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Construction method of subway shield tunnel crossing prestressed anchor cable

A prestressed anchor cable and construction method technology, applied in tunnels, infrastructure engineering, earthwork drilling and other directions, can solve the problems such as failure to remove the anchor cable, no construction method, few successful cases, etc. It has the effect of mature warehouse opening technology, high implementation efficiency and ensuring construction safety.

Pending Publication Date: 2019-10-25
CHINA CONSTR FOURTH ENG DIV
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AI Technical Summary

Problems solved by technology

In recent years, there have been more and more situations where prestressed anchor cables in foundation pits have invaded shield tunnels. There is still no reasonable and mature construction method for the treatment of anchor cables. The scheme of shaft digging + casing drilling rig extraction is not only low in efficacy, but more importantly, there are quite few successful cases, basically failing to achieve the effect of anchor cable extraction

Method used

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  • Construction method of subway shield tunnel crossing prestressed anchor cable
  • Construction method of subway shield tunnel crossing prestressed anchor cable
  • Construction method of subway shield tunnel crossing prestressed anchor cable

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Embodiment Construction

[0066] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0067] In the description of the present invention, it should be noted that the terms "upper / lower end", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. indicate The orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description,...

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Abstract

The invention relates to the technical field of tunnel construction, in particular to a construction method of a subway shield tunnel crossing a prestressed anchor cable. The construction method comprises the following steps that construction preparation is made before a shield machine crosses the anchor cable, and a bin opening point is preset after the preparation is completed; then a jet grouting pile is used for reinforcement in an anchor cable area; a reinforced soil body for rotary jet grouting reinforcement is tested, after reinforcement meets requirements, shield tunneling is carried out, anchor cable crossing construction is carried out, and shield tunneling parameters are controlled and analyzed in the construction process; according to the excavation parameters, the bin openingpoint opening operation is reasonably selected, the anchor cable wound on a cutter head is removed, or a cutter is replaced; and after the bin opening operation is completed, shield tunneling construction is restored, and finally the shield machine crosses the anchor cable. The construction method is simple in process; the jet grouting pile reinforcement technology and the shield bin opening technology are relatively mature, the implementation efficiency is high, and the construction safety is ensured; and the basis and construction experience are provided for the subsequent process that a shield crosses the anchor cable, the anchor cable treatment success rate is improved, and the construction difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method of a subway shield tunnel through prestressed anchor cables. Background technique [0002] With the rapid development of urban rail transit, the development and construction of underground railways is in a boom period. Shield tunneling is now the main construction method for section tunnels, and the construction technology is becoming more and more mature, but the situation of passing through buildings (structures) in the process of shield tunneling is becoming more and more complicated. In recent years, there have been more and more cases of foundation pit prestressed anchor cables intruding into shield tunnels, and there is still no reasonable and mature construction method for the treatment of anchor cables. The shaft digging + casing drilling rig removal scheme is not only ineffective, but more importantly, there are very few successful case...

Claims

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Application Information

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IPC IPC(8): E21D9/08E21D9/00E02D5/74
CPCE21D9/08E21D9/001E02D5/74
Inventor 康卫刘双红李冬黄志良付小畅
Owner CHINA CONSTR FOURTH ENG DIV
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