Excavation and supporting structure for weak surrounding rock super-large cross-section tunnel and construction method thereof

A technology of super large cross-section and supporting structure, applied in tunnels, tunnel linings, earthwork drilling and other directions, can solve the problems of slow construction progress, narrow working space, high construction risks, etc., achieve large construction space, simplify demolition process, guarantee safe effect

Active Publication Date: 2017-01-25
THE FIFTH ENGEERING OF CHINA RAILWAY 5TH BUREAU GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an excavation and support structure for super-large section tunnels with weak surrounding rocks and its construction method to solve the problems of too many temporary supports, difficulties in dismantling supports, high construction risks, narrow working space, and slow construction progress. high construction cost

Method used

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  • Excavation and supporting structure for weak surrounding rock super-large cross-section tunnel and construction method thereof
  • Excavation and supporting structure for weak surrounding rock super-large cross-section tunnel and construction method thereof
  • Excavation and supporting structure for weak surrounding rock super-large cross-section tunnel and construction method thereof

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Embodiment 1

[0048] Embodiment 1: as Figure 1-Figure 15 As shown, an excavation and support structure for super-large section tunnels with weak surrounding rocks includes upper support and lower support. protection, the support of the upper step 3 of the right pilot pit, the support of the lower step 4 of the right pilot pit, the support of the upper part 5 of the middle partition wall, the support of the lower part 6 of the middle partition wall, and the lower support includes the left side wall The support of the upper step 7, the support of the lower step 9 of the left side wall, the support of the step 8 of the right side wall, the support of the lower step 10 of the right side wall, the support of the upper step 11 of the central core soil, The support of the lower step 12 of the central core soil and the support of the inverted arch 13, the excavation of the lower step 2 of the left pilot pit is 5m behind the excavation of the upper step 1 of the left pilot pit, and the excavation o...

Embodiment 2

[0058] Example 2: A construction method for the excavation and support structure of a super-large-section tunnel with weak surrounding rock. The super-large-section tunnel with weak surrounding rock adopts the excavation and support of the upper step and double side wall in six parts, and the lower step adopts the step method and divides the excavation into seven parts. support. Before the excavation of the tunnel, a Φ42mm small conduit 14 is installed in the 144° range of the arch to carry out the advance support of the arch, and then the tunnel section is divided into thirteen parts according to a certain order for excavation, which specifically includes the following steps:

[0059] Step 1. Under the advanced support of the small conduit, excavate the upper step of the left pilot pit first, which is an approximate triangle shape, with a bottom width of 9.56m, a height of 4.55m, and an area of ​​27m 2 , and timely construction of the initial support arch 1, the lock foot anc...

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Abstract

The invention discloses anexcavation and supporting structure for a weak surrounding rock super-large cross-section tunnel and an operation method thereof. The weak surrounding rock super-large cross-section tunnel adopts six-step excavation and supporting for two side walls of an upper bench, and seven-step excavation and supporting based on a benching tunneling method are adopted for a lower bench. Before the excavation, an advanced small pipe is firstly adopted to perform an arch-part advanced support, and then a tunnel section is constructed in thirteen steps in a certain order. The excavation structure and method disclosed by the invention can ensure a large construction space for excavation, large-scale construction machinery can be introduced in each step, a plurality of construction sites can be constructed at the same time, so that high working efficiency is realized and construction progress is accelerated to a large extent, the number of temporary supports applied in a super-large cross-section construction process is reduced, the construction process is accelerated, temporary support removing process is simplified, safety is ensured, and efficiency is increased.

Description

technical field [0001] The present invention relates to an excavation and support structure for super-large section tunnels with soft surrounding rocks and its construction method, in particular to super-large sections of soft surrounding rocks (levels V and VI surrounding rocks) (the maximum section can reach 365m per linear meter) 2 ) tunnel excavation support construction method. Background technique [0002] In the construction process of tunnels with super large sections and weak surrounding rocks, the traditional excavation methods are the double side wall pilot pit method, CD method, CRD method, etc. For tunnels with super large sections and poor surrounding rock, the double side wall pilot pit method, CRD method It has good adaptability, but because there are many temporary supports and it is difficult to remove the supports, the construction risk is high; the construction space of each part is small, and only small machinery can be used for construction, the constru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/18E21D11/14E21D20/00E21D11/10E21D9/00
CPCE21D9/00E21D11/00E21D11/10E21D11/14E21D11/18E21D20/00
Inventor 申剑陈德斌夏真荣肖承倚吴秀雄蒋志权张健朱东平钟勇刘云周崇连解振乙王开荣徐文滕建毛陈立家颜桢伟
Owner THE FIFTH ENGEERING OF CHINA RAILWAY 5TH BUREAU GROUP
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