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Temporary shoring system of tunnel arch wall initial shoring intruding limiting arch replacing construction

A technology of primary support and temporary support, applied in tunnels, tunnel linings, shaft linings, etc., can solve problems affecting the progress of tunnel excavation, arch tilting and collapse, unstable foundations, etc., and achieve high practical value and support Stabilize and solve the effect of tilting and collapsing

Pending Publication Date: 2018-11-23
CHINA RAILWAY 20 BUREAU GRP
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AI Technical Summary

Problems solved by technology

While this traditional arch replacement method affects the progress of tunnel excavation, it still has potential safety hazards and certain defects: for example, the longitudinal and horizontal directions of single-point vertical or diagonal braces are not connected, the foundation is not stable, and impact crushing is often used to demolish concrete. Hammer, it is easy to cause the arch to collapse due to uneven force on the vertical or oblique fulcrum; in severe cases, it will cause "door closing" accidents

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  • Temporary shoring system of tunnel arch wall initial shoring intruding limiting arch replacing construction
  • Temporary shoring system of tunnel arch wall initial shoring intruding limiting arch replacing construction
  • Temporary shoring system of tunnel arch wall initial shoring intruding limiting arch replacing construction

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Embodiment Construction

[0040] Such as figure 1 , figure 2 and image 3 As shown, the present invention includes a temporary inverted arch arranged in the arch section to be replaced and a plurality of gantry support structures arranged on the temporary inverted arch from front to back and supporting the arch frame 4 to be replaced. The section that needs to be replaced is the tunnel section where the initial support structure of the tunnel in the upper tunnel body 1 has been constructed and the lower tunnel body has not been excavated; the temporary inverted arch is arranged along the longitudinal extension direction of the tunnel, and the temporary inverted arch is located at The inner bottom of the upper hole body 1 of the tunnel; the arch frame 4 to be replaced is a steel arch frame supporting the arch wall of the upper hole body 1 of the tunnel in the primary support structure of the tunnel, and the arch frame 4 to be replaced is described in the section to be replaced. All the steel arches i...

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Abstract

The invention discloses a temporary shoring system of tunnel arch wall initial shoring intruding limiting arch replacing construction. The system comprises a temporary inverted arch arranged in a to-be-changed arch section and multiple portal type supporting structures which are arranged from front to back, and the temporary inverted arch is located at the inner side bottom of a tunnel upper portion hole; in the to-be-changed arch section, to-be-changed arch frames are to-be-supported arch frames except an initial replacing arch frame, each to-be-supported arch frame is supported through one portal type supporting structure, the temporary inverted arch comprises multiple temporary inverted arch supporting frames and longitudinal connecting structures, and each portal type supporting structure comprises a portal type supporting frame and a supporting assembly which is arranged on the same tunnel cross section with the portal type supporting frame. The system has the advantages of reasonable design, convenient construction and good using effect, the temporary inverted arch is taken as the basis and the portal type supporting structures are adopted, the structural comprehensiveness ishigh, the foundation is firm, the problems of tilting and collapsing of tunnel arch replacing steel frames can be effectively solved, the arch replacing construction process is safe and reliable, andthe tunnel construction process is not influenced.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a temporary support system for tunnel arch wall primary support invasion limit and arch replacement construction. Background technique [0002] With the rapid development of high-speed railways, the requirements for road transport capacity continue to increase. Double-lane large-section passenger-only tunnels, three-lane and four-lane highway large-section tunnels are not uncommon. [0003] At present, the tunnel engineering is generally still constructed by the drilling and blasting method, using the principle of the new Austrian method: that is, using the bearing capacity of the surrounding rock itself, the weak surrounding rock is excavated and then supported by a steel frame (also called a steel arch or arch). , Spray flexible initial support to limit the deformation of the surrounding rock, that is, the initial support structure of the tunnel; after t...

Claims

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Application Information

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IPC IPC(8): E21D11/18E21D11/10
CPCE21D11/105E21D11/18E21D11/183Y02E10/20
Inventor 郭朋超刘文武张广友肖小群王洪坤张忠义李校珂胡广华贾志荣田雄辉马军红王淑华
Owner CHINA RAILWAY 20 BUREAU GRP
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