Foundation pit plugging and grouting pipe

Abstract

The utility model relates to the technical field of grouting pipe, concretely to a foundation pit plugging grouting pipe, including the pipe body, the surface fixed mounting of pipe body has the connecting pipe and the pipe sharp head, the surface of pipe body is established grouting hole, through setting up the sliding cover screw rod, the sliding cover, the pressing plate screw rod, the filter plate, the pressing plate, the pressure -bearing plate, utilize the synergies of these structures, the sliding cover screw rod drives the sliding cover to slide, the sliding cover is closely combined with the pipe body when closing, prevents the slurry overflow to block the external impurity infiltration, when opening, it is convenient for the filter plate to take out quickly and clean or replace, the filter plate is closely combined with the pressure -bearing plate by the pressing plate screw rod, the filter plate provides stable support with the help of pressure -bearing plate, avoids the filter plate to shift under the slurry impact, also can let the filter plate accurate filtration particle impurity in the slurry, prevents the pipeline blockage, guarantees the grouting pressure stability and grouting passage smooth, has simplified the equipment maintenance process, has promoted the efficiency and reliability of foundation pit plugging grouting construction.

Description

Technical Field

[0001] This utility model relates to the field of grouting pipe technology, and in particular to a foundation pit sealing grouting pipe. Background Technology

[0002] Grouting pipes, a type of construction equipment used to transport grout, are commonly used in building and civil engineering. They primarily function as pressure conveyors, gap fillers, foundation reinforcement, waterproofing and seepage prevention, soil stabilization, structural connections, and seals, effectively improving construction efficiency, ensuring project quality, and extending structural lifespan. Publication number CN217204098U discloses a grouting pipe for pile grouting, relating to the field of grouting pipe technology. The pipe includes a grouting pipe body, with mounting blocks fixed at both ends. A cylinder is fixed to the outer end of each mounting block, and a limit plate is fixed to the outer end of each cylinder. Rotating rods are movably connected to each cylinder, and sliding rods are slidably connected within each rotating rod. The bottom ends of each sliding rod extend beyond the rotating rod and are fixed with connecting blocks. A common collection box is fixed between the two connecting blocks. An abutment rod is fixed to the rear end of the grouting pipe body. This utility model incorporates a collection box, abutment plates, and rotating rods, etc. After grouting is completed, the collection box is positioned below the grouting pipe body. During the movement of the grouting pipe body, any residual grout drips into the collection box, preventing it from dripping directly into the surrounding environment. This avoids the need for manual cleaning of the dripping grout, reducing the labor intensity of workers and preventing grout waste. This utility model, by setting a rotating rod, a limiting plate, and a collection box, allows residual grout to drip into the collection box during the movement of the grouting pipe body, preventing it from dripping directly into the surrounding environment and thus avoiding the need for manual cleaning of the dripping grout and reducing the labor intensity of workers. However, in the face of complex geological conditions in foundation pit sealing scenarios, such as high mud and sand content and high groundwater pressure, it is impossible to filter impurities during the grout transportation process. This results in particulate impurities mixed in the grout easily clogging the grouting holes, affecting the stability of grouting pressure and sealing effect, and impacting grouting efficiency. Improvements are needed. Utility Model Content

[0003] The purpose of this utility model is to solve the technical problems mentioned in the background section.

[0004] This utility model adopts the following technical solution: a grouting pipe for sealing foundation pits, comprising a pipe body, a connecting pipe and a pipe tip fixedly installed on the surface of the pipe body, grouting holes opened on the surface of the pipe body, a pipe tip hole opened on the surface of the pipe tip, a screw block and a sliding block fixedly installed on the surface of the pipe body, a nut rotatably connected inside the screw block, a sliding cover screw rod fixedly installed on the surface of the nut, a sliding cover sliding rod fixedly installed inside the sliding block, a fixing block fixedly installed on the surface of the pipe body, a sliding cover threadedly connected to the surface of the sliding cover screw rod, a sliding rod groove opened on the surface of the sliding cover, a pressure plate, a screw fixing block, and a sliding rod fixing block fixedly installed inside the pipe body, a pressure plate screw rod threadedly connected inside the screw fixing block, a pressure plate sliding rod slidably connected inside the sliding rod fixing block, and a filter plate rotatably connected to the other end of the pressure plate screw rod.

[0005] Preferably, the inner side of the sliding cover and the surface of the pipe body are in contact, and the surface of the filter plate and the surface of the pressure plate are in contact. Here, a tight seal is formed when the sliding cover is closed, effectively preventing mud, sand, and groundwater in the foundation pit from seeping into the grouting pipe through the gap between the sliding cover and the pipe body, avoiding grout overflow during grouting. This ensures stable grouting pressure and provides convenient operating space for opening the sliding cover and removing the filter plate later. The contact between the filter plate and the pressure plate provides stable support for the filter plate, ensuring that the filter plate is not easily displaced when filtering grout impurities. This, combined with the sealing effect of the sliding cover, forms a synergistic effect of filtration sealing and convenient maintenance, improving the overall practicality and construction efficiency of the grouting pipe.

[0006] Preferably, the length of the sliding cover screw is the same as the length of the sliding cover slide rod and they are symmetrically distributed on both sides of the sliding cover. The surface of the sliding cover screw and the interior of the fixing block are rotatably connected. This ensures that the sliding cover is subjected to balanced force on both sides and moves synchronously during the sliding process, avoiding tilting and jamming of the sliding cover due to the difference in length of the components on both sides. This ensures smooth opening and closing of the sliding cover and makes the fit between the sliding cover and the pipe body more uniform, improving the sealing effect. The rotatable connection between the sliding cover screw and the fixing block provides a stable support point for the sliding cover screw, limiting its radial displacement, without affecting the screw's own rotational transmission function. This allows the screw to stably drive the sliding cover to move along the slide rod direction when the nut is turned, achieving precise opening and closing of the sliding cover and meeting the switching requirements for filter plate removal and maintenance and grouting sealing.

[0007] Preferably, the surface of the sliding cover slide rod and the surface of the slide rod groove are slidably connected, and the surface of the pressure plate slide rod and the interior of the filter plate are rotatably connected. Here, precise guidance is provided for the movement of the sliding cover, restricting the sliding cover to slide smoothly only along the axis of the slide rod, avoiding sliding cover deviation that could lead to sealing failure or jamming during opening and closing. The sliding fit reduces the frictional resistance between the two, making the opening and closing of the sliding cover easier. At the same time, the fit between the slide rod and the groove wall also helps to enhance the sealing cooperation between the sliding cover and the pipe body. The pressure plate slide rod ensures that the pressure plate can move up and down with the rotation of the pressure plate screw, so as to adjust the tightness of the fit between the filter plate and the pressure plate, ensuring the filtration effect, and preventing the pressure plate from jamming due to angular deviation, making the up and down movement of the pressure plate smoother.

[0008] Preferably, the surface of the connecting tube is provided with a connecting groove, and a connecting gasket is fixedly installed on the surface of the connecting groove; the surface of the tube body is provided with a tube body groove, and a tube body gasket is fixedly installed on the surface of the tube body groove; the inner side of the sliding cover is provided with a sliding cover groove, and a sliding cover gasket is fixedly installed on the surface of the sliding cover groove. Here, the connecting gasket can be effectively prevented from shifting or falling off when the grouting pipe is connected to the external pipeline. The connecting gasket can fill the gap between the connecting pipe and the external pipeline, blocking the grout from leaking from the interface, while enhancing the sealing and stability of the connection point and preventing the interface from loosening due to pressure impact. The combination of the pipe body groove and the pipe body gasket strengthens the sealing cooperation after the pipe body and the sliding cover are closed. The pipe body groove allows the pipe body gasket to fit tightly against the surface of the pipe body, preventing the gasket from shifting. The sliding cover groove on the inner side of the sliding cover provides fixed support for the sliding cover gasket. When the sliding cover is closed, the sliding cover gasket and the pipe body gasket can form a double sealing structure, improving the sealing performance between the sliding cover and the pipe body, effectively preventing mud, sand and groundwater in the foundation pit from seeping into the grouting hole, and also preventing the grout in the pipe from overflowing, ensuring stable grouting pressure.

[0009] Preferably, both the tube body rubber groove and the sliding cover rubber groove have arc-shaped surfaces, and the surface of the tube body rubber pad and the inner side of the sliding cover rubber pad are in contact. Here, the cylindrical structure that fits the tube body allows the rubber groove to form a more closely fitted relationship with the tube body and the inner side of the sliding cover, avoiding local gaps due to shape mismatch, providing a more complete installation support surface for the rubber pad. The arc-shaped design can disperse the stress of the rubber pad when it is under pressure, preventing the rubber pad from being damaged or deformed due to local stress concentration under long-term use or grouting pressure impact, thus extending the service life of the rubber pad. This allows the two rubber pads to form a seamless sealing surface. Compared with flat contact, the arc-shaped contact has a larger contact area and more uniform sealing performance, which can further prevent the seepage of mud, sand and groundwater in the foundation pit from the rubber pad gaps, while preventing the grout in the tube from overflowing. This ensures the sealing reliability after the sliding cover is closed, and the smooth characteristics of the arc-shaped structure do not affect the sliding operation of the sliding cover, ensuring that while achieving efficient sealing, the convenience of filter plate removal and maintenance is not reduced.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] 1. In this utility model, by setting up a sliding cover screw rod, a sliding cover, a pressure plate screw rod, a filter plate, a pressure plate, and a bearing plate, the sliding cover screw rod drives the sliding cover to slide. When closed, the sliding cover fits tightly with the pipe body, preventing external impurities from seeping in and preventing grout from overflowing. When opened, it is convenient to quickly remove the filter plate for cleaning or replacement. The pressure plate screw rod makes the filter plate fit tightly with the bearing plate, and the bearing plate provides stable support for the filter plate, preventing the filter plate from shifting under the impact of grout. It also allows the filter plate to accurately filter particulate impurities in the grout, prevents pipeline blockage, ensures stable grouting pressure and smooth grouting channel, simplifies equipment maintenance process, and improves the efficiency and reliability of foundation pit sealing grouting construction.

[0012] 2. In this utility model, by setting a connecting groove, a connecting gasket, a pipe body gasket, and a sliding cover gasket, the synergistic effect of these structures is utilized. The connecting groove provides precise installation positioning for the connecting gasket, preventing gasket displacement. The connecting gasket can fill the gap between the connecting pipe and the external pipeline, blocking grout leakage from the interface and ensuring the sealing reliability of the pipeline connection. The pipe body gasket and the sliding cover gasket form a corresponding fit relationship. When the sliding cover is closed, the two are in close contact. Combined with the fit structure between the sliding cover and the pipe body, the sealing effect between the pipe body and the sliding cover is enhanced, effectively preventing mud, sand, and groundwater in the foundation pit from seeping into the grouting hole, while preventing grout from overflowing from the pipe. Attached Figure Description

[0013] Figure 1 A schematic diagram of a foundation pit sealing grouting pipe is provided for this utility model;

[0014] Figure 2 An exploded view of the overall structure of a foundation pit sealing grouting pipe is provided for this utility model;

[0015] Figure 3 This utility model provides a schematic diagram of a sliding door structure for a foundation pit sealing grouting pipe;

[0016] Figure 4 This utility model provides a schematic diagram of a filter plate structure for a foundation pit sealing grouting pipe;

[0017] Figure 5 This utility model presents a schematic diagram of the sealing structure of a foundation pit sealing grouting pipe.

[0018] Legend:

[0019] 1. Pipe body; 2. Connecting pipe; 3. Pipe tip; 4. Grouting hole; 5. Pipe tip hole; 6. Screw block; 7. Sliding rod block; 8. Nut; 9. Sliding cover screw rod; 10. Sliding cover sliding rod; 11. Fixing block; 12. Sliding cover; 13. Sliding rod groove; 14. Pressure plate; 15. Screw fixing block; 16. Sliding rod fixing block; 17. Pressure plate screw rod; 18. Pressure plate sliding rod; 19. Pressure plate; 20. Filter plate; 21. Connecting rubber groove; 22. Connecting rubber gasket; 23. Pipe body rubber groove; 24. Pipe body rubber gasket; 25. Sliding cover rubber groove; 26. Sliding cover rubber gasket. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1

[0023] Please see Figure 1-4This utility model provides a technical solution: a grouting pipe for foundation pit sealing, including a pipe body 1. A connecting pipe 2 and a pipe tip 3 are fixedly installed on the surface of the pipe body 1, which facilitates the insertion of the grouting pipe into a designated position in the foundation pit and reduces insertion resistance. At the same time, the pipe tip hole 5 opened on the surface can assist the grouting hole 4 to achieve multi-directional output of grout, expand the grout diffusion range, and improve the foundation pit sealing effect. The surface of the pipe body 1 has grouting holes 4, and the surface of the pipe tip 3 has pipe tip holes 5. A screw block 6 and a sliding block 7 are fixedly installed on the surface of the pipe body 1. A nut 8 is rotatably connected inside the screw block 6. A sliding cover screw rod 9 is fixedly installed on the surface of the nut 8. The length of the sliding cover screw rod 9 is the same as the length of the sliding cover slide rod 10 and is symmetrically distributed on both sides of the sliding cover 12. The surface of the sliding cover screw rod 9 and the fixed block The internal rotating connection of the sliding cover 12 ensures that the force on both sides of the sliding cover 12 is balanced and the movement trajectory is synchronized during the sliding process. This avoids tilting and jamming of the sliding cover 12 due to the difference in length of the two side components, ensuring smooth opening and closing of the sliding cover 12. At the same time, it makes the fit between the sliding cover 12 and the pipe body 1 more uniform, improving the sealing effect. The rotating connection between the sliding cover screw 9 and the fixing block 11 provides a stable support point for the sliding cover screw 9, limiting its radial displacement, without affecting the rotational transmission function of the screw itself. This allows the screw to stably drive the sliding cover 12 to move along the sliding rod direction when the nut 8 is turned, achieving precise opening and closing of the sliding cover 12. This meets the switching requirements for filter plate 20 removal and maintenance and grouting sealing. The sliding cover sliding rod 10 is fixedly installed inside the sliding rod block 7, and the surface of the pipe body 1 is fixedly installed with... The fixed block 11 and the sliding cover screw 9 are threadedly connected to the sliding cover 12. The inner side of the sliding cover 12 is in contact with the surface of the pipe body 1, and the surface of the filter plate 20 is in contact with the surface of the pressure plate 14. Here, a tight seal can be formed when the sliding cover 12 is closed, effectively preventing mud and sand and groundwater in the foundation pit from seeping into the grouting pipe through the gap between the sliding cover 12 and the pipe body 1, and avoiding grout overflow during grouting. This not only ensures stable grouting pressure, but also leaves convenient operating space for opening the sliding cover 12 to remove the filter plate 20 later. The contact between the filter plate 20 and the pressure plate 14 can provide stable support for the filter plate 20 with the help of the pressure plate 14, ensuring that the filter plate 20 is not easily displaced when filtering grout impurities. This, combined with the sealing effect of the sliding cover 12, forms a synergy of filtration sealing and convenient maintenance. The effect is to improve the overall practicality and construction efficiency of the grouting pipe. The surface of the sliding cover 12 is provided with a sliding rod groove 13. The pipe body 1 is fixedly installed with a pressure plate 14, a screw fixing block 15, and a sliding rod fixing block 16. The screw fixing block 15 is internally threaded with a pressure plate screw rod 17. The sliding rod fixing block 16 is internally slidably connected with a pressure plate sliding rod 18. The surface of the sliding cover sliding rod 10 and the surface of the sliding rod groove 13 are slidably connected. The surface of the pressure plate sliding rod 18 and the interior of the filter plate 20 are rotatably connected. Here, precise guidance is provided for the movement of the sliding cover 12, restricting the sliding cover 12 to slide smoothly only along the axis of the sliding rod, avoiding the sliding cover 12 from deviating and causing sealing failure or jamming during opening and closing. The sliding fit reduces the frictional resistance between the two, making the opening and closing operation of the sliding cover 12 easier.Meanwhile, the fit between the sliding rod and the tank wall also helps to enhance the sealing performance between the sliding cover 12 and the pipe body 1. The pressure plate sliding rod 18 ensures that the pressure plate can move up and down with the rotation of the pressure plate screw 17, so as to adjust the tightness of the fit between the filter plate 20 and the pressure plate 14, ensuring the filtration effect, and preventing the pressure plate from getting stuck due to angular deviation, making the up and down movement of the pressure plate smoother. The other end of the pressure plate screw 17 is rotatably connected to the filter plate 20, which can filter particulate impurities in the slurry, prevent impurities from entering the inside of the pipe body 1 and clogging the grouting hole 4, the pipe tip hole 5 or the external pipeline, ensuring smooth grouting channel. At the same time, it can be removed for maintenance by opening the sliding cover 12, ensuring long-term filtration effect, and is a key component to ensure the purity of the slurry.

[0024] Example 2

[0025] Please see Figure 5The surface of the connecting pipe 2 is provided with a connecting groove 21, and a connecting gasket 22 is fixedly installed on the surface of the connecting groove 21. The surface of the pipe body 1 is provided with a pipe body groove 23, and a pipe body gasket 24 is fixedly installed on the surface of the pipe body groove 23. The inner side of the sliding cover 12 is provided with a sliding cover groove 25, and a sliding cover gasket 26 is fixedly installed on the surface of the sliding cover groove 25. Here, the connecting gasket 22 can be effectively prevented from shifting or falling off when the grouting pipe is connected to the external pipeline. The connecting gasket 22 can fill the gap between the connecting pipe 2 and the external pipeline, and block the grout from leaking from the joint. This enhances the sealing and stability of the mating parts, preventing loosening of the interface due to pressure impact. The combination of the tube body groove 23 and the tube body gasket 24 strengthens the sealing synergy after the tube body 1 and the sliding cover 12 are closed. The tube body groove 23 allows the tube body gasket 24 to fit tightly against the surface of the tube body 1, preventing gasket displacement. The sliding cover groove 25 on the inner side of the sliding cover 12 provides fixed support for the sliding cover gasket 26. When the sliding cover 12 is closed, the sliding cover gasket 26 and the tube body gasket 24 can form a double sealing structure, improving the sealing performance between the sliding cover 12 and the tube body 1, and effectively preventing... The seepage of mud, sand, and groundwater into the grouting hole 4 within the foundation pit also prevents the grout from overflowing from the pipe, ensuring stable grouting pressure. The surfaces of the pipe body rubber groove 23 and the sliding cover rubber groove 25 are both arc-shaped. The surface of the pipe body rubber pad 24 and the inner side of the sliding cover rubber pad 26 are in close contact. Here, the cylindrical structure of the pipe body 1 is matched, allowing the rubber groove to form a more fitting relationship with the pipe body 1 and the inner side of the sliding cover 12, avoiding local gaps due to shape mismatch, and providing a more complete installation support surface for the rubber pad. The arc-shaped design can disperse the stress on the rubber pad under pressure, preventing the rubber pad from fading during long-term use. Under the impact of grouting pressure, damage or deformation may occur due to local stress concentration. This extends the service life of the rubber gasket and allows the two rubber gaskets to form a seamless sealing surface. Compared with flat bonding, the arc-shaped bonding has a larger contact area and more uniform sealing performance. It can further prevent mud and sand and groundwater in the foundation pit from seeping in through the gaps in the rubber gasket, while preventing the grout in the pipe from overflowing. This ensures the sealing reliability of the sliding cover 12 after it is closed. Due to the smooth characteristics of the arc-shaped structure, it will not affect the sliding operation of the sliding cover 12, ensuring that while achieving efficient sealing, the convenience of removing and maintaining the filter plate 20 is not reduced.

[0026] Working Principle: When facing complex geological conditions in foundation pit sealing scenarios, such as high silt content and high groundwater pressure, it is necessary to filter impurities during the grout transportation process to prevent particulate impurities mixed in the grout from clogging the grouting holes and affecting the stability of grouting pressure and sealing effect. The grouting pipe is inserted into the foundation pit through the pipe tip 3 and connected to the external grouting equipment through the connecting pipe 2. The connecting rubber gasket 22 achieves interface sealing. Rotating the pressure plate screw 17 pushes the pressure plate 19 to move along the pressure plate slide rod 18 towards the pressure plate 14 until the filter plate 20 is in contact with the pressure plate 14 to form a filter structure. Rotating the nut 8 causes the sliding cover screw 9 to rotate under the support of the screw block 6 and the fixed block 11, driving the sliding cover. 12 slides and closes along the sliding cover rod 10. At this time, the pipe body rubber gasket 24 and the sliding cover rubber gasket 26 are in contact, realizing the seal between the pipe body 1 and the sliding cover 12. During grouting, the grout enters the pipe body 1 through the connecting pipe 2, first filters impurities through the filter plate 20, and then injects into the foundation pit through the grouting hole 4 and the pipe tip hole 5. During the process, the sealing of the sliding cover 12 and the synergistic effect of each rubber gasket can prevent groundwater and mud from seeping in and the grout from overflowing, ensuring stable grouting pressure. If the filter plate 20 needs to be cleaned, turn the nut 8 in the opposite direction to open the sliding cover 12, and then turn the pressure plate screw 17 in the opposite direction to separate the filter plate 20 from the pressure plate 14. The filter plate 20 can then be taken out for maintenance, which improves the efficiency and reliability of the foundation pit sealing grouting construction.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A foundation pit plugging and grouting pipe comprising a pipe body (1), characterized in that: A connecting pipe (2) and a pipe tip (3) are fixedly installed on the surface of the pipe body (1). A grouting hole (4) is opened on the surface of the pipe body (1). A pipe tip hole (5) is opened on the surface of the pipe tip (3). A lead screw block (6) and a sliding block (7) are fixedly installed on the surface of the pipe body (1). A nut (8) is rotatably connected inside the lead screw block (6). A sliding cover lead screw (9) is fixedly installed on the surface of the nut (8). A sliding cover slide rod (10) is fixedly installed inside the sliding block (7). The surface of the pipe body (1) is fixedly... A fixing block (11) is installed, and a sliding cover (12) is threadedly connected to the surface of the sliding cover screw (9). A sliding rod groove (13) is opened on the surface of the sliding cover (12). A pressure plate (14), a screw fixing block (15), and a sliding rod fixing block (16) are fixedly installed inside the tube body (1). A pressure plate screw (17) is threadedly connected inside the screw fixing block (15), and a pressure plate sliding rod (18) is slidably connected inside the sliding rod fixing block (16). A filter plate (20) is rotatably connected to the other end of the pressure plate screw (17).

2. The foundation pit plugging and grouting pipe according to claim 1, characterized in that: The inner side of the sliding cover (12) and the surface of the tube body (1) are in contact with each other, and the surface of the filter plate (20) and the surface of the pressure plate (14) are in contact with each other.

3. The foundation pit plugging and grouting pipe according to claim 1, characterized in that: The length of the sliding cover screw (9) is the same as the length of the sliding cover slide rod (10) and they are symmetrically distributed on both sides of the sliding cover (12). The surface of the sliding cover screw (9) and the interior of the fixing block (11) are rotatably connected.

4. The foundation pit plugging and grouting pipe according to claim 1, characterized in that: The surface of the sliding cover slide rod (10) and the surface of the slide rod groove (13) are slidably connected, and the surface of the pressure plate slide rod (18) and the interior of the filter plate (20) are rotatably connected.

5. The foundation pit plugging slip casting pipe according to claim 1, characterized in that: The surface of the connecting pipe (2) is provided with a connecting groove (21), and a connecting pad (22) is fixedly installed on the surface of the connecting groove (21). The surface of the pipe body (1) is provided with a pipe body groove (23), and a pipe body pad (24) is fixedly installed on the surface of the pipe body groove (23). The inner side of the sliding cover (12) is provided with a sliding cover groove (25), and a sliding cover pad (26) is fixedly installed on the surface of the sliding cover groove (25).

6. The foundation pit plugging slip casting pipe according to claim 5, characterized in that: The surfaces of the tube body rubber groove (23) and the sliding cover rubber groove (25) are both arc-shaped, and the surface of the tube body rubber pad (24) and the inner side of the sliding cover rubber pad (26) are in contact.

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