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A non-span-reducing construction method for a super-large-section loess tunnel close to the underlying operating railway

A technology for loess tunnels and super-large sections, applied in tunnels, earthwork drilling, tunnel lining, etc., can solve the problems of long railway operation safety impact period, large construction process interference, and large cumulative deformation, so as to avoid surface settlement and reduce Excavation process, the effect of ensuring construction safety

Active Publication Date: 2021-10-26
CHINA TIESIJU CIVIL ENG GRP CO LTD
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Problems solved by technology

[0002] In the construction of loess tunnels close to the operating railway, the construction method mostly adopts the advanced support of the middle pipe shed in the tunnel, the construction of the double side wall pilot pit method, and the reinforcement of the existing railway with military beams. This construction method There are many excavations and procedures in sections, small construction space, large interference in construction procedures, slow work efficiency, long time span, large cumulative deformation, long impact period on railway operation safety, and high safety risks; in small construction space, at the same time When the railway track is pre-reinforced by the military beam on the existing line construction, there is also a greater safety risk to the railway operation and an increase in the work process

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  • A non-span-reducing construction method for a super-large-section loess tunnel close to the underlying operating railway
  • A non-span-reducing construction method for a super-large-section loess tunnel close to the underlying operating railway
  • A non-span-reducing construction method for a super-large-section loess tunnel close to the underlying operating railway

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[0038]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] See figure 1 , the buried depth H between the newly built super-large section loess tunnel and the operating railway is 32m, which meets the condition of proximity H=(1~2.5)D (hole width). The construction method is carried out according to the following steps:

[0040] (1) Divide the influence area of ​​the super-large-section loess tunnel under the operating railway into three support level areas-I area, II area and III area: the length L of the super...

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Abstract

The invention discloses a non-span-reducing construction method for a super-large-section loess tunnel close to an underlying operating railway. Firstly, the influence range of the super-large-section loess tunnel passing under the operating railway is divided into three support level areas-I area, II area and III area. , and then carry out the construction of the pipe shed studio, the construction of the pipe shed, the backfilling of the pipe shed work room, and the reinforcement of the small conduit in advance, and finally adopt the three-step + two-step temporary inverted arch method to excavate and support the cave body. The invention is used to safely and quickly pass under the operating railway area, shorten the construction period, reduce the cost input, achieve the combination of safety, economy and rationality, and provide the same type of super-large section loess tunnels for the construction of the same type of super-large section loess tunnels close to the under-passing operating railway. Based on the reference, the construction efficiency of super-large-section loess tunnels passing under the operating railway can be further improved, and the construction safety risk can be reduced.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a non-span-reducing construction method for a super-large-section loess tunnel that passes under an operating railway. Background technique [0002] In the construction of loess tunnels close to the operating railway, the construction method mostly adopts the advanced support of the middle pipe shed in the tunnel, the construction of the double side wall pilot pit method, and the reinforcement of the existing railway with military beams. This construction method There are many excavations and procedures in sections, small construction space, large interference in construction procedures, slow work efficiency, long time span, large cumulative deformation, long impact period on railway operation safety, and high safety risks; in small construction space, at the same time When pre-reinforcing the railway track with the military beams during the construction of the existing line, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/04E21D11/00E21D11/10E21D11/38E21D20/00
CPCE21D9/04E21D11/003E21D11/10E21D11/105E21D11/107E21D11/383E21D20/00
Inventor 姚大闯邵正辉戴文辉吴邦安张银银高扬张友海许强
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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