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A kind of expansion method of underground tunnel from small section to large section

An underground tunnel, large-section technology, applied in tunnels, earth-moving drilling, mining equipment, etc., can solve the problems of large surface settlement, difficult construction, and high risks, so as to reduce vault settlement, reduce construction risks, and save projects. The effect of cost

Active Publication Date: 2022-07-19
CHINA RAILWAY LIUYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on the current traditional large-section underground excavation method in the construction of underground tunnels, there are problems such as high risk, high cost, long construction period, high construction difficulty, and large surface settlement when expanding a large section through a small section. Construction of a transverse system between adjacent leading pilot tunnels, and then expanding and excavating the pilot tunnels under the transverse system, from small to large sections of underground tunnels

Method used

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  • A kind of expansion method of underground tunnel from small section to large section
  • A kind of expansion method of underground tunnel from small section to large section
  • A kind of expansion method of underground tunnel from small section to large section

Examples

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Effect test

Embodiment 1

[0027] Example 1: as figure 1 As shown in the figure, a method for expanding and excavating an underground tunnel from a small section to a large section specifically includes the following construction steps:

[0028] S1, successively construct a plurality of parallel-arranged leading pilot holes required for the construction of large underground tunnels, and reserve a certain excavation spacing between adjacent leading pilot holes;

[0029] Among them, the first support of the arch part of the first pilot hole needs to be built in advance before construction, and the advance support measures should be reasonably arranged according to the characteristics of the stratum and the project;

[0030] S2, in the adjacent two leading pilot holes (such as figure 1 Between the shown first pilot hole 1 and the second pilot hole 2), at least one lateral system 5 is constructed which is connected to the primary support structure of the two pilot holes respectively. Set end anchor struct...

Embodiment 2

[0032] Example 2: as figure 2 As shown in the figure, a method for expanding and excavating an underground tunnel from a small section to a large section is different from Embodiment 1 in that, in step S3, two pilot holes (the first pilot hole 1 and the second pilot hole 2) are divided into two pilot holes. Before the excavation of the soil between them, the initial support structure 3 of the excavation part needs to be constructed to further ensure the safety of the excavation. Wherein, the initial support structure 3 of the excavation part is located below the lateral system 5 and is connected with the initial support structure of the two leading pilot holes.

Embodiment 3

[0033] Example 3: as image 3 As shown in the figure, a method for expanding and excavating an underground tunnel from a small section to a large section specifically includes the following construction steps:

[0034] S1, successively construct a plurality of parallel-arranged leading pilot holes required for the construction of large underground tunnels, and reserve a certain excavation spacing between adjacent leading pilot holes;

[0035] Among them, the first support of the arch part of the first pilot hole needs to be built in advance before construction, and the advance support measures should be reasonably arranged according to the characteristics of the stratum and the project;

[0036] S2, in two adjacent pilot holes, such as image 3 The first pilot hole 1 and the second pilot hole 2 shown are respectively constructed in the pilot hole to expand and excavate part of the initial support structure 6 and the upper backfill layer 8, and at least one construction is con...

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Abstract

The invention relates to a method for expanding and excavating an underground tunnel from a small section to a large section. Leave a certain excavation spacing; S2, construct at least one lateral system connected to the two leading pilot holes between adjacent pilot holes, and set end anchor structures at the ends on both sides of the lateral system; S3, Excavate the part that needs to be expanded between two adjacent pilot tunnels, and expand the small-section tunnel to the large-section tunnel. The method for expanding the underground tunnel from a small section to a large section by constructing a lateral system between adjacent pilot holes and then carrying out pilot hole expansion and excavation under the lateral system can effectively solve the problem of the existing small section expansion and excavation. There are problems such as high risk, high cost, long construction period, difficult construction, and large surface settlement when reaching the largest section.

Description

technical field [0001] The invention relates to the field of underground engineering, in particular to an excavation method that can effectively reduce construction risks, save engineering costs, and avoid excessive ground subsidence of an underground tunnel from a small section to a large section. Background technique [0002] With the rapid development of society, attention has been paid to the development of underground space, but most of the development locations are located below the surface roads. Due to the constraints of traffic guidance and reform, underground tunnels need to be constructed by the underground excavation method. However, when the large-section underground excavation method is used for construction under the road, there are often problems such as high risk, long construction period and high construction cost. Among them, when using the traditional hole-pillar method and the hole-pillar method, the side pile structure needs to be constructed, and the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/01E21D21/00E21D20/00
CPCE21D9/01E21D21/0026E21D20/00
Inventor 彭晨张哲强刘亮张美琴彭柳松张金伟李晓英柳晔吕杰王齐秦威风张磊
Owner CHINA RAILWAY LIUYUAN GRP CO LTD
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