A structure and construction method for sealing pre-reserved holes in sandwich-insulated exterior walls

Abstract

This invention discloses a structure and construction method for sealing pre-reserved holes in sandwich-insulated exterior walls, belonging to the field of building construction technology. The structure includes an embedded cylinder, a sealing component, a connecting plate, and a pull-back rod. The inner wall of the embedded cylinder is provided with circumferential flaps; one end of the sealing component has a pull-back ring that hooks and engages with the flaps, and the other end is rotatably equipped with a pull-back plate with an anchor; the connecting plate is installed at the end of the embedded cylinder, and its blind hole has a spiral groove and a constraint groove. During construction, the sealing component is pushed into the embedded cylinder by the pull-back rod, and the pull-back creates a first locking mechanism between the pull-back ring and the flaps, while the anchor simultaneously engages with the constraint groove through the spiral groove to form a second locking mechanism. During the pull-back process, the expansion seal inside the sealing component is compressed and ruptures, causing the internal materials to mix and expand, tightly filling the embedded cylinder and compressing the sealing ring into the anti-retraction ring groove, achieving multiple reliable sealing operations. This invention has an ingenious structure, is convenient to construct, requires no on-site pouring, and significantly improves the efficiency and sealing reliability of sealing exterior wall holes.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically a structure and construction method for sealing pre-reserved holes in sandwich-insulated exterior walls. Background Technology

[0002] Currently, in existing construction techniques for sandwich insulated exterior walls, there are often pre-reserved holes in the walls (e.g., large holes left by channel steel, cantilevered scaffolding, tower crane attachments, etc.). The sealing process typically involves first pouring inner leaf wall concrete, then, depending on the hole depth, pouring a portion of concrete with the same strength grade as the wall to restore the structural load; next, filling the hole with extruded polystyrene board (XPS board) or rock wool board with the same thermal conductivity as the design requirements. To ensure density, the gap between the insulation board and the hole wall must be filled with polyurethane foam; finally, sealing the outer leaf wall and applying crack-resistant treatment, pouring polymer mortar or fine aggregate concrete as a protective layer on the outside of the insulation layer. This process is complex and prone to interface delamination at the interface between the old and new insulation layers, leading to water accumulation. Therefore, this paper proposes a sealing structure and implementation method for pre-reserved holes in sandwich insulated exterior walls. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0004] A structure for sealing pre-reserved holes in a sandwich-insulated exterior wall includes:

[0005] The embedded cylinder is embedded in the hole, and multiple circumferentially distributed petals are installed on the inner wall of the embedded cylinder.

[0006] The sealing component has a pull-back ring installed at one end and a pull-back plate rotatably installed at the other end. The pull-back ring and the flap are fitted together. A central hole is provided on the side of the pull-back plate facing away from the pull-back ring. Multiple anchors are distributed circumferentially on the side of the pull-back plate facing the pull-back ring.

[0007] The connecting plate is installed at the end of the pre-embedded cylinder and has a through hole in the middle for the pull-back rod to pass through freely. A blind hole is provided in the middle of the side of the connecting plate facing the pull-back plate. A spiral groove and a constraint groove are provided at the tail of the spiral groove on the side of the blind hole. The constraint groove is a semi-circular groove distributed along the inner wall of the blind hole. The anchor is compatible with the constraint groove and the spiral groove.

[0008] The pull rod has one end passing through the through hole and detachably connected to the center hole, and the other end is equipped with an operating part.

[0009] In the aforementioned structure for sealing pre-reserved holes in the insulated exterior wall, the free end of the petal gradually moves away from the sealing component, and the free end of the pull-back ring gradually deviates from the sealing component in the direction close to the pull-back disc.

[0010] In the aforementioned structure for sealing pre-reserved holes in the thermal insulation exterior wall, a sealing ring is installed on the side of the connecting plate facing the petal. The end of the sealing ring away from the connecting plate gradually approaches the embedded cylinder, and an anti-retraction groove corresponding to the position of the sealing ring is provided in the embedded cylinder to prevent the sealing ring from approaching the petal.

[0011] In the aforementioned structure for sealing pre-reserved holes in the insulated exterior wall, the cross-section of the through hole is a polygonal structure;

[0012] The pull rod is provided with a polygonal body that slides into the through hole and a threaded head for connecting the center hole. The cross-sectional area of ​​the threaded head is less than or equal to the area of ​​the inscribed circle of the polygonal body.

[0013] In the aforementioned structure for sealing pre-reserved holes in the insulated exterior wall, one end of the embedded cylinder is provided with an outer expansion ring, which is used for connecting the plate installation.

[0014] In the aforementioned structure for sealing pre-reserved holes in the thermal insulation exterior wall, the sealing component includes a telescopic thermal insulation column and an expansion sealing body distributed on the outside of the telescopic thermal insulation column. The expansion sealing body includes an elastic body and a partition strip distributed on the inside of the elastic body. The partition strip divides the interior of the elastic body into storage compartment one and storage compartment two.

[0015] In the aforementioned structure for sealing pre-reserved holes in the insulated exterior wall, the surface of the separator strip has multiple tear structures distributed along its length.

[0016] A construction method for sealing pre-reserved holes in a sandwich-insulated exterior wall, the construction steps are as follows:

[0017] Step 1: Pre-embedding of the embedded cylinder

[0018] While the exterior wall is being poured or masonry, the pre-embedded cylinder is accurately embedded in the pre-set hole position, and the outer expansion ring is located on the outside of the wall to reserve a standardized interface for subsequent sealing operations. A water-stop ring located in the outer leaf wall and inner leaf wall can also be added to the outside of the pre-embedded cylinder. The water-stop ring can be welded and fixed separately to the outer wall of the pre-embedded cylinder.

[0019] Step 2: Sealing Operation

[0020] First, the threaded head and polygonal body at one end of the pull-back rod are passed through the through hole of the connecting plate. The polygonal body and the through hole are in a sliding fit. The threaded head and the center hole of the pull-back plate are threaded together to temporarily connect the pull-back rod to the sealing component.

[0021] Then, the connecting plate and the sealing component are pushed into the pre-embedded cylinder as a whole. The connecting plate is located in the outer expansion ring of the pre-embedded cylinder. The polygonal body and the polygonal through hole of the connecting plate maintain a sliding fit to ensure the stability of the insertion direction.

[0022] Adjust the length of the pull-back rod. When the sealing element is inserted to the preset depth (i.e., the pull-back ring completely passes through all the flaps), pull the pull-back rod outward through the operating part. The pull-back ring and the flaps engage with each other to form the first mechanical lock.

[0023] As the pull-back force continues, the telescopic insulation column is stretched, and its length increases;

[0024] While pulling back, keep the connecting plate and the outer expansion ring in close contact;

[0025] As the anchor on the pullback plate enters the spiral groove on the blind hole side of the connecting plate, the polygonal body and the through hole separate. Finally, the anchor is locked into the constraint groove at the tail, completing the rotational locking connection between the connecting plate and the pullback plate, forming the second mechanical lock.

[0026] Step 3: Expansion and Final Sealing

[0027] During the pull-back process, due to the axial stretching of the telescopic insulation column and the pull-back force, the elastic body inside the expansion seal is squeezed and deformed, causing the inner partition strip to break at the preset tear structure.

[0028] After the separator breaks, the pre-filled materials (such as water and bentonite) in storage chamber one and storage chamber two come into contact with each other, causing the internal volume of the elastic body to increase rapidly and expand. The expanded elastic body tightly fills the internal space of the entire pre-embedded cylinder, achieving efficient heat preservation and sealing.

[0029] At the same time, during the expansion process, the elastic body will squeeze the sealing ring in all directions, forcing the outer expansion end of the sealing ring to expand outward and tightly abut against the inner wall of the pre-embedded cylinder; since the inner wall of the pre-embedded cylinder is provided with an anti-retraction ring groove, the outer expansion end of the sealing ring will be embedded in the ring groove, forming a ratchet effect to prevent retraction, which further enhances the reliability of the sealing.

[0030] Finally, after confirming that all structures are locked and the expansion seal is in place, rotate in the opposite direction and pull out the pull-back rod to separate the threaded column head from the center hole of the pull-back disc, thus completing the sealing of the entire hole.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This invention addresses the issue of pre-embedded cylinders within sandwich-insulated exterior walls during construction, creating pre-drilled holes. When sealing these holes, a cylindrical structure with added lobes, working in conjunction with a pull-back ring on the sealing element, enables the sealing element to be pulled back. During the pull-back process, the anchor on the pull-back plate forms a unidirectional connection with the connecting plate, creating an initial tensile force between the pull-back ring and the connecting plate. Simultaneously, the tearing structure within the expansion seal on the sealing element tears, allowing the materials (water and bentonite) stored in storage chambers one and two to come into contact and react, causing the elastic body to expand and seal within the pre-embedded cylinder. This also tightly adheres the outer ring of the sealing ring to the inner wall of the pre-embedded cylinder, further reinforced by an anti-retraction ring groove. An initial mutual tensile force remains between the connecting plate and the pull-back ring, ultimately forming a multi-layered seal. This solves the problem of water seepage caused by interface gaps in existing post-sealing techniques. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the pre-reserved hole sealing structure for sandwich-insulated exterior walls according to the present invention.

[0034] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0035] Figure 3 for Figure 1 A magnified view of a section at point B in the middle.

[0036] Figure 4 This is a schematic diagram of the connecting disk.

[0037] Figure 5 This is a schematic diagram of the pull-back ring.

[0038] Figure 6 This is a schematic diagram of the distribution structure of the lobes.

[0039] In the diagram: 10. Embedded cylinder; 11. Flap; 101. Outer expansion ring; 102. Anti-retraction ring groove; 12. Outer sealing ring;

[0040] 20. Sealing component; 201. Telescopic insulation column; 202. Expansion seal; 2021. Elastic body; 2022. Separator strip; 21. Pull-back ring; 22. Pull-back disc; 23. Anchor;

[0041] 30. Connecting disc; 31. Sealing ring; 301. Blind hole; 302. Spiral groove; 303. Constraint groove;

[0042] 40. Pull-back rod; 401. Polygonal body; 402. Threaded column head; 41. Operating part. Detailed Implementation

[0043] 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.

[0044] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0045] Example 1

[0046] like Figures 1 to 6 As shown in the figure, this embodiment provides a structure for sealing pre-reserved holes in a sandwich-insulated exterior wall. The structure mainly includes: an embedded cylinder 10, a sealing component 20, a connecting plate 30, and a pull-back rod 40.

[0047] Specifically, the embedded cylinder 10 is pre-embedded in a reserved hole in the exterior wall. One end of the embedded cylinder 10 (i.e., the outer end of the exterior wall) is provided with an outer expansion ring 101 for positioning and installation of the subsequent connecting plate 30. Multiple circumferentially evenly distributed petals 11 are installed on the inner wall of the embedded cylinder 10. The petals 11 can be set at one end of the cylindrical structure inserted into the embedded cylinder 10, and the other end is equipped with a retaining ring located on the indoor side. The cylindrical structure can be installed individually during sealing. The free end of each petal 11 faces the inside of the embedded cylinder 10 and gradually moves away from the sealing member 20, forming a barbed structure. An outer sealing ring 12 is installed on the side of the petal 11 facing away from the outer expansion ring 101.

[0048] The main body of the sealing component 20 includes a telescopic heat insulation column 201 (elastic telescopic component) and an expansion sealing body 202 wrapped around the outside of the telescopic heat insulation column 201. Rigid ring plates are respectively provided at both ends of the expansion sealing body 202. The two sets of rigid ring plates are fixed to the fixed end and movable end of the telescopic heat insulation column 201, respectively, facilitating its elongation while effectively reducing axial expansion and increasing radial expansion. A pull-back ring 21 is installed at one end (i.e., the inner end) of the sealing component 20. The free end of the pull-back ring 21 gradually deviates outward from the telescopic heat insulation column 201 along the direction close to the pull-back plate 22, forming a barb structure adapted to the flap 11. Under the action of the telescopic heat insulation column 201, it can press the outer sealing ring 12 tightly to seal the outside of the flap 11. The other end (i.e. the outer end) of the sealing component 20 is rotatably mounted with a pull-back plate 22. The pull-back plate 22 has a central hole in the center of the side facing away from the pull-back ring 21. Multiple anchors 23 are circumferentially distributed on the side of the pull-back plate 22 facing the pull-back ring 21.

[0049] The expansion seal 202 further includes an elastic body 2021 and partition strips 2022 distributed inside the elastic body 2021. The partition strips 2022 divide the interior of the elastic body 2021 into two independent storage chambers, one and the other, which are pre-filled with reactive foaming materials (e.g., water and bentonite). Furthermore, the surface of the partition strips 2022 has multiple easily breakable tear structures along its length. When the elastic body 2021 is stretched and elongated, the partition strips 2022 will break at the tear structures, causing the expansion seal 202 to expand and seal within the embedded cylinder 10.

[0050] The connecting disc 30 is installed inside the outer expansion ring 101 (outer side of the outer wall) at the end of the pre-embedded cylinder 10. A through hole for the pull-back rod 40 to pass through is provided in the middle of the connecting disc 30; the cross-section of this through hole is preferably polygonal. A blind hole 301 is provided in the middle of the side of the connecting disc 30 facing the pull-back disc 22. A spiral groove 302 and a constraint groove 303 located at the tail of the spiral groove 302 are respectively provided on the side of the blind hole 301. The constraint groove 303 is a semi-circular groove distributed circumferentially along the inner wall of the blind hole 301, used to form a snap-fit ​​engagement with the anchor 23. A sealing ring 31 is also installed on the side of the connecting disc 30 facing the flap 11. The free end of the sealing ring 31 gradually approaches the inner wall of the pre-embedded cylinder 10. Correspondingly, an anti-retraction groove 102 corresponding to the position of the sealing ring 31 is provided on the inner wall of the pre-embedded cylinder 10 to prevent the sealing ring 31 from retracting after expansion.

[0051] One end of the pull-back rod 40 is provided with a threaded head 402 and a polygonal body 401 with a polygonal cross-section, and the other end is provided with an operating part 41. The threaded head 402 is used to detachably thread and connect to the center hole of the pull-back plate 22. The direction of rotation when separating is along the direction in which the anchor 23 enters the constraint groove 303. The polygonal body 401 is used to slide and engage with the polygonal through hole of the connecting plate 30 to facilitate the anchor 23 entering the spiral groove 302. The cross-sectional area of ​​the threaded head 402 is less than or equal to the area of ​​the inscribed circle of the polygonal body 401 to ensure smooth insertion.

[0052] Example 2

[0053] like Figures 1 to 6 As shown, based on the above structure, this embodiment also discloses a construction method for sealing pre-reserved holes in a sandwich-insulated exterior wall, the specific steps of which are as follows:

[0054] Step 1: Pre-embedding of the embedded cylinder

[0055] While the exterior wall is being poured or constructed, the pre-embedded cylinder 10 is accurately embedded in the pre-set hole position, and the outer expansion ring 101 is located on the outside of the wall, so as to reserve a standardized interface for subsequent sealing operations.

[0056] Step 2: Sealing Operation

[0057] First, threaded head 402 and polygonal body 401 at one end of pull-back rod 40 are passed through the through hole of connecting plate 30. Polygonal body 401 and through hole are in sliding fit. Threaded head 402 and center hole of pull-back plate 22 are threaded together, so that pull-back rod 40 is temporarily connected to sealing part 20.

[0058] Then, the connecting plate 30 and the sealing component 20 are pushed into the pre-embedded cylinder 10 as a whole. The connecting plate 30 is located in the outer expansion ring 101 of the pre-embedded cylinder 10. The polygonal body 401 and the polygonal through hole of the connecting plate 30 maintain a sliding fit to ensure the stability of the insertion direction.

[0059] Adjust the length of the pull rod 40. When the sealing member 20 is inserted to the preset depth (i.e., the pull ring 21 completely passes through all the petals 11), pull the pull rod 40 outward through the operating part 41. The pull ring 21 and the petals 11 are interlocked and hooked to each other to form the first mechanical lock.

[0060] As the pull-back force continues, the telescopic insulation column 201 is stretched, and its length increases;

[0061] While pulling back, keep the connecting plate 30 and the outer expansion ring 101 in close contact;

[0062] As the anchor 23 on the pullback plate 22 enters the spiral groove 302 on the side of the blind hole 301 of the connecting plate 30, the polygonal body 401 and the through hole separate. Finally, the anchor 23 is locked into the constraint groove 303 at the tail, completing the rotational locking connection between the connecting plate 30 and the pullback plate 22, forming the second mechanical lock.

[0063] Step 3: Expansion and Final Sealing

[0064] During the pull-back process, due to the axial stretching of the telescopic heat insulation column 201 and the pull-back force, the elastic body 2021 inside the expansion seal 202 is squeezed and deformed, causing the inner partition strip 2022 to break at the preset tear structure.

[0065] After the separator 2022 breaks, the pre-filled materials (such as water and bentonite) in storage chamber 1 and storage chamber 2 come into contact with each other, causing the internal volume of the elastic body 2021 to increase rapidly and expand. The expanded elastic body 2021 tightly fills the internal space of the entire pre-embedded cylinder 10, achieving efficient heat preservation and sealing.

[0066] At the same time, during the expansion process, the elastic body 2021 will squeeze the sealing ring 31 in all directions, forcing the free end of the sealing ring 31 to expand outward and tightly abut against the inner wall of the pre-embedded cylinder 10; since the inner wall of the pre-embedded cylinder 10 is provided with an anti-retraction ring groove 102, the outward expansion end of the sealing ring 31 will be embedded in the ring groove, forming a ratchet effect to prevent retraction, which further enhances the reliability of the sealing.

[0067] Finally, after confirming that all structures are locked and the expansion seal is in place, rotate in the opposite direction and pull out the pull rod 40 to separate the threaded head 402 from the center hole of the pull plate 22, thus completing the sealing construction of the entire hole.

[0068] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A structure for sealing pre-reserved holes in a sandwich-insulated exterior wall, characterized in that, include: The embedded cylinder (10) is embedded in the hole, and multiple circumferentially distributed petals (11) are installed on the inner wall of the embedded cylinder (10). The sealing component (20) has a pull-back ring (21) installed at one end and a pull-back plate (22) rotatably installed at the other end. The pull-back ring (21) and the flap (11) are fitted together. The pull-back plate (22) has a central hole on the side facing away from the pull-back ring (21). Multiple anchors (23) are distributed circumferentially on the side of the pull-back plate (22) facing the pull-back ring (21). The connecting plate (30) is installed at the end of the pre-embedded cylinder (10) and has a through hole in the middle for the pull-back rod (40) to pass through freely. A blind hole (301) is provided in the middle of the side of the connecting plate (30) facing the pull-back plate (22). A spiral groove (302) and a constraint groove (303) are provided on the side of the blind hole (301). The constraint groove (303) is a semi-circular groove distributed along the inner wall of the blind hole (301). The anchor (23) is adapted to the constraint groove (303) and the spiral groove (302). The pull rod (40) has one end passing through the through hole and detachably connected to the center hole, and the other end is provided with an operating part (41).

2. The structure for sealing pre-reserved holes in a sandwich-insulated exterior wall according to claim 1, characterized in that, The free end of the flap (11) gradually moves away from the sealing element (20), and the free end of the pull-back ring (21) gradually deviates from the sealing element (20) in the direction close to the pull-back disc (22).

3. The structure for sealing pre-reserved holes in a sandwich-insulated exterior wall according to claim 2, characterized in that, A sealing ring (31) is installed on the side of the connecting plate (30) facing the petal (11). The end of the sealing ring (31) away from the connecting plate (30) gradually approaches the pre-embedded cylinder (10), and the pre-embedded cylinder (10) is provided with an anti-retraction groove (102) corresponding to the position of the sealing ring (31) to prevent the sealing ring (31) from approaching the petal (11).

4. The structure for sealing pre-reserved holes in a sandwich-insulated exterior wall according to claim 3, characterized in that, The cross-section of the through hole is a polygonal structure; The pull rod (40) is provided with a polygonal body (401) that slides in the through hole and a threaded head (402) for connecting the center hole. The cross-sectional area of ​​the threaded head (402) is less than or equal to the area of ​​the inscribed circle of the polygonal body (401).

5. The structure for sealing pre-reserved holes in a sandwich-insulated exterior wall according to claim 4, characterized in that, One end of the pre-embedded cylinder (10) is provided with an outer expansion ring (101), which is used for the installation of the connecting plate (30).

6. The structure for sealing pre-reserved holes in a sandwich-insulated exterior wall according to claim 5, characterized in that, The sealing component (20) includes a telescopic heat insulation column (201) and an expansion sealing body (202) distributed on the outside of the telescopic heat insulation column (201). The expansion sealing body (202) includes an elastic body (2021) and a partition strip (2022) distributed on the inside of the elastic body (2022). The partition strip (2022) divides the interior of the elastic body (2021) into storage compartment one and storage compartment two.

7. A structure for sealing pre-reserved holes in a sandwich-insulated exterior wall according to claim 6, characterized in that, The surface of the separator (2022) has multiple tear structures distributed along its length.

8. A construction method for sealing pre-reserved holes in a sandwich-insulated exterior wall according to claim 7, characterized in that, The construction steps are as follows: Step 1: Pre-embedding of the embedded cylinder While the concrete is being poured or the masonry is being constructed on the exterior wall, the embedded cylinder (10) is accurately embedded in the pre-set hole position, and the outer expansion ring (101) is located on the outside of the wall, so as to reserve a standardized interface for subsequent sealing operations. Step 2: Sealing Operation First, threaded head (402) and polygonal body (401) at one end of pull-back rod (40) are passed through the through hole of connecting plate (30). The polygonal body (401) and the through hole are in sliding fit. Threaded head (402) and center hole of pull-back plate (22) are threaded together, so that pull-back rod (40) is temporarily connected to sealing part (20). Then, the connecting plate (30) and the sealing part (20) are pushed into the pre-embedded cylinder (10) as a whole. The connecting plate (30) is located in the outer expansion ring (101) of the pre-embedded cylinder (10). The polygonal body (401) and the polygonal through hole of the connecting plate (30) maintain a sliding fit to ensure that the insertion direction is stable. Adjust the length of the pull rod (40) when the sealing part (20) is inserted to the preset depth, and pull the pull rod (40) outward through the operating part (41). The pull ring (21) and the flap (11) are hooked together to form the first mechanical lock. As the pull-back force continues, the telescopic insulation column (201) is stretched, and its length increases; While pulling back, keep the connecting plate (30) and the outer expansion ring (101) in close contact; As the anchor (23) on the pullback plate (22) enters the spiral groove (302) on the side of the blind hole (301) of the connecting plate (30), the polygonal body (401) and the through hole separate, and finally the anchor (23) is inserted into the constraint groove (303) at the tail, completing the rotational locking connection between the connecting plate (30) and the pullback plate (22) to form the second mechanical lock; Step 3: Expansion and Final Sealing During the pull-back process, due to the axial stretching of the telescopic insulation column (201) and the pull-back force, the elastic body (2021) inside the expansion seal (202) is squeezed and deformed, causing the inner partition strip (2022) to break at the preset tear structure. After the separator (2022) breaks, the pre-filled materials in storage chamber 1 and storage chamber 2 come into contact with each other, causing the internal volume of the elastic body (2021) to increase rapidly and expand. The expanded elastic body (2021) tightly fills the internal space of the entire embedded cylinder (10), achieving efficient heat preservation and sealing. At the same time, the elastic body (2021) will squeeze the sealing ring (31) in all directions during the expansion process, forcing the outer expansion end of the sealing ring (31) to expand outward and tightly abut against the inner wall of the pre-embedded cylinder (10); since the inner wall of the pre-embedded cylinder (10) is provided with an anti-retraction ring groove (102), the outer expansion end of the sealing ring (31) will be embedded in the ring groove, forming a ratchet effect to prevent retraction, which further enhances the reliability of the sealing. Finally, after confirming that all structures are locked and the expansion seal is in place, rotate in the opposite direction and pull out the pull rod (40) to separate the threaded head (402) from the center hole of the pull plate (22), thus completing the sealing construction of the entire hole.

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