Grouting monitoring device for goaf grouting and goaf grouting method

Abstract

The present invention provides a grouting monitoring device for grouting in goaf and a grouting method for goaf, wherein the grouting monitoring device for grouting in goaf comprises a grouting outer tube, a detection component, a slurry stopper, an airbag component, a one-way valve, an exhaust valve and a pressure sensor; the presence of the first airbag enables the flow area of ​​the tube body to vary with the pressure in the tube body, and when a certain section in the grouting tube is blocked, the first airbag is contracted, thereby increasing the flow area of ​​the tube body and unblocking the tube body; the tube body and the airbag component are pulled out as a whole, and the base and the detection mark rod are left in the grouting hole, solidified into one with the filling body in the goaf, and a monitoring alarm component is provided on the detection substrate to monitor the relative movement distance of the detection mark rod and the detection substrate, and then monitor the settlement distance of the filling body in the goaf, so as to monitor the effect after grouting in real time; the grouting method for goaf adopts the above-mentioned grouting monitoring device for grouting in goaf.

Description

Technical Field

[0001] The invention belongs to the technical field of grouting equipment, and in particular relates to a grouting monitoring device for grouting in a goaf area and a goaf area grouting method. Background Art

[0002] When underground ore is mined, goaf areas are formed. The surrounding rock loses its stability, shifting, cracking, and even collapsing. This causes the overlying rock strata to sink and bend, leading to surface subsidence. This deformation continues over a long period of time. If left untreated, buildings, water conservancy projects, and transportation infrastructure will be deformed or even destroyed. With the continuous development of the economy and society, the impact of goaf disasters on engineering construction has become more prominent, and how to effectively control surface subsidence has become a major issue. Currently, filling goaf areas with cement fly ash slurry is one of the effective methods for managing goaf disasters.

[0003] However, during the grouting process, the grouting pipe may occasionally be blocked, affecting the construction progress, and there is usually no effect monitoring device, making it impossible to effectively monitor the effect after grouting. Summary of the Invention

[0004] The embodiment of the present invention provides a grouting monitoring device for goaf grouting and a goaf grouting method, which aims to solve the technical problems in the prior art of occasional blockage of grouting pipes and inability to effectively monitor the effects of grouting when grouting is performed using grouting pipes.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention provides a grouting monitoring device for grouting in a goaf, comprising:

[0007] The grouting outer tube comprises a tube body and a base, wherein the top end of the tube body is closed, a plurality of slurry outlet holes are opened on the side wall, and a grouting port is opened on the side surface of the top end; a first connecting component is provided on the base, the connecting component is clamped with the bottom end of the outer tube, and the connecting component has the freedom to slide relative to the base in the radial direction of the base;

[0008] The detection assembly includes a detection rod, a detection substrate, and a monitoring and alarm assembly. The detection rod is disposed in the tube body, one end of which is connected to the base, and the other end protrudes from the grouting hole; the detection substrate cover is disposed on the grouting hole; the monitoring and alarm assembly is disposed on the detection substrate and connected to the detection rod, and is used to monitor the vertical settlement distance of the detection rod relative to the detection substrate and to issue an alarm when a preset value is reached;

[0009] A slurry stopper, sleeved on the outside of the pipe body;

[0010] An airbag assembly includes a first airbag and a second connecting assembly, wherein the first airbag is arranged inside the grouting outer tube, a first joint is provided at the top end, and the first joint protrudes from the top end of the tube body, and an avoidance hole is opened at the bottom end, the detection mark rod is passed through the avoidance hole, the bottom end of the first airbag is connected to the second connecting assembly, the second connecting assembly is connected to the base, and the first joint is suitable for communicating with the air pump;

[0011] a one-way valve connected to the first connector;

[0012] an exhaust valve connected to and in communication with the first airbag and protruding from the tube body;

[0013] a pressure sensor connected to the first airbag and protruding from the tube body;

[0014] In which, the second connecting component is suitable for driving the first connecting component to slide outward after the first airbag fills the tube body, disconnecting the tube body and the base, and disconnecting the second connecting component from the base after the gas in the first airbag is discharged; the detection substrate is suitable for covering the grouting hole after the tube body and the airbag assembly are pulled out.

[0015] In combination with the first aspect, in a possible implementation of the grouting monitoring device for grouting in goaf provided by the present invention, a plurality of protrusions are provided on the air bag, and the plurality of protrusions correspond one-to-one to the plurality of slurry outlet holes, which are suitable for blocking the slurry outlet holes after the air bag expands and fills the grouting outer tube.

[0016] In combination with the first aspect, in a possible implementation of the grouting monitoring device for grouting in goaf provided by the present invention, the second connecting component includes a second airbag and a second joint, a accommodating cavity is provided in the base, and a through hole connected to the accommodating cavity is provided on the top, and the second joint is arranged in the through hole, one end of which is connected and connected to the first airbag, and the other end is connected and connected to the second airbag.

[0017] In combination with the first aspect, in a possible implementation of the grouting monitoring device for grouting in goafs provided by the present invention, the second connecting assembly also includes a plurality of clamping plates, which are arranged around the second joint and are arranged in the accommodating cavity, with one end rotatably connected to the bottom end of the second joint; during the inflation of the second airbag, the clamping plate is gradually lifted up and flipped outward until it abuts against the top of the accommodating cavity. At this time, the plurality of clamping plates are unfolded, so that the bottom of the second joint is stuck in the accommodating cavity, preventing the second airbag from being pulled out of the accommodating cavity, and making the second airbag and the second joint more firmly connected to the seat body.

[0018] In combination with the first aspect, in a possible implementation of the grouting monitoring device for grouting in goafs provided by the present invention, the first connecting assembly includes a plurality of T-shaped blocks and a plurality of sliders, a plurality of slide grooves are opened circumferentially on the base, and the plurality of slide grooves are connected to the accommodating cavity, and the plurality of sliders are respectively slidably matched with the plurality of slide grooves, one end of the plurality of sliders is respectively connected to the T-shaped block and the other end is placed in the accommodating cavity, and has the freedom to slide along the slide groove; a plurality of T-shaped grooves are opened circumferentially on the outer side of the bottom of the tube body, and one end of the plurality of T-shaped blocks is respectively connected to the plurality of sliders, and the other end is respectively clamped in the plurality of T-shaped grooves.

[0019] In combination with the first aspect, in a possible implementation of the grouting monitoring device for grouting in goaf provided by the present invention, the slider is in a T-shaped structure, the small diameter portion of the slider is arranged in the slide groove and slides with the slide groove, and the large diameter portion of the slider is arranged in the accommodating cavity and is suitable for abutting against the second airbag.

[0020] In combination with the first aspect, in a possible implementation of the grouting monitoring device for grouting in goaf provided by the present invention, the first connecting assembly also includes a plurality of springs, and the plurality of springs are respectively mounted on the small diameter portions of the plurality of sliders, with one end connected to the inner wall of the accommodating cavity and the other end connected to the large diameter portion of the slider.

[0021] In combination with the first aspect, in a possible implementation of the grouting monitoring device for grouting in goaf provided by the present invention, the monitoring alarm component includes two conductive sliders, a connecting rope and an alarm element. The two conductive sliders are respectively arranged on both sides of the detection mark rod and are slidingly connected to the detection substrate. The two ends of the connecting rope are respectively connected to the two conductive sliders and to the detection mark rod. The alarm element is respectively electrically connected to the two conductive sliders for issuing an alarm when the two conductive sliders are in contact.

[0022] In a second aspect, the present invention further provides a goaf grouting method, wherein the goaf grouting monitoring device is used for grouting, and the operation steps are as follows:

[0023] A. Use drilling tools to drill grouting holes leading to the goaf above the required goaf;

[0024] B. Inserting a grouting pipe for grouting the well into the grouting hole, connecting the grouting port to the grouting pump, and connecting the first joint to the air pump;

[0025] C. Turn on the air pump to inflate the first airbag until the pressure sensor detects that the pressure in the first airbag reaches a first preset pressure. Then turn off the air pump. During this process, the first airbag expands, but the sidewall of the first airbag is separated from the inner wall of the tube by a preset distance to maintain a suitable flow area. The first preset pressure and preset distance are both determined after a limited number of tests.

[0026] D. Start the grouting pump and start grouting;

[0027] E. After grouting is completed, the air pump is turned on to continue to inflate the first airbag until a second preset pressure is reached, and the connection between the first connector and the air pump is disconnected. During this process, the first airbag fills the tube body, and the second drive assembly drives the first connecting assembly to slide outward, disconnecting the tube body from the base, separating the tube body from the base, and withdrawing the tube body. During the process of withdrawing the tube body, the first airbag injects grout to replace the tube body, thereby blocking the grouting hole;

[0028] F. After the slurry solidifies, the exhaust valve is opened to exhaust the gas in the first airbag, and the connection between the second connecting assembly and the base is disconnected; the airbag assembly is then withdrawn, and the base and the detection mark rod connected to the base are left in the grouting hole, and grouting is continued into the grouting hole to compensate for the loss of slurry caused by withdrawing the tube body and the airbag assembly;

[0029] G. After the slurry in the grouting hole solidifies, the detection substrate cover is placed on the grouting hole, and the monitoring alarm component is installed to monitor the settlement distance of the goaf after grouting, and issue an alarm when the preset distance is exceeded.

[0030] In conjunction with the second aspect, in a possible implementation of the goaf grouting method provided by the present invention, step D further includes:

[0031] D1. During the grouting process, if the internal pressure of the first airbag continues to increase and remains for a certain period of time, it means that the tube body is blocked and cannot be unblocked by the contraction of the first airbag alone. At this time, it is necessary to open the exhaust valve to release the gas in the first airbag to further increase the flow area and solve the blockage problem. After that, close the exhaust valve and refill the first airbag with gas until the first preset pressure is reached in the first airbag.

[0032] The beneficial effects of the grouting monitoring device for grouting in goaf provided by the present invention are as follows: compared with the prior art, the grouting monitoring device for grouting in goaf provided by the present invention is provided with a first air bag in the pipe body, and a certain amount of gas is first filled into the first air bag before grouting, and then the grouting pump is connected to the grouting port to start grouting. On the one hand, the presence of the first air bag allows the flow area of ​​the pipe body to change with the pressure in the pipe body. When a certain section in the grouting pipe is blocked, the pressure in the pipe body increases, squeezing the first air bag to shrink the first air bag, thereby increasing the flow area of ​​the pipe body, and the pipe body is unblocked, thereby effectively alleviating the problem of easy blockage of the grouting pipe; in addition, during grouting, After completion, continue to inflate the first airbag to expand it, fill the tube body, and squeeze out the slurry in the tube body to facilitate pulling out the tube body. At the same time, disconnect the connection between the tube body and the base, and the connection between the second connecting component and the base, and then pull out the tube body and the airbag assembly as a whole, leaving the base and the detection mark rod in the grouting hole, solidifying them into one with the filling body in the goaf, and covering the grouting hole with a detection substrate, and setting a monitoring alarm component with the detection mark rod and the detection substrate on the detection substrate to monitor the relative movement distance of the detection mark rod and the detection substrate, and then monitor the settlement distance of the filling body in the goaf, so as to monitor the effect after grouting in real time.

[0033] The beneficial effect of the grouting method for grouting in goaf provided by the present invention is: compared with the prior art, the grouting method for grouting in goaf provided by the present invention, using the above-mentioned grouting monitoring device for grouting in goaf, can effectively reduce the situation of pipe blockage. At the same time, the settlement distance of the filling body in the goaf can be monitored by the monitoring alarm component to monitor the effect after grouting in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the main structure of the grouting monitoring device for goaf grouting provided by an embodiment of the present invention when the detection substrate and the monitoring alarm component are not installed during grouting;

[0035] Figure 2 For the Figure 1 Cross-sectional structural diagram along line AA;

[0036] Figure 3 A schematic diagram of the main structure of the grouting monitoring device for goaf grouting provided by an embodiment of the present invention after grouting is completed, the pipe body and the airbag assembly are pulled out, and the detection substrate and the monitoring alarm assembly are installed;

[0037] Figure 4 A schematic diagram of the top view of the grouting monitoring device for goaf grouting provided by an embodiment of the present invention after grouting is completed, the pipe body and the airbag assembly are pulled out, and the detection substrate and the monitoring alarm assembly are installed;

[0038] Figure 5 for Figure 1A magnified view of part A in FIG;

[0039] Figure 6 for Figure 2 A magnified view of part B in FIG;

[0040] Figure 7 for Figure 2 Enlarged view of part C in ;

[0041] Figure 8 for Figure 2 Enlarged view of part D in FIG;

[0042] Description of reference numerals:

[0043] 11. Pipe body; 111. Slurry outlet; 112. Grouting port; 113. First joint;

[0044] 12. Base; 13. T-shaped block; 14. Slider; 15. Spring;

[0045] 21. First airbag; 211. Protrusion; 22. Second airbag; 23. Second connector;

[0046] 24. Card plate; 31. One-way valve; 32. Exhaust valve; 33. Pressure sensor;

[0047] 41. Detection pole; 42. Detection substrate; 43. Conductive slider; 44. Connecting rope;

[0048] 45. Alarm element; 50. Stop plug. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0053] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently 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 may also be positioned in other different ways, and the spatially relative descriptions used herein are interpreted accordingly.

[0055] 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.

[0056] Please also refer to Figures 1 to 8 Now, the grouting monitoring device for goaf grouting and the goaf grouting method provided by the present invention are described.

[0057] like Figures 1 to 8As shown, the grouting monitoring device for grouting in the goaf includes a grouting outer tube, a detection component, a slurry stopper 50, an airbag component, a one-way valve 31, an exhaust valve 32 and a pressure sensor 33; the grouting outer tube includes a tube body 11 and a base 12, the top of the tube body 11 is closed, a plurality of slurry holes 111 are opened on the side wall, a grouting port 112 is opened on the top side, and a first connecting component is provided on the base 12, the connecting component is clamped with the bottom end of the outer tube, and the connecting component has the freedom to slide relative to the base 12 in the radial direction of the base 12; the detection component includes a detection mark rod 41, a detection substrate 42 and a monitoring alarm component, the detection mark rod 41 is arranged in the tube body 11, one end is connected to the base 12, and the other end protrudes from the grouting hole; the detection substrate 42 is covered on the grouting hole; the monitoring alarm component is provided on the detection substrate 42 and is connected to the detection mark rod 41. The rod 41 is connected to monitor the vertical settlement distance of the detection mark rod 41 relative to the detection substrate 42, and to issue an alarm after reaching a preset value; the slurry stopper 50 is sleeved on the outside of the tube body 11; the airbag assembly includes a first airbag 21 and a second connecting assembly, the first airbag 21 is arranged inside the grouting outer tube, and a first joint 113 is provided at the top, and the first joint 113 protrudes from the top of the tube body 11, and a avoidance hole is opened at the bottom, and the detection mark rod 41 is passed through the avoidance hole, the bottom end of the first airbag 21 is connected to the second connecting assembly, the second connecting assembly is connected to the base 12, and the first joint 113 is suitable for connecting to the air pump; the one-way valve 31 is connected to the first joint 113; the exhaust valve 32 is connected and communicated with the first airbag 21, and protrudes from the tube body 11; the pressure sensor 33 is connected to the first airbag 21 and protrudes from the tube body 11.

[0058] Among them, the second connecting component is suitable for driving the first connecting component to slide outward after the first airbag 21 fills the tube body 11, disconnecting the connection between the tube body 11 and the base 12, and disconnecting the second connecting component from the base 12 after the gas in the first airbag 21 is discharged; the detection substrate 42 is suitable for covering the grouting hole after the tube body 11 and the airbag assembly are pulled out.

[0059] The beneficial effects of the grouting monitoring device for grouting in goaf provided by the embodiment of the present invention are as follows: compared with the prior art, the grouting monitoring device for grouting in goaf provided by the embodiment of the present invention provides a first air bag 21 in the pipe body 11, and before grouting, a certain amount of gas is first filled into the first air bag 21, and then the grouting pump is connected to the grouting port 112 to start grouting. On the one hand, the presence of the first air bag 21 allows the flow area of ​​the pipe body 11 to change with the pressure in the pipe body 11. When a certain section in the grouting pipe is blocked, the pressure in the pipe body 11 increases, squeezing the first air bag 21, causing the first air bag 21 to contract, thereby increasing the flow area of ​​the pipe body 11, and the pipe body 11 is unblocked, thereby effectively alleviating the problem of easy blockage of the grouting pipe; in addition, After the grouting is completed, continue to inflate the first airbag 21 to expand it, fill the tube body 11, and squeeze out the slurry in the tube body 11 to facilitate the pulling out of the tube body 11. At the same time, disconnect the connection between the tube body 11 and the base 12, and the connection between the second connecting component and the base 12, and then pull out the tube body 11 and the airbag component as a whole, leaving the base 12 and the detection mark 41 in the grouting hole, solidifying into one with the filling body in the goaf, and covering the grouting hole with a detection substrate 42, and setting a monitoring alarm component with the detection mark 41 and the detection substrate 42 on the detection substrate 42 to monitor the relative movement distance of the detection mark 41 and the detection substrate 42, and then monitor the settlement distance of the filling body in the goaf, so as to monitor the effect after grouting in real time.

[0060] like Figure 2 and Figure 7 As shown, in a specific embodiment, a plurality of protrusions 211 are provided on the airbag, and the plurality of protrusions 211 correspond one-to-one to the plurality of slurry outlet holes 111, which are suitable for blocking the slurry outlet holes 111 after the airbag is expanded to fill the grouting outer tube, and further pushing out the slurry in the slurry outlet holes 111, so as to avoid the slurry remaining in the slurry outlet holes 111 from solidifying with the external slurry, thereby increasing the difficulty of pulling out the tube; the second connecting component is an adhesive layer, which is used to bond the bottom of the first airbag 21 to the bottom of the grouting outer tube.

[0061] like Figure 2 and Figure 6 As shown, in a specific embodiment, the second connecting component includes a second airbag 22 and a second joint 23. A accommodating cavity is opened in the base 12, and a through hole connected to the accommodating cavity is opened on the top. The second joint 23 is arranged in the through hole, one end of which is connected and connected to the first airbag 21, and the other end of which is connected and connected to the second airbag 22.

[0062] like Figure 2 and Figure 6 As shown, in a specific embodiment, the second connecting assembly further includes a plurality of clamping plates 24 , which are arranged around the second joint 23 and disposed in the accommodating cavity, with one end rotatably connected to the bottom end of the second joint 23 .

[0063] like Figure 5 and Figure 6 As shown, in a specific embodiment, the first connecting component includes a plurality of T-shaped blocks 13 and a plurality of sliders 14, the base 12 is circumferentially provided with a plurality of slide grooves, the plurality of slide grooves are connected to the accommodating cavity, the plurality of sliders 14 are respectively slidably matched with the plurality of slide grooves, one end of the plurality of sliders 14 is respectively connected to the T-shaped block 13 and the other end is placed in the accommodating cavity, and has the freedom to slide along the slide groove; a plurality of T-shaped slots are circumferentially provided on the outer side of the bottom of the tube body 11, one end of the plurality of T-shaped blocks 13 is respectively connected to the plurality of sliders 14, and the other end is respectively clamped in the plurality of T-shaped slots.

[0064] like Figure 6 As shown, in a specific embodiment, the slider 14 has a T-shaped structure, the small diameter portion of the slider 14 is arranged in the slide groove, slidingly cooperates with the slide groove, the outer end is connected to the T-shaped block 13, and the large diameter portion of the slider 14 is arranged in the accommodating cavity and is suitable for abutting against the second airbag 22.

[0065] like Figure 6 As shown, in a specific embodiment, the first connecting assembly also includes multiple springs 15, which are respectively mounted on the small diameter portions of the multiple sliders 14, with one end connected to the inner wall of the accommodating cavity and the other end connected to the large diameter portion of the slider 14.

[0066] It should be noted that the spring 15 is always in a compressed state, exerting an inward force on the slider 14, so that the T-shaped block 13 connecting the surface and the slider 14 slides out of the T-shaped groove, making the connection between the tube body 11 and the base 12 more stable.

[0067] After grouting is completed, continue to inflate the first airbag 21 so that the first airbag 21 and the second airbag 22 expand synchronously. The first airbag 21 fills the tube body 11, and the second airbag 22 pushes the slider 14 outward, causing the T-shaped block 13 to slide out of the T-shaped groove, disconnecting the tube body 11 from the base 12.

[0068] like Figure 3 and Figure 4 As shown, in a specific embodiment, the monitoring alarm component includes two conductive sliders 43, a connecting rope 44 and an alarm element 45. The two conductive sliders 43 are respectively arranged on both sides of the detection mark 41 and are slidably connected to the detection substrate 42. The two ends of the connecting rope 44 are respectively connected to the two conductive sliders 43 and connected to the detection mark 41. The alarm element 45 is respectively electrically connected to the two conductive sliders 43 and is used to issue an alarm when the two conductive sliders 43 are in contact.

[0069] It should be noted that the conductive slider 43 is insulated from the detection substrate 42 ; the alarm element is a buzzer or a computer or other element that can emit sound or image information with a prompt effect.

[0070] Based on the same inventive concept, the present invention further provides a goaf grouting method, which uses the above-mentioned goaf grouting monitoring device for grouting to perform grouting, and the operating steps are as follows:

[0071] A. Use drilling tools to drill grouting holes leading to the goaf above the required goaf;

[0072] B. Insert the grouting pipe for grouting the well into the grouting hole, connect the grouting port 112 to the grouting pump, and connect the first joint to the air pump;

[0073] C. Turn on the air pump and inflate the first airbag 21 until the pressure sensor 33 detects that the pressure in the first airbag 21 reaches a first preset pressure. Then turn off the air pump. During this process, the first airbag 21 expands, but the sidewall of the first airbag 21 is separated from the inner wall of the tube 11 by a preset distance to maintain a suitable flow area. The first preset pressure and preset distance are both determined after a limited number of tests.

[0074] D. Start the grouting pump and start grouting;

[0075] E. After the grouting is completed, the air pump is turned on to continue to inflate the first airbag 21 until the second preset pressure is reached, and the connection between the first joint 113 and the air pump is disconnected. During this process, the first airbag 21 fills the tube body 11, and the second driving assembly drives the first connecting assembly to slide outward, disconnecting the tube body 11 and the base 12, so that the tube body 11 is separated from the base 12, and the tube body 11 is pulled out. During the process of pulling out the tube body 11, the first airbag 21 grouts instead of the tube body 11, blocking the grouting hole to avoid slurry running or leakage;

[0076] F. After the slurry solidifies, the exhaust valve 32 is opened to exhaust the gas in the first airbag 21 and disconnect the second connecting assembly from the base 12. The airbag assembly can then be withdrawn, leaving the base 12 and the detection mark 41 connected to the base 12 in the grouting hole, and grouting can continue to be performed into the grouting hole to compensate for the loss of slurry caused by withdrawing the tube body 11 and the airbag assembly.

[0077] G. After the slurry in the grouting hole solidifies, the detection substrate 42 is covered on the grouting hole, and the monitoring alarm component is installed to monitor the settlement distance of the goaf after grouting, and issue an alarm when the preset distance is exceeded.

[0078] like Figure 1 and Figure 2 As shown, in a specific embodiment, step D also includes:

[0079] D1. During the grouting process, if the internal pressure of the first airbag 21 continues to increase and remains for a certain period of time, it means that the tube body 11 is blocked and cannot be unblocked by the contraction of the first airbag 21 alone. At this time, it is necessary to open the exhaust valve 32 to release the gas in the first airbag 21 to further increase the flow area and solve the blockage problem. After that, close the exhaust valve 32 and refill the first airbag 21 with gas until the first preset pressure is reached in the first airbag 21.

[0080] The beneficial effect of the grouting method for grouting in goaf provided by an embodiment of the present invention is: compared with the prior art, the grouting method for grouting in goaf provided by an embodiment of the present invention, using the above-mentioned grouting monitoring device for grouting in goaf, can effectively reduce the blockage of the pipe body. At the same time, the settlement distance of the filling body in the goaf can be monitored by the monitoring alarm component to monitor the effect after grouting in real time.

Claims

1. A grouting monitoring device for grouting in goaf, characterized in that: include: A grouting outer tube comprises a tube body (11) and a base (12); the tube body (11) is closed at the top, a plurality of slurry outlet holes (111) are provided on the side wall, and a grouting port (112) is provided on the side surface of the top; a first connecting component is provided on the base (12); the connecting component is clamped with the bottom end of the outer tube, and the connecting component has the freedom to slide relative to the base (12) along the radial direction of the base (12); The detection component comprises a detection mark rod (41), a detection substrate (42) and a monitoring alarm component, wherein the detection mark rod (41) is arranged in the pipe body (11), one end of which is connected to the base (12) and the other end of which protrudes from the grouting hole; the detection substrate (42) is covered on the grouting hole; the monitoring alarm component is arranged on the detection substrate (42) and connected to the detection mark rod (41), and is used to monitor the settlement distance of the detection mark rod (41) relative to the detection substrate (42) in the vertical direction, and to issue an alarm when a preset value is reached. Alarm; The monitoring alarm component includes two conductive sliders (43), a connecting rope (44) and an alarm element (45), the two conductive sliders (43) are respectively arranged on both sides of the detection mark (41) and are slidably connected to the detection substrate (42), the two ends of the connecting rope (44) are respectively connected to the two conductive sliders (43) and connected to the detection mark (41), and the alarm element (45) is respectively electrically connected to the two conductive sliders (43) and is used to issue an alarm when the two conductive sliders (43) are in contact; A slurry stopper (50) is sleeved on the outside of the tube body (11); An airbag assembly comprises a first airbag (21) and a second connecting assembly, wherein the first airbag (21) is arranged inside the grouting outer tube, a first joint (113) is provided at the top end, the first joint (113) protrudes from the top end of the tube body (11), and a avoidance hole is opened at the bottom end, the detection mark rod (41) is passed through the avoidance hole, the bottom end of the first airbag (21) is connected to the second connecting assembly, the second connecting assembly is connected to the base (12), and the first joint (113) is suitable for communicating with an air pump; a one-way valve (31), connected to the first connector (113); an exhaust valve (32), connected to and in communication with the first airbag (21) and protruding from the tube body (11); and a pressure sensor (33), connected to the first airbag (21) and protruding from the tube body (11); The second connecting component is adapted to drive the first connecting component to slide outward after the first airbag (21) fills the tube body (11), thereby disconnecting the tube body (11) and the base (12), and to disconnect the second connecting component from the base (12) after the gas in the first airbag (21) is exhausted; and the detection substrate (42) is adapted to be covered on the grouting hole after the tube body (11) and the airbag component are extracted.

2. The grouting monitoring device for goaf grouting according to claim 1, characterized in that: The air bag is provided with a plurality of protrusions (211), which correspond one-to-one to the plurality of slurry outlet holes (111) and are suitable for blocking the slurry outlet holes (111) after the air bag is expanded to fill the grouting outer tube.

3. The grouting monitoring device for goaf grouting according to claim 1, characterized in that: The second connecting component includes a second airbag (22) and a second joint (23). A receiving cavity is provided in the base (12), and a through hole communicating with the receiving cavity is provided on the top. The second joint (23) is provided in the through hole, with one end connected to and communicating with the first airbag (21), and the other end connected to and communicating with the second airbag (22).

4. The grouting monitoring device for goaf grouting according to claim 3, characterized in that: The second connection assembly further comprises a plurality of clamping plates (24), which are arranged around the second joint (23) and disposed in the accommodating cavity, with one end being rotatably connected to the bottom end of the second joint (23).

5. The grouting monitoring device for goaf grouting according to claim 3, characterized in that: The first connecting component includes a plurality of T-shaped blocks (13) and a plurality of sliders (14); the base (12) is provided with a plurality of slide grooves in a circumferential direction; the plurality of slide grooves are communicated with the accommodating cavity; the plurality of sliders (14) are respectively slidably matched with the plurality of slide grooves; one end of the plurality of sliders (14) is respectively connected to the T-shaped block (13) and the other end is placed in the accommodating cavity and has the freedom to slide along the slide groove; the outer side of the bottom of the tube body (11) is provided with a plurality of T-shaped grooves in a circumferential direction; one end of the plurality of T-shaped blocks (13) is respectively connected to the plurality of sliders (14) and the other end is respectively clamped in the plurality of T-shaped grooves.

6. The grouting monitoring device for goaf grouting according to claim 5, characterized in that: The slider (14) is in a T-shaped structure. The small diameter portion of the slider (14) is arranged in the slide groove and slides with the slide groove. The large diameter portion of the slider (14) is arranged in the accommodating cavity and is suitable for abutting against the second airbag (22).

7. The grouting monitoring device for goaf grouting according to claim 6, characterized in that: The first connecting assembly further comprises a plurality of springs (15), wherein the plurality of springs (15) are respectively sleeved on the small diameter portions of the plurality of sliders (14), one end of the springs is connected to the inner wall of the accommodating cavity, and the other end is connected to the large diameter portion of the slider (14).

8. A method for grouting a goaf, characterized in that: Grouting is performed using the grouting monitoring device for goaf grouting as described in any one of claims 1 to 7, and the operating steps are as follows: A. Use drilling tools to drill grouting holes leading to the goaf above the required goaf; B, inserting a grouting pipe for grouting the well into the grouting hole, connecting the grouting port (112) to the grouting pump, and connecting the first joint (113) to the air pump; C, turning on the air pump to inflate the first airbag (21) until the pressure sensor (33) detects that the pressure in the first airbag (21) reaches a first preset pressure, and then turning off the air pump. During this process, the first airbag (21) expands, but the side wall of the first airbag (21) is spaced from the inner wall of the tube (11) by a preset distance to maintain a suitable flow area; the first preset pressure and the preset distance are both obtained by summarizing a limited number of tests; D. Start the grouting pump and start grouting; E. After the grouting is completed, the air pump is turned on to continue to inflate the first airbag (21) until a second preset pressure is reached, and the connection between the first joint (113) and the air pump is disconnected. During this process, the first airbag (21) fills the tube body (11), and the second driving component drives the first connecting component to slide outward, disconnecting the connection between the tube body (11) and the base (12), so that the tube body (11) is separated from the base (12), and the tube body (11) is pulled out. During the process of pulling out the tube body (11), the first airbag (21) grouts to replace the tube body (11), thereby blocking the grouting hole; F, after the slurry solidifies, the exhaust valve (32) is opened to exhaust the gas in the first airbag (21), and the connection between the second connecting component and the base (12) is disconnected; the airbag component can then be extracted, and the base (12) and the detection mark (41) connected to the base (12) are left in the grouting hole, and grouting is continued into the grouting hole to compensate for the loss of slurry caused by extracting the pipe body (11) and the airbag component; G. After the slurry in the grouting hole solidifies, the detection substrate (42) is covered on the grouting hole, and the monitoring alarm component is installed to monitor the settlement distance of the goaf after grouting, and to sound an alarm when the settlement distance exceeds the preset distance.

9. The goaf grouting method according to claim 8, characterized in that: The step D also includes: D1. During the grouting process, if the internal pressure of the first airbag (21) increases continuously and remains for a certain period of time, it means that the tube body (11) is blocked and cannot be unblocked by simply relying on the contraction of the first airbag (21). At this time, it is necessary to open the exhaust valve (32) to release the gas in the first airbag (21) to further increase the flow area and solve the blockage problem. After that, the exhaust valve (32) is closed and gas is refilled into the first airbag (21) until the first preset pressure is reached in the first airbag (21).

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