Deformation drill bit for blasting excavation of tunnel face
A technology of props and drill bits, applied in tunnels, drill bits, drill pipes, etc., can solve the problems of excessive and under-excavation caused by surrounding displacement, uneconomical, and damage to the stability of surrounding rock, so as to improve the phenomenon of over-under-excavation and improve blasting. effect of effect
Pending Publication Date: 2021-06-25
CHONGQING JIAOTONG UNIVERSITY
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- Claims
- Application Information
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Problems solved by technology
As a result, the peripheral displacement of the tunnel face during the excavation process is prone to over- and under-excavation phenomena
Over-excavation has a great harmful effect on the stability of surrounding rock, and under-excavation will reduce the efficiency of construction operations, both of which are uneconomical
Method used
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[0015] In order to make the objects, technical solutions and advantages of the present invention, the invention will be further described in detail below with reference to the embodiments. The specific embodiments described herein are for explaining the invention and is not intended to limit the invention.
[0016] Such as Figure 1 - Figure 3 As shown, this embodiment provides a deformation drill bit for tunnel support, including a drill bar assembly 300 and a drill assembly 100 disposed at the end of the drill rod assembly 300, the drill rod assembly 300 front end end The unit has a split sleeve assembly 200;
[0017] The split sleeve assembly 200 includes a hollow sleeve 230, a slot blade 210, which is fixed to the front end of the drill rod assembly 300 located behind the drill assembly 100, and the hollow sleeve 230 The swirl blade slide 220 is opened, and the slot blade 210 is slidably fitted within the swiring blade slot 220, and the depth of the chute blade slot 220 gradual...
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The invention discloses a deformation drill bit for blasting excavation of a tunnel face. The deformation drill bit comprises a drill rod assembly and a drill bit assembly arranged at the end of the drill rod assembly, and a grooving sleeve assembly is arranged at the end part of the front end of the drill rod assembly; and the grooving sleeve assembly comprises a hollow sleeve and grooving blades, the hollow sleeve is fixedly arranged at the front end of the drill rod assembly located behind the drill bit assembly in a sleeving mode, grooving blade sliding grooves are symmetrically formed in the two side walls of the hollow sleeve, the grooving blades are assembled in the grooving blade sliding grooves in a sliding mode, and the depths of the grooving blade sliding grooves are gradually reduced from the front end to the rear end. Compared with the prior art, the grooving sleeve is additionally arranged at the joint of a drill bit and a drill rod, two side grooves can be formed in the two sides of a main hole, a drilled hole formed in the working process of the deformation drill bit is a similar round hole with a special-shaped hole with the two side grooves, the long axis direction of the special-shaped hole is the main direction of cartridge energy release, and thus, energy can be released towards a fixed direction during blasting.
Description
Technical field [0001] The present invention relates to the field of tunnel blasting excavation, particularly a deformation drill bit for tunnel support. Background technique [0002] my country has a vast, mountains and heavymasters account for about 75% of the land area. When the road passes through the mountain or heavy dunks, it is inevitable to take the way to build a tunnel. Tunnels are both basic use forms of underground spaces are also an important part of transportation networks such as railways, roads, and urban subways. However, the current tunnel is prone to various adverse conditions during the excavation construction process. [0003] The existing drilling is all kinds of "one" shaped drill bit or "plum" drill bit, and the apertures are round; facing the firing drugs and adaptation apertures, and the pharmaceutical rolls are made into a long strip for circular. . The pharmaceutical roll is detonated in the circular hole, and the energy is uniformly diffused in the c...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E21B10/00E21B17/00E21D9/00
CPCE21B10/00E21B17/00E21D9/006
Inventor 张学富周元辅向坤李宁杰陈相阁孟亮华
Owner CHONGQING JIAOTONG UNIVERSITY