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A double-shield tbm spray-anchor support structure and its construction method

A technology of shotcrete anchor support and construction method, which is applied in the directions of bolt installation, earthwork drilling, vertical shaft equipment, etc., can solve the problems of delaying the progress of the project and increasing the investment of the project, and achieves the improvement of the project progress, high flexibility and timeliness. and good sealing effect

Active Publication Date: 2019-11-22
HUANENG YARLUNG TSANGPO RIVER HYDROPOWER DEV INVESTMENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For tunnel projects whose surrounding rocks belong to Type II and Type III rock mass, due to the better self-stability of the surrounding rock, continuing to use segment lining and backfilling with pea-stones will not only delay the progress of the project but also increase unnecessary engineering investment

Method used

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  • A double-shield tbm spray-anchor support structure and its construction method
  • A double-shield tbm spray-anchor support structure and its construction method
  • A double-shield tbm spray-anchor support structure and its construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Figure 4 It is a double-shield TBM spray-bolt support structure 100: two pieces of C35 concrete segment 4 are used for surrounding rock lining at the bottom of the tunnel arch, and self-compacting concrete is filled into the cavity between the segment 4 and the surrounding rock at the bottom of the tunnel arch.

[0070] Both the first anchor rod 11 and the second anchor rod 12 are Φ22mm×L2000mm coiled anchor rods 1, and the initial spray anchor structure includes three first anchor rods 11, the first metal mesh 21 and the first concrete layer 31, and the three first anchor rods 11 Anchor rods 11 are randomly arranged within 30 degrees of the arch top of the tunnel. The first metal mesh 21 is braided by Φ8mm steel bars and hung on the end of the first anchor rod 11. The first concrete layer 31 is made of a C25 No. Formed by wet spraying of concrete, the thickness of the sprayed layer is 40mm.

[0071] The secondary shotcrete anchor structure includes the second anchor ...

Embodiment 2

[0073] Figure 5 It is another double-shield TBM spray-bolt support structure 100: two pieces of C35 concrete segment 4 are used for surrounding rock lining at the bottom of the tunnel arch, and self-compacting concrete is filled into the cavity between the segment 4 and the surrounding rock at the bottom of the tunnel arch . Both the first anchor 11 and the second anchor 12 use Φ22mm×L2500mm coiled anchor 1. The initial spray anchor structure includes five first anchors 11, the first metal mesh 21 and the first concrete layer 31, five The first anchor rods 11 are randomly arranged within 40 degrees of the vault, the first metal mesh 21 is laid on the top surrounding rock fracture zone and fixed at the end of the first anchor rods 11, and the first concrete layer 31 is made of C25 concrete 2 Formed by wet spraying, the thickness of the sprayed wet layer is 50mm.

[0074]The secondary shotcrete anchor structure includes the second anchor rods 12, the second metal mesh, the se...

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Abstract

The invention discloses a double-shield TBM shotcrete and bolting supporting structure and a construction method thereof. The double-shield TBM shotcrete and bolting supporting structure comprises segments and a shotcrete and bolting structure, and the segments are used for being lined on the surrounding rock of the arch bottom of a tunnel. The shotcrete and bolting structure comprises a metal mesh, anchor rods and a concrete layer, the metal mesh is laid on the surrounding rock of the arch crown of the tunnel, the anchor rods are anchored to the surrounding rock of the arch crown of the tunnel, the concrete layer is formed by solidification of concrete sprayed into the surrounding rock provided with the metal mesh and an anchor rod area, and the solidified concrete layer, the anchor rodsand the metal mesh form a surrounding rock supporting structure for common bearing to reinforce the surrounding rock of the arch crown of the tunnel. According to the double-shield TBM shotcrete and bolting supporting structure, the flexibility is high, the timeliness and sealing of the surrounding rock support are good, at the same time, appropriate deformation of the surrounding rock is allowedto give play to the self-bearing capacity of the surrounding rock so as to realize the flexible support of the tunnel, the shotcrete and bolting supporting structure can also make full use of the characteristic of the good self-stability of the surrounding rock, the engineering cost is reduced, and the engineering progress is accelerated.

Description

technical field [0001] The invention relates to tunnel support technology, in particular to a double-shield TBM spray-anchor support structure and a construction method. Background technique [0002] Double-shield TBM has the advantages of fast excavation speed, high safety, and strong engineering geological adaptability, and is widely used in engineering fields such as roads, railways, and hydraulic tunnels. After TBM excavation, the surrounding rock of the tunnel is usually supported by the annular lining method of the segment, the specific method is as follows: first complete the annular assembly of the segment in the TBM tail shield, then push the segment out of the tail shield, and timely insert the segment into the The cavity between it and the surrounding rock is backfilled with pea pebbles, and finally cement slurry is injected into the pores of the pea pebbles through the grouting holes of the segments to form a joint support structure of segment-gelled pea gravel-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/08E21D11/15E21D20/00E21D21/00E21D11/10E21D9/06
CPCE21D9/0607E21D11/08E21D11/105E21D11/152E21D20/00E21D21/0026
Inventor 李超毅金峰杨佐斌周虎王明友刘峰秦鹏翔王卫潘长城
Owner HUANENG YARLUNG TSANGPO RIVER HYDROPOWER DEV INVESTMENT CO LTD
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