Waterproof and drainage combined fabricated underground side wall waterproof joint and construction method thereof

Abstract

The invention relates to a prevention and drainage combined fabricated underground side wall waterproof node and a construction method, the node comprises a side wall and a prefabricated middle plate, the side wall comprises an upper prefabricated wall body, a lower prefabricated wall body, a pre-pouring wall body and a post-pouring wall body, and a side wall abutted seam is formed between the upper prefabricated wall body and the lower prefabricated wall body; a cast-in-place concrete construction joint is formed between the firstly-poured wall body and the later-poured wall body, the side wall abutted seam and the cast-in-place concrete construction joint are staggered, a water stop strip and a compression sealing body are arranged in a cushion layer of the side wall abutted seam, and a waterproof material, a water stop steel plate and water stop glue are arranged in the cast-in-place concrete construction joint. The connecting area of the prefabricated middle plate and the side wall is located on the top of the lower prefabricated wall body and is connected with the side wall by pouring concrete in the side wall and middle plate cast-in-place area. The problems that in an existing fabricated underground structure side wall and middle plate waterproof design, the joint waterproof effect is poor, construction is complex, and drainage measures are lacked are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground engineering, and in particular relates to an assembled underground side wall waterproof node combined with drainage and a construction method thereof. Background Art

[0002] In recent years, with the rapid development of prefabricated building technology, the application of prefabricated underground structures in rail transit projects, integrated pipe corridors and underground stations has gradually increased. This type of prefabricated structure is favored by construction projects in various places for its modular construction, efficient assembly and easy control of engineering quality. However, due to its special environmental characteristics, underground structures have particularly strict requirements on waterproof performance. Waterproof performance directly affects the service life and safety of underground structures and is one of the core concerns in the design and construction process. In particular, the side wall nodes of prefabricated underground stations, as an important part of the underground structure, their waterproof effect plays a vital role in the overall structural performance.

[0003] Although the promotion of prefabricated underground structures has made some progress, the design of waterproof nodes on the side walls of prefabricated underground stations is still in its infancy. A unified industry standard has not yet been formed, and there is a lack of mature design solutions for wide reference. This situation has caused many problems in actual projects, such as unclear node design ideas, unreasonable material selection for waterproof structures, and complex waterproof construction processes that are difficult to ensure quality. In addition, since the node position is usually the weakest link in waterproofing, traditional construction methods are difficult to meet the high requirements of modern projects for the waterproof performance of prefabricated underground structures, further limiting their large-scale promotion and application. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a waterproof and drainage combined assembled underground side wall waterproof node and a construction method thereof, so as to solve the problems existing in the existing assembled underground structure side wall and middle plate waterproof design, such as poor node waterproofing effect, complex construction and lack of drainage measures.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A waterproof node for assembled underground side walls combined with drainage comprises a side wall and a prefabricated middle plate, wherein the side wall comprises an upper prefabricated wall, a lower prefabricated wall, a first cast wall and a later cast wall, a side wall joint is formed between the upper prefabricated wall and the lower prefabricated wall, a cast-in-place concrete construction joint is formed between the first cast wall and the later cast wall, the side wall joint and the cast-in-place concrete construction joint are staggered with each other, a water stop strip and a compression sealant are arranged in the cushion layer of the side wall joint, a waterproof material, a water stop steel plate and a water stop glue are arranged in the cast-in-place concrete construction joint, and a connection area between the prefabricated middle plate and the side wall is located at the top of the lower prefabricated wall, and is connected to the side wall by pouring concrete in the cast-in-place area of ​​the side wall and the middle plate.

[0007] Preferably, it also includes a grouting pipe and a water receiving and drainage device. The grouting pipe is pre-buried during the production of the upper prefabricated wall. The drainage device is installed in the connection area between the prefabricated middle plate and the side wall to centrally collect and discharge the leaked water at the side wall joints.

[0008] Preferably, an overlapping surface is formed between the upper prefabricated wall, the lower prefabricated wall, the first cast wall and the later cast wall, and a water stop glue is provided on the overlapping surface.

[0009] Preferably, the side wall joints are sealed and filled with a mortar layer, and a reserved groove for installing the water stop strip is reserved.

[0010] Preferably, the compression sealant is forcibly pressed into the side wall joint by mechanical or manual means after the cast-in-place concrete forms 100% strength.

[0011] Preferably, the waterproof material is a cement-based penetrating crystalline waterproof material, and the water-stopping adhesive is a water-swelling water-stopping adhesive.

[0012] Preferably, the water-stop steel plate is pre-buried in the first-cast wall and fixedly connected to the later-cast wall by cast-in-place concrete.

[0013] On the other hand, the present invention also discloses a construction method of an assembled underground side wall waterproof node based on the above-mentioned waterproof and drainage combination, comprising the following steps:

[0014] S1, pouring the precast wall of the lower prefabricated wall, installing the water-stop steel plate, pouring to the cast-in-place concrete construction joint, cleaning the surface of the cast-in-place concrete construction joint, brushing or spraying waterproof material, and pasting water-expandable water-stop glue on the cast-in-place concrete construction joint;

[0015] S2, after the first cast wall reaches the specified strength, install the precast middle plate and cast concrete in the cast-in-place area of ​​the side wall and middle plate;

[0016] S3, pre-embed the grouting pipe in the upper prefabricated wall and paste the water stop glue on the overlapping surface;

[0017] S4, at the side wall joints between the upper prefabricated wall and the lower prefabricated wall, fill the mortar layer and set a reserved groove to embed the water stop strip, install the upper prefabricated wall, and cast the post-cast wall. After the cast-in-place concrete reaches the design strength, the compression seal is mechanically or manually pressed into the side wall joints;

[0018] S5. Install water inlet and drainage devices at the connection between the side wall and the prefabricated middle plate.

[0019] Preferably, in step S1, when constructing the cast-in-place concrete construction joint, ensure that the surface is clean, free of water and kept moist to enhance the bonding effect between the waterproof material and the concrete.

[0020] Preferably, in step S3, the overlapping surface is cleaned before the water-stop glue is pasted, and after cleaning, the water-stop glue is squeezed out with a special glue injection gun and then pasted on the overlapping surface.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The present invention enhances the waterproof performance of the node from the perspective of design and construction by passing prefabricated components through the node area. At the same time, waterproof materials, waterproof steel plates, waterproof glue, water stop strips and compression seals are arranged in the cast-in-place concrete construction joints, the overlapping surfaces of cast-in-place concrete and prefabricated walls, and the side wall joints in the node area to form three waterproof lines of defense, which greatly improves the overall waterproof performance of the underground structure. In addition, a water receiving and drainage device and a grouting pipe are arranged. When a water leakage event occurs, the leaked water can be collected and effectively discharged. The construction joints and the overlapping surfaces are grouted and repaired multiple times through the grouting pipe to completely block the leakage path and ensure the long-term waterproof effect of the underground structure. The present invention simplifies the construction process and reduces the engineering cost through modular design and standardized construction technology. At the same time, measures such as embedding water stop strips and pressing in compression seals are adopted to further improve the construction quality and node sealing performance, ensuring that the side wall and middle plate node area have excellent waterproof and mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the waterproof structure of the horizontal joint between the side wall and the prefabricated middle plate of the present invention;

[0024] Figure 2 This is a schematic diagram of the installation of the water stop strip of the present invention;

[0025] Figure 3 It is a schematic diagram of the embedding method of the compression sealing body of the present invention.

[0026] Figure numerals: 1-upper prefabricated wall; 2-lower prefabricated wall; 3-first cast wall; 4-later cast wall; 5-overlapping surface; 6-cast-in-place concrete construction joint; 7-waterproof material; 8-waterstop steel plate; 9-waterstop glue; 10-side wall joint; 11-mortar layer; 12-waterstop strip; 13-compression sealant; 14-grouting pipe; 15-water intake and drainage device; 16-cast-in-place area of ​​side wall and middle plate; 17-prefabricated middle plate; 18-reserved groove. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the present invention.

[0028] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0029] See also Figure 1-3 The present embodiment discloses an assembled underground side wall waterproof node combined with drainage, including a side wall and a prefabricated middle plate 17, wherein the side wall includes an upper prefabricated wall 1, a lower prefabricated wall 2, a first cast wall 3, and a later cast wall 4. A side wall joint 10 is formed between the upper prefabricated wall 1 and the lower prefabricated wall 2, and the side wall joint 10 is a joint at the connection of two sections of prefabricated walls. A cast-in-place concrete construction joint 6 is formed between the first cast wall 3 and the later cast wall 4, and the cast-in-place concrete construction joint ensures the continuity of concrete pouring and the sealing of the joint through precise construction. The side wall joint 10 and the cast-in-place concrete construction joint 6 are staggered with each other, and the staggered design avoids the superposition of two weak links at the same horizontal position, thereby reducing the risk of leakage and further improving the waterproof performance of the overall structure.

[0030] A water stop strip 12 and a compression seal 13 are provided in the cushion layer of the side wall joint 10. The water stop strip 12 is used in conjunction with the compression seal 13 to achieve effective sealing of the joint through filling and compression. A waterproof material 7, a water stop steel plate 8 and a water stop glue 9 are provided in the cast-in-place concrete construction joint 6. The waterproof material 7 is a cement-based permeable crystalline waterproof material. This material can penetrate into the concrete and react with the chemical substances in the concrete to generate a water-insoluble crystal structure, thereby sealing the capillary pores in the concrete and improving the overall waterproof performance of the concrete. The water stop glue 9 is a water-expanding water stop glue. This material will expand rapidly after contacting water, fill the gaps in the construction joint or joint, and form an effective dynamic sealing barrier to adapt to the structural micro-deformation caused by temperature or stress changes. The water stop steel plate 8 is pre-buried in the first cast wall 3 and fixedly connected to the later cast wall 4 through cast-in-place concrete. The water stop steel plate 8 acts as a rigid waterproof barrier and can effectively prevent moisture from penetrating along the construction joint. Its embedded position ensures a close bond between the steel plate and the concrete, reducing the risk of possible leakage at the construction joints, while providing higher structural rigidity and stability, thereby improving the waterproofing and durability of the entire node.

[0031] The connection area between the prefabricated middle plate 17 and the side wall is located at the top of the lower prefabricated wall 2, and the side wall and the middle plate cast-in-place area 16 are poured with concrete to connect with the side wall to form an integral structure. This cast-in-place method ensures a firm connection between the prefabricated components, and further enhances the waterproof performance of the node area through waterproof design.

[0032] Furthermore, it also includes a grouting pipe 14 and a water receiving and drainage device 15. The grouting pipe 14 is pre-buried during the production of the upper prefabricated wall 1. The pre-buried design ensures that the grouting pipe 14 can be used for secondary leak repair after the construction of the node area is completed, effectively blocking the leakage path. The water receiving and drainage device 15 is installed in the connection area between the prefabricated middle plate 17 and the side wall. Its function is to quickly collect the leakage water at the side wall joint 10 and guide it for discharge when leakage occurs, so as to prevent the leakage water from spreading to other areas and protect the internal environment of the underground structure.

[0033] In this embodiment, an overlapped surface 5 is formed between the upper prefabricated wall 1, the lower prefabricated wall 2, the first cast wall 3 and the later cast wall 4. The overlapped surface 5 is the key position where the left and right structures contact. In order to prevent this area from becoming a weak point of leakage, a water stop glue 9 is provided at the overlapped surface 5. The water stop glue 9 is a water-swellable material, which is characterized by being able to expand rapidly after contacting water, filling possible gaps in the overlapped surface 5, and further enhancing the sealing performance of the node area. The side wall joint 10 is sealed and filled by the mortar layer 11. The mortar layer 11 is filled in the side wall joint 10, and the initial gap of the joint is closed by the solidification of the mortar. In order to further improve the sealing performance of the joint, a reserved groove 18 for installing the water stop strip 12 is reserved in the side wall joint 10. After the water stop strip 12 is embedded in the reserved groove 18, it works together with the mortar layer 11 to form a reliable waterproof barrier. Through the above-mentioned structural configuration, the node area has higher waterproof and drainage performance, and the construction process is also more convenient and efficient.

[0034] See also Figure 3 After the cast-in-place concrete reaches 100% strength, the compression seal 13 is forcibly pressed into the side wall joint 10 by mechanical or manual means, and the compression seal 13 will be deformed. When the cast-in-place concrete reaches 100% strength, its mechanical properties fully meet the design requirements and can provide sufficient support and sealing performance. At this time, the compression seal 13 is forcibly pressed into the side wall joint 10, which can effectively fill the tiny gaps in the joint, further enhance the sealing effect of the node, and prevent moisture from leaking through the joint.

[0035] In another embodiment, the present invention further discloses a construction method of an assembled underground side wall waterproof node based on the above-mentioned waterproof and drainage combination, comprising the following steps:

[0036] S1, cast the lower prefabricated wall 2 first, cast the wall 3, install the water-stop steel plate 8, cast to the cast-in-place concrete construction joint 6, clean the surface of the cast-in-place concrete construction joint 6, and brush or spray the waterproof material 7, and paste the water-swellable water-stop glue 9 on the cast-in-place concrete construction joint 6.

[0037] In this step, the water-stop steel plate 8, as a rigid waterproof barrier, needs to be precisely positioned and firmly installed in the first cast wall 3 to ensure that it is tightly bonded to the concrete and can effectively prevent moisture from penetrating through the construction joint 6. The cement-based penetrating crystalline waterproof material 7 can penetrate deep into the concrete to generate a water-insoluble crystal structure, thereby sealing the capillary pores of the concrete. The water-swellable water-stop adhesive 9 expands after contacting water and can fill the gaps in the construction joint 6 to form a dynamic sealing effect. When constructing the cast-in-place concrete construction joint 6, ensure that the surface is clean, free of water and kept moist to enhance the bonding effect between the waterproof material 7 and the concrete.

[0038] S2, after the first cast wall 3 reaches the specified strength, the prefabricated middle plate 17 is installed and the concrete pouring of the side wall and the middle plate cast-in-place area 16 is carried out.

[0039] In this step, the wall 3 is first cast to reach the specified strength, for example, more than 80% of the design strength, to ensure that it can bear the subsequent construction load and ensure the stability of the node connection. The concrete pouring of the side wall and the middle plate cast-in-place area 16 forms an integral connection between the prefabricated components, while strengthening the rigidity and sealing performance of the node area.

[0040] S3, embed the grouting pipe 14 in the upper prefabricated wall 1, and stick the waterproof glue 9 on the overlapping surface 5.

[0041] In this step, the grouting pipe 14 is pre-buried in the upper prefabricated wall 1 for secondary grouting after the construction is completed. The overlapping surface 5 is a key connection area, and the sealing is further enhanced by pasting the water-swelling water-stop glue 9. The water-stop glue 9 can fill the gaps in the overlapping surface 5 after contacting with moisture to prevent leakage. The overlapping surface 5 is cleaned before pasting the water-stop glue 9. After cleaning, the water-stop glue 9 is squeezed out with a special glue injection gun and then pasted on the overlapping surface 5. The cleaning of the overlapping surface 5 is very important. It is necessary to ensure that there is no residual dirt, loose particles or impurities on the surface to avoid affecting the bonding performance of the water-stop glue 9. The water-stop glue 9 is extruded by a special glue injection gun and directly pasted on the overlapping surface 5. The water-stop glue 9 can expand rapidly after contacting with moisture and fill the small gaps that may exist in the overlapping surface 5, thereby forming an efficient dynamic seal and ensuring the waterproof performance of the overlapping surface 5.

[0042] S4, fill the mortar layer 11 and set a reserved groove 18 to embed the water stop strip 12 at the side wall joint 10 between the upper prefabricated wall 1 and the lower prefabricated wall 2, install the upper prefabricated wall 1, and cast the post-cast wall 4. After the cast-in-place concrete reaches the designed strength, the compression seal 13 is mechanically or manually pressed into the side wall joint 10.

[0043] In this step, the filling mortar layer 11 can close the initial gap of the side wall joint 10 and provide a good sealing foundation. The reserved groove 18 is used to embed the water stop strip 12, and the water stop strip 12 and the mortar layer 11 work together to form a multi-layer waterproof barrier. After the cast-in-place concrete reaches 100% strength, the compressed sealing body 13 is forcibly pressed into the side wall joint 10 by mechanical or manual means to effectively fill the remaining gap in the joint and further improve the waterproof effect.

[0044] S5, installing a water receiving and drainage device 15 at the connection between the side wall and the prefabricated middle plate 17.

[0045] In this step, the water collection and drainage device 15 is installed in the node area to collect and discharge the leaked water at the side wall joints 10 when leakage occurs, thereby protecting the internal environment of the underground structure and extending its service life.

[0046] Through the above steps, the present invention realizes the multi-level waterproof and drainage functions of the node area. Through the synergistic effect of the water-stop steel plate 8, the cement-based permeable crystalline waterproof material 7 and the water-stop glue 9 that swells when in contact with water, the waterproof effect of the node is greatly improved from the three levels of physical barrier, chemical blocking and dynamic sealing; at the same time, the sealing performance of the node is further improved by embedding the water stop strip 12 in the reserved groove 18, filling the mortar layer 11 and strongly pressing the compressed sealing body 13. The setting of the water receiving and drainage device 15 can quickly collect and discharge the leakage water to avoid the long-term impact of the leakage water on the structure. In addition, by pre-buried grouting pipes 14, secondary leak repair can be achieved after construction to ensure that the node area still maintains excellent waterproof performance even in complex environments.

[0047] In summary, the present invention discloses a waterproof node of an assembled underground side wall combined with water-proofing and drainage and a construction method thereof, including a structural design of a side wall and a prefabricated middle plate. The waterproof performance of the node area is significantly improved by combining an upper prefabricated wall, a lower prefabricated wall, a first-cast wall and a later-cast wall, and a multi-line waterproofing design of the side wall joints and cast-in-place concrete construction joints. The present invention sets multi-layer waterproofing measures such as water-stop steel plates, cement-based permeable crystalline waterproof materials, and water-expanding water-stopping glue at key positions of the nodes. At the same time, by pre-buried grouting pipes and setting water connection and drainage devices, the centralized collection, discharge, and secondary repair of leaks are realized, further ensuring the performance of the underground structure. Through the above technical scheme, the present invention realizes efficient waterproofing and drainage of the node area, enhances the overall safety, durability and performance of the assembled underground structure, simplifies the construction process, improves the construction efficiency, and reduces the engineering cost. The present invention is particularly suitable for solving the problems of leakage and insufficient sealing performance existing in the design of waterproof nodes of existing assembled underground structures, and provides an innovative and practical technical solution for the industry. The present invention can be widely used in the waterproof design of side walls of prefabricated underground structures such as underground stations in rail transit projects and integrated pipe galleries. It has important promotion value and practical significance, and has a positive impact on promoting the development and application of prefabricated underground structure technology.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waterproof joint for underground side walls combined with drainage and waterproofing, characterized in that: The invention comprises a side wall and a prefabricated middle plate (17), wherein the side wall comprises an upper prefabricated wall body (1), a lower prefabricated wall body (2), a first cast wall body (3), and a second cast wall body (4), wherein a side wall joint (10) is formed between the upper prefabricated wall body (1) and the lower prefabricated wall body (2), a cast-in-place concrete construction joint (6) is formed between the first cast wall body (3) and the second cast wall body (4), and the side wall joint (10) and the cast-in-place concrete construction joint are (6) are staggered with each other, a water stop strip (12) and a compression seal (13) are arranged in the cushion layer of the side wall joint (10), a waterproof material (7), a water stop steel plate (8) and a water stop glue (9) are arranged in the cast-in-place concrete construction joint (6), and the connection area between the prefabricated middle plate (17) and the side wall is located at the top of the lower prefabricated wall (2), and is connected to the side wall by pouring concrete in the cast-in-place area (16) between the side wall and the middle plate.

2. The assembled underground side wall waterproof node combined with drainage according to claim 1 is characterized in that: It also includes a grouting pipe (14) and a water receiving and drainage device (15), wherein the grouting pipe (14) is pre-buried during the production of the upper prefabricated wall (1), and the drainage device (15) is installed in the connection area between the prefabricated middle plate (17) and the side wall, and is used to centrally collect and discharge the leaked water at the side wall joint (10).

3. The waterproof node of the assembled underground side wall combined with drainage according to claim 2 is characterized in that: An overlapping surface (5) is formed between the upper prefabricated wall (1), the lower prefabricated wall (2), the first cast wall (3), and the second cast wall (4), and a water stop glue (9) is provided on the overlapping surface (5).

4. The waterproof node of the assembled underground side wall combined with drainage according to claim 3 is characterized in that: The side wall joint (10) is sealed and filled with a mortar layer (11), and a reserved groove (18) is reserved for installing the water stop strip (12).

5. The waterproof node of the assembled underground side wall combined with drainage according to claim 4 is characterized in that: The compression seal (13) is forcibly pressed into the side wall joint (10) by mechanical or manual means after the cast-in-place concrete forms 100% strength.

6. The waterproof node of the assembled underground side wall combined with drainage according to claim 5 is characterized in that: The waterproof material (7) is a cement-based permeable crystallization waterproof material, and the water-stopping adhesive (9) is a water-swelling water-stopping adhesive.

7. The waterproof node of the assembled underground side wall combined with drainage according to claim 1 is characterized in that: The water-stop steel plate (8) is pre-buried in the first-cast wall (3) and is fixedly connected to the second-cast wall (4) by cast-in-place concrete.

8. A construction method for a prefabricated underground side wall waterproof node combined with drainage according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, pouring the first pouring wall (3) of the lower prefabricated wall (2), installing the waterproof steel plate (8), pouring to the cast-in-place concrete construction joint (6), cleaning the surface of the cast-in-place concrete construction joint (6), brushing or spraying the waterproof material (7), and pasting the water-expandable waterproof glue (9) on the cast-in-place concrete construction joint (6); S2, after the first cast wall (3) reaches the specified strength, the prefabricated middle plate (17) is installed and the concrete of the side wall and the middle plate cast-in-place area (16) is poured; S3, pre-embed a grouting pipe (14) in the upper prefabricated wall (1), and adhere a waterproof glue (9) to the overlapping surface (5); S4, at the side wall joint (10) between the upper prefabricated wall (1) and the lower prefabricated wall (2), fill the mortar layer (11) and set a reserved groove (18) to embed the water stop strip (12), install the upper prefabricated wall (1), cast the post-cast wall (4), and after the cast-in-place concrete reaches the designed strength, mechanically or manually press the compression seal (13) into the side wall joint (10); S5, installing a water receiving and drainage device (15) at the connection between the side wall and the prefabricated middle plate (17).

9. The construction method of the waterproof node of the assembled underground side wall combined with drainage according to claim 8 is characterized in that: In step S1, when constructing the cast-in-place concrete construction joint (6), ensure that the surface is clean, free of water and kept moist to enhance the bonding effect between the waterproof material (7) and the concrete.

10. The construction method of the waterproof node of the assembled underground side wall combined with drainage according to claim 9 is characterized in that: In step S3, the overlapping surface (5) is cleaned before the waterproof glue (9) is pasted. After cleaning, the waterproof glue (9) is squeezed out using a special glue injection gun and then pasted on the overlapping surface (5).

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