Embankment body cavity grouting device

Abstract

The invention relates to the technical field of grouting devices, and discloses an embankment cavity grouting device which comprises a movable base, a slurry container, a slurry conveying pump and a grouting pipe assembly, the slurry container, the slurry conveying pump and the grouting pipe assembly are installed at the top of the movable base, and the slurry container is communicated with the grouting pipe assembly through the slurry conveying pump and a pipeline; and a rigid grouting pipe and a plurality of flexible telescopic grouting pipes are arranged in the grouting pipe. By means of the air bag ring, when the rigid grouting pipe is used, the rigid grouting pipe can conduct grouting on a hole with a large space, for the hole with a gap, the position of a pipe opening of the telescopic grouting pipe can be adjusted in the mode that the rigid grouting pipe stretches into the telescopic grouting pipe, the air bag ring is matched, and grouting on the hole gap with the special position or the irregular shape is achieved; the problem that slurry is difficult to feed into an existing grouting device for the gap is solved, and the grouting efficiency in the prior art is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of grouting equipment technology, and more particularly to a grouting equipment for dam cavities. Background Technology

[0002] The main manifestations of embankment damage are road surface breakage and subsidence, and large areas of loose soil in the embankment, with large cavities appearing in some areas and further deteriorating.

[0003] In addition to bearing weight, the water-stabilized layer also serves to prevent surface water infiltration and groundwater rise. When damaged, the road surface cracks and subsides, and a large amount of surface water flows into the embankment during rain. The embankment fill is sandy silt, which liquefies when it comes into contact with water. The large amount of soil piled up in the embankment causes damage to the retaining wall, and the embankment is squeezed, causing deformation and cracking, creating channels for water loss. In addition, most of the old seawall's filter structure is damaged, resulting in a large amount of soil loss in the embankment and the creation of large areas of voids.

[0004] After the road surface cracked and subsided, rainy weather caused a large amount of water to accumulate on the road surface. The water flowed into the embankment along the cracks and the gaps between the road surface and the retaining wall, causing the voids in the dam body to gradually worsen. Therefore, waterproof materials were used to fill and seal the surface of the cracks. However, because the voids at the bottom were not filled and reinforced, the temporarily sealed cracks would crack again as the dam body further deformed and shifted. Therefore, cement mortar and other materials are currently used to fill the voids, seal any possible seepage channels in the soil, and improve the overall deformation resistance and seepage resistance of the embankment body.

[0005] However, some gaps may be difficult to grout due to their special location or irregular shape, and existing grouting devices have difficulty delivering grout into such gaps. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art by proposing a grouting device for dam cavities.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A grouting device for embankment cavities includes a movable base, a grout container and a grout delivery pump mounted on top of the movable base, and a grouting pipe assembly. The grout container is connected to the grouting pipe assembly via the grout delivery pump and pipelines. The grouting assembly includes: The outer casing contains a rigid grouting pipe and several flexible, extendable grouting pipes. Two interconnected airbag rings are fitted on the outer side of the end of the retractable grouting pipe away from the grout delivery pump. The airbag rings are installed on the outside of the retractable grouting pipe through elastic connectors. The airbag rings are provided with annular array of airbag cavities. An inflation pipeline system is provided on the airbag rings.

[0008] Preferably, the inner ring size of one of the airbag rings is adapted to the outer ring size of the telescopic grouting pipe, and the inner side of the other airbag ring is recessed towards the center of the airbag cavity, and the number of recesses is the same as the number of airbag cavities, and their positions correspond.

[0009] Preferably, the elastic connector includes a fixing block installed at the end of the telescopic grouting pipe and an elastic rope connected to the fixing block, the other end of which is connected to the outside of the airbag ring.

[0010] Preferably, the expandable grouting pipe includes a flexible pipe section and a telescopic pipe section. The telescopic pipe section is a corrugated pipe, which is located above the inner wall of the outer sleeve. Its upper end is connected to the grout delivery pump through a pipeline, and its lower end is connected to the flexible pipe section. A slider is installed on the outer side of the flexible pipe section, and a groove is opened on the outer side of the outer sleeve, which extends into the inner cavity of the outer sleeve. The slider is slidably connected to the groove.

[0011] Preferably, the rigid grouting pipe is fixedly installed inside the outer sleeve by a connecting rod, and the outer side of the rigid grouting pipe is provided with several embedding grooves, and the telescopic grouting pipe is embedded in the corresponding embedding grooves.

[0012] Preferably, a support frame is installed on the outer side of the outer sleeve, and the support frame is used to support the outer sleeve for grouting the cavity.

[0013] Preferably, the airbag cavity is provided with eight, and the eight airbag cavities divide the airbag ring into eight equal parts. The recessed part includes a number of spherical concave pieces that are stacked and connected in sequence, and the airbag ring with the concave pieces is located below another airbag ring.

[0014] Preferably, a camera is installed at the bottom end of the retractable grouting pipe, and the other end of the camera is connected to a display terminal.

[0015] Preferably, a cleaning brush is installed on the outer side of the bottom end of the retractable grouting pipe. The cleaning brush has hard bristles, and the camera is located inside the cleaning brush.

[0016] The method of using the grouting device for embankment voids includes the following steps: Installation: Install the outer sleeve into the opening; Grouting: The grout delivery pump is activated to deliver grout to the rigid grouting pipe and several flexible, extendable grouting pipes toward the cavity; Posture adjustment: Vertical position adjustment: Extend the telescopic grouting pipe to adjust the depth of its bottom end in the cavity; Tilt position adjustment: Inflate the corresponding number of air bladders. By filling the concave part with air, the concave part expands in the direction of the retractable grouting pipe, causing the retractable grouting pipe to shift in the direction of force, thus completing the tilt position adjustment. Adjustment of the shape of the retractable grouting pipe opening: Inflate the symmetrical air bladder cavity to compress the retractable grouting pipe opening, thereby facilitating the passage of the retractable grouting pipe opening through narrow gaps. Cleaning debris: Alternately inflate and deflate the symmetrical air bladder cavities to allow the retractable grouting pipe opening to swing and clean the internal gravel.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention, through the design of an airbag ring, allows the rigid grouting pipe to grout larger cavities during use. For cavities with gaps, a telescopic grouting pipe can be inserted, and the position of the telescopic grouting pipe opening can be adjusted in conjunction with the airbag ring. This enables grouting of cavities and gaps in special locations or with irregular shapes, solving the problem that existing grouting devices have difficulty delivering grout into such gaps, and effectively improving the grouting efficiency of existing technologies. Attached Figure Description

[0018] Figure 1 This is a front view of the grouting device for embankment cavities proposed in this invention; Figure 2 This is a top view of the grouting component of the grouting device for grouting cavities in the dike body proposed in this invention; Figure 3 This is a schematic diagram of the bottom end of the telescopic grouting pipe of the grouting device for grouting cavities in the dike body proposed in this invention. Figure 4 This is a top view of the airbag ring of the grouting device for dam cavities proposed in this invention.

[0019] In the diagram: 1. Movable base; 2. Slurry container; 3. Slurry delivery pump; 4. Rigid grouting pipe; 5. Telescopic grouting pipe; 6. Airbag ring; 7. Airbag cavity; 8. Inflatable piping system; 9. Fixing block; 10. Elastic rope; 11. Flexible pipe section; 12. Telescopic pipe section; 13. Slide groove; 14. Sliding block; 15. Embedded groove; 16. Support frame; 17. Recessed plate; 18. Camera; 19. Cleaning brush. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figures 1-4A grouting device for embankment cavities includes a mobile base 1, a grout container 2 mounted on top of the mobile base 1, a grout delivery pump 3, and a grouting pipe assembly. The mobile base 1 includes a platform and four casters mounted at the bottom corners of the platform. The casters are polyurethane casters with braking function, and their load-bearing capacity meets the overall operational requirements of the device. The device is flexible in relocation and stable in positioning, suitable for multi-point mobile construction on the embankment. The grout container 2 has a box-shaped design with an opening at the top for easy grout pouring. A filter screen can be installed at the opening to prevent debris from entering the pump body, avoiding blockage of the pump body and pipeline, and ensuring continuous and stable grouting operations. The grout container 2 is connected to the grouting pipe assembly through the grout delivery pump 3 and pipelines. That is, the input end of the grout delivery pump 3 is connected to the grout container 2 through a pipeline, and the output end of the grout delivery pump 3 is connected to the grouting assembly through a pipeline. The grouting assembly includes: The outer casing contains a rigid grouting pipe 4 and several flexible, extendable grouting pipes 5. Four extendable grouting pipes 5 are evenly arranged around the rigid grouting pipe 4. The output pipe of the grout delivery pump 3 is equipped with a connector that matches the rigid grouting pipe 4 and the flexible, extendable grouting pipes 5. The connector is a multi-way diverter to achieve uniform grout distribution, allowing the grout to be diverted and delivered to the rigid grouting pipe 4 and the flexible, extendable grouting pipes 5. Each of the rigid grouting pipe 4 and the flexible, extendable grouting pipes 5 is equipped with a solenoid valve at its top. The solenoid valve is a DC24V normally closed solenoid valve, powered by an external power supply, used to independently control whether grout enters each pipe. Synchronous grout supply and independent grout control of multiple pipes enable precise grouting of large cavities and fine gaps, avoiding leakage and overflow, and improving grout utilization.

[0022] Two interconnected airbag rings 6 are movably fitted on the outer side of the retractable grouting pipe 5 away from the grout delivery pump 3. The two airbag rings 6 are integrally vulcanized and connected, with a fixed vertical spacing. The airbag rings 6 are installed on the outside of the retractable grouting pipe 5 via elastic connectors. Each airbag ring 6 contains an annular array of airbag cavities 7, which are independently sealed and do not allow air to cross between each other. An inflation pipeline system 8 is provided on the airbag rings 6. The inflation pipeline system 8 includes several inflation and deflation pipelines and a bidirectional air pump. The bidirectional air pump can be mounted on a mobile platform. The rated inflation pressure of the bidirectional air pump is 0.6 MPa, and it is equipped with a pressure regulating valve to achieve precise pressure control. Each airbag cavity 7 is connected to a corresponding inflation / deflation pipeline. The inflation / deflation pipeline is made of high-pressure nylon tubing, and the outer wall of the pipeline is tied and fixed to the outer wall of the retractable grouting pipe 5. The connection is sealed with a sealing ring to prevent air leakage. The other end of each inflation / deflation pipeline is connected to a bidirectional air pump bladder. This satisfies the inflation / deflation operation of each airbag cavity 7, thereby realizing the expansion and contraction of the airbag cavity 7. The outer side of each airbag ring 6 is provided with a wear-resistant layer, which can be made of polyurethane material or rubber, with a thickness of 1.5mm, to prevent the airbag from being torn by gaps. The independent airbag cavity has precise posture adjustment and reliable sealing. The wear-resistant layer greatly improves the service life of the airbag and is suitable for harsh working conditions with gravel gaps in the embankment.

[0023] With the airbag ring 6 in place, the rigid grouting pipe 4 can grout larger cavities during use. For cavities with gaps, the position of the retractable grouting pipe 5 can be adjusted by inserting it in conjunction with the airbag ring 6, thus enabling grouting of cavities with special locations or irregular shapes. This solves the problem that existing grouting devices have difficulty delivering grout into such gaps, effectively improving the grouting efficiency of existing technologies. The cavities are filled without dead corners and have higher density, significantly improving the seepage prevention capacity and structural stability of the dike and extending the service life of the dike.

[0024] In this embodiment, the inner ring size of one of the airbag rings 6 is adapted to the outer ring size of the retractable grouting pipe 5. When inflated, the inner ring has a pre-reserved grout passage gap to prevent compression of the retractable grouting pipe 5 and subsequent blockage. The inner side of the other airbag ring 6 is recessed towards the center of the airbag cavity 7, and the number of recesses is the same as the number of airbag cavities 7, with corresponding positions. The airbag ring 6 is mainly used to fix the retractable grouting pipe 5 after it is inserted into the cavity; that is, by inflating the airbag ring 6, it allows... The airbag ring 6 abuts against the crevice wall, thereby fixing the position of the telescopic grouting tube 5. At this time, inflating the corresponding airbag cavity 7 in another airbag ring 6 will apply a force to adjust the direction of the telescopic grouting tube 5. Then, by controlling the extension of the telescopic grouting tube 5, the opening of the telescopic grouting tube 5 can be extended to the side of the adjustment direction, completing the process of the telescopic grouting tube 5 penetrating into the crevice. This facilitates the grouting process in difficult-to-grout locations. The fixation is reliable and does not shift, and the adjustment is flexible and does not jam, which greatly improves the grouting pass rate and filling quality of narrow crevice.

[0025] In this embodiment, the elastic connector includes a fixing block 9 installed at the end of the telescopic grouting pipe 5 and an elastic rope 10 connected to the fixing block 9. The fixing block 9 is fastened to the outer wall of the telescopic grouting pipe 5 by threads. Four elastic ropes 10 are evenly arranged circumferentially. The other end of the elastic rope 10 is connected to the outside of the airbag ring 6. The elastic rope 10 can be made of natural rubber, and its elastic modulus meets the airbag reset requirements. With the elastic rope 10, after the airbag ring 6 is fixed in the gap, the telescopic grouting pipe 5 can be pushed deeper into the gap. After entering the gap, the airbag ring 6 becomes smaller by venting the gas. At this time, the position of the airbag ring 6 can be reset by the elastic force of the elastic rope 10 to prepare for the next pipe opening rotation. The airbag resets automatically without manual adjustment, simplifying the operation process and improving the efficiency of continuous construction.

[0026] In this embodiment, the expandable grouting pipe 5 includes a flexible pipe section 11 and a telescopic pipe section 12. The telescopic pipe section 12 is a corrugated pipe made of stainless steel, with a stretching stroke of 0-500mm. It is located above the inner wall of the outer sleeve, with its upper end connected to the grout delivery pump 3 via a pipeline, and its lower end connected to the flexible pipe section 11. The flexible pipe section 11 is made of TPU high-pressure flexible pipe, with its outer wall covered with a nylon protective mesh to prevent it from being punctured by gravel. A slider 14 is installed on the outer side of the flexible pipe section 11, and a groove 13 is opened on the outer side of the outer sleeve, extending into the inner cavity of the outer sleeve. A fluororubber sealing ring is embedded in the inner wall of the groove 13 to achieve sliding sealing and prevent grout leakage. The slider 14 is slidably connected to the groove 13, with a uniform sliding gap and no jamming. The flexible pipe section 11 can be slidable by the slider 14 to control the position of the pipe opening of the expandable grouting pipe 5. It can extend and retract freely vertically, has strong bending adaptability, precise depth adjustment, and a leak-proof seal, adapting to cavities and gaps of different depths and shapes.

[0027] In this embodiment, the rigid grouting pipe 4 is fixedly installed inside the outer sleeve by connecting rods. The connecting rods are evenly distributed around the circumference and are firmly connected without loosening. Several embedding grooves 15 are provided on the outer side of the rigid grouting pipe 4. The size of the embedding grooves 15 is adapted to the outer diameter of the telescopic grouting pipe 5. The telescopic grouting pipe 5 is embedded in the corresponding embedding grooves 15. The embedding grooves 15 can optimize the volume of the entire outer sleeve and limit the position of the telescopic grouting pipe 5, making it easier for the telescopic grouting pipe 5 to slide inside the outer sleeve. Reducing the outer diameter of the outer sleeve makes it easier to insert into narrow holes, constrains the pipe body to avoid shaking, and makes storage and extension smoother.

[0028] In this embodiment, a support frame 16 is installed on the outer side of the outer sleeve. The support frame 16 is a three-claw folding bracket with an adjustable opening angle. The support frame 16 is used to support the outer sleeve to grout the cavity and prevent the outer sleeve from shaking or shifting during the grouting process. The bracket provides stable support and has strong angle adaptability, which can offset the pipe displacement caused by the grouting pressure and ensure accurate grouting position.

[0029] In this embodiment, eight air bladder cavities 7 are provided, and the eight air bladder cavities 7 divide the air bladder ring 6 into eight equal parts. The recessed area includes several spherical crown-shaped recessed pieces 17 that are connected in sequence. The recessed pieces 17 are made of polytetrafluoroethylene, and the ejection stroke changes linearly with the inflation volume. The air bladder ring 6 with the recessed pieces 17 is located below another air bladder ring 6. The spherical crown-shaped recessed pieces 17 that are connected in sequence make it easy to control the ejection length of the recessed part according to the amount of air injected, thereby improving the accuracy of adjusting the position of the telescopic grouting pipe 5. The adjustment is delicate and the stroke is controllable, which further improves the orientation accuracy of the pipe opening and can be adapted to grouting of extremely small gaps.

[0030] In this embodiment, a camera 18 is installed at the bottom of the retractable grouting pipe 5. The camera 18 is an IP68 waterproof infrared camera with a built-in LED fill light. The other end of the camera 18 is connected to a display terminal, which is a 7-inch industrial touch screen mounted on a mobile base 1. The camera 18 can be equipped with a light source or be an infrared camera, so that the user can view the image acquired by the camera 18 through the display terminal. This makes it easier to adjust the position of the pipe opening of the retractable grouting pipe 5 according to the position of the gap seen. Visual real-time monitoring avoids blind grouting and greatly improves the accuracy of gap positioning and the success rate of grouting.

[0031] In this embodiment, a cleaning brush 19 is installed on the outer side of the bottom end of the retractable grouting pipe 5. The cleaning brush 19 is made of hard nylon bristles and wraps around the camera 18 in a ring. The camera 18 is located inside the cleaning brush 19, which can protect the camera 18. In addition, the symmetrical air bladder 7 is alternately inflated and deflated (e.g., Figure 4 As shown, for example, the two air chambers 7 on the left and the two air chambers 7 on the right are inflated in sequence, with an alternation frequency of 1 time / second, to realize the swing of the opening of the telescopic grouting pipe 5. Together with the cleaning brush 19, the internal gravel is cleaned, making it easier for the telescopic grouting pipe 5 to penetrate into the gap; effectively removing debris from the gap, preventing the pipe from getting stuck, while protecting the camera, and improving the smoothness of pipe insertion and equipment reliability.

[0032] The method of using the grouting device for embankment voids includes the following steps: Installation: Insert the outer sleeve into the opening of the cavity in the embankment, unfold the support frame 16 to fix the position of the outer sleeve, and turn on the camera 18 to observe the internal condition of the cavity; quickly locate and explore the internal condition in advance, shorten the construction preparation time, and lay the foundation for precise grouting; Grouting: Start the grout delivery pump 3, open the corresponding solenoid valve, and deliver grout to the rigid grouting pipe 4 and several flexible and telescopic grouting pipes 5 towards the cavity; large cavities and small gaps are filled simultaneously, which greatly shortens the grouting period and improves the overall construction efficiency. Posture adjustment: Vertical position adjustment: Push slider 14 to stretch telescopic grouting pipe 5, adjust its bottom end to the target depth in the cavity, and lock slider 14 after positioning; full depth coverage grouting to avoid deep leakage and ensure the integrity of cavity filling. Tilt position adjustment: Inflate the corresponding number of air bladders 7 on the same side of the telescopic grouting pipe 5. By filling the concave part with air, the concave part expands in the direction of the telescopic grouting pipe 5, causing the telescopic grouting pipe 5 to shift in the direction of force, thus completing the tilt position adjustment. The inflation pressure is controlled at 0.3-0.5MPa; it can accurately adapt to lateral bending gaps and achieve grouting without dead angles in irregular cavities. Adjusting the shape of the retractable grouting pipe 5: Inflating the symmetrical air bladder 7 (e.g.) Figure 4 As shown, by simultaneously inflating the air bladder 7 on both sides or on both the top and bottom sides, the air bladder 7 can slightly compress the opening of the retractable grouting pipe 5, shaping the circular opening into an elliptical shape. Unlike inflating only one side of the air bladder 7, simultaneous inflation on both sides can compress and shape the opening of the retractable grouting pipe 5, making it easier for the opening of the retractable grouting pipe 5 to pass through small gaps. The compression force is controllable and does not clog the grout. After the opening is shaped, the cross-section is smaller, and the passage rate of small gaps is significantly improved, completely solving the problem that traditional devices cannot penetrate into micro gaps. Cleaning debris: The symmetrical air chamber 7 is alternately inflated and deflated to enable the swing of the retractable grouting pipe 5, which drives the cleaning brush 19 to clean the internal gravel, clearing obstacles for grouting; removing blockages and debris, ensuring smooth insertion of the pipe and smooth flow of grout, and improving the smoothness of grouting construction.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A grouting device for embankment cavities, comprising a movable base, a grout container and a grout delivery pump mounted on top of the movable base, and a grouting pipe assembly, wherein the grout container is connected to the grouting pipe assembly via the grout delivery pump and pipeline, characterized in that: The grouting assembly includes: The outer casing contains a rigid grouting pipe and several flexible, extendable grouting pipes. Two interconnected airbag rings are fitted on the outer side of the end of the retractable grouting pipe away from the grout delivery pump. The airbag rings are installed on the outside of the retractable grouting pipe through elastic connectors. The airbag rings are provided with annular array of airbag cavities. An inflation pipeline system is provided on the airbag rings.

2. The grouting device for embankment cavities according to claim 1, characterized in that: One of the airbag rings has an inner ring size that matches the outer ring size of the telescopic grouting pipe, and the inner part of the other airbag ring is recessed towards the center of the airbag cavity, and the number of recesses is the same as the number of airbag cavities, and their positions correspond to each other.

3. The grouting device for embankment cavities according to claim 1, characterized in that: The elastic connector includes a fixing block installed at the end of the telescopic grouting pipe and an elastic rope connected to the fixing block, the other end of which is connected to the outside of the airbag ring.

4. The grouting device for embankment cavities according to claim 2, characterized in that: The retractable grouting pipe includes a flexible pipe section and a telescopic pipe section. The telescopic pipe section is a corrugated pipe, which is located inside the upper part of the outer sleeve. Its upper end is connected to the grout delivery pump through a pipeline, and its lower end is connected to the flexible pipe section. A slider is installed on the outside of the flexible pipe section, and a sliding groove is opened on the outside of the outer sleeve, which extends into the inner cavity of the outer sleeve. The slider is slidably connected to the sliding groove.

5. The grouting device for embankment cavities according to claim 1, characterized in that: The rigid grouting pipe is fixedly installed inside the outer sleeve by a connecting rod. Several embedding grooves are opened on the outer side of the rigid grouting pipe, and the telescopic grouting pipe is embedded in the corresponding embedding groove.

6. The grouting device for embankment cavities according to claim 1, characterized in that: A support frame is installed on the outside of the outer sleeve, and the support frame is used to support the outer sleeve to grout the cavity.

7. The grouting device for embankment cavities according to claim 1, characterized in that: The airbag has eight cavities, which divide the airbag ring into eight equal parts. The recessed area includes several spherical concave pieces that are stacked and connected in sequence, and the airbag ring with the concave pieces is located below another airbag ring.

8. The grouting device for embankment cavities according to claim 1, characterized in that: A camera is installed at the bottom of the retractable grouting pipe, and the other end of the camera is connected to a display terminal.

9. The grouting device for embankment cavities according to claim 8, characterized in that: A cleaning brush with hard bristles is installed on the outer side of the bottom end of the retractable grouting pipe, and the camera is located inside the cleaning brush.

10. A method for using a grouting device for embankment voids, employing the grouting device for embankment voids as described in any one of claims 1-9, characterized in that: Includes the following steps: Installation: Install the outer sleeve into the opening; Grouting: The grout delivery pump is activated to deliver grout to the rigid grouting pipe and several flexible, extendable grouting pipes toward the cavity; Posture adjustment: Vertical position adjustment: Extend the telescopic grouting pipe to adjust the depth of its bottom end in the cavity; Tilt position adjustment: Inflate the corresponding number of air bladders. By filling the concave part with air, the concave part expands in the direction of the retractable grouting pipe, causing the retractable grouting pipe to shift in the direction of force, thus completing the tilt position adjustment. Adjustment of the shape of the retractable grouting pipe opening: Inflate the symmetrical air bladder cavity to compress the retractable grouting pipe opening, thereby facilitating the passage of the retractable grouting pipe opening through narrow gaps. Cleaning debris: Alternately inflate and deflate the symmetrical air bladder cavities to allow the retractable grouting pipe opening to swing and clean the internal gravel.

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