A new umbrella-shaped elastic expansion plug

Abstract

The utility model discloses a novel umbrella -like elastic expansion plug, including the cover cylinder of pre -buried in shield pipe piece bolt hole, the expansion bolt of penetrating cover cylinder and the expansion plug of pushable in expansion bolt, cover cylinder contains cover cylinder main part and base, and the inner wall is equipped with encircles the clamping groove, expansion bolt has the disc, hollow pipeline, the fan -shaped body card block of elastic expansion and dam -like rubber body, expansion plug is umbrella -like elastic structure, is composed of conical high -performance rubber and cylindrical rubber, has corrosion -resistant, anti -aging, has multiple specifications, when installing, expansion plug pushes in and props open fan -shaped body card block, embeds cover cylinder clamping groove, dam -like rubber body limit, forms multiple seals, can replace alone when maintaining, improves waterproof reliability.

Description

Technical Field

[0001] This utility model relates to the field of tunnel waterproofing technology, specifically to a novel umbrella-shaped elastic expansion plug. Background Technology

[0002] In shield tunnel construction, the segment is the core component of the tunnel structure. The waterproof performance of its joints directly affects the safety and service life of the tunnel. Traditional shield segments are mostly fixed by bolts. However, due to factors such as assembly gaps, material differences, and long-term dynamic stress, the bolt joints become weak links in the waterproof system and are prone to leakage.

[0003] Currently, the new type of tensile-blocking shield tunnel segment joint waterproof structure improves the waterproof effect to a certain extent by setting moisture-resistant inner pads, anti-residual water grooves, and reserved circular grooves, combined with specific materials and processes.

[0004] However, the existing new tensile-blocking shield segment joint waterproof structure still has many limitations in practical applications, especially in terms of waterproof reliability and long-term maintenance, so there is room for improvement. Utility Model Content

[0005] To address the problems mentioned in the background section, this application provides a novel umbrella-shaped elastic expansion plug.

[0006] This application provides a novel umbrella-shaped elastic expansion plug using the following technical solution:

[0007] A novel umbrella-shaped elastic expansion plug includes a cover, an expansion bolt, and an expansion plug. The cover is pre-embedded in the bolt holes of the tunnel segment and includes a cover body and a base. The cover body is a hollow cylindrical structure that matches the outer shell of the expansion bolt so that the expansion bolt can enter the cover body. The base is fixedly connected to the lower end of the cover body to increase the connection strength between the cover and the tunnel segment. The expansion bolt passes through the cover. The expansion bolt is provided with a base plate, an axially penetrating hollow pipe, and a sector-shaped locking block. The base plate is fixedly connected to the lower end of the hollow pipe. The sector-shaped locking blocks are evenly distributed on the inner wall of the upper end of the hollow pipe and can elastically expand outward. The expansion plug is made of elastic material and has expansion capacity and compression resilience. The expansion plug is pushed into the hollow pipe from the bottom of the expansion bolt. When the expansion plug enters the middle of the sector-shaped locking block, it opens the sector-shaped locking block.

[0008] By adopting the above technical solution, a tight fit and synergistic effect between the cover, expansion bolts, and expansion plug can be achieved, forming a reliable sealing structure at the bolt hole position of the shield tunnel segment. The cover is pre-embedded in the bolt hole, and the base enhances the connection strength with the segment, providing a stable foundation for the overall structure. The hollow cylindrical cover body matches the outer shell of the expansion bolt, ensuring that the expansion bolt can be smoothly inserted and initially positioned. The fan-shaped locking block of the expansion bolt is opened when the expansion plug is pushed in, forming a firm engagement with the inner wall of the cover. At the same time, the expansion plug is made of elastic material and has expansion capacity and compression resilience. After entering the hollow pipe, it can fit tightly against the inner wall of the pipe. The elasticity of the material itself further enhances the sealing effect, effectively blocking the path of water leakage through the bolt hole, improving the waterproof performance of the tunnel. The installation method of the expansion plug is simple. Assembly can be completed by pushing it in from the bottom of the expansion bolt. No complicated operation is required, reducing the dependence on the precision of construction personnel and improving installation efficiency.

[0009] Optionally, the cover cylinder is further provided with a circumferential groove, which is evenly distributed on the inner wall of the cover cylinder body and matches the fan-shaped locking block on the expansion bolt, for locking the fan-shaped locking block of the expansion bolt.

[0010] By adopting the above technical solution, the circumferential groove on the inner wall of the cover matches the sector-shaped locking block of the expansion bolt. When the expansion plug is pushed into the hollow pipe and opens the sector-shaped locking block, the locking block can be precisely embedded in the groove to form a mechanical locking structure. This fit not only enhances the connection stability between the expansion bolt and the cover, preventing relative displacement between the two under the vibration and stress of tunnel operation, but also further seals any possible gaps through the tight engagement of the locking block and the groove, reducing the risk of water leakage from the component connection. This locking method makes the positioning of the expansion bolt in the cover more accurate, reducing the sealing failure problem caused by position deviation during installation, and maintaining the integrity of the structure during long-term use, reducing maintenance needs caused by loosening, thereby improving the reliability and durability of the entire waterproof system.

[0011] Optionally, the expansion bolt may further include a dam-shaped rubber body for securing the expansion plug.

[0012] By adopting the above technical solution, the dam-shaped rubber body on the expansion bolt can effectively secure the expansion plug. When the expansion plug is pushed into the hollow pipe of the expansion bolt and unfolds, the dam-shaped rubber body makes close contact with the expansion plug through its own elasticity, restricting the axial displacement of the expansion plug in the pipe and preventing it from loosening or falling off due to tunnel vibration, water flow impact or long-term stress. This ensures that the expansion plug is always in the preset position to maintain a sealed state. The fit between the dam-shaped rubber body and the expansion plug can also further fill any possible tiny gaps between them, enhancing the sealing layer between the expansion plug and the expansion bolt. Combined with the elastic expansion performance of the expansion plug itself, multiple waterproof barriers are formed, reducing the possibility of water leakage from the gap between the expansion plug and the inner wall of the pipe.

[0013] Optionally, the elastic material used for the expansion plug also has corrosion resistance and aging resistance, and can withstand external forces and environmental stresses during installation and use to prevent cracking and damage.

[0014] By adopting the above technical solution, the expansion plug uses an elastic material with corrosion resistance and anti-aging properties, which can effectively resist corrosion and erosion in the complex environment of the tunnel, slow down the aging rate of the material. This material can withstand the pushing force during installation, the stress generated by tunnel vibration during use, and the stress caused by changes in ambient temperature and humidity, avoiding cracking and damage caused by external forces or environmental factors. This ensures that the expansion plug maintains its complete structural shape and elastic performance for a long time, ensuring that the tight fit between it and the expansion bolt and cover is not damaged, continuously playing a sealing and waterproof role, extending the service life of the expansion plug, reducing the need for frequent replacement due to material failure, reducing maintenance costs, and improving the stability and reliability of the entire waterproof system in long-term operation.

[0015] Optionally, the expansion plug has an overall umbrella-shaped structure, including a high-performance rubber in the shape of a conical hat at the top and a cylindrical rubber at the bottom.

[0016] By adopting the above technical solution, the umbrella-shaped structure of the expansion plug consists of an upper part of high-performance rubber in the shape of a hat and a lower part of cylindrical rubber. When the expansion plug is pushed into the hollow pipe of the expansion bolt, the lower part of cylindrical rubber provides a stable guiding effect, ensuring a smooth and precise installation process. When the upper part of high-performance rubber in the shape of a hat enters the pipe and contacts the fan-shaped locking block, its special shape can evenly distribute the force and efficiently open the locking block, causing the locking block to tightly engage with the surrounding groove of the cover. At the same time, after the hat-shaped structure unfolds, it forms a large area of ​​tight fit with the inner wall of the pipe. Combined with the filling of the space below by the cylindrical rubber, it can seal the existing gaps in multiple layers and enhance the overall sealing effect.

[0017] Optionally, the expansion plug is available in various specifications and models to meet the usage requirements of different sized covers and expansion bolts.

[0018] By adopting the above technical solutions, the various specifications and models of expansion plugs can be flexibly adapted to cover cylinders and expansion bolts of different sizes. When facing different geological conditions, tunnel design standards or non-standard components, precise matching can be achieved without additional customization and modification. This not only improves versatility and on-site adaptability, and reduces installation conflicts or sealing failures caused by specification mismatch, but also reduces the complexity and cost added to the project to adapt to special working conditions. It also provides more choices for construction, making it easier to quickly select the appropriate expansion plug according to actual needs, shorten the selection and installation cycle, improve construction efficiency, and thus enhance the applicability and promotion of the entire waterproofing system in diverse engineering scenarios.

[0019] Optionally, the expansion plug can be removed and replaced separately during maintenance without disassembling the cover or bolts.

[0020] By adopting the above technical solution, the expansion plug can be removed and replaced individually during maintenance without disassembling the cover or bolts. This design greatly simplifies the maintenance process, reduces the interference of maintenance operations on the surrounding structure, avoids damage to structural stability caused by disassembling the cover or bolts, reduces the impact on tunnel operation safety during maintenance, and shortens maintenance time by eliminating complicated disassembly steps, reducing project downtime, reducing labor and equipment investment costs. Moreover, the individual replacement method makes the replacement of damaged parts more precise and efficient, avoiding the material waste caused by overall replacement, which is in line with the concept of green engineering.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. Through the precise engagement of the cover sleeve surrounding the slot and the expansion bolt fan-shaped block, combined with the elastic sealing of the expansion plug and the limiting effect of the dam-shaped rubber body, multiple waterproof barriers are formed, which significantly improves the waterproof reliability of the shield tunnel segment bolt hole and effectively blocks the water leakage path.

[0023] 2. The umbrella-shaped structure design and various specifications of the expansion plug not only simplify the installation process and reduce the dependence on construction accuracy, but also flexibly adapt to different working conditions, reducing the complexity and cost of the project caused by insufficient adaptability.

[0024] 3. Through material selection and structural optimization, the expansion plug is made corrosion-resistant, anti-aging, and dynamically adaptable, which can maintain stable performance in the complex environment of the tunnel for a long time, reduce maintenance needs caused by material failure or structural loosening, and extend the service life of the waterproof system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the cover structure of a novel umbrella-shaped elastic expansion plug according to this utility model;

[0026] Figure 2This is a cross-sectional view of the cover of a novel umbrella-shaped elastic expansion plug according to this utility model;

[0027] Figure 3 This is a schematic diagram of the unexpanded structure of the expansion bolt of a novel umbrella-shaped elastic expansion plug according to this utility model.

[0028] Figure 4 This is a cross-sectional view of the expansion bolt of a novel umbrella-shaped elastic expansion plug according to this utility model before expansion.

[0029] Figure 5 This is a schematic diagram of the expanded bolt structure of a novel umbrella-shaped elastic expansion plug according to this utility model after expansion.

[0030] Figure 6 This is a cross-sectional view of the expansion bolt of a novel umbrella-shaped elastic expansion plug according to this utility model after expansion;

[0031] Figure 7 This is a schematic diagram of the expansion plug structure of a novel umbrella-shaped elastic expansion plug according to this utility model.

[0032] Among them, 1. Cover cylinder; 10. Cover cylinder body; 11. Base; 12. Surrounding slot; 2. Expansion bolt; 20. Chassis; 21. Hollow pipe; 22. Fan-shaped block; 23. Dam-shaped rubber body; 3. Expansion plug; 30. Hat-shaped high-performance rubber; 31. Lower cylindrical rubber. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0034] This application discloses a novel umbrella-shaped elastic expansion plug.

[0035] Reference Figure 1 and Figure 2 The cover 1, as the basic component of the new umbrella-shaped elastic expansion plug 3, includes a cover body 10 and a base 11. The cover body 10 is a hollow cylindrical structure with an inner wall size that matches the outer shell of the expansion bolt 2, ensuring that the expansion bolt 2 can be smoothly inserted and accurately positioned. The base 11 is fixedly connected to the lower end of the cover body 10 and adopts a size design that matches the bolt holes of the shield tunnel segment. During the pre-embedding process, the base 11 is tightly bonded to the concrete of the tunnel segment, and the connection strength between the cover 1 and the tunnel segment is improved by increasing the contact area, thus avoiding loosening due to vibration or stress during long-term use.

[0036] The inner wall of the cover body 10 has a circumferential groove 12. The position and shape of the circumferential groove 12 correspond to the fan-shaped locking block 22 on the expansion bolt 2. When the expansion bolt 2 enters the cover body 10, the fan-shaped locking block 22 expands outward under the action of the expansion plug 3 and embeds itself into the circumferential groove 12, forming a stable mechanical lock to prevent the expansion bolt 2 from shifting in the axial and radial directions. The tight engagement between the fan-shaped locking block 22 and the circumferential groove 12 seals the gap between them, further enhancing the reliability of the waterproof seal. The overall structure of the cover 1 is made of high-strength corrosion-resistant material, which can adapt to the complex environment of dampness and erosion in the tunnel, ensuring the stability of the structural performance during long-term use and providing a solid foundation for the entire waterproof system.

[0037] Reference Figure 3 and Figure 4 The expansion bolt 2 has a compact structure in its unexpanded state, including a base 20, a hollow pipe 21, a fan-shaped locking block 22, and a dam-shaped rubber body 23. The base 20 is fixedly connected to the lower end of the hollow pipe 21. The overall structure is adapted to the size of the cover 1 so that it can be smoothly inserted into the inside of the cover 1. The hollow pipe 21 is an axially penetrating channel that provides a path for the expansion plug 3 to be pushed in. The fan-shaped locking block 22 is distributed on the inner wall of the upper end of the hollow pipe 21 and is in a contracted state without expansion. There is a certain gap between the outer side of the fan-shaped locking block 22 and the inner wall of the cover body 10, and it does not form an engagement with the surrounding locking groove 12 of the cover 1. The dam-shaped rubber body 23 is set inside the hollow pipe 21, below the fan-shaped locking block 22, and has an annular protrusion structure. It remains in its natural state when the expansion plug 3 is not installed. Its inner diameter is slightly smaller than the outer diameter of the cylindrical rubber of the expansion plug 3, which is to prepare for the subsequent locking of the expansion plug 3.

[0038] Reference Figure 5 and Figure 6 When the expansion bolt 2 is in an expanded state, it exhibits a completely different structural form from when it is not expanded. When the expansion plug 3 is pushed into the hollow pipe 21 of the expansion bolt 2 from the bottom and reaches the fan-shaped locking block 22 at the top of the hollow pipe 21, the high-performance rubber 30 in the umbrella-shaped structure pushes the fan-shaped locking block 22 outward, so that the fan-shaped locking block 22 is precisely embedded in the surrounding groove 12 on the inner wall of the cover cylinder 1, forming a firm mechanical lock. This locking state not only makes the connection between the expansion bolt 2 and the cover cylinder 1 more stable and effectively avoids the relative displacement of the two due to vibration, stress and other factors during tunnel operation, but also further enhances the overall sealing effect through the tight engagement of the locking block and the groove.

[0039] The dam-shaped rubber body 23 inside the hollow pipe 21 undergoes elastic deformation under the action of the expansion plug 3, locking the hat-shaped high-performance rubber 30 part of the expansion plug 3, restricting the movement of the expansion plug 3 in the axial direction, ensuring that the expansion plug 3 is always in the preset sealing position, and avoiding the impact on waterproof performance due to loosening. The hat-shaped high-performance rubber 30 of the expansion plug 3 is fully expanded and tightly fits against the inner wall of the hollow pipe 21. With the help of the material's own elasticity, pressure is continuously applied. Even when there are slight changes in the tunnel environment, it can maintain a good sealing state through its own deformation. After expansion, the entire structure forms a multi-layered and synergistic waterproof barrier, providing reliable waterproof protection for the bolt hole area of ​​the shield tunnel segment.

[0040] Reference Figure 7 The expansion plug 3 has an umbrella-like structure, consisting of an upper part of a conical high-performance rubber 30 and a lower part of a cylindrical rubber 31. Both are manufactured using an integrated molding process to ensure structural integrity and stability. The conical high-performance rubber 30, located at the top of the expansion plug 3, possesses excellent elasticity and expansion capacity. The cylindrical rubber portion, with its cylinder facing upwards, is first pushed into the hollow channel 21 of the expansion bolt 2, acting as a guide during insertion to ensure the expansion plug 3 accurately enters the designated position. When the conical high-performance rubber 30 contacts the fan-shaped locking block 22 of the expansion bolt 2, it begins to gradually expand outwards. Its unique umbrella-like design makes the force more even, efficiently opening the fan-shaped locking block 22. After the rubber 30 unfolds, it forms a large and tight fit with the inner wall of the pipe, effectively sealing any possible gaps and further enhancing the overall sealing effect. The lower cylindrical rubber 31 fills the space above and works in conjunction with the high-performance conical rubber 30 to seal any gaps in multiple layers, ensuring the best sealing effect. The entire expansion plug 3 is made of an elastic material with corrosion resistance and anti-aging properties. The material's characteristics make it less prone to cracking or damage when subjected to the pushing force during installation and environmental stress during use. It has good compression resilience and can produce appropriate deformation when in contact with the inner wall of the pipe, the fan-shaped clamp 22, and the dam-shaped rubber body 23, together achieving the sealing and fixing functions and meeting the stringent requirements of tunnel waterproofing.

[0041] The implementation principle of the novel umbrella-shaped elastic expansion plug 3 in this application embodiment is as follows:

[0042] The cover 1, as the basic support body, is pre-embedded in the bolt holes of the shield tunnel segment. The circumferential groove 12 set on its inner wall forms a precise fit with the fan-shaped locking block 22 of the expansion bolt 2. When the expansion plug 3 is pushed into the hollow pipe 21 of the expansion bolt 2, its hat-shaped upper structure will gradually open the elastic fan-shaped locking block 22 on the upper part of the hollow pipe 21, forcing the fan-shaped locking block 22 to expand outward and embed into the circumferential groove 12 on the inner wall of the cover 1, realizing the mechanical self-locking function. During this process, the elastic material of the expansion plug 3 itself expands radially due to pressure, forming an interference fit seal with the inner wall of the pipe. The dam-shaped rubber body 23 inside the expansion bolt 2 forms an axial limit on the expansion plug 3, preventing it from loosening and displacing. The whole process utilizes the combination of structural design and material properties to take into account waterproof reliability, installation convenience and maintenance economy, and adapt to the long-term use needs in the complex environment of the tunnel.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel umbrella-shaped elastic expansion plug (3), characterized in that: The system includes a cover (1), expansion bolts (2), and expansion plugs (3). The cover (1) is pre-embedded in the bolt holes of the tunnel segment. It includes a cover body (10) and a base (11). The cover body (10) is a hollow cylindrical structure that matches the outer shell of the expansion bolts (2) so that the expansion bolts (2) can enter the cover body (10). The base (11) is fixedly connected to the lower end of the cover body (10) to increase the connection strength between the cover (1) and the tunnel segment. The expansion bolts (2) penetrate the cover (1) and are equipped with a base plate. (20), an axially penetrating hollow pipe (21) and a fan-shaped clamping block (22), the chassis (20) is fixedly connected to the lower end of the hollow pipe (21), the fan-shaped clamping block (22) is evenly distributed on the inner wall of the upper end of the hollow pipe (21), and the fan-shaped clamping block (22) can expand elastically outward, the expansion plug (3) is made of elastic material, has expansion capacity and compression resilience, the expansion plug (3) is pushed into the hollow pipe (21) from the bottom of the expansion bolt (2), and when the expansion plug (3) enters the middle of the fan-shaped clamping block (22), it opens the fan-shaped clamping block (22).

2. The novel umbrella-shaped elastic expansion plug (3) according to claim 1, characterized in that: The cover (1) is also provided with a surrounding groove (12), which is evenly distributed on the inner wall of the cover body (10) and matches the fan-shaped locking block (22) on the expansion bolt (2) to lock the fan-shaped locking block (22) of the expansion bolt (2).

3. The novel umbrella-shaped elastic expansion plug (3) according to claim 1, characterized in that: The expansion bolt (2) also includes a dam-shaped rubber body (23) for locking the expansion plug (3).

4. The novel umbrella-shaped elastic expansion plug (3) according to claim 1, characterized in that: The expansion plug (3) is made of an elastic material that is corrosion resistant and anti-aging, and can withstand external forces and environmental stresses during installation and use to prevent cracking and damage.

5. The novel umbrella-shaped elastic expansion plug (3) according to claim 1, characterized in that: The expansion plug (3) has an umbrella-shaped structure, including a high-performance rubber (30) in the shape of a hat in the upper part and a cylindrical rubber (31) in the lower part.

6. The novel umbrella-shaped elastic expansion plug (3) according to claim 1, characterized in that: The expansion plug (3) has various specifications and models to meet the usage requirements of different sized covers (1) and expansion bolts (2).

7. The novel umbrella-shaped elastic expansion plug (3) according to claim 1, characterized in that: The expansion plug (3) can be removed and replaced separately during maintenance without disassembling the cover (1) or bolts.

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