Building module exhaust passage waterproof structure

Abstract

The utility model discloses a building module exhaust passage waterproof structure, the building module exhaust passage waterproof structure comprises a building module and a first waterproof assembly, the building module comprises a top plate and a bottom plate, and the top plate and the bottom plate are provided with a first hollow structure and a second hollow structure respectively; the first waterproof assembly comprises a first buffer structure, the first buffer structure is located between the edge of the second hollow structure and the exhaust channel, and the height of the first buffer structure is larger than that of the bottom plate. The first buffer structure can prevent accumulated water in the building module from flowing to the exhaust passage so as to prevent the exhaust passage from being corroded; accumulated water in the building module cannot reach the top height of the first buffer structure easily and can only reach the exhaust passage in a mode of slowly penetrating through the first buffer structure, so that the water blocking effect of the first buffer structure is improved; meanwhile, the first buffer structures preliminarily block gaps between the top plates and the bottom plates of the adjacent building modules, and water is prevented from reaching the exhaust passage along the gaps.

Description

Technical Field

[0001] The present application relates to the field of modular buildings, and in particular to a waterproof structure of an exhaust duct of a building module. Background Art

[0002] The bathroom exhaust duct is vital to the normal use of the building. However, the waterproof effect of the bathroom exhaust duct in the modular concrete building box is poor. The water in the bathroom will flow along the bathroom exhaust duct across the horizontal joints of the box and the cavity space to the exhaust duct, causing corrosion on the outer wall of the exhaust duct. Utility Model Content

[0003] In order to solve at least one of the above technical problems, the present application provides a building module exhaust duct waterproof structure, and the technical solution adopted is as follows:

[0004] The present application provides a building module exhaust duct waterproof structure, which includes a building module and a first waterproof component. The building module includes a top plate and a bottom plate. Adjacent building modules are connected to each other through the top plate and the bottom plate to form a stacked arrangement. The top plate and the bottom plate are respectively provided with a first hollow structure and a second hollow structure. The first hollow structure and the second hollow structure are used to accommodate the exhaust duct; the first waterproof component includes a first buffer structure, which is located between the edge of the second hollow structure and the exhaust duct, and the height of the first buffer structure is greater than the height of the bottom plate.

[0005] In certain embodiments of the present application, the base plate is provided with a lifting portion, which is located at the edge of the second hollow structure and extends toward the top of the building module, and the top height of the first buffer structure is greater than the top height of the lifting portion.

[0006] In certain embodiments of the present application, a sealing structure is provided at a corner position between the lifting portion and the bottom plate, and a sealing structure is provided at a corner position between the top of the lifting portion and the first buffer structure.

[0007] In certain embodiments of the present application, the first waterproof component further includes an expansion structure, and the expansion structure is disposed between the top plate and the bottom plate of adjacent building modules to block the gap between the top plate and the bottom plate.

[0008] In certain embodiments of the present application, a casting layer is provided on the top of the top plate, and the expansion structure is provided between the casting layer and the bottom plate to seal a gap between the casting layer and the bottom plate.

[0009] In certain embodiments of the present application, the building module exhaust duct waterproof structure further includes a second waterproof component, the second waterproof component includes a first waterproof layer, and the first waterproof layer covers the top of the base plate.

[0010] In certain embodiments of the present application, the first waterproof layer covers the corner position of the bottom plate and the lifting part, and extends from the side wall of the lifting part to the top of the lifting part; the first waterproof layer covers the corner position of the lifting part and the first buffer structure, and extends to the side wall of the first buffer structure.

[0011] In certain embodiments of the present application, the second waterproof component further includes a second waterproof layer, and the second waterproof layer is disposed on the top of the bottom plate and extends to the side wall of the first buffer structure.

[0012] In certain embodiments of the present application, the second waterproof component also includes a first coating layer and a second coating layer, the first coating layer covers the top of the base plate and extends to the side wall of the first buffer structure, and the first coating layer is attached to the first waterproof layer; the second coating layer is arranged on the top of the base plate and extends to the side wall of the first buffer structure, and the second coating layer is attached to the second waterproof layer.

[0013] In certain embodiments of the present application, the lifting portion forms a lowering plate area on the top of the bottom plate, the lowering plate area is provided with a backfill structure, and the second waterproof layer covers the top of the backfill structure.

[0014] The embodiments of the present application have at least the following beneficial effects: in the present application, the first buffer structure is located between the base plate and the exhaust duct and has a certain thickness, which can prevent the accumulated water in the building module from flowing to the exhaust duct to prevent corrosion in the exhaust duct; the top height of the first buffer structure is greater than the height of the base plate, and the accumulated water in the building module is difficult to reach the top height of the first buffer structure, which prevents water from passing over the top of the first buffer structure and can only reach the exhaust duct by slowly passing through the first buffer structure, thereby enhancing the water-blocking effect of the first buffer structure; at the same time, the first buffer structure preliminarily blocks the gap between the top plate and the base plate of adjacent building modules to prevent water from reaching the exhaust duct along this gap.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1It is a top view of a building module in the building module exhaust duct waterproof structure of the present application;

[0018] Figure 2 It is a top view of the exhaust duct position of the building module in the building module exhaust duct waterproof structure of the present application;

[0019] Figure 3 This is the waterproof structure of the exhaust duct of the building module in this application Figure 2 The cross-sectional view at the AA position;

[0020] Figure 4 This is the waterproof structure of the exhaust duct of the building module in this application Figure 3 A partial enlarged view of the middle I position;

[0021] Figure 5 This is the waterproof structure of the exhaust duct of the building module in this application Figure 3 A partial enlarged view of the II position;

[0022] Figure 6 It is a structural schematic diagram of the spraying process of adjacent exhaust ducts of the exhaust duct waterproof structure of the building module of the present application.

[0023] Reference numerals:

[0024] Building module 101; top plate 102; bottom plate 103; exhaust duct 104; lifting part 105;

[0025] First buffer structure 201; expansion structure 202; casting layer 203; second buffer structure 204;

[0026] First waterproof layer 301; second waterproof layer 302; first coating layer 303; second coating layer 304; backfill structure 305;

[0027] Cement mortar leveling layer 401; basic sealing structure 4021; waterproof sealant 4022; mortar layer 403;

[0028] Processing reserved hole 501; exhaust interface 502; light steel keel wall 503; spraying equipment 504. DETAILED DESCRIPTION

[0029] This section will combine Figures 1 to 6 Embodiments of the present application are described in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] In the description of the present application, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The features defined as "first" and "second" are used to distinguish the feature names, rather than having special meanings. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present application provides a building module exhaust duct waterproof structure, which includes a building module 101, a first waterproof component, and a second waterproof component. An exhaust duct 104 is provided in the building module 101. When a plurality of building modules 101 are stacked, the exhaust ducts 104 in adjacent building modules 101 are butted. Specifically, the building module 101 here includes a bathroom module. During use, water often accumulates in the bathroom module. The accumulated water may reach the position of the exhaust duct 104 along the connection gap between adjacent building modules 101, causing corrosion of the exhaust duct 104.

[0033] The first waterproof component isolates the exhaust duct 104 in the building module 101 and blocks the connection gaps between adjacent building modules 101 to prevent water in the building module 101 from flowing to the exhaust duct 104. On the basis of setting the first waterproof component, the second waterproof component is set inside the building module 101 near the exhaust duct 104 to further enhance the waterproof capability of the building module 101.

[0034] In some examples, the building module 101 includes a top plate 102 and a bottom plate 103, and adjacent building modules 101 are distributed up and down, and the bottom plate 103 of the upper building module 101 is installed on the top plate 102 of the lower building module 101, so that the adjacent building modules 101 are connected to each other. The top plate 102 and the bottom plate 103 are respectively provided with a first hollow structure and a second hollow structure, and the first hollow structure and the second hollow structure are used to accommodate the exhaust duct 104, and the second hollow structure of the upper building module 101 is docked with the first hollow structure of the lower building module 101, thereby forming a connecting channel running through the two building modules 101, and the exhaust duct 104 is docked in the connecting channel.

[0035] Specifically, in the horizontal dimensions of the exhaust duct 104, the length dimension is set to 250 mm, and the width dimension is set to 250 mm. The dimensions of the first hollow structure and the second hollow structure correspond to the dimensions of the exhaust duct 104, ensuring that the exhaust duct 104 can pass through the first hollow structure and the second hollow structure.

[0036] like Figure 3 As shown, the first waterproof component includes a first buffer structure 201, which has a certain thickness and a certain water blocking ability. The first buffer structure 201 extends from the bottom plate 103 toward the top of the building module 101, and the first buffer structure 201 is between the edge of the second hollow structure and the exhaust duct 104, thereby isolating the exhaust duct 104 inside the building module 101. At the same time, the bottom of the first buffer structure 201 extends downward to the top of the lower building module 101, thereby preliminarily blocking the connection gap between adjacent building modules 101.

[0037] Further, the exhaust duct 104 is arranged at an angled position inside the building module 101, and the connecting passage is surrounded by the inner wall of the building module 101 and the first buffer structure 201. It can be understood that the side wall of the exhaust duct 104 includes two planes at an angle to each other, so that the two planes are attached to the angled position of the inner wall of the building module 101, and the rest of the side wall of the exhaust duct 104 is attached to the first buffer structure 201.

[0038] It is worth noting that the accumulated water in the building module 101 needs to pass through the first buffer structure 201 to reach the exhaust duct 104. The first buffer structure 201 is made of concrete and needs to be filled densely. The speed of water passing through the concrete is slow, thereby forming a certain buffering and water-blocking effect. At the same time, the height of the first buffer structure 201 is greater than the height of the base plate 103, and the accumulated water in the building module 101 is difficult to reach the top height of the first buffer structure 201, forming a waterproof structure. The accumulated water in the building module 101 cannot reach the exhaust duct 104 by crossing the top of the first buffer structure 201, and can only reach the exhaust duct 104 by slowly passing through the first buffer structure 201, thereby hindering the lateral movement of the accumulated water in the building module 101. Therefore, the first buffer structure 201 forms a primary water barrier.

[0039] In some examples, the bottom plate 103 is provided with a lifting portion 105 , the height of the lifting portion 105 is greater than the height of the bottom plate 103 , and the lifting portion 105 forms an anti-ridge structure on the bottom plate 103 , and the lifting portion 105 forms a secondary water barrier.

[0040] When the accumulated water in the building module 101 does not reach the top height of the lifting part 105, the accumulated water needs to pass through the lifting part 105 with a certain thickness and the first buffer structure 201 to reach the exhaust duct 104. At this time, the primary water blocking and the secondary water blocking are effective together.

[0041] Furthermore, the top height of the first buffer structure 201 is greater than the top height of the lifting portion 105. Normally, the liquid level of the accumulated water in the building module 101 is difficult to reach the top height of the lifting portion 105, which prevents the accumulated water from flowing over the top of the lifting portion 105 and also prevents the accumulated water from flowing over the top of the first buffer structure 201.

[0042] At the same time, even if the accumulated water passes over the top of the lifting part 105, the liquid level of the accumulated water is difficult to reach the top height of the first buffer structure 201. At this time, for a part of the accumulated water, the first-level water blocking and the second-level water blocking are effective together, and for the other part of the accumulated water, the first-level water blocking is effective alone, which can still ensure a good water blocking effect, thereby preventing the accumulated water from flowing into the exhaust duct 104.

[0043] It can be understood that the lifting portion 105 is located at the edge of the second hollow structure and extends toward the top of the building module 101 . The lifting portion 105 is attached to the side wall of the first buffer structure 201 , and the first buffer structure 201 is clamped between the lifting portion 105 and the exhaust duct 104 .

[0044] In some examples, the thickness of the first buffer structure 201 is set to 50 mm, and the height difference between the top of the first buffer structure 201 and the top of the lifting portion 105 is set to 90 mm.

[0045] like Figure 3As shown, in some examples, the first waterproof component also includes an expansion structure 202, and the expansion structure 202 is located between the top plate 102 and the bottom plate 103 of the adjacent building modules 101. Specifically, the expansion structure 202 is located in the connecting gap of the adjacent building modules 101, and the expansion structure 202 can expand in volume when it encounters water, thereby blocking the connecting gap of the adjacent building modules 101 and preventing water in the connecting gap from flowing to the exhaust duct 104.

[0046] The expansion structure 202 is adjacent to the first buffer structure 201. If the water in the connection gap passes through the expansion structure 202, the water needs to continue to slowly pass through the first buffer structure 201 to reach the exhaust duct 104, thereby hindering the water flowing to the exhaust duct 104 and improving the waterproof effect. Specifically, the expansion structure 202 adopts an expansion water stop strip.

[0047] In some examples, a casting layer 203 is provided on the top of the top plate 102, and the casting layer 203 has a certain thickness, and the connection gap between adjacent building modules 101 is the gap between the bottom plate 103 and the casting layer 203. It can be understood that the expansion structure 202 is located between the casting layer 203 and the bottom plate 103, and blocks the gap between the casting layer 203 and the bottom plate 103 by swelling in water. At the same time, the bottom of the first buffer structure 201 extends downward to the casting layer 203 and is connected to the casting layer 203.

[0048] In some examples, the first waterproof component further includes a second buffer structure 204, which is disposed on the top plate 102 and is located at the edge of the first hollow structure, so that the second buffer structure 204 is clamped between the top plate 102 and the exhaust duct 104, and the top of the second buffer structure 204 is connected to the casting layer 203. Specifically, the second buffer structure 204 is made of concrete, and the thickness of the second buffer structure 204 is set to 50 mm.

[0049] In some examples, the building module exhaust duct waterproof structure further includes a second waterproof component, which further improves the waterproof effect based on the first waterproof component. Since the water in the building module 101 mainly accumulates on the bottom plate 103, the second waterproof component is arranged at the position of the bottom plate 103.

[0050] The second waterproof component includes a first waterproof layer 301, which covers the top of the bottom plate 103 and is located at a position where the bottom plate 103 and the first buffer structure 201 are prone to water seepage into the exhaust duct 104. The first waterproof layer 301 has a water-isolating effect, and the accumulated water in the building module 101 cannot pass through the first waterproof layer 301.

[0051] like Figure 3 and Figure 4As shown, in some examples, the first waterproof layer 301 extends from the top of the bottom plate 103 to the corner position of the bottom plate 103 and the lifting part 105, and extends from the corner position of the bottom plate 103 and the lifting part 105 to the side wall of the lifting part 105. Further, the first waterproof layer 301 extends from the side wall of the lifting part 105 and covers the top of the lifting part 105. At the same time, the first waterproof layer 301 extends to the corner position of the lifting part 105 and the first buffer structure 201, and extends from the corner position to the side wall of the first buffer structure 201, so as to prevent the accumulated water in the building module 101 from penetrating into the exhaust duct 104 from the position covered by the first waterproof layer 301. Specifically, the first waterproof layer 301 is paved with a synthetic polymer coil, and the thickness of the first waterproof layer 301 is set to 1.5 mm.

[0052] like Figure 3 and Figure 5 As shown, in some examples, the lifting part 105 forms a lowering plate area on the top of the bottom plate 103, and the lowering plate area is filled with a backfill structure 305. It can be understood that part of the structure of the first waterproof layer 301 is at the bottom of the backfill structure 305. Specifically, the backfill structure 305 is made of concrete material.

[0053] In some examples, the second waterproof component further includes a second waterproof layer 302 , which is disposed on the top of the base plate 103 . Specifically, the second waterproof layer 302 is disposed on the top of the backfill structure 305 and gradually extends to the side wall of the first buffer structure 201 .

[0054] The second waterproof layer 302 also has a water-isolating effect, and the accumulated water in the building module 101 cannot pass through the second waterproof layer 302. At the same time, the second waterproof layer 302 is paved with a synthetic polymer coiled material, and the thickness of the second waterproof layer 302 is set to 1.5 mm.

[0055] In some examples, a sealing structure is provided at the corner position between the lifting part 105 and the bottom plate 103, and a sealing structure is also provided at the corner position between the top of the lifting part 105 and the first buffer structure 201, and the sealing structure is provided in the form of an arc chamfer. The sealing structure includes a basic sealing structure 4021 and a waterproof sealant 4022, and the water-sealing sealant 4022 covers the top of the basic sealing structure 4021. The basic sealing structure 4021 adopts foamed polyurethane or polyethylene rod and has flexible waterproof performance. The lifting part 105 and the bottom plate 103 form an anti-ridge. If the force is uneven during construction, cracks are likely to occur at the anti-ridge, resulting in water leakage. The corner joint position between the top of the lifting part 105 and the first buffer structure is also prone to water leakage. Therefore, a sealing structure with elasticity is provided at the two corner positions, and the sealing structure can be slightly deformed with the change of force and still have a protective effect.

[0056] It is understandable that when the first waterproof layer 301 and the second waterproof layer 302 are structurally complete, the first waterproof layer 301 and the second waterproof layer 302 form two levels of water blocking, which can prevent the accumulated water in the building module 101 from flowing into the exhaust duct 104. Under the joint action of the first waterproof layer 301, the second waterproof layer 302 and the sealing structure, when there is still accumulated water infiltration, the accumulated water needs to pass through the two-level water blocking of the lifting part 105 and the first buffer structure 201 before reaching the exhaust duct 104. The corrosion phenomenon of the exhaust duct 104 caused by the leakage of accumulated water is fully avoided.

[0057] In some examples, the second waterproof component further includes a first coating layer 303 and a second coating layer 304. The first coating layer 303 covers the top of the bottom plate 103 and extends to the side wall of the first buffer structure 201. The first coating layer 303 is attached to the first waterproof layer 301. The second coating layer 304 is arranged on the top of the bottom plate 103 and extends to the side wall of the first buffer structure 201. The second coating layer 304 is attached to the second waterproof layer 302. Both the first coating layer 303 and the second coating layer 304 are made of polymer cement-based waterproof coatings with a thickness of 2 mm, which further improves the water-proofing effect of the building module 101.

[0058] In some examples, fiberglass cement is sprayed between two exhaust ducts 104 of adjacent building modules 101 to ensure the connection between the two exhaust ducts 104 .

[0059] like Figure 6 As shown, specifically, the intersection of adjacent exhaust ducts 104 needs to be sealed to avoid air leakage. The exhaust duct 104 is provided with an exhaust port 502, and the side wall of the building module 101 is provided with a processing reserved hole 501. The exhaust port 502 is docked with the processing reserved hole 501 to form a spraying processing channel. The spraying equipment 504 reaches the intersection of adjacent exhaust ducts 104 along the spraying processing channel, and sprays glass fiber cement to achieve a sealing effect. Compared with the traditional wall breaking treatment method, this method requires a small construction space, and makes full use of the space of the exhaust port 502 to place the nozzle of the spraying equipment 504 to achieve a lossless effect. At the same time, the sealing is uniform and dense to achieve a leak-proof and waterproof effect. Specifically, the spraying equipment 504 uses a glass fiber cement sprayer.

[0060] In some examples, a light steel frame wall 503 is provided on the side wall of the building module 101, and the light steel frame wall 503 is installed after the bottom plate 103, the lifting part 105, the first buffer structure 201, the first waterproof layer 301, the second waterproof layer 302 and other structures are set up.

[0061] In some examples, a cement mortar leveling layer 401 is provided on the top of the backfill structure 305, and a part of the structure of the second waterproof layer 302 is laid on the top of the cement mortar leveling layer 401. Specifically, the ratio of cement to mortar in the cement mortar leveling layer is 1:2.

[0062] In some examples, a mortar layer 403 is provided between the top plate 102 and the bottom plate 103 of adjacent building modules 101. The mortar layer is made of mortar material. The mortar layer 403 reserves a 20 mm space between the top plate 102 and the bottom plate 103 of adjacent building modules 101 to unify the elevation for leveling the plane.

[0063] In the description of this specification, if the reference terms "one embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" appear, it 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 representation of the above terms does 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.

[0064] The above describes the implementation methods of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A building module exhaust duct waterproof structure, characterized in that: include: A building module, wherein the building module comprises a top plate and a bottom plate, adjacent building modules are connected to each other through the top plate and the bottom plate to form a stacked arrangement, the top plate and the bottom plate are respectively provided with a first hollow structure and a second hollow structure, and the first hollow structure and the second hollow structure are used to accommodate an exhaust duct; A first waterproof component, the first waterproof component includes a first buffer structure, the first buffer structure is located between the edge of the second hollow structure and the exhaust duct, and the height of the first buffer structure is greater than the height of the bottom plate.

2. The building module exhaust duct waterproof structure according to claim 1, characterized in that: The bottom plate is provided with a lifting portion, which is located at the edge of the second hollow structure and extends toward the top of the building module, and the top height of the first buffer structure is greater than the top height of the lifting portion.

3. The building module exhaust duct waterproof structure according to claim 2, characterized in that: A sealing structure is provided at a corner position between the lifting part and the bottom plate, and a sealing structure is provided at a corner position between the top of the lifting part and the first buffer structure.

4. The building module exhaust duct waterproof structure according to claim 1, characterized in that: The first waterproof component further includes an expansion structure, and the expansion structure is arranged between the top plate and the bottom plate of adjacent building modules to block the gap between the top plate and the bottom plate.

5. The building module exhaust duct waterproof structure according to claim 4, characterized in that: A casting layer is arranged on the top of the top plate, and the expansion structure is arranged between the casting layer and the bottom plate to block the gap between the casting layer and the bottom plate.

6. The building module exhaust duct waterproof structure according to claim 2, characterized in that: The building module exhaust duct waterproof structure also includes a second waterproof component, which includes a first waterproof layer, and the first waterproof layer covers the top of the base plate.

7. The building module exhaust duct waterproof structure according to claim 6, characterized in that: The first waterproof layer covers the corner position of the bottom plate and the lifting part, and extends from the side wall of the lifting part to the top of the lifting part; the first waterproof layer covers the corner position of the lifting part and the first buffer structure, and extends to the side wall of the first buffer structure.

8. The building module exhaust duct waterproof structure according to claim 6, characterized in that: The second waterproof component also includes a second waterproof layer, which is arranged on the top of the bottom plate and extends to the side wall of the first buffer structure.

9. The building module exhaust duct waterproof structure according to claim 8, characterized in that: The second waterproof component also includes a first coating layer and a second coating layer, the first coating layer covers the top of the base plate and extends to the side wall of the first buffer structure, and the first coating layer is attached to the first waterproof layer; the second coating layer is arranged on the top of the base plate and extends to the side wall of the first buffer structure, and the second coating layer is attached to the second waterproof layer.

10. The building module exhaust duct waterproof structure according to claim 8, characterized in that: The lifting part forms a lowering plate area on the top of the bottom plate, the lowering plate area is provided with a backfill structure, and the second waterproof layer covers the top of the backfill structure.

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