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Construction method of cross passage from horizontal pilot tunnel to main tunnel and cross passage

A construction method and technology of horizontal passage, applied in the construction of horizontal passage and in the field of horizontal passage, can solve the problems of high roof height, construction difficulty and high risk, so as to prevent roof collapse, prevent instability and collapse, and speed up construction. effect of progress

Active Publication Date: 2019-11-12
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a construction method and the cross passage for the horizontal passage leading from the horizontal guide tunnel to the main tunnel, so as to solve the problem that the ceiling height of the cross passage entering the main tunnel is relatively high in the prior art, and the construction is difficult. risky technical issues

Method used

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  • Construction method of cross passage from horizontal pilot tunnel to main tunnel and cross passage
  • Construction method of cross passage from horizontal pilot tunnel to main tunnel and cross passage
  • Construction method of cross passage from horizontal pilot tunnel to main tunnel and cross passage

Examples

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Embodiment 1

[0050] A construction method for a horizontal passage leading from a flat pilot hole to a main hole, please refer to Figure 1 to Figure 6 .

[0051] Such as figure 1 As shown, in the construction method of the horizontal passage from the flat pilot tunnel to the main tunnel provided by the embodiment of the present invention, the section of the normal tunnel 11 is larger than the section of the flat pilot tunnel 12, and the flat pilot tunnel 12 is parallel to the normal tunnel 11, and the normal tunnel 11 is a tunnel for building roads or railways, and the flat pilot tunnel 12 is a tunnel for assisting the construction of the main tunnel 11.

[0052] In this embodiment, the sections where the positive tunnel 11 and the pilot tunnel 12 are located are located in a certain area in southwest my country, and the rock masses in the section where the positive tunnel 11 and the flat pilot tunnel 12 are located are V-level surrounding rocks, the stability of the rock masses is poor,...

Embodiment 2

[0096] A horizontal passage leading from a pilot hole to a main hole, see Figure 5 and Figure 6 .

[0097] The construction method of Embodiment 1 is adopted for the cross channel leading from the flat pilot hole to the main hole in the embodiment of the present invention. The lock opening 135 at the intersection of the transverse channel 13 and the main hole 11 is provided with an initial opening supporting steel frame around the initial opening 131, and the locking opening 135 is provided with a locking opening supporting steel frame. From the top of 131 to the top of the intersection with Zhengdong 11, the slope gradually rises along a 20% slope.

[0098] Further, the cross channel 13 also includes a ceiling 111 that transitions from the top of the lock opening 135 to the top of the main hole 11. The ceiling 111 includes a roof support steel frame, and the roof support steel frame The inclined beam 115 extending from the top of the main hole 11, and the locking support...

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Abstract

The invention discloses a construction method of a cross passage from a horizontal pilot tunnel to a main tunnel and the cross passage. The construction method of the cross passage from the horizontalpilot tunnel to the main tunnel includes the following steps that firstly, a suitable position is selected in the horizontal pilot tunnel for forming an initial tunnel opening at the intersection ofthe cross passage and the horizontal pilot tunnel; secondly, a passage body of the cross passage is excavated from the initial tunnel opening to the direction of the main tunnel, the tunnel top of thecross passage is excavated upward along a certain slope in the direction from the horizontal pilot tunnel to the main tunnel during excavation, and then opening locking construction is conducted. According to the construction method of the cross passage from the horizontal pilot tunnel to the main tunnel, the height difference between the roof brushing of the cross passage and the roof brushing of the main tunnel is reduced by raising the tunnel top of the cross passage, the difficulty of the roof brushing construction is reduced, and collapse of roof brushings is prevented; in the roof brushing construction process, excavation and supporting can be performed at any time through temporary gantries to prevent the unstable collapse caused by long exposure time of surrounding rock. In addition, the construction progress of the main tunnel can be accelerated by excavating the cross passage from an excavated section of the horizontal pilot tunnel to a non-excavation section of the main tunnel.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for a cross passage leading from a flat pilot tunnel to a main tunnel and the cross passage. Background technique [0002] Tunnel level pilot tunnels are common in some long and large tunnel projects. The horizontal pilot tunnels are auxiliary construction tunnels parallel to the main tunnel. There is usually a cross passage between the horizontal pilot tunnel and the main tunnel. During the construction of the tunnel main tunnel, in case In the event of collapse, follow-up support can be carried out through the flat pilot hole, which can also be used for drainage, ballasting, feeding and ventilation of the main tunnel. [0003] In engineering, since the cross passage is constructed inside the tunnel, the construction of the opening where the horizontal pilot tunnel enters the cross passage and the opening where the cross passage enters the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/14E21D11/14E21D11/10E21D20/00E21D11/15E21D11/18E21F16/02
CPCE21D9/14E21D11/10E21D11/14E21D11/152E21D11/18E21D20/00E21F16/02E21D9/008E21D9/01
Inventor 王亚锋曹耀祖马亮朱建民刘强吴文娟
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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