Tunnel advanced support air circulated drilling construction method and drilling tool

A technology of advanced support and construction methods, which is applied in the direction of tunnels, drilling tools, tunnel linings, etc., to achieve the effect of ensuring construction safety and construction accuracy

Inactive Publication Date: 2008-09-10
BEIJING SHOUER ENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a tunnel advance support wind circulation drilling construction method, which solves the problem of safe and rapid drilling in the construction of pipe shed support in the Quaternary New Loess area, and solves the problem of protecting the soil around the tunnel and avoiding subsidence , Prevent technical problems that cause safety hazards

Method used

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  • Tunnel advanced support air circulated drilling construction method and drilling tool
  • Tunnel advanced support air circulated drilling construction method and drilling tool

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1 Referring to Fig. 1, the construction steps of this tunnel advance support wind circulation drilling construction method are as follows:

[0033] Step 1, drilling tool installation, leveling the working surface 19 in front of the support surface 20, laying the track 1 parallel to the support surface 20 and perpendicular to the tunnel axis, erecting the frame on the track 1, and using inclined rails on the sides and up and down of the frame. The ties are tight, and the four corners of the base are reinforced with high-strength bolts on steel backing plates. The drilling rig is placed on two beams for lifting, and hand chain hoists are hung on the top of the four columns to lift the beam of the drilling rig. The beams and columns are clamped. The tiles are connected, and the frame is moved by a traveling cylinder. The drill pipe 9 used as the pipe shed steel pipe is horizontally supported on the drill carriage 8 on the frame, the front end of the drill pipe i...

Embodiment 2

[0038] Embodiment two see figure 2 As shown, the difference between the construction method of this tunnel advance support wind circulation drilling construction method and the first embodiment is that the drill bit is also connected with the guide drilling device, and the construction steps are as follows:

[0039] Step 1, drilling tool installation, leveling the working surface 19 in front of the support surface 20, laying the track 1 parallel to the support surface 20 and perpendicular to the tunnel axis, erecting a frame on the track 1, which will be used as the steel pipe for the pipe shed The drill pipe 9 is horizontally supported on the drill carriage 8 on the frame. The front end of the drill pipe is connected to the drill bit 10 with an air outlet on the head. The probe is fixed on the inner wall of the drill bit by the support, and the guide probe 16 is connected with the external display screen and the guide drilling device by the signal line. The guide probe must ...

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Abstract

The invention provides a tunnel forepoling air circulating drilling construction method. The construction steps are as follows: a driller is firstly installed and is moved to the appointed hole position along a track, according to the tunnel position line, the position angle of the driller is adjusted to ensure that the driller is parallel with the tunnel position line, the driller is fastened with a frame; an air compressor is turned on, the wind pressure is controlled above 0.4MPa, and then the driller is turned on to ensure that a drill pipe drills towards the earth at a constant speed, the compressed air is sent to an aiguille part through an internal cavity of the drill pipe and air-cools the aiguille, drilling cuttings are blown out of the drill hole from the gap between the drill pipe and the earth; the inner part of the aiguille is provided with a guide drilling device; finally, the hole drilling is finished and the grout is cast, the grout is cast into the inner cavity of the drill pipe by a casting pipe, the grout is filled into the inner cavity of the drill pipe and the ring-shaped gap out of the drill pipe, and the next hole position is turned to construct. The tunnel forepoling air circulating drilling construction method solves the problems of low security and slow drilling of the earth layer, especially the fourth new loess area pipe roofing timbering construction, can avoid the landslide and minimize the potential safety hazard.

Description

Technical field [0001] The invention relates to an advanced support method in tunnel engineering, in particular to a construction method for pipe sheds. Background technique [0002] Pipe shed is a commonly used pre-support method in the construction of underground space. Before excavation, a row of nearly horizontally arranged steel pipes is driven into the top of the space to be excavated and grouted to form a shed-like protective structure to protect the safety of excavation work. There are drilling method, pipe jacking method and pipe ramming method for pipe shed construction. According to the way of breaking rock and soil, it can be divided into percussion drilling and rotary drilling. Percussion drilling is generally used in hard formations such as various rocks and sandy pebble formations, and compressed air is used to drive down-the-hole impactors to break the formations. The rotary drilling method is to use a horizontal drilling rig to install steel pipes into th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B11/00E21B7/04E21D11/14
Inventor 杨积凯聂政熊
Owner BEIJING SHOUER ENG TECH
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