Construction method using slope concrete crack repairing device
By using a repair device with casing and fixed supports in soil nailing shotcrete, spraying concrete and filling grout, the cracking problem of soil nailing shotcrete when it exceeds its working life was solved, and effective repair with low cost and low space occupation was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA ROAD & BRIDGE
- Filing Date
- 2024-01-22
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, cracks in soil nailing and shotcreting slopes that have exceeded their service life have not been effectively repaired, leading to slope collapse. Furthermore, existing repair methods are not suitable for concrete slopes with soil as the base, and are costly and require a large amount of space.
A slope concrete crack repair device, including a casing and fixed supports, is used. The repair device is installed between soil nails, a layer of sprayed concrete is applied, the voids are measured, the cracks are cleaned, grout is filled, and the repair is carried out using reinforcing soil nails and grout.
It achieves effective repair without damaging the original concrete layer, with low cost and low space occupation, reducing repair difficulty and time, and providing a means of secondary reinforcement.
Smart Images
Figure CN117868170B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of concrete repair. More specifically, this invention relates to a construction method using a device for repairing cracks in concrete slopes. Background Technology
[0002] In construction projects, especially civil engineering slope protection projects, soil nailing combined with shotcrete is often used as a temporary slope protection method. This type of slope protection is non-permanent, and as the structures on the site are completed, the trench between the slope and the site structures will be backfilled. After the slope is buried by the backfill soil, the support task is completed. According to the conventional project cycle, the industry generally assumes that this type of temporary soil nailing shotcrete can work normally for six months to one year. As it is a temporary slope protection method, the industry unit price of this project is lower than that of permanent support methods such as anchor cables and anchor rods. During the use of soil nailing shotcrete, damage and large cracks may occur. In order to save costs, construction units often choose to ignore the defects or simply plaster the surface, and basically do not carry out overall repair treatment.
[0003] In recent years, the construction schedules of various projects have been affected by policies, funding, and various external factors, and the pace of project construction may be greatly slowed down or even stopped at any time. Since backfilling of the trench is only allowed after the on-site structures reach a certain height according to the design, the actual usage time of soil nailing and shotcrete, as a temporary support method, often far exceeds the planned time. Soil nailing and shotcrete, which should have been buried during trench backfilling, continues to develop and worsen cracks during the extended work period. Furthermore, with the influence of weather conditions such as rain and snowmelt, cavities are formed between the shotcrete layer around the cracks and the underlying soil, which continue to enlarge until the slope collapses, directly exposing the slope. At this point, due to insufficient space for secondary slope protection construction caused by structures within the foundation pit, it is difficult to repair again, and ultimately only temporary measures such as sandbags can be used for sealing. Existing technologies have little consideration for the repair of concrete cracks in soil nailing and shotcrete support. (Application publication number CN 114319240) Patent A discloses a method for filling cracks in concrete slope protection of ditch masonry. It repairs cracks in concrete slope by embedding grouting nozzles and grouting. This method is suitable for concrete slope protection with brick masonry base, but not for repairing cracks in concrete slope with soil base.
[0004] Therefore, it is necessary to propose a device and method for repairing cracks in concrete slopes. The cost of soil nailing and spraying slopes using this device and method remains basically unchanged, and it provides a good means of secondary reinforcement and repair when the working period is exceeded. The repair method occupies little space and has low cost. Summary of the Invention
[0005] One objective of this invention is to provide a construction method using a slope concrete crack repair device, which enables effective secondary reinforcement without breaking the original concrete layer when through cracks appear in ordinary soil nailing sprayed slopes.
[0006] To achieve these and other advantages according to the invention, according to one aspect of the invention, the invention provides a construction method using a slope concrete crack repair device, the repair device comprising a casing and a fixing support, the fixing support being fixed to the slope soil, the casing and the fixing support being detachably connected, and the construction method comprising the following steps: S1. Soil nailing is carried out on the slope soil according to the design requirements; S2. Repair devices are installed at intervals on the slope soil between the soil nails. The bottom of the repair device is tightly fixed to the slope soil. The distance between the outermost end of each repair device and the slope soil is recorded manually. After the recording is completed, the end of the repair device away from the slope soil is sealed. S3. Hang steel mesh on the slope soil and use binding wire to tie the repair device, soil nail and steel mesh tightly, and spray concrete onto the slope soil to form a sprayed concrete layer. S4. Observe the formation of new cracks and the development of old cracks in the shotcrete layer on time. For areas with wider or denser cracks, open the sealed end of the repair device in that area, measure the distance between the end of the repair device and the slope soil at this time, and compare it with the previous record. If there is obvious delamination or cavity between the shotcrete layer and the slope soil below, measure the amount of voids corresponding to the repair device from near to far along both sides of the crack location to confirm the repair area. S5. Clean up any loose sand and gravel from the larger cracks in the shotcrete layer, and then seal the cracks in the repair area with surface mortar. S6. Insert reinforcing soil nails into the slope soil from the repair device within the repair area. After all reinforcing soil nails are installed, inject grout into the repair device from bottom to top within the repair area until the voids under the shotcrete layer are filled and compacted.
[0007] Preferably, the fixed support includes a grid frame, a fixed cylinder is connected to the grid frame on one side of the slope soil body, the protective sleeve is detachably connected to one end of the fixed cylinder on the other side of the slope soil body, and multiple fixed plates are connected to the other end of the fixed cylinder along the slope soil body, with wire mesh connecting two adjacent fixed plates.
[0008] Preferably, one end of the protective sleeve is fitted inside the fixed sleeve and extends outward from the fixed sleeve by a length ≥15cm. The extended end of the protective sleeve has external threads and is fitted with a protective cap that is screwed on.
[0009] Preferably, the diameter of the protective sleeve is ≥50mm, and the material of the protective sleeve and the protective cover is polyvinyl chloride plastic.
[0010] Preferably, step S2 includes the following steps: A1: Align the fixed support with the positioning point, and use a manual hammer to hammer the fixed plate into the slope soil until the fixed support can be firmly placed in the slope soil. A2: String the casing inside the fixed cylinder, use a ruler to reach inside the casing, record the distance from the end of the casing to the slope surface of the soil, and record it on the inner wall of the casing with a marker. A3: Tighten the protective cap onto the protruding end of the sleeve.
[0011] Preferably, step S6 includes the following steps: B1: Open the protective cover of the repair device within the repair area, and insert a Luoyang shovel into the slope soil through the protective casing to dig a hole, forming a manual excavation hole with a depth of 1.5~2m; B2: Insert the reinforcing soil nail into the manually excavated hole from the casing, and lower the grouting pipe into the manually excavated hole along with the reinforcing soil nail; B3: After all the reinforcing soil nails in the repair area are installed, grouting is carried out from the grouting pipes corresponding to the two outermost repair devices in the bottom row of the repair area. When the overflow of grout into the casing area is observed in this repair device, grouting is stopped and the device is left to stand for observation. After the grout material has no sinking, the casing is sealed with mortar. Then, construction is carried out inwards in sequence until the grouting operation of this row is completed. B4: After the grouting operation in each row of repair devices is completed, wait 2 hours and repeat the operation of B1-B3 on the previous row of repair devices.
[0012] Preferably, when the slope soil is loose and not suitable for artificial drilling, the reinforcing soil nail is a grouting pipe. The grouting pipe is a tubular component with one end conical and the other end open. The outer diameter of the grouting pipe is smaller than the inner diameter of the casing. The grouting pipe is installed into the slope soil by mechanical hammering or hole drilling. Multiple grouting holes are spaced apart on the casing wall of the grouting pipe in the slope soil.
[0013] Preferably, the grouting material is a micro-expansion cement grouting material.
[0014] The present invention has at least the following beneficial effects: First, the repair device has extremely low cost, can be installed simultaneously with the soil nailing, and does not affect the normal construction cycle of the slope protection. Secondly, the repair device can provide an effective means of recording voids when large through cracks appear in ordinary soil nailing sprayed slopes, and can carry out secondary reinforcement without breaking the original concrete layer, greatly reducing the difficulty of repairing such slopes.
[0015] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the soil nail sprayed slope that needs to be repaired in one technical solution of the present invention; Figure 2 This is a frontal schematic diagram of the soil nail sprayed slope to be repaired in one technical solution of the present invention; Figure 3 This is a schematic diagram of the voided soil area beneath the soil nail sprayed slope that needs to be repaired in one technical solution of the present invention; Figure 4 This is a schematic diagram of a repair device in one technical solution of the present invention; Figure 5 This is a schematic diagram showing the arrangement of the repair device, soil nails, and steel mesh in one technical solution of the present invention; Figure 6 This is a schematic cross-sectional view of section A in one technical solution of the present invention; Figure 7 This is a schematic diagram of soil nailing grouting in one technical solution of the present invention; Figure 8 This is a schematic diagram of a grouting perforated pipe in one technical solution of the present invention; Figure 9 This is a detailed schematic diagram showing the completion of grouting using a grouting perforation pipe in one technical solution of the present invention. Detailed Implementation
[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can implement it based on the description.
[0018] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0019] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the components and materials mentioned are commercially available. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0020] like Figures 1-9 As shown, the present invention provides a construction method using a slope concrete crack repair device, including a repair device 4 comprising a casing 41 and a fixing support 42, wherein the fixing support 42 is fixed to the slope soil 1, and the casing 41 and the fixing support 42 are detachably connected. The construction method includes the following steps: S1. Soil nails 3 are constructed on the slope soil 41 according to the design requirements. Specifically, the soil nails 3 are threaded steel bars with a diameter of 16~22mm and a length of 1~2m or other forms of soil nails set according to the design requirements. They are driven into the slope soil 1 by mechanical hydraulic or manual hammering. The length of the soil nail 3 protruding from the slope soil 1 is about 100~300mm. The spacing between soil nails 3 is usually 1000mm. S2. Repair devices 4 are installed at intervals on the slope soil 1 between the soil nails 3. The bottom of the repair device 4 is tightly fixed to the slope soil 1. The distance between the outermost end of each repair device 4 and the slope soil 1 is recorded manually. After recording, the end of the repair device 4 away from the slope soil 1 is sealed. Specifically, the fixing support 42 is cylindrical and is fixed to the slope soil 1 by manual hammering. Then, the casing 41 is inserted into the fixing support 42. The distance between the end of the casing 41 and the surface of the slope soil 1 is recorded so as to determine whether there is a void. In order to prevent concrete and rainwater from flowing into the slope soil 1 through the inside of the casing 4 in subsequent processes and during the use of the slope, sealing caps or tapes are used to fill the casing 41. S3. Hang a steel mesh 30 on the slope soil 1 and use binding wire to tie the repair device 4, soil nail 3 and steel mesh 30 tightly. Spray concrete onto the slope soil 1 to form a sprayed concrete layer 2. The steel mesh 30 is a steel mesh composed of multiple plain round steel bars with a diameter of 6~12mm and a horizontal and vertical spacing of 150~300mm. Hang the steel mesh 30 on the soil nail 3 that has been set up and tie it manually to fix the steel mesh 30 in place. In order to prevent the repair device 4 from being displaced by the sprayed concrete, it is also necessary to use binding wire to fix the repair device 4 and the steel mesh 30. The material of the sprayed concrete layer 2 is conventionally C25 concrete. The thickness of the sprayed concrete layer 2 is 80~120mm. Theoretically, there should be no gap between the sprayed concrete layer 2 and the slope soil 1 after completion. After normal curing, the sprayed concrete layer 2 should not have any through cracks. S4. Regularly observe the formation of new cracks and the development of existing cracks in the shotcrete layer 2. For areas with wider or denser cracks, open the sealed end of the repair device 4 in that area, measure the distance between the end of the repair device 4 and the slope soil 1, and compare it with previous records. If there is obvious delamination or cavitation between the shotcrete layer 2 and the underlying slope soil 1, measure the corresponding repair device along both sides of the crack from near to far to confirm the repair area. Specifically, during daily inspections, inspectors can use steel bars or other hard tools to tap the cracks. If a large area of obvious voids is heard in the surrounding concrete, open the seals of the repair devices 4 on both sides of the crack area and observe whether there is any void between the slope soil 1 and the shotcrete layer 2 inside the repair device 4. If the shotcrete layer 2 in the area where this repair device 4 is located is voided from the slope soil 1 below, record the amount of void at that location. Then open another repair device 4 to the outside of this row to observe whether there is any void until there is no void under the repair device 4. If the crack has not developed to the top of the shotcrete layer 2, the repair devices 4 above the crack need to be checked one by one. S5. Clean up the loose sand and gravel at the larger cracks on the shotcrete layer 2, and then fill and seal the cracks in the repair area with surface mortar. Specifically, since the original shotcrete layer 2 will act as a template in the subsequent grouting work, it is necessary to fill the larger gaps in the preliminary filling. For the repair area where the cracks extend directly to the bottom of the slope, sandbags should be piled up at the bottom of the slope below the repair area to prevent a large amount of grout leakage. S6. Reinforcing soil nails 5 are inserted into the slope soil 1 from the repair device within the repair area. After all reinforcing soil nails 5 are installed, grouting material is injected into the repair device 4 from bottom to top within the repair area until the void layer 10 under the sprayed concrete layer 2 is filled and compacted. Specifically, the reinforcing soil nails 5 can be threaded steel bars or grouting pipes. The reinforcing soil nails 5 are inserted after the holes are manually dug. If the slope soil 1 is loose and the holes are prone to collapse, the reinforcing soil nails 5 are driven into the slope soil 1 by mechanical hydraulic or hammering. After all reinforcing soil nails 5 are installed, micro-expansion cement grouting material or other materials are injected into the manually dug holes 11 using grouting pipes. Under the action of gravity, the grouting material fills and compacts the void layer 10 on both sides and the bottom of the repair device 4.
[0021] In this technical solution, the repair device 4 can be made entirely of polyvinyl chloride plastic material. The cost of mass production and unified installation of the repair device 4 accounts for only about 2% of the total cost of the entire slope protection and earthwork project. The soil nail concrete slope using the repair device 4 has a convenient repair method after through cracks appear without occupying additional space. There is no need to introduce large vehicles or equipment such as excavators. When the soil nail concrete slope exceeds its normal service life, the void layer can be effectively grouted without damaging the original shotcrete layer 2. The repair operation cycle is short and the cost is low.
[0022] In another technical solution, the fixed support 42 includes a grid frame 420, with a fixed cylinder 421 connected to the outside of the slope soil 1 on one side of the grid frame 420. A protective sleeve 41 is detachably connected to one end of the fixed cylinder 421 facing outwards from the slope soil 1. Multiple fixing plates 422 are connected to the other end of the fixed cylinder 421 towards the slope soil 1. A wire mesh 423 connects adjacent fixing plates 422. The fixing plates 421 can be made of iron or polyvinyl chloride plastic. When the fixed cylinder 421 is struck by external force, the fixing plates 421 can be inserted into the slope soil 1. The connected wire mesh 423 can effectively seal the gap between the fixing plate 421 and the slope soil 1, which can prevent concrete from being directly sprayed into or the uncured concrete from flowing into the gap between the repair device 4 and the slope soil 1. The grid frame 420 is composed of multiple steel bars or multiple thin steel plates welded together. After the sprayed concrete layer 2 solidifies, the grid frame 420 is fixed in the sprayed concrete layer 2 so that the repair device 4 does not move with the change of the slope soil 1. The outer diameter of the protective sleeve 41 is equal to the inner diameter of the fixing sleeve 421, and the protective sleeve 41 is tightly fitted inside the fixing sleeve 421.
[0023] In another technical solution, one end of the protective sleeve 41 is fitted inside the fixed sleeve 421 and extends outward from the fixed sleeve 421 by a length ≥15cm. The extended end of the protective sleeve 41 has external threads and is matched with a protective cover 40 for screwing. Before screwing the protective sleeve 41 and the protective cover 40 together, multiple turns of hemp fiber can be wrapped around it. After the protective cover 40 is tightened, it can not only prevent concrete from being sprayed into the protective sleeve 41 during the shotcrete process, but also prevent rainwater from entering the repair device 4 during the subsequent slope protection process.
[0024] In another technical solution, the characteristic is that the diameter of the protective sleeve 41 is ≥50mm, the material of the protective sleeve 41 and the protective cover 40 is polyvinyl chloride plastic, the protective sleeve 41 needs to be able to accommodate a Luoyang shovel with a diameter of 50mm, and the material of the protective sleeve 41 and the protective cover 40 is polyvinyl chloride plastic, which can reduce material costs while ensuring project quality.
[0025] In another technical solution, step S2 includes the following steps: A1: Align the fixed support 42 with the positioning point, and use a manual hammer to hammer the fixed piece 422 into the slope soil 1 until the fixed support 42 can be firmly placed in the slope soil 1. Specifically, the grid frame 420 can be appropriately deformed by hammering or bending to better fit the slope soil 1, so as to prevent the repair device 4 before hanging the steel mesh 30 sheets from loosening. The axis of the fixed cylinder 421 is perpendicular to the slope soil 1. A2: String the casing 41 inside the fixed cylinder 421. Use a ruler to reach into the casing 41 and record the distance from the end of the casing 41 to the slope surface 1 of the soil. Record the distance on the inner wall of the casing with a marker. Alternatively, a thin steel bar can be placed inside the casing 41 with its bottom in contact with the slope surface 1 of the soil. Mark the position of its other end inside the casing 41 with a marker. In subsequent observation and recording work, repeat the above actions directly with this thin steel bar for comparison.
[0026] A3: Tighten the protective cover 40 onto the protruding end of the protective sleeve 41. Specifically, the protective cover 40 shall remain closed throughout the subsequent process until it is opened for observation in order to repair the crack. If it is opened or there is no loose layer 10 under the repair device 4, the protective cover 40 shall be put back on the protective sleeve 41 to prevent rainwater from entering the repair device 4.
[0027] In another technical solution, step S6 includes the following steps: B1: Open the protective cover 40 of the repair device within the repair area, insert a Luoyang shovel into the slope soil 1 through the protective casing 41 to make a hole, forming a manually excavated hole 11 with a depth of 1.5~2m, the diameter of the manually excavated hole 11 is smaller than the inner diameter of the protective casing 41; B2: Insert the reinforcing soil nail 5 into the manually excavated hole 11 from the casing, and lower the grouting pipe into the manually excavated hole 11 along with the reinforcing soil nail 5; specifically, the reinforcing soil nail 5 is a threaded steel bar with a diameter of 16~22mm; B3: After all the reinforcing soil nails 5 are installed in the repair area, grouting is carried out from the grouting pipes 51 corresponding to the two outermost repair devices 4 in the bottom row of the repair area. When the overflow of grout into the casing 1 area is observed in this repair device 4, grouting is stopped and the area is left to stand for observation. After the grout material does not sink, the casing 1 is sealed with mortar. Then, the construction is carried out inwards until the grouting operation of this row is completed. Specifically, the manually excavated hole 11 is perpendicular to the slope surface and tilts downwards from the hole opening. After grouting, the grout first fills the manually excavated hole 11. Then the grout flows out from the hole opening of the manually excavated hole 11 and fills the void area 10 between the original shotcrete layer 2 and the slope soil 1 under its own weight. When the grout overflows up the casing 1, the grouting machine is turned off and left to stand for 5 minutes to ensure that the grout fills the area below the repair device 4 in this row. After the grout has initially set, the grouting construction in the previous row of repair devices 4 is started. Optionally, the grouting pipe 51 can be pulled out during the construction process for reuse.
[0028] B4: After the grouting operation in each row of repair devices is completed, wait 2 hours and repeat the operation of B1-B3 on the previous row of repair devices.
[0029] In this technical solution, since the slope using temporary slope support generally has a vertical height of no more than 5m, the overall construction grouting time can be controlled within 8 hours, and no additional waste is generated. The entire construction process does not conflict with the site or time of the large-scale construction.
[0030] In another technical solution, when the slope soil is loose and not suitable for artificial drilling, the reinforcing soil nail 5 is a grouting pipe 50. The grouting pipe 50 is a tubular component with one end tapered and the other end open. The outer diameter of the grouting pipe 50 is smaller than the inner diameter of the casing. The grouting pipe 50 is installed into the slope soil 1 by mechanical hammering or hole drilling. The grouting pipe 50 has multiple grouting holes 500 spaced apart on the casing wall in the slope soil. In this technical solution, the grouting pipe 50 is a commercially available component. The grouting pipe 50 is actually a reinforcing soil nail 5 that combines grouting function. The construction process is the same as that of a conventional reinforcing soil nail 5.
[0031] In another technical solution, the grouting material is a micro-expansion cement grouting material, which may be appropriately supplemented with additives such as early-strength agents.
[0032] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.
Claims
1. A construction method using a slope concrete crack repair device, characterized in that, The repair device includes a protective casing and a fixing support. The fixing support is fixed to the slope soil. The protective casing and the fixing support are detachably connected. The fixing support includes a grid frame. A fixing casing is connected to the grid frame on one side of the slope soil. The protective casing is detachably connected to one end of the fixing casing on the other side of the slope soil. Multiple fixing plates are connected to the other end of the fixing casing towards the slope soil. A wire mesh is connected between two adjacent fixing plates. One end of the protective casing is fitted inside the fixing casing and extends outward from the fixing casing by a length ≥15cm. The extended end of the protective casing has external threads and is fitted with a protective cap that is screwed on. The construction method includes the following steps: S1. Soil nailing is carried out on the slope soil according to the design requirements; S2. Repair devices are installed at intervals on the slope soil between the soil nails. The bottom of the repair device is tightly fixed to the slope soil. The distance between the outermost end of each repair device and the slope soil is recorded manually. After the recording is completed, the end of the repair device away from the slope soil is sealed. S3. Hang steel mesh on the slope soil and use binding wire to tie the repair device, soil nail and steel mesh tightly, and spray concrete onto the slope soil to form a sprayed concrete layer. S4. Observe the formation of new cracks and the development of old cracks in the shotcrete layer on time. For areas with wider or denser cracks, open the sealed end of the repair device in that area, measure the distance between the end of the repair device and the slope soil at this time, and compare it with the previous record. If there is obvious delamination or cavity between the shotcrete layer and the slope soil below, measure the amount of voids corresponding to the repair device one by one from near to far along both sides of the crack location to confirm the repair area. S5. Clean up any loose sand and gravel from the larger cracks in the shotcrete layer, and then seal the cracks in the repair area with surface mortar. S6. Insert reinforcing soil nails into the slope soil from the repair device within the repair area. After all reinforcing soil nails are installed, inject grout into the repair device from bottom to top within the repair area until the voids under the shotcrete layer are filled and compacted.
2. The construction method using the slope concrete crack repair device as described in claim 1, characterized in that... The diameter of the protective sleeve is ≥50mm, and the material of the protective sleeve and the protective cover is polyvinyl chloride plastic.
3. The construction method using the slope concrete crack repair device as described in claim 2, characterized in that, Step S2 includes the following steps: A1: Align the fixed support with the positioning point, and use a manual hammer to hammer the fixed piece into the slope soil until the fixed support is firmly placed in the slope soil. A2: Place the casing inside the fixed cylinder, use a ruler to reach inside the casing, record the distance from the end of the casing to the slope surface, and record it on the inner wall of the casing with a marker. A3: Tighten the protective cap onto the protruding end of the sleeve.
4. The construction method using the slope concrete crack repair device as described in claim 2, characterized in that, Step S6 includes the following steps: B1: Open the protective cover of the repair device in the repair area, insert a Luoyang shovel into the slope soil through the protective sleeve to dig a hole, and the depth of the artificial hole is 1.5~2m; B2: Insert reinforcing soil nails into the manually excavated hole from the casing, and lower the grouting pipe into the manually excavated hole along with the reinforcing soil nails; B3: After all the reinforcing soil nails in the repair area are installed, grouting is carried out from the grouting pipes corresponding to the two outermost repair devices in the bottom row of the repair area. When the overflow of grout into the casing area is observed in this repair device, grouting is stopped and the device is left to stand for observation. After the grout material has no sinking, the casing is sealed with mortar. Then, construction is carried out inwards in sequence until the grouting operation of this row is completed. B4: After the grouting operation in each row of repair devices is completed, wait 2 hours and repeat the operation of B1-B3 on the next higher row of repair devices.
5. The construction method using the slope concrete crack repair device as described in claim 2, characterized in that, When the slope soil is loose and not suitable for artificial drilling, the reinforcing soil nail is a grouting pipe. The grouting pipe is a tubular component with one end conical and the other open. The outer diameter of the grouting pipe is smaller than the inner diameter of the casing. The grouting pipe is installed into the slope soil by mechanical hammering or hole drilling. Multiple grouting holes are spaced apart on the casing wall of the grouting pipe in the slope soil.
6. The construction method using the slope concrete crack repair device as described in claim 1, characterized in that, The grouting material is a micro-expansion cement grouting material.