Tunnel crack injection repair method for tunnel engineering

Abstract

The present invention provides a tunnel crack injection repair method for tunnel engineering, which uses a grinding and crack cleaning machine to perform grinding and crack cleaning operations, drives a mobile lifting module to the bottom of the tunnel crack, and uses a lifting bracket to raise the grinding and crack cleaning module to a suitable position from the crack surface wall until the grinding disc and the protective cover are tightly fitted with the crack surface wall, and smoothly performs grinding, crack cleaning and dust collection operations. The position of the lower end mobile lifting module is adjusted at any time according to the direction of the crack, and then subsequent pressure testing and grouting operations are performed. Compared with traditional methods, this technical solution drills grouting holes at an angle, and during the grouting operation, the structural adhesive can directly enter the deepest part of the gap, making the inside of the gap full and rich, without air, meeting the design construction requirements and acceptance standards, and reducing the probability of subsequent rework, thereby extending the service life of the tunnel.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel crack repair, and in particular to a tunnel crack injection repair method used in tunnel engineering. Background Art

[0002] Due to the corrosive effects of alternating dry and wet conditions, sunlight exposure, freeze-thaw, and humid air, a porous corrosion surface gradually forms on the surface of the tunnel concrete. The corrosive medium further penetrates into the concrete through the tiny gaps on the concrete surface, causing the steel bars inside the reinforced concrete structure to rust, which in turn leads to cracks in the tunnel lining and water leakage.

[0003] At present, there are several ways to deal with tunnel cracking and leakage:

[0004] (1) Surface sealing method

[0005] The surface sealing method is used to treat the entire section of the widened lining of the main tunnel. The lining surface is coated with cement-based penetrating crystalline waterproof coating and polymer cement waterproof mortar.

[0006] (2) Injection method

[0007] For cracks with a width of w>0.2mm, the injection method is used to treat them. Acrylate slurry is injected into the crack cavity with a certain pressure to seal and stop the cracks.

[0008] (3) Lowering the water level

[0009] Drain holes are constructed on the side walls on both sides of the widened area, and trenches are dug to bury pipes to divert groundwater in the surrounding rock to the cable trench to lower the groundwater level in the main tunnel.

[0010] (4) Water diversion method

[0011] Dig grooves at the widened construction joints and bury stainless steel water boxes to drain the leaking water into the cable trench.

[0012] Of the above repair methods, only the injection method is suitable for crack seepage in tunnel roofs. However, when using the crack injection method, because the crack top is high above the ground, the traditional construction method requires workers to manually operate on a lift. First, they grind the crack edge along the direction of the crack, and then use a blower to blow away dust and other debris outside and inside the crack, and keep it dry. After completing the pretreatment, the formal grouting operation can be carried out. This method is inefficient and produces a lot of dust, polluting the on-site environment. Workers work at high altitudes, and the construction workers have to look up and lift their arms, which consumes a lot of physical energy. Once distracted, safety issues are very likely to occur.

[0013] In addition, the traditional method is generally to install a glue injection tube directly below the crack, insert the tube head of the glue injection tube into the crack, expose the tank body, and then inject glue into the crack. This method has many problems. First, the air in the crack is not completely eliminated, and the structural glue cannot fill the crack, which will become the source of the crack reopening, and subsequent treatment will still require multiple times and will be more cumbersome; second, direct vertical glue injection, the structural glue cannot reach the deepest part of the crack, that is, there are still gaps in the crack that are not filled, which will also cause the above problems. In summary, the existing crack injection repair method is not scientific enough. On the one hand, the construction is difficult and the efficiency is low. On the other hand, the construction effect is difficult to guarantee for a long time, and rework is frequent. Here, a tunnel crack injection repair method is proposed to overcome the above problems. Summary of the Invention

[0014] The purpose of the present invention is to provide a tunnel crack injection repair method for tunnel engineering, which solves the problems of low crack cleaning efficiency, high manpower participation, inaccurate crack filling, delayed construction progress, and laxity in various processes during the construction process in existing tunnel crack injection repair methods.

[0015] The embodiment of the present invention is implemented by the following technical solution: a tunnel crack injection repair method for tunnel engineering, comprising the following steps:

[0016] S1. Determine the direction and depth of the cracks and record the degree of water seepage;

[0017] S2. Drill grouting holes obliquely on both sides of the crack along its direction and place grouting nozzles. The depth of the grouting holes should reach the deepest part of the crack.

[0018] S3. Use the grinding and seam cleaning machine to perform grinding and seam cleaning operations, drive the mobile lifting module to the bottom of the tunnel crack, and raise the grinding and seam cleaning module to a suitable position from the crack surface wall through the lifting bracket. The grinding and seam cleaning module is provided with a dust suction component, a grinding component and an air blowing component from front to back. The end where the dust suction component is arranged is defined as the front end, and the opposite end is defined as the rear end. The grinding and seam cleaning module moves forward along the cracking trajectory of the crack. During the process, the gaps between the dust suction component, the grinding component and the air blowing component and the crack surface wall are adjusted by the climbing motor and the cylinder until the grinding disc and the guard cover are tightly fitted with the crack surface wall, and the grinding, seam cleaning and dust suction operations are carried out smoothly, and the position of the lower end mobile lifting module is adjusted at any time according to the direction of the crack;

[0019] S4. After the grinding and cleaning work is completed, the grinding and cleaning module is disassembled and the construction workers move to the lifting platform. The lifting platform is surrounded by fences. The construction workers then raise the platform and use crack sealing glue to seal the crack surface wall and the gap between the grouting hole and the grouting nozzle. The exhaust nozzle is inserted along the direction of the crack and temporarily closed. Oil-free compressed air is input into the crack through the grouting nozzle. Soapy water is applied near the crack to check for leaks. During this process, the mobile lifting module moves steadily and slowly along the direction of the crack to ensure construction safety.

[0020] S5. After ensuring that the cracks are closed, inject structural adhesive into the cracks through the grouting nozzle until the exhaust nozzle exhausts the adhesive one by one, and then close the exhaust nozzle;

[0021] S6. When the structural adhesive in the crack is initially solidified and does not flow out, the exhaust nozzle and grouting nozzle can be removed, and then the crack is smoothed and sealed with sealant;

[0022] S7. Observe the cracks to see if there is any water seepage. After passing the inspection, clean and paint the crack surface, and the tunnel can be opened to traffic.

[0023] Furthermore, in step S2, the horizontal distance between the grouting hole and the crack is between 10-25 cm, and the inclination angle between the grouting hole and the tunnel wall is between 45°-60°.

[0024] Furthermore, in step S3, the grinding and seam cleaning module includes a base at the bottom and a top plate at the top, a climbing rod is vertically arranged at the rear end of the base, a climbing motor is provided in the middle of the base, the output end of the climbing motor faces upward and is connected to a screw, the screw and the climbing rod are connected by a climbing frame, the cross-section of the climbing frame is a U-shaped structure, one end of the climbing frame is threadedly connected to the screw, and the other end of the climbing frame is slidably connected to the climbing rod.

[0025] Furthermore, a suspension rod is vertically provided on the lower end face of the climbing frame, and a cylinder is horizontally provided on the side wall of the suspension rod facing the dust suction component. The output end of the cylinder extends horizontally and is rotatably connected to one end of the rotating rod. The rod body of the rotating rod extends upward and intersects with the end of the cantilever of the climbing frame. The two are movably connected at the intersection, and the other end of the rotating rod is rotatably connected to the rotating seat on the bottom surface of the top plate.

[0026] Furthermore, a limit rod is provided at the rotation connection between the rotating rod and the rotating seat to limit the rotation angle of the rotating seat.

[0027] Furthermore, multiple grinding motors are provided on the bottom surface of the top plate, the output ends of the grinding motors pass through the top plate upward and are connected to the grinding disc, a dust suction fan and a dust collection box are arranged in the dust suction component, the protective cover is made of elastic material, and the protective cover is arranged along the top edge of the top plate, and a through-type dust suction port is also opened at the position of the top plate corresponding to the dust suction component.

[0028] Furthermore, the air blowing assembly blows air upwards through the air blowing port, the air blowing port is arranged obliquely, and the opening end thereof is inclined and extends toward the front end.

[0029] Furthermore, in step S4, when the oil-free compressed air pressure in the crack reaches 0.5 MPa, if there are still blocked grouting nozzles, the grouting nozzles should be re-buried and the spacing between them should be shortened.

[0030] Furthermore, in step S5, the grouting is carried out in a low-pressure slow injection manner, the grouting pressure is preferably 0.1-0.3 MPa, and the grouting slurry material is acrylate slurry.

[0031] Furthermore, when working on circumferential and oblique cracks, grouting operations should be carried out from bottom to top.

[0032] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0033] 1. Compared with traditional methods, this technical solution significantly improves the efficiency of seam cleaning by using a grinding and seam cleaning machine, reducing the time construction workers spend working at height. At the same time, the grinding and seam cleaning machine also adds a dust collection component to optimize the construction environment in the tunnel;

[0034] 2. After the grinding and cleaning work is completed, the grinding and cleaning module of the grinding and cleaning machine in this technical solution can be disassembled, and the fence around the lifting plate can be raised. Construction workers can stand on the lifting plate to carry out subsequent pressure testing and grouting operations. One machine can be used for multiple purposes, reducing costs;

[0035] 3. Compared with the traditional method, this technical solution uses inclined drilling of grouting holes. During the grouting operation, the structural adhesive can directly enter the deepest part of the gap, making the inside of the gap full and free of air, meeting the design construction requirements and acceptance standards, reducing the chance of subsequent rework, and extending the service life of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A construction flow chart of the tunnel crack injection repair method for tunnel engineering provided by the present invention;

[0038] Figure 2 This is a construction plan of crack drilling and grouting in the present invention;

[0039] Figure 3 for Figure 2 Cross-section at AA;

[0040] Figure 4 A schematic diagram of the overall structure of a grinding and crack cleaning machine used in the tunnel crack injection repair method for tunnel engineering provided by the present invention;

[0041] Figure 5 A side view of the grinding and seam cleaning module of the present invention;

[0042] Figure 6 This is a cross-sectional view of the grinding and seam cleaning module of the present invention;

[0043] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0044] Figure 8 Schematic diagram of the three-dimensional structure of the grinding and seam cleaning module in the present invention;

[0045] Figure 9 Schematic diagram of the three-dimensional structure of the climbing frame of the present invention;

[0046] Figure 10 A top view of the climbing frame of the present invention;

[0047] Figure 11 This is a three-dimensional view from an upward angle of the grinding and seam cleaning module of the present invention;

[0048] Figure 12 for Figure 11 A partial enlarged view of point C in the middle.

[0049] Icons: 1. Mobile lifting module; 11. Base; 12. Lifting bracket; 13. Lifting plate; 2. Base; 21. Positioning hole; 22. Climbing rod; 221. Plug; 23. Climbing motor; 24. Screw; 3. Climbing frame; 31. Connecting rod; 32. Slide; 33. Rotating groove; 4. Hanging rod; 41. Cylinder; 42. Rotating rod; 421. Limiting rod; 5. Top plate; 51. Grinding motor; 52. Grinding disc; 53. Protective cover; 54. Dust suction port; 55. Rotating seat; 6. Dust suction component; 7. Blowing component; 71. Blowing port; 8. Exhaust nozzle; 9. Grouting hole; 91. Grouting nozzle. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0052] Example 1:

[0053] like Figure 1 As shown, the tunnel crack injection repair method used in tunnel engineering includes the following steps:

[0054] S1. Determine the direction and depth of the cracks and record the degree of water seepage.

[0055] S2, such as Figure 2 and Figure 3 As shown, along the direction of the crack, grouting holes 9 are drilled obliquely on both sides of the crack and grouting nozzles 91 are placed. The grouting holes 9 on both sides should be arranged crosswise. The horizontal distance between the grouting hole 9 and the crack is preferably between 10-25 cm. The inclination angle between the grouting hole 9 and the tunnel wall is between 45°-60°. Generally, a drill bit with a hole diameter of 20 mm is used. The depth of the grouting hole 9 should reach the deepest part of the crack to ensure that the subsequent structural adhesive can fully enter the crack.

[0056] The drill rod should be provided with a depth limiting device. The depth of the grouting nozzle 91 into the grouting hole 9 should not be greater than 1 / 2 of the length of the grouting hole 9. The spacing between adjacent grouting holes 9 is 300 mm.

[0057] S3, such as Figure 4 As shown, use a grinding and seam cleaning machine to perform grinding and seam cleaning operations:

[0058] The grinding and seam cleaning machine includes a lower mobile lifting module 1 and an upper grinding and seam cleaning module. The mobile lifting module 1 includes a movable base 11 at the bottom. The base 11 has rollers and can be pushed manually or driven by a motor. A lifting bracket 12 is fixedly connected to the top of the base 11, and a lifting plate 13 is horizontally placed on the top of the lifting bracket 12.

[0059] Drive the mobile lifting module 1 to the bottom of the tunnel crack, and use the lifting bracket 12 to raise the grinding and cleaning module to a suitable position from the crack wall.

[0060] like Figure 5 、 Figure 6 and Figure 7As shown, the grinding and seam cleaning module is provided with a dust suction component 6, a grinding component and an air blowing component 7 from front to back, and the three are integrated and arranged on the top plate 5 at the top. The grinding and seam cleaning module also includes a base 2 at the bottom end. The end where the dust suction component 6 is arranged is defined as the front end, and the opposite end is defined as the rear end. The grinding and seam cleaning module moves forward along the cracking trajectory of the crack to perform grinding, seam cleaning and dust suction operations. The construction site adjusts the position of the lower end movable lifting module 1 at any time according to the direction of the crack.

[0061] S4. After the grinding and cleaning operation is completed, the grinding and cleaning module is disassembled. Figure 5 and Figure 6 As shown, the base 2 is a boss structure, and positioning holes 21 are provided on all four sides of the base 2. The base 2 is connected to the lifting plate 13 by driving screws into the positioning holes 21. The grinding and cleaning module can be disassembled by unscrewing the screws. The construction workers walk on the lifting plate 13, and the lifting plate 13 is connected with a fence around it. Then the construction workers raise it and use crack sealing glue to seal the crack surface wall and the gap between the grouting hole 9 and the grouting nozzle 91, and insert the exhaust nozzle 8 along the direction of the crack. When the crack sealing glue hardens, the exhaust nozzle 8 is temporarily closed, and oil-free compressed air is input into the crack through the grouting nozzle 91. The pressure is equal to the injection pressure, and soapy water is applied near the crack to check for air leakage. During this process, the mobile lifting module 1 moves steadily and slowly along the direction of the crack to ensure construction safety.

[0062] After the grinding and cleaning operations are completed, the grinding and cleaning module of the grinding and cleaning machine in this technical solution can be disassembled, and a fence can be raised around the lifting plate 13. Construction workers can stand on the lifting plate 13 to perform subsequent pressure testing and grouting operations, so that one machine can be used for multiple purposes and reduce costs.

[0063] When the oil-free compressed air pressure in the crack reaches 0.5 MPa, if there is still a blocked grouting nozzle 91, the grouting nozzle 91 should be reburied and the spacing between them should be shortened. If leakage is found, it should be repaired with cement until no bubbles appear in the soapy water.

[0064] Before using crack sealing glue to seal the crack wall, scrub the crack wall with acetone reagent to increase the airtightness of the crack sealing glue.

[0065] S5. After ensuring that the crack is sealed, structural adhesive is injected into the crack through the grouting nozzle 91. The structural adhesive is Class A structural adhesive and complies with the relevant provisions of the "Technical Specifications for Highway Tunnel Reinforcement". 0.2 MPa oil-free compressed air is used as the power to slowly inject glue. Adjacent exhaust nozzles 8 exhaust glue one by one until the last exhaust nozzle 8 is exhausted. At this time, it is confirmed that the crack is sufficiently injected with glue. Then the exhaust nozzle 8 is closed. The purpose of opening the exhaust nozzle 8 before is to allow the structural adhesive to compress the air in the crack during the glue injection process and let it overflow from the opened exhaust nozzle 8, ensuring that there is no excess air in the crack and optimizing the glue injection quality. When the glue injection rate is less than 0.05 L / min, 0.3 MPa pressure is maintained for 5 minutes and then glue injection is stopped to ensure that the crack is fully injected with glue.

[0066] The grouting adopts the low-pressure slow injection method, the grouting pressure should be 0.1~0.3MPa, and the grouting slurry material is acrylate slurry. Before using the acrylate slurry, the appropriate slurry curing time should be determined through on-site mix ratio tests.

[0067] During the construction process, when working on circumferential and oblique cracks, grouting operations should be carried out from bottom to top to ensure that the structural adhesive in the cracks is filled from bottom to top and there is no air inside.

[0068] Compared with the traditional method, this technical solution drills the grouting holes 9 at an angle. During the grouting operation, the structural adhesive can directly enter the deepest part of the gap, and the inside of the gap is full and free of air, meeting the design construction requirements and acceptance standards, reducing the chance of subsequent rework, and extending the service life of the tunnel.

[0069] S6. When the structural adhesive in the crack is initially solidified and does not flow out, the exhaust nozzle 8 and the grouting nozzle 91 can be removed, and then the crack sealant or epoxy putty can be used to smooth and seal the crack.

[0070] S7. Observe the cracks to see if there is any water seepage. After passing the inspection, clean the crack surface and apply waterproof material. After the material solidifies, the tunnel can be opened to traffic.

[0071] The grinding and seam cleaning machine used in this technical solution is as follows: Figure 5 、 Figure 6 and Figure 7 As shown, the rear end of the base 2 is vertically fixed with a climbing rod 22, and the middle part of the base 2 is embedded with a climbing motor 23, the output end of the climbing motor 23 is upward and connected to a screw 24, as shown in FIG. Figure 8 、 Figure 9 and Figure 10As shown, the cross-section of the climbing frame 3 is a U-shaped structure, and a connecting rod 31 is laterally fixedly connected to the middle of the open end of the climbing frame 3, and a threaded ring structure is formed in the middle of the connecting rod 31. The ring structure is threadedly connected to the screw 24, and a slide groove 32 is provided at the closed end of the climbing frame 3. The slide groove 32 matches the shape of the climbing rod 22. The two are matching components. The slide groove 32 is slidably sleeved with the climbing rod 22. When the climbing motor 23 is started, its output end drives the screw 24 to rotate, and the climbing frame 3 moves up or down steadily and slowly under the action of the screw 24 and the climbing rod 22. Although the mobile lifting module 1 in the technical solution can drive the grinding and cleaning module to move up or down as a whole, its movement accuracy is low. When approaching the cracks at the top of the tunnel, it is necessary to fine-tune the distance between the grinding and cleaning module and the cracks to achieve better cleaning effects while avoiding damage to the equipment.

[0072] like Figure 5 As shown, a plug 221 is provided at the top of the climbing rod 22 to prevent the climbing frame 3 from being separated from the climbing rod 22 and the screw rod 24.

[0073] like Figure 5 and Figure 6 As shown, the lower end faces of the two cantilevers of the climbing frame 3 are vertically fixed with a hanger 4, and a cylinder 41 is horizontally arranged on one side wall of the hanger 4 facing the dust suction assembly 6. The output end of the cylinder 41 extends horizontally and is rotatably connected to one end of the rotating rod 42. The rod body of the rotating rod 42 extends upward and intersects with the end of the cantilever of the climbing frame 3. A rotating groove 33 is horizontally opened at the end of the cantilever of the climbing frame 3. The rotating groove 33 is a circular groove or a strip groove. The rod body of the rotating rod 42 is movably connected to the rotating groove 33 by an axle pin, and the other end of the rotating rod 42 is rotatably connected to the rotating seat 55 in the middle of the bottom surface of the top plate 5. By driving the output end of the cylinder 41 to extend and retract, the rotating rod 42 is rotated with the axle pin as the center of the circle, thereby changing the inclination angle and direction of the top plate 5. When the tunnel cracks at the curved surface, the top plate 5 can better fit the crack.

[0074] Similarly, since the climbing rod 22 is arranged at the rear end of the top plate 5, the top plate 5 is tilted and arranged at a forward position through the rotating rod 42. When the top plate 5 is in close contact with the crack, the structure is balanced in force and is reliable in use.

[0075] like Figure 11 and Figure 12As shown, the rotating rod 42 is two rod-shaped split structures set in a mirror image, and the rotating seat 55 is set in the middle position of the two rod-shaped split structures. Limit rods 421 are provided on both sides of the two rod-shaped split structures corresponding to the positions of the rotating seat 55. The smaller the distance between the limit rod 421 and the rotating seat 55, the smaller the rotation angle of the rotating seat 55. Since the two rotating seats 55 are located in the middle position of the bottom surface of the top plate 5, the rotatable angle of the top plate 5 is smaller. The purpose is to avoid the rotation angle of the top plate 5 being too large. For example, under the action of natural gravity, the top plate 5 and the base 2 are in a vertical state. Such a state is not conducive to the top plate 5 and the top wall of the tunnel. It can be selected according to the actual construction environment. The surface may be curved, sloped, etc. In order to better make the top plate 5 fit the tunnel top surface, it is very important to leave a distance between the limit rod 421 and the rotating seat 55. When the top plate 5 rises and supports the tunnel top surface, in the subsequent movement process, this distance can make the top plate 5 adaptively change its inclination angle and direction according to the specific situation of the tunnel top surface, so that the gap between the top plate 5 and the tunnel top surface is always relatively close, improving the effect of grinding and cleaning. When the top plate 5 moves to the large-radius curved surface of the tunnel, the cylinder 41 can be controlled to control the large-scale rotation of the entire top plate 5, thereby realizing the grinding and cleaning of the curved surface and vertical side wall cracks.

[0076] like Figure 7 and Figure 8 As shown, four grinding motors 51 are symmetrically fixed to the bottom surface of the top plate 5 about its center line. The output end of the grinding motor 51 passes through the top plate 5 upward and is connected to the grinding disc 52. After the grinding motor 51 is started, the grinding disc 52 rotates at high speed to clean the wall surface around the crack it contacts, reduce the adsorption of foreign matter, and is beneficial to the subsequent crack sealing and glue injection operations.

[0077] like Figure 7 and Figure 8As shown, the dust collection component 6 is arranged at the front end of the bottom of the top plate 5, and a dust collection fan and a dust collection box are arranged in the dust collection component 6. A protective cover 53 is arranged on the edge of the top surface of the top plate 5. The protective cover 53 is made of rubber or silicone material. A through-type dust collection port 54 is opened at the position of the top plate 5 corresponding to the dust collection component 6. When the grinding disc 52 rotates, the dust is sucked into the dust collection box by the dust collection fan in front through the dust collection port 54, and the protective cover 53 fits tightly against the top wall of the tunnel to reduce the degree of dust escape. The blowing component 7 is arranged at the rear end of the bottom surface of the top plate 5, and the blowing component 7 blows air upward through the blowing port 71, and the blowing port 71 is arranged obliquely, and its open end is inclined and extends to the front end, and the inclination angle is between 45°-65°. The advantage of such an arrangement is The blowing component 7 blows air forward at an angle, and the dust inside the gap and on the top wall of the tunnel floats forward. A dust suction component 6 is arranged in front of the top plate 5, which can properly and completely absorb the dust floating forward. The positions of each component are appropriately set, which conforms to the actual situation in production. Construction workers can complete the cleaning and grinding of the cracks on the top of the tunnel without high-altitude operations. In the traditional method, the grinding and cleaning operations are carried out separately. The construction workers not only need to work at high altitudes many times, which increases the risk, but also has low efficiency. This technical solution integrates the grinding and cleaning operations, and the vacuuming, grinding and blowing operations are reasonably planned to avoid dust diffusion during the grinding and cleaning operations, optimize the construction environment in the tunnel, and effectively improve the construction efficiency.

[0078] This technical solution is not only suitable for the grinding and cleaning of cracks on the top of the tunnel, but is also applicable to many situations such as cracks on the side walls of the tunnel, the top of the bridge and the walls of the house. It has a wide range of applications and is easy to use.

[0079] Example 2:

[0080] The tunnel crack injection repair method of this tunnel project is basically the same as that of Example 1, except that the hanger 4 is arranged on the upper end face of the cantilever, that is, the cylinder 41 is located above the climbing frame 3. At this time, the rotating groove 33 is connected to the lower end of the rotating rod 42 through an axle pin, the output end of the cylinder 41 is rotatably connected to the rod body of the rotating rod 42, and the upper end of the rotating rod 42 is rotatably connected to the rotating seat 55.

[0081] Example 3:

[0082] The tunnel crack injection repair method of this tunnel project is basically the same as that of Example 1. The difference is that the grinding and cleaning module also includes a camera and a monitoring terminal. Construction workers can clearly observe the cracks on the tunnel top surface by holding the monitoring terminal, which facilitates making more favorable decisions.

[0083] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tunnel crack injection repair method for tunnel engineering, characterized in that: The following steps are involved: S1. Determine the direction and depth of the cracks and record the degree of water seepage; S2. Drill grouting holes obliquely on both sides of the crack along its direction and place grouting nozzles. The depth of the grouting holes should reach the deepest part of the crack. S3. Use the grinding and seam cleaning machine to perform grinding and seam cleaning operations, drive the mobile lifting module to the bottom of the tunnel crack, and raise the grinding and seam cleaning module to a suitable position from the crack surface wall through the lifting bracket. The grinding and seam cleaning module is provided with a dust suction component, a grinding component and an air blowing component from front to back. The end where the dust suction component is arranged is defined as the front end, and the opposite end is defined as the rear end. The grinding and seam cleaning module moves forward along the cracking trajectory of the crack. During the process, the gaps between the dust suction component, the grinding component and the air blowing component and the crack surface wall are adjusted by the climbing motor and the cylinder until the grinding disc and the guard cover are tightly fitted with the crack surface wall, and the grinding, seam cleaning and dust suction operations are carried out smoothly, and the position of the lower end mobile lifting module is adjusted at any time according to the direction of the crack; S4. After the grinding and cleaning work is completed, the grinding and cleaning module is disassembled and the construction workers move to the lifting platform. The lifting platform is surrounded by fences. The construction workers then raise the platform and use crack sealing glue to seal the crack surface wall and the gap between the grouting hole and the grouting nozzle. The exhaust nozzle is inserted along the direction of the crack and temporarily closed. Oil-free compressed air is input into the crack through the grouting nozzle. Soapy water is applied near the crack to check for leaks. During this process, the mobile lifting module moves steadily and slowly along the direction of the crack to ensure construction safety. S5. After ensuring that the cracks are closed, inject structural adhesive into the cracks through the grouting nozzle until the exhaust nozzle exhausts the adhesive one by one, and then close the exhaust nozzle; S6. When the structural adhesive in the crack is initially solidified and does not flow out, the exhaust nozzle and grouting nozzle can be removed, and then the crack is smoothed and sealed with sealant; S7. Observe the cracks to see if there is any water seepage. If the cracks are found to be qualified, clean and paint the crack surfaces. The tunnel can then be opened to traffic. In step S3, the grinding and seam cleaning module includes a base at the bottom and a top plate at the top. A climbing rod is vertically arranged at the rear end of the base. A climbing motor is provided in the middle of the base. The output end of the climbing motor faces upward and is connected to a screw rod. The screw rod and the climbing rod are connected by a climbing frame. The cross section of the climbing frame is a U-shaped structure. One end of the climbing frame is threadedly connected to the screw rod, and the other end of the climbing frame is slidably connected to the climbing rod. The lower end face of the climbing frame is vertically provided with a hanging rod, and a cylinder is horizontally provided on the side wall of the hanging rod facing the dust collection component. The output end of the cylinder extends horizontally and is rotatably connected to one end of the rotating rod. The rod body of the rotating rod extends upward and intersects with the end of the climbing frame cantilever. The two are movably connected at the intersection, and the other end of the rotating rod is rotatably connected to the rotating seat on the bottom surface of the top plate.

2. The method for repairing tunnel cracks by injection for tunnel engineering according to claim 1, characterized in that: In step S2, the horizontal distance between the grouting hole and the crack is between 10-25 cm, and the inclination angle between the grouting hole and the tunnel wall is between 45° and 60°.

3. The method for repairing tunnel cracks by injection for tunnel engineering according to claim 1, characterized in that: A limit rod is also provided at the rotation connection between the rotating rod and the rotating seat to limit the rotation angle of the rotating seat.

4. The method for repairing tunnel cracks by injection for tunnel engineering according to claim 1 or 3, characterized in that: Multiple grinding motors are arranged on the bottom surface of the top plate. The output end of the grinding motor passes through the top plate upward and is connected to the grinding disc. A dust suction fan and a dust collection box are arranged in the dust suction component. The guard cover is made of elastic material and is arranged along the top edge of the top plate. A through-type dust suction port is also opened at the position of the top plate corresponding to the dust suction component.

5. The method for repairing tunnel cracks by injection for tunnel engineering according to claim 4, characterized in that: The air blowing assembly blows air upwards through the air blowing port, which is arranged obliquely, and the open end of the air blowing port is inclined and extends toward the front end.

6. The method for repairing tunnel cracks by injection for tunnel engineering according to claim 1, characterized in that: In step S4, when the oil-free compressed air pressure in the crack reaches 0.5 MPa, if there are still blocked grouting nozzles, the grouting nozzles should be reburied and the distance between them should be shortened.

7. The method for repairing tunnel cracks by injection for tunnel engineering according to claim 1, characterized in that: In step S5, the grouting is carried out in a low-pressure slow injection manner, the grouting pressure is preferably 0.1-0.3 MPa, and the grouting slurry material is acrylate slurry.

8. The method for repairing tunnel cracks by injection for tunnel engineering according to claim 1, characterized in that: When working on circumferential and oblique cracks, grouting operations should be carried out from bottom to top.

Images