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Bilateral expanding excavation construction method for middle pilot tunnel in tunnel

A construction method, tunnel technology, applied in the direction of tunnels, earthwork drilling, mining equipment, etc.

Active Publication Date: 2019-04-12
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The initial support section of the middle pilot tunnel can be expanded after the closure of at least 3 meters. If the side face is stable and the working height problem of manual installation of steel frames and anchor rods is overcome, it can be excavated and supported at one time, and the construction will be more efficient. Convenience; otherwise, the side hole is excavated according to the two- or three-step method

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  • Bilateral expanding excavation construction method for middle pilot tunnel in tunnel
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  • Bilateral expanding excavation construction method for middle pilot tunnel in tunnel

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Embodiment Construction

[0030] The present invention is further described below in conjunction with accompanying drawing.

[0031] Such as Figure 4 , 5 As shown, the excavation width 4 of the central pilot tunnel 1 is generally not greater than the width of an ordinary two-lane or two-lane tunnel, and is determined according to the calculation of the "load-structure" model according to the full design load borne by the initial support; the excavation width of the side tunnel should be To meet the space required for the bolting operation of the tunnel system and the space required for the slag loading and transportation machinery; the intermediate pilot tunnel is constructed by the step method, and the maximum distance between the initial support and the face of the pilot tunnel should not be greater than 1.5 times the excavation width of the pilot tunnel; The pilot tunnel shall be constructed first, and the construction of the side tunnel shall start after the initial support is closed for more tha...

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Abstract

A bilateral expanding excavation construction method for a middle pilot tunnel of a tunnel is provided. Section or excavation width of the middle pilot tunnel is generally not larger than that of a common double-line or double-lane tunnel; a step construction method is adopted, and the construction method is the same as that of a common double-line or double-lane tunnel; and the construction method is familiar to constructors, and the construction difficulty is avoided. A primary support section of the middle pilot tunnel can be expanded and excavated after being closed by at least 3 meters; if a side tunnel face is stable, and the problem of the operation height of manual installation of a steel frame and an anchor rod is solved, one-time excavation and support can be achieved, and the construction is more convenient; or otherwise, a side tunnel is excavated according to a two-step or three-step method. The primary support of the middle pilot tunnel can be timely closed; the primary support of the side tunnel and the primary support of the middle pilot tunnel can be completely connected in sequence, and various errors and deformation influences of surrounding rocks and the supportare left at an inverted arch part for treatment; and the construction progress is basically the same as that of the common double-line or double-lane tunnel.

Description

technical field [0001] The invention relates to a construction method for tunnels and underground engineering, in particular to a construction method for double-sided excavation of a pilot hole in a tunnel. Background technique [0002] For the construction method of soft rock tunnel with large cross-section, the current popular method generally adopts the double-side-wall pilot pit method, which was formed in the 1980s and adapted to the construction quality, progress, technology and construction technology level at that time , which was a safe and fast method at the time. However, with the development of the times to today, compared with the quality, progress, technology and other requirements at that time, there has been a qualitative leap. This construction method is difficult to meet the current needs, and many quality and safety hazards have been exposed, mainly in the following aspects : [0003] 1) The initial support of the double sidewall pilot pit is not closed,...

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Application Information

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IPC IPC(8): E21D9/00E21D9/01E21D9/12
CPCE21D9/00E21D9/12E21D9/01
Inventor 剧仲林董化瑞
Owner CHINA RAILWAY 12TH BUREAU GRP
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