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Underpass superhighway tunnel trunk excavation static blasting construction method

A technology of static blasting and expressway, which is applied in the field of tunnel blasting and excavation, can solve problems such as unreasonable construction process, damage to tunnel initial support, and difficulty in controlling adverse effects of strata, so as to achieve safe production, reduce damage, and expand The effect of development prospects

Inactive Publication Date: 2016-08-24
CHINA RAILWAY 16TH BUREAU GRP 5TH ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The construction process is not reasonable enough, resulting in damage to the initial support of the tunnel, and the adverse impact of blasting vibration on the stratum is difficult to control

Method used

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  • Underpass superhighway tunnel trunk excavation static blasting construction method
  • Underpass superhighway tunnel trunk excavation static blasting construction method
  • Underpass superhighway tunnel trunk excavation static blasting construction method

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Embodiment Construction

[0067] The present invention is described in detail below with reference to accompanying drawing and embodiment:

[0068] attached Figure 1-5 It can be seen that a static blasting construction method for tunnel body excavation passing through the expressway follows the principles of "short footage, weak blasting, less disturbance, early spraying and anchoring, frequent measurement, and tight sealing" in the excavation and support construction of the tunnel body. According to the principle, all the surrounding rocks of this tunnel are excavated by double-side-wall pilot pit method. The footage of each section of the Tangjin expressway tunnel is controlled within the range of 0.8-1.0m.

[0069] Excavation of Level Ⅴ Surrounding Rock of Tunnel

[0070] ① For the excavation sequence of V-level surrounding rock, see figure 1 .

[0071] ② The sequence of excavation and support is described as follows:

[0072] The excavation and support of the tunnel body include the following s...

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Abstract

The invention relates to a tunnel blasting excavation method, in particular to an underpass superhighway tunnel trunk excavation static blasting construction method. Trunk excavation and support include the following steps of pilot tunnel ahead ductile grouting pre-supporting, left or right pilot tunnel upper half section excavation, left or right pilot tunnel upper half section preliminary supporting, left or right pilot tunnel lower half section excavation, left or right pilot tunnel lower half section preliminary supporting, main tunnel ahead ductile grouting pre-supporting, main tunnel upper annular excavation, main tunnel arch pre-supporting, main tunnel middle core soil excavation, main tunnel inverted arch partial excavation, main tunnel inverted arch pre-supporting, main tunnel inverted arch pouring, and using a static blasting method for construction. By means of the underpass superhighway tunnel trunk excavation static blasting construction method, damage to tunnel preliminary supporting and the adverse effect on stratum by blasting vibration are reduced, existing structures are protected, and safety production is achieved.

Description

technical field [0001] The invention relates to a tunnel blasting excavation method, in particular to a static blasting construction method for tunnel body excavation passing through an expressway. Background technique [0002] Today's explosive blasting technology is very mature. It can control the energy generated by explosives just right, so that its skills can achieve the intended blasting purpose, and it can also control the flying stones, shock waves and sounds generated when explosives explode within an ideal range. The most important blasting demolition method at present. However, in some places that are very close to surrounding buildings and cannot generate large vibrations, there is a greater risk in blasting with explosives. Therefore, a safer and more reliable demolition method is needed in these special environments. [0003] The principle of the static blasting process is: after the artificial hole is made, the rock is swelled and cracked under the action of...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 周建敏尚宝江许小兰苑庆坤许允雨熊伟朱红葛战立军史涛鹏田世川
Owner CHINA RAILWAY 16TH BUREAU GRP 5TH ENG
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