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Middle separation wall top original lining cavity backfilling construction method when single-hole tunnel is changed into multiple arches

A construction method and technology for tunnels, applied in tunnel lining, tunnel, wellbore lining, etc., can solve the problem of unsuitable cavity treatment method, achieve good economic benefits and popularization and application value, not easy to leak grouting, and reduce the effect of grouting dosage.

Inactive Publication Date: 2014-07-30
CHANGAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current cavity treatment methods are not suitable

Method used

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  • Middle separation wall top original lining cavity backfilling construction method when single-hole tunnel is changed into multiple arches
  • Middle separation wall top original lining cavity backfilling construction method when single-hole tunnel is changed into multiple arches
  • Middle separation wall top original lining cavity backfilling construction method when single-hole tunnel is changed into multiple arches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A tunnel is a multi-arch tunnel reconstruction and expansion project using the existing single-hole tunnel as the intermediate pilot tunnel. The total length of the tunnel is 125m. When the right hole (first hole) was excavated to the vicinity of K0+530, it was found that the top of the original tunnel lining was empty. The cavity is large in scale, with a void height of 30cm to 2m at the top of the cave, extending horizontally to below the left arch waist, and the length of the vertical extension is unknown. Due to the large span of the tunnel, the full width of the excavation is about 34.3m, if no backfill treatment is carried out, it may cause large settlement or even landslide during construction or operation. For this reason, the backfilling of the cavity has been successfully completed by adopting the construction method of the present invention. According to the results of on-site inspection, the filling effect of the cavity is good, and no obvious settlement an...

Embodiment 2

[0051] A tunnel is a multi-arch tunnel reconstruction and expansion project using the existing single-hole tunnel as the intermediate pilot tunnel. The total length of the tunnel is 130m. When the right hole (first hole) was excavated to the vicinity of K0+560, it was found that the top of the original tunnel lining was empty. The cavity is large in scale, with a void height of 30cm to 1m at the top of the cave, extending horizontally to below the left arch waist, and the length of the vertical extension is unknown. Adopt concrete construction method of the present invention as follows:

[0052] A construction method for backfilling the original lining cavity at the top of the partition wall when a single-cavity tunnel is changed to multiple arches, which includes the following steps in sequence:

[0053] a. Construct and pour the middle partition wall 1 at the horizontal middle position of the existing tunnel;

[0054] b. After the intermediate partition wall 1 is poured, s...

Embodiment 3

[0063] A tunnel is a multi-arch tunnel reconstruction and expansion project using the existing single-hole tunnel as the intermediate pilot tunnel. The total length of the tunnel is 150m. When the right hole (first hole) was excavated to near K0+600, it was found that the top of the original tunnel lining was empty. The cavity is large in scale, with a void height at the top of the cave ranging from 20cm to 1.5m, extending horizontally to below the left arch waist, and the length of the vertical extension is unknown. Adopt concrete construction method of the present invention as follows:

[0064] A construction method for backfilling the original lining cavity at the top of the partition wall when a single-cavity tunnel is changed to multiple arches, which includes the following steps in sequence:

[0065] a. Construct and pour the middle partition wall 1 at the horizontal middle position of the existing tunnel;

[0066] b. After the intermediate partition wall 1 is poured, ...

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Abstract

The invention discloses a middle separation wall top original lining cavity backfilling construction method when a single-hole tunnel is changed into multiple arches. The method sequentially comprises the following steps that a, a middle separation wall is cast; b, an anterior hole is constructed; c, hole slag dug from the anterior hole is used for filling back a cavity arranged at one side of a posterior hole to the digging outline part of the posterior hole; d, a steel bar net is paved on the top of the backfilled hole slag, and then, concrete is sprayed on the surface of the steel bar net; e, an end template is arranged along a tunnel longitudinal frame, in addition, the end template, the surrounding rock and the original lining are fixedly built through lining by using anchor bolts; f, a side template is erected at the digging outline part of the anterior hole; g, concrete is filled and is compactly vibrated and smashed; h, the posterior hole is constructed; i, the original lining of the existing tunnel in the anterior hole and the posterior hole is dismounted. The construction method has the advantages that the original tunnel top cavity backfilling problem is effectively solved, so the pressure of the surrounding rock is uniformly transmitted onto a support protection structure, the stress uniformity and the structure completeness of the lining can be ensured, and the loading capability and the durability are improved.

Description

technical field [0001] The invention relates to tunnel construction technology, in particular to a construction method for backfilling the original lining cavity at the top of a middle partition wall when a single-hole tunnel is changed to a double-arch tunnel. Background technique [0002] With the rapid development of our country's national economy, the traffic volume is increasing day by day, and the original roads, even expressways, can no longer meet the needs of transportation. In economically developed areas, such as Shenyang-Dalian, Guangfo, Shanghai-Nanjing, Jingjintang, Beijing-Zhuhai, Shanghai-Hangzhou and other expressways, with the continuous increase of traffic volume, there are often serious traffic congestion, which affects the passage of roads Capacity and service level, so we have to consider rebuilding and expanding the original roads to ease the increasingly tense traffic pressure. In addition, in regions rich in tourism resources, such as Beijing, Hangz...

Claims

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Application Information

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IPC IPC(8): E21D11/10
Inventor 周勇狄夏永旭贾艳领叶飞
Owner CHANGAN UNIV
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