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Method for correcting unconformable surface stratum shield tunneling construction

A technology of shield tunneling and formation, which is applied in the field of deviation correction for shield excavation in unconformity ground, which can solve the problems of affecting normal traffic, long construction period, and difficult deviation correction, so as to improve the flexibility of deviation correction, reduce the pressure difference of deviation correction, and improve the flexibility Effect

Active Publication Date: 2015-03-18
2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

[0004] The present invention provides a method for correcting deflection of unconformity stratum shield tunneling construction in order to solve the problems that it is not easy to rectify the deflection using the existing method of unconformity stratum shield tunneling, and the mining method has long construction period and affects normal traffic.

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  • Method for correcting unconformable surface stratum shield tunneling construction

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[0034] There is a 50-meter rock stratum in the receiving section of Changsha Metro Line 1, Bid 10, from Zhongxin Plaza Station to Datuo Station, which is an unconformity stratum. When the shield tunneling on the left line is excavated, the posture is offset along the slope, and the trend of offset is becoming more and more serious by conventional methods. . The deviation trend was reduced after replacing the peripheral excavation knife, but the deviation could not be corrected. The continuous injection of high-pressure water with dispersant in the radial grouting hole of the shield body on the side of the shield body deviation can realize the containment of the shield body posture, but the deviation cannot be reduced. The deviation correction of the shield machine reduces the situation that the shield machine is shut down and changed to the mining method, and realizes the continuous tunneling of the shield machine to complete the construction task of the interval. It proves t...

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Abstract

The invention relates to the technical field of tunnel shield construction, in particular to a method for correcting the unconformable surface stratum shield tunneling construction, and solves the difficult problems of difficulty in correction, long construction period, influence on normal traffic and the like of an existing method. The method comprises the following steps of: enlarging a shield excavation diameter; when shield posture deviation exceeds 5cm, injecting high pressure water with a dispersing agent from a radial grouting hole of a middle shield at the deviated side of a shield body; and when the shield body is deviated by 10cm, constructing a grotto in the deviation reverse direction of a cutter head on an excavation face, adding an auxiliary oil cylinder behind a shield tail at the deviated side of the shield, starting a driving oil cylinder to recover tunneling, and when the driving oil cylinder drives for 30cm every time, pouring polyurethane by the radial grouting hole of the middle shield at the deviated side of the shield. Flexibility of shield posture correction is improved; the rate of shield posture deviation is reduced; the grotto is constructed in the reverse direction of the shield deviation; a correction space is provided; the polyurethane is poured by the radial grouting hole of the middle shield so as to implement forced correction; the method has the advantages of simple process, flexibility for controlling the construction process, advanced technology and the like and excellent economic benefits and social benefits can be obtained.

Description

technical field [0001] The invention relates to the technical field of tunnel shield construction, in particular to a deviation correction method for shield excavation construction in unconformity surface strata. Background technique [0002] With the rapid development of subway rail transit, the proportion of shield construction in interval tunnels has exceeded 90%. However, the complex strata of a certain period are missing between successively deposited strata, resulting in the discontinuity of the age of the upper strata. , there is an unconformity surface between the upper and lower strata, there is a certain angle between the unconformity surface and the tunnel, and the strength difference between the upper and lower strata makes it difficult to control the posture of the shield. No matter how it is controlled, the shield posture will still deviate along the unconformity surface during excavation. [0003] During construction, due to the particularity of the unconf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/093
Inventor 王宗勇雷军毋海军赵香萍王光锐田晓峰
Owner 2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP
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