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Fine cross-over tunnel vibration-reducing blasting construction method

A construction method and sophisticated technology, applied in tunnels, tunnel lining, earthwork drilling, etc., can solve the problem of less access to the tunnel at upper and lower intersections, and achieve the effects of less safety risk, easy quality assurance, and short construction period.

Active Publication Date: 2017-09-26
CCCC FIRST HIGHWAY XIAMEN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there have been researches on the blasting vibration problems of adjacent projects such as close to existing buildings and small clear distance tunnels, but there is still relatively little research on how to adopt effective technical means to protect the operation safety of ultra-small clear distance existing tunnels in adjacent tunnels with upper and lower crossings. few

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  • Fine cross-over tunnel vibration-reducing blasting construction method
  • Fine cross-over tunnel vibration-reducing blasting construction method
  • Fine cross-over tunnel vibration-reducing blasting construction method

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Embodiment Construction

[0043] The specific location of this embodiment is the small alpine tunnel from Kunming to Changsha. The starting and ending pile numbers of this small alpine tunnel are: DK565+060~DK567+917, with a total length of 2857m. It is a single-hole and double-track structure tunnel with a designed longitudinal slope of -25‰. The Xiaoalaoshan Tunnel is located in the middle and low mountainous area of ​​the erosion structure of the Yunnan-Guizhou Plateau. The terrain in the area is generally high in the east and low in the west. The highest point in the tunnel site area is located at the top of the mountain on the south side of the tunnel axis, with an altitude of 1054.9m, and the lowest point is located at the river ditch on the side of the tunnel exit. Center, with an altitude of 677.5m and a relative height difference of 377.4m. The area through which the tunnel body passes is mainly characterized by the widespread distribution of carbonate rocks, and has the landform characteristi...

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Abstract

The invention discloses a fine high-speed railway cross-over tunnel vibration-reducing blasting construction method and relates to an underneath pass section construction scheme of an existing railway tunnel main cave. The method mainly comprising the following two implementation scheme stages: at the first stage, leg-locking reinforcement is conducted on an underneath pass section lining, then a main cave inverted arch is excavated to reach the bottom of a buffer layer, a buffer layer and reinforced concrete access boards are sequentially constructed at an underneath pass section during main cave tunnel bottom karst treatment, and finally inverted arch concreting and filling are constructed; at the second stage, a water drainage tunnel downwards penetrates through the railway tunnel main cave, and a fine vibration-reducing blasting design scheme is adopted for blasting excavation. It is ensured that a tunnel lining structure is safe and ballastless track sedimentation meets the requirements while a water drainage function is achieved and overall construction period requirements are met, and achievement of the overall construction period goal is ensured.

Description

technical field [0001] The invention relates to a fine vibration reduction blasting construction method for overlapping tunnels, in particular to the tunnel bottom treatment of the main tunnel of a high-speed railway tunnel and the secondary lining reinforcement + blasting construction technology of the drainage tunnel passing through the main tunnel. Background technique [0002] With the rapid development of the economy and the implementation of the western development strategy, the burden on railway traffic is also increasing, and the engineering conditions it faces are becoming more and more complex, and passing through the existing tunnel is one of them. As one of the main construction methods of the new Austrian method, the drill and blast method is still the main construction method of hard rock tunnel construction in my country. Drilling and blasting construction will inevitably cause vibration hazards to surrounding structures. How to ensure the smooth progress of t...

Claims

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Application Information

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IPC IPC(8): E21D21/00E21D11/10
CPCE21D11/107E21D21/00
Inventor 杜小刚周长营程玉泉任正刚白著王铁法牛海喜叶派平黄宇熊建波亢丽竹
Owner CCCC FIRST HIGHWAY XIAMEN ENG
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