Tunnel lining crack repairing device and repairing method

Abstract

The invention relates to a tunnel lining crack repairing device and method, and the device comprises a grinding mechanism which is used for grinding and cleaning the inner wall of a crack and comprises a first shell, a first rotation driving part is arranged in the first shell, and an output shaft of the first rotation driving part penetrates through the shell wall of the grinding end of the first shell and then is connected with a grinding drill bit; a plurality of fan blades are arranged on the portion, located in the first shell, of an output shaft of the first rotation driving piece in the annular direction, and a plurality of air outlets are formed in the shell wall of the polishing end of the first shell; the filling mechanism is used for filling the crack with a repairing material after the inner wall of the crack is polished and cleaned through the polishing mechanism and comprises a second shell, a material bottle is arranged in the second shell, a piston is arranged in the material bottle and connected with one end of a piston rod, and the piston rod extends out of the material bottle from the bottle wall of one side of the material bottle and is connected with a linear motion driving mechanism; and a filling pipe extending out of the second shell is arranged on the bottle wall of the other side of the material bottle. By means of the device, the repairing quality is improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering defect repair technology, specifically to a side-mounted follow-up laser-assisted milling processing device and its working method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] During long-term operation, tunnel linings are susceptible to damage from factors such as changes in surrounding rock conditions, construction disturbances, vehicle loads, water erosion, and temperature variations. These factors can lead to longitudinal, circumferential, diagonal, and network-like cracks. If these cracks continue to develop, they can further cause water leakage, lining spalling, steel reinforcement corrosion, and a decrease in localized load-bearing capacity. Tensile cracks, in particular, severely impact tunnel structure and operational safety.

[0004] Currently, tunnel lining crack repair mainly employs methods such as surface sealing, ordinary grouting, and grooved patching. Among these, while ordinary grouting is relatively convenient, it generally suffers from the following shortcomings: Before grouting, only the surface of the crack is typically treated, making it difficult to effectively remove floating dust, loose particles, and deteriorated deposits inside the crack, affecting the bonding quality between the repair material and the matrix; traditional pressure grouting has poor filling uniformity for narrow, bifurcated, and irregular cracks, easily leading to problems such as localized voids, incomplete filling, and a high rework rate; furthermore, grouting repair lacks quantitative diagnosis of the crack's severity and the necessity of repair, easily resulting in blind or insufficient repair. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a device and method for repairing tunnel lining cracks, which overcomes the defects existing in current tunnel lining repair.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a tunnel lining crack repair device, comprising: Grinding mechanism: used to grind and clean the inner wall of the crack, including a first housing, a first rotating drive is provided inside the first housing, the output shaft of the first rotating drive passes through the grinding end shell wall of the first housing and is connected to a grinding drill bit, the part of the output shaft of the first rotating drive located inside the first housing is provided with multiple fan blades in the circumferential direction, and the grinding end shell wall of the first housing is provided with multiple air outlets. Filling mechanism: Used to fill and repair cracks after the inner wall has been cleaned by the grinding mechanism. It includes a second housing, inside which is a material bottle. Inside the material bottle is a piston. One end of the piston is connected to a piston rod. The piston rod extends from one side of the material bottle wall to the outside of the material bottle and is connected to a linear motion drive mechanism. The other side of the material bottle wall is provided with a filling tube extending to the outside of the second housing.

[0007] Optionally, an ultrasonic vibrator is also included to apply ultrasonic vibration to the lining around the crack when filling the repair material.

[0008] Optionally, the outer surface of the grinding drill bit has multiple protrusions.

[0009] Optionally, the grinding end shell wall of the first housing is provided with an opening for the output shaft of the first rotating drive to pass through, and multiple air outlets are evenly distributed around the opening along the circumferential direction of the grinding end shell wall.

[0010] Optionally, the linear motion drive mechanism includes a second rotary drive member disposed inside the second housing. The output shaft of the second rotary drive member is connected to a lead screw, the lead screw is connected to a piston rod, and the piston rod is slidably connected to the second housing.

[0011] Optionally, it also includes a power supply mechanism, which includes a third housing that can be detachably and fixedly connected to the first housing and the second housing. The power supply mechanism has a power source inside, which is connected to a power supply line. The power supply line is connected to a plug. Correspondingly, the power supply line of the first rotation drive is connected to a first socket located in the first housing and matching the plug, and the power supply line of the second rotation drive is connected to a second socket located in the second housing and matching the plug.

[0012] Secondly, embodiments of the present invention provide a method for repairing cracks in tunnel lining, using the tunnel lining crack repair device described in the first aspect, comprising the following steps: Obtain the crack bearing capacity coefficient of the cracks in the lining, and identify the cracks that need to be repaired based on the crack bearing capacity coefficient. The grinding drill bit of the grinding mechanism is inserted into the crack to be repaired. The first rotating drive unit drives the grinding drill bit to rotate. The grinding drill bit moves along the extension direction of the crack and grinds the inner wall of the crack. At the same time, multiple fan blades rotate, and the airflow generated enters the crack through the air outlet. The wind force is used to discharge the dust and debris generated during the grinding process to the outside of the crack. After the crack is polished, the filling tube is inserted into the crack and the crack is filled in layers from the inside out. During filling, the linear motion drive mechanism drives the piston to squeeze the repair material in the bottle into the filling tube and output it into the crack to fill the crack.

[0013] Optionally, the crack bearing capacity coefficient can be obtained as follows: Obtain the length, depth, orientation, and fractal dimension of multiple cracks on the lining surface; The crack bearing capacity coefficient is obtained by combining the crack length, depth, orientation, fractal dimension of the crack, and corresponding fitting coefficients with the fractal dimension of the crack.

[0014] Optionally, cracks with a bearing capacity lower than a preset threshold are selected for repair, while the remaining cracks are simply recorded and marked for subsequent observation.

[0015] Optionally, when filling the crack, the vibration application head of the ultrasonic vibrator is placed against a set position around the crack and ultrasonic vibration is applied to the lining.

[0016] The beneficial effects of this invention are as follows: 1. The tunnel lining crack repair device and method of the present invention are provided with a grinding mechanism and a filling mechanism. When repairing cracks, the grinding mechanism is used first to grind the cracks, and then the filling mechanism is used to fill the cracks with repair material. The first rotating drive component of the grinding mechanism can drive the fan blade and the grinding drill bit to rotate. The grinding drill bit can extend into the crack to grind the inner wall of the crack. At the same time, the airflow generated by the fan blade can enter the crack through the air outlet to discharge the dust, debris, loose particles and deteriorated adhering layer generated by grinding in a timely manner, so that a clean, stable matrix interface that is conducive to the bonding of the repair material is formed inside the crack, thereby improving the bonding quality and tensile strength between the repair material and the lining matrix at the crack repair location.

[0017] 2. The tunnel lining crack repair device and method of the present invention are equipped with an ultrasonic vibrator. When the crack is being filled, ultrasonic vibration can be applied to the lining part around the crack. Through the advancement of the piston and the compaction effect of ultrasonic vibration, the uniformity of diffusion and compaction of the repair material in the complex crack is improved, the probability of local voids and incomplete filling is reduced, and the rework rate is reduced.

[0018] 3. The tunnel lining crack repair device and repair method of the present invention determine the cracks that need to be repaired based on the crack bearing capacity coefficient, realize the quantitative diagnosis of the necessity of crack repair, avoid the blindness of repairing cracks as soon as they are found in traditional methods, and improve the scientific nature of repair decision-making. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is a schematic diagram of the grinding mechanism in Embodiment 1 of the present invention; Figure 2This is a schematic diagram of the filling mechanism in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the assembly of the grinding mechanism and the power supply mechanism in Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the assembly of the filling mechanism and the power supply mechanism in Embodiment 2 of the present invention; Among them, 1. First housing, 2. First motor, 3. Grinding drill bit, 4. Fan blade, 5. Air outlet, 6. Second housing, 7. Second motor, 8. Spacer block, 9. Material bottle, 10. Piston rod, 11. Lead screw, 12. Filling tube, 13. Third housing, 14. Stud, 15. Switch, 16. Power supply circuit. Detailed Implementation

[0021] Example 1 This embodiment provides a tunnel lining crack repair device, including a grinding mechanism, a filling mechanism, and a power supply mechanism used in conjunction. The power supply mechanism can be detachably connected to the grinding mechanism and the filling mechanism. When the power supply mechanism is connected to the grinding mechanism, it is used to supply power to the grinding mechanism. The grinding mechanism is used to grind and clean the inner wall of the crack to be repaired, removing floating dust, loose particles, and deteriorated adhering layers inside the crack. After grinding is completed, the grinding mechanism is detached from the power supply mechanism, and the power supply mechanism is connected to the filling mechanism to supply power to the filling mechanism. The filling mechanism is used to fill the inside of the crack with repair material.

[0022] like Figure 1 As shown, the grinding mechanism includes a first housing 1, which is a cylindrical housing. In this embodiment, the shell wall of the first housing 1 near the lining is defined as the grinding end shell wall during use.

[0023] A first rotating drive component is fixed inside the first housing 1. In this embodiment, the first rotating drive component is a first motor 2. The first motor 2 is coaxially fixed inside the first housing 1, and its output shaft passes through the grinding end housing wall and extends to the outside of the first housing 1.

[0024] Preferably, the outer diameter of the first motor 2 is smaller than the inner diameter of the first housing 1. The first motor 2 is fixed inside the first housing 1 by a bracket. Correspondingly, the housing wall opposite the grinding end is provided with multiple through holes as ventilation and heat dissipation holes.

[0025] The end of the output shaft of the first motor 2 that extends outside the first housing is fixedly connected to one end of the grinding drill bit 3, and the first motor 2 can drive the grinding drill bit 3 to rotate.

[0026] In this embodiment, the grinding drill bit 3 includes a cylindrical section. One end of the cylindrical section is integrally connected to the larger end of the conical tip section. The other end of the cylindrical section is provided with a connector. The connector is sleeved on the outer circumference of the output shaft of the first motor 2 and fixed to the output shaft of the first motor 2 by threaded connection or welding.

[0027] Both the cylindrical section and the conical tip section have multiple protrusions on their outer circumferential surfaces. Specifically, there are multiple sets of protrusions along the axial direction of the cylindrical section and the conical tip section. These sets of protrusions are evenly spaced, and each set has multiple protrusions evenly spaced along the circumferential direction of the grinding drill bit.

[0028] The output shaft of the first motor 2 is located inside the first housing 1, and a plurality of fan blades 4 are arranged at equal intervals along the circumferential direction to form a fan structure. When the output shaft of the first motor 2 drives the plurality of fan blades 4 to rotate, it can generate airflow toward the lining direction.

[0029] The closed end shell wall of the first housing 1 is provided with multiple air outlets 5 for the fan blades 4 to generate airflow.

[0030] Specifically: the closed end shell wall is provided with an opening for the output shaft of the first motor 2 to pass through, the output shaft is rotatably connected to the opening and a sealing ring is provided between the output shaft and the hole surface of the opening.

[0031] Multiple air outlets 5 are located around the opening and are evenly distributed along the circumferential direction of the polished end shell wall.

[0032] like Figure 2 As shown, the filling mechanism includes a second housing 6, which is a cylindrical housing. A spacer block 8 is provided inside the second housing 6 to divide the second housing 6 into a first chamber and a second chamber. In use, the second chamber is located close to the lining.

[0033] The first chamber is equipped with a second rotation drive component, which is a second motor 7. The diameter of the housing of the second motor 7 is smaller than the diameter of the first chamber. The second motor 7 is fixed inside the first chamber by a bracket.

[0034] The second chamber is coaxially equipped with a material bottle 9, which is fixed inside the second chamber by a bracket.

[0035] The material bottle 9 is equipped with a piston, which is slidably connected to the material bottle 9. The piston can move linearly along the axis of the material bottle 9 inside the material bottle 9. The piston divides the space inside the material bottle 9 into a first space and a second space. The second space is located close to the lining when in use and is used to put in the repair material.

[0036] The material bottle is also provided with a filling port corresponding to the second space. A sealing plug is threaded to the filling port. The filling port is used to add repair material into the material bottle. Correspondingly, the shell wall of the second housing 6 is provided with an opening corresponding to the position of the filling port.

[0037] The piston is connected to one end of the piston rod 10, the piston rod 10 is located in the first space, and the other end of the piston rod 10 extends to the outside of the material bottle 9.

[0038] In this embodiment, the piston rod 10 extends into the sliding channel provided in the spacer block 8 and is slidably connected with the sliding channel, thereby realizing the sliding connection between the piston rod 10 and the second housing 6.

[0039] The piston rod 10 is connected to a linear motion drive mechanism, which drives the piston rod 10 to move linearly along the axis of the second housing 6.

[0040] In this embodiment, the linear motion drive mechanism includes a second motor 7 fixed inside the first chamber. The output shaft of the second motor 7 is fixedly connected to one end of the lead screw 11, and the lead screw 11 is threadedly connected to the piston rod 10.

[0041] To prevent the piston rod 10 from rotating around its own axis, the cross-section of the piston rod 10 is polygonal, and correspondingly, the sliding channel is a polygonal channel that matches the piston rod.

[0042] Preferably, the cross-section of the piston rod 10 is a regular quadrilateral shape, and correspondingly, the polygonal channel is a regular quadrilateral channel.

[0043] The second space of the material bottle 9 is connected to one end of the filling tube 12, and the material bottle 9 and the filling tube 12 are coaxially arranged. The filling tube 12 passes through the second housing 6 and extends to the outside of the second housing 6.

[0044] The filling tube 12 also includes a cylindrical section and a conical section. One end of the cylindrical section is integrally fixed to the larger end of the conical section, and the other end is provided with a connector, which is fixedly connected to the outlet of the material bottle 9.

[0045] In the filling mechanism of this embodiment, the second motor 7 drives the lead screw 11 to rotate, and the piston rod 10 can drive the piston to move toward the filling tube 12. The piston squeezes the repair material in the second space into the filling tube 12, and the repair material finally flows out from the tip of the conical section of the filling tube 12.

[0046] The power supply mechanism includes a third housing 13, which is a cylindrical housing. One end of the third housing 13 can be detachably and fixedly connected to one end of the cylindrical surface of the first housing 1 and the second housing 6, so that the power supply mechanism can form an L-shaped structure after being connected to the grinding mechanism or the filling mechanism, which is convenient for repair personnel to hold.

[0047] The top of the third housing 13 can be detachably and fixedly connected to one end of the first housing 1 and the second housing 6. Specifically: A bolt or stud 14 is fixed to the top of the third housing 13. Correspondingly, the ends of the first housing 1 and the second housing 6 are provided with threaded holes 15 that match the bolt or stud 14.

[0048] In another embodiment, the ends of the first housing 1 and the second housing 6 are provided with through holes that match the bolts or studs 14, and nuts are welded and fixed at the through holes, and the nuts can be threadedly fixed to the bolts or studs 14.

[0049] The third housing 13 is equipped with a power source, which can be a battery, and will not be described in detail here. The battery is connected to the power supply circuit 16. The power supply circuit 16 is equipped with a switch 15 located in the third housing 13. The switch 15 is used to control the power supply circuit 16 to turn on and off.

[0050] The power supply circuit 16 of the battery lock is connected to a plug located outside the third housing 13. Correspondingly, the power supply line of the first motor 2 is connected to the first socket located in the first housing 1 and matched with the plug, and the power supply line of the second motor 7 is connected to the second socket located in the second housing 6 and matched with the plug.

[0051] The plug and socket can be made using existing technology, and their specific structure will not be described in detail here.

[0052] The tunnel lining crack repair device in this embodiment also includes an ultrasonic vibrator. In use, the vibration application probe of the ultrasonic vibrator is attached to a set position around the lining of the crack to be repaired to apply ultrasonic vibration to the lining.

[0053] The ultrasonic vibrator can be made using existing equipment, and its specific structure will not be described in detail here.

[0054] Example 2 This embodiment provides a method for repairing cracks in tunnel lining, using the tunnel lining crack repair device described in Embodiment 1, and specifically includes the following steps: Step 1: Obtain the crack bearing capacity coefficient of the cracks in the lining, and identify the cracks that need to be repaired based on the crack bearing capacity coefficient.

[0055] Specifically: First, the cracks to be treated in the lining of the operating tunnel are detected and parameters are extracted to obtain the crack length, crack depth, crack direction and crack fractal dimension.

[0056] In this embodiment, specialized tools are used to detect the crack length, depth, and direction, and a fractal dimension calculation tool is used to calculate the fractal dimension D of the crack.

[0057] The methods for obtaining crack length, depth, orientation, and fractal dimension can be found using existing technologies and will not be described in detail here.

[0058] The crack bearing capacity coefficient is obtained based on the crack length, depth, orientation, fractal dimension, and corresponding fitting coefficients.

[0059] The crack bearing capacity coefficient is used to characterize the degree to which cracks weaken the local bearing capacity of the lining, and its calculation formula is as follows:

[0060] in, B c The crack bearing capacity coefficient is... C l For crack length, C φ For the direction of the crack, C h This represents the crack depth. a , b , c , d , e These are the corresponding fitting coefficients, which are functional expressions constructed by combining crack length, crack depth, crack orientation, and crack fractal dimension as variables.

[0061] The crack length characterizes the extent of the crack's extension along the lining surface; the crack depth characterizes the crack's initiation depth; the crack orientation characterizes the angle between the crack and the tunnel's longitudinal axis or the main stress direction; and the fractal dimension characterizes the complexity, tortuosity, or network-like nature of the crack's branches. By coupling these variables, the original crack assessment method, which relied on manual experience, can be transformed into a hazard rating method based on parameter calculations.

[0062] The fitting coefficients in the calculation formula are determined by a combination of indoor model tests, full-scale tests, and numerical simulations. Specifically, loading tests are conducted on crack specimens with different lengths, widths, orientations, and spatial distributions to obtain the attenuation law of the lining bearing capacity under crack conditions. At the same time, a corresponding numerical model is constructed to establish the response relationship between crack geometric parameters and bearing capacity. Then, regression fitting or inversion methods are used to determine the undetermined fitting coefficients in the formula. This method is applicable to the evaluation of all cracks in similar projects. The above methods can be achieved using existing technologies and will not be described in detail here.

[0063] By substituting the actual measured crack length, depth, orientation, and fractal dimension coefficient into the crack bearing capacity coefficient calculation formula, the crack bearing capacity coefficient for different cracks is obtained, and the crack hazard level is classified accordingly. The lower the bearing capacity coefficient, the more significant the weakening of the lining's load-bearing capacity by the crack, and the higher the repair priority.

[0064] In this embodiment, cracks are classified into slightly hazardous cracks, moderately hazardous cracks, and severely hazardous cracks based on their load-bearing capacity coefficient. Slightly hazardous cracks can be recorded and observed only, while moderately and severely hazardous cracks are prioritized for repair in subsequent construction processes. This method transforms crack repair from experience-based judgment to decision-making based on the quantified results of load-bearing capacity impact.

[0065] Specifically: Cracks with a bearing capacity lower than a preset threshold are selected for repair, while the remaining cracks are simply recorded and marked for subsequent observation.

[0066] Step 2: Delineate the construction area for the cracks to be repaired, clean the impurities attached to the crack surface, and determine the front-end operation path of the tunnel lining crack repair device according to the crack direction.

[0067] This step can be accomplished using existing technology and will not be described in detail here.

[0068] Step 3: Grind and clean the inner wall of the crack.

[0069] Specifically, such as Figure 3 As shown, the first housing 1 and the third housing 13 are fixedly connected, and the plug of the power supply circuit 16 connected to the battery is plugged into the socket connected to the power supply line of the first motor 2.

[0070] The grinding drill bit 3 is inserted into the crack, and the repair personnel turn on the switch 15. The first motor 2 drives the grinding drill bit 3 to rotate. At the same time, the output shaft of the first motor 2 drives the fan blade 4 to rotate, generating airflow toward the tunnel lining.

[0071] The repair personnel hold the third housing 13 and drive the grinding drill bit 3 to move along the extension direction of the crack. The grinding drill bit 3 rotates to perform directional grinding and friction cleaning on the inner wall and opening area of ​​the crack. At the same time, the air outlet 5 on the grinding end housing wall sprays high-pressure gas to promptly remove the dust, debris, loose particles and deteriorated adhering layer generated by grinding, so that a clean, stable matrix interface that is conducive to the bonding of repair materials is formed inside the crack.

[0072] The above steps can significantly improve the quality of internal crack cleaning, providing a good interface for subsequent filling.

[0073] Step 4: Fill and repair the cracks.

[0074] Separate the plug of the power supply circuit 16 connected to the battery from the socket connected to the power supply line of the first motor 2, and separate the first housing 1 and the third housing 13, as follows. Figure 4 As shown, the second housing 6 and the third housing 13 are fixed, and the plug of the power supply circuit 16 connected to the battery is plugged into the socket connected to the power supply line of the second motor 7.

[0075] Place the vibration head of the ultrasonic vibrator against the periphery of the crack at the designated position. The position can be set according to actual needs and will not be described in detail here.

[0076] Insert the filling tube 12 into the bottom of the crack, start the ultrasonic vibrator, and the second motor 7 will work to drive the piston in the material bottle 9 to move. The piston squeezes the repair material and the repair material is sent out through the filling tube 12. The repair personnel drive the filling tube 12 to walk along the direction of the crack extension and fill the bottom of the crack. Using the same method, the crack is filled in layers from the inside to the outside until the crack is completely filled.

[0077] An ultrasonic vibrator applies sound waves or vibrations to promote the uniform diffusion of repair materials within cracks, eliminate trapped air bubbles, and improve the density of the filling.

[0078] Step 5: Curing and Post-Repair Evaluation After the repair material has cured, the repaired area is visually inspected, and evaluations of its impermeability, filling density, interfacial bonding performance, and local mechanical recovery effect are conducted as needed to form a repair quality result.

[0079] Specifically: After the repair material has cured, the surface quality of the repaired area is inspected, and impermeability testing, filling density testing, interface bonding performance testing, and local mechanical recovery evaluation are carried out as needed. For cracks that have been repaired and are completely filled, have stable bonding, and whose performance recovery meets the requirements, the repair is completed; for cracks whose repair effect does not meet the requirements, steps 3 and 4 can be repeated for supplementary repair.

[0080] This step can be accomplished using existing technology and will not be described in detail here.

[0081] The repair device and method of this embodiment first utilize a grinding mechanism for grinding, and then a filling mechanism to fill the crack with repair material. The first motor 2 of the grinding mechanism drives the fan blade 4 and the grinding drill bit 3 to rotate. The grinding drill bit 3 can extend into the crack to grind the inner wall of the crack. At the same time, the airflow generated by the fan blade 4 can enter the crack through the air outlet 5, timely expelling the dust, debris, loose particles, and deteriorated adhering layer generated by grinding. This creates a clean, stable matrix interface inside the crack that is conducive to the bonding of the repair material, improving the bonding quality and tensile strength between the repair material and the lining matrix at the crack location. During crack filling, an ultrasonic vibrator applies ultrasonic vibration to the lining around the crack. Through the piston's advancement and the compaction effect of ultrasonic vibration, the uniformity of diffusion and filling density of the repair material inside the complex crack are improved, reducing the probability of local voids and incomplete filling, and lowering the rework rate.

[0082] At the same time, the method determines which cracks need to be repaired based on the crack bearing capacity, rather than repairing all cracks. This enables a quantitative diagnosis of the necessity of crack repair, avoids the blind approach of repairing any cracks found in traditional methods, and improves the scientific nature of repair decisions.

[0083] The repair device and method of this embodiment take into account crack sealing, seepage prevention and leakage prevention, and local performance restoration, and are suitable for rapid repair of narrow cracks, bifurcated cracks and irregular cracks in tunnel lining.

[0084] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for repairing cracks in tunnel lining, characterized in that, include: Grinding mechanism: used to grind and clean the inner wall of the crack, including a first housing, a first rotating drive is provided inside the first housing, the output shaft of the first rotating drive passes through the grinding end shell wall of the first housing and is connected to a grinding drill bit, the part of the output shaft of the first rotating drive located inside the first housing is provided with multiple fan blades in the circumferential direction, and the grinding end shell wall of the first housing is provided with multiple air outlets. Filling mechanism: Used to fill and repair cracks after the inner wall has been cleaned by the grinding mechanism. It includes a second housing, inside which is a material bottle. Inside the material bottle is a piston. One end of the piston is connected to a piston rod. The piston rod extends from one side of the material bottle wall to the outside of the material bottle and is connected to a linear motion drive mechanism. The other side of the material bottle wall is provided with a filling tube extending to the outside of the second housing.

2. The tunnel lining crack repair device as described in claim 1, characterized in that, It also includes an ultrasonic vibrator, used to apply ultrasonic vibration to the lining around the crack when filling repair material.

3. The tunnel lining crack repair device as described in claim 1, characterized in that, The outer side of the grinding drill bit has multiple protrusions.

4. The tunnel lining crack repair device as described in claim 1, characterized in that, The grinding end shell wall of the first housing is provided with an opening for the output shaft of the first rotating drive to pass through, and multiple air outlets are evenly distributed around the opening along the circumferential direction of the grinding end shell wall.

5. The tunnel lining crack repair device as described in claim 1, characterized in that, The linear motion drive mechanism includes a second rotary drive component disposed inside the second housing. The output shaft of the second rotary drive component is connected to a lead screw, the lead screw is connected to a piston rod, and the piston rod is slidably connected to the second housing.

6. The tunnel lining crack repair device as described in claim 1, characterized in that, It also includes a power supply mechanism, which includes a third housing that can be detachably and fixedly connected to the first housing and the second housing. The power supply mechanism has a power source inside, which is connected to a power supply line. The power supply line is connected to a plug. Correspondingly, the power supply line of the first rotating drive member is connected to a first socket located in the first housing and matching the plug, and the power supply line of the second rotating drive member is connected to a second socket located in the second housing and matching the plug.

7. A method for repairing cracks in tunnel lining, characterized in that, The tunnel lining crack repair device according to any one of claims 1-6 is used, comprising the following steps: Obtain the crack bearing capacity coefficient of the cracks in the lining, and identify the cracks that need to be repaired based on the crack bearing capacity coefficient. The grinding drill bit of the grinding mechanism is inserted into the crack to be repaired. The first rotating drive unit drives the grinding drill bit to rotate. The grinding drill bit moves along the extension direction of the crack and grinds the inner wall of the crack. At the same time, multiple fan blades rotate, and the airflow generated enters the crack through the air outlet. The wind force is used to discharge the dust and debris generated during the grinding process to the outside of the crack. After the crack is polished, the filling tube is inserted into the crack and the crack is filled in layers from the inside out. During filling, the linear motion drive mechanism drives the piston to squeeze the repair material in the bottle into the filling tube and output it into the crack to fill the crack.

8. The method for repairing tunnel lining cracks as described in claim 7, characterized in that, The method for obtaining the crack bearing capacity coefficient is as follows: Obtain the length, depth, orientation, and fractal dimension of multiple cracks on the lining surface; The crack bearing capacity coefficient is obtained by combining the crack length, depth, orientation, fractal dimension of the crack, and corresponding fitting coefficients with the fractal dimension of the crack.

9. The method for repairing tunnel lining cracks as described in claim 7, characterized in that, Cracks with a bearing capacity lower than a preset threshold are selected for repair, while the remaining cracks are simply recorded and marked for subsequent observation.

10. The method for repairing tunnel lining cracks as described in claim 7, characterized in that, When filling the crack, the vibration application head of the ultrasonic vibrator is placed against a set position around the crack and ultrasonic vibration is applied to the lining.

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