Execution method for feeding tiny tunnel into ultra heavy section tunnel transversally
A technology with super large section and construction method, applied in tunnels, earth-moving drilling, mining equipment, etc., can solve problems such as hidden safety hazards, slow construction, long construction period, etc., and achieve the effect of safe construction method, convenient construction and powerful measures.
Inactive Publication Date: 2009-09-30
THE FOURTH ENG CO LTD OF CTCE GRP
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Problems solved by technology
[0002] In the prior art, the main construction methods for entering a tunnel with a small section into a tunnel with a large section include the big bag method, the small bag method and the reverse pick method, etc. These methods all have problems such as different safety hazards and slow construction
Among them, the back-picking method first enters from the lower half of the large-section tunnel, and the upper part of the large-section tunnel needs to be picked up from the lower part. Large potential safety hazards; the small package method needs to be reamed separately, and the progress is slow; the large package method needs to build a construction guide tunnel, and carry out the construction of a large hole in the construction guide tunnel, which has a long construction period and high cost
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[0031] In this embodiment, the construction methods are formulated respectively according to the four parts of the small-section tunnel, the portal section, the opening section and the entrance into the large-section tunnel. The specific construction steps are as follows:
[0032] 1. Construction of small cross-section tunnels
[0033] figure 1 As shown, the upper area 1 of the small-section tunnel is excavated along the upper steps to prepare for entering the upper area of the large-section tunnel;
[0034] According to the site conditions, at the point where the small-section tunnel is 22m away from the large-section tunnel, start uphill with a slope of 10% to meet the requirements of entering the upper half of the large-section tunnel above the arch line. The small-section tunnel is excavated in two parts according to the upper and lower steps method. First, the upper part of the small-section tunnel is constructed according to the original section, and the lower part of...
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An execution method for feeding a tiny tunnel into an ultra large section tunnel transversally is characterized in that excavating a tiny tunnel top region along its upper bench, enlarging the tiny tunnel towards two sides nearby the large section tunnel to excavate a hole gate segment; excavating an opening segment of the large section tunnel top region transversally from the hole gate segment, and mounting a hoop permanent steel centering in the opening segment after completing construction; excavating a upper part double lateral walls heading of the large section tunnel transversally; thereafter excavating the lower region of the tiny tunnel along a bottom bench, and excavating the opening segment lower region of the large section tunnel locating below the opening segment transversally; excavating the lower part double lateral walls heading of the large section tunnel longitudinally in the lower region of the opening segment; and then excavating the upper part center region and the lower part center region of the large section tunnel longitudinally in sequence. The execution method of the invention is safe and high-efficient.
Description
technical field [0001] The invention relates to a construction method applied in the construction of subways, expressways, railways, etc., for entering a tunnel with a small section laterally into a tunnel with a large section. Background technique [0002] In the prior art, the main construction methods for entering a tunnel with a small section into a tunnel with a large section include the big bag method, the small bag method and the backpick method, etc. These methods all have problems such as different safety hazards and slow construction. Among them, the back-picking method first enters from the lower half of the large-section tunnel, and the upper part of the large-section tunnel needs to be picked up from the lower part. Large potential safety hazard; the small package method needs to be reamed separately, and the progress is slow; the large package method needs to build a construction guide tunnel, and carry out the construction of a large hole in the construction g...
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IPC IPC(8): E21D9/01
Inventor 潘彪杨翼熊庆华陶振华刘文斌匡建国
Owner THE FOURTH ENG CO LTD OF CTCE GRP
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