Measuring device and measuring method for measuring development heights of two zones of overlying strata goaf

Abstract

The invention provides a measuring device and a measuring method for measuring the development height of two zones of an overlying strata goaf, the measuring device comprises a water supply pipe, a test pipe, a first air bag and a second air bag, the first air bag and the second air bag sleeve the water supply pipe at intervals along the extension direction of the water supply pipe, and the first air bag and the second air bag both have an expansion state and a contraction state; the air inflation structure comprises an air inflation shell, an elastic reset piece and a sealing piece, the two ends of the elastic reset piece are connected with the inner wall of the air inflation shell and the sealing piece respectively, and the sealing piece is matched with the inner periphery of the air inflation shell; when the sealing piece is located at the initial position, the first air bag and the second air bag are both in a contracted state. When water in the water supply pipe enters the pressurizing cavity through the water inlet to push the sealing piece to move from the initial position to the pressurizing position, the first air bag and the second air bag are both in an expansion state. By means of the technical scheme, the technical problem that in the prior art, water is independently supplied to an air bag, so that water charging and discharging time is long can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of measuring the height of two zones in a goaf area, and in particular to a measuring device and a measuring method for measuring the height of two zones in a goaf area of ​​overburden rock. Background Art

[0002] As my country's coal resources move deeper, more complex geological conditions have brought new challenges to coal mining technology. Faced with such a situation, the state and society have put forward higher requirements for coal mine safety production. Since the hydrogeological conditions of each mining area are not exactly the same, simple theoretical calculations cannot fully meet the needs of coal mine safety production. Therefore, reliable on-site measurements are also extremely necessary for on-site production. The traditional methods used for observing the height of two-zone development mainly include borehole peek method, geophysical prospecting method and double-end water plug measurement. Among them, double-end water plug measurement is the most accurate method, but it is also the most cumbersome measurement operation. Optimizing the double-end water plug measurement equipment and methods without changing its accuracy can effectively improve the efficiency of testers and reduce the time required for testing, which has practical significance for on-site production.

[0003] Most of the existing double-end water plugging technologies use the method of independent water supply by air bags. Since the diameter of the air bag pressure supply pipe is small and the pressure drop per unit length is large, when the measuring point is located at a high position, it takes a lot of time to charge the pressure, which will greatly slow down the time of the overall measurement project. Summary of the invention

[0004] The main purpose of the present invention is to provide a measuring device and a measuring method for determining the development height of two zones in an overburden goaf area, so as to solve the technical problem in the prior art that the independent water supply of the air bag leads to a long filling and discharging time.

[0005] In order to achieve the above object, according to one aspect of the present invention, a measuring device for measuring the height of two zones in a goaf of an overburden rock is provided, comprising:

[0006] A water supply pipe, a test pipe, a first airbag and a second airbag, wherein the first airbag and the second airbag are sleeved on the water supply pipe at intervals along the extension direction of the water supply pipe, and both the first airbag and the second airbag have an expanded state and a contracted state. The test pipe is connected to the water supply pipe and sleeved on the water supply pipe, and the test pipe is located between the first airbag and the second airbag. The test pipe is communicated with the water supply pipe, and a flow hole is provided on the peripheral wall of the test pipe;

[0007] An inflatable structure, arranged on the water supply pipe, the inflatable structure is located on a side of the first airbag away from the second airbag, the inflatable structure comprises an inflatable shell, an elastic reset member and a sealing member, the two ends of the elastic reset member are respectively connected to the inner wall of the inflatable shell and the sealing member, the sealing member is adapted to the inner periphery of the inflatable shell to separate the inflatable shell into a pressurized chamber and a connecting chamber, the first airbag and the second airbag are both connected to the connecting chamber, and the inflatable structure is provided with a water inlet connected to the water supply pipe; the water supply pipe, the test pipe, the first airbag, the second airbag and the inflatable structure are all used to be installed in the borehole to be tested;

[0008] Wherein, the seal has an initial position and a pressurized position; when the seal is in the initial position, the first airbag and the second airbag are both in the contracted state; when the water in the water supply pipe enters the pressurized chamber through the water inlet to push the seal to move from the initial position to the pressurized position, the first airbag and the second airbag are both in the expanded state.

[0009] Furthermore, the inflatable structure further comprises:

[0010] A first limiting protrusion is arranged on the inner wall of the inflatable shell and protrudes from the inner wall of the inflatable shell;

[0011] A second limiting convex portion is arranged on the inner wall of the inflatable shell and protrudes from the inner wall of the inflatable shell, the first limiting convex portion and the second limiting convex portion are arranged at intervals along the extension direction of the inflatable shell, and the second limiting convex portion is located on a side of the first limiting convex portion away from the water inlet;

[0012] Wherein, the sealing member has a first abutting position abutting against the first limiting protrusion and a second abutting position abutting against the second limiting protrusion; the initial position is located between the first abutting position and the second abutting position; when the sealing member is at the first abutting position, or at the side of the initial position close to the first abutting position, the sealing member is at the pressurized position.

[0013] Furthermore, the inflatable structure further comprises:

[0014] A third limiting protrusion is arranged on the inner wall of the inflatable housing and protrudes from the inner wall of the inflatable housing, the third limiting protrusion is arranged between the first limiting protrusion and the second limiting protrusion, and a side of the third limiting protrusion close to the first limiting protrusion has a guiding inclined surface;

[0015] The sealing member includes a main body portion and a connecting portion which are connected to each other. The connecting portion is arranged around the periphery of the main body portion, the connecting portion is adapted to the periphery of the inner wall of the inflatable shell, the thickness of the connecting portion is smaller than the thickness of the main body portion, the connecting portion is arranged opposite to the guide slope, and the sealing member has a third abutting position abutting against the second limiting protrusion.

[0016] Further, the third limiting protrusion is an annular structure; along the extension direction from the first limiting protrusion to the second limiting protrusion, the third limiting protrusion surrounds a first limiting hole segment and a second limiting hole segment connected in sequence; along the extension direction from the first limiting hole segment to the second limiting hole segment, the flow cross section of the first limiting hole segment gradually increases, and the flow cross section of the second limiting hole segment is a constant cross section; and / or,

[0017] The initial position is located between the first abutting position and the third abutting position.

[0018] Furthermore, the third limiting protrusion is an annular structure;

[0019] Wherein, the first limiting protrusion is an annular structure, a side of the first limiting protrusion away from the inner wall of the inflatable shell protrudes beyond a side of the third limiting protrusion away from the inner wall of the inflatable shell, and a side of the first limiting protrusion away from the inner wall of the inflatable shell is arranged opposite to the main body; and / or,

[0020] The second limiting protrusion is an annular structure, and the side of the second limiting protrusion away from the inner wall of the inflatable shell protrudes beyond the side of the third limiting protrusion away from the inner wall of the inflatable shell, and the side of the second limiting protrusion away from the inner wall of the inflatable shell is arranged opposite to the main body.

[0021] Further, the inflatable shell is an annular shell arranged around the periphery of the water supply pipe, and the sealing element is an annular structure; and / or,

[0022] When the sealing member is in the initial position, the space volume in the communicating cavity is greater than or equal to the sum of the gas volumes required for the first airbag and the second airbag to change from the contracted state to the expanded state; and / or,

[0023] The inflatable structure further includes a filtering structure, and the filtering structure is arranged at the water inlet.

[0024] Further, the inflatable structure comprises a first filter screen and a second filter screen, wherein the first filter screen is located on a side of the second filter screen away from the pressurized chamber;

[0025] Wherein, the mesh number of the first filter is smaller than the mesh number of the second filter; and / or,

[0026] The first filter screen and / or the second filter screen are both made of stainless steel or plastic.

[0027] Furthermore, the measuring device for determining the height of the two zones of the overburden goaf area also includes:

[0028] A drilling rig, a drill rod and a drill bit, wherein the drill bit is arranged at the end of the water supply pipe, the drill bit is located at an end of the second air bag away from the first air bag, and the drilling rig is drivingly connected to the drill bit through the drill rod.

[0029] Furthermore, the measuring device for determining the height of the two zones of the overburden goaf area also includes:

[0030] A connecting pipe, the outlet of which is connected to the water supply pipe;

[0031] A pressure flow regulator is connected to the connecting pipe, and includes a first pressure gauge, a three-way valve, a second pressure gauge and a flow meter which are sequentially arranged along the direction from the inlet of the connecting pipe to the outlet of the connecting pipe. The three-way valve has a first connecting port, a second connecting port and a water outlet. The first connecting port can be selectively connected to or disconnected from the second connecting port to supply water to the water supply pipe; or, the first connecting port can be selectively connected to or disconnected from the water outlet to discharge water in the water supply pipe.

[0032] According to another aspect of the present invention, a measurement method is provided, using the measurement device provided above, the measurement method comprising:

[0033] Putting the water supply pipe, the test pipe, the first air bag, the second air bag and the inflatable structure of the measuring device for measuring the height of the two zones of the overburden rock goaf into the borehole to be tested;

[0034] Adjusting the water supply pressure of the water supply pipe, and when the water supply pressure of the water supply pipe is stable, recording the current water supply flow rate as the initial flow rate;

[0035] After a preset time interval, the current water supply flow rate is recorded as the termination flow rate, and the leakage amount of the borehole to be tested is obtained according to the difference between the initial flow rate and the termination flow rate.

[0036] By applying the technical solution of the present invention, the measuring device in this application not only simplifies the measuring process and improves the measuring efficiency, but also quickly realizes the inflation and deflation process of the airbag, thereby improving the measuring efficiency. Moreover, by precisely controlling the expansion state of the airbag, the accuracy of the measuring result is ensured. At the same time, the use of water pressure as a power source avoids additional inflation equipment, reduces costs, and improves the portability and practicality of the device. In practical applications, the device can effectively monitor the geological changes in the goaf and provide important data support for the safe production of coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0038] Figure 1 A schematic structural diagram showing a partial structure of a measuring device for determining the height of two zones in a goaf of overburden rock provided in accordance with the first embodiment of the present invention;

[0039] Figure 2 It shows a schematic structural diagram of an inflatable structure provided according to the first embodiment of the present invention;

[0040] Figure 3 It shows a schematic structural diagram of a measuring device for determining the height of two zones in a goaf of overburden strata provided in accordance with the first embodiment of the present invention, which is installed in a borehole;

[0041] Figure 4 A schematic structural diagram of a pressure flow regulator provided according to Embodiment 1 of the present invention is shown.

[0042] The above drawings include the following reference numerals:

[0043] 10. Water supply pipe;

[0044] 20. Test tube;

[0045] 30. First airbag;

[0046] 40. Second airbag;

[0047] 50. Inflatable structure; 51. Inflatable shell; 52. Elastic reset member;

[0048] 53. sealing member; 531. main body; 532. connecting portion;

[0049] 54, first limiting convex portion; 55, second limiting convex portion; 56, third limiting convex portion; 561, guiding inclined surface;

[0050] 57. Filter structure;

[0051] 58. Water inlet; 59. Drainage outlet;

[0052] 60. Drilling machine; 70. Drill rod; 80. Drill bit; 90. Connecting pipe;

[0053] 100. Pressure flow regulator; 110. First pressure gauge; 120. Three-way valve; 130. Second pressure gauge; 140. Flow meter. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] like Figures 1 to 4 As shown, the first embodiment of the present invention provides a measuring device for measuring the height of the two zones in the overburden goaf area, and the measuring device for measuring the height of the two zones in the overburden goaf area comprises: a water supply pipe 10, a test pipe 20, a first airbag 30, a second airbag 40 and an inflatable structure 50. The first airbag 30 and the second airbag 40 are sleeved on the water supply pipe 10 at intervals along the extension direction of the water supply pipe 10, and the first airbag 30 and the second airbag 40 both have an expanded state and a contracted state. The test pipe 20 is connected to the water supply pipe 10 and sleeved on the water supply pipe 10. The test pipe 20 is located between the first airbag 30 and the second airbag 40, and the test pipe 20 is connected to the water supply pipe 10. The peripheral wall of the test pipe 20 is provided with a flow hole. The inflatable structure 50 is arranged on the water supply pipe 10. The inflatable structure 50 is located on the side of the first airbag 30 away from the second airbag 40. The inflatable structure 50 includes an inflatable shell 51, an elastic reset member 52 and a sealing member 53. The two ends of the elastic reset member 52 are respectively connected to the inner wall of the inflatable shell 51 and the sealing member 53. The sealing member 53 is adapted to the inner periphery of the inflatable shell 51 to separate the inflatable shell 51 into a pressurized chamber and a connecting chamber. The first airbag 30 and the second airbag 40 are both connected to the connecting chamber. The inflatable structure 50 is provided with a water inlet 58 connected to the water supply pipe 10; the water supply pipe 10, the test tube 20, the first airbag 30, the second airbag 40 and the inflatable structure 50 are all used to be installed in the borehole to be tested. Among them, the seal 53 has an initial position and a pressurized position; when the seal 53 is in the initial position, the first airbag 30 and the second airbag 40 are both in a contracted state; when the water in the water supply pipe 10 enters the pressurized chamber through the water inlet 58 to push the seal 53 to move from the initial position to the pressurized position, the first airbag 30 and the second airbag 40 are both in an expanded state.

[0056] The measuring device for measuring the height of the two zones of the overburden goaf provided in this embodiment is used to supply water to the inflatable structure 50 through the water supply pipe 10 that supplies high-pressure water to the test tube 20, so as to inflate or deflate the first airbag 30 and the second airbag 40, so as to shrink or expand the first airbag 30 and the second airbag 40. In this way, while the water supply pipe 10 supplies high-pressure water to the test tube 20, it can quickly supply water to the inflatable structure 50, thereby increasing the speed of inflating the airbag, so that the airbag can expand quickly, thereby facilitating a quick increase in the measurement time. Therefore, the measuring device provided in this embodiment can solve the technical problem of the long filling and discharging time caused by the independent water supply of the airbag in the prior art.

[0057] In addition, the above structure uses the water supply pipe 10 to supply water to the test tube 20 and to inflate the inflatable structure 50, which simplifies the external structure and facilitates operation. Since there is no need to set up an additional external supply channel for pressurizing the airbag (which can be water pressure or air pressure), there is no need to perform pipeline combing operations on the corresponding supply channel, nor is there a need to perform maintenance operations on the corresponding supply channel. In addition, the above structure can also make the entire test device rotate with the drill rod 70 under the drive of the drill rod 70, and there will be no problem of pipeline entanglement and the like caused by the rotation of the drill rod 70.

[0058] Specifically, the elastic return member 52 is a spring.

[0059] In this embodiment, the inflatable structure 50 further includes a first limiting protrusion 54 and a second limiting protrusion 55. The first limiting protrusion 54 is arranged on the inner wall of the inflatable housing 51 and protrudes from the inner wall of the inflatable housing 51. The second limiting protrusion 55 is arranged on the inner wall of the inflatable housing 51 and protrudes from the inner wall of the inflatable housing 51. The first limiting protrusion 54 and the second limiting protrusion 55 are arranged at intervals along the extension direction of the inflatable housing 51, and the second limiting protrusion 55 is located on the side of the first limiting protrusion 54 away from the water inlet 58. Among them, the sealing member 53 has a first abutting position abutting against the first limiting protrusion 54 and a second abutting position abutting against the second limiting protrusion 55; the initial position is located between the first abutting position and the second abutting position; when the sealing member 53 is at the first abutting position, or at the side of the initial position close to the first abutting position, the sealing member 53 is in the pressurized position. In this way, it is convenient to effectively limit the position of the sealing member 53, and avoid the situation where the sealing member 53 exceeds the position of the first limiting protrusion 54 (corresponding to the side of the first limiting protrusion 54 away from the second limiting protrusion 55) and causes excessive pressurization of the first airbag 30 and the second airbag 40, and avoid the situation where the first airbag 30 and the second airbag 40 are damaged due to excessive pressurization, and the first airbag 30 and the second airbag 40 can be better effectively protected; in addition, such a setting can also avoid the situation where the sealing member 53 exceeds the position of the second limiting protrusion 55 (corresponding to the side of the second limiting protrusion 55 away from the first limiting protrusion 54) and causes the first airbag 30 and the second airbag 40 to shrink too much, so that it will take a longer time to inflate the first airbag 30 and the second airbag 40 next time. Therefore, through the above-mentioned arrangement, it is possible to facilitate the protection of the first airbag 30 and the second airbag 40 when they are inflated, and to avoid excessive deflation of the first airbag 30 and the second airbag 40 resulting in a long inflation time for the next time, thereby ensuring that the first airbag 30 and the second airbag 40 can be inflated and deflated quickly, thereby improving the overall testing time and efficiency.

[0060] In this embodiment, the inflatable structure 50 further includes a third limiting protrusion 56, which is arranged on the inner wall of the inflatable housing 51 and protrudes from the inner wall of the inflatable housing 51, and is arranged between the first limiting protrusion 54 and the second limiting protrusion 55. The third limiting protrusion 56 has a guide slope 561 on one side close to the first limiting protrusion 54. The sealing member 53 includes a main body 531 and a connecting portion 532 connected to each other, the connecting portion 532 is arranged around the periphery of the main body 531, the connecting portion 532 is adapted to the periphery of the inner wall of the inflatable housing 51, the thickness of the connecting portion 532 is less than the thickness of the main body 531, the connecting portion 532 is arranged opposite to the guide slope 561, and the sealing member 53 has a third abutting position abutting against the second limiting protrusion 55. With such a structural setting, the connection part 532 is easier to deform relative to the main body 531, so that the connection part 532 can be deformed by the guiding effect of the guiding inclined surface 561, so as to move toward the first limiting protrusion 54 through the third limiting protrusion 56. Specifically, the above structure can facilitate the sealing member 53 to rush through the third limiting protrusion 56 under the action of high-pressure water and move toward the first abutting position, so as to continue the inflation operation of the first airbag 30 and the second airbag 40; and when the air is deflated, it will be inconvenient for the sealing member 53 to move toward the second limiting protrusion 55 over the third limiting protrusion 56, so as to avoid the situation where the position of the sealing member 53 changes too much when the water of the water-filled structure flows back, so that the first airbag 30 and the second airbag 40 can be better prevented from shrinking too much due to the water of the water-filled structure flowing back, which is not conducive to the next rapid inflation and pressurization operation.

[0061] Specifically, the sealing member 53 in this embodiment can be a disc-shaped sealing structure. The disc-shaped sealing structure is a disc-shaped sealing plug made of rubber or other corrosion-resistant elastic materials, which is thick in the middle, thin at the edges, and hollow inside. To ensure sealing, the outer diameter of the disc-shaped sealing structure should be equal to or slightly larger than the outer diameter of the inflatable structure 50, and the inner diameter of the disc-shaped sealing structure should be equal to or slightly smaller than the inner diameter of the inflatable structure 50.

[0062] Specifically, the main body 531 may also be made of hard plastic, and the connecting portion 532 may be made of soft plastic.

[0063] Specifically, the third limiting protrusion 56 is an annular structure; along the extension direction from the first limiting protrusion 54 to the second limiting protrusion 55, the third limiting protrusion 56 surrounds the first limiting hole section and the second limiting hole section connected in sequence; along the extension direction from the first limiting hole section to the second limiting hole section, the flow cross section of the first limiting hole section gradually increases, and the flow cross section of the second limiting hole section is a constant cross section. With such a structural setting, it is easy for the sealing member 53 to move toward the first limiting protrusion 54 through the third limiting protrusion 56, but not easy to move toward the second limiting protrusion 55 through the third limiting protrusion 56, so as to better limit the position of the sealing member 53 during the test process.

[0064] Specifically, the initial position is located between the first abutting position and the third abutting position, so as to better adjust and control the position of the sealing member 53 .

[0065] In this embodiment, the third limiting protrusion 56 is an annular structure with a simple structure and good limiting matching effect.

[0066] Specifically, the third limiting protrusion 56 can also be called a trapezoidal stopper. When the disc-shaped sealing structure reaches the top of the trapezoidal stopper, the pressure it receives is the pressure from the water source behind it, plus the pressure from the first airbag 30 and the second airbag 40. When the pressure from the water source behind is removed, it will be subjected to a negative suction force, giving it a downward negative pressure, and then adding the pressure from the first airbag 30 and the second airbag 40, it can be pressed down. The purpose of designing this disc-shaped sealing structure is to make it easy to go up and difficult to come down. It can quickly reach the supply pressure, and then when the water in the pipe retreats downward, it will provide a negative pressure, which can suck the disc-shaped sealing structure down. In this way, after a little water is released, the first airbag 30 and the second airbag 40 can shrink, and it is not necessary to release all the water before the first airbag 30 and the second airbag 40 can shrink effectively.

[0067] Specifically, the first limiting protrusion 54 is an annular structure, and the side of the first limiting protrusion 54 away from the inner wall of the inflatable housing 51 is protruding from the side of the third limiting protrusion 56 away from the inner wall of the inflatable housing 51, and the side of the first limiting protrusion 54 away from the inner wall of the inflatable housing 51 is arranged opposite to the main body 531. In this way, the sealing member 53 can be effectively limited, the limiting effect of the sealing member 53 is improved, and the sealing member 53 is prevented from exceeding the position of the first limiting protrusion 54.

[0068] Specifically, the second limiting protrusion 55 is an annular structure, and the side of the second limiting protrusion 55 away from the inner wall of the inflatable housing 51 is protruding from the side of the third limiting protrusion 56 away from the inner wall of the inflatable housing 51, and the side of the second limiting protrusion 55 away from the inner wall of the inflatable housing 51 is arranged opposite to the main body 531. In this way, the sealing member 53 can be effectively limited, the limiting effect of the sealing member 53 is improved, and the sealing member 53 is prevented from exceeding the position of the first limiting protrusion 54.

[0069] Specifically, the inflatable housing 51 is an annular housing arranged around the periphery of the water supply pipe 10, and the sealing member 53 is an annular structure. In this way, it is convenient to optimize the structural layout and improve the compactness of the structural layout.

[0070] Specifically, when the sealing member 53 is in the initial position, the space volume in the communication cavity is greater than or equal to the sum of the gas volumes required for the first airbag 30 and the second airbag 40 to expand from the contracted state. In this way, the first airbag 30 and the second airbag 40 can smoothly enter the expanded state from the contracted state.

[0071] Specifically, the inflatable structure 50 also includes a filtering structure 57, which is arranged at the water inlet 58 to filter the water entering the inflatable structure 50 to prevent the water from entering the inflatable structure 50 with a lot of impurities and even affecting the sealing effect of the seal 53 inside the inflatable structure 50.

[0072] In this embodiment, the inflatable structure 50 includes a first filter screen and a second filter screen, and the first filter screen is located on a side of the second filter screen away from the pressurized chamber.

[0073] Specifically, the mesh number of the first filter is smaller than the mesh number of the second filter, so as to ensure the normal water flow size while ensuring the filtering effect.

[0074] Specifically, the first filter screen and / or the second filter screen are both made of stainless steel or plastic, so that the first filter screen and the second filter screen can withstand high-pressure water, thereby ensuring the structural strength of the first filter screen and the second filter screen.

[0075] In this embodiment, the measuring device for determining the height of the two zones of the overburden goaf also includes a drill rig 60, a drill rod 70 and a drill bit 80. The drill bit 80 is arranged at the end of the water supply pipe 10. The drill bit 80 is located at the end of the second air bag 40 away from the first air bag 30. The drill rig 60 is connected to the drill bit 80 through the drill rod 70. With such a structural setting, when a hole collapses, simple drilling work can still be carried out under the drive of the drill rig 60 because there is no external pipeline. This simplifies the operation steps required for measurement and improves the efficiency of the overall test.

[0076] Specifically, the measuring device for determining the height of the two zones of the overburden goaf area also includes a connecting pipe 90 and a pressure flow regulator 100, and the outlet of the connecting pipe 90 is connected to the water supply pipe 10. The pressure flow regulator 100 is connected to the connecting pipe 90, and the pressure flow regulator 100 includes a first pressure gauge 110, a three-way valve 120, a second pressure gauge 130 and a flow meter 140 arranged in sequence from the inlet of the connecting pipe 90 to the outlet of the connecting pipe 90. The three-way valve 120 has a first connecting port, a second connecting port and a water outlet. The first connecting port can be selectively connected or disconnected with the second connecting port to supply water to the water supply pipe 10; or, the first connecting port can be selectively connected or disconnected with the water outlet to discharge the water in the water supply pipe 10. In this way, it is convenient to supply water to the water supply pipe 10, and it is also convenient to detect the amount of water loss through the pressure flow regulator 100.

[0077] Specifically, the connecting pipe 90 is used for supplying pressure.

[0078] Specifically, the spring should be in a compressed state before the pressurized water enters the inflatable structure 50, that is, the elastic force generated by the spring is equal to the pressure applied to the inflatable seal by the disc-shaped sealing structure plus the airbag. There are three limiters inside the inflatable structure 50 (corresponding to the first limit convex portion 54, the second limit convex portion 55 and the third limit convex portion 56, respectively), with the positions of the drain port 59 and the water inlet 58 as the top and the bottom, respectively, hereinafter referred to as the top and the bottom. The limiter at the top is a conventional square limiter (corresponding to the first limit convex portion 54), the limiter in the middle is a trapezoidal limiter (corresponding to the third limit convex portion 56), and the limiter at the bottom is a conventional square limiter (corresponding to the second limit convex portion 55).

[0079] Specifically, the inclined surfaces of the trapezoidal stoppers face downward and the distance between the trapezoidal stoppers is greater than that between the square stoppers.

[0080] Specifically, before the pressurized water enters the inflatable structure 50, the volume between the disc-shaped sealing structure and the trapezoidal stopper should be equal to or slightly larger than the volume of the airbag.

[0081] Preferably, the volume between the uppermost stopper and the trapezoidal stopper is much smaller than the volume of the airbag.

[0082] Preferably, a double-layer filter screen is arranged at the water inlet 58, and the mesh number of the inner layer filter screen is smaller than the mesh number of the outer layer filter screen.

[0083] Preferably, the double-layer filter screen arranged at the water inlet 58 is made of stainless steel or corrosion-resistant high-strength plastic.

[0084] Preferably, the wall of the test tube 20 is designed with flow holes to achieve the purpose of injecting water into the drilled hole.

[0085] Preferably, the medium disc-shapedly sealed into the first airbag 30 and the second airbag 40 is air or carbon dioxide.

[0086] When the pressurized water is transmitted to the double-ended water plug through the drill pipe 70, the water will enter the inflatable structure 50 under the action of pressure due to the small pipeline of the test tube 20 and the limited pressure relief capacity of the hole. Under the action of pressure, the disc-shaped sealing structure of the inflatable structure 50 will move upward, and the combination of the trapezoidal stopper and the disc-shaped seal will make it easier for the disc-shaped seal to pass from bottom to top, but not from top to bottom. Only when there is a large difference in the force between the upper and lower parts of the disc-shaped seal, the disc-shaped seal can be displaced and move downward.

[0087] Preferably, when the disc seal is above the trapezoidal stopper, the spring is in a stretched state, that is, the spring is in a compressed state when the pressurized water does not enter the inflatable structure 50, and is in a stretched state when the disc seal is above the trapezoidal stopper.

[0088] Preferably, the drill bit 80 is connected to the first airbag 30 via an interface, and the drill bit 80 is a solid drill bit 80 .

[0089] Preferably, the diameter of the drill bit 80 should be equal to or slightly smaller than the diameter of the drill hole.

[0090] Preferably, the diameters of the first airbag 30 and the second airbag 40 after contraction should be smaller than the diameter of the drill bit 80 .

[0091] Preferably, the cross-sectional width of the inflatable structure 50 should be smaller than the hole diameter.

[0092] When using this test device to measure the height of two belts, it is necessary to first fix the double-end water blocking structure (including the water supply pipe 10, the test pipe 20, the first airbag 30 and the second airbag 40) to the front end of the drilling rig 60 and the drill rod 70, and place the double-end water blocking structure in a predetermined position by means of the drilling rig 60. Then, water or pressurized gas is delivered to the double-end water blocking structure through the pressure supply pipe, the pressure flow regulator 100 and the drilling rig 60 in sequence. The high-pressure water flow will flow into the inflatable structure 50 under the action of pressure, and the internal disc-shaped sealing structure will move toward the first airbag 30 under the action of the pressure difference until it reaches the bottom of the first limiting protrusion 54 of the inflatable structure 50. The fluid pressed into the disc-shaped seal will cause the first airbag 30 and the first airbag 30 to expand, thereby achieving the purpose of blocking. The high-pressure water flow provided by the pressure supply pipe can not only provide the first airbag 30 and the second airbag 40 with inflation pressure, but also drain water into the borehole through the test pipe 20. The amount of water discharged by the test pipe 20 is the leakage amount, which is an important physical quantity to characterize the degree of development of the fracture and the core data to judge the development height of the two zones. When the experiment is over, the pressure supply pipe to the equipment is stopped, and the water flow inside the equipment will quickly transfer to the bottom under the action of gravity. As the pressure response end, the disc seal inside the inflatable structure 50 will quickly move toward the water inlet 58 under the action of the pressure difference. Under this action, the first airbag 30 and the second airbag 40 will shrink, which is convenient for the displacement of the overall double-end water plugging structure. In addition, a drill bit 80 is designed on the top of the double-end water plugging structure. When encountering a hole collapse, due to the absence of external pipelines, the plugging device can perform simple drilling work under the push of the drilling rig 60. With such a design, the present invention can simplify the operating steps required for measurement and improve the efficiency of the overall test.

[0093] The second embodiment of the present invention provides a measurement method, using the measurement device provided above, the measurement method includes: sending the water supply pipe 10, the test pipe 20, the first air bag 30, the second air bag 40 and the inflatable structure 50 of the measurement device for measuring the height of the two zones of the overburden goaf area into the borehole to be tested; adjusting the water supply pressure of the water supply pipe 10, and when the water supply pressure of the water supply pipe 10 is stable, recording the current water supply flow rate as the initial flow rate; after a preset interval, recording the current water supply flow rate as the termination flow rate, and obtaining the leakage amount of the borehole to be tested according to the difference between the initial flow rate and the termination flow rate. In this way, it is easy to realize the detection of the leakage amount of the goaf, and improve the measurement efficiency.

[0094] The test method specifically includes the following steps:

[0095] The first step is to connect the double-end water blocking structure, the drilling rig 60, the pressure and flow regulator, and the pressure supply pipe in sequence.

[0096] The second step is to open the pressure supply pipe to allow high-pressure water to enter the double-end water blocking structure, and observe whether the first airbag 30 and the second airbag 40 of the double-end water blocking structure can inflate normally. If the first airbag 30 and the second airbag 40 can inflate normally, close the pressure supply pipe, open the three-way valve 120 of the pressure flow regulator 100 to release the water flow in the equipment, and shrink the first airbag 30 and the second airbag 40 to a normal contracted state.

[0097] The third step is to deliver the double-ended water plugging structure to the predetermined position of the borehole through the drilling rig 60.

[0098] Step 4: Open the pressure supply pipe and adjust the three-way valve 120 so that the reading of the first pressure gauge 110 reaches the predetermined requirement. Wait for a while. When the reading of the second pressure gauge 130 stabilizes, record the current pressure and the value of the flow meter 140 on the flow regulator as the initial flow.

[0099] Step 5. Wait for 3-5 minutes and record the flow rate reading at this time as the termination flow rate. The difference between the initial flow rate and the termination flow rate is the leakage amount of the measurement area.

[0100] Step 6. Repeat step 5 to observe whether there is a large difference between the two leakage amounts. If there is a large difference, a third measurement is required. If there is basically no difference between the two leakage amounts, the pressure supply pipe can be closed and the three-way valve 120 of the pressure flow regulator 100 can be opened to release the water flow in the equipment.

[0101] Step 7: Due to the presence of the inflatable structure 50, the first airbag 30 and the second airbag 40 can be contracted without draining the water in the drill pipe 70. After waiting for a period of time, the double-ended water plugging structure is delivered to the next measurement area by the drilling rig 60 and steps 5 and 6 are repeated.

[0102] Step 8. Summarize the leakage at each measurement location and calculate the development height of the two zones in the area based on the obtained data.

[0103] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the present invention improves the efficiency of filling and discharging water in the airbag by optimizing the equipment structure, can effectively reduce the operation steps, and reduce the labor intensity of the measurement personnel. In addition, by attaching a drill bit externally, the problem that the traditional equipment needs to be disassembled and re-operated when the hole collapses is solved. The improved two-band height measurement device and method provided by the present invention, which is supplied with water by a single pipeline, abandons the design of the airbag independent pipeline water supply of the traditional double-end water plugging device, integrates the airbag water supply pipeline, and uses the drill pipe as the test pipeline to supply water and pressure for the airbag. The structure and operation steps are simpler than the traditional double-end water plugging device. The inflation structure design provided by the present invention completely relies on the pressure difference between the airbag and the pressure water to achieve the purpose. The principle is reliable, no power supply and hazardous substances are used, and it has strong anti-interference ability. It is suitable for underground measurement projects under various conditions. And due to the advantages of the pipeline design, when the drill pipe starts to drain water, the airbag can quickly respond to pressure, so as to achieve the purpose of rapid drainage and improved measurement efficiency. The double-ended water plug of the present invention uses air and water as two media for pressure control. Since the density of air is lower than that of water, it is not easy to leak during the movement of the disc seal. In addition, the space between the upper stopper and the trapezoidal stopper also ensures that there is redundant space for the airbag to be not broken, thus ensuring the reliability of the airbag sealing. The drill bit design ensures that the equipment can continue to operate without completely withdrawing the double-ended water plug in the event of a hole collapse, thus achieving the purpose of improving efficiency.

[0104] In addition, the test device can also simplify the measurement steps and effectively reduce the labor intensity of technicians. Moreover, the technology simplifies the equipment structure and reduces the possibility of problems by optimizing the water supply method, and provides a technical solution to solve the hole collapse and hole blockage problems without disassembling the equipment.

[0105] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0106] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0107] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0108] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0109] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A measuring device for determining the height of two zones in the overburden goaf, characterized in that: include: A water supply pipe (10), a test pipe (20), a first airbag (30) and a second airbag (40), wherein the first airbag (30) and the second airbag (40) are sleeved on the water supply pipe (10) at intervals along the extension direction of the water supply pipe (10), and the first airbag (30) and the second airbag (40) both have an expanded state and a contracted state, the test pipe (20) is connected to the water supply pipe (10) and sleeved on the water supply pipe (10), the test pipe (20) is located between the first airbag (30) and the second airbag (40), the test pipe (20) is in communication with the water supply pipe (10), and a flow hole is provided on the peripheral wall of the test pipe (20); An inflatable structure (50) is arranged on the water supply pipe (10), the inflatable structure (50) is located on a side of the first airbag (30) away from the second airbag (40), the inflatable structure (50) comprises an inflatable shell (51), an elastic return member (52) and a sealing member (53), the two ends of the elastic return member (52) are respectively connected to the inner wall of the inflatable shell (51) and the sealing member (53), the sealing member (53) is connected to the inflatable shell (51) and ... two ends of the elastic return member (52) are respectively connected to the inflatable shell (51) and The inner periphery of the test tube (20) is adapted to separate the inflatable shell (51) into a pressurized chamber and a communicating chamber, the first airbag (30) and the second airbag (40) are both communicated with the communicating chamber, and the inflatable structure (50) is provided with a water inlet (58) communicated with the water supply pipe (10); the water supply pipe (10), the test tube (20), the first airbag (30), the second airbag (40) and the inflatable structure (50) are all used to be installed in the borehole to be tested; The sealing member (53) has an initial position and a pressurized position; when the sealing member (53) is in the initial position, the first airbag (30) and the second airbag (40) are both in the contracted state; when water in the water supply pipe (10) enters the pressurized chamber through the water inlet (58) to push the sealing member (53) to move from the initial position to the pressurized position, the first airbag (30) and the second airbag (40) are both in the expanded state.

2. The measuring device for determining the height of the two zones of the overburden rock goaf according to claim 1 is characterized in that: The inflatable structure (50) further comprises: A first limiting protrusion (54) is arranged on the inner wall of the inflatable shell (51) and protrudes from the inner wall of the inflatable shell (51); a second limiting protrusion (55) arranged on the inner wall of the inflatable housing (51) and protruding from the inner wall of the inflatable housing (51); the first limiting protrusion (54) and the second limiting protrusion (55) are arranged at intervals along the extension direction of the inflatable housing (51); and the second limiting protrusion (55) is located on a side of the first limiting protrusion (54) away from the water inlet (58); Wherein, the sealing member (53) has a first abutting position abutting against the first limiting protrusion (54) and a second abutting position abutting against the second limiting protrusion (55); the initial position is located between the first abutting position and the second abutting position; when the sealing member (53) is at the first abutting position, or at a side of the initial position close to the first abutting position, the sealing member (53) is at the pressurized position.

3. The measuring device for determining the height of the two zones of the overburden rock goaf according to claim 2 is characterized in that: The inflatable structure (50) further comprises: a third limiting protrusion (56) arranged on the inner wall of the inflatable housing (51) and protruding from the inner wall of the inflatable housing (51); the third limiting protrusion (56) is arranged between the first limiting protrusion (54) and the second limiting protrusion (55); and a side of the third limiting protrusion (56) close to the first limiting protrusion (54) has a guiding inclined surface (561); The sealing member (53) comprises a main body (531) and a connecting portion (532) which are connected to each other. The connecting portion (532) is arranged around the periphery of the main body (531). The connecting portion (532) is adapted to the periphery of the inner wall of the inflatable shell (51). The thickness of the connecting portion (532) is smaller than the thickness of the main body (531). The connecting portion (532) is arranged opposite to the guiding inclined surface (561). The sealing member (53) has a third abutting position abutting against the second limiting protrusion (55).

4. The measuring device for determining the height of the two zones of the overburden rock goaf according to claim 3 is characterized in that: The third limiting protrusion (56) is an annular structure; along the extension direction from the first limiting protrusion (54) to the second limiting protrusion (55), the third limiting protrusion (56) encloses a first limiting hole segment and a second limiting hole segment which are connected in sequence; along the extension direction from the first limiting hole segment to the second limiting hole segment, the flow cross section of the first limiting hole segment gradually increases, and the flow cross section of the second limiting hole segment is a constant cross section; and / or, The initial position is located between the first abutting position and the third abutting position.

5. The measuring device for determining the height of the two zones of the overburden rock goaf according to claim 3 is characterized in that: The third limiting protrusion (56) is an annular structure; Wherein, the first limiting protrusion (54) is an annular structure, a side of the first limiting protrusion (54) away from the inner wall of the inflatable shell (51) is protruding from a side of the third limiting protrusion (56) away from the inner wall of the inflatable shell (51), and a side of the first limiting protrusion (54) away from the inner wall of the inflatable shell (51) is arranged opposite to the main body (531); and / or, The second limiting protrusion (55) is an annular structure, and the side of the second limiting protrusion (55) away from the inner wall of the inflatable shell (51) is protruding from the side of the third limiting protrusion (56) away from the inner wall of the inflatable shell (51), and the side of the second limiting protrusion (55) away from the inner wall of the inflatable shell (51) is arranged opposite to the main body (531).

6. The measuring device for determining the height of the two zones of the overburden rock goaf according to claim 1 is characterized in that: The inflatable shell (51) is an annular shell arranged around the periphery of the water supply pipe (10), and the sealing element (53) is an annular structure; and / or, When the sealing member (53) is in the initial position, the spatial volume in the communicating cavity is greater than or equal to the sum of the gas volumes required for the first airbag (30) and the second airbag (40) to change from the contracted state to the expanded state; and / or, The inflatable structure (50) further comprises a filtering structure (57), wherein the filtering structure (57) is arranged at the water inlet (58).

7. The measuring device for determining the height of the two zones of the overburden rock goaf according to claim 1 is characterized in that: The inflatable structure (50) comprises a first filter screen and a second filter screen, wherein the first filter screen is located on a side of the second filter screen away from the pressurized chamber; Wherein, the mesh number of the first filter is smaller than the mesh number of the second filter; and / or, The first filter screen and / or the second filter screen are both made of stainless steel or plastic.

8. The measuring device for determining the height of the two zones of the overburden rock goaf according to claim 1 is characterized in that: The measuring device for determining the height of the two zones of the overburden goaf area also includes: A drilling rig (60), a drill rod (70) and a drill bit (80), wherein the drill bit (80) is arranged at the end of the water supply pipe (10), the drill bit (80) is located at an end of the second air bag (40) away from the first air bag (30), and the drilling rig (60) is drivingly connected to the drill bit (80) through the drill rod (70).

9. The measuring device for determining the height of the two zones of the overburden rock goaf according to claim 1 is characterized in that: The measuring device for determining the height of the two zones of the overburden goaf area also includes: A connecting pipe (90), the outlet of the connecting pipe (90) being connected to the water supply pipe (10); A pressure flow regulator (100) is connected to the connecting pipe (90), and comprises a first pressure gauge (110), a three-way valve (120), a second pressure gauge (130) and a flow meter (140) which are arranged in sequence from the inlet of the connecting pipe (90) to the outlet of the connecting pipe (90), and the three-way valve (120) has a first connecting port, a second connecting port and a water outlet, and the first connecting port can be selectively connected to or disconnected from the second connecting port to supply water to the water supply pipe (10); or the first connecting port can be selectively connected to or disconnected from the water outlet to discharge water in the water supply pipe (10).

10. A measurement method, characterized in that: The measuring device for measuring the height of the two zones in the overburden goaf area according to any one of claims 1 to 9 is used, and the measuring method comprises: Putting the water supply pipe, the test pipe, the first air bag, the second air bag and the inflatable structure of the measuring device for measuring the height of the two zones of the overburden rock goaf into the borehole to be tested; Adjusting the water supply pressure of the water supply pipe, and when the water supply pressure of the water supply pipe is stable, recording the current water supply flow rate as the initial flow rate; After a preset time interval, the current water supply flow rate is recorded as the termination flow rate, and the leakage amount of the borehole to be tested is obtained according to the difference between the initial flow rate and the termination flow rate.

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