Tunnel arch wall primary support limit-intruding arch-replacing construction method based on gantry-type supporting

A technology of primary support and construction method, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., and can solve problems affecting the progress of tunnel excavation, closing doors, and existing safety issues

Active Publication Date: 2018-11-30
CHINA RAILWAY 20 BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Tunnel arch wall primary support limit-intruding arch-replacing construction method based on gantry-type supporting
  • Tunnel arch wall primary support limit-intruding arch-replacing construction method based on gantry-type supporting
  • Tunnel arch wall primary support limit-intruding arch-replacing construction method based on gantry-type supporting

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Embodiment Construction

[0062] Such as figure 1 A construction method based on gantry-type support for initial support of tunnel arch walls and encroachment limit replacement of arches is shown, including the following steps:

[0063] Step 1. Temporary inverted arch construction: construct a temporary inverted arch in the section where the arch needs to be replaced in the tunnel under construction;

[0064] 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. For details, see figure 2 ;

[0065] The arch replacement section is connected by an encroachment section and two extension sections respectively located on the front and rear sides of the encroachment section, and the encroachment section is the deformation and encroachment of the initial support structure of the tunnel in the upper cavity 1 of the tunnel. The two extension sections are tu...

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Abstract

The invention discloses a tunnel arch wall primary support limit-intruding arch-replacing construction method based on gantry-type supporting, which comprises the steps of: 1, temporary inverted archconstruction, i.e., constructing a temporary inverted arc construction in a to-be-arch-replaced section in a constructed tunnel, which needs to be subjected to arch replacement; 2, gantry-type supporting structure erection, i.e., erecting a plurality of gantry-type supporting structure for carrying out supporting on an arching which needs to be replaced on the temporary inverted arc; 3, arch replacement construction, i.e., beginning with an initial arch replacing end, removing a tunnel primary support structure in the to-be-arch-replaced section, synchronously carrying out primary support construction on the to-be-arch-replaced section in the removing process, and obtaining a tunnel primary support structure after replacement. The method disclosed by the invention is simple in step, reasonable in design, simple and convenient to construct and good in using effect, is based on the temporary inverted arc, adopts the gantry-type supporting structure, is high in structural integrity and firm in foundation, can effectively solve problems of inclination, collapse and the like of a tunnel arch-replaced steel frame, is safe and reliable in arc-replacing construction process and does not influence the tunnel construction progress.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a tunnel arch wall initial support invasion limit arch replacement construction method based on portal frame support. 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; aft...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/18
Inventor 郭朋超段武全薛琪仲维玲薛建武刘王平朱红桃王克检余雄军雷青川吕中英李校珂
Owner CHINA RAILWAY 20 BUREAU GRP
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