Overlying strata separation layer grouting sleeve monitoring device based on acoustic wave method

Abstract

The utility model provides an overlying strata separation layer grouting sleeve monitoring device based on a sound wave method, which comprises a grouting pipe inserted into a grouting drill hole; the grouting pipe is sleeved with the upper sliding sleeve in a sliding mode, and a first sonic sensor is arranged in the upper sliding sleeve; the grouting pipe is sleeved with the lower sliding sleeve in a sliding mode, and a second sonic sensor is arranged in the lower sliding sleeve; the upper sliding sleeve is connected with the lower sliding sleeve, the upper sliding sleeve is located on the lower sliding sleeve and spaced from the lower sliding sleeve, and the upper sliding sleeve and the lower sliding sleeve are located between the outer wall of the grouting pipe and the inner wall of the grouting drill hole; and the traction device is fixed on the ground above the grouting drill hole, and the upper sliding sleeve is connected with the traction device through a traction rope. When the traction device pulls the upper sliding sleeve and the lower sliding sleeve to move back and forth along the grouting pipe, the two sound wave sensors carry out sound wave positioning on the leakage position on the grouting pipe. Therefore, leakage positioning on the grouting pipe can be accurately monitored only through a small number of sensors, and the device cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of goaf grouting, in particular to a grouting casing monitoring device for overburden separation layer based on a sonic wave method. Background Art

[0002] The delamination grouting technology is to make fly ash and other solid waste into slurry on the ground and pump it into the delamination area of ​​the overlying rock strata formed by working face mining.

[0003] According to the survey, in the delamination grouting projects across the country, there are common problems such as casing deformation, misalignment, and disconnection during the grouting process. The slurry cannot be injected into the designated grouting layer according to the design requirements. The misalignment of the casing in the upper strata, especially the bedrock weathering zone, can easily lead to the slurry rising to the surface and slurry leakage, which not only reduces the use time of a single grouting hole, affects the quality of the project, and increases economic losses, but also increases the cost of delamination grouting filling, as well as certain safety and environmental risks. Therefore, it is necessary to monitor the grouting casing and determine the leakage location in time for repair and other work.

[0004] There are two types of pipeline leakage detection technologies: direct detection and indirect detection. With direct leak detection technology, the location of the leak can be accurately located by installing sensors and other technical means, such as manual inspections and mechanical scanning. However, this technology requires the placement of a large number of sensors and other signal processing facilities around the pipeline, resulting in extremely high operating costs. With indirect leak detection technology, a variety of physical parameters, such as magnetic flux, ultrasound, eddy currents, and pressure waves, can be used to accurately locate leaking pipelines, and the operating status of the pipeline can be monitored in real time, so as to promptly discover potential leaks and effectively improve the service life and safety of the pipeline. In addition, pipeline leakage diagnosis methods used at home and abroad also include thermal infrared imaging, magnetic flux leakage detection, and fiber optic detection, but these methods either cannot be continuously monitored, or although they have high sensitivity and accuracy, they require off-site measurement points and are expensive.

[0005] In the existing patent technology, for example, the Chinese patent CN109737317A disclosed on May 10, 2019, multiple infrasonic wave sensors are arranged on the fluid pipeline to collect infrasonic wave data in the fluid pipeline, so as to determine and locate the leak.

[0006] However, this type of patented technology requires a large number of acoustic wave sensors to be fixed on the pipeline to achieve a more accurate leak location effect, which is costly. Moreover, during the casing grouting process, if this monitoring method is used, the data lines of many sensors need to be accumulated in the borehole, which is difficult to handle and repair. Utility Model Content

[0007] The purpose of the utility model is to provide a monitoring device for grouting casing of overburden rock separation layer based on the acoustic wave method, which can accurately monitor the leakage location on the grouting pipe, reduce the number of sensors set, and reduce the cost of the device;

[0008] The utility model provides a monitoring device for overburden rock delamination grouting casing based on the acoustic wave method, comprising: a grouting pipe, the grouting pipe is inserted into a grouting borehole; an upper sliding sleeve, which is slidably sleeved on the outside of the grouting pipe, and a first acoustic wave sensor is arranged therein; a lower sliding sleeve, which is slidably sleeved on the outside of the grouting pipe, and a second acoustic wave sensor is arranged therein; the upper sliding sleeve is connected to the lower sliding sleeve, the upper sliding sleeve is located above the lower sliding sleeve with a spacing therebetween, the upper sliding sleeve and the lower sliding sleeve are located between the outer wall of the grouting pipe and the inner wall of the grouting borehole; a traction device, which is fixed to the ground above the grouting borehole, and the upper sliding sleeve and the traction device are connected by a traction rope.

[0009] Furthermore, an outer sleeve is provided in the grouting borehole, the grouting pipe is inserted into the outer sleeve, and the upper sliding sleeve and the lower sliding sleeve are located between the outer wall of the grouting pipe and the inner wall of the outer sleeve.

[0010] Furthermore, the upper sliding sleeve and the lower sliding sleeve are connected via a connecting plate.

[0011] Furthermore, the connecting plate includes a rigid portion and a flexible portion, and the rigid portion is connected to the upper sliding sleeve and the lower sliding sleeve respectively through the flexible portion.

[0012] Furthermore, the rigid part is hollow inside, and a controller is arranged therein, and the controller is electrically connected to the first acoustic wave sensor and the second acoustic wave sensor.

[0013] Furthermore, a signal line is integrated in the traction rope, the signal line is connected to the controller, and one end of the signal line located outside the grouting borehole is connected to a monitoring device.

[0014] Furthermore, the traction rope is a flexible rope.

[0015] Furthermore, it also includes a metering device for measuring the released length of the traction rope.

[0016] Furthermore, a counterweight is connected to the lower portion of the lower sliding sleeve.

[0017] Furthermore, it also includes a force measuring device for measuring the tension of the traction rope.

[0018] The technical solution of the utility model realizes movable measurement of two acoustic wave sensors outside the grouting pipe by adopting an upper sliding sleeve and a lower sliding sleeve; when the traction device pulls the upper sliding sleeve and the lower sliding sleeve to move back and forth along the grouting pipe, the two acoustic wave sensors perform acoustic wave positioning on the leakage position of the grouting pipe. Therefore, the device only needs a small number of sensors to accurately monitor the leakage location on the grouting pipe through mobile measurement, effectively reducing the cost of the device and reducing data lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the use state of the utility model;

[0021] Figure 2 For this utility model Figure 1 A magnified image of point A;

[0022] Figure 3 For this utility model Figure 2 The enlarged view of point B;

[0023] Figure 4 It is a schematic diagram of the upper sliding sleeve, the lower sliding sleeve and the connecting plate of the utility model;

[0024] Figure 5 For this utility model Figure 4 Sectional view at point C of FIG.

[0025] Figure 6 It is a schematic diagram of the outer sleeve, upper and lower sliding sleeves and grouting pipe of the utility model, wherein the outer sleeve is transparent so that the interior can be seen;

[0026] Description of reference numerals:

[0027] 1- grouting pipe; 2- upper sliding sleeve; 201- first acoustic wave sensor; 3- lower sliding sleeve; 301- second acoustic wave sensor; 4- connecting plate; 401- rigid part; 402- flexible part; 5- controller; 6- outer sleeve; 7- traction device; 8- traction rope; 801- signal line; 9- monitoring equipment; 10- counterweight; 11- metering device; 12- force measuring device; 13- coal seam; 14- key layer; 15- ground surface; 16- grouting borehole. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Example 1

[0032] like Figure 1-Figure 6 As shown, the utility model provides a monitoring device for overburden rock delamination grouting casing based on the acoustic wave method, comprising: a grouting pipe 1, the grouting pipe 1 is inserted into a grouting borehole 16; an upper sliding sleeve 2, which is slidably sleeved on the outside of the grouting pipe 1, and a first acoustic wave sensor 201 is arranged therein; a lower sliding sleeve 3, which is slidably sleeved on the outside of the grouting pipe 1, and a second acoustic wave sensor 301 is arranged therein; the upper sliding sleeve 2 is connected to the lower sliding sleeve 3, the upper sliding sleeve 2 is located above the lower sliding sleeve 3 and there is a spacing, the upper sliding sleeve 2 and the lower sliding sleeve 3 are located between the outer wall of the grouting pipe 1 and the inner wall of the grouting borehole 16; a traction device 7, fixed to the ground above the grouting borehole 16, and the upper sliding sleeve 2 and the traction device 7 are connected by a traction rope 8.

[0033] Specifically, after the coal seam 13 is mined, the overburden key layer 14 loses its lower support, breaks and sinks under the heavy pressure of the stratum, and then causes the ground surface 15 to sink; and the overburden delamination grouting technology is to find the key layer 14 that controls the sinking of the ground surface 15, and use ground drilling to inject grout into the cracks below the key layer 14, and through the pressure-down and drag-up effect, the key layer 14 is re-supported, thereby effectively controlling the movement of the rock stratum and the ground surface 15, and protecting the aquifer and buildings. The overburden delamination grouting technology belongs to the existing technical content, and its implementation method and principle will not be repeated. In this embodiment, the grouting borehole 16 is drilled below the key layer 14, and the grouting pipe 1 is inserted into the grouting borehole 16 to inject grout below the key layer 14.

[0034] When the grouting position has a certain depth, it may be difficult to reach by relying on a single grouting pipe 1, and a plurality of grouting pipes 1 can be connected end to end to form a longer grouting pipe 1. At this time, at the connection position, leakage may be caused due to reasons such as misalignment.

[0035] The upper sliding sleeve 2 and the lower sliding sleeve 3 are annular structures, which are sleeved on the outer wall of the grouting pipe 1, and there is a certain gap between them to facilitate smoother movement. The upper sliding sleeve 2 and the lower sliding sleeve 3 are hollow inside, forming an annular hollow structure. A single acoustic wave sensor can be set in the upper sliding sleeve 2 and the lower sliding sleeve 3, or multiple acoustic wave sensors can be set in a circular array. Of course, when the latter surrounding setting method is adopted, the monitoring capability is more accurate.

[0036] In order to facilitate the acoustic wave sensor to obtain the sound waves at the leakage position, holes can be opened at the positions corresponding to the acoustic wave sensors on the upper sleeve 2 and the lower sleeve 3, and the probes of the acoustic wave sensors are placed in the holes (sealed in the gap), so as to facilitate the acoustic wave sensor to capture the sound waves at the leakage position. Although this method may cause the probe of the acoustic wave sensor to contact the leaked slurry, the slurry will not solidify due to the reciprocating motion of the upper sleeve 2 and the lower sleeve 3. As long as the sleeve surface is cleaned regularly, it will have little effect on the service life of the acoustic wave sensor.

[0037] The traction device 7 can be selected to be similar to a winch device, on which a traction rope 8 is wound, and the upper sliding sleeve 2 and the lower sliding sleeve 3 are controlled to rise along the grouting pipe 1 by retracting the traction rope 8, and the upper sliding sleeve 2 and the lower sliding sleeve 3 are controlled to fall along the grouting pipe 1 by releasing the traction rope 8 and their own weight. Thus, reciprocating up and down movement can be achieved.

[0038] During the process of the upper sliding sleeve 2 and the lower sliding sleeve 3 moving back and forth up and down along the grouting pipe 1, when there is leakage in the area of ​​the grouting pipe 1 passed through, the first acoustic wave sensor 201 and the second acoustic wave sensor 301 jointly capture the acoustic wave signal of the leakage position, and then jointly determine the leakage position by comparing the two acoustic wave signals.

[0039] The technical principle of monitoring leakage by sound waves is the prior art in this field, and there are many applications in the prior art, so it will not be repeated. Mainly, when a pipeline leaks, a pressure drop will occur at the leaking position, generating a negative back pressure, and the sound waves caused by the back pressure will propagate to the upstream and downstream of the pipeline respectively, and will be detected by the first sound wave sensor 201 above the leaking position and the second sound wave sensor 301 below, and the leaking position can be estimated by determining the time lag between the two leaking signals. And because in this embodiment, the first sound wave sensor 201 and the second sound wave sensor 301 are close to the leaking position, the pump, gas / liquid compressor or other fluid flow control equipment has little effect on the collected leakage sound wave signal (because they are far away from the first sound wave sensor 201 and the second sound wave sensor 301), therefore, the device also has the effect of reducing the interference of other equipment on the leakage signal detection, and further improves the monitoring accuracy.

[0040] Example 2

[0041] An outer sleeve 6 is arranged in the grouting borehole 16 , the grouting pipe 1 is inserted into the outer sleeve 6 , and the upper sliding sleeve 2 and the lower sliding sleeve 3 are located between the outer wall of the grouting pipe 1 and the inner wall of the outer sleeve 6 .

[0042] Specifically, the outer sleeve 6 directly contacts the inner wall of the borehole for protection, and is used to protect the grouting pipe 1, the upper sliding sleeve 2 and the lower sliding sleeve 3. The outer sleeve 6 can be left in the borehole or taken out for reuse after the grouting is completed.

[0043] Example 3

[0044] The upper sleeve 2 is connected to the lower sleeve 3 via a connecting plate 4. The connecting plate 4 includes a rigid portion 401 and a flexible portion 402, and the rigid portion 401 is connected to the upper sleeve 2 and the lower sleeve 3 respectively via the flexible portion 402. The rigid portion 401 is hollow inside, and a controller 5 is arranged therein, and the controller 5 is electrically connected to the first acoustic wave sensor 201 and the second acoustic wave sensor 301. A signal line 801 is integrated in the traction rope 8, and the signal line 801 is connected to the controller 5. One end of the signal line 801 located outside the grouting borehole 16 is connected to the monitoring device 9.

[0045] Specifically, the connection plate 4 partially connects the upper sleeve 2 and the lower sleeve 3. The connection plate 4 stores the controller 5 through the rigid part 401. The controller 5 has an information receiving and processing module. The connecting wires on the first acoustic wave sensor 201 and the second acoustic wave sensor 301 pass through the connection plate 4 and the partitions of the upper sleeve 2 and the lower sleeve 3, and are connected to the information receiving module of the controller 5 to receive two groups of acoustic wave signals, and the two groups of signals are processed by the processing module, and then the signals are transmitted to the monitoring device 9 on the ground through the signal line 801 integrated in the traction rope 8, so that the monitoring device 9 can process the data and judge whether it passes through the leakage position.

[0046] The connecting plate 4 can also achieve bending action through the flexible portion 402, because during the drilling process or the connection process of the grouting pipe 1, a bending section may occur. Although the bending amplitude is small, if the connecting plate 4 remains in a rigid state, it may also cause the upper sliding sleeve 2 and the lower sliding sleeve 3 to be unable to move smoothly. When the flexible portion 402 is used, when encountering such a bending area, the connecting plate 4 allows the upper sliding sleeve 2 and the lower sliding sleeve 3 to no longer remain in a coaxial state, so as to move smoothly.

[0047] Example 4

[0048] The traction rope 8 is a flexible rope. A metering device 11 is also included for measuring the length of the traction rope 8. A counterweight 10 is connected to the lower part of the lower sliding sleeve 3. A force measuring device 12 is also included for measuring the tension of the traction rope 8.

[0049] Specifically, the traction rope 8 can be used in a bent state as in the third embodiment by adopting a flexible rope.

[0050] The counterweight 10 is used to increase the deadweight of the overall structure composed of the upper sliding sleeve 2, the lower sliding sleeve 3 and the connecting plate 4, so that it can fall along the grouting pipe 1 under the action of gravity. In addition, when there is a leak in the grouting pipe 1, the slurry emitted from the leaking position may hinder the lower sliding sleeve 3 from continuing to fall. The ability of the lower sliding sleeve 3 to pass the leaking position can be improved by increasing the weight of the counterweight 10. The counterweight 10 is specifically, for example, a lead block.

[0051] When there is a leak in the grouting pipe 1, it may accumulate between the outer sleeve 6 and the grouting pipe 1. Due to the buoyancy of the slurry, the lower sleeve 3 may be hindered from continuing to descend. The tension of the traction rope 8 is also reduced due to the buoyancy of the slurry on the lower sleeve 3. At this time, this tension reduction state is detected by the force measuring device, which is connected to the monitoring device 9. The monitoring device 9 can determine that the lower sleeve 3 is blocked from descending, and then determine that there may be a leak. The force measuring device 12 can specifically be a dynamometer of a suspended pulley. The traction rope 8 is wound around the pulley. As the traction rope 8 is released, the weight of the traction rope 8 and the two sleeves measured by the dynamometer will continue to increase; but when the weight measured by the dynamometer pauses at a certain moment, it proves that the weight of the two sleeves is affected by the buoyancy of the slurry, and the tension of the traction rope 8 is also reduced.

[0052] When the upper sleeve 2 and the lower sleeve 3 determine the leakage position of the grouting pipe 1, or when the upper sleeve 2 and the lower sleeve 3 cannot continue to descend due to the leakage of the grouting pipe 1, the length of the traction rope 8 can be obtained through the metering device 11, and the position of the upper sleeve 2 and the lower sleeve 3 at this time can be determined, and then the leakage position or the slurry rising position can be determined. The metering device 11 is specifically, for example, a counter set on the winch traction device, and the released length of the traction rope 8 can be calculated by counting the number of released revolutions.

[0053] Working mode and principle of this utility model:

[0054] The upper sliding sleeve 2 and the lower sliding sleeve 3 are used to realize the movable measurement of the two acoustic wave sensors outside the grouting pipe 1; when the traction device 7 pulls the upper sliding sleeve 2 and the lower sliding sleeve 3 to move back and forth along the grouting pipe 1, the two acoustic wave sensors capture the acoustic wave data of the leakage position on the grouting pipe 1, and the controller 5 in the connecting plate 4 processes and transmits the acoustic wave data to the monitoring device 9, so that the monitoring device 9 located on the ground can judge whether the grouting pipe 1 has a leak, and determine the position of the upper sliding sleeve 2 and the lower sliding sleeve 3 by the length of the traction rope 8, and then determine the position of the leakage in the grouting pipe 1. Therefore, the device only needs a small number of sensors, and can accurately monitor the leakage location on the grouting pipe 1 through mobile measurement, effectively reducing the cost of the device and reducing data lines.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A grouting casing monitoring device for overburden separation layer based on acoustic wave method, characterized in that: include: A grouting pipe, the grouting pipe is inserted into the grouting borehole; An upper sliding sleeve is slidably sleeved on the outside of the grouting pipe and has a first acoustic wave sensor disposed therein; A lower sliding sleeve is slidably sleeved on the outside of the grouting pipe and has a second acoustic wave sensor arranged therein; The upper sliding sleeve is connected to the lower sliding sleeve, the upper sliding sleeve is located above the lower sliding sleeve with a spacing, and the upper sliding sleeve and the lower sliding sleeve are located between the outer wall of the grouting pipe and the inner wall of the grouting borehole; The traction device is fixed on the ground above the grouting borehole, and the upper sliding sleeve and the traction device are connected by a traction rope.

2. The overburden rock separation layer grouting casing monitoring device based on the acoustic wave method according to claim 1 is characterized in that: An outer sleeve is arranged in the grouting borehole, the grouting pipe is inserted into the outer sleeve, and the upper sliding sleeve and the lower sliding sleeve are located between the outer wall of the grouting pipe and the inner wall of the outer sleeve.

3. The overburden rock separation layer grouting casing monitoring device based on the acoustic wave method according to claim 1 is characterized in that: The upper sliding sleeve and the lower sliding sleeve are connected via a connecting plate.

4. The overburden rock separation layer grouting casing monitoring device based on the acoustic wave method according to claim 3 is characterized in that: The connecting plate comprises a rigid portion and a flexible portion, and the rigid portion is connected to the upper sliding sleeve and the lower sliding sleeve respectively through the flexible portion.

5. The overburden rock separation layer grouting casing monitoring device based on the acoustic wave method according to claim 4 is characterized in that: The rigid part is hollow inside and is provided with a controller therein. The controller is electrically connected to the first acoustic wave sensor and the second acoustic wave sensor.

6. The overburden rock separation layer grouting casing monitoring device based on the acoustic wave method according to claim 5 is characterized in that: A signal line is integrated in the traction rope, the signal line is connected to the controller, and one end of the signal line located outside the grouting borehole is connected to the monitoring device.

7. The overburden rock separation layer grouting casing monitoring device based on the acoustic wave method according to claim 4 is characterized in that: The traction rope is a flexible rope.

8. The overburden rock separation layer grouting casing monitoring device based on the acoustic wave method according to claim 7 is characterized in that: It also includes a metering device for measuring the released length of the traction rope.

9. The overburden rock separation layer grouting casing monitoring device based on the acoustic wave method according to claim 7 is characterized in that: A counterweight is connected to the lower portion of the lower sliding sleeve.

10. The overburden separation layer grouting casing monitoring device based on the acoustic wave method according to claim 8 is characterized in that: It also includes a force measuring device for measuring the tension of the traction rope.

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