Method for treating tunnel collapse through dugand covered method

A tunnel and cavity collapse technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of many uncontrollable factors and high safety risks, and achieve the effects of ensuring safety, short construction period and low cost

Active Publication Date: 2015-11-11
CHINA RAILWAY 19TH BUREAU GRP SECOND ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that after the first collapse, several collapses (blocks) of different sizes will oc

Method used

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Experimental program
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Embodiment Construction

[0009] Reinforce the non-collapsed section; use slag mining to block the face of the tunnel to the top of the vault, so that the later collapsed rock slag in the collapse cavity is scattered on the part above the vault, and backfill holes and backfill holes are reserved when sealing the tunnel face. The grout hole and the grout return hole are made of φ48mm steel pipes, the length of which is cut according to the needs of the site. One end of the pipe head extends into the collapse cavity to a certain height, and the other end of the pipe head is exposed outside the backfill body; after the collapse section is closed, C25 is used to pump concrete to the parts above the vault Backfilling, the backfilling thickness is 2.5m, to form a concrete protective layer above the vault; in addition, to ensure the overall stability of the pumped concrete, after the tunnel face is backfilled and closed, a 6m injection ring is added from the arch line on both sides of the tunnel to the arch wai...

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Abstract

The invention discloses a method for treating tunnel collapse through a dugand covered method, which relates to the filed of constructional engineering, and substantially aims to solve the problem that existing tunnel collapse is high in construction cost and large in safety risk, wherein segments which are not collapsed are reinforced, tunnel faces are blocked off by utilizing hole slag recovery until to a position of an arch crown, enable stone ballasts which collapse in collapsed cavities in the later stage to fall into positions above the arch crown, backfill holes and overfall holes are obligated when the funnel faces are blocked off, the overfall holes use Phi (Phi) 48mm steel pipes, a pipe head arranged on one end of the steel pipes stretches into the collapsed cavities for certain height, a pipe head arranged on one end of the steel pipes is exposed outside backfill bodies, the positions above the arch crown are filled back by adopting C25 pumped concrete after collapsed segments are sealed, the backfill thickness is 2.5m, and concrete protective layers are formed on the positions above the arch crown. Furthermore, in order to guarantee the whole stability of the pumped concrete, small grouting pipes are added from springing lines of the two sides of tunnels to the positions of haunches after the tunnel faces are backfilled and sealed, and then sealed segments are divisionally excavated, supported and protected after backfilling and grouting. The method for treating tunnel collapse through the dugand covered method has the advantages that the method for treating tunnel collapse through the dugand covered method reduces safety risk and is low in construction cost.

Description

Technical field: [0001] The invention relates to the field of construction engineering, in particular to a method for treating tunnel collapse by sealing the tunnel face and pumping concrete to fill first and then dig. Background technique: [0002] Safety accidents caused by tunnel collapse treatment are one of the biggest safety hazards in the tunnel construction process. In order to ensure project safety, open cut methods are generally used to deal with tunnel collapse for construction. If the site conditions are simple, you can choose the most cost-effective slope opening However, when the site conditions are limited, it is necessary to select vertical enclosures such as underground diaphragm walls and bored piles according to the buried depth of the tunnel project, and to add the construction of the internal support structure. The construction period is also difficult to guarantee. [0003] At present, the specific plan for dealing with the tunnel collapse is as follow...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/20E21D11/10
Inventor 沈广辉解佳飞张玉曹树强徐立新步利民李秀新关华杨保旭任懿
Owner CHINA RAILWAY 19TH BUREAU GRP SECOND ENG CO LTD
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