WO2022247044A1 - Dispositif de mesure automatique de quantité de déformation par dilatation d'une couche protégée par injection de liquide - Google Patents

Dispositif de mesure automatique de quantité de déformation par dilatation d'une couche protégée par injection de liquide Download PDF

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Publication number
WO2022247044A1
WO2022247044A1 PCT/CN2021/116177 CN2021116177W WO2022247044A1 WO 2022247044 A1 WO2022247044 A1 WO 2022247044A1 CN 2021116177 W CN2021116177 W CN 2021116177W WO 2022247044 A1 WO2022247044 A1 WO 2022247044A1
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Prior art keywords
expansion
pressure
displacement sensor
liquid injection
deformation
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PCT/CN2021/116177
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English (en)
Chinese (zh)
Inventor
仇海生
曹垚林
徐成
赵洪瑞
赵洪超
王贝
贾艳武
廖巍
张洪祯
倪兴
董全
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中煤科工集团沈阳研究院有限公司
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Priority to JP2022510847A priority Critical patent/JP7305874B1/ja
Publication of WO2022247044A1 publication Critical patent/WO2022247044A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge

Definitions

  • the invention belongs to the technical field of mining protective layers in coal mines, and in particular provides a liquid injection type automatic measuring device for expansion and deformation of a protected layer and a method for using it.
  • Protected seam mining technology refers to the regional gas control technology that reduces the gas content of coal seams adjacent to the protected high gas or outburst dangerous coal seams and eliminates their outburst risks through the pressure relief and permeability enhancement of the protected coal seams under the conditions of coal seam groups.
  • the protective layer can be further divided into an upper protective layer and a lower protective layer.
  • the characteristics of the occurrence of coal seam groups in most mining areas in my country determine that the protection layer mining is a long-term regional outburst prevention measure in my country.
  • the expansion and deformation of coal seam is an important index to measure the mining effect of protective seam.
  • Article 55 of the 2019 version of the "Detailed Rules for the Prevention and Control of Coal and Gas Outbursts" stipulates that when a mine mines a certain protective layer for the first time or the interlayer distance between the protective layer and the protected layer, lithology, and the mining thickness of the protective layer have undergone major changes, The protection effect of the protected layer and its effective protection scope should be actually inspected. According to the protection effect, the effective range is the non-prominent dangerous area. If the maximum expansion and deformation of the protected layer is greater than 3 ⁇ after actual inspection, the inspection and investigation results can be applied to other areas with the same relationship between the protective layer and the protected layer.
  • the protection effect of each protected working face must be inspected: in addition, if the interlayer distance between the protective layer and the protected layer, lithology, and the mining thickness of the protective layer are greatly When there is a change, the effect test and the scope of protection should be inspected again.
  • the deep base point method is mostly used to measure the expansion and deformation of the coal seam, that is, to drill holes through the coal seam in the rock roadway, install a pair of steel wedges on the roof and bottom of the coal seam to fix the deep base point, and lead out the steel bars and From the steel pipe to the outside of the hole, the expansion and deformation of the coal seam can be obtained by measuring the relative displacement between the steel bar and the steel pipe and converting it in combination with the drilling angle. If the drilling distance is deep, steel wire rope can be used instead of steel bar and steel pipe. The traditional measurement method is difficult in actual operation and has potential safety hazards.
  • the steel wedge is large in size, and it is easy to collide with the hole wall during the pushing process, causing misalignment, or even getting stuck in the middle of the drilling hole, resulting in installation failure; the steel wedge and steel bars are first pushed to the roof of the coal seam for fixation, and the steel wedge and steel pipe are then pushed When the bottom plate is fixed, the installation cannot be completed at one time.
  • the installation of the base point of the bottom plate will affect the stability of the base point of the top plate;
  • the steel pipe is prone to fall under the action of its own weight, which poses a safety hazard;
  • a steel wire rope is used instead of steel bars and steel pipes, it will be difficult to install and fix the steel wedge at the base point, and the steel wire rope used for measurement is lack of protection, and may be stuck in the crack of the hole wall, resulting in inaccurate measurement.
  • the deformation of the drilling hole and the impact of the drilling chips make it difficult to install the steel wedge to the designated position.
  • the Chinese invention patent with the patent number CN202010972156.1 discloses a device and method for measuring the expansion and deformation of the protected layer.
  • the present invention utilizes the drilling rig and the drill rod for construction drilling to send the steel wire rope, the first hole sealing bag, the first bag grouting pipe, etc. Enter the position above the roof of the protected coal seam in the borehole, fix it by grouting, and measure the displacement of the roof of the protected coal seam; use the casing to fix the sealing part and pass the steel wire rope, send it into the bottom of the protected coal seam in the borehole, fix it by grouting, and measure the protected coal seam.
  • the displacement of the coal seam floor; after the mining of the protective layer, the displacement of the roof and the floor of the protected coal seam are used to calculate the expansion and deformation of the protected layer after the mining of the protective layer.
  • the device needs to protect the position of the coal seam roof and bottom plate respectively through the sealing bag to fix the steel wire rope, and measure the displacement of the coal seam roof and bottom plate through the steel wire rope, so as to realize the expansion and deformation of the protected layer.
  • the fixing method is complicated, and the steel wire rope is used. Determination, the measurement error is large.
  • the Chinese invention patent with the patent number CN201610559046.6 discloses a method for measuring the expansion and deformation of the protected layer.
  • the top plate displacement measuring device includes an upper small tray, a lower small tray, a first hollow rod, a first spring, a first data transmission line, a first displacement sensor and a first digital display;
  • the upper end of the first spring is connected to the upper small tray, the lower end of the first spring is connected to the lower small tray through the first displacement sensor, the first displacement sensor is fixed on the top surface of the lower small tray, and the upper end of the first hollow rod Weld with the bottom surface of the lower small tray;
  • the bottom plate displacement measuring device includes an upper large tray, a lower large tray, a second hollow rod, a second spring, a second data transmission line, a second displacement sensor and a second digital display, the upper end of the second spring is connected to the upper large tray, The lower end of the second spring is connected to the lower large pallet through the second displacement sensor, the second displacement sensor is fixed on the top surface of the lower large pallet, and the upper end of the second hollow rod is welded on the bottom surface of the lower large pallet;
  • This measurement method requires drilling and reaming, the process is complicated, and measurement devices need to be placed on both the roof and the bottom of the coal seam.
  • the lower tray is easily affected by the falling of coal and rocks.
  • the measurement accuracy is affected by the four sets of sensors, and the cost is high.
  • the protected layer will expand and deform during the mining of the protective layer, and the amount of expansion and deformation is small, often only a few millimeters, which needs to be measured and captured in time, which requires high reliability and accuracy of the device; the protected layer expands and deforms
  • the research on the quantity measuring device is of great significance to the gas drainage and effect inspection of the protection layer mining.
  • the present invention provides a liquid injection type automatic measuring device for expansion and deformation of a protected layer and a method for using it.
  • the measuring device of the present invention considers the fixing stability of the borehole, and designs an expansion fixer. Considering that the deformation and expansion of the protected layer are small, the expansion of the protected layer during the mining process of the protected layer can be captured sensitively through the displacement sensor and the compression spring. All changes in deformation make the monitoring data timely, accurate and with higher precision.
  • a liquid injection type automatic measuring device for the expansion and deformation of the protected layer
  • the device includes a telescopic protective jacket, a compression spring, a displacement sensor, a connecting rod, an armored cable, and an expansion fixer , Straight-through check valve, reverse buckle high-pressure joint, high-pressure sealed connection drill pipe, water injection joint, digital display table;
  • One end of the displacement sensor is hinged to the internal port of the telescopic protection jacket, the displacement sensor can move axially along the telescopic protection jacket, and the other end is fixed to one end of the connecting rod.
  • a compression spring is arranged in the telescopic protection jacket, and one end of the compression spring is connected to the telescopic protection jacket.
  • the inner port of the jacket is fixed, the other end is fixed to the outer wall of the displacement sensor, the other end of the connecting rod is fixed to one end of the expansion fixer, and the other end of the expansion fixer is connected to the high-pressure seal through a straight-through check valve and a reverse buckle high-pressure joint
  • the drill pipes are connected, and the end of the high-pressure sealed connection drill pipe is connected to the water injection joint, and the water injection joint is connected to the water injection pump through a high-pressure rubber hose; the other end of the displacement sensor is connected to an external digital display meter through an armored cable.
  • the expansion fixer includes an expansion capsule, a fixer liquid injection tube and a fixer middle tube; the two ends of the expansion capsule are respectively buckled and sealed to the outside of the fixer middle tube, and the outlet end of the fixer liquid injection tube extends into the In the sealed space between the expansion capsule and the middle pipe of the holder, the inlet end of the liquid injection pipe of the holder is connected to the straight-through one-way valve, the middle pipe of the holder is provided with inclined holes, and the armored cables pass through the connection in turn The rod and the middle pipe of the fixer pass through the oblique hole and connect with the external digital display meter.
  • connecting rod is forwardly threaded with the telescopic displacement sensor.
  • the reverse buckle high-pressure joint is connected with the reverse thread of the high-pressure sealing connection drill pipe.
  • the number of connecting rods and the number of high-pressure sealed connecting drill rods are at least one, and when the number of connecting rods or high-pressure sealed connecting drill rods is two or more, there Positive threaded connection between rods.
  • the stroke of the telescopic protective jacket is smaller than the range of the displacement sensor.
  • the water injection pump is provided with a safety overflow valve, and the threshold of the safety overflow valve is smaller than the maximum withstand pressure value of the expansion capsule.
  • the displacement sensor is a telescopic displacement sensor, a laser displacement sensor, an optical fiber displacement sensor or a grating displacement sensor.
  • the displacement sensor, the armored cable, and the digital display meter are all intrinsically safe.
  • the present invention also provides a method for using a liquid injection type automatic measuring device for the expansion and deformation of the protected layer. Using the above liquid injection type automatic measurement device for the expansion and deformation of the protected layer, the steps are as follows:
  • Step 1 select a roadway with stable coal and rock formations, use a drilling rig to drill holes of predetermined size to pass through the protected layer, and stop construction after passing through the coal seam for 1m;
  • Step 2 Remove the water injection joint in the automatic measurement device for the expansion and deformation of the protected layer of the liquid injection type, and push the liquid injection type automatic measurement device for the expansion and deformation of the protected layer to the bottom of the drill hole through the high-pressure sealed connection of the drill pipe, and then insert the
  • the armored cable is connected to the digital display meter, and the reading of the displacement sensor is displayed through the digital display meter, and the measuring device is continuously pushed to compress the compression spring in the telescopic protection jacket, and the pushing compression amount is controlled by reading the displacement reading of the digital display meter in real time;
  • Step 3 After connecting the high-pressure sealed drill pipe to the water injection pump through the water injection joint and high-pressure rubber hose, turn on the water injection pump to inject water into the expansion fixer of the measuring device through the high-pressure sealed drill pipe, and the high-pressure water flows through the straight-through check valve and the fixer to inject liquid
  • the tube reaches the space between the expansion capsule and the middle part of the tube, the expansion capsule expands and deforms, and squeezes the rock wall of the borehole to fix the measuring device;
  • Step 4 stop the water injection pump, remove the water injection joint and high-pressure rubber hose, use the drilling rig to reversely rotate the high-pressure sealing connection drill pipe, realize the separation of the reverse buckle high-pressure joint and the high-pressure sealing connection drilling pipe, and withdraw the high-pressure sealing connection drilling pipe;
  • Step 5 Reset the digital display meter to zero. During the recovery process of the protective layer, monitor and record the displacement reading of the digital display meter in real time. According to the drilling angle, the expansion and deformation of the protected layer can be converted.
  • the present invention has the beneficial effects that: compared with the prior art, the present invention adopts a hydraulic method to replace the traditional steel wedge and other fixing methods, and has the characteristics of stable installation, easy installation, and strong anti-interference; at the same time
  • the displacement sensor is arranged inside the measuring device to replace the long-distance steel wire rope relative displacement orifice measurement, which realizes the direct high-precision real-time measurement of the expansion deformation, and only one set of displacement sensor system is needed.
  • the high-pressure sealed connection drill pipe can be recycled and the cost Low, simple system, high reliability.
  • Fig. 1 is the structural representation of automatic measuring device of the present invention
  • 1 telescopic protective jacket 1 compression spring, 3 displacement sensor, 4 connecting rod, 5 armored cable, 6 expansion fixer, 7 straight-through check valve, 8 buckle high-pressure joint, 9 high-pressure sealing connection drill pipe, 10 Water injection joint, 11 water injection pump, 12 high-pressure hose, 31 digital display, 61 expansion capsule, 62 fixer liquid injection tube, 63 fixer middle tube.
  • a liquid injection type automatic measuring device for the expansion and deformation of the protected layer is generally used when the pushing depth is greater than 10m.
  • Cable installation 5 expansion fixer 6, straight-through check valve 7, reverse buckle high-pressure joint 8, high-pressure sealing connection drill pipe 9, water injection joint 10, digital display meter 31;
  • One end of the displacement sensor 3 is hinged to the internal port of the telescopic protective jacket 1, and the other end is fixed to one end of the connecting rod 4.
  • the displacement sensor 3 can move axially along the telescopic protective jacket 1, and a compression spring 2 is arranged in the telescopic protective jacket 1.
  • One end of the compression spring 2 is fixed to the inner port of the telescopic protective jacket, the other end is fixed to the outer wall of the displacement sensor 3, the other end of the connecting rod 4 is fixed to one end of the expansion fixer 6, and the other end of the expansion fixer 6 passes through
  • the one-way valve 7, the reverse buckle high-pressure joint 8 are connected with the high-pressure sealed connection drill pipe 9, and the end of the high-pressure sealed connection drill pipe 9 is connected with the water injection joint 10, and the water injection joint 10 is connected with the water injection pump 11 through the high-pressure rubber hose 12;
  • the other end of the displacement sensor 3 is connected to an external digital display meter 31 through an armored cable 5 .
  • the expansion fixer 6 includes an expansion capsule 61, a fixer liquid injection pipe 62 and a fixator middle pipe 63;
  • the outlet end extends into the sealed space between the expansion capsule 61 and the middle pipe 63 of the holder, the inlet end of the liquid injection pipe 62 of the holder is connected to the straight-through check valve 7, and the middle pipe 63 of the holder is provided with
  • the inclined hole 631, the armored cable 5 passes through the connecting rod 4 and the middle pipe 63 of the fixture in turn, passes through the inclined hole 631 and is connected with the external digital display meter 31.
  • the outlet end of the liquid injection pipe 62 of the holder is a curved structure, and penetrates into the sealed space between the expansion capsule 61 and the middle pipe 63 of the holder from the through hole provided in the middle pipe 63 of the holder.
  • the connecting rod 4 and the displacement sensor 3 are positively threaded.
  • the number of the connecting rod 4 and the number of the drill pipe 9 connected with the high-pressure seal are at least one, and the connecting rod 4 is forwardly threaded with the middle pipe 63 of the holder. According to actual needs, when there are two or more connecting rods 4 or high-pressure sealed connecting drill rods 9, the connecting rods 4 or high-pressure sealed connecting drill rods 9 are forwardly threaded.
  • the reverse buckle high-pressure joint 8 is connected with the reverse thread of the high-pressure sealing drill pipe 9 .
  • the displacement sensor 3 is a telescopic displacement sensor, a laser displacement sensor, an optical fiber displacement sensor or a grating displacement sensor.
  • the axial movement stroke of the telescopic protective jacket 1 relative to the displacement sensor 3 is smaller than the range of the displacement sensor 3 .
  • the water injection pump 11 is provided with a safety overflow valve, and the threshold of the safety overflow valve is smaller than the maximum withstand pressure value of the expansion capsule 61 .
  • the displacement sensor 3, the armored cable 5, and the digital display meter 31 are all intrinsically safe.
  • the present invention also provides a method for using a liquid injection type automatic measuring device for the expansion and deformation of the protected layer, using the above liquid injection type automatic measurement device for the expansion and deformation of the protected layer according to the following steps:
  • Step 1 select a roadway with stable coal and rock formations, use a drilling rig to drill holes of predetermined size to pass through the protected layer, and stop construction after passing through the coal seam for 1m;
  • Step 2 Remove the water injection joint in the automatic measurement device for the expansion and deformation of the protected layer of the liquid injection type, and push the liquid injection type automatic measurement device for the expansion and deformation of the protected layer to the bottom of the borehole through the high-pressure sealing connection drill pipe 9 (according to Pushing depth needs, can adopt a plurality of high-pressure sealed connection drilling rods 9 to be connected, each high-pressure sealing connection drill rods 9 forward screw connection), then the armored cable 5 is connected with the digital display meter 31, through the digital display meter 31 Display the reading of the displacement sensor 3, continue to push the measuring device in a small amount, compress the compression spring 2 in the telescopic protective jacket 1, and control the pushing compression amount by reading the displacement reading of the digital display meter 31 in real time;
  • Step 3 After connecting the high-pressure sealed drill pipe 9 with the water injection pump 11 through the water injection joint 10 and the high-pressure rubber hose 12, turn on the water injection pump 11 and inject water into the expansion fixer 6 of the measuring device through the high-pressure sealed drill pipe 9, and the high-pressure water flows through the straight-through unit.
  • the fixer liquid injection pipe 62 to the space in the middle of the expansion capsule 61 and the fixer middle pipe 63, the expansion capsule 61 is expanded and deformed, and squeezes the drilling rock wall to realize the fixation of the measuring device;
  • Step 4 stop the water injection pump, remove the water injection joint 10 and the high-pressure rubber hose 12, use the drilling rig to reversely rotate the high-pressure sealing connection drill pipe 9, realize the separation of the anti-clamp high-pressure joint 8 and the high-pressure sealing connection drilling pipe 9, and withdraw the high-pressure sealing connection drill pipe pole 9;
  • Step 5 reset the digital display meter 31 to zero, and monitor and record the displacement readings of the digital display meter 31 in real time during the recovery process of the protective layer, and convert the expansion and deformation of the protected layer according to the drilling angle.
  • the protected layer expansion and deformation measurement device proposed in the present invention considering the stability of the drilling fixation, designed the expansion fixer, considering the small deformation and expansion of the protected layer, the displacement sensor and the spring assembly can sensitively capture the protection All changes in the expansion and deformation of the protected layer during the layer mining process make the monitoring data timely, accurate and with higher precision.

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  • Testing Or Calibration Of Command Recording Devices (AREA)
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Abstract

La présente invention concerne un dispositif de mesure automatique de la quantité de déformation par dilatation d'une couche protégée par injection de liquide. Le dispositif comprend un manchon de protection télescopique, un ressort de compression, un capteur de déplacement, une tige de raccordement, un câble blindé, un dispositif de dilatation, un clapet antiretour en ligne, un joint haute pression à verrouillage inversé, un joint haute pression reliant une tige de forage, un joint d'injection d'eau et un compteur à affichage numérique. La présente invention concerne également un procédé d'utilisation du dispositif de mesure automatique de la quantité de déformation par dilatation d'une couche protégée par injection de liquide. La présente invention remplace les modes de fixation classiques, tels que les biseaux en acier, par un mode hydraulique, et présente les caractéristiques suivantes : stabilité et commodité d'installation et haute performance anti-interférence ; en outre, le capteur de déplacement est disposé à l'intérieur du dispositif de mesure pour remplacer le port de mesure du déplacement relatif d'un câble métallique sur une longue distance, de manière à mettre en œuvre une mesure directe, de haute précision et en temps réel d'une quantité de déformation par dilatation, et un seul ensemble de systèmes de capteur de déplacement est nécessaire ; pendant ce temps, la tige de forage de raccordement du joint haute pression peut être recyclée, ce qui permet de réduire les coûts, d'obtenir un système simple et une haute fiabilité.
PCT/CN2021/116177 2021-05-28 2021-09-02 Dispositif de mesure automatique de quantité de déformation par dilatation d'une couche protégée par injection de liquide WO2022247044A1 (fr)

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CN117404014B (zh) * 2023-12-15 2024-02-09 中煤科工集团沈阳研究院有限公司 一种注液、固液、推管循环式定向钻护孔装置及工艺

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