Assembly type modular building toilet joint waterproof construction process method

Abstract

This invention relates to a waterproofing construction process for the joints of prefabricated modular bathrooms, belonging to the field of prefabricated modular building construction technology. It includes prefabricated bathroom module units, with doors and windows installed on the walls of these units. During the factory prefabrication and installation of windows, the joints between the window sides and the wall, as well as the joints between the window top and the wall, are simultaneously treated. After two prefabricated bathroom module units are vertically stacked and installed in sequence by hoisting, a ground joint is formed between the prefabricated bathroom module unit and the adjacent room module. Appropriate waterproofing treatment is applied to this ground joint. This invention has the following advantages: it solves the problem of water leakage or seepage at the joints of modular bathrooms in existing concrete modular buildings during production and construction, and provides a prefabricated waterproof structure that can be quickly overlapped on-site, reducing damage to waterproofing materials during construction.

Description

Technical Field

[0001] This invention relates to a construction process for waterproofing the joints of prefabricated modular building bathrooms, belonging to the field of prefabricated modular building construction technology. Background Technology

[0002] Modular buildings, with their advantages of high prefabrication rate, short construction cycle and green environmental protection, have become an important development direction for the transformation and upgrading of the construction industry. Among them, concrete modular construction (MIC) is increasingly widely used in residential, commercial buildings and other fields due to its strong structural stability and wide range of applications.

[0003] Waterproofing is a crucial component of building construction, designed to protect the structure and interior spaces of buildings from water damage. It plays a vital role in the overall construction process. Waterproofing involves various parts of a building or structure, including basements, walls, floors, roofs, and more. Its function is to prevent rainwater and domestic / industrial water leakage and erosion by groundwater within the building's design lifespan, ensuring the building structure and interior spaces remain undamaged and providing a comfortable and safe living environment.

[0004] Waterproofing refers to measures taken in building materials and construction to prevent water penetration into certain parts of a building. It is commonly used on roofs, underground structures, underground parts of buildings, interior spaces requiring waterproofing, and water storage structures. Based on the different measures and methods employed, it is divided into two main categories: material waterproofing and structural waterproofing. Material waterproofing relies on building materials to block the path of water to achieve waterproofing or increase resistance to leakage, such as waterproof membranes, coatings, rigid waterproofing with concrete and cement mortar, and waterproofing with clay and lime-soil mixtures. Structural waterproofing, on the other hand, uses appropriate structural forms to block the path of water to achieve waterproofing, such as waterstops and cavity structures.

[0005] Bathroom waterproofing refers to the concealed waterproofing work carried out in the bathroom using waterproofing materials. Its main function is to prevent water leakage to the floor below or walls, ensuring building safety and neighborly relations. According to national regulations, although developers may have performed basic waterproofing before handing over the property, the actual waterproofing effect is often insufficient for daily use. Therefore, a secondary waterproofing project must be implemented during renovation. This project involves processes such as base treatment, cement mortar leveling, additional layer construction, and application of an acrylic waterproofing layer, with a focus on treating floor drains, pipe roots, and corners. Construction specifications require two water retention tests and a layered treatment method of 30cm wall waterproofing and 180cm shower area waterproofing. Recessed bathrooms require additional special processes such as the installation of drainage pipes and waterproofing devices to ensure smooth drainage.

[0006] In existing modular integrated building structure construction technologies, to ensure reliable waterproofing during the joint construction process of bathrooms and to minimize the risk of leakage or seepage during bathroom construction, we have fully considered the joint forms of modular bathrooms with adjacent module units, prefabricated components, and cast-in-place structural parts during the modular integrated building assembly process, and have formulated corresponding joint treatment and construction process requirements for each.

[0007] Waterproofing is a critical issue for highly integrated modular building structures. The difference between waterproofing modular concrete buildings and cast-in-place structures lies in the increased number of horizontal and vertical joints between prefabricated components, which increases the risk of water seepage. Moisture can enter the joints due to various factors. Furthermore, because concrete is a hydrophilic material, water can seep into the joints under surface tension. Traditional designs are prone to damage during the application of waterproofing materials. Addressing waterproofing issues from the prefabrication stage allows for excellent control over waterproofing installation errors and ensures the quality of waterproofing construction.

[0008] Therefore, developing a prefabricated modular building bathroom joint waterproofing construction process that can adapt to the high prefabrication rate of modular buildings, simplify the construction process, and ensure construction quality has become a technical direction that urgently needs to be addressed by those skilled in the art.

[0009] To solve one of the above problems, there is an urgent need for a construction process for waterproofing the joints of prefabricated modular building bathrooms. Summary of the Invention

[0010] Based on the shortcomings of the existing technology, the technical problem to be solved by the present invention is: how to solve the problem of water leakage or seepage at the joints of modular bathrooms in existing concrete modular buildings during production and construction, and at the same time provide a prefabricated waterproof structure that can be quickly assembled on site, reducing damage to waterproof materials on the construction site. To this end, a construction process method for waterproofing the joints of prefabricated modular building bathrooms is provided.

[0011] The prefabricated modular building bathroom joint waterproofing construction process of this invention includes prefabricated bathroom module units, each prefabricated bathroom module unit having an upper module bottom plate and a lower module top plate. The upper module bottom plate and lower module top plate of the same prefabricated bathroom module unit are connected by a wall. The key feature is that doors and windows are installed on the walls of the prefabricated bathroom module units. During the factory prefabrication and installation of the windows, the construction treatment of the joints between the window side and the wall, as well as the construction treatment of the joints between the window top and the wall, are carried out simultaneously. After two prefabricated bathroom module units are installed vertically stacked in sequence by hoisting, a ground joint structure is formed between the prefabricated bathroom module unit and the adjacent room module. The construction process of the ground joint structure is as follows:

[0012] S1, during the prefabrication of the base plate of the prefabricated bathroom module unit in the factory, the waterproof coating on the upper layer of the base plate of the prefabricated bathroom module unit is applied to the door and window openings, and fiberglass mesh is added around the openings and wrapped outwards.

[0013] S2, a water-stopping curb is set on the base plate, and a groove is made on the top of the water-stopping curb to embed a water-swellable rubber strip into the groove.

[0014] S3, Apply appropriate waterproofing treatment to the joints in the ground.

[0015] In any of the above solutions, the preferred method is to perform appropriate waterproofing treatment at the ground joint structure in step S3, specifically as follows: First, seal the bottom of the ground joint with PU foam; then embed a PE rod into the upper end of the PU foam; apply waterproof sealant to the upper end of the PE rod, with a sealant thickness of not less than 20mm; finally, fill with waterproof mortar; apply a layer of polymer cement waterproof coating to the door opening areas on both sides of the joint between the bathroom module and the room module, and to the joint at the door opening, extending 500mm outside the door opening; at the joint at the opening of the bathroom module and the room module, use waterproof mortar to solidify, and lay a threshold stone on top of the waterproof mortar.

[0016] In any of the above embodiments, it is preferred that the waterproof sealant is an existing MS modified silane waterproof sealant.

[0017] In any of the above solutions, it is preferred that a mortar layer A and a cast-in-place layer are sequentially provided below the bottom plate of the room assembly module.

[0018] In any of the above solutions, it is preferred that, during on-site construction and installation, the metal pipes and floor drains inside the prefabricated bathroom module units on the upper and lower adjacent floors be waterproofed and leak-proofed.

[0019] In any of the above solutions, the preferred method for sealing the metal pipes passing through the upper and lower bathroom module units includes the following steps: Before hoisting the upper and lower bathroom module units, steel sleeve A and rubber sleeve A are pre-embedded at corresponding positions on the bottom plate of the adjacent upper module and the top plate of the lower module, respectively. The inner diameter of the rubber sleeve A is the same as that of the steel sleeve A, and the upper end of the rubber sleeve A protrudes 20mm-30mm from the upper end of the steel sleeve A. During production, the upper edge of the rubber sleeve A is sealed with tape. The opening is sealed, and the sealing tape is removed before hoisting the upper module. After hoisting the upper and lower modules, the sanitary ware drain pipe or drain riser is installed through the pre-embedded steel sleeve A and rubber sleeve A. The lower drain pipe is glued through the pre-embedded water-stop joint, and a fire-resistant ring or decorative cover is installed on the top of the lower module. There is a cast-in-place layer and a grout layer between the bottom plate of the upper module and the top plate of the lower module. Waterproof sealant is used to fill the gap between the steel sleeve A, rubber sleeve A and the drain pipe. The surface of the bottom plate of the upper module has a bathroom waterproof layer.

[0020] In any of the above solutions, it is preferred that the bathroom waterproof layer is a single-component polyurethane waterproof coating.

[0021] In any of the above schemes, the preferred method for the waterproofing node of the prefabricated bathroom module unit is as follows: a water-stop joint is pre-embedded on the bottom plate of the upper module, and a rubber sleeve B and a steel sleeve B are pre-embedded at the corresponding positions on the top plate of the lower module. The inner diameter of the steel sleeve B is equal to the outer diameter of the rubber sleeve B. After the upper and lower bathroom module units are hoisted, PVC drainage pipes are installed through the pre-embedded water-stop joint, steel sleeve B, and rubber sleeve B. Waterproof sealant is used to fill the gap between the steel sleeve B, rubber sleeve B, and PVC pipes. Cement mortar is used to smooth the gap between the pre-embedded water-stop joint and the bottom plate of the upper module, and a single-component polyurethane waterproof coating is applied.

[0022] In any of the above solutions, the preferred method is to construct the joint between the window side and the wall, including the following steps: the wall of the prefabricated bathroom module unit should first undergo external waterproofing and thermal insulation treatment. JS-Ⅱ type polymer cement waterproof coating is applied between the external waterproofing and thermal insulation layers. The external wall finishing layer should not be more than 5mm thick over the window frame. When installing the window, the hot-dip galvanized steel subframe is fixed to the joint between the window and the wall with rivets. The joint between the hot-dip galvanized steel subframe and the wall is filled with waterproof mortar, and polyurethane foam is used for grouting. A layer of waterproof sealant is applied to the surface, and the window frame is fixed to the hot-dip galvanized steel subframe. Sealant is applied between the window frame and the wall for sealing treatment.

[0023] JS-Ⅱ type polymer cement waterproof coating, commonly referred to as JS-II waterproof coating, is a two-component water-based coating widely used in building waterproofing projects.

[0024] In any of the above solutions, it is preferred that the construction treatment of the joint between the top of the window and the wall is the same as the construction treatment of the joint between the side of the window and the wall.

[0025] In any of the above-mentioned schemes, it is preferred that, when hoisting prefabricated bathroom module units at the construction site, if the lower structure is a cast-in-place reinforced concrete structural slab, the prefabricated bathroom module unit should first be covered with mortar according to the design requirements on the cast-in-place reinforced concrete structural slab to form module mortar layer B. Then, the bathroom module unit is installed. At the corner where the wall and floor of the prefabricated bathroom module unit meet, the surface of the module wall of the prefabricated bathroom module unit has an inner wall waterproof layer, the bottom plate of the prefabricated bathroom module unit has a bathroom floor waterproof layer, the connection between the wall and the bottom plate is a chamfered corner at the bottom corner of the bathroom unit, the inner wall waterproof layer has a decorative surface layer, and the surface of the bathroom floor waterproof layer has floor tiles.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The prefabricated modular building bathroom joint waterproofing construction process described in this invention solves the problem of water leakage or seepage at the joints of modular bathrooms in existing concrete modular buildings during production and construction. At the same time, it provides a prefabricated waterproof structure that can be quickly overlapped on site, reducing damage to waterproof materials during construction.

[0028] The prefabricated modular building bathroom joint waterproofing construction process described in this invention completes the integrated production of modular components and waterproofing structures in the factory, as well as the on-site waterproofing treatment at the joints, reducing on-site workload and effectively addressing the waterproofing issues at the joints between bathroom modules.

[0029] The prefabricated modular building bathroom joint waterproofing construction process described in this invention reduces labor and time costs, significantly improves construction efficiency, ensures the reliability of project quality, and conforms to the new development concept of green building.

[0030] The prefabricated modular building bathroom joint waterproofing construction process described in this invention can significantly reduce the workload of construction and subsequent maintenance procedures.

[0031] The prefabricated modular building bathroom joint waterproofing construction process described in this invention effectively ensures the safety, applicability, and durability of the bathroom module units and modular building structures. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0033] Figure 1 This is a planar schematic diagram of the present invention. Figure 1 ;

[0034] Figure 2 A structural diagram of the ground joint construction;

[0035] Figure 3 This is a structural diagram of the intersection of the bathroom wall and floor.

[0036] Figure 4 Schematic diagram of the method for sealing metal pipes passing through upper and lower module sleeves;

[0037] Figure 5 This is a schematic diagram of a waterproofing node for a floor drain.

[0038] Figure 6 Schematic diagram of the construction method at the joint between the window side and the wall;

[0039] Figure 7 Schematic diagram of the construction method at the joint between the window top and the wall;

[0040] In the diagram: 1. Prefabricated bathroom module unit; 2. Room assembly module; 3. Water-stop curb; 4. Water-swellable rubber strip; 5. PU foaming agent; 6. PE rod; 7. Waterproof sealant; 8. Waterproof mortar; 9. Threshold stone; 10. Cast-in-place layer; 11. Mortar layer A; 12. Box bottom plate; 13. Cast-in-place reinforced concrete structural slab; 14. Mortar layer B; 15. Interior wall waterproof layer; 16. Bathroom floor waterproof layer; 17. Corner cut at the inside and outside corners of the bathroom box bottom; 18. Finishing surface layer; 19. Floor tiles; 20. Rubber sleeve A; 21. Lower drainage pipe; 22. Waterproof sealant; 23. Drainage riser; 24. Embedded water-stop joint; 25. Fire collar; 26. Steel sleeve A; 27. Upper module bottom plate; 28. Lower module top plate; 29. ​​Steel pipe sleeve B; 30. Rubber pipe sleeve B; 31. PVC pipe. Detailed Implementation

[0041] The present invention will now be further described with reference to the accompanying drawings:

[0042] The present invention will be further illustrated by specific embodiments below, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0043] Example 1, such as Figure 1-2 As shown, the prefabricated modular building bathroom joint waterproofing construction method includes prefabricated bathroom module units. Each prefabricated bathroom module unit 1 has an upper module base plate 27 and a lower module top plate 28. The upper module base plate 27 and lower module top plate 28 of the same prefabricated bathroom module unit 1 are connected by a wall. Doors and windows are installed on the walls of the prefabricated bathroom module unit 1. During the factory prefabrication and installation of the windows, the construction treatment of the joints between the window side and the wall, as well as the construction treatment of the joints between the window top and the wall, are carried out simultaneously. After two prefabricated bathroom module units 1 are installed vertically in sequence by hoisting, a ground joint structure is formed between the prefabricated bathroom module unit and the adjacent room assembly module 2. The construction process of the ground joint structure is as follows:

[0044] S1, when the base plate of the prefabricated bathroom module unit 1 is prefabricated in the factory, the waterproof coating on the upper layer of the base plate of the prefabricated bathroom module unit 1 is applied to the door and window openings, and fiberglass mesh is added around the openings and wrapped outwards.

[0045] S2, a water-stopping curb 3 is set on the base plate, and a groove is made on the top of the water-stopping curb 3, and a water-swellable rubber strip 4 is embedded in the groove.

[0046] S3, Apply appropriate waterproofing treatment to the joints in the ground.

[0047] This invention addresses the issue of water leakage or seepage at the joints of modular bathrooms in existing modular concrete buildings during production and construction. It also provides a prefabricated waterproof structure that can be quickly assembled on-site, reducing damage to waterproof materials during construction.

[0048] The method of this invention forms a set of prefabricated modular building bathroom joint waterproofing construction process, which completes the integrated production of modular and waterproof structures in the factory and the waterproofing treatment of joints on site, reducing on-site work pressure and effectively solving the waterproofing problem at the joints between bathroom modules.

[0049] Example 2, as Figure 1-7As shown, the prefabricated modular building bathroom joint waterproofing construction method includes prefabricated bathroom module units. Each prefabricated bathroom module unit 1 has an upper module base plate 27 and a lower module top plate 28. The upper module base plate 27 and lower module top plate 28 of the same prefabricated bathroom module unit 1 are connected by a wall. Doors and windows are installed on the walls of the prefabricated bathroom module unit 1. During the factory prefabrication and installation of the windows, the construction treatment of the joints between the window side and the wall, as well as the construction treatment of the joints between the window top and the wall, are carried out simultaneously. After two prefabricated bathroom module units 1 are installed vertically in sequence by hoisting, a ground joint structure is formed between the prefabricated bathroom module unit and the adjacent room assembly module 2. The construction process of the ground joint structure is as follows:

[0050] S1, when the base plate of the prefabricated bathroom module unit 1 is prefabricated in the factory, the waterproof coating on the upper layer of the base plate of the prefabricated bathroom module unit 1 is applied to the door and window openings, and fiberglass mesh is added around the openings and wrapped outwards.

[0051] S2, a water-stopping curb 3 is set on the base plate, and a groove is made on the top of the water-stopping curb 3, and a water-swellable rubber strip 4 is embedded in the groove.

[0052] S3, Apply appropriate waterproofing treatment to the joints in the ground.

[0053] Further, in step S3, corresponding waterproofing treatment is performed at the ground joint structure. The specific steps are as follows: First, PU foam 5 is used to seal the joint at the bottom of the ground joint; then, PE rod 6 is embedded on the upper end of PU foam 5; waterproof sealant 7 is applied to the upper end of PE rod, and the sealant thickness is not less than 20mm.

[0054] Finally, fill the gaps with waterproof mortar 8; apply a layer of polymer cement waterproof coating to the door opening area on both sides of the joint between the bathroom module and the room module, and to the joint at the door opening, extending 500mm outside the door opening; at the joint between the bathroom module and the room module openings, use waterproof mortar 8 to seal the gaps, and lay a threshold stone 9 on top of the waterproof mortar.

[0055] Furthermore, the waterproof sealant 7 is an existing MS modified silane waterproof sealant.

[0056] Furthermore, a mortar layer A11 and a cast-in-place layer 10 are sequentially arranged below the bottom plate 12 of the room assembly module 2.

[0057] Furthermore, during the on-site construction and installation process, the metal pipes and floor drains inside the prefabricated bathroom module unit 1 on the two adjacent floors are treated for waterproofing and seepage prevention.

[0058] Furthermore, the method for sealing the metal pipes passing through the upper and lower bathroom module units includes the following steps: Before hoisting the upper and lower bathroom module units, steel sleeves A26 and rubber sleeves A20 are pre-embedded at corresponding positions on the bottom plate 27 of the adjacent upper module and the top plate 28 of the lower module, respectively. The inner diameter of the rubber sleeve A is the same as the inner diameter of the steel sleeve A26, and the upper end of the rubber sleeve A protrudes 20mm-30mm from the upper end of the steel sleeve A. During production, the upper edge opening of the rubber sleeve A is sealed with tape. Remove the sealing tape before installing the upper module; after hoisting the upper and lower modules, install the sanitary ware drain pipe or drain riser 23 through the pre-embedded steel sleeve A and rubber sleeve A, and use glue to bond the lower drain pipe 21 through the pre-embedded water-stop joint 24, and install the fire arrestor ring 25 or decorative cover on the top of the lower module; there is a cast-in-place layer and a grouting layer between the upper module bottom plate 27 and the lower module top plate 28, and waterproof sealant 22 is used to fill the gap between the steel sleeve A, rubber sleeve A and the drain pipe, and the surface of the upper module bottom plate 27 has a bathroom waterproof layer.

[0059] Furthermore, the bathroom waterproof layer is a single-component polyurethane waterproof coating.

[0060] Furthermore, the waterproofing details of the prefabricated bathroom module unit 1 are as follows: a water-stop joint is pre-embedded on the upper module base plate 27, and rubber sleeve B30 and steel sleeve B29 are pre-embedded at corresponding positions on the lower module top plate 28. The inner diameter of the steel sleeve B29 is equal to the outer diameter of the rubber sleeve B30. After the upper and lower bathroom module units are hoisted, PVC drainage pipes 31 are installed through the pre-embedded water-stop joints, steel sleeve B29, and rubber sleeve B30. Waterproof sealant is used to fill the gap between the steel sleeve B29, rubber sleeve B30, and PVC pipe. Cement mortar is used to smooth the gap between the pre-embedded water-stop joint and the upper module base plate 27, and a single-component polyurethane waterproof coating is applied.

[0061] Furthermore, the construction treatment at the joint between the window side and the wall includes the following steps: The wall of the prefabricated bathroom module unit 1 should first undergo external waterproofing and thermal insulation treatment. JS-Ⅱ type polymer cement waterproof coating is applied between the external waterproofing and thermal insulation layers. The external wall finishing layer should not be more than 5mm thick over the window frame. When installing the window, the hot-dip galvanized steel sub-frame is fixed to the joint between the window and the wall with rivets. The joint between the hot-dip galvanized steel sub-frame and the wall is filled with waterproof mortar, and polyurethane foam is used for grouting. A layer of waterproof sealant is applied to the surface, and the window frame is fixed to the hot-dip galvanized steel sub-frame. Sealant is applied between the window frame and the wall for sealing treatment.

[0062] JS-Ⅱ type polymer cement waterproof coating, commonly referred to as JS-II waterproof coating, is a two-component water-based coating widely used in building waterproofing projects.

[0063] Furthermore, the construction treatment at the joint between the top of the window and the wall is the same as the construction treatment at the joint between the side of the window and the wall.

[0064] Furthermore, when hoisting the prefabricated bathroom module unit 1 at the construction site, if the lower structure is a cast-in-place reinforced concrete structural slab 13, when hoisting and positioning the prefabricated bathroom module unit 1, the mortar should first be laid on the cast-in-place reinforced concrete structural slab according to the design requirements to form a module mortar layer B14. Then, the bathroom module unit is positioned and installed. At the corner where the wall and floor of the prefabricated bathroom module unit 1 meet, the surface of the module wall of the prefabricated bathroom module unit 1 has an inner wall waterproof layer 15, the bottom plate of the prefabricated bathroom module unit 1 has a bathroom floor waterproof layer 16, the connection between the wall and the bottom plate is a chamfered corner 17 at the bottom corner of the bathroom box, the inner wall waterproof layer 15 has a decorative surface layer 18, and the surface of the bathroom floor waterproof layer 16 has floor tiles 19.

[0065] The prefabricated modular building bathroom joint waterproofing construction process described in this invention reduces labor and time costs, significantly improves construction efficiency, ensures the reliability of project quality, and conforms to the new development concept of green building.

[0066] The prefabricated modular building bathroom joint waterproofing construction process described in this invention can significantly reduce the workload of construction and subsequent maintenance procedures.

[0067] The prefabricated modular building bathroom joint waterproofing construction process described in this invention effectively ensures the safety, applicability, and durability of the bathroom module units and modular building structures.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0069] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A method for waterproofing joints in prefabricated modular bathroom construction, comprising prefabricated bathroom module units, each prefabricated bathroom module unit having an upper module bottom plate and a lower module top plate, wherein the upper module bottom plate and the lower module top plate of the same prefabricated bathroom module unit are connected by a wall, characterized in that: The prefabricated bathroom module unit has doors and windows installed on its walls. During the factory prefabrication and installation of the windows, the construction treatment of the joints between the window side and the wall, as well as the construction treatment of the joints between the window top and the wall, are carried out simultaneously. After two prefabricated bathroom module units are installed vertically and stacked in sequence by hoisting, a ground joint structure is formed between the prefabricated bathroom module unit and the adjacent room assembly module. The construction process of the ground joint structure is as follows: S1, when the base plate of the prefabricated bathroom module unit is prefabricated in the factory, the top layer of the waterproof coating of the base plate of the prefabricated bathroom module unit is applied to the door and window openings, and fiberglass mesh is added around the openings and wrapped outwards; S2, a water-stop curb is set on the base plate, and a groove is made on the top of the water-stop curb, and a water-swellable rubber strip is embedded in the groove; S3, the corresponding waterproof treatment is carried out at the ground joint structure.

2. The construction process for waterproofing joints in prefabricated modular building bathrooms according to claim 1, characterized in that, Step S3 involves applying waterproofing treatment to the joints in the floor. The specific steps are as follows: First, seal the bottom of the joint with PU foam. Then, embed a PE rod into the upper part of the PU foam. Apply waterproof sealant to the upper part of the PE rod, with a sealant thickness of not less than 20mm. Finally, fill the joint with waterproof mortar. Apply a layer of polymer cement waterproof coating to the door opening areas on both sides of the joint between the bathroom module and the room module, extending 500mm beyond the door opening. At the joint between the openings of the bathroom module and the room module, use waterproof mortar to seal the joint, and lay a threshold stone on top of the waterproof mortar.

3. The construction process for waterproofing joints in prefabricated modular building bathrooms according to claim 2, characterized in that, During on-site construction and installation, waterproofing and leak-proof treatment was carried out on the metal pipes and floor drains inside the prefabricated bathroom module units on the two adjacent floors.

4. The construction process for waterproofing joints in prefabricated modular building bathrooms according to claim 3, characterized in that, The method for sealing the metal pipes passing through the upper and lower bathroom module units includes the following steps: Before hoisting the upper and lower bathroom module units, steel sleeve A and rubber sleeve A are pre-embedded at corresponding positions on the bottom plate of the adjacent upper module and the top plate of the lower module, respectively. The inner diameter of the rubber sleeve A is the same as that of the steel sleeve A, and the upper end of the rubber sleeve A protrudes 20mm-30mm from the upper end of the steel sleeve A. During production, the upper edge opening of the rubber sleeve A is sealed with tape. Remove the sealing tape before installing the upper module; after hoisting the upper and lower modules, install the sanitary ware drain pipe or drain riser through the pre-embedded steel sleeve A and rubber sleeve A, and glue the lower drain pipe through the pre-embedded water-stop joint, and install the fire-resistant ring or decorative cover on the top of the lower module; there is a cast-in-place layer and a grout layer between the bottom plate of the upper module and the top plate of the lower module, and waterproof sealant is used to fill the gap between the steel sleeve A, rubber sleeve A and the drain pipe, and the surface of the bottom plate of the upper module has a bathroom waterproof layer.

5. The construction process for waterproofing joints in prefabricated modular building bathrooms according to claim 4, characterized in that, The waterproofing details for the prefabricated bathroom module unit are as follows: a water-stop joint is pre-embedded on the bottom slab of the upper module, and a rubber sleeve B and a steel sleeve B are pre-embedded at corresponding positions on the top slab of the lower module. The inner diameter of the steel sleeve B is equal to the outer diameter of the rubber sleeve B. After the upper and lower bathroom module units are hoisted, PVC drainage pipes are installed through the pre-embedded water-stop joint, steel sleeve B, and rubber sleeve B. Waterproof sealant is used to fill the gaps between the steel sleeve B, rubber sleeve B, and PVC pipes. Cement mortar is used to smooth the gap between the pre-embedded water-stop joint and the bottom slab of the upper module, and a single-component polyurethane waterproof coating is applied.

6. The construction process for waterproofing joints in prefabricated modular building bathrooms according to claim 5, characterized in that, The construction treatment at the joint between the window side and the wall includes the following steps: The walls of prefabricated bathroom module unit 1 should first undergo external waterproofing and thermal insulation treatment. JS-Ⅱ type polymer cement waterproof coating should be applied between the external waterproofing and insulation layers. The external wall finishing layer should not overlap the window frame by more than 5mm. When installing windows, the hot-dip galvanized steel subframe should be fixed to the joint between the window and the wall with rivets. The joint between the hot-dip galvanized steel subframe and the wall should be filled with waterproof mortar and polyurethane foam should be used for grouting. A layer of waterproof sealant should be applied to the surface, and the window frame should be fixed to the hot-dip galvanized steel subframe. The space between the window frame and the wall should be sealed with sealant.

7. The construction process for waterproofing joints in prefabricated modular building bathrooms according to claim 6, characterized in that, The construction treatment of the joint between the top of the window and the wall is the same as that of the joint between the side of the window and the wall.

8. The construction process for waterproofing joints in prefabricated modular building bathrooms according to claim 7, characterized in that, When hoisting prefabricated bathroom module units at the construction site, if the lower structure is a cast-in-place reinforced concrete slab, the prefabricated bathroom module unit should first be covered with grout according to the design requirements on the cast-in-place reinforced concrete slab to form module grout layer B. Then, the bathroom module unit is installed. At the corner where the wall and floor of the prefabricated bathroom module unit meet, the surface of the module wall has an inner waterproof layer, the bottom plate of the prefabricated bathroom module unit has a bathroom floor waterproof layer, the connection between the wall and the bottom plate is the corner of the bathroom unit, the inner waterproof layer has a decorative surface layer, and the surface of the bathroom floor waterproof layer has floor tiles.

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