Arrangement method of spontaneous combustion monitoring pipelines in goaf of filling type gob-side entry retaining fully mechanized caving face

Abstract

The invention discloses a filling type gob-side entry retaining fully mechanized caving face goaf spontaneous combustion monitoring pipeline arrangement method which comprises the steps that the number of measuring points, arrangement intervals and the distance between the measuring points and a filling wall are determined according to the coal face field condition and the entry retaining filling wall construction technology; a circumferential hole is pre-machined in the filling bag, a supporting pipe is placed in the hole in front of the filling material, and after the wall body is filled, a plugging material is sprayed to the joint of the supporting pipe and the peripheral wall body; a monitoring sensor and a line penetrate through a high-pressure rubber pipe, and two ends of the high-pressure rubber pipe are respectively connected with a protection pipe head and a supporting pipe; an iron wire penetrates through the waste rock blocking support and a rear coal rock hole, one end of the iron wire is connected with a high-pressure rubber pipe, the other end of the iron wire is connected with traction equipment, and the high-pressure rubber pipe is pulled into different depths of a goaf, namely the distance between a measuring point and a filling wall and placed on the side outer edge of the goaf of a rear scraper. The problems that a filling wall is not sealed tightly and the arrangement depth of a measuring point is difficult to control due to the fact that goaf spontaneous ignition parameters are monitored through filling type entry retaining intubation can be solved.

Description

Technical Field

[0001] The invention relates to the field of coal mine fire monitoring and prevention, and in particular to a method for arranging spontaneous combustion monitoring pipelines in goaf areas of a fully mechanized caving working face with a filling-type goaf-side lane retention. Background Art

[0002] In order to solve the problems of gas accumulation in the upper corner area of ​​the fully mechanized mining face of the traditional U-type ventilation system, improve the utilization efficiency of the tunnel, and alleviate the problem of unbalanced mining, the method of leaving the tunnel along the goaf was proposed. By establishing a Y-type ventilation system on the working face, not only the problem of gas accumulation in the upper corner area is solved, but also the gas influx in the mining face is reduced. In addition, by controlling the air volume of the two air inlet tunnels, the pressure difference between the inlet and outlet ports is reduced, and the ventilation effect and production conditions of the fully mechanized mining face are improved. However, compared with the U-type ventilation, the Y-type ventilation working face has a larger air volume, more air leakage channels on the side of the left tunnel, and the hazard of spontaneous combustion of the residual coal increases; when the gas is extracted and treated in the goaf, ventilation causes an increase in air leakage, and the scope of the oxidation zone in the mining area is expanded, and the hazard of spontaneous combustion of the residual coal needs to be reduced. The service and maintenance cycle of the tunnel along the goaf is long, the air leakage area on the side of the left tunnel is positively correlated with the strike distance of the working face, and the spontaneous combustion hazard area exists on the side of the left tunnel for a long time, which makes monitoring and treatment difficult.

[0003] According to whether the gob-side ...

[0004] The distribution range of the spontaneous combustion hazard area in the goaf side of the filling-type goaf-retaining working face is larger than that of the traditional U-shaped working face, and the direction and inclination extension range must be ascertained. The traditional buried pipe method requires a longer pipeline length, which is more dangerous due to the roof pressure or water inflow during the working face recovery. The filling wall insertion method can effectively reduce the monitoring pipeline length and make the measurement point arrangement more convenient. However, improper insertion of pipes along the filling-type goaf-retaining working face can easily cause wall leakage, and it is difficult for the measurement point to enter the goaf, making it difficult to monitor the actual gas distribution range and temperature field change characteristics. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a method for arranging spontaneous combustion monitoring pipelines in the goaf of a fully-mechanized caving working face with a filled-in goaf-retaining lane, which can solve the problems of poor sealing of the filling walls and difficulty in controlling the depth of the measuring points caused by monitoring the spontaneous combustion parameters of the goaf with a filled-in goaf-retaining lane-retaining pipe.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a method for arranging spontaneous combustion monitoring pipelines in the goaf of a fully-mechanized caving working face with a filling-type goaf-side retaining lane, which is used to accurately measure the gas composition of the goaf and determine the "three zones" of spontaneous combustion in the goaf on one side of the retaining lane, and comprises the following steps: Step 1: Determine the location of the measuring points: According to the on-site conditions of the coal mining face and the construction process of the tunnel filling wall, determine the number of measuring points, the arrangement interval and the distance between the measuring points and the filling wall; Step 2, filling the reserved holes in the wall: pre-process circular holes in the filling wall, place support pipes in the holes before filling the materials, and spray the sealing materials at the joints between the support pipes and the surrounding walls after the wall is filled; Step 3: Connect the monitoring pipeline to the filling wall: Pass the monitoring sensor and the line through the high-pressure hose, and connect the two ends of the high-pressure hose to the protection pipe head and the support pipe respectively; Step 4. Pipeline layout in the goaf: Pass the iron wire through the gangue retaining support and the pores of the coal rock at the rear. Connect one end of the iron wire to the high-pressure hose and the other end to the traction equipment. Pull the high-pressure hose into the goaf at different depths, i.e. the distance between the measuring point and the filling wall, and place it on the outer edge of the goaf side of the rear scraper.

[0007] Preferably, in step 1, the number of measuring points is 2-5; the measuring points are arranged at intervals of 10-20 m, which are integer multiples of the width of the wall filling bag; the maximum distance between the measuring points and the filling wall is 15-20 m, and they are arranged equidistantly according to the number of measuring points.

[0008] Preferably, in step 2, the pre-processed circular hole in the filling bag is located in the middle of the filling wall, 30-40 cm from the bottom, the hole runs through the wall, the hole wall connects the filling bag with the wall surface, keeps the inside of the wall sealed, and the hole diameter is the same as the outer diameter of the support tube, within the range of 56-114 mm.

[0009] Preferably, the support pipe is a seamless steel pipe with an outer diameter of 56-114 mm, and its length is the same as the thickness of the filling wall.

[0010] Preferably, the high-pressure hose in step 3 is a steel wire braided reinforced hydraulic rubber hose that complies with GB / T 3683, with an inner diameter of not less than 38 mm and bayonet connections at both ends; the protective pipe head is a sieve-shaped flower tube with a length of 300 mm and a diameter of 25-40 mm; the monitoring sensor and line are gas production pressure-resistant PE pipes, temperature sensors AD590 and cables.

[0011] Preferably, the sieve hole flower tube has air holes with a diameter of 2-5 mm drilled on the tube wall at an interval of 90°, with a total of 4 holes drilled in one circle, which are axially arranged at an interval of 20 mm along the entire length of the steel tube.

[0012] Preferably, in step 4, the detailed steps of placing the hose on the outer edge of the goaf side of the rear scraper machine are: if the goaf behind the scraper machine is not severely collapsed, place the high-pressure hose in the goaf behind the rear scraper machine; if the goaf behind the rear scraper machine has a high degree of collapse, place the high-pressure hose on the outer edge of the rear scraper machine, connect it to the roof anchor net with wire, wait for the bracket to move forward, and the high-pressure hose falls into the goaf to complete the measurement point arrangement.

[0013] Preferably, the connection between the protection pipe head and the high-pressure hose is sealed with polyurethane or yellow mud.

[0014] The beneficial effects of the present invention are as follows: the present method is designed for the fully mechanized caving working face of the filled goaf-side tunnel retention, and the test line and protective casing are inserted into the goaf area from the goaf-side tunnel retention filling body through the wall insertion pipe, and the measuring points are arranged at different distances from the filling body by using the traction equipment. The equipment, components and materials used in the present method are all commonly used materials underground. The test pipeline layout method can effectively reduce the influence of the pipeline layout on the air leakage of the filling body, shorten the pipeline layout distance, and effectively monitor the distribution range and change law of the self-ignition danger zone on one side of the filling body, thereby improving the test efficiency and test accuracy of the "three zones" of spontaneous combustion in the goaf area, and providing a scientific basis for the prediction and forecast of coal spontaneous combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the arrangement of a spontaneous combustion monitoring tube provided in an embodiment of the present invention; Figure 2 A schematic diagram of the arrangement of multiple spontaneous combustion monitoring tubes provided in an embodiment of the present invention (top view); Figure 3 A lateral schematic diagram of the arrangement of the spontaneous combustion monitoring pipe on the scraper behind the bracket provided by the embodiment of the present invention; Figure 4 A schematic diagram of the structure of a spontaneous combustion monitoring tube provided in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of the adapter provided by an embodiment of the present invention; Figure 6 A schematic structural diagram of a protective pipe head provided in an embodiment of the present invention.

[0017] Description of reference numerals: 1-leakage plugging material; 2-support pipe; 3-adapter; 4-high-pressure hose; 5-protective pipe head; 6-test pipeline; 7-wall; 8-goaf; 9-sealing material; 11-rear scraper conveyor; 12-iron wire; 13-hydraulic support; 31-caliper straight-through; 32-internal thread straight-through; 33-caliper; 51-sieve hole; 52-caliper joint; 53-four-branch pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 4-6 As shown, this embodiment provides a filling-type spontaneous combustion monitoring pipe for the goaf of a fully mechanized caving working face with goaf-retaining lanes, comprising a support pipe 2, a high-pressure hose 4 and a protective pipe head 5 which are sequentially connected from left to right and have a test pipeline 6 running through the inside. The left end of the test pipeline 6 extends out of the left side of the support pipe 2, and the right end of the test pipeline 6 extends into the protective pipe head 5. The protective pipe head 5 is provided with a sieve hole flower pipe, and the sieve hole flower pipe has a plurality of sieve holes 51 along the length direction of its pipe wall. The support pipe 2 is sealed at the pipe mouth away from the end of the high-pressure hose 4 to prevent air leakage.

[0020] The support tube 2 and the high-pressure hose 4 are connected via a transfer interface 3, and the transfer interface 3 includes an internal thread through-hole 32 and a caliper through-hole 31 that are solidified together. The support tube 2 is provided with an external thread that is compatible with the internal thread through-hole 32; one end of the high-pressure hose 4 is fixed to the caliper through-hole 31 of the transfer interface 3 via a caliper 33.

[0021] The protective pipe head 5 includes a fixed four-branch pipe 53 and a caliper joint 52. The four-branch pipe 53 is a sieve-shaped flower pipe with a length of 300 mm and a diameter of 25-40 mm. The high-pressure rubber hose 4 is fixed to the caliper joint 52 by a caliper.

[0022] The sieve holes 51 are pores with a diameter of 2-5 mm. The pores are arranged in four groups along the length of the four-branch pipe 53, with four pores in each group. Each group is arranged axially along the entire length of the four-branch pipe at an interval of 20 mm. The support tube is a seamless steel tube with an outer diameter of 56-114 mm.

[0023] The sealing plugging material 1 is used for sealing the connection between the protection pipe head 5 and the high-pressure rubber hose 4; generally, mining flexible plugging materials or other mine-approved surface spraying materials are given priority; polyurethane or yellow mud is selected in this embodiment.

[0024] The high-pressure hose 4 is a steel wire braided reinforced hydraulic rubber hose that complies with GB / T 3683, with an inner diameter of not less than 38 mm; The test pipeline 6 cable includes a cable and a monitoring sensor. The cable is wrapped with a pressure-resistant PE tube, and the monitoring sensor is a temperature sensor AD590.

[0025] like Figure 1-Figure 3 As shown, this embodiment provides a method for arranging spontaneous combustion monitoring pipelines in the goaf of a fully-mechanized caving working face with filling-type goaf-retaining lanes, which is used to accurately measure the gas composition of the goaf 8 and determine the "three zones" of spontaneous combustion in the goaf on the side of the lane retention; the specific steps are: Before filling the wall 7, the support tube 2 is arranged in the reserved hole of the filling bag. After the wall 7 is filled with the support material and solidified, the sealing material 9 is sprayed on the joint between the support tube 2 and the hole wall to prevent air leakage at the contact position between the wall 7 and the support tube 2.

[0026] During the mining of the working face, when the hydraulic support 13 moves to the front of the reserved support pipe 2, the support pipe 2 is connected to the inner thread straight 32 of the adapter 3 at one side of the goaf, and the other end of the adapter 3 is connected to the high-pressure hose 4 through the caliper straight 31, and the front of the high-pressure hose 4 is connected to the caliper joint 52 of the protection pipe head 5 through the caliper 33. The protection pipe head 5 is made of a four-branch pipe 53.

[0027] The protective pipe head 5 is provided with a plurality of sieve holes 51; The front end of the test pipeline 6 is bound with iron wire, and the support pipe 2 is placed from the side of the reserved tunnel and passed through the wall 7. The test pipeline is passed through the high-pressure hose 4 to the protective pipe head 5 using the iron wire.

[0028] An appropriate amount of a polymer plugging material 1 such as polyurethane is sprayed on the bottom of the protective pipe head 5 and the opening of the support pipe 2 .

[0029] The protective pipe head 5 is connected to a traction device such as a lever hoist by an iron wire 12, and the high-pressure rubber hose 4 is straightened into the goaf through the rear scraper conveyor 11.

[0030] The high-pressure hose 4 is arranged on the outer edge of the rear scraper conveyor 11 and fixed to the roof support anchor net with wire. When the hydraulic support 13 and the rear scraper conveyor 11 move forward, the high-pressure hose 4 falls directly into the goaf, completing the arrangement of a single measuring point.

[0031] According to the daily advancement speed of the working face and the daily construction quantity of the filling wall, the number of measuring points, the arrangement interval and the distance of the buried goaf are determined, and the remaining measuring points are arranged in sequence according to the single measuring point arrangement method.

[0032] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for arranging spontaneous combustion monitoring pipelines in goaf areas of a fully mechanized caving working face with a filling-type goaf-side entry retention, characterized in that: The following steps are involved: Step 1: Determine the location of the measuring points: According to the on-site conditions of the coal mining face and the construction process of the tunnel filling wall, determine the number of measuring points, the arrangement interval and the distance between the measuring points and the filling wall; Step 2, filling the reserved holes in the wall: pre-process circular holes in the filling wall, place support pipes in the holes before filling the materials, and spray the sealing materials at the joints between the support pipes and the surrounding walls after the wall is filled; Step 3: Connect the monitoring pipeline to the filling wall: Pass the monitoring sensor and the line through the high-pressure hose, and connect the two ends of the high-pressure hose to the protection pipe head and the support pipe respectively; Step 4. Pipeline layout in the goaf: Pass the iron wire through the gangue retaining support and the pores of the coal rock at the rear. Connect one end of the iron wire to the high-pressure hose and the other end to the traction equipment. Pull the high-pressure hose into the goaf at different depths, i.e. the distance between the measuring point and the filling wall, and place it on the outer edge of the goaf side of the rear scraper.

2. The method for arranging spontaneous combustion monitoring pipelines in goaf area of ​​fully mechanized caving working face with filling-type goaf-side entry retention as claimed in claim 1 is characterized in that: In step 1, the number of measuring points is 2-5; the interval between the measuring points is 10-20m, which is an integer multiple of the width of the wall filling bag; the maximum distance between the measuring points and the filling wall is 15-20m, and they are arranged arithmetically according to the number of measuring points.

3. The method for arranging spontaneous combustion monitoring pipelines in goaf area of ​​fully mechanized caving working face with filling-type goaf-side entry retention as claimed in claim 2 is characterized in that: In step 2, the filling bag pre-processes a circular hole in the middle of the filling wall, 30-40 cm from the bottom, the hole passes through the wall, the hole wall is connected to the filling bag and the wall surface, keeping the inside of the wall sealed, and the hole diameter is the same as the outer diameter of the support tube, within the range of 56-114 mm.

4. The method for arranging spontaneous combustion monitoring pipelines in goaf area of ​​fully mechanized caving working face with filling-type goaf-side entry retention as claimed in claim 3 is characterized in that: The support pipe is a seamless steel pipe with an outer diameter of 56-114 mm, and its length is the same as the thickness of the filling wall.

5. The method for arranging spontaneous combustion monitoring pipelines in goaf area of ​​fully mechanized caving working face with filling-type goaf-side entry retention as claimed in claim 4 is characterized in that: The high-pressure hose described in step 3 is a steel wire braided reinforced hydraulic rubber hose that complies with GB / T 3683, with an inner diameter of not less than 38mm and bayonet connections at both ends; the protective pipe head is a sieve-shaped flower pipe with a length of 300mm and a diameter of 25-40mm; the monitoring sensor and line are gas production pressure-resistant PE pipes, temperature sensors AD590 and cables.

6. The method for arranging spontaneous combustion monitoring pipelines in goaf area of ​​fully mechanized caving working face with filling-type goaf-side entry retention as claimed in claim 5 is characterized in that: The sieve hole flower tube has air holes with a diameter of 2-5 mm drilled at intervals of 90 degrees on the tube wall, with a total of 4 holes drilled around the tube, which are axially arranged at intervals of 20 mm along the entire length of the steel tube.

7. The method for arranging spontaneous combustion monitoring pipelines in goaf area of ​​fully mechanized caving working face with filling-type goaf-side entry retention as claimed in claim 6 is characterized in that: In step 4, the detailed steps for placing the hose on the outer edge of the goaf behind the scraper are as follows: if the goaf behind the scraper is not severely collapsed, place the hose in the goaf behind the scraper; if the goaf behind the scraper has a high degree of collapse, place the hose on the outer edge of the rear scraper, connect it to the roof anchor net with wire, wait for the bracket to move forward, and the hose will fall into the goaf to complete the measurement point arrangement.

8. The method for arranging spontaneous combustion monitoring pipelines in goaf area of ​​fully mechanized caving working face with filling-type goaf-side entry retention as claimed in claim 1 is characterized in that: The side pipe opening of the supporting pipe is sealed to prevent air leakage, and the connection between the protective pipe head and the high-pressure hose is provided with polyurethane or yellow mud sealing.

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