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CN-122014167-A - Super-long drilling pressure relief device for tunneling working face

CN122014167ACN 122014167 ACN122014167 ACN 122014167ACN-122014167-A

Abstract

The invention relates to the technical field of gas extraction drilling and discloses an ultra-long drilling pressure relief device for a tunneling working face, which comprises a plurality of sieve tubes, wherein the sieve tubes are arranged in the drilling holes and are placed in the drilling holes for supporting, a plurality of through holes are formed in the outer wall of each sieve tube, rectangular grooves are formed in the two ends of each sieve tube, pressure relief pipes are inserted into the sieve tubes, the outer wall of each pressure relief pipe is also provided with a through hole, movable grooves are formed in the two ends of each pressure relief pipe, the movable grooves are arranged below the rectangular grooves, a buffer sleeve is used for sealing the joints of the sieve tubes, and a cavity is formed in the buffer sleeve. According to the invention, by adopting the technical means that the sieve tube is matched with the pressure relief tube, high-pressure gas, water and other mediums in the drilled holes are initially converged through the sieve tube through holes, and then guided out directionally through the pressure relief tube, the diversion path is clear, the convergence efficiency is high, the splice gap sealing is realized by the buffer sleeve at the joint of the adjacent sieve tubes, the medium leakage is avoided, the pressure relief and drainage effects are further improved, and the rock burst and gas outburst risk of the tunneling working face is effectively reduced.

Inventors

  • CHE LU
  • SUN YULONG
  • ZHAN NAN
  • LIU KAI
  • LIU JIE
  • SONG HE
  • Tao Renbin
  • LI LIANGKAI

Assignees

  • 淮北矿业股份有限公司
  • 中国矿业大学

Dates

Publication Date
20260512
Application Date
20251225

Claims (10)

  1. 1. The utility model provides a tunnelling working face overlength drilling pressure relief device which characterized in that includes The screen pipes (100) are arranged, the screen pipes (100) are placed in the drill holes to support, and rectangular grooves (102) are formed in two ends of each screen pipe (100); The pressure relief pipe (200), pressure relief pipe (200) peg graft in screen pipe (100), through-hole (101) have all been seted up to screen pipe (100) and pressure relief pipe (200) outer wall, movable groove (202) have all been seted up at pressure relief pipe (200) both ends, movable groove (202) set up in rectangular channel (102) below; the buffer sleeve (300), buffer sleeve (300) are used for sealing a plurality of screen pipes (100) junction, be provided with the cavity in buffer sleeve (300), buffer sleeve (300) outer wall encircles and is provided with a plurality of righting bag (301), righting bag (301) are linked together with buffer sleeve (300) inside, roof fixed mounting has optical fiber sensor (400) in buffer sleeve (300) for the key parameter of surrounding rock deformation, medium temperature and flow in the real-time supervision drilling.
  2. 2. The device for pressure relief of ultra-long drilling on a tunneling working surface according to claim 1, wherein the through holes (101) are spirally distributed, and the inner diameter of the through holes (101) is 8-10mm.
  3. 3. The tunneling face ultra-long drilling pressure relief device according to claim 1, wherein the screen pipe (100) is a double-layer composite pipe, and the screen pipe (100) is formed by combining an outer PE plastic layer and an inner steel layer.
  4. 4. A heading face ultra-long borehole pressure relief device as in claim 1 wherein said screen (100) is provided with an inner diameter less than 20-30mm of the borehole.
  5. 5. The pressure relief device for ultra-long drilling on a tunneling working surface according to claim 1, wherein the buffer sleeve (300) is made of a high-temperature and high-pressure resistant material, and the centralizing bag (301) is made of an elastically deformable material.
  6. 6. The pressure relief device for ultra-long drilling on a tunneling working surface according to claim 1, wherein the buffer sleeve (300) is in a cylindrical structure capable of being opened and closed, and a plurality of bolts can be arranged at the opening of the buffer sleeve (300) for connection.
  7. 7. The device for pressure relief of ultra-long drilling on a tunneling working surface according to claim 1, wherein the side wall of the buffer sleeve (300) is fixedly connected with an air inlet pipe (302) and an air outlet pipe (303), and check valves are arranged in the air inlet pipe (302) and the air outlet pipe (303).
  8. 8. The heading face ultra-long borehole pressure relief device as recited in claim 1 wherein said fiber optic sensor (400) has a radius less than the distance between the rectangular slot (102) and the inside diameter of the movable slot (202).
  9. 9. The pressure relief device for ultra-long drilling on a tunneling working surface according to claim 1, wherein a plurality of buffer rings (201) are fixedly connected to the outer wall of the pressure relief pipe (200), and the outer wall of the buffer rings (201) is abutted against the inner wall of the sieve tube (100).
  10. 10. A heading face ultra-long borehole pressure relief device as in claim 9 wherein said buffer collar (201) is provided as a water-swellable material.

Description

Super-long drilling pressure relief device for tunneling working face Technical Field The invention relates to the technical field of gas extraction drilling, in particular to an ultra-long drilling pressure relief device for a tunneling working face. Background The coal mining method is characterized in that the coal mining method is a country with rich coal resources, along with the fact that coal mines in China enter deep mining at an average growth speed of about 25m, high stress and high gas mines are increasingly increased, deformation energy accumulated by rock strata in the deep mines is larger, larger elastic energy is accumulated by roof plates in the mining process, a high stress area is easy to form, dynamic pressure phenomenon conditions exist in fault areas, the existence of high gas directly influences the physical properties and deformation properties of coal and rock mass, gas pressure acts on the coal and rock mass in a volume force mode, rock burst is promoted, and a large amount of gas is flushed out when the rock burst occurs, so that other disaster accidents are easy to cause, and in order to reduce the possibility of disaster occurrence, the mine mining safety is improved, and construction heads and gas extraction holes are needed when the rock burst and gas disaster are managed during the tunneling and the back mining of the working face. In the working process, geological data (including rock stratum inclination angle, gas content and stress distribution) are checked firstly, the integrity of a directional drilling machine, a drill rod and a measuring instrument is checked, the drilling hole position is calibrated, the drilling track is monitored in real time by adopting a measurement while drilling technology, deviation is checked once every 5m, deviation is corrected in time when the deviation exceeds the deviation, after drilling to the designed depth, rock powder in the hole is cleaned, a screen pipe is put into the screen pipe to protect the wall of the hole, a pressure relief channel is prevented from being blocked by a collapse hole, a stress sensor and a gas monitoring point are arranged immediately after the hole is completed, the monitoring is continuously carried out for 72 hours, and the fact that the pressure relief reaches the standard (the stress reduction is more than or equal to 30% and the gas concentration is stabilized below a safety value) is confirmed, and tunneling is enabled. In a soft coal seam, the rigidity of a common steel sleeve is too strong, the common steel sleeve is difficult to adapt to the deformation of the coal seam, is easy to squeeze, bend and break, but the wall of a scratch hole aggravates the collapse hole, a large number of sieve tubes are needed in an extra long drilling hole, the sealing effect of the joint of the sieve tubes is difficult to verify, the sealing effect of the joint of the sieve tubes can only be preliminarily judged through a pressure curve after grouting, whether slurry leakage and cavities exist can not be intuitively confirmed, and long-term potential safety hazards are left. Disclosure of Invention The invention provides an ultra-long drilling pressure relief device for a tunneling working face, which aims to solve the problems that the existing common steel sleeve is too high in rigidity, difficult to adapt to the deformation of a coal bed and easy to squeeze, bend and fracture in the prior art. The invention provides an ultra-long drilling pressure relief device for a tunneling working face, which comprises a plurality of sieve tubes, wherein the sieve tubes are placed in a drilling hole to carry out supporting work, and rectangular grooves are formed in two ends of the sieve tubes; The pressure release pipe is inserted into the sieve tube, through holes are formed in the sieve tube and the outer wall of the pressure release pipe, movable grooves are formed in the two ends of the pressure release pipe, and the movable grooves are arranged below the rectangular grooves; The buffer sleeve is used for sealing the joints of the sieve tubes, a cavity is formed in the buffer sleeve, a plurality of righting bags are arranged on the outer wall of the buffer sleeve in a surrounding mode, the righting bags are communicated with the inside of the buffer sleeve, and an optical fiber sensor is fixedly mounted on the inner top wall of the buffer sleeve and used for monitoring key parameters of surrounding rock deformation, medium temperature and flow in a drilling hole in real time. Preferably, the through holes are spirally distributed, and the inner diameter of the through holes is set to be 8-10mm. Preferably, the screen pipe is a double-layer composite pipe, and is formed by combining an outer PE plastic layer and an inner steel layer. Preferably, the screen is provided with an inner diameter of less than 20-30mm of the borehole. Preferably, the buffer sleeve is made of high-temperature and high-pressure resistant materials, a