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Segment structure for preventing upward floating of shield tunnel and construction method of segment structure

A technology for shield tunneling and construction methods, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as the longitudinal axis of the tunnel does not meet the design requirements, partial or overall floating, and deviation from the design axis, etc., to achieve a simple and effective structure, The effect of avoiding pressure instability and reducing the effective length

Active Publication Date: 2019-07-05
THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the shield tunnel passes through the shallow overlying soil layer across the river section, when the sum of the vertical earth pressure and the force generated by other effects such as the self-weight of the segment is not enough to offset the buoyancy acting on the segment, for the segment that has just left the shield tail, Partial or overall floating phenomena often occur, resulting in segment misalignment and damage, and the longitudinal axis of the tunnel does not meet the design requirements
In addition, during the propulsion process of the shield machine, due to the gap between the segment ring and the initial support structure of the tunnel, the assembled segment ring will inevitably deviate upward from the design axis under the action of buoyancy formed by grouting at the back

Method used

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  • Segment structure for preventing upward floating of shield tunnel and construction method of segment structure
  • Segment structure for preventing upward floating of shield tunnel and construction method of segment structure
  • Segment structure for preventing upward floating of shield tunnel and construction method of segment structure

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specific Embodiment approach 1

[0022] Specific implementation mode one: as Figure 1~Figure 4 As shown, the present invention discloses an anti-floating segment form of a shield tunnel, which includes a plurality of segment ring units 1, and the plurality of segment ring units 1 are arranged in sequence along the extending direction of the shield tunnel 5, each The segment ring unit 1 is assembled and enclosed by a plurality of segments 2, and one of the segments 2 is used as a capping segment 2-1, and the capping segment 2-1 is provided with a grouting hole , the segment 2 is made of steel skeleton and high-strength anti-seepage prestressed concrete to ensure reliable load-carrying and waterproof performance, and every other segment ring unit 1 capping segment 2-1 is installed with two anti-floating Sheet 3, the two anti-floating sheets 3 are arc-shaped sheets and are symmetrically arranged on the top of the capping segment 2-1 along the vertical central axis of the corresponding segment ring unit 1, the c...

specific Embodiment approach 2

[0023] Specific implementation mode two: as figure 1 As shown, this embodiment is a further description of specific embodiment 1. The support screw 4 is arranged radially along the corresponding segment ring unit 1, and the capping segment 2-1 corresponding to the support screw 4 is pre-embedded and fixed with threads The casing, the support screw 4 is screwed to the threaded casing, the threaded casing should be welded and fixed with the steel skeleton in the capping segment 2-1 as a whole, and the inner surface of the anti-floating sheet 3 corresponding to the outer end of the support screw 4 is recessed There is a top groove, and the outer end of the support screw 4 is supported in the top groove. It is advisable to set two support screws 4 for each anti-floating piece 3, and the corresponding capping segment 2-1 is evenly pre-embedded and fixed with four threaded sleeves .

specific Embodiment approach 3

[0024] Specific implementation mode three: as figure 1 As shown, this embodiment is a further description of the second specific embodiment. The support screws 4 of the two anti-floating sheets 3 are symmetrically arranged one by one along the vertical central axis of the corresponding segment ring unit 1, and each symmetrical The angle between the two supporting screw rods 4 is α, and α is 60°.

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Abstract

The invention relates to a shield segment and a construction method thereof, in particular to a segment form for preventing upward floating of a shield tunnel and a construction method of the segmentform. A plurality of segment ring units are sequentially arranged in the extending direction of the shield tunnel, and each segment ring unit is formed by a plurality of segments which are spliced andenclosed, wherein one of the segments serves as a top sealing segment; and the top sealing segments are provided with grouting holes correspondingly, and two anti-floating pieces are mounted every the top sealing segment of the corresponding segment ring unit correspondingly, wherein the two anti-floating pieces are each in an arc shape and are arranged above the top sealing segment along the vertical central axis of the corresponding segment ring unit in a bilateral symmetry mode, the inner surfaces of the two anti-floating pieces face the corresponding top sealing segment, and the two anti-floating pieces are connected with the corresponding top sealing segment through one or more supporting screws, wherein the supporting screws and the corresponding top sealing segment are in screwingfit, and the outer ends of the supporting screws are in supporting fit with the corresponding anti-floating pieces. The anti-floating pieces act on a tunnel initial lining, the constraint effect is generated, upward floating of the segments is effectively controlled, and easiness and effectiveness are achieved.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling segments and construction thereof, in particular to a segment structure for preventing floating of shield tunneling and a construction method thereof. Background technique [0002] The shield method is a fully mechanized construction method in the underground excavation method. It propels the shield machine in the ground, supports the surrounding rock through the shield casing and segments to prevent collapse into the tunnel, and at the same time excavates the soil with a cutting device in front of the excavation face, and transports it out through the excavation machine. Outside the tunnel, it is a mechanized construction method that jacks are used to pressurize the rear part of the tunnel and assemble precast concrete segments to form a tunnel structure. [0003] When the shield tunnel passes through the shallow overlying soil layer across the river section, when the sum of the vertica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/08E21D9/06E21D11/10
CPCE21D9/0607E21D11/08E21D11/083E21D11/10
Inventor 孔祥勋赵香萍唐亮凌贤长蒋言佳乔国强刘创印赵策邓长飞石强徐加飞姚前伟
Owner THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY
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