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Soft soil foundation shield tunnel subsidence control structure and use method

A technology for shield tunneling and settlement control, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve problems such as hidden dangers in normal operation and damage to tunnel linings, so as to overcome the large grouting range, enhance the overall strength, and control tunnel settlement Effect

Pending Publication Date: 2018-11-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a soft soil for the excavation of shield tunnels on soft soil foundations where the gravity of the soil is less than the gravity of the tunnel shield segment, which causes the subsidence of the tunnel, damages the tunnel lining, and brings hidden dangers to normal operation. The subsidence control structure of the foundation shield tunnel can control the subsidence of the tunnel by setting tie rods on the tunnel vault to pull the tunnel segments in the soil. Effect

Method used

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  • Soft soil foundation shield tunnel subsidence control structure and use method
  • Soft soil foundation shield tunnel subsidence control structure and use method
  • Soft soil foundation shield tunnel subsidence control structure and use method

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Embodiment 1

[0036] This embodiment provides a settlement control structure of a shield tunnel on a soft soil foundation;

[0037] Such as Figure 1-Figure 4 As shown, the settlement control structure of shield tunneling on soft soil foundation in this embodiment includes tunnel lining segments 5, pull rods 2 arranged radially along the segments, and anchor plates 1 arranged in the soil above the tunnel vault, A steel backing plate 3 is provided on the inner wall of the tunnel vault segment. The steel backing plate 3 has the same curvature as the segment 5. One end of the tie rod 2 is connected to the steel backing plate, and the other end passes through the reserved hole of the segment and the soil. The back of the body is connected with the anchor plate 1.

[0038] In the present invention, a steel backing plate is arranged on the inner wall of the tunnel vault segment. Since the curvature of the steel backing plate and the segment is consistent, the steel backing plate and the segment ...

Embodiment 2

[0047] This embodiment provides a method for using a settlement control structure of a shield tunnel on a soft soil foundation;

[0048] Such as Figure 1-Figure 4 As shown, the method for using the settlement control structure of the soft soil foundation shield tunnel in this embodiment includes the following steps:

[0049] a. Prefabricate segment 5, steel backing plate 3 and anchor plate 1 and reserve tie rod holes, make tie rod 2 and carry out anti-rust treatment. The segment is made of reinforced concrete and formed by high-precision steel molds. The top segment is reserved with corresponding tie rod holes with a diameter of 15-25mm; the steel backing plate is pre-bent by ordinary steel sheets, with tie rod holes reserved and The size of the hole is the same as that of the segment opening, and the curved shape can fit closely with the segment; the anchor plate is a prefabricated reinforced concrete plate, and a tie rod hole is reserved, and the shape and size of the anch...

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Abstract

The invention discloses a soft soil foundation shield tunnel subsidence control structure and a use method. The soft soil foundation shield tunnel subsidence control structure comprises a tunnel lining segment, pull rods and an anchor plate, wherein pull rods are arranged in the radial direction of the segment, the anchor plate is arranged in a soil body above a tunnel vault, a steel cushion plateis arranged on an inner wall of a segment of the tunnel vault, the curvature of the steel cushion plate and the curvature of the segment are the same, one end of each pull rod is connected with the steel cushion plate, and the other end of each pull rod penetrates through a segment preformed hole and the soil body to be connected with the anchor plate. According to the soft soil foundation shieldtunnel subsidence control structure disclosed by the invention, the steel cushion plate is arranged on the inner wall of the segment of the tunnel vault and can be very well attached to the segment to form an integrated stress system, so that the whole tunnel strength is enhanced, and tunnel difference subsidence is controlled; the segment of the tunnel vault and the anchor plate are connected through the pull rods; when the segment sinks, the anchor plate can draw the soil body under the segment to sink jointly, and upward resistance is generated; if the tunnel continues sinking, the soil body under the anchor plate needs to be drawn again to sink jointly; thus, the tunnel subsidence volume is reduced, and the purpose of controlling the tunnel subsidence is achieved.

Description

technical field [0001] The invention relates to the field of shield tunnel construction, in particular to a settlement control structure and a use method of a shield tunnel on a soft soil foundation. Background technique [0002] With the development of urban transportation, the subway has gradually gained the attention of major cities. During the construction of the subway, many shield tunnels will pass through weak ground. In weak strata, the soil reaction force at the bottom of the tunnel is always less than the original soil self-weight pressure when the tunnel is not built, and the compression modulus of the soil in the lower part of the tunnel decreases. The secondary consolidation will go on for a long time, and the resulting settlement cannot be underestimated. If diseases such as differential settlement gradually occur during the operation period of the subway tunnel, disasters such as bending failure, bending tension, extrusion shearing, and longitudinal fracture...

Claims

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Application Information

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IPC IPC(8): E21D11/08
CPCE21D11/08
Inventor 李雪霍鹏张军伟黄琦周双禧
Owner SOUTHWEST PETROLEUM UNIV
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