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Peripheral hole arc-shaped drilling construction method for controlling tunnel overexcavation

A technology for controlling the tunnel and its surroundings. It is applied in the direction of tunnels, earthwork drilling, mining equipment, etc. It can solve problems such as delaying the construction period, affecting the safety and quality of tunnel construction, and increasing project costs, so as to enhance stability, reduce concrete backfill, Effect of reducing overbreak area

Pending Publication Date: 2021-05-14
龚伦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the drilling and blasting construction, manual hand-held pneumatic drills or construction machinery including but not limited to rock drilling rigs must be used to drill holes in the rocks and then fill them with explosives. When drilling holes around the tunnel, due to the limitations of the drilling machine structure As a result, there must be an extrapolation angle in the borehole, and there will be a certain amount of overbreak phenomenon, especially the overbreak phenomenon of mechanical drilling is particularly serious. The overbreak part must be backfilled with concrete to control the tunnel size. The concrete backfill caused by overbreak is not only It will increase the project cost, and in some weak and broken surrounding rocks, it will also affect the safety and quality of tunnel construction and delay the construction period. Therefore, how to control overexcavation more effectively is an important problem to be solved in tunnel drilling and blasting construction.

Method used

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  • Peripheral hole arc-shaped drilling construction method for controlling tunnel overexcavation
  • Peripheral hole arc-shaped drilling construction method for controlling tunnel overexcavation
  • Peripheral hole arc-shaped drilling construction method for controlling tunnel overexcavation

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Embodiment

[0026] figure 1 with figure 2 Both are schematic diagrams of the cross-sectional direction of the tunnel. The rock within the excavation contour line 21 around the face 2 needs to be removed. Refer to figure 1 In the middle drilling device A, the outer diameter of the drill pipe 1 is much smaller than the outer diameter of the drill pipe seat 11 at the rear end of the drill pipe. Due to the obstruction of the drill pipe seat 11 by the inner wall of the tunnel, when drilling peripheral holes, if the drill pipe 1 If the hole is drilled parallel to the excavation contour line 21 of the tunnel, there will be a part of rock between the drill pipe 1 and the excavation contour line 21 that cannot be removed, that is, the dotted line L in the figure 1 and the part between the excavation contour line 21, so when drilling the peripheral holes, it is necessary to follow the figure 1 The middle drilling device B is provided with a drill pipe 1, that is, the drill pipe 1 drills a hole f...

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Abstract

The invention discloses a peripheral hole arc-shaped drilling construction method for controlling tunnel overexcavation, and relates to the technical field of tunnel construction. The method comprises the following steps that S1, a drill rod is used for drilling towards the front of a tunnel in the direction forming an outer included angle 22 with the axis of the tunnel at the position close to the excavation contour line of the tunnel face, and the drilling length is L0; and S2, external force F1 facing the inner side of the tunnel and external force F2 facing the outer side of the tunnel are continuously applied to the tail end of the drill rod and the position close to a hole opening, so that the drill rod generates deformation protruding towards the inner wall of the tunnel and continuously drills holes, and the straight holes can be changed into arc-shaped holes through drilling in the state. According to the construction method, the arc-shaped tunnel drilling and blasting peripheral holes can be drilled, and compared with linear peripheral holes with the same footage length, the tunnel overexcavation amount can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an arc-shaped drilling method for peripheral holes for controlling tunnel overexcavation. Background technique [0002] As an indispensable and main tunnel rock breaking method, the drill and blast method is a method of excavating rock by drilling, charging, and blasting. In the drilling and blasting construction, manual hand-held pneumatic drills or construction machinery including but not limited to rock drilling rigs must be used to drill holes in the rocks and then fill them with explosives. When drilling holes around the tunnel, due to the limitations of the drilling machine structure As a result, there must be an extrapolation angle in the borehole, and there will be a certain amount of overbreak phenomenon, especially the overbreak phenomenon of mechanical drilling is particularly serious. The overbreak part must be backfilled with concrete to control the tunne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/10
CPCE21D9/006E21D9/10
Inventor 王立川龚伦王怡霖陈海勇赵华程永亮邢泊
Owner 龚伦
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