Anti-floating ballasting method for shield tunnel under negative earthing condition

A technology of shield tunneling and negative covering soil, which is applied in the direction of tunnels, earthwork drilling, mining equipment, etc., to achieve the effect of simple and practical anti-floating method and reduce the amount of floating

Active Publication Date: 2013-08-14
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

Patent (4) uses lead weights to correct the deflection of the double-circle shield, but when the deflection angle is large, the weight of the lead weight can only correct part of the deflection angle, so it needs to be solved together with the existing technology

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  • Anti-floating ballasting method for shield tunnel under negative earthing condition
  • Anti-floating ballasting method for shield tunnel under negative earthing condition

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0029] Such as figure 1 As shown, this embodiment provides a method for the anti-floating pressure of a shield tunnel under the load-covered soil condition, which is used to establish a three-dimensional finite element model of a shield tunnel. The length of the model is 30m, the width is 70m, and the depth is 24m.

[0030] The specific steps of this embodiment are as follows:

[0031] (1) Aiming at the load and stratum conditions borne by the tunnel segment during actual construction, the finite...

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Abstract

The invention provides an anti-floating ballasting method for a shield tunnel under negative earthing condition. The method includes the steps of firstly, calculating according to borne load and formation condition of a tunnel segment in actual construction by the finite element method to obtain magnitude of ballasting load, with lead blocks as weights for ballasting; secondly, designing the shape of the lead blocks; and thirdly, setting the positions of the lead blocks, namely setting the lead blocks at the anti-floating-required part of the bottom of the tunnel. According to the method, the lead weights are disposed at the anti-floating-required part of the bottom of the tunnel so that the tunnel segment can bear extra weight of the lead weights and floating quantity of the tunnel segment is reduced; the method is simple and practical, and by the method, floating quantity of the tunnel is reduced greatly; and the method is applicable to anti-floating application in shield tunnel construction.

Description

technical field [0001] The invention relates to a construction method in the technical field of tunnel engineering, in particular to a method for resisting buoyancy pressure of a shield tunnel under the load-bearing soil working condition. Background technique [0002] With the development of the city and the congestion of the city, tunnels for various purposes also appear one after another. Under normal circumstances, the shield construction method is used to construct tunnels in densely populated areas. The construction of working wells in traditional shield engineering is indispensable, but the construction of working wells not only consumes a lot of man-hours and funds, but also causes great damage to the surrounding environment. [0003] The shield tunnel without working shaft is a new type of shield tunneling method. Different from the traditional shield tunneling method, it does not require a working shaft, and the shield directly starts and arrives from the ground. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06
Inventor 于亚磊叶冠林王建华
Owner SHANGHAI JIAO TONG UNIV
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