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Tunnel supporting lining with buffer performance and construction method of tunnel supporting lining

A tunnel and lining technology, which is applied in the field of tunnel support lining and construction with cushioning performance, can solve problems such as easy deformation or fracture, easy softening, and large deformation of soft rock, so as to improve connection strength and stability, and improve support Strength and the effect of improving support performance

Pending Publication Date: 2019-08-13
河北丞璐建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main manifestations are as follows: 1. The problem of hard rock rockburst. With the increase of long tunnels passing through large buried depths and high ground stress conditions year by year, the rockburst of underground engineering in my country is showing a trend of frequent occurrence; 2. The problem of large deformation of soft rock. The body has the characteristics of low strength, poor properties, and easy softening when exposed to water. During the construction of underground caverns, the problem of large deformation disasters is prominent, which seriously endangers the construction and operation safety of underground caverns.
[0003] Up to now, although many related studies have been carried out on the problems of rockburst and large deformation of soft rock tunnels in the construction of railways and highways, an effective technical support system has not been formed. Under engineering construction conditions, the traditional support structure has been greatly challenged. At the same time, railway and highway tunnels in alpine regions are prone to frost heaving hazards; existing tunnel reinforcement support structures and construction methods cannot effectively adapt to tunnel rockbursts, freezing The shape change caused by expansion or large deformation of soft rock cannot effectively release the additional load caused by tunnel rockburst, frost heave or large deformation of soft rock
[0004] For the convenience of installation and manufacture, the existing tunnel support is formed by splicing in the circumferential direction. When subjected to the pressure of the tunnel rock wall, the spliced ​​position is easily deformed or broken, so that the tunnel support loses its support ability

Method used

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  • Tunnel supporting lining with buffer performance and construction method of tunnel supporting lining
  • Tunnel supporting lining with buffer performance and construction method of tunnel supporting lining
  • Tunnel supporting lining with buffer performance and construction method of tunnel supporting lining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as Figure 1 to Figure 8 As shown, a tunnel support lining with cushioning performance includes a support body located in the tunnel rock wall 1 and matching its arch shape. The support body includes an outer layer support body 2 arranged from outside to inside, a middle layer The supporting body 3 and the inner layer supporting body 4, the two ends of the middle layer supporting body 3 and the inner layer supporting body 4 are fixed with the tunnel invert; the outer layer supporting body 2 includes a flexible net 5 , the flexible net 5 is in contact with the tunnel rock wall 1, and fixed with the tunnel rock wall 1 by means of a plurality of decompression bolts 6 arranged at intervals; one end of the decompression bolt 6 is embedded in the tunnel rock wall 1, and the other end is connected to the tunnel rock wall 1 The flexible net 5 is fixed.

[0044] Such as figure 2 As shown, the flexible net 5 of the outer support body 2 is a steel wire net, and the decompr...

Embodiment 2

[0067] On the basis of Example 1, such as Figure 9As shown, the decompression anchor rod 6 is provided with a top plate 601, a decompression member 602 and a nut 603; the top plate 601 is inside the flexible net 5 and is in contact with it; the nut 603 is threadedly connected with the decompression anchor rod 6; The decompression piece 602 is located between the top plate 601 and the nut 603; the top plate 601 is used to make the flexible net 5 fit the tunnel rock wall 1, the decompression piece 602 can play a buffering role when the tunnel deforms, and the decompression piece 602 can be It can be a spring, rubber or a composite of spring and rubber.

[0068] The section steel 12 is in the shape of "I", and the end of the steel mesh 8 is fixed to the web of the section steel 12; after the spraying treatment, the steel mesh 8 and the concrete form a high-strength support, and the steel mesh 8 is located in the middle of the concrete , to play a better supporting effect.

[0...

Embodiment 3

[0074] On the basis of Embodiment 2, in step S4, in the process of splicing the corrugated board 101, install a water-permeable layer 119 and a perforated water guide pipe 118 in the outer trough of the corrugated board 101, and install the water guide pipe 118 in its A heating belt 120 is worn inside.

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Abstract

The invention discloses a tunnel supporting lining with a buffer performance and a construction method of the tunnel supporting lining. Supporting bodies, which includes an external layer supporting body, a middle layer supporting body and an internal layer supporting body, are installed in a tunnel rock wall, the shape of the supporting bodies are matched with the shapes of the external layer supporting body, the middle layer supporting body and the internal layer supporting body, and the supporting bodies are fit for tunnel initial transformation caused by frost heaving and rock burst aftertunnel excavation; when a steel frame is pressed by a pressure produced by the tunnel rock wall, a first top block slides into a first housing and compresses a first flexible part, a first pressure reducing mechanism allows the pressure to be released and buffered, so the steel frame is still provided with a supporting performance; a second pressure reducing mechanism can not only improve the connection intensity and stability of axially-adjacent shape steel, but higher pressure can be taken on by matching with the first pressure reducing mechanism; and an inner layer pressure reducing deviceis installed in the internal layer supporting body, the transformation caused by rock burst, frost heaving or great transformation of soft rock can be fit by a supporting plate, and the supporting performance of the tunnel supporting lining is ensured.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a tunnel support lining with cushioning performance and a construction method. Background technique [0002] With the massive construction of tunnels and underground projects, "deep", "long", "dangerous" and "big" have become the main characteristics of current tunnel projects, and the high ground stress environment also brings a series of problems. The main manifestations are as follows: 1. The problem of rockburst in hard rock. As the number of long tunnels passing through large buried depths and high ground stress increases year by year, rockbursts in underground engineering in my country are showing a trend of frequent occurrence; 2. The problem of large deformation in soft rock. The body has the characteristics of low strength, poor properties, and easy softening when exposed to water. During the construction of underground caverns, the problem of large deformation disasters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/18E21D11/20E21D21/00
CPCE21D11/003E21D11/18E21D11/20E21D21/0026Y02E10/20
Inventor 曹宁宁肖建辉罗伯婵田国辉李岩
Owner 河北丞璐建设工程有限公司
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