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Method for digging backward hole of tunnel with quite small clear distance

A technology of backward tunneling and clear distance, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., to achieve the effects of saving construction period, facilitating process arrangement, and saving material costs

Active Publication Date: 2014-05-21
CHINA CONSTR SIXTH ENG DIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no other effective construction method for tunnels with a thickness of middle rock less than 2 meters

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  • Method for digging backward hole of tunnel with quite small clear distance
  • Method for digging backward hole of tunnel with quite small clear distance

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Embodiment Construction

[0021] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0022] see Figure 1-2 , the train of thought of the excavation method of a kind of extremely small clear distance tunnel of the present invention is: do not need the partition wall in the construction, directly complete the construction of the leading hole 1 according to the existing construction method of the single-hole tunnel, after the construction of the leading hole is completed, Drill the longitudinal shock-absorbing hole 3 of the back hole, then carry out the offset core blasting of the back hole, and then blast the surrounding area, thereby reducing the vibration damage of the back hole blasting to the septum rock and the front hole. The grouting conduit 2 is reserved in the septum rock, and the broken cracks in the septum rock caus...

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Abstract

The invention discloses a method for digging a backward hole of a tunnel with a quite small clear distance. The method comprises following steps that firstly, a step of digging a first section of a hole is finished and includes 1) drilling longitudinal rows of shock absorption holes along the height direction of the backward hole on one side close to a middle partition rock; 2) deviating to one side far away from the middle partition rock by 1m to 2m, hollowing out and basting the backward hole and removing slag; and 3), blasting the periphery of the backward hole, removing slag, forming the first section of the hole, and exposing a first section of the middle partition rock; secondly, the first section of the middle partition rock is grouted and reinforced, and the first section of the middle partition rock and a tunnel structure are integrated; and thirdly, the first step and the second step are repeated until construction of a small-clear-distance section of the backward hole is finished. The method can save work period, simultaneously labor cost, material cost and machinery cost can be saved by about 50%, and arrangement of work procedures is reasonable so as to bring convenience for connection of the work procedures.

Description

technical field [0001] The invention relates to an excavation method for a tunnel hole, in particular to an excavation method for a tunnel with a very small clear distance behind. Background technique [0002] When the thickness of the partition rock in a conventional double-cavity tunnel is less than 2 meters, a composite partition wall and double-arch tunnel structure is adopted. The construction period of this structure is longer, and the construction cost is higher. However, there is no other effective construction method for tunnels with a thickness of the septum rock less than 2 meters at present. Contents of the invention [0003] In order to solve the technical problems existing in the known technology, the present invention provides a method for excavating the rear tunnel of a very small clear distance tunnel which can shorten the construction period and reduce the construction cost. [0004] The technical solution adopted by the present invention to solve the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/10F42D3/04
Inventor 杨毅辉杨进雷阳传王殿永
Owner CHINA CONSTR SIXTH ENG DIV CORP