Measuring device and method for measuring height of two zones in goaf of overburden rock

Abstract

The application provides a measuring device and a measuring method for determining the development height of two zones in a goaf of overburden rock, comprising 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 being spaced apart and sleeved on the water supply pipe along the extension direction of the water supply pipe, and the first air bag and the second air bag each having an expanded state and a contracted state; an inflation structure comprising an inflation shell, an elastic return member and a sealing member, the two ends of the elastic return member being connected with the inner wall of the inflation shell and the sealing member respectively, and the sealing member being adapted to the inner periphery of the inflation shell; when the sealing member is in an initial position, the first air bag and the second air bag are each in the contracted state; when water in the water supply pipe enters a pressurizing cavity through a water inlet to push the sealing member to move from the initial position to a pressurizing position, the first air bag and the second air bag are each in the expanded state. Through the technical scheme provided by the application, the technical problem of long water filling and discharging time caused by independent water supply of the air bag in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of measuring the development height of the two zones in a goaf, and more specifically, to a measuring device and method for measuring the development height of the two zones in an overburden goaf. Background Technology

[0002] As my country's coal resources extend deeper into the region, more complex geological conditions present new challenges to coal mining technology. In response, the nation and society have placed higher demands on coal mine safety. Because the hydrogeological conditions vary across different mining areas, theoretical calculations alone cannot fully meet the needs of safe coal mine production. Therefore, reliable field measurements are essential for on-site production. Traditional methods for observing the development height of two coal zones mainly include borehole drilling, geophysical exploration, and double-ended water-blocking device measurement. Among these, double-ended water-blocking device measurement offers the highest accuracy but is also the most cumbersome. Optimizing the double-ended water-blocking measurement equipment and methods without compromising accuracy can effectively improve the efficiency of testing personnel and reduce testing time, which is of practical significance for on-site production.

[0003] Most existing dual-end water-blocking technologies use an independent airbag water supply method. Because the airbag pressure supply pipe has a small diameter and a large pressure drop per unit length, when the measurement point is located at a high position, pressurization takes a lot of time, which greatly slows down the overall measurement project. Summary of the Invention

[0004] The main objective of this invention is to provide a measuring device and method for determining the development height of two zones in a goaf overburden area, in order to solve the technical problem of long filling and draining times caused by independent water supply of airbags in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a measuring device for determining the development height of two zones in an overburden goaf area is provided, comprising:

[0006] The water supply pipe, the test pipe, the first airbag and the second airbag are spaced apart on the water supply pipe along the extension direction of the water supply pipe. The first airbag and the second airbag have an inflated state and a contracted state. The test pipe is connected to the water supply pipe and is spaced on the water supply pipe. The test pipe is located between the first airbag and the second airbag and is in communication with the water supply pipe. A flow hole is provided on the peripheral wall of the test pipe.

[0007] An inflatable structure is provided on the water supply pipe. The inflatable structure is located on the side of the first airbag away from the second airbag. The inflatable structure includes 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 divide the inflatable shell into a pressurization chamber and a communication chamber. Both the first airbag and the second airbag are in communication with the communication chamber. The inflatable structure is provided with a water inlet that is in communication with 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] The sealing element has an initial position and a pressurized position; when the sealing element is in the initial position, both the first airbag and the second airbag are in the contracted state; when water in the water supply pipe enters the pressurized chamber through the water inlet to push the sealing element from the initial position to the pressurized position, both the first airbag and the second airbag are in the inflated state.

[0009] Furthermore, the inflatable structure also includes:

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

[0011] The second limiting protrusion is disposed on the inner wall of the inflatable housing and protrudes from the inner wall of the inflatable housing. The first limiting protrusion and the second limiting protrusion are spaced apart along the extending direction of the inflatable housing. The second limiting protrusion is located on the side of the first limiting protrusion away from the water inlet.

[0012] The sealing member has a first abutting position that abuts against the first limiting protrusion and a second abutting position that abuts 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 in the first abutting position or in the initial position on the side closer to the first abutting position, the sealing member is in the pressurized position.

[0013] Furthermore, the inflatable structure also includes:

[0014] The third limiting protrusion is disposed on the inner wall of the inflatable shell and protrudes from the inner wall of the inflatable shell. The third limiting protrusion is disposed between the first limiting protrusion and the second limiting protrusion. The side of the third limiting protrusion closest to the first limiting protrusion has a guide slope.

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

[0016] Furthermore, the third limiting protrusion is an annular structure; along the extending direction from the first limiting protrusion to the second limiting protrusion, the third limiting protrusion forms a first limiting hole segment and a second limiting hole segment connected in sequence; along the extending 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 contact position and the third contact position.

[0018] Furthermore, the third limiting protrusion has a ring structure;

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

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

[0021] Furthermore, the inflatable housing is a circumferential housing surrounding the periphery of the water supply pipe, and the sealing element is a circumferential structure; and / or,

[0022] When the seal is in the initial position, the volume of the space within the communicating cavity is greater than or equal to the sum of the gas volumes required for both the first and second airbags to expand from the contracted state; and / or,

[0023] The inflation structure also includes a filter structure, which is located at the water inlet.

[0024] Furthermore, the inflation structure includes a first filter and a second filter, wherein the first filter is located on the side of the second filter away from the pressurization chamber;

[0025] Wherein, the mesh count of the first filter screen is less than the mesh count of the second filter screen; 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 development height of the two zones in the overburden goaf also includes:

[0028] The drilling rig, drill rod, and drill bit are provided. The drill bit is located at the end of the water supply pipe and at the end of the second airbag away from the first airbag. The drilling rig is driven to the drill bit via the drill rod.

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

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

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

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

[0033] The water supply pipe, test pipe, first airbag, second airbag, and inflation structure of the measuring device for determining the development height of the two zones in the overburden goaf are sent into the borehole to be tested.

[0034] Adjust the water supply pressure of the water supply pipe, and when the water supply pressure of the water supply pipe is stable, record 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 based on the difference between the initial flow rate and the termination flow rate.

[0036] By applying the technical solution of this invention, the measuring device in this application not only simplifies the measurement process and improves measurement efficiency by rapidly inflating and deflating the airbag, thus enhancing measurement efficiency, but also ensures the accuracy of the measurement results by precisely controlling the inflation state of the airbag. Furthermore, using water pressure as the power source avoids the need for additional inflation equipment, reduces costs, and improves the portability and practicality of the device. In practical applications, this device can effectively monitor geological changes in goaf areas, providing crucial data support for safe coal mine production. Attached Figure Description

[0037] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0038] Figure 1 A schematic diagram of a portion of the structure of a measuring device for determining the development height of two zones in a goaf area provided according to Embodiment 1 of the present invention is shown.

[0039] Figure 2 A schematic diagram of the inflatable structure provided according to Embodiment 1 of the present invention is shown;

[0040] Figure 3 A schematic diagram of the structure of the measuring device for determining the development height of two zones in a goaf area according to Embodiment 1 of the present invention is shown, installed inside a borehole.

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

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

[0043] 10. Water supply pipes;

[0044] 20. Test tube;

[0045] 30. First airbag;

[0046] 40. Second airbag;

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

[0048] 53. Sealing element; 531. Main body; 532. Connecting part;

[0049] 54. First limiting protrusion; 55. Second limiting protrusion; 56. Third limiting protrusion; 561. Guide slope;

[0050] 57. Filter structure;

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

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

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

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] like Figures 1 to 4 As shown, Embodiment 1 of the present invention provides a measuring device for determining the development height of two zones in an overburden goaf. The measuring device includes: a water supply pipe 10, a test tube 20, a first airbag 30, a second airbag 40, and an inflation structure 50. The first airbag 30 and the second airbag 40 are spaced apart on the water supply pipe 10 along its extension direction. Both the first airbag 30 and the second airbag 40 have an inflated state and a contracted state. The test tube 20 is connected to the water supply pipe 10 and is sleeved on it. The test tube 20 is located between the first airbag 30 and the second airbag 40 and is connected to the water supply pipe 10. A flow hole is provided on the peripheral wall of the test tube 20. An inflation structure 50 is installed on the water supply pipe 10. The inflation structure 50 is located on the side of the first airbag 30 away from the second airbag 40. The inflation structure 50 includes an inflation shell 51, an elastic reset member 52, and a sealing member 53. The two ends of the elastic reset member 52 are connected to the inner wall of the inflation shell 51 and the sealing member 53, respectively. The sealing member 53 is adapted to the inner periphery of the inflation shell 51 to divide the inflation shell 51 into a pressurization chamber and a communication chamber. The first airbag 30 and the second airbag 40 are both connected to the communication chamber. The inflation structure 50 is provided with a water inlet 58 that is connected to the water supply pipe 10. The water supply pipe 10, the test pipe 20, the first airbag 30, the second airbag 40, and the inflation structure 50 are all used to be installed in the borehole to be tested. The sealing element 53 has an initial position and a pressurized position. When the sealing element 53 is in the initial position, both the first airbag 30 and the second airbag 40 are in a contracted state. When water in the water supply pipe 10 enters the pressurized chamber through the water inlet 58 to push the sealing element 53 from the initial position to the pressurized position, both the first airbag 30 and the second airbag 40 are in an inflated state.

[0056] The measuring device for determining the development height of two zones in an overburden goaf provided in this embodiment supplies water to the inflatable structure 50 via a water supply pipe 10 that supplies high-pressure water to the test tube 20. This inflates or deflates the first airbag 30 and the second airbag 40, causing them to contract or expand. Thus, while the water supply pipe 10 supplies high-pressure water to the test tube 20, water can be rapidly supplied to the inflatable structure 50, increasing the inflation speed of the airbags and allowing them to expand quickly, thereby facilitating faster measurement. Therefore, the measuring device provided in this embodiment solves the technical problem of long inflation and deflation times caused by independent water supply to the airbags in the prior art.

[0057] Furthermore, the aforementioned structure simplifies the external structure and facilitates operation by allowing water to be supplied to the test tube 20 and air to be inflated into the air-filled structure 50 via the water supply pipe 10. Since there is no need for an additional external supply channel to pressurize the air bladder (either with water or air pressure), there is no need for pipework maintenance or repair of the corresponding supply channel. Moreover, the aforementioned structure allows the entire testing device to rotate with the drill rod 70, preventing pipe entanglement that could occur during rotation.

[0058] Specifically, the elastic reset element 52 is a spring.

[0059] In this embodiment, the inflation structure 50 further includes a first limiting protrusion 54 and a second limiting protrusion 55. The first limiting protrusion 54 is disposed on the inner wall of the inflation housing 51 and protrudes from the inner wall of the inflation housing 51. The second limiting protrusion 55 is disposed on the inner wall of the inflation housing 51 and protrudes from the inner wall of the inflation housing 51. The first limiting protrusion 54 and the second limiting protrusion 55 are spaced apart along the extending direction of the inflation 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. 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 in the first abutting position, or in the initial position on the side closer to the first abutting position, the sealing member 53 is in a pressurized position. This design effectively limits the position of the seal 53, preventing excessive pressure on the first airbag 30 and the second airbag 40 due to the seal 53 exceeding 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). This avoids damage to the first airbag 30 and the second airbag 40 due to excessive pressure, and provides better protection for them. Furthermore, this design also prevents the first airbag 30 and the second airbag 40 from shrinking excessively due to the seal 53 exceeding 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). This would result in a longer inflating time for the first airbag 30 and the second airbag 40 the next time. Therefore, the above settings not only facilitate the protection of the first airbag 30 and the second airbag 40 when they are inflated, but also prevent excessive deflation of the first airbag 30 and the second airbag 40, which would lead to an excessively long inflation time next time. This ensures 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 inflation structure 50 further includes a third limiting protrusion 56, which is disposed on the inner wall of the inflation housing 51 and protrudes from the inner wall of the inflation housing 51. The third limiting protrusion 56 is disposed between the first limiting protrusion 54 and the second limiting protrusion 55. The side of the third limiting protrusion 56 closest to the first limiting protrusion 54 has a guide slope 561. The sealing member 53 includes a main body portion 531 and a connecting portion 532 connected to each other. The connecting portion 532 is disposed around the periphery of the main body portion 531 and is adapted to the periphery of the inner wall of the inflation housing 51. The thickness of the connecting portion 532 is less than the thickness of the main body portion 531. The connecting portion 532 is disposed opposite to the guide slope 561. The sealing member 53 has a third abutting position that abuts against the second limiting protrusion 55. This structural design allows the connecting portion 532 to deform more easily relative to the main body 531. This deformation, guided by the guide slope 561, allows the connecting portion 532 to move towards the first limiting protrusion 54 via the third limiting protrusion 56. Specifically, this structure facilitates the sealing member 53's movement towards the first contact position under high-pressure water pressure, allowing for continued inflation of the first airbag 30 and the second airbag 40. However, during deflation, it prevents the sealing member 53 from moving past the third limiting protrusion 56 towards the second limiting protrusion 55, avoiding excessive positional changes in the sealing member 53 due to water backflow during the inflation process. This better prevents the first airbag 30 and the second airbag 40 from shrinking excessively due to water backflow during the inflation process, which would hinder rapid inflation and pressurization in the future.

[0061] Specifically, in this embodiment, the sealing element 53 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 material, thick in the middle, thin at the edges, and hollow inside. To ensure sealing performance, 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 be made of rigid plastic, and the connecting part 532 may be made of soft plastic.

[0063] Specifically, the third limiting protrusion 56 is an annular structure; along the extending direction from the first limiting protrusion 54 to the second limiting protrusion 55, the third limiting protrusion 56 forms a first limiting hole segment and a second limiting hole segment connected in sequence; along the extending 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, while the flow cross-section of the second limiting hole segment is a constant cross-section. This structural arrangement facilitates the movement of the sealing element 53 from the third limiting protrusion 56 towards the first limiting protrusion 54, but makes it less convenient for it to move from the third limiting protrusion 56 towards the second limiting protrusion 55, thus better limiting the position of the sealing element 53 during testing.

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

[0065] In this embodiment, the third limiting protrusion 56 is a ring structure, which is simple in structure and has a good limiting effect.

[0066] Specifically, the third limiting protrusion 56, also known as the trapezoidal limiter, is subjected to pressure from the water source behind the disc-shaped sealing structure when it reaches the trapezoidal limiter. This pressure is combined with the pressure from the first airbag 30 and the second airbag 40. When the pressure from the water source is removed, a negative suction force is applied, creating a downward negative pressure. This, combined with the pressure from the first airbag 30 and the second airbag 40, pushes the structure down. The purpose of this disc-shaped sealing structure design is to make it easy to move up but difficult to move down. It allows for rapid pressure supply, and as the water in the pipe recedes, it provides a negative pressure that draws the disc-shaped sealing structure down. This allows the first airbag 30 and the second airbag 40 to contract after releasing a small amount of water, without requiring all the water to be released before they can effectively contract.

[0067] Specifically, the first limiting protrusion 54 has an annular structure. The side of the first limiting protrusion 54 away from the inner wall of the inflatable housing 51 protrudes beyond the side of the third limiting protrusion 56 away from the inner wall of the inflatable housing 51. The side of the first limiting protrusion 54 away from the inner wall of the inflatable housing 51 is opposite to the main body 531. This facilitates effective limiting of the sealing member 53, improves the limiting effect of the sealing member 53, and prevents the sealing member 53 from exceeding the position of the first limiting protrusion 54.

[0068] Specifically, the second limiting protrusion 55 has an annular structure. The side of the second limiting protrusion 55 away from the inner wall of the inflatable housing 51 protrudes beyond the side of the third limiting protrusion 56 away from the inner wall of the inflatable housing 51. The side of the second limiting protrusion 55 away from the inner wall of the inflatable housing 51 is opposite to the main body 531. This facilitates effective limiting of the sealing member 53, improves the limiting effect of the sealing member 53, and prevents the sealing member 53 from exceeding the position of the first limiting protrusion 54.

[0069] Specifically, the inflatable shell 51 is a circumferential shell surrounding the periphery of the water supply pipe 10, and the sealing element 53 is a circumferential structure. This facilitates optimization of the structural layout and improves the compactness of the structural layout.

[0070] Specifically, when the seal 53 is in its initial position, the volume of space within the communicating cavity is greater than or equal to the sum of the gas volumes required for both the first airbag 30 and the second airbag 40 to transition from a contracted state to an inflated state. This facilitates the smooth transition of the first airbag 30 and the second airbag 40 from a contracted state to an inflated state.

[0071] Specifically, the inflation structure 50 also includes a filter structure 57, which is located at the water inlet 58 to filter the water entering the inflation structure 50, so as to avoid the water entering the inflation structure 50 having too many impurities or even affecting the sealing effect of the seal 53 inside the inflation structure 50.

[0072] In this embodiment, the inflation structure 50 includes a first filter and a second filter, with the first filter located on the side of the second filter away from the pressurization chamber.

[0073] Specifically, the mesh size of the first filter screen is smaller than that of the second filter screen, so as to ensure the normal water flow while maintaining the filtration effect.

[0074] Specifically, the first filter screen and / or the second filter screen are both made of stainless steel or plastic. This allows the first and second filter screens to withstand high-pressure water, ensuring their structural strength.

[0075] In this embodiment, the measuring device for determining the development height of the two zones in the overburden goaf further includes a drilling rig 60, a drill rod 70, and a drill bit 80. The drill bit 80 is located at the end of the water supply pipe 10, at the end of the second airbag 40 furthest from the first airbag 30. The drilling rig 60 is driven by the drill rod 70 and the drill bit 80. This structural arrangement allows for simple drilling work to be carried out even in the event of borehole collapse, as there are no external pipelines present. This simplifies the measurement process and improves the overall testing efficiency.

[0076] Specifically, the measuring device for determining the development height of the two zones in the overburden goaf also includes a connecting pipe 90 and a pressure-flow regulator 100. 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 includes a first pressure gauge 110, a three-way valve 120, a second pressure gauge 130, and a flow meter 140 arranged sequentially along the direction from the inlet 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 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 from the water supply pipe 10. This facilitates the supply of water to the water supply pipe 10 and also facilitates the detection of water leakage through the pressure-flow regulator 100.

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

[0078] Specifically, the spring should be in a compressed state before the pressurized water enters the inflation structure 50, meaning the spring force is equal to the pressure exerted on the disc seal by the disc seal structure plus the airbag. The inflation structure 50 contains three limiters (corresponding to the first limit protrusion 54, the second limit protrusion 55, and the third limit protrusion 56), with the locations of the drain outlet 59 and the inlet 58 designated as the upper and lower, respectively, hereinafter referred to as the upper and lower. The uppermost limiter is a conventional square limiter (corresponding to the first limit protrusion 54), the middle limiter is a trapezoidal limiter (corresponding to the third limit protrusion 56), and the lowermost limiter is a conventional square limiter (corresponding to the second limit protrusion 55).

[0079] Specifically, the inclined surface of the trapezoidal limiter faces downward and the distance between the trapezoidal limiters is greater than that between the square limiters.

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

[0081] Preferably, the volume between the uppermost limiter and the trapezoidal limiter should be much smaller than the volume of the airbag.

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

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

[0084] Preferably, the test tube 20 is designed with a flow hole in its wall to allow water to be injected into the borehole.

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

[0086] When pressurized water is transmitted to the double-ended water plug through the drill rod 70, due to the small pipe size and limited pressure relief capacity of the test tube 20, the water will enter the inflation structure 50 under pressure. Under pressure, the disc-shaped sealing structure of the inflation structure 50 will move upward. The combination of the trapezoidal limiter and the disc-shaped seal makes 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 on the upper and lower parts of the disc-shaped seal can it be displaced and move downward.

[0087] Preferably, the spring is in a stretched state when the disc seal is above the trapezoidal limiter. That is, the spring is in a compressed state when the pressurized water has not entered the inflation structure 50, and in a stretched state when the disc seal is above the trapezoidal limiter.

[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 borehole.

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

[0091] Preferably, the width of the inflatable structure 50 cross-section should be smaller than the aperture.

[0092] When using this testing device to measure the height of two belts, the double-ended water-blocking structure (including the water supply pipe 10, test pipe 20, first airbag 30, and second airbag 40) must first be fixed to the front end of the drill rig 60 and drill rod 70. The drill rig 60 then positions the double-ended water-blocking structure in the predetermined position. Water or pressurized gas is then delivered to the double-ended water-blocking structure sequentially via the pressure supply pipe, pressure and flow regulator 100, and drill rig 60. The high-pressure water flow will flow into the inflatable structure 50 under pressure, and the internal disc-shaped sealing structure will move towards the first airbag 30 under the pressure difference until it reaches below 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 40 to expand, achieving the purpose of sealing. The high-pressure water flow provided by the pressure supply pipe not only provides inflation pressure for the first airbag 30 and the second airbag 40, but also drains water into the borehole through the test pipe 20. The amount of water discharged from the test pipe 20 is the leakage rate, which is an important physical quantity characterizing the degree of fracture development and a core data point for determining the development height of the two zones. After the experiment, the pressure supply pipe stops supplying pressure to the equipment. The water flow inside the equipment will quickly move to the bottom under the action of gravity. As the pressure response end, the disc seal inside the inflation structure 50 will quickly move towards the inlet 58 under the action of pressure difference. Under this action, the first airbag 30 and the second airbag 40 will contract, facilitating the displacement of the overall double-end water-blocking structure. In addition, the top of the double-end water-blocking structure is also designed with a drill bit 80. When encountering borehole collapse, since there is no external pipeline, the sealing device can perform simple drilling work under the push of the drilling rig 60. With this design, the present invention can simplify the operation steps required for measurement and improve the overall testing efficiency.

[0093] Embodiment 2 of the present invention provides a measurement method using the aforementioned measuring device. The method includes: inserting the water supply pipe 10, test pipe 20, first airbag 30, second airbag 40, and inflation structure 50 of the measuring device for determining the development height of the two zones in an overburden goaf into the borehole to be tested; adjusting the water supply pressure of the water supply pipe 10; recording the current water supply flow rate as the initial flow rate when the water supply pressure of the water supply pipe 10 is stable; recording the current water supply flow rate as the termination flow rate after a preset interval; and obtaining the leakage amount of the borehole to be tested based on the difference between the initial flow rate and the termination flow rate. This facilitates the detection of water leakage in the goaf and improves measurement efficiency.

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

[0095] The first step is to connect the double-ended water-blocking structure, drilling rig 60, pressure and flow regulator, and 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-ended water-blocking structure. Observe whether the first airbag 30 and the second airbag 40 of the double-ended water-blocking structure can inflate normally. If the first airbag 30 and the second airbag 40 can inflate normally, close the pressure supply pipe and open the three-way valve 120 of the pressure and flow regulator 100 to release the water flow in the equipment, so that the first airbag 30 and the second airbag 40 contract to the normal contraction state.

[0097] The third step is to deliver the double-ended water-blocking structure to the predetermined position in the borehole using the drilling rig 60.

[0098] Step 4: Open the pressure supply pipe, adjust the three-way valve 120, and make the reading of the first pressure gauge 110 reach the predetermined requirement. Wait for a period of time, and 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 rate.

[0099] Step 5: Wait 3-5 minutes and record the flow meter 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 and 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 and 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 emptying the water inside the drill rod 70. After waiting for a period of time, the double-ended water-blocking structure is delivered to the next measurement area via 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 region based on the obtained data.

[0103] From the above description, it can be seen that the embodiments of the present invention achieve the following technical effects: The present invention improves the efficiency of airbag inflation and deflation by optimizing the equipment structure, effectively reducing operation steps and lowering the labor intensity of measurement personnel. Furthermore, by using an external drill bit, the problem of traditional equipment requiring disassembly and rework when encountering borehole collapse is solved. The improved two-belt height measurement device and method provided by the present invention, with water supplied by a single pipeline, abandons the independent pipeline water supply design of the airbag in traditional double-end water-blocking devices. It integrates the airbag water supply pipeline, using the drill rod as the test pipeline to supply water and pressure to the airbag. The structure and operation steps are simpler than those of traditional double-end water-blocking devices. The inflation structure design provided by the present invention relies entirely on the pressure difference between the airbag and pressurized water to achieve the purpose. The principle is reliable, does not use any power source or hazardous substances, has strong anti-interference capabilities, and is suitable for downhole measurement projects under various conditions. Furthermore, due to the advantages of the pipeline design, when the drill rod begins to drain water, the airbag can quickly respond with pressure, achieving rapid drainage and improving measurement efficiency. This invention's double-ended water plug uses both air and water as pressure control. Because air has a lower density than water, leakage is less likely during the movement of the disc-shaped seal. Furthermore, the space between the upper limiter and the trapezoidal limiter ensures sufficient redundancy for the airbag to prevent rupture, guaranteeing reliable airbag sealing. The drill bit design allows the device to continue operation without completely retracting the double-ended water plug in the event of borehole collapse, thus improving efficiency.

[0104] Furthermore, this testing device simplifies the measurement process, effectively reducing the workload of technicians. Moreover, by optimizing the water supply method, this technology simplifies the equipment structure, reduces the likelihood of problems, and provides a technical solution for addressing hole collapse and blockage issues without disassembling the equipment.

[0105] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0106] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0107] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

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

[0109] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0110] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A measuring device for measuring the height of the two zones in the goaf of the overburden, characterized in that, The utility model relates to a kind of inflatable test pipes, including: Water supply pipe (10), test pipe (20), first air bag (30) and second air bag (40), the first air bag (30) and the second air bag (40) are spaced on the water supply pipe (10) along the extension direction of the water supply pipe (10), the first air bag (30) and the second air bag (40) are all with expansion state and shrinkage state, the test pipe (20) is connected with the water supply pipe (10) and is set on the water supply pipe (10), the test pipe (20) is located between the first air bag (30) and the second air bag (40), the test pipe (20) is communicated with the water supply pipe (10), flow-through hole is provided on the peripheral wall of the test pipe (20); Inflatable structure (50) is arranged on the water supply pipe (10), the inflatable structure (50) is located on the side of the first air bag (30) away from the second air bag (40), the inflatable structure (50) includes inflatable shell (51), elastic reset piece (52) and sealing element (53), two ends of the elastic reset piece (52) are connected with the inner wall of the inflatable shell (51) and the sealing element (53) respectively, the sealing element (53) is adapted with the inner periphery of the inflatable shell (51) to separate the inflatable shell (51) into pressurized cavity and communication cavity, the first air bag (30) and the second air bag (40) are all communicated with the communication cavity, the inflatable structure (50) is provided with water inlet (58) communicated with the water supply pipe (10);The water supply pipe (10), the test pipe (20), the first air bag (30), the second air bag (40) and the inflatable structure (50) are all used to be installed in the borehole to be tested; Wherein, the sealing element (53) has initial position and pressurized position;When the sealing element (53) is in the initial position, the first air bag (30) and the second air bag (40) are all in the shrinkage state;When water in the water supply pipe (10) enters the pressurized cavity through the water inlet (58) to push the sealing element (53) from the initial position to the pressurized position, the first air bag (30) and the second air bag (40) are all in the expansion state; The inflatable structure (50) further comprises: a first limiting protrusion (54) arranged on the inner wall of the inflatable shell (51) and protruding from the inner wall of the inflatable shell (51); and a second limiting protrusion (55) arranged on the inner wall of the inflatable shell (51) and protruding from the inner wall of the inflatable shell (51), the first limiting protrusion (54) and the second limiting protrusion (55) are arranged at intervals along the extension direction of the inflatable shell (51), and the second limiting protrusion (55) is located on the side of the first limiting protrusion (54) away from the water inlet (58); wherein the sealing element (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 element (53) is in the first abutting position or on the side of the initial position close to the first abutting position, the sealing element (53) is in the pressurized position.

2. The measuring device for measuring the development height of two zones in the goaf of overburden rock according to claim 1, characterized in that, The inflatable structure (50) further comprises: a third limiting protrusion (56) arranged on the inner wall of the inflatable shell (51) and protruding from the inner wall of the inflatable shell (51), the third limiting protrusion (56) is arranged between the first limiting protrusion (54) and the second limiting protrusion (55), and the side of the third limiting protrusion (56) close to the first limiting protrusion (54) has a guide inclined surface (561); The sealing element (53) comprises a main body portion (531) and a connecting portion (532) connected to each other, the connecting portion (532) is arranged around the periphery of the main body portion (531), the connecting portion (532) is matched with 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 portion (531), the connecting portion (532) is arranged opposite to the guide inclined surface (561), and the sealing element (53) has a third abutting position abutting against the second limiting protrusion (55).

3. The measuring device for measuring the development height of two zones in the goaf of overburden rock according to claim 2, characterized in that, The third limiting protrusion (56) is in 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 a first limiting hole section and a 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 passage cross section of the first limiting hole section gradually increases, and the flow passage cross section of the second limiting hole section is constant; and / or, The initial position is located between the first abutting position and the third abutting position.

4. The measuring device for measuring the development height of two zones in the goaf of overburden rock according to claim 2, characterized in that, The third limiting protrusion (56) is in an annular structure; The first limiting convex part (54) is annular structure, and a side of the first limiting convex part (54) away from the inner wall of the inflatable shell (51) is arranged to protrude from a side of the third limiting convex part (56) away from the inner wall of the inflatable shell (51), and the side of the first limiting convex part (54) away from the inner wall of the inflatable shell (51) is arranged opposite to the main body part (531); and / or, The second limiting convex part (55) is annular structure, and a side of the second limiting convex part (55) away from the inner wall of the inflatable shell (51) is arranged to protrude from a side of the third limiting convex part (56) away from the inner wall of the inflatable shell (51), and the side of the second limiting convex part (55) away from the inner wall of the inflatable shell (51) is arranged opposite to the main body part (531).

5. The measuring device for measuring the development height of two zones in a goaf of overburden rock according to claim 1, characterized in that, The inflatable shell (51) is a ring-shaped shell arranged around the periphery of the water supply pipe (10), and the sealing member (53) is annular structure; and / or, 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 gas bag (30) and the second gas bag (40) to change from the contracted state to the inflated state; and / or, The inflatable structure (50) further comprises a filtering structure (57) arranged at the water inlet (58).

6. The measuring device for measuring the development height of two zones in the goaf of overburden rock according to claim 1, characterized in that, The inflatable structure (50) comprises a first filtering screen and a second filtering screen, and the first filtering screen is located on a side of the second filtering screen away from the pressurizing cavity; The mesh number of the first filtering screen is less than the mesh number of the second filtering screen; and / or, The first filtering screen and / or the second filtering screen are made of stainless steel or plastic.

7. The measuring device for measuring the development height of two zones in the goaf of overburden rock according to claim 1, characterized in that, The measuring device for measuring the development height of two zones in a goaf of overburden rock further comprises: A drilling machine (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 an end of the second gas bag (40) away from the first gas bag (30), and the drilling machine (60) is drivingly connected with the drill bit (80) through the drill rod (70).

8. The measuring device for measuring the development height of two zones in the goaf of overburden rock according to claim 1, characterized in that, The measuring device for measuring the development height of two zones in a goaf of overburden rock further comprises: A connecting pipeline (90), and an outlet of the connecting pipeline (90) is connected with the water supply pipe (10); A pressure flow regulator (100) is connected with the connecting pipeline (90), and comprises a first pressure gauge (110), a three-way valve (120), a second pressure gauge (130) and a flow meter (140) arranged in sequence along the direction from the inlet of the connecting pipeline (90) to the outlet of the connecting pipeline (90), the three-way valve (120) has a first communication port, a second communication port and a water outlet, the first communication port is selectively communicated with or disconnected from the second communication port to supply water to the water supply pipe (10); or the first communication port is selectively communicated with or disconnected from the water outlet to discharge water in the water supply pipe (10).

9. A method of measurement, characterized by, The measuring device for measuring the height of the two zones in the goaf of overburden rock according to any one of claims 1 to 8, the measuring method comprises: The water supply pipe, the test pipe, the first air bag, the second air bag and the inflation structure of the measuring device for measuring the height of the two zones in the goaf of overburden rock are sent into a drill hole to be tested; The water supply pressure of the water supply pipe is adjusted, and when the water supply pressure of the water supply pipe is stable, the current water supply flow is recorded as an initial flow; After a preset interval, the current water supply flow is recorded as a terminal flow, and the loss of the drill hole to be tested is obtained according to the difference between the initial flow and the terminal flow.

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