Tunnel digging-out supporting structure and construction method thereof

A construction method and technology for supporting structures, which are applied in tunnels, tunnel linings, and earth-moving drilling and mining, etc., can solve problems such as economic losses in tunnels, and achieve the effects of solving the difficulty of transporting construction personnel and equipment, reducing investment increases, and ensuring construction safety.

Pending Publication Date: 2019-05-03
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few researches on tunnel construction methods. With the accelerated development of my country's railway construction, more and more tunnels are facing the risk of exit construction, and many tunnels have caused huge economic losses during exit construction.

Method used

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  • Tunnel digging-out supporting structure and construction method thereof
  • Tunnel digging-out supporting structure and construction method thereof
  • Tunnel digging-out supporting structure and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as Figure 1-Figure 3 As shown, a tunnel exit support structure includes an upper step 7 and a lower step 8 provided at the tunnel entrance, and a connecting slope 12 is connected between the upper step 7 and the lower step 8, and the connecting slope 12 The slope is less than or equal to 1 / 3, ensuring that the slope is gentle enough to facilitate the transportation organization of construction personnel and construction machinery.

[0031] One side of the upper step 7 is provided with a small guide hole 9, and also includes a temporary support 6 provided in time after the excavation of the small guide hole 9, and the temporary support 6 includes a steel frame shotcrete support ; and the advanced support 1, system anchor 2, lock foot anchor 3 and initial support 4 that are used to reinforce the surrounding rock of the tunnel around the tunnel entrance, the advanced support 1 includes an advanced small conduit, and the reinforcement The surrounding rock around the ...

Embodiment 2

[0034] Such as Figure 1-Figure 3 Shown, a kind of construction method of tunnel exit support structure, comprises the following steps:

[0035] Step 1: When the tunnel construction reaches the section adjacent to the entrance, adjust the construction method to the step method. The upper step 7 and the lower step 8 are connected by a connecting slope 12. The length of the upper and lower steps should be as long as possible, and the connection between the upper and lower steps should be ensured. The slope 12 is gentle enough to facilitate the transportation organization of construction personnel and construction machinery;

[0036] Step 2: Excavate the advanced small pilot tunnel 9 on the side of the upper step 7 of the tunnel. The small pilot tunnel 9 is excavated every cycle and then the advanced support 1, the system anchor 2, the locking foot anchor 3, and the initial support are applied. 4. Support measures such as secondary lining 5 and temporary support 6 ensure the saf...

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Abstract

The invention discloses a tunnel digging-out supporting structure and a construction method thereof. The supporting structure includes upper steps and lower steps. The upper steps and the lower stepsare arranged on the entrance of a tunnel, a connecting slope is connected between the upper steps and the lower steps, small pilot tunnels are formed in the upper steps, the supporting structure further includes a temporary support, an advanced support, a system anchor rod, a foot-locking anchor rod and a preliminary support, the temporary support is arranged around the small pilot tunnels, the advanced support, the system anchor rod, the foot-locking anchor rod and the preliminary support are used for reinforcing surrounding rock around the tunnel, the supporting structure and also includes alarge pipe shed guiding wall and a large pipe shed, and after the small pilot tunnels are dug out, the small pilot tunnels are out, the large pipe shed guiding wall and the large pipe shed are constructed from outside to inside in the entrance of the tunnel; according to the construction method, benching stepping method is adopted to construct adjacent entrance sections; the advanced small pilottunnels are excavated on one side of the upper steps, the advanced support, the system anchor rod, the foot-locking anchor rod, the preliminary support and the temporary support are constructed, and the small pilot tunnels pass through to the entrance of the tunnel; the large pipe shed wall is constructed, holes are drilled in the large pipe shed wall, and the large pipe shed advanced support is provided; and the small pilot tunnels on the other side of the upper steps of the support are excavated from the holes to the entrance, the temporary support of the small pilot tunnels is dismantled, the lower steps of the support are excavated to the entrance.

Description

technical field [0001] The invention relates to the technical field of railway engineering construction, in particular to a tunnel exit support structure and a construction method thereof. Background technique [0002] With the development of my country's railway construction, more and more tunnel projects appear in mountainous railways. The terrain in the southwest mountainous area is steep, so many tunnel openings are often on high and steep slopes, and the exit is close to the bridge. However, it is difficult to build access roads to the entrance of the tunnel with high and steep slopes in mountainous areas, and it is difficult to arrange the construction site at the entrance of the tunnel, and it is difficult for construction machinery personnel to enter the entrance of the tunnel for construction. When the tunnel length is short, one-way excavation can be selected from one end with better conditions of the entrance to the other end. When the tunnel is long, it can be co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/14E21D20/00E21D11/10
Inventor 杨建民舒东利张涵王磊朱麟晨廖余陈朗
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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