Unlock instant, AI-driven research and patent intelligence for your innovation.

A short-term active reinforcement method for segment joints of subway shield tunnels

A technology of tunnel segment and subway shield, which is applied in tunnels, tunnel linings, underground chambers, etc., to achieve the effect of convenient loading and unloading, not occupying tunnel space, and simple operation

Active Publication Date: 2016-01-06
SOUTH CHINA UNIV OF TECH
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many studies on the use of shape memory alloys to repair civil engineering structures or reduce structural deformation. Memory alloys are used in underground structures, such as related research on subway shield tunnel segments

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A short-term active reinforcement method for segment joints of subway shield tunnels
  • A short-term active reinforcement method for segment joints of subway shield tunnels
  • A short-term active reinforcement method for segment joints of subway shield tunnels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] figure 1 and figure 2 What is shown is two segment joints composed of a capping block and two adjacent blocks. In this embodiment, only one segment joint consisting of the capping block 1 and one of the adjacent blocks 2 in the lining ring is reinforced. The shield tunnel The shield segment is based on the shield segment of the shallow buried layer of Shanghai Metro Line 13. The angle of the central angle of the capping block and the adjacent block is 22 degrees, the width is 1.2m, the thickness is 0.35m, the inner diameter is 5.5m, and the outer diameter is 6.2m. , the segment material is C55 concrete; the joint between the capping block and the adjacent block uses two connecting steel bolts, the connecting steel bolts are 5.8 grade, 30mm in diameter, and 485mm in length; the shape memory alloy bolts are 30mm in diameter, 490mm in length, and the shape memory alloy The end temperature of martensite transformation is 5.27°C, the start temperature of martensite transfo...

Embodiment 2

[0038] Compared with Example 1, this example is only different in the structural damage of segment joints when the short-term passive reinforcement is started, that is, on the basis of Example 1, the vertical earth pressure is continued to be increased, so that the capping block 1 and the adjacent block 2 The opening of the joint reaches 6mm. At this time, the connecting steel bolts are close to yield, and the concrete compressive strain on the outer arc surface is larger. Then, the vertical earth pressure and lateral earth pressure remain unchanged, and the segment joint is reinforced. In addition, the steps of the shield segments, connecting steel bolts, shape memory alloy bolts, and reinforcement methods are all the same.

[0039] After being strengthened by the strengthening method of shape memory alloy bolts in this embodiment, the joint opening of the shield segment joints is reduced by 37%, the maximum compressive strain of the concrete on the outer arc surface of the se...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a short-term driving reinforcing method for a metro shield tunnel pipe piece joint. The reinforcing method comprises the steps: (1) a shape memory alloy bolt installation hole is reserved in the joint portion of a top sealing block and an adjacent connecting block of a lining ring of a shield tunnel, and the size of a hand-hole in the top sealing block should facilitate assembling and disassembling of a shape memory alloy bolt; (2) when the stretching degree of the joint of the top sealing block and the adjacent connecting block is excessively large, or compression strain of concrete of the outer arc face of the top sealing block and the adjacent connecting block is excessively large, or tension strain of the connecting steel bolt of the top sealing block and the adjacent connecting block is excessively large, the pre-stretched shape memory alloy bolt is installed into the shape memory alloy bolt installation hole reserved in the joint portion of the top sealing block and the adjacent connecting block; (3) the shape memory alloy bolt is heated, and the temperature of the shape memory alloy bolt is larger than the austenite phase-change finishing temperature and basically maintains constant. The short-term driving reinforcing method has the advantages that the reinforcing effect is good, the operation is easy and fast, the economy is good, the reinforcing parts can be reduced, and normal operation of a metro during the reinforcing period is not influenced.

Description

technical field [0001] The invention relates to the technical field of intelligent control of civil engineering structures, in particular to a short-term active reinforcement method for segment joints of subway shield tunnels using shape memory alloy bolts. Background technique [0002] Shape memory alloy is a functional material with both sensing and driving functions. It has been widely used in instrumentation, automatic control, aerospace, medical appliances, automotive engineering, civil engineering, robotics and other fields. [0003] The application of shape memory alloys in civil engineering structures includes two aspects: passive control and active control. In civil engineering structures, the deformation of the structure under the action of the environment will induce the deformation of the shape memory alloy, or the pretreated shape memory alloy will be fixed in the structure after the structure is deformed. At this time, it is only necessary to heat the shape mem...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/04
Inventor 吴波欧云龙
Owner SOUTH CHINA UNIV OF TECH