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Construction method for initial supporting arch secondary-lining independent tunnel excavation and structures

A tunnel excavation and construction method technology, which is applied to tunnels, tunnel linings, shaft linings, etc., can solve the problems of low mechanization level, increased leakage probability of secondary lining structures, and slow construction speed

Active Publication Date: 2016-02-17
BCEG CIVIL ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, formwork trolleys cannot be used for the construction of the secondary lining structure. The level of mechanization is low, there are many construction joints, the probability of leakage of the secondary lining structure is increased, and the construction speed is slow. As a result, the special underground section has become the first choice for the implementation of the urban rail transit underground section project. schedule control point

Method used

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  • Construction method for initial supporting arch secondary-lining independent tunnel excavation and structures
  • Construction method for initial supporting arch secondary-lining independent tunnel excavation and structures
  • Construction method for initial supporting arch secondary-lining independent tunnel excavation and structures

Examples

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Embodiment 1

[0120] Such as Figure 1-6 As shown, the construction method for the excavation and structure of the independent tunnel with primary support double arch and second lining provided in this embodiment includes the following procedures:

[0121] (1) Drilling an advanced small conduit 1, and grouting through the advanced small conduit 1 to reinforce the formation;

[0122] (2) Excavate the earthwork; construct the initial support 2, the initial support section steel that constitutes the initial support is divided into the section steel for the cavern’s own use, and the section steel shared by two adjacent caverns. Connecting members a and b are reserved on the self-use part of the chamber; through connecting members a and b, the self-use part of the initial support of the cavern is erected on the common part of the first support of the cavern; for example Image 6 As shown, the connecting member is divided into an upper connecting member a and a lower connecting member b.

[012...

Embodiment 2

[0146] This embodiment is basically the same as Embodiment 1, the difference is:

[0147] Such as Figure 9-Figure 16 As shown, the excavation and structure construction method of the independent tunnel with primary support double-arch and second lining is used to construct the double-arch tunnel, and the specific construction procedures are constructed in sequence according to the following serial numbers:

[0148] A2 Drill the small conduit 1 ahead of the left cavern, excavate the upper soil layer of the left cavern, construct the upper half of the left cavern primary branch 2, and install the material transportation device 3;

[0149] B2 Excavate the lower soil layer of the left cavern, and construct the lower half of the left cavern primary branch 2;

[0150] C2 Drill the small conduit 1 ahead of the right cavern, excavate the upper soil layer of the right cavern, construct the upper half of the primary support 2 of the right cavern, and install the material transportation ...

Embodiment 3

[0157] This embodiment is basically the same as Embodiment 1, the difference is:

[0158] Such as Figure 17-Figure 27 As shown, the excavation and structure construction method of the independent tunnel with primary support, multiple arches and two linings is used to construct a three-arch tunnel, and the specific construction procedures are constructed in sequence according to the following serial numbers:

[0159] A3 Drill the small conduit 1 ahead of the left cavern, excavate the upper soil layer of the left cavern, construct the upper half of the left cavern initial branch 2, and install the material transportation device 3;

[0160] B3 Excavate the lower soil layer of the left cavern, and construct the lower half of the left cavern primary branch 2;

[0161] C3 Drill the small conduit 1 ahead of the middle cavern, excavate the upper soil layer of the middle cavern, construct the upper half of the first branch 2 of the middle cavern, and install the material transportati...

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Abstract

The invention relates to a construction method for concealed excavation of underground tunnels, in particular to a construction method for initial supporting arch secondary-lining independent tunnel excavation and structures. Tunnels in arch structural forms can be constructed by the aid of the method. The method can be applied to double-arch tunnels, triple-arch tunnels, four-arch tunnels and multi-arch tunnels with the arch quantities higher than four. The method includes general steps of arranging advanced small guide pipes; excavating earth by pneumatic spades in an artificially assisted manner; constructing primary linings and simultaneously reserving connecting components; timely grouting the back of shape steel according to field monitoring data; constructing material transport devices; constructing waterproof layers; erecting support formworks; constructing second linings; detaching the second linings to complete construction. The construction method has the advantages that high risks of construction of special concealed excavation intervals in urban traffic engineering can be reduced, the waterproof quality can be guaranteed, influence on ambient environments can be diminished, the construction speeds can be increased, and the engineering investment can be lowered.

Description

technical field [0001] The invention relates to a construction method for a special submerged underground section structure in an urban rail transit project, in particular to a construction method for an independent tunnel excavation and structure with multiple arches with primary support and two linings. Background technique [0002] With the rapid development of the subway, more and more projects will encounter the construction of the tunnel stop line. The tunnel stop line has the characteristics of large section, high risk, and high cost. It often adopts the form of a multi-center tunnel section, which leads to the need to adopt a large-section construction method, and the large-section construction generally adopts the double-side wall pilot pit method, the middle hole method, Construction methods such as side hole method. [0003] At present, no matter whether the CRD method, the double-side-wall pilot pit method or the middle-hole method is used for the construction o...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/14E21D11/10E21D11/38
Inventor 张宏刘军韩竹青游大江王利民卞正涛陈文章良兵王玉良石合新高洋尤田
Owner BCEG CIVIL ENG
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