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Construction conversion technology of double side walls of single-hole large section tunnels

A technology with double side walls and large cross-section, which is applied in tunnels, mining equipment, earthwork drilling and mining, etc. It can solve the problems of manual operation and inconvenient construction, and achieve the effect of speeding up the construction progress, facilitating construction, and greatly adjusting flexibility

Active Publication Date: 2018-01-19
CCCC SECOND HARBOR ENG
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Problems solved by technology

Due to the large difference between the size of the section and the design of the support, it is inconvenient to construct without removing the temporary support, such as slag discharge and feeding can only be done manually

Method used

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  • Construction conversion technology of double side walls of single-hole large section tunnels

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Embodiment Construction

[0021] Such as figure 1 As shown, one of the embodiments provided by the present invention, the double-side wall construction conversion process of a single-hole large-section tunnel, comprises the following steps:

[0022] Step 1: The middle partition wall 3 on the left side of the double side wall of the large-section tunnel moves to the left to coincide with the middle partition wall of the CRD, and the temporary inverted arch of the upper and lower steps of the double side wall moves to the temporary inverted arch of the upper and lower steps of the CRD to coincide;

[0023] Step 2: Excavation and support for the upper steps of the pilot pit on the right side of the double side wall and temporary inverted arch 2 on the right side of the double side wall, excavation and support of the lower step on the right side of the double side wall, and the upper step of the pilot pit on the left side of the double side wall Excavate support and implement temporary invert 5 on the left...

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Abstract

The invention discloses a construction conversion technology of double side walls of single-hole large section tunnels. The method comprises following steps: 1. a left middle partition wall of a double-side-wall tunnel moves to the left and a temporary invert gradually moves downward to be respectively coincident with a middle partition wall and a temporary invert of CRD; 2. excavation and supportare carried out for the upper steps and the lower steps of drift heading at two sides of the two side walls and the upper step in the middle, and a middle lower step core soil is reserved; 3. small section step method of excavation and support for the upper step and the lower step is carried out; 4. excavation and support are carried out for the upper step at two sides of the middle section CRD and the lower step at the right side; 5. excavation and support are carried out for the lower step at the middle of the double side walls and for the lower step at right side of the CRD. The inventionuses the method of double-side wall drift heading and combines the moving of the partition wall and the reserved core soil for construction. The construction safety is guaranteed; the cost is reduced;the construction progress is accelerated; the construction scheme is flexible; surrounding rock deformation is rarely developed and strict deformation requirements for project construction can be met.

Description

technical field [0001] The invention relates to the technical field of highway tunnels and urban underground engineering, in particular to a double-side-wall construction conversion process for single-hole large-section tunnels. Background technique [0002] With the continuous development of my country's urban rail transit, the construction of the subway has entered a peak period. In the connecting section of the old and new tunnels and other special conditions, there will be a situation where a large-section tunnel is transformed into a double-hole tunnel. Due to the different tunnel sections, there are certain differences in lining types, support parameters and excavation methods, which determine the situation of construction method conversion during tunnel construction. Due to the large difference between the size of the section and the design of the support, it is inconvenient to construct without removing the temporary support, such as slag removal and feeding can onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00
Inventor 董汉军石磊刘毅张勇康晓平彭振肖飞贺祖浩李向阳张志强赵才郭真徐少红石福龙冯德定
Owner CCCC SECOND HARBOR ENG
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