Waterproof maintenance device for hole
By providing a device for waterproof maintenance of hole openings, using the patch assembly to bond with the hole wall and grouting through the grouting hole, the problem that the grouting liquid cannot effectively seal the edge of the leaky gap is solved, and a more efficient sealing effect is achieved .
Patent Information
- Application Number
- CN202421186529.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-27
AI Technical Summary
In the prior art, grouting liquid cannot effectively seal the edge of the water leakage gap at the hole wall of the hole, causing indoor water to enter the water leakage gap from the hole opening and leakage problems.
A hole waterproof maintenance device is provided, including a patch assembly and a support assembly. The patch assembly is used to fit the hole wall of the hole opening and to be provided with grouting holes thereon. The support assembly is used to press the patch assembly against the hole wall to form a closed grouting space and grout into the space through the grouting hole to seal the water leakage gap.
The patch assembly is pressed and bonded to the hole wall by supporting the supporting assembly, forming a closed grouting space, and the grouting liquid penetrates into the water leakage gap and covers the hole wall at the hole opening, achieving sealing of the water leakage gap and improving the sealing effect of the grouting liquid.
Smart Images

Figure CN222435968U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of building waterproof construction, and specifically relates to a hole waterproof maintenance device. Background Art
[0002] The building floor of the water room in the building includes a structural layer, a waterproof layer arranged on the structural layer and a protective layer arranged on the waterproof layer. It is necessary to open a hole later because no hole is reserved for penetrating the plate after the construction is completed or the increase of equipment after many years requires the opening of a hole. The later hole needs to pass through the protective layer, the waterproof layer and the structural layer, resulting in a leaking gap at the hole wall of the hole. The indoor water will enter the leaking gap from the hole wall of the hole and cause leakage.
[0003] In the prior art, the hole wall of the hole is sealed by grouting. In the above-mentioned related technologies, it is necessary to drill a grouting hole and inject grouting liquid into the building floor through the grouting hole, and then use the self-flow of the grouting liquid to seal the leaking gap. However, the grouting liquid cannot effectively seal the edge of the leaking gap at the hole wall of the hole, resulting in indoor water entering the leaking gap from the hole and causing leakage. Utility Model Content
[0004] The purpose of this application is to provide a waterproof maintenance device for a cave opening, aiming to enhance the sealing effect of the grouting liquid.
[0005] In order to achieve the above-mentioned purpose, the present application provides a hole waterproof repair device, comprising:
[0006] A patch assembly, used to fit with the hole wall of the hole, and a grouting hole is opened on the patch assembly; and
[0007] A supporting component is connected to the patch component and is used to press the patch component against the hole wall.
[0008] In some embodiments, the patch assembly includes a plurality of inner support plates, the outer circumferential wall contour of the inner support plates matches the contour of the hole wall, and the circumferential ends of two adjacent inner support plates are provided with end connection structures for mutual connection.
[0009] In some embodiments, the support assembly includes a plurality of support rods, the first ends of the plurality of support rods are respectively connected to the plurality of inner support plates, and the second ends of the plurality of support rods are provided with a fixed support structure.
[0010] In some embodiments, a spherical member is provided on the inner peripheral wall of the inner support plate, and a spherical wrapping member is provided on the first end of the support rod, and the spherical wrapping member is nested and connected with the spherical member.
[0011] In some embodiments, the fixed support structure includes a telescopic rod, and the second ends of the plurality of support rods are hinged to the telescopic end of the telescopic rod.
[0012] In some embodiments, the end connection structure is a detachable structure; and / or,
[0013] The end connection structure includes a plurality of plug-in protrusions, a plurality of plug-in grooves and a bolt rod. The plug-in protrusions can be plug-matched with the plug-in grooves and are provided with bolt holes along the axial direction. The bolt rod is inserted into the bolt holes.
[0014] In some embodiments, the patch assembly further includes an elastic plate, an inner peripheral wall of the elastic plate is connected to an outer peripheral wall of the inner support plate, and an outer peripheral wall of the elastic plate is in contact with the hole wall.
[0015] In some embodiments, one of the outer circumferential wall of the inner support plate and the inner circumferential wall of the elastic member is formed with a mounting groove, and the other of the outer circumferential wall of the inner support plate and the inner circumferential wall of the elastic plate is formed with a mounting protrusion, and the mounting protrusion is plugged into and fits with the mounting groove.
[0016] In some embodiments, a grouting nozzle extending in the radial direction is formed on the elastic plate, the grouting nozzle is plug-fitted with the grouting hole, and a non-return structure for preventing the grouting liquid from flowing back is provided in the grouting nozzle.
[0017] In some embodiments, the end connection structure further includes a guard plate disposed at the end of the inner support plate, wherein the guard plate extends along the circumference of the inner support plate and is used to seal a gap between two adjacent inner support plates.
[0018] Through the above technical solution, the hole waterproof repair device provided by the present application has the following beneficial effects:
[0019] A hole is opened on the building floor of a water room in a building, resulting in a leaky gap at the hole wall of the hole. In the present application, the patch component is pressed against the hole wall by a support component, so that the patch component and the hole wall form a closed grouting space, and grouting is injected into the grouting space through the grouting port on the patch component, so that the slurry penetrates into the leaky gap and covers the hole wall of the hole, thereby achieving the sealing of the leaky gap to improve the sealing effect of the grouting liquid.
[0020] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:
[0022] Figure 1 It is a structural schematic diagram of a building floor according to a specific embodiment of the present application;
[0023] Figure 2 It is a schematic diagram of the installation of the hole waterproof maintenance device according to a specific embodiment of the present application;
[0024] Figure 3 It is a structural schematic diagram of a hole waterproof maintenance device according to a specific embodiment of the present application;
[0025] Figure 4 It is a structural schematic diagram of an inner support plate according to a specific embodiment of the present application;
[0026] Figure 5 It is a schematic diagram of the structure of the support rod according to a specific embodiment of the present application;
[0027] Figure 6 It is a schematic diagram of the structure of the elastic plate according to a specific embodiment of the present application;
[0028] Figure 7 It is a structural schematic diagram of the elastic plate from another perspective according to a specific embodiment of the present application.
[0029] Description of Reference Numerals
[0030] 100 Hole waterproof repair device 200 Structural layer
[0031] 300 waterproof layer 400 protective layer
[0032] 1 Hole 2 Hole wall
[0033] 3 patch components 31 inner support plate
[0034] 32 elastic plate 33 mounting groove
[0035] 34 Mounting protrusion 35 Grouting nozzle
[0036] 36 Sealing strip 37 Grouting hole
[0037] 4 Support assembly 41 Support rod
[0038] 42 Telescopic rod 43 Spherical part
[0039] 44 Spherical wrapping piece 45 Top support
[0040] 5 Insertion protrusion 6 Insertion groove
[0041] 7 Bolt 8 Guard DETAILED DESCRIPTION
[0042] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.
[0043] The following describes the noun part of the hole waterproof repair device 100 according to the present application with reference to the drawings.
[0044] like Figures 1 to 7 As shown, a specific embodiment of the present application provides a hole waterproof repair device 100, including a patch component 3 and a support component 4, wherein the patch component 3 is used to fit with the hole wall 2 of the hole 1, and a grouting hole 37 is opened on the patch component 3; the support component 4 is connected to the patch component 3 and is used to press the patch component 3 against the hole wall 2.
[0045] The building floor of the water room of the building includes a structural layer 200, a waterproof layer 300 arranged on the structural layer 200, and a protective layer 400 arranged on the waterproof layer 300. In the actual construction process, it is necessary to open a hole 1 on the completed building floor to install equipment and pipelines, but the opening of the hole 1 will destroy the structural layer 200, the waterproof layer 300 and the protective layer 400 and form a water leakage gap, and the water leakage gap will extend to the hole wall 2. In the present application, the patch component 3 is pressed against the hole wall 2 by the support component 4 so that the patch component 3 and the hole wall 2 form a grouting space, and pressure grouting is performed into the grouting space through the grouting hole 37 on the patch component 3. The grouting liquid penetrates into the water leakage gap due to pressure to block it, and the remaining grouting liquid after the water leakage gap is filled with the grouting liquid completes the sealing of the hole wall 2, thereby improving the sealing effect of the grouting liquid.
[0046] Furthermore, the grouting liquid forms a hard shell layer at the hole wall 2 of the hole opening 1 , which can not only seal the water leakage gap, but also play a role in reinforcing the hole opening 1 .
[0047] It should be noted that in the present application, the cross-sectional shape of the hole 1 can be circular, rectangular, polygonal, etc. In the following specific embodiments, the cross-sectional shape of the hole 1 is preferably circular. Unless otherwise specified, the directional terms "axial", "circumferential" and "radial" used are all based on the circular hole 1.
[0048] In some embodiments, the patch assembly 3 includes a plurality of inner support plates 31, the outer circumferential wall contour of the inner support plates 31 matches the contour of the hole wall 2, and the ends of two adjacent inner support plates 31 along the circumferential direction are provided with end connection structures for interconnection.
[0049] Specifically, the inner support plate 31 is a small arc-shaped piece, and multiple inner support plates 31 are interconnected to form a large arc-shaped plate. The center of the large arc-shaped piece coincides with the center of the hole 1, and the outer peripheral wall of the large arc-shaped plate fits the hole wall 2 as closely as possible, thereby ensuring that the inner support plate 31 and the hole wall 2 form a closed grouting space, thereby improving the sealing effect of the grouting liquid.
[0050] Furthermore, the support assembly 4 is connected to the inner peripheral wall of the inner support plate 31 and provides a radially outward force, thereby strengthening the fit between the inner support plate 31 and the hole wall 2.
[0051] It should be noted that the directional terms "outer" and "inner" used in this application refer to the side radially away from the center of the circle and the side radially closer to the center of the circle, respectively. For example, the outer circumferential wall of the inner support plate 31 refers to the side radially away from the center of the circle and close to the hole wall 2, and the inner circumferential wall of the inner support plate 31 refers to the side radially close to the center of the circle and away from the hole wall 2.
[0052] Those skilled in the art can understand that the shape of the inner support plate 31 matches the cross-sectional shape of the hole wall 2 of the hole opening 1, and inner support plates 31 of other shapes should also fall within the protection scope of the present application.
[0053] Preferably, the patch assembly 3 further includes an elastic plate 32, the inner peripheral wall of the elastic plate 32 is connected to the outer peripheral wall of the inner support plate 31, and the outer peripheral wall of the elastic plate 32 is in contact with the hole wall 2. In view of the unevenness of the hole wall 2, the elastic plate 32 having elasticity is used to contact the hole wall 2, thereby strengthening the contact between the hole waterproof repair device 100 and the hole wall 2, thereby ensuring the sealing effect of the grouting liquid.
[0054] Since the hole diameters of the hole openings 1 are different and the inner support plate 31 is made of rigid material, the hole opening waterproof repair device 100 cannot be used for grouting operations of holes 1 with different hole diameters. Therefore, an elastic plate 32 is provided on the outer peripheral wall of the inner support plate 31 to fit the hole wall 2 with different hole diameters, thereby strengthening the fit between the hole opening waterproof repair device 100 and the hole wall 2, thereby ensuring the sealing effect of the grouting liquid.
[0055] Specifically, the elastic plate 32 is an arc-shaped component, the inner circumferential wall of the elastic plate 32 is in contact with the outer circumferential wall of the correspondingly installed inner support plate 31 , and the axial side of the elastic plate 32 is flush with the axial side of the inner support plate 31 .
[0056] Furthermore, sealing strips 36 are provided at the circumferential ends and axial sides of the outer wall of the elastic plate 32. The sealing strips 36 protrude radially outward from the outer wall of the elastic plate 32 and surround the entire elastic plate 32, thereby preventing the grouting liquid from leaking from the gap between the circumferential ends of the elastic plate 32 and the hole wall 2 and the gap between the axial sides of the elastic plate 32 and the hole wall 2, thereby ensuring the sealing effect of the grouting liquid.
[0057] In some embodiments, a peripheral wall connection structure is provided between the outer peripheral wall of the inner support plate 31 and the inner peripheral wall of the elastic plate 32 , so that the inner support plate 31 is tightly connected to the elastic plate 32 .
[0058] Specifically, one of the outer circumferential wall of the inner support plate 31 and the inner circumferential wall of the elastic plate 32 is formed with a mounting groove 33, and the other of the outer circumferential wall of the inner support plate 31 and the inner circumferential wall of the elastic member is formed with a mounting protrusion 34, and the mounting protrusion 34 is plugged into and matched with the mounting groove 33, and the two can be separated when the elastic plate 32 needs to be replaced.
[0059] Preferably, the mounting protrusion 34 is integrally formed with the elastic plate 32, and the mounting groove 33 is integrally formed with the inner support plate 31. The cross-sectional shapes of the mounting protrusion 34 and the mounting groove 33 are both trapezoidal, thereby preventing the elastic plate 32 from being separated from the inner support plate 31 in the radial direction. When separating the elastic plate 32 from the inner support plate 31, axial separation is required.
[0060] Those skilled in the art can understand that the present application is not limited to the above-mentioned trapezoidal cross-section of the mounting protrusion 34 and the mounting groove 33, and can also be other structural forms such as a circle that can avoid the mounting protrusion 34 and the mounting groove 33 from being separated radially, and other structural forms should also fall within the scope of protection of the present application. The present application is also not limited to the above-mentioned peripheral wall connection structure of the mounting protrusion 34 and the mounting groove 33, and can also be other connection methods such as direct adhesion, and other connection methods should also fall within the scope of protection of the present application.
[0061] Preferably, a grouting nozzle 35 extending in the radial direction is formed on the elastic plate 32 , the grouting nozzle 35 is plugged into and matched with the grouting hole 37 , and a non-return structure for preventing the grouting liquid from flowing back is provided in the grouting nozzle 35 .
[0062] Specifically, the grouting nozzle 35 extends radially inward and is inserted into the grouting hole 37 . A grouting channel is formed in the grouting nozzle 35 , and a non-return structure is disposed in the grouting nozzle 35 .
[0063] Preferably, the anti-return structure includes a spring and a top ball. When grouting is not performed, the top ball is located in the grouting channel under the action of the spring to close the grouting channel; when grouting is performed, the grouting liquid exerts a force on the top ball that is greater than the force of the spring on the top ball, thereby pushing the top ball away from the grouting channel to open the grouting channel.
[0064] In some embodiments, the end connection structure is a detachable structure, so as to achieve the installation and disassembly of multiple inner support plates 31.
[0065] Preferably, the end connection structure includes a plurality of plug-in protrusions 5, a plurality of plug-in grooves 6 and a bolt rod 7. The plug-in protrusions 5 can be plugged and matched with the plug-in grooves 6 and are provided with bolt holes along the axial direction, and the bolt rod 7 is inserted into the bolt holes. When two adjacent inner support plates 31 are spliced, the plug-in protrusions 5 of one inner support plate 31 are plugged and matched with the plug-in grooves 6 of the other inner support plate 31, and the bolt holes on the plug-in protrusions 5 of the two inner support plates 31 are ensured to be connected along the axial direction, and then the bolt rod 7 is inserted into the bolt hole.
[0066] Furthermore, the end connection structure also includes a guard plate 8 arranged at the end of the inner support plate 31, which extends along the circumference of the inner support plate 31 and is used to seal the gap between two adjacent inner support plates 31, thereby strengthening the connection between the two adjacent inner support plates 31, and preventing the grouting liquid from flowing out of the gap between the two adjacent inner support plates 31, thereby ensuring the sealing effect of the grouting liquid.
[0067] Those skilled in the art will appreciate that the present application is not limited to the above-mentioned end connection structure of the multiple plug-in protrusions 5, the multiple plug-in grooves 6 and the bolt rod 7, but may also include other structural forms such as bolts passing through the end of the inner support plate 31 and fasteners on the inner circumferential wall of the inner support plate 31, and other structural forms should also fall within the scope of protection of the present application.
[0068] In a specific embodiment of the present application, the support assembly 4 includes a plurality of support rods 41, the first ends of the plurality of support rods 41 are respectively connected to a plurality of inner support plates 31, and the second ends of the plurality of support rods 41 are provided with a fixed support structure, and the fixed support structure is used to act on the support rods 41, so that the support rods 41 provide radial outward pressure and act on the inner support plate 31, thereby making the elastic plate 32 pressed against the hole wall 2 to ensure the sealing effect of the grouting liquid.
[0069] Preferably, the fixed support structure includes a telescopic rod 42, and the second ends of the plurality of support rods 41 are hinged to the telescopic end of the telescopic rod 42. Since the plurality of inner support plates 31 do not need to cover the entire hole wall 2 after being connected, the fixed end of the telescopic rod 42 is pressed against the hole wall 2, and the hole wall 2 is acted on by the telescopic rod 42 to obtain the reaction force provided by the hole wall 2, so that the reaction force is transmitted to the support rod 41 to act on the inner support plate 31. In addition, the telescopic rod 42 is adapted to holes 1 of different apertures by telescoping, and the telescopic rod 42 can be locked after being adjusted to a suitable length, thereby providing a stable force to the hole wall 2, thereby ensuring the stability of the hole waterproof repair device 100.
[0070] Specifically, the connection method between the inner support rod and the telescopic rod 42 can adopt a connection structure well known to technical personnel in this field, such as a bolt connection, a pre-supported spherical connection, etc. Since the connection structure does not belong to the core improvement part of the present application, it will not be repeated here.
[0071] Furthermore, a top support 45 is provided at the fixed end of the telescopic rod 42 to increase the contact area between the telescopic rod 42 and the hole wall 2, thereby further ensuring that the telescopic rod 42 provides a stable force to the hole wall 2. Even more, the telescopic rod 42 can be eliminated and the top support 45 can be directly provided at the ends of the multiple inner support rods to serve as a fixed support structure, thereby simplifying the device.
[0072] Preferably, a spherical part 43 is provided on the inner circumferential wall of the inner support plate 31, and a spherical wrapping part 44 is provided on one end of the support rod 41 connected to the inner support plate 31. The spherical wrapping part 44 is nested and connected with the spherical part 43, thereby realizing a rotatable connection between the inner support plate 31 and the support rod 41, and then realizing rotation of the support rod 41 to obtain an optimal fixed position when the inner support plate 31 is fixed.
[0073] The specific embodiment of the present application also provides a pipeline installation method, which is implemented by using a hole waterproofing repair device 100. Since the pipeline installation method adopts all embodiments of the hole waterproofing repair device 100, the pipeline installation method has all the beneficial effects brought by the hole waterproofing repair device 100.
[0074] Specifically, the pipeline installation method includes: drilling a hole 1 on a building floor; using a hole waterproofing maintenance device 100 to perform pressure grouting on a hole wall 2 of the hole 1; after the grouting is completed, removing the hole waterproofing maintenance device 100 and inserting a pipeline into the hole 1; filling a gap between the pipeline and the hole wall 2 with a foam rod; using a mold to surround the pipeline, and pouring polyurea grouting liquid between the mold and the outer wall of the pipeline; and removing the mold after the polyurea grouting liquid solidifies.
[0075] Furthermore, the polyurea grouting material poured after surrounding the pipe with a mold is used to fill the gaps that cannot be sealed by the foam rod, and the mold used is higher than the end face of the pipe in the axial direction, so that the solidified polyurea grouting material can seal the end of the gap between the pipe and the hole wall 2, thereby preventing water from seeping from the gap between the pipe and the hole wall 2.
[0076] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0077] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0079] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A waterproof maintenance device for a hole, characterized in that: include: A patch component (3) is used to fit with the hole wall (2) of the hole opening (1), and a grouting hole (37) is provided on the patch component (3); and A support component (4) is connected to the patch component (3) and is used to press the patch component (3) against the hole wall (2).
2. The hole waterproof repair device according to claim 1, characterized in that: The patch assembly (3) comprises a plurality of inner support plates (31), the outer peripheral wall contour of the inner support plates (31) matches the contour of the hole wall (2), and the ends of two adjacent inner support plates (31) along the circumferential direction are provided with end connection structures for mutual connection.
3. The hole waterproof repair device according to claim 2, characterized in that: The support assembly (4) comprises a plurality of support rods (41), the first ends of the plurality of support rods (41) are respectively connected to the plurality of inner support plates (31), and the second ends of the plurality of support rods (41) are provided with a fixed support structure.
4. The hole waterproof repair device according to claim 3, characterized in that: The inner peripheral wall of the inner support plate (31) is provided with a spherical piece (43), and the first end of the support rod (41) is provided with a spherical wrapping piece (44), and the spherical wrapping piece (44) is nested and connected with the spherical piece (43).
5. The hole waterproof repair device according to claim 3, characterized in that: The fixed support structure comprises a telescopic rod (42), and the second ends of the plurality of support rods (41) are hinged to the telescopic ends of the telescopic rod (42).
6. The hole waterproof repair device according to claim 2, characterized in that: The end connection structure is a detachable structure; and / or, The end connection structure comprises a plurality of plug-in protrusions (5), a plurality of plug-in grooves (6) and a bolt rod (7); the plug-in protrusions (5) can be plugged into and matched with the plug-in grooves (6) and are provided with bolt holes along the axial direction; the bolt rod (7) is inserted into the bolt holes.
7. The hole waterproof repair device according to claim 2, characterized in that: The patch assembly (3) further comprises an elastic plate (32), the inner peripheral wall of the elastic plate (32) being connected to the outer peripheral wall of the inner support plate (31), and the outer peripheral wall of the elastic plate (32) being in contact with the hole wall (2).
8. The hole waterproof repair device according to claim 7, characterized in that: One of the outer peripheral wall of the inner support plate (31) and the inner peripheral wall of the elastic plate (32) is formed with a mounting groove (33), and the other of the outer peripheral wall of the inner support plate (31) and the inner peripheral wall of the elastic plate (32) is formed with a mounting protrusion (34), and the mounting protrusion (34) is plug-fitted with the mounting groove (33).
9. The hole waterproof repair device according to claim 7, characterized in that: The elastic plate (32) is provided with a grouting nozzle (35) extending in the radial direction. The grouting nozzle (35) is plugged into and matched with the grouting hole (37). A non-return structure for preventing the grouting liquid from flowing back is provided inside the grouting nozzle (35).
10. The hole waterproof repair device according to claim 2, characterized in that: The end connection structure also includes a guard plate (8) arranged at the end of the inner support plate (31), wherein the guard plate (8) extends along the circumference of the inner support plate (31) and is used to seal the gap between two adjacent inner support plates (31).