Reinforcing assembly and reinforcing method for rear holing of concrete beam compression area

Abstract

The invention discloses a reinforcing assembly and a reinforcing method for a rear hole in a concrete beam compression area, the reinforcing assembly comprises a hollow tubular double-layer main body, the double-layer main body comprises an outer wall body and an inner wall body, an interlayer is formed between the outer wall body and the inner wall body, the outer wall body and the inner wall body are both correspondingly provided with a plurality of strip-shaped notches, and the strip-shaped notches are communicated with the interlayer. Therefore, the device is divided into a plurality of blocks. A plurality of elastic expanders are arranged at the positions, located at the strip-shaped notches, in the interlayer, when the elastic expanders are in a compressed state, the double-layer body is in a contracted state that the strip-shaped notches are closed, and when the elastic expanders are in an unfolded state, the double-layer body is in an expanded state that the strip-shaped notches are opened. The method has the advantages of being good in reinforcing effect, convenient to construct, wide in applicability and low in price.

Description

Technical Field

[0001] This invention relates to a concrete beam reinforcement component, and more particularly to a reinforcement component and method for post-opening holes in the compression zone of a concrete beam. Background Technology

[0002] In renovation projects, to meet the requirements of equipment pipeline routing and maintain the original floor height, it is common to create openings for equipment pipelines in the compression zone after they encounter beams. This is not only prevalent in the renovation of existing buildings but also frequently encountered in the interior decoration of new construction projects. Many of these openings are located at the main beam supports or in the mid-span compression zone. Without reinforcement, this poses a certain structural safety risk, leading to the following problems:

[0003] 1) Decreased flexural bearing capacity of beam members: Openings in the compression zone will directly weaken the concrete section of the compression zone, causing local stress concentration in the concrete, and the concrete is at risk of crushing, which greatly reduces the flexural bearing capacity of the beam.

[0004] 2) Reduced shear capacity: Openings directly weaken the shear section of concrete, and the opening location may also break the stirrups, further reducing the shear capacity.

[0005] 3) Decreased seismic performance: Openings weaken the ductility and energy dissipation capacity of beam sections. Under earthquake action, the openings are prone to become weak points, resulting in cracks or premature failure.

[0006] Currently, reinforcement methods for beam openings include: carbon fiber reinforcement, steel plate reinforcement, and cross-section enlargement. However, all of these methods require design consultation with a design institute, which extends the construction and delivery period to some extent. Furthermore, the reinforcement costs are high, the construction is complex, and requires a certain level of expertise, necessitating the work of qualified professional reinforcement contractors. Another method is steel sleeve pressure grouting, but with this method, the steel sleeve and concrete cannot adhere tightly to each other for joint stress distribution, often resulting in grout leakage and making it difficult to control construction quality. Summary of the Invention

[0007] The purpose of this invention is to provide a reinforcement component and method for post-extension openings in the compression zone of concrete beams. This invention features excellent reinforcement effect, convenient construction, wide applicability, and low cost.

[0008] The technical solution of the present invention: A reinforcing component for post-opening of a compression zone in a concrete beam, comprising a hollow tubular double-layer body, the double-layer body comprising an outer wall and an inner wall, with a sandwich layer formed between the outer wall and the inner wall, and each of the outer wall and the inner wall having a number of corresponding strip-shaped notches, thus dividing it into several blocks; within the sandwich layer, a number of elastic expanders are provided at the strip-shaped notches, when the elastic expanders are in a compressed state, the double-layer body is in a tight state that closes the strip-shaped notches, and when the elastic expanders are in an expanded state, the double-layer body is in an expanded state that opens the strip-shaped notches.

[0009] In the aforementioned reinforcement component for opening a hole in the compression zone of a concrete beam, the elastic expander includes two spring bases located on both sides of the strip-shaped notch. The two ends of the spring bases are fixedly connected to the outer wall and the inner wall, respectively. High-strength springs are provided on both spring bases, and a support rod is provided between the two high-strength springs. The support rod corresponds to the strip-shaped notch.

[0010] In the aforementioned reinforcement component for creating a hole in the compression zone of a concrete beam, the inner wall is detachably connected to a fastening ring that maintains the elastic expander in a compressed state.

[0011] In the aforementioned reinforcing component for creating openings in the compression zone of a concrete beam, several mounting plates are arranged in a ring on the inner side of the inner wall, and the fastening ring is fastened to all the mounting plates.

[0012] In the aforementioned reinforcing component for creating a hole in the compression zone of a concrete beam, a transparent film is provided on the outer wall at the strip-shaped notch, and the two sides of the transparent film are respectively connected to the outer wall on both sides of the strip-shaped notch; when the double-layer body is in a compressed state, the transparent film is in a folded state; when the double-layer body is in an unfolded state, the transparent film is in an unfolded state.

[0013] In the aforementioned reinforcement component for creating openings in the compression zone of a concrete beam, a snap plate is provided on the inner wall at the strip-shaped notch; the snap plate includes a plate body, on which several buckles are provided for connection with the support rod.

[0014] In the aforementioned reinforcement component for opening holes in the compression zone of a concrete beam, both ends of the double-layer main body are provided with cover plates; the cover plates include ring covers with ring buckles, and the interlayer openings at both ends of the double-layer main body form slots for inserting and installing the ring buckles; the outer annular surface of the ring buckle is provided with a first one-way buckle tooth, and the inner wall of the slot is provided with a second one-way buckle tooth that corresponds to and connects with the first one-way buckle tooth.

[0015] In the aforementioned reinforcement component for opening a hole in the compression zone of a concrete beam, the interlayer is further provided with several connecting ribs distributed radially and axially along the double-layer main body, one side of the connecting rib is connected to the outer wall, and the other side of the connecting rib is connected to the inner wall.

[0016] The above-mentioned reinforcement method for reinforcing components used to create openings in the compression zone of concrete beams includes the following steps:

[0017] S1. Make an opening at the location of the opening behind the beam, and the diameter of the opening corresponds to the size of the double-layer main body in the expanded state;

[0018] S2. Roughen the concrete surface of the opening wall and apply structural adhesive evenly to the opening wall.

[0019] S3. Apply structural adhesive to the outer wall of the double-layer main body, insert it into the opening, fix the position, remove the fastening ring, so that the elastic expander expands, the outer wall adheres tightly to the opening wall, and the transparent film unfolds at the same time.

[0020] S4. Fasten metal fasteners into the inner wall body to form a complete cylindrical wall on the inner wall surface.

[0021] S5. Apply adhesive to the back of the ring cover of the cover plate and the wall of the opening, and then insert the cover plate into both ends of the double-layer body.

[0022] In the aforementioned reinforcement method, between steps S3 and S4, the following step is also included:

[0023] S41. Observe through the transparent film whether there is any glue leakage between the hole wall and the double-layer body;

[0024] S42. If so, inject glue to fill the leaked area.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The reinforcing component of this invention reinforces the opening in a concrete beam, achieving the following specific effects:

[0027] 1. The double-layer main body is expanded by an elastic expander. The expanded double-layer main body exerts pressure on the opening position. With the help of structural adhesive, it can fit the opening wall well. After the buckle plate is embedded in the strip notch, the inner wall of the double-layer main body forms a complete cylinder wall, forming a solid whole with the original structural beam.

[0028] 2. It can effectively improve the bending resistance, shear resistance and seismic resistance of beams damaged by openings, and avoid beam section failure at the opening location due to section weakening and stress concentration after opening.

[0029] 3. The operation steps are few, the construction is simple, the operation is safe, and there is no construction qualification threshold.

[0030] 4. It can design reinforcement components with different pipe diameters, wall thicknesses, and numbers of elastic expanders for different opening diameters to meet the opening requirements of various components in the compression zone; according to the stress requirements of the compression components such as beams or shear walls, the spring force of the high-strength spring in the elastic expander can be divided into multiple levels to adapt to the stress reinforcement requirements of compression components with different strength levels, spans, and heights.

[0031] 5. The production and construction costs of the product are comparable to or even lower than other reinforcement measures.

[0032] 6. In addition to being used for opening holes in the compression zone of beams, it is also suitable for reinforcing other compression components such as shear walls by opening holes and inserting pipes, making it widely applicable.

[0033] Therefore, this invention is highly practical and has excellent reinforcing effect; it is convenient to use and construct, and has no qualification requirements; it has wide applicability and can meet the requirements of compression components with different opening diameters and different stress conditions; and it is relatively inexpensive and can be mass-produced. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention.

[0035] Figure 2 This is a perspective view of the double-layered main body of the present invention in a compressed state.

[0036] Figure 3 This is a perspective view of the double-layer main body of the present invention in an expanded state.

[0037] Figure 4 This is a cross-sectional view of the double-layer main body of the present invention in a compressed state.

[0038] Figure 5 This is a cross-sectional view of the double-layer main body of the present invention in an expanded state.

[0039] Figure 6 This is a schematic diagram of the elastic expander in its compressed state.

[0040] Figure 7 This is a schematic diagram of the elastic expander in its deployed state.

[0041] Figure 8 This is a schematic diagram showing the connection between the fastening ring and the mounting plate.

[0042] Figure 9 This is a cross-sectional view of the interlayer in the compressed state of the double-layer main body of the present invention.

[0043] Figure 10 This is a cross-sectional view of the sandwich layer in the expanded state of the double-layer main body of the present invention.

[0044] Figure 11 This is a side view of the buckle plate of the present invention.

[0045] Figure 12 This is a schematic diagram of the three-dimensional structure of the cover plate.

[0046] Figure 13 This is a schematic diagram of the cross-sectional structure of the cover plate.

[0047] Figure 14 This is a schematic diagram of the application of the present invention in a concrete beam.

[0048] The labels in the attached diagram are as follows: 1. Double-layer main body; 11. Outer wall; 12. Inner wall; 13. Interlayer; 14. Strip notch; 15. Connecting rib; 2. Elastic expander; 21. Spring base; 22. High-strength spring; 23. Support rod; 3. Fastening ring; 31. Mounting plate; 4. Transparent film; 5. Buckle plate; 51. Plate body; 52. Buckle; 6. Cover plate; 61. Ring cover; 62. Ring buckle; 63. First one-way buckle tooth; 64. Slot. Detailed Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0050] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a hinged connection, a rotatable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Example:

[0052] like Figures 1-5 As shown, a reinforcing component for creating openings in the compression zone of a concrete beam includes a hollow tubular double-layer body 1. The double-layer body 1 includes an annular outer wall 11 and an inner wall 12, with a sandwich 13 formed between the outer wall 11 and the inner wall 12. Both the outer wall 11 and the inner wall 12 are provided with a number of strip-shaped notches 14, which divide the outer wall 11 and the inner wall 12 into several independent blocks. Several elastic expanders 2 are provided in the sandwich 13 at the strip-shaped notches 14. When the elastic expanders 2 are in a compressed state, the double-layer body 1 is in a contracted state that closes the strip-shaped notches 14. When the elastic expanders 2 are in an expanded state, the double-layer body 1 is in an expanded state that opens the strip-shaped notches 14.

[0053] The diameter of the newly opened hole in the concrete beam matches the size of the double-layer main body 1 in its expanded state. The double-layer main body 1 is initially in a compressed state, which makes it easy to put the double-layer main body 1 into the hole and adjust its position so that it can better support the hole wall after expansion.

[0054] After the double-layer main body 1 is placed in the hole, the double-layer main body 1 in the compressed state is transformed into an expanded state. Under the action of the elastic expander 2, the outer wall 11 of the double-layer main body 1 fits tightly with the hole wall of the newly opened concrete beam. With the structural adhesive applied to the hole wall and the outer wall 11, the bonding strength between the two is high, the overall bonding between the double-layer main body 1 and the concrete beam is better, and the reinforcement effect is better.

[0055] Furthermore, during the expansion process, the elastic force provided by the elastic expander 2 causes the outer wall 11 to impact the cavity wall, forming impact pressure that compacts the gaps and structural adhesive between the double-layer main body 1 and the cavity wall. This allows the structural adhesive to penetrate into the micropores of the cavity wall or the surface texture of the outer wall, forming a "mechanical interlock." The tiny gaps (such as gaps where the structural adhesive is not completely filled) are eliminated, preventing leakage of the structural adhesive due to insufficient pressure. This enhances the shear and peel resistance of the bond, maximizes the actual contact area between the double-layer main body 1 and the cavity wall, and improves the bonding strength between the outer wall 11 and the cavity wall.

[0056] After expansion, the elastic force of the elastic expander 2 continues to maintain the expansion force of the double-layer main body 1, forming a long-term, stable and effective support for the hole wall, replacing the concrete in the pressure zone that was missing due to the opening, and ensuring the reinforcement effect.

[0057] Multiple elastic expanders 2 are provided in both the radial and axial directions of the double-layer body 1.

[0058] The outer wall surface of the double-layer main body 1 is rough, which improves the tightness of the fit with the concrete beam and the bonding effect is better.

[0059] like Figures 6-7 As shown, the elastic expander 2 includes two spring bases 21 located on both sides of the strip-shaped notch 14. The two ends of each spring base 21 are fixedly connected to the outer wall 11 and the inner wall 12, respectively. Each spring base 21 is equipped with a high-strength spring 22, and a support rod 23 is provided between the two high-strength springs 22. One end of each high-strength spring 22 is fixedly connected to the spring base 21, and the other end is fixedly connected to the support rod 23. The support rod 23 corresponds to the strip-shaped notch 14 and is movably fitted with the double-layered main body 1.

[0060] When the high-strength spring 22 is compressed, the outer wall 11 and inner wall 12 located on both sides of the elastic expander 2 fit together to close the strip-shaped notch 14, and the elastic expander 2 is hidden in the interlayer 13.

[0061] The inner wall 12 is detachably connected to a fastener that maintains the elastic expander 2 in a compressed state.

[0062] The fastening rings can be set in one or more in the double-layer main body 1 according to the width of the concrete beam, so as to ensure that the double-layer main body 1 is in a compressed state as a whole.

[0063] The inner wall has several mounting plates arranged in a ring on its inner side. The fastening ring is fastened to all the mounting plates 31, keeping the elastic expander 2 in a compressed state and achieving a compressed state for the double-layer main body 1. The mounting plates 31 are preferably installed on both sides of the strip-shaped notch 14. The fastening ring 3 is connected to the mounting plate 31 by a snap-fit, and can be directly pulled out for easy installation and removal.

[0064] The fastening ring 3 is made of plastic and can be cut directly for easy removal.

[0065] like Figure 8 As shown, the mounting plate 31 is welded to the inner wall 12. The mounting plate 31 is L-shaped or has a snap-fit ​​groove for the fastening ring 3 to snap on.

[0066] A transparent film 4 is provided on the outer wall 11 at the strip-shaped notch 14, and the two sides of the transparent film 4 are connected to the outer wall 11 on both sides of the strip-shaped notch 14. When the double-layer body 1 is in a compressed state, the transparent film 4 is in a folded state; when the double-layer body 1 is in an unfolded state, the transparent film 4 is in an unfolded state, with a certain tension, sealing the strip-shaped notch. Because the elastic expander 2 expands the double-layer body after unfolding, the outer wall of the double-layer body impacts the concrete cavity wall, and the structural adhesive on the concrete cavity wall and the outer wall 11 will splash due to the impact. The transparent film 4 on the outside of the strip-shaped notch 14 can prevent the structural adhesive from entering the interior of the double-layer body 1 and contaminating the interior space of the double-layer body 1.

[0067] Furthermore, the transparent film 4 has a transparent structure, which makes it easy to observe the saturation of the structural adhesive between the concrete cavity wall and the outer wall 11, and facilitates subsequent adhesive injection and replenishment.

[0068] Furthermore, the transparent film 4 is not very strong. When the buckle 52 of the buckle plate 5 fastens the support rod 23, it will puncture the transparent film 4, causing the buckle plate 5 to come into contact with the structural adhesive, thereby ensuring the integrity and high bonding between the reinforcing component and the hole wall.

[0069] The transparent film 4 is a polymer film.

[0070] like Figures 9-10As shown, the interlayer 13 is further provided with several connecting ribs 15 distributed radially and axially along the double-layer main body 1. One side of the connecting rib 15 is connected to the outer wall 11, and the other side of the connecting rib 15 is connected to the inner wall 12. The connecting ribs 15 avoid the position of the strip notch 14, thereby improving the strength and load-bearing capacity of the double-layer main body 1.

[0071] like Figure 1 As shown, the inner side of the inner wall 12 is provided with a buckle plate 5 at the strip-shaped notch 14. The shape of the buckle plate 5 matches the shape of the strip-shaped notch 14. The buckle plate 5 is used to connect with the double-layer body 1 in the expanded state, close the strip-shaped notch 14, so that the inner surface of the double-layer body 1 forms a complete wall surface, and the support force on the hole wall is more complete and more uniform.

[0072] like Figure 11 As shown, the buckle plate 5 includes a plate body 51, and the plate body 51 is provided with a plurality of buckles 52 that cooperate with and connect with the support rod 23. The buckle plate 5 is fastened to the support rod 23 through the buckles 52, thereby fixing it to the inner wall 12 of the double-layer main body 1 and closing the strip-shaped notch 14.

[0073] like Figure 1 As shown, both ends of the double-layer body 1 are provided with cover plates 6. The cover plates 6 are used to connect with the double-layer body 1 in the expanded state and close the ends of the double-layer body 1.

[0074] like Figure 12 As shown, the cover plate 6 includes a hollow ring cover 61, and a ring buckle 62 is provided on the ring cover 61. The diameter of the ring buckle 62 is smaller than the diameter of the ring cover 61. The interlayer openings at both ends of the double-layer body 1 form slots 64 for the ring buckle 62 to be inserted.

[0075] like Figure 13 As shown, the outer annular surface of the ring buckle 62 is provided with a first one-way buckle tooth 63, and the inner wall of the slot 64 is provided with a second one-way buckle tooth corresponding to and connected to the first one-way buckle tooth 63. The buckle plate 5 is installed onto the double-layer body 1 through the connection of the first one-way buckle tooth 63 and the second one-way buckle tooth, ensuring that it is difficult to remove after installation and has high installation strength.

[0076] The double-layer main body 1 is made of thin-walled steel pipe, and the material is carbon steel, alloy steel, or stainless steel, etc. The mounting plate 31 is a metal part, and the material is the same as that of the double-layer main body 1. The one-way buckle plate 5 is a metal part, and the material is the same as that of the double-layer main body 1.

[0077] like Figure 14 As shown, the present invention provides a method for reinforcing a component for post-opening in the compression zone of a concrete beam, comprising the following steps:

[0078] S1. At the location of the opening behind the beam, a special static cutting tool is used to create the opening. The diameter of the opening corresponds to the size of the expansion reinforcement component used. The opening is located in the compression zone of the concrete.

[0079] S2. Roughen the concrete surface of the tunnel wall and apply high-strength weather-resistant structural adhesive evenly to the tunnel wall.

[0080] S3. Apply high-strength weather-resistant structural adhesive to the rough outer surface of the outer wall 11 of the double-layer main body 1. Hold the fastening ring 3 and insert it into the hole. After fixing the position, cut or remove the fastening ring 3 to remove it, so that the elastic expander 2 expands. The outer wall 11 is tightly attached to the hole wall due to the expansion, and the transparent film 4 unfolds at the same time.

[0081] S4. Observe through the transparent film 4 whether there is any glue leakage between the hole wall and the double-layer body 1.

[0082] S5. If so, use a glue applicator to inject glue at the leak location to repair the leak.

[0083] S6. After the glue application is completed, a metal clip plate 5 is fastened onto the inner wall body 12, so that the inner wall surface of the inner wall body 12 of the double-layer main body 1 forms a complete cylinder wall. The metal clip plate 5 also pierces the transparent film 4 and contacts the hole wall to improve the bonding strength between the reinforcing component and the hole wall.

[0084] S7. Apply adhesive to the back of the ring cover 61 of the cover plate 6, apply adhesive to the wall of the opening, and then insert the cover plate 6 into the slots 64 at both ends of the double-layer body 1 respectively.

[0085] S8. For beams and walls that require fire resistance, after construction is completed, cement mortar should be applied to the outside of the reinforcing components to ensure that the fire resistance performance requirements are met.

[0086] The parts of this invention not described in detail are prior art and therefore will not be specifically described here.

Claims

1. A reinforcing component for creating openings in the compression zone of concrete beams, characterized in that: The double-layer body (1) is hollow and tubular. The double-layer body (1) includes an outer wall (11) and an inner wall (12). A sandwich (13) is formed between the outer wall (11) and the inner wall (12). A number of strip-shaped notches (14) are provided on both the outer wall (11) and the inner wall (12). A number of elastic expanders (2) are provided in the sandwich (13) at the strip-shaped notches (14). When the elastic expanders (2) are in a compressed state, the double-layer body (1) is in a tight state that closes the strip-shaped notches (14). When the elastic expanders (2) are in an expanded state, the double-layer body (1) is in an expanded state that opens the strip-shaped notches (14).

2. The reinforcing component for post-opening in the compression zone of a concrete beam according to claim 1, characterized in that: The elastic expander (2) includes two spring bases (21) located on both sides of the strip-shaped notch (14). The two ends of the spring bases (21) are fixedly connected to the outer wall (11) and the inner wall (12) respectively. High-strength springs (22) are provided on both spring bases (21). A support rod (23) is provided between the two high-strength springs (22). The support rod (23) corresponds to the strip-shaped notch (14).

3. A reinforcing component for post-opening in the compression zone of a concrete beam according to claim 1, characterized in that: The inner wall (12) is detachably connected to a fastening ring (3) that maintains the elastic expander (2) in a compressed state.

4. A reinforcing component for post-opening in the compression zone of a concrete beam according to claim 3, characterized in that: The inner wall (12) has a number of mounting plates (31) arranged in a ring on its inner side, and the fastening ring (3) is fitted onto all the mounting plates (31).

5. A reinforcing component for post-opening in the compression zone of a concrete beam according to claim 1, characterized in that: A transparent film (4) is provided on the outer wall (11) at the strip-shaped notch (14). The two sides of the transparent film (4) are connected to the outer wall (11) on both sides of the strip-shaped notch (14). When the double-layer body (1) is in a compressed state, the transparent film (4) is in a folded state. When the double-layer body (1) is in an unfolded state, the transparent film (4) is in an unfolded state.

6. A reinforcing component for post-opening in the compression zone of a concrete beam according to claim 1, characterized in that: The inner wall (12) is provided with a buckle plate (5) at the strip-shaped notch (14); the buckle plate (5) includes a plate body (51), and the plate body (51) is provided with a plurality of buckles (52) that cooperate with and connect with the support rod (23).

7. A reinforcing component for post-opening in the compression zone of a concrete beam according to claim 1, characterized in that: The double-layer body (1) is provided with cover plates (6) on both ends; the cover plate (6) includes a ring cover (61), the ring cover (61) is provided with a ring buckle (62), and the interlayer (13) openings on both ends of the double-layer body (1) form a slot (64) for the ring buckle (62) to be inserted and installed; the outer annular surface of the ring buckle (62) is provided with a first one-way buckle tooth (63), and the inner wall of the slot (64) is provided with a second one-way buckle tooth corresponding to and connected to the first one-way buckle tooth (63).

8. A reinforcing component for post-opening in the compression zone of a concrete beam according to claim 1, characterized in that: The interlayer (13) is also provided with a number of connecting ribs (15) that are distributed radially and axially along the double-layer body (1). One side of the connecting rib (15) is connected to the outer wall (11), and the other side of the connecting rib (15) is connected to the inner wall (12).

9. A method for reinforcing a reinforcing component for post-opening in the compression zone of a concrete beam according to any one of claims 1-8, characterized in that: Includes the following steps: S1. Make a hole at the position of the opening behind the beam. The diameter of the hole corresponds to the size of the double-layer main body (1) in the expanded state. S2. Roughen the concrete surface of the opening wall and apply structural adhesive evenly to the opening wall. S3. Apply structural adhesive to the outer wall (11) of the double-layer main body (1), insert it into the hole, fix the position, remove the fastening ring (3), so that the elastic expander (2) expands, the outer wall (11) is tightly attached to the hole wall, and the transparent film (4) unfolds. S4. Insert a metal snap plate (5) into the inner wall body (12) so that the inner wall surface of the inner wall body (12) forms a complete cylindrical wall; S5. Apply glue to the back of the ring cover (61) of the cover plate (6), apply glue to the wall of the opening, and then insert the cover plate (6) into both ends of the double-layer body (1).

10. The reinforcement method according to claim 9, characterized in that: Between steps S3 and S4, the following also applies: S41. Observe through the transparent film (4) whether there is any glue leakage between the hole wall and the double-layer body (1); S42. If so, inject glue to fill the leaked area.

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