually be paid attention to. Under the soft soil foundation in Shanghai, the soil layer where the shield tunnel is located is complex, and the tunnels of many tunnels are buried in shallow soil. The soil layer has poor geological conditions, high water content, and low strength. It is prone to flow under certain dynamics. Changes, damage the main structure, and suddenly reduce the strength of the soil, resulting in water leakage and sand inrush, etc., resulting in increased ground settlement, and in severe cases, it will cause ground subsidence and damage...

Claims

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Application Information

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IPC IPC(8): E21D9/06
Inventor 金福强王恺华沈得发蔡国良
Owner SHANGHAI MECHANIZED CONSTR GRP
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