Roadbed cavity precise grouting device and grouting method

Abstract

The invention relates to the technical field of road disaster repair, in particular to a precise grouting device and method for a roadbed cavity, and the device comprises a first detection unit which is used for detecting the roadbed cavity; the hole digging mechanism is used for punching a first pouring hole communicated with the roadbed cavity above the roadbed cavity detected by the first detection unit; the second detection unit comprises a detection rod and a detection end, the detection end is located at one end of the detection rod, the end, connected with the detection end, of the detection rod is used for being inserted into the roadbed cavity from the first pouring hole, and the detection end is used for scanning the shape of the roadbed cavity; air in the foundation cavity can be conveniently filled, the whole foundation cavity can be conveniently filled with slurry, and the problem that non-grouting space still remains in the foundation cavity after grouting can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of roadbed disaster prevention and control, and in particular to a precise grouting device and a grouting method for roadbed cavities. Background Art

[0002] Roadbed voids are one of the common pavement disasters. When dealing with pavement disasters, the treatment of roadbed voids is one of the important contents of pavement maintenance.

[0003] In the prior art, the treatment of roadbed voids is usually carried out by using ground penetrating radar to detect the road surface. When the disaster of roadbed voids is detected, holes are drilled above the roadbed voids and slurry is injected into the roadbed voids to achieve the effect of repairing the roadbed voids.

[0004] In practical applications, due to the limited accuracy of ground penetrating radar, the shape of the roadbed cavity determined by it is only a rough shape, so the holes drilled based on this cannot be applied to the shape of the roadbed cavity. During the grouting process, it is difficult for the slurry to completely fill the entire space. In this case, the only way is to increase the grouting pressure to make the slurry fill the entire roadbed cavity as much as possible. For roadbeds with good air permeability, this method can fill the entire roadbed cavity with slurry. However, for roadbeds with poor air permeability, high-pressure air is easily formed at the top of the roadbed cavity, that is, some space will be left unfilled. With time and temperature changes, it is easy to cause cracks in the road surface above the unfilled area.

[0005] Therefore, how to completely grout the roadbed cavity is one of the important issues to be solved urgently in this field. Summary of the invention

[0006] The present disclosure is proposed in view of the above problems. The present disclosure provides a precise grouting device and a grouting method for a roadbed cavity, which can avoid the problem that un-grouted space remains in the foundation cavity after grouting.

[0007] According to one aspect of the present disclosure, a roadbed cavity precision grouting device is provided, which comprises:

[0008] A first detection unit, the first detection unit is used to detect roadbed voids;

[0009] A hole digging mechanism, used for drilling a first injection hole communicating with the roadbed cavity above the roadbed cavity detected by the first detection unit;

[0010] The second detection unit includes a detection rod and a detection end, wherein the detection end is located at one end of the detection rod, and one end of the detection rod connected to the detection end is used to be inserted into the roadbed cavity from the first injection hole, and the detection end is used to scan the shape of the roadbed cavity; the digging mechanism is also used to dig an exhaust hole connected to the roadbed cavity at a injection point selected according to the shape of the roadbed cavity, and to dig a second injection hole connected to the roadbed cavity at a injection point selected according to the shape of the roadbed cavity;

[0011] The exhaust mechanism is installed at the exhaust hole and is used to exhaust air during grouting, and the pressure in the roadbed cavity is adjusted by adjusting the exhaust volume;

[0012] An air tightness detection unit, used to cooperate with the exhaust mechanism to detect the air tightness of the side wall of the roadbed cavity;

[0013] The grouting mechanism determines the grouting pressure according to the test result of the air tightness testing unit, and performs grouting according to the grouting pressure.

[0014] The roadbed cavity precise grouting device as described above, wherein, optionally, the first detection unit is a pathfinder radar, which is used to determine the approximate location of the roadbed cavity;

[0015] The detection end is a laser rangefinder, which is used to scan the contour of the roadbed cavity;

[0016] The second detection unit further includes a controller, which is used to obtain the measurement result of the detection end; and calculate the volume of the foundation cavity according to the measurement result and display the three-dimensional shape of the roadbed cavity in a coordinate system with the intersection of the center line of the first injection hole and the road surface as the origin;

[0017] The controller is also used to determine the highest point of the roadbed cavity and set the highest point as the exhaust point.

[0018] The roadbed cavity precision grouting device as described above, wherein, optionally, an opening is provided on one side of the detection end, and a laser source and a receiving end are provided in the detection end;

[0019] The laser source emits a line laser along the opening;

[0020] The detection rod rotates one circle along its center line, and the line laser scans to obtain the outline of the roadbed cavity.

[0021] The roadbed cavity precision grouting device as described above, wherein, optionally, the detection rod is further provided with a vent hole, the outlet end of the vent hole is located on the side wall of the detection rod, and the outlet of the vent hole is located above the detection end;

[0022] The vent hole is used to let in high-pressure gas, so as to blow air toward the top of the roadbed cavity through the high-pressure gas, so as to clean the top of the roadbed cavity.

[0023] The precise grouting device for roadbed voids as described above, optionally, further includes a purging unit, wherein the purging unit includes a high-pressure air pump, and the outlet of the high-pressure air pump is connected to the vent hole; the inlet of the high-pressure air pump can be connected to the exhaust mechanism, so that when the top wall of the roadbed void is purged, the air can circulate in the high-pressure air pump, the vent hole, the roadbed void, and the exhaust mechanism in sequence to prevent the pressure in the roadbed void from being too high.

[0024] The roadbed cavity precision grouting device as described above, wherein, optionally, the exhaust mechanism comprises an exhaust pipe and a compression sleeve arranged on the outer periphery of the exhaust pipe, and the compression sleeve is used to seal the gap between the exhaust pipe and the exhaust hole;

[0025] The compression sleeve is arranged on the outer circumference of the exhaust pipe, and an air chamber is formed between the compression sleeve and the exhaust pipe. The air chamber is provided with a charging and discharging hole, and the inflation and exhaust of the compression sleeve are realized through the charging and discharging hole to realize the fixation between the exhaust pipe and the exhaust hole.

[0026] The precise grouting device for roadbed cavities as described above, wherein, optionally, a fastening assembly is further provided on the exhaust pipe, the fastening assembly is arranged at the bottom of the exhaust pipe, and a claw is provided on the fastening assembly, and the claw is installed in a groove of a side wall at the bottom of the exhaust pipe;

[0027] The lower end of the claw is rotatably connected to the exhaust pipe;

[0028] A slider is slidably arranged in the groove, and the slider is driven by the high-pressure gas in the gas chamber;

[0029] The slider is rotatably connected to one end of a connecting rod, and the other end of the connecting rod is rotatably connected to the middle part of the claw;

[0030] The groove is provided with a piston hole communicated with the air chamber, a piston is slidably installed in the piston hole, and the sliding block is fixedly connected to the piston.

[0031] In the roadbed cavity precision grouting device as described above, optionally, an exhaust valve is provided at the upper end of the exhaust pipe, and the exhaust valve is used to control the exhaust speed.

[0032] The present invention also proposes a roadbed cavity grouting method, which comprises the following steps:

[0033] S1, obtain the location and shape of the roadbed cavity through ground penetrating radar;

[0034] S2, opening the first pouring hole at the center of the corresponding roadbed cavity;

[0035] S3, inserting the end of the detection rod with the detection end into the roadbed cavity through the first pouring hole;

[0036] S4, the first contour scan of the inner wall of the roadbed cavity is performed;

[0037] S5, determining the highest point of the inner wall of the roadbed cavity according to the result of the first contour scanning, and opening an exhaust hole at the highest point;

[0038] S6, install an exhaust mechanism at the exhaust hole to blow the top of the roadbed cavity to make the loose soil fall;

[0039] S7, perform a second profile scan of the roadbed void;

[0040] S8, determining whether to update the exhaust hole according to the result of the second profile scan; if the exhaust hole needs to be updated, closing the exhaust mechanism of the original exhaust hole and installing the exhaust mechanism at the updated exhaust hole;

[0041] S9, closing the exhaust mechanism, filling the roadbed cavity with gas at a set pressure, and monitoring the pressure drop rate to perform air tightness detection;

[0042] S10, according to the air tightness test result, controlling the exhaust speed of the exhaust mechanism and the grouting speed; until the slurry reaches the exhaust mechanism;

[0043] S11, close the exhaust mechanism and maintain the pressure in the roadbed cavity at the set pressure for 10 to 30 minutes.

[0044] In the roadbed cavity grouting method as described above, optionally, in step S10, the worse the air tightness is, the smaller the opening of the exhaust mechanism is.

[0045] According to a precise grouting device and grouting method for roadbed cavities proposed in the present disclosure, before grouting, the contour of the foundation cavity is scanned to determine the exhaust point and the grouting point according to the shape of the foundation cavity. By selecting the exhaust point and the grouting point according to the shape of the foundation cavity, it is convenient to remove the air in the foundation cavity and fill the entire foundation cavity with slurry, which can avoid the problem of residual un-grouted space in the foundation cavity after grouting.

[0046] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and other purposes, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0048] Figure 1 It is a structural schematic diagram of the first pouring hole provided by the present invention, which is provided above the roadbed cavity;

[0049] Figure 2 It is a schematic diagram of the structure of the present invention when purging;

[0050] Figure 3 It is a schematic diagram of the structure of the present invention when performing air tightness test;

[0051] Figure 4 is a partial enlarged schematic diagram of the exhaust mechanism proposed by the present invention;

[0052] Figure 5 It is a control block diagram of the present invention;

[0053] Figure 6 It is a flow chart of the steps of the method proposed by the present invention.

[0054] 1- roadbed cavity, 2- second detection unit, 3- exhaust mechanism, 4- air tightness detection unit, 5- grouting mechanism, 6- purge unit;

[0055] 11-first filling hole, 12-exhaust hole, 13-second filling hole;

[0056] 21-detection rod, 22-detection end, 23-controller;

[0057] 211- vent hole;

[0058] 31-exhaust pipe, 32-compression sleeve, 33-air chamber, 34-fastening assembly, 35-connecting rod,

[0059] 311-groove, 312-slider, 313-piston hole, 314-piston, 315-exhaust valve,

[0060] 331- charging and discharging hole;

[0061] 341-claw;

[0062] 61- High pressure air pump. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present disclosure more obvious, the exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described here.

[0064] In response to the problems raised in the background technology, the present disclosure proposes the following embodiments to solve them.

[0065] Embodiment 1:

[0066] Please refer to Figures 1 to 5 This embodiment proposes a precise grouting device for roadbed cavities, which includes a first detection unit, a hole digging mechanism, a second detection unit 2, an exhaust mechanism 3, an air tightness detection unit 4 and a grouting mechanism 5. The first detection unit is the current ground penetrating radar, which is used to identify and determine the foundation cavity through the ground penetrating radar. This is a prior art for those skilled in the art, and will not be described in detail in this disclosure. Those skilled in the art can implement it. For the hole digging mechanism, it is the same as the drilling device used in the prior art. A circular hole is dug out on the roadbed by a drill bit. This is also a prior art for those skilled in the art, and will not be described in detail in this disclosure. Those skilled in the art can implement it. For the grouting mechanism 5, it is the same as the grouting mechanism used for grouting roadbed cavities in the prior art, and it also belongs to the prior art. It will not be described in detail in this disclosure. Those skilled in the art can implement it. The second detection unit 2 is used to scan the internal contour of the cavity to obtain the shape of the foundation cavity, so as to determine the position of the exhaust hole and the injection hole according to the actual situation of the foundation cavity. The exhaust mechanism 3 is used to exhaust gas during grouting and purging, so as to facilitate the exhaust of gas in the foundation cavity and avoid the problem that the foundation cavity cannot be completely filled due to the inability to exhaust gas during the grouting process. The airtightness detection unit 4 is used to detect the airtightness around the foundation cavity, so as to control the grouting process according to the airtightness of the inner wall of the foundation cavity.

[0067] Specifically, the first detection unit is used to detect the roadbed cavity 1; that is, to find the location of the roadbed cavity. When used specifically, a ground penetrating radar in the prior art is used as the first detection unit. The ground penetrating radar is moved back and forth on the road surface to determine the location and approximate shape of the roadbed cavity 1 based on the returned signal.

[0068] The hole-digging mechanism is used to drill a first perfusion hole 11 connected to the roadbed cavity 1 above the roadbed cavity 1 detected by the first detection unit; in specific implementation, the position of the first perfusion hole 11 is based on the detection result of the first detection unit. When selecting the position of the first perfusion hole 11, try to select the position of the first perfusion hole 11 directly above the center point of the roadbed cavity 1. The first perfusion hole 11 is used as a possible perfusion hole for perfusion. More importantly, the first perfusion hole 11 is used for detection by the second detection unit 2, and the high-pressure gas is used to purge the inner wall of the roadbed cavity 1.

[0069] The second detection unit 2 includes a detection rod 21 and a detection terminal 22, wherein the detection terminal 22 is located at one end of the detection rod 21, and one end of the detection rod 21 connected to the detection terminal 22 is used to be inserted into the roadbed cavity 1 from the first pouring hole 11, and the detection terminal 22 is used to scan the shape of the roadbed cavity 1; the digging mechanism is also used to dig out an exhaust hole 12 connected to the roadbed cavity 1 at a pouring point selected according to the shape of the roadbed cavity 1, and to dig out a second pouring hole 13 connected to the roadbed cavity 1 at a pouring point selected according to the shape of the roadbed cavity 1.

[0070] The three-dimensional shape of the roadbed cavity is obtained by the detection terminal 22, so as to determine the position of the vent hole 12 and the position of the second injection hole 13 according to the three-dimensional shape of the roadbed cavity. The principle for selecting the position of the vent hole 12 and the position of the second injection hole 13 is that the vent hole 12 is located at the highest point on the top of the roadbed cavity, and the position of the second injection hole 13 is preferably the farthest from the vent hole 12. For a roadbed cavity structure with multiple domes, an vent hole 12 is set at each dome.

[0071] The exhaust mechanism 3 is installed at the exhaust hole 12, which is used to exhaust during grouting, and adjusts the pressure in the roadbed cavity 1 by adjusting the exhaust volume. The exhaust mechanism 3 is used to control the exhaust in the cavity. At the same time, the exhaust mechanism 3 can also achieve pressure maintenance during the grouting process by closing the exhaust channel.

[0072] The air tightness detection unit 4 is used to cooperate with the exhaust mechanism 3 to detect the air tightness of the side wall of the roadbed cavity 1; the purpose of detecting the air tightness is to determine the opening of the exhaust valve of each exhaust mechanism 3 during the grouting process according to the air tightness. The grouting mechanism 5 is used to determine the grouting pressure according to the detection result of the air tightness detection unit 4, and to perform grouting according to the grouting pressure. Through the air tightness detection unit 4, it is convenient to carry out targeted grouting for foundations with different air tightness. For foundations with low air tightness, low-pressure grouting can be carried out when the exhaust hole 12 is opened small, such as the opening of the exhaust hole 12 is not more than 20%, and the pressure is maintained after the grouting is completed. When the air tightness detected by the air tightness detection unit 4 is high, high-pressure grouting can be carried out when the exhaust hole 12 is opened widely, such as the opening of the exhaust hole 12 is not less than 50%, and the high-pressure pressure is maintained after the grouting is completed.

[0073] Through the present invention, by setting the exhaust hole 12 at the dome, it is helpful to promote the discharge of gas in the roadbed cavity 1, and avoid the gas remaining and being compressed in the roadbed cavity 1 after grouting. At the same time, through the air tightness detection unit 4, the grouting pressure can be adjusted in a targeted manner according to the air tightness of the road surface around the roadbed cavity 1, so as to avoid abnormal leakage around the roadbed outside the slurry due to excessive pressure.

[0074] The first detection unit is a pathfinder radar, which is used to determine the approximate position of the roadbed cavity 1; in a specific implementation, in order to accurately measure the contour of the roadbed cavity, the detection end 22 is a laser rangefinder, which is used to scan the contour of the roadbed cavity 1; in a specific implementation, the laser rangefinder is a line laser or a plurality of point lasers arranged in an array.

[0075] The second detection unit 2 also includes a controller 23, which is used to obtain the measurement results of the detection terminal 22; and calculate the volume of the roadbed cavity based on the measurement results and display the three-dimensional shape of the roadbed cavity 1 in a coordinate system with the intersection of the center line of the first injection hole 11 and the road surface as the origin.

[0076] In specific implementation, a three-dimensional coordinate system can be established with the center of the upper opening of the first injection hole 11 as the origin. A polar coordinate system is established in the horizontal plane with the center of the upper opening of the first injection hole 11 as the origin, and then the vertical direction is added as the vertical axis to form a three-dimensional coordinate system.

[0077] When estimating the volume of roadbed voids, it can be estimated through double integration. The purpose of estimating the volume of roadbed voids is to facilitate accurate control of the amount of filling slurry.

[0078] The purpose of obtaining the contour of the roadbed cavity is to select the exhaust point and the grouting point. Specifically, the controller 23 is also used to determine the highest point of the roadbed cavity 1, and to set the highest point as the exhaust point. The grouting point is determined according to the shape of the roadbed cavity 1 and the position of the exhaust point. The principle of determining the grouting point is to be as far away from the exhaust point as possible, and the minimum distance from the inner wall of the roadbed cavity 1 should be no less than 10 cm.

[0079] An opening is provided on one side of the detection end 22, and a laser source and a receiving end are provided inside the detection end 22; the laser source emits a line laser along the opening; the detection rod 21 rotates one circle along its center line, and the line laser scans to obtain the outline of the roadbed cavity 1. In specific implementation, in order to feed back the detection results to the controller and display them on the display, before measurement, a line passing through the origin of the coordinates should be drawn on the road surface as the X-axis, and a line should be drawn on the side of the detection rod 21 where the laser is emitted, so that the side of the line is aligned with the line passing through the origin of the coordinates, that is, the laser emission direction of the detection rod 21 is consistent with the X-axis direction. When the detection rod 21 rotates one circle, the scanning of the roadbed cavity 1 is completed.

[0080] In specific implementation, when grouting the roadbed cavity, there may be loosely connected soil blocks or soil layers on the top of the roadbed cavity. If grouting is performed directly, the soil blocks or soil layers are located at the top, and greater pressure is required to press the soil blocks against the top of the roadbed cavity, and it is difficult for the material to enter between the soil blocks and the side walls of the roadbed cavity, resulting in a certain looseness after the top grouting. This looseness is caused by the difficulty in filling the gap between the loosely attached top soil blocks and the inner wall of the roadbed cavity. For this reason, the present embodiment further proposes that the detection rod 21 is also provided with a vent hole 211, the outlet end of the vent hole 211 is located on the side wall of the detection rod 21, and the outlet of the vent hole 211 is located above the detection end 22; the vent hole 211 is used to introduce high-pressure gas to blow air to the top of the roadbed cavity 1 through the high-pressure gas to clean the top of the roadbed cavity 1.

[0081] By cleaning the top of the roadbed cavity 1, loosely connected soil blocks are cleaned up, and the cleaned soil blocks fall to the bottom of the roadbed cavity 1. After grouting, the soft soil blocks at the bottom of the roadbed cavity are compacted to the bottom of the roadbed cavity 1 under the dual effects of the slurry gravity and the pressure used in the pressure-maintaining process. At the same time, due to the flow of the slurry, the slurry can also fully enter between the soft soil blocks and the bottom of the roadbed cavity 1. In the specific implementation, in order to achieve this effect, it also includes a purge unit 6, the purge unit 6 includes a high-pressure air pump 61, and the outlet of the high-pressure air pump 61 is connected to the vent 211; in the specific implementation, when the top of the inner surface of the roadbed cavity is purged, the required gas pressure and gas flow are relatively large, which easily causes excessive pressure in the roadbed cavity and causes damage to the roadbed. In order to ensure that the gas flow in the roadbed cavity is increased without significantly changing the gas pressure in the roadbed cavity, in this embodiment, the inlet of the high-pressure air pump 61 can be connected to the exhaust mechanism 3, so that when the top wall of the roadbed cavity 1 is purged, the air can circulate in the high-pressure air pump 61, the vent 211, the roadbed cavity 1, and the exhaust mechanism 3 in turn to prevent the pressure in the roadbed cavity 1 from being too high. Since the roadbed cavity may cause the contour of the roadbed cavity to change when the purging is completed, the roadbed cavity can be scanned again according to actual needs. Determine whether to update the position of the exhaust hole and the second injection hole based on the result of the contour scanning. The main principle for updating the position of the exhaust hole is: whether the dome of the roadbed cavity changes, when the highest point of the dome does not change, when the highest point of the dome changes, according to the change distance, when the horizontal offset of the highest point of the dome is greater than 20 cm and the vertical offset is greater than 20 cm, update the exhaust hole position. The original exhaust hole can be blocked by the exhaust mechanism 3 and is no longer used for exhaust. The updated vent position is located at the dome of the roadbed cavity. Since there may be multiple domes on the top of the roadbed cavity, the number of updated vents is multiple. In practical applications, in order to save unnecessary labor, the number of vents can be reduced when digging the vents for the first time, for example, only 1 to 3 vents can be dug.

[0082] In the specific implementation, in order to facilitate exhaust and control the pressure in the roadbed cavity during grouting, the exhaust mechanism 3 is further designed in this embodiment. Specifically, the exhaust mechanism 3 includes an exhaust pipe 31 and a compression sleeve 32 arranged on the outer periphery of the exhaust pipe 31. The compression sleeve 32 is used to seal the gap between the exhaust pipe 31 and the exhaust hole 12. The function of the compression sleeve 32 is to fix the exhaust pipe 31 and the exhaust hole 12 to prevent the exhaust mechanism 3 from being squeezed out due to excessive pressure in the roadbed cavity during the grouting process. In order to facilitate more accurate control of the exhaust process, it is necessary to seal the exhaust pipe 31 and the exhaust hole 12. Specifically, the compression sleeve 32 is sleeved on the outer periphery of the exhaust pipe 31, and an air chamber 33 is formed between the compression sleeve 32 and the exhaust pipe 31. The air chamber 33 is provided with a charging and discharging hole 331. The charging and discharging hole 331 is used to realize the inflation and exhaust of the compression sleeve 32, so as to realize the fixation between the exhaust pipe 31 and the exhaust hole 12.

[0083] In specific implementation, the principle of fixing the exhaust pipe 31 by the compression sleeve 32 is to use the friction between the compression sleeve 32 and the exhaust hole 12. This implementation requires a relatively large pressure to ensure that the required friction is achieved, and the pressure in the compression sleeve 32 is too large, which is easy to damage the roadbed. Therefore, in order to avoid damage to the roadbed, this embodiment further provides a fastening assembly 34. Specifically, the fastening assembly 34 is arranged at the bottom of the exhaust pipe 31. The fastening assembly 34 is provided with a claw 341, and the claw 341 is installed in the groove 311 of the side wall of the bottom of the exhaust pipe 31.

[0084] In a specific implementation, the lower end of the claw 341 is rotatably connected to the exhaust pipe 31; the rotation center line of the two is perpendicular to the center line of the exhaust pipe 31. A slider 312 is slidably arranged in the groove 311, and the slider 312 can slide along the groove 311. The slider 312 is driven by the high-pressure gas in the air chamber 33; that is, the high-pressure gas in the air chamber 33 can drive the slider 312 to move. The slider 312 is rotatably connected to one end of a connecting rod 35, and the other end of the connecting rod 35 is rotatably connected to the middle part of the claw 341; in a specific implementation, the claw is opened by the movement of the slider 312, and then stuck on the exhaust hole. Specifically, a piston hole 313 connected to the air chamber 33 is provided on the groove 311, and a piston 314 is slidably installed in the piston hole 313, and the slider 312 is fixedly connected to the piston 314. By providing the piston 314, the slider 312 can be driven to slide to push the claw to open. In a specific implementation, an exhaust valve 315 is provided at the upper end of the exhaust pipe 31, and the exhaust valve 315 is used to control the exhaust speed. By controlling the exhaust speed of the exhaust valve 315, the gas pressure in the roadbed cavity can be adjusted, which is beneficial to the adjustment of the pressure in the roadbed cavity during the entire construction process.

[0085] In a specific implementation, in order to facilitate monitoring of the pressure in the foundation cavity, a pressure sensor may be provided at the bottom of the exhaust structure to measure the pressure in the foundation cavity in real time.

[0086] Embodiment 2:

[0087] Please refer to Figure 6 In view of the problems raised in the background technology, this embodiment proposes a roadbed cavity grouting method, comprising the following steps:

[0088] S1, the position and shape of the roadbed cavity 1 are obtained by ground penetrating radar; the position and shape of the roadbed cavity 1 obtained by the ground penetrating radar, in specific implementation, the ground penetrating radar is used to detect along the road surface, but the ground penetrating radar can only obtain the position and shape of the roadbed cavity 1, which is only an approximate position and shape and is not accurate.

[0089] S2, opening a first injection hole 11 at the center position corresponding to the roadbed cavity 1; the center position in this step is based on the detection result of the ground penetrating radar, and by setting the first injection hole 11 at the center line position, it can be ensured that the first injection hole 11 is above the roadbed cavity 1 and can be connected with the foundation cavity to reduce the impact on detection accuracy.

[0090] S3, insert one end of the detection rod 21 with the detection terminal 22 into the roadbed cavity 1 through the first injection hole 11; the detection rod 21 mainly detects the internal shape of the roadbed cavity, so as to select the best vent position and the second injection hole position according to the internal shape of the roadbed cavity. In practical applications, the detection terminal 22 can also be used to detect whether there are other roadbed cavities below the roadbed cavity. For example, the detection terminal 22 can be a structure with a radar probe installed. When it is detected that there are still roadbed cavities below, the roadbed cavity below is injected first.

[0091] S4, the inner wall of the roadbed cavity 1 is scanned for the first contour; the purpose of the first contour scan is to determine the shape of the roadbed cavity 1, so as to select the vent 12. In specific implementation, the first contour scan can be performed by a line laser, and the inner wall of the roadbed cavity can be fully scanned by rotating the detection rod 21, so as to determine the best position of the vent 12 for the roadbed cavity.

[0092] S5, according to the result of the first contour scan, determine the highest point of the inner wall of the roadbed cavity 1, and open a vent hole 12 at the highest point; in specific implementation, there may usually be multiple domes in the roadbed cavity 1, and in this step, the dome whose highest point is closest to the ground is used as the vent hole. That is, in this step, only one vent hole 12 can be dug. Setting the vent hole at the dome position of the roadbed cavity can facilitate exhausting the gas in the roadbed cavity during grouting, so as to completely grout the roadbed cavity.

[0093] S6, install the exhaust mechanism 3 at the exhaust hole 12, and blow the top of the roadbed cavity 1 to make the loose soil blocks fall down; the method of blowing the top wall of the roadbed cavity 1 is to blow and purge high-pressure air through the ventilation hole in the detection rod to make the soil blocks that are not tightly attached to the inner wall of the roadbed cavity 1 fall off. The purpose of this step is to make the soil blocks that are easy to fall off fall to the bottom of the roadbed cavity to ensure that a more stable structure is formed at the top during the grouting process. Making the soil blocks that are easy to fall off from the top fall is conducive to preventing the formation of narrow gaps at the top of the roadbed cavity. If a narrow gap is formed at the top of the roadbed cavity, the slurry squeezes the loose soil blocks from bottom to top during grouting, and the required pressure is relatively large. However, through the present disclosure, the soil blocks that are easy to fall off are first cleaned to the bottom of the roadbed cavity 1. During grouting, the combined effect of the gravity of the slurry and the grouting pressure can make the fallen soil blocks easier to be compacted, thereby reducing the demand for slurry pressure. On the other hand, removing the loose soil on the top will help find a better exhaust position to ensure that the gas in the roadbed cavity can be completely discharged during grouting.

[0094] S7, perform a second contour scan on the roadbed cavity; the purpose of performing a second contour scan on the roadbed cavity is that the purge in step S6 may cause the shape of the top of the roadbed cavity to change, thereby causing the dome of the roadbed cavity to change, that is, the most suitable position for setting the vent hole may change. In order to obtain the best vent position so that the slurry can fill the entire roadbed cavity, this step performs a second contour scan. After the second contour scan, the result obtained is the shape after the loose soil blocks on the top of the roadbed cavity are cleaned up. Compared with the first contour scan, the result obtained by the second contour scan is more accurate.

[0095] S8, based on the result of the second contour scan, determine whether to update the exhaust hole 12; if the exhaust hole 12 needs to be updated, the exhaust mechanism 3 of the original exhaust hole 12 will be closed. Of course, the original exhaust hole 12 can also be blocked with other structures. Install the exhaust mechanism 3 at the updated exhaust hole 12. The basis for determining whether the exhaust hole 12 needs to be updated is whether a new, higher dome is formed in the roadbed cavity. When the position of the formed new dome is higher than the height of the dome where the exhaust hole 12 is located, the position of the exhaust hole 12 should be updated. The update of the exhaust hole 12 can be done by increasing the number of exhaust holes 12 or by opening a new exhaust hole 12 and blocking the original exhaust hole 12.

[0096] S9, close the exhaust mechanism 3, and seal the first and second injection holes, fill the roadbed cavity 1 with gas of set pressure through the detection rod, and monitor the pressure drop rate to perform air tightness detection. The roadbed cavity 1 is tested for air tightness, which is mainly used to provide a reference and basis for the pressure setting during grouting. In this step, the air tightness of the soil layer around the roadbed cavity 1 is detected by filling gas into the roadbed cavity 1, and the exhaust rate is determined based on the air tightness.

[0097] S10, according to the air tightness test result, control the exhaust speed and grouting speed of the exhaust mechanism 3; until the slurry reaches the exhaust mechanism 3. In real time, grouting is performed simultaneously through the first grouting hole and the second grouting hole. The test result can be directly compared with the set air tightness value. When the test result is greater than the set air tightness value, the grouting pressure and grouting speed can be reduced, and at the same time, the opening of the exhaust hole on the exhaust mechanism 3 can be increased so that the gas in the roadbed cavity can be discharged smoothly. When the test result is less than the set air tightness value, the grouting pressure and grouting speed can be appropriately increased, and at the same time, the opening of the air hole on the exhaust mechanism 3 can be reduced, so that the slurry can be diffused to the surroundings to improve the combination of the slurry and the surrounding land. In this step, the worse the air tightness, the smaller the opening of the exhaust mechanism 3. Specifically, the worse the air tightness, the less likely it is to form high pressure in the roadbed cavity. Therefore, the opening of the exhaust mechanism 3 can be reduced or the exhaust mechanism 3 can be completely closed so that the slurry can be grouted at the set pressure. When the air tightness is better, it is easier to form high pressure in the roadbed cavity, and the gas in the roadbed cavity is more difficult to be completely discharged. The gas in the roadbed cavity can be easily discharged by using the exhaust hole 12 opened at the dome. That is, when the air tightness is better, the opening of the exhaust mechanism 3 should be increased to discharge the gas as much as possible.

[0098] S11, close the exhaust mechanism 3, and maintain the pressure in the roadbed cavity 1 at the set pressure for 10 to 30 minutes. When implemented, the set pressure can be 1-2MPa. By pressurizing the slurry that has not yet solidified, it is beneficial for the slurry to diffuse into the peripheral roadbed, and it is beneficial for the slurry to form a whole with the surrounding roadbed, so that the filling effect is better.

[0099] The present invention performs two contour scans on the foundation cavity before grouting to determine the exhaust point and the grouting point according to the shape of the foundation cavity. After cleaning the soil blocks that are easy to fall off in the roadbed cavity, the exhaust point and the grouting point are selected according to the shape of the foundation cavity, which can facilitate the air in the foundation cavity and facilitate the slurry to fill the entire foundation cavity, and can avoid the problem of residual un-grouted space in the foundation cavity after grouting.

[0100] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0101] The block diagrams of the devices, apparatuses, equipment, and systems involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including," "comprising," "having," and the like are open words, referring to "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or," and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0102] Additionally, as used herein, "or" used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not mean that the example described is preferred or better than other examples.

[0103] It should also be noted that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0104] Various changes, substitutions, and modifications of the techniques described herein may be made without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of the present disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and actions described above. Currently existing or later to be developed processes, machines, manufactures, compositions of events, means, methods, or actions that perform substantially the same functions or achieve substantially the same results as the corresponding aspects described herein may be utilized. Thus, the appended claims include such processes, machines, manufactures, compositions of events, means, methods, or actions within their scope.

[0105] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0106] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A precise grouting device for roadbed cavities, characterized in that: include, A first detection unit, the first detection unit is used to detect roadbed voids (1); A hole digging mechanism, used for drilling a first injection hole (11) communicating with the roadbed cavity (1) above the roadbed cavity (1) detected by the first detection unit; A second detection unit (2) comprises a detection rod (21) and a detection end (22), wherein the detection end (22) is located at one end of the detection rod (21), and one end of the detection rod (21) connected to the detection end (22) is used to be inserted from the first injection hole (11) into the roadbed cavity (1), and the detection end (22) is used to scan the shape of the roadbed cavity (1); the hole digging mechanism is also used to dig out an exhaust hole (12) connected to the roadbed cavity (1) at an injection point selected according to the shape of the roadbed cavity (1), and to dig out a second injection hole (13) connected to the roadbed cavity (1) at an injection point selected according to the shape of the roadbed cavity (1); An exhaust mechanism (3) is installed at the exhaust hole (12) and is used to exhaust air during grouting, and to adjust the pressure in the roadbed cavity (1) by adjusting the exhaust volume; An air tightness detection unit (4) for cooperating with the exhaust mechanism (3) to detect the air tightness of the side wall of the roadbed cavity (1); The grouting mechanism (5) determines the grouting pressure according to the detection result of the air tightness detection unit (4), and performs grouting according to the grouting pressure.

2. The precise grouting device for roadbed cavities according to claim 1 is characterized in that: The first detection unit is a pathfinder radar, which is used to determine the approximate location of the roadbed cavity (1); The detection end (22) is a laser rangefinder, which is used to scan the contour of the roadbed cavity (1); The second detection unit (2) further comprises a controller (23), wherein the controller (23) is used to obtain the measurement result of the detection end (22); calculate the volume of the foundation cavity according to the measurement result, and display the three-dimensional shape of the roadbed cavity (1) on a coordinate system with the intersection of the center line of the first injection hole (11) and the road surface as the origin; The controller (23) is also used to determine the highest point of the roadbed cavity (1), and to set the highest point as the exhaust point.

3. The precise grouting device for roadbed cavities according to claim 2 is characterized in that: An opening is provided on one side of the detection end (22), and a laser source and a receiving end are provided inside the detection end (22); The laser source emits a line laser along the opening; The detection rod (21) rotates one circle along its center line, and the line laser scanning obtains the outline of the roadbed cavity (1).

4. The precise grouting device for roadbed cavities according to claim 1, characterized in that: The detection rod (21) is also provided with a vent hole (211), the outlet end of the vent hole (211) is located on the side wall of the detection rod (21), and the outlet of the vent hole (211) is located above the detection end (22); The vent hole (211) is used to allow high-pressure gas to be introduced, so as to blow air toward the top of the roadbed cavity (1) through the high-pressure gas, thereby cleaning the top of the roadbed cavity (1).

5. The precise grouting device for roadbed cavities according to claim 4 is characterized in that: The invention also comprises a purging unit (6), the purging unit (6) comprising a high-pressure air pump (61), the outlet of the high-pressure air pump (61) being connected to the vent hole (211); the inlet of the high-pressure air pump (61) being able to be connected to the exhaust mechanism (3), so that when the top wall of the roadbed cavity (1) is purged, the air can circulate in the high-pressure air pump (61), the vent hole (211), the roadbed cavity (1), and the exhaust mechanism (3) in sequence, so as to prevent the pressure in the roadbed cavity (1) from being too high.

6. The precise grouting device for roadbed cavities according to claim 1, characterized in that: The exhaust mechanism (3) comprises an exhaust pipe (31) and a compression sleeve (32) arranged on the outer periphery of the exhaust pipe (31), wherein the compression sleeve (32) is used to seal the gap between the exhaust pipe (31) and the exhaust hole (12); The compression sleeve (32) is sleeved on the outer circumference of the exhaust pipe (31), an air chamber (33) is formed between the compression sleeve (32) and the exhaust pipe (31), and a charging and discharging hole (331) is provided on the air chamber (33), and the charging and discharging hole (331) is used to realize the inflation and exhaust of the compression sleeve (32), so as to realize the fixation between the exhaust pipe (31) and the exhaust hole (12).

7. The precise grouting device for roadbed cavities according to claim 6, characterized in that: The exhaust pipe (31) is also provided with a fastening assembly (34), the fastening assembly (34) being arranged at the bottom of the exhaust pipe (31), the fastening assembly (34) being provided with a claw (341), the claw (341) being installed in a groove (311) of a side wall at the bottom of the exhaust pipe (31); The lower end of the claw (341) is rotatably connected to the exhaust pipe (31); A sliding block (312) is slidably disposed in the groove (311), and the sliding block (312) is driven by the high-pressure gas in the gas chamber (33); The slider (312) is rotatably connected to one end of a connecting rod (35), and the other end of the connecting rod (35) is rotatably connected to the middle part of the claw (341); The groove (311) is provided with a piston hole (313) which is in communication with the air chamber (33), a piston (314) is slidably mounted in the piston hole (313), and the sliding block (312) is fixedly connected to the piston (314).

8. The precise grouting device for roadbed cavities according to claim 7, characterized in that: An exhaust valve (315) is provided at the upper end of the exhaust pipe (31), and the exhaust valve (315) is used to control the exhaust speed.

9. A roadbed cavity grouting method, characterized in that: The following steps are involved: S1, obtain the location and shape of the roadbed cavity (1) through ground penetrating radar; S2, opening a first injection hole (11) at the center of the corresponding roadbed cavity (1); S3, inserting one end of the detection rod (21) with the detection end (22) into the roadbed cavity (1) through the first pouring hole (11); S4, performing a first contour scan on the inner wall of the roadbed cavity (1); S5, determining the highest point of the inner wall of the roadbed cavity (1) according to the result of the first contour scan, and opening an exhaust hole (12) at the highest point; S6, installing an exhaust mechanism (3) at the exhaust hole (12) to blow the top of the roadbed cavity (1) to make loose soil fall down; S7, perform a second profile scan of the roadbed void; S8, determining whether to update the exhaust hole (12) based on the result of the second contour scan; if the exhaust hole (12) needs to be updated, closing the exhaust mechanism (3) of the original exhaust hole (12), and installing the exhaust mechanism (3) at the updated exhaust hole (12); S9, closing the exhaust mechanism (3), filling the roadbed cavity (1) with gas at a set pressure, and monitoring the pressure drop rate to perform air tightness detection; S10, controlling the exhaust speed of the exhaust mechanism (3) and the grouting speed according to the air tightness test result, until the slurry reaches the exhaust mechanism (3); S11, closing the exhaust mechanism (3) to maintain the pressure in the roadbed cavity (1) at the set pressure for 10 to 30 minutes.

10. The roadbed cavity grouting method according to claim 9, characterized in that: In step S10, the worse the airtightness is, the smaller the opening of the exhaust mechanism (3) is.

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