A waterproof modular building box and modular building

Abstract

This utility model relates to a waterproof modular building box and a modular building. The modular building box includes a building box and a waterproof strip. The waterproof strip is fastened to the top of the decorative panel on the outer side of the top of the building box. By protecting the decorative panel with the waterproof strip, rainwater is prevented from seeping from the surface of the decorative panel into the gap between it and the top steel beam, thus ensuring the overall waterproof performance of the building structure. The modular building includes at least two of the above-mentioned modular building boxes stacked one on top of the other, with filling material placed in the joint between the two boxes. The two boxes are then connected using connecting components, ensuring the waterproof performance at the joint after the boxes are assembled on the construction site. The added waterproof strip not only ensures the temporary waterproof performance of the building box during transportation and storage, but also provides secondary waterproofing after the boxes are assembled and installed on the construction site. This not only improves the waterproof effect, but also reduces construction costs and is easy to operate.

Description

Technical Field

[0001] This utility model relates to the field of modular building technology, and in particular to a waterproof modular building box and a modular building. Background Technology

[0002] In current modular building assembly processes, no specific waterproofing measures or special processes are taken at the joints between the outer steel beams of the building box and the decorative panels. Rainwater can easily seep into the building box from these joints, damaging the decorative panels as well. In traditional construction, to address potential rainwater infiltration, contractors typically pack the finished steel boxes in standard bags after the building box finishing is completed. These bags serve as temporary protection to prevent rainwater leakage. However, the packaging materials are usually of low quality and easily damaged during handling or construction. Once the packaging materials are damaged, their waterproofing performance is significantly reduced, failing to effectively protect the building box from rainwater intrusion. Furthermore, this temporary measure cannot provide long-term protection. When multiple building boxes are installed, not only are individual boxes unprotected, but the joints between upper and lower boxes also suffer from poor sealing, making them prone to rainwater leakage. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a waterproof modular building box and modular building, which can effectively prevent rainwater from seeping from the surface of the decorative panel on the outer side of the top of the building box into the gap between it and the top steel beam, and can also effectively prevent rainwater from seeping into the joint between the upper and lower building boxes.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] In a first aspect, this utility model provides a waterproof modular building box, including a box body and a waterproof strip. The box body includes a top steel beam located on its top outer side and a first decorative panel located on the outer side of the top steel beam. The upper part of the first decorative panel forms a first L-shaped tongue and groove.

[0008] The waterproof strip has a U-shaped structure with opposing first and second sides, and the waterproof strip is fastened to the top of the first decorative panel, with its first side adjacent to the vertical edge of the first L-shaped tongue and groove.

[0009] Optionally, the first decorative panel includes a first fireproof board and a first aluminum plate adjacent to each other from the inside to the outside, the upper part of the first aluminum plate forming the first L-shaped tongue and groove, and the second side adjacent to the first fireproof board.

[0010] Optionally, the length of the second side is less than that of the first side, and the second side is inserted into the gap formed at the rounded corner of the first fireproof board and the top steel beam.

[0011] Optionally, it also includes a first sealant that fills the triangular gap formed at the rounded corner of the second side and the top steel beam.

[0012] Optionally, it also includes butyl tape, which extends from the top steel beam to the first side, and the upper surface of the first sealant, the waterproof strip, and the outer surface of the first side are all covered by butyl tape.

[0013] Alternatively, the waterproof strip is a metal waterproof strip with a galvanized coating on its surface.

[0014] Secondly, this utility model provides a modular building, including at least two waterproof modular building boxes as described in any one of the preceding claims stacked vertically, wherein there is a seam between the bottom surface of the upper modular building box and the top surface of the lower modular building box in two adjacent modular building boxes.

[0015] The modular building also includes a filling part and connecting components. The filling part is embedded in the joint, and the connecting components are straddling the outside of the joint. Both ends of the connecting components are fixedly connected to the body of the upper and lower modular building boxes, respectively.

[0016] Optionally, the enclosure body includes a bottom steel beam located on its outer bottom side, and a second decorative panel is provided on the outer side of the bottom steel beam. The lower part of the second decorative panel forms a second L-shaped tongue and groove. The second decorative panel includes a second fireproof plate and a second aluminum plate adjacent to each other from the inside to the outside, and the lower part of the second aluminum plate forms the second L-shaped tongue and groove.

[0017] The connecting components include a connecting plate and fasteners. The connecting plate is a cap-shaped structure with flanges at both the top and bottom. The flange at the top of the connecting plate overlaps the vertical edge of the second L-shaped tongue and groove of the upper modular building box, and the flange at the bottom overlaps the first side edge of the lower modular building box. The connecting plate is fixedly connected to the top steel beam and the bottom steel beam respectively by fasteners.

[0018] Optionally, the middle part of the connecting plate is flush with the outer surface of the first decorative panel and the outer surface of the second decorative panel. The flange at the lower end of the connecting plate and the first L-shaped tongue and groove of the modular building box below together form a first groove. The flange at the upper end of the connecting plate and the second L-shaped tongue and groove of the modular building box above together form a second groove. The first groove and the second groove are filled with a second sealant.

[0019] Optionally, the filling portion includes a layer of rock wool, a sealing rod, and fireproof sealant that fill the joint sequentially from the inside out.

[0020] (III) Beneficial Effects

[0021] The beneficial effects of this utility model are:

[0022] This utility model discloses a waterproof modular building box and modular building. On the one hand, by setting a waterproof strip on the decorative panel on the outer side of the top of the building box, the top of the decorative panel is protected, thereby preventing rainwater from seeping from the surface of the decorative panel into the gap between it and the top steel beam. This ensures the overall waterproof performance of the building structure, and also avoids rainwater damage to the decorative panel and separation between the decorative panel and the top steel beam due to rainwater flowing into the gap.

[0023] On the other hand, in modular buildings comprising at least two stacked modular building units, filling material is placed in the joint between the upper and lower units, and connecting components are installed on the outside of the joint to connect the two units, ensuring the waterproof performance at the joint after the units are assembled on site. Simultaneously, the waterproof strips added to the building units not only ensure temporary waterproofing during transportation and storage, but also provide secondary waterproofing after the units are assembled on site. This not only improves the waterproofing effect but also reduces construction costs and simplifies operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing the installation position of an embodiment 1 of the waterproof modular building box and modular building of this utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of a waterproof modular building box;

[0026] Figure 3 for Figure 1 A schematic diagram of a waterproof strip installed in a modular building box.

[0027] Figure 4 This is a schematic diagram showing the installation position of a waterproof modular building box and a modular building according to Embodiment 2 of this utility model;

[0028] Figure 5 for Figure 4 A schematic diagram of a modular building;

[0029] Figure 6 for Figure 4 An enlarged view of a modular building.

[0030] [Explanation of Labels in the Attached Image]

[0031] 1: Box body; 11: Top steel beam; 12: First decorative panel; 121: First fireproof board; 122: First aluminum plate; 13: Bottom steel beam; 14: Second decorative panel; 141: Second fireproof board; 142: Second aluminum plate;

[0032] 2: Waterproof strip; 21: First side edge; 22: Second side edge; 23: Horizontal edge;

[0033] 3: First sealant;

[0034] 4: Butyl tape;

[0035] 5: Filler section; 51: Rock wool layer; 52: Sealing rod; 53: Fireproof sealant;

[0036] 6: Connecting component; 61: Connecting plate; 62: Fastener;

[0037] 7: First groove;

[0038] 8: Second groove;

[0039] 9: Second sealant. Detailed Implementation

[0040] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper," "lower," "left," and "right" are used interchangeably. Figure 1 The orientation is used as a reference.

[0041] This utility model proposes a waterproof modular building box and modular building. Firstly, by installing a waterproof strip on the decorative panel on the outer top of the building box, it protects the top of the panel, preventing rainwater from seeping into the gap between the panel and the top steel beam. This ensures the overall waterproof performance of the building box and prevents rainwater from damaging the panel or causing separation between the panel and the top steel beam due to rainwater seeping into the gaps. Secondly, in a modular building comprising at least two stacked modular building boxes, filling material is placed in the joint between the upper and lower boxes, and connecting components are installed on the outside of the joint to connect the two boxes. This ensures the waterproof performance at the joint after the boxes are assembled on site, thereby guaranteeing the overall waterproof performance and structural integrity of the building structure. Furthermore, the waterproof strip added to the building box not only ensures temporary waterproof performance during transportation and storage but also provides secondary waterproofing after the boxes are assembled on site. This not only improves the waterproofing effect but also reduces construction costs and is convenient to operate.

[0042] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0043] Example 1:

[0044] Reference Figures 1 to 3 The waterproof modular building box shown in this embodiment includes a box body 1, a waterproof strip 2, a first sealant 3, and butyl tape 4.

[0045] The box body 1 is a prefabricated component that breaks down a building into independent modules. It is the core component of modular construction. During on-site construction, multiple prefabricated box bodies 1 are quickly assembled to form the entire modular building. The box body 1 includes a top steel beam 11, a first decorative panel 12, a bottom steel beam 13, and a second decorative panel 14. The top steel beam 11 and the bottom steel beam 13, together with other steel structural frames, form the main structure of the box body 1. The first decorative panel 12 and the second decorative panel 14 are the exterior decorative parts of the box body 1. The first decorative panel 12 is located on the outside of the top steel beam 11, and the second decorative panel 14 is located on the outside of the bottom steel beam 13. They not only serve a decorative purpose but also have multiple functions such as protection, waterproofing, sealing, and environmental protection.

[0046] The first decorative panel 12 includes a first fireproof board 121 and a first aluminum plate 122 that are adjacent to each other from the inside to the outside. The upper part of the first aluminum plate 122 has a first L-shaped tongue and groove. The vertical edge of the first L-shaped tongue and groove is set close to the first fireproof board 121, and it also forms the first L-shaped tongue and groove of the first decorative panel 12 as a whole.

[0047] The waterproof strip 2 is fastened to the top of the first decorative panel 12. It is a U-shaped structure including opposing first side 21 and second side 22 and a horizontal edge 23 connecting the first side 21 and the second side 22, as shown below. Figure 3As shown. The second side 22 is shorter than the first side 21. The first side 21 overlaps the vertical edge of the first L-shaped tongue and groove joint, and the second side 22 is inserted into the gap formed by the rounded corner of the first fireproof board 121 and the top steel beam 11. That is, the first side 21 is adjacent to the vertical edge of the first L-shaped tongue and groove joint, and the second side 22 is adjacent to the first fireproof board 121. The waterproof strip 2 is preferably a metal waterproof strip with a galvanized layer on its surface, which has excellent durability and can maintain its waterproof performance for a long time, reducing the risk of water leakage during the storage and transportation of the steel box. Of course, this utility model is not limited to this; those skilled in the art can select other metal materials or other waterproof materials according to actual needs. In this embodiment, the preferred dimensions of the waterproof strip 2 are: horizontal side 23 length 22mm, first side 21 length 30mm, second side 22 length 10mm, and thickness 0.5mm. Those skilled in the art can also adjust the dimensions according to engineering needs.

[0048] By adding a waterproof strip 2 at the top of the first decorative panel 12, the first decorative panel 12 is protected, thereby preventing rainwater from seeping from the upper surface of the first decorative panel 12 into the gap between it and the top steel beam 11. This also prevents rainwater from damaging the first decorative panel 12 or causing the first decorative panel 12 to separate from the top steel beam 11 due to rainwater flowing into the gap. This ensures the waterproof performance and structural integrity of the entire building box, and the construction cost is low and the operation is convenient.

[0049] To further enhance the waterproofing effect, the triangular gap formed by the second side 22 of the waterproof strip 2 and the rounded corner of the top steel beam 11 is filled with first sealant 3, and butyl tape 4 is adhered from the top steel beam 11 to the first side 21 of the waterproof strip 2. That is, after the waterproof strip 2 is installed, both the exposed surface of the waterproof strip 2 itself and the exposed surface of the first sealant 3 are covered under the butyl tape 4. In this embodiment, the first sealant 3 is preferably a weather-resistant sealant, which can better ensure the sealing effect and prevent moisture penetration.

[0050] Filling the triangular gap with the first sealant 3 can better form a protective barrier, ensuring a tight seal and preventing moisture penetration. It also helps to secure the waterproof strip 2. Applying butyl tape 4 further enhances the waterproof performance and protects the exposed surface of the waterproof strip 2, reducing the possibility of oxidation and corrosion under rainwater. It also helps to secure the waterproof strip 2.

[0051] The waterproof sealing structure shown in this embodiment effectively prevents moisture penetration, ensuring the dryness of the building's interior. Furthermore, the construction process is simple and easy for workers to master. This not only improves project progress but also effectively reduces construction costs. It offers significant economic, environmental, and social benefits in promoting the green and sustainable development of the construction industry. It not only improves the overall efficiency of the prefabricated building industry but also makes a positive contribution to environmental protection and resource conservation, enabling the prefabricated building industry to develop more healthily and sustainably.

[0052] The construction process of Example 1 is briefly described below:

[0053] Step 1: Install the first decorative panel 12, including the first fireproof board 121 and the first aluminum plate 122, at the end wall position of the box body 1 (i.e. the wall surface to which the top steel beam 11 belongs), ensuring that the first decorative panel 12 is flat and firmly fixed to the wall of the box body 1.

[0054] Step 2: The pre-made waterproof strip 2 is snapped onto the top of the first decorative panel 12. The first side 21 of the waterproof strip 2 overlaps the vertical edge of the first L-shaped tongue and groove of the first aluminum plate 122, and the second side 22 is inserted into the gap formed by the rounded corner of the first fireproof board 121 and the top steel beam 11, ensuring that there is no gap between the waterproof strip and the decorative panel.

[0055] Step 3: Fill the triangular gap formed by the second side 22 of the waterproof strip 2 and the rounded corner of the top steel beam 11 with the first sealant 3. The sealant should be applied fully in one go.

[0056] Step 4: Extend butyl tape 4 from the top steel beam 11 to the first side 21 of the waterproof strip 2, so that the exposed surface of the waterproof strip 2 itself and the triangular gap between the waterproof strip 2 and the top steel beam 11 (i.e. the exposed surface of the first sealant 3) are covered after installation.

[0057] Example 2:

[0058] Reference Figures 4 to 6 The modular building shown in this embodiment includes two waterproof modular building boxes as shown in Embodiment 1, as well as a filling part 5 and a connecting component 6. The modular building box shown in this embodiment includes all the technical features of Embodiment 1, which will not be repeated here.

[0059] In this embodiment, two modular building boxes are stacked one on top of the other. There is a seam between the bottom surface of the upper modular building box and the top surface of the lower modular building box. The filling part 5 is embedded in the seam, and the connecting component 6 is straddling the outside of the seam. Both ends of the connecting component 6 are fixedly connected to the box body 1 of the upper and lower modular building boxes, respectively.

[0060] The second decorative panel 14 includes a second fireproof board 141 and a second aluminum plate 142 that are adjacent to each other from the inside to the outside. The lower part of the second aluminum plate 142 has a second L-shaped tongue and groove. The vertical edge of the second L-shaped tongue and groove is closely attached to the second fireproof board 141, and it also forms the second L-shaped tongue and groove of the second decorative panel 14 as a whole.

[0061] The connecting component 6 includes a connecting plate 61 and fasteners 62. The connecting plate 61 is a cap-shaped structure with flanges at both the top and bottom. The upper flange of the connecting plate 61 overlaps the vertical edge of the second L-shaped tongue and groove, and the lower flange overlaps the first side edge 21. The connecting plate 61 is then fixedly connected to the top steel beam 11 and the bottom steel beam 13 by the fasteners 62, thereby achieving a fixed connection between the connecting plate 61 and the box body 1 of the upper and lower modular building boxes. When installing the fasteners 62, the fasteners 62 at the upper end of the connecting plate 61 pass through the connecting plate 61, the second decorative panel 14, and are fixedly connected to the bottom steel beam 13 in sequence; the fasteners 62 at the lower end of the connecting plate 61 pass through the connecting plate 61, the first side edge 21 of the waterproof strip 2, the first decorative panel 12, and are fixedly connected to the top steel beam 11 in sequence, ensuring a tight connection between the components and enhancing the stability and durability of the overall structure.

[0062] The middle portion of the connecting plate 61 is flush with the outer surfaces of the first decorative panel 12 and the second decorative panel 14. The flange at the lower end of the connecting plate 61 forms a first groove 7 together with the first L-shaped tongue and groove of the modular building box below. The flange at the upper end of the connecting plate 61 forms a second groove 8 together with the second L-shaped tongue and groove of the modular building box above. A second sealant 9 is filled into the first groove 7 and the second groove 8. Fasteners 62 installed at both ends of the connecting plate 61 are located inside the first groove 7 and the second groove 8, respectively. When the second sealant 9 is filled, the nail heads of the fasteners 62 are sealed by the second sealant 9. In this embodiment, the second sealant 9 is preferably a weather-resistant sealant, which can better ensure the sealing effect and prevent moisture penetration.

[0063] The filling part 5 includes a rock wool layer 51, a sealing rod 52, and a fireproof sealant 53 that are filled from the inside to the outside of the joint.

[0064] This embodiment aims to further ensure the waterproof sealing performance of the joints between the upper and lower modular building boxes during assembly. First, the gaps are filled and sealed using filler 5. Then, a connecting plate 61 is used on the outside of the joint to fix the box bodies 1 of the two modular building boxes together. The connecting plate 61 ensures that the first aluminum plate 122 and the second aluminum plate 142 fit tightly against the building box, and also protects other parts within the joint, directly blocking most of the rainwater to the outside, greatly reducing the amount of water in contact with the waterproof strip 2. The two work together to effectively improve the overall waterproof performance of the building. Simultaneously, the two grooves of the fasteners 62 on both sides of the connecting plate 61 are filled with second sealant 9, further preventing the risk of rainwater seeping in through the gaps in the fasteners 62. Furthermore, after installation, a flat and seamless sidewall is formed between the upper and lower modular building boxes and the connecting component 6, providing excellent drainage for rainwater, eliminating water accumulation space, and reducing the possibility of rainwater seeping into the building interior.

[0065] The construction process of Example 2 is briefly described below:

[0066] Step 1: Stack the two modular building boxes that have been installed using Example 1 on top of each other.

[0067] Step Two: Sequentially fill the joint between the two modular building boxes with rock wool layer 51, sealing rod 52, and fireproof sealant 53. When filling with fireproof sealant 53, ensure that it fully fills the joint between the upper and lower modular building boxes and the gap between the upper and lower modular building boxes and the sealing rod 52. At the same time, the fireproof sealant 53 should not extend beyond the end wall surface of the modular building box (i.e., the wall surface to which the outer side of the top steel beam 11 belongs).

[0068] Step 3: Install the connecting plate 61. At the tongue and groove position at the lower end of the second decorative panel 14, use fasteners 62 to pass through the connecting plate 61 and the second decorative panel 14 in sequence and fix them to the bottom steel beam 13. At the tongue and groove position at the upper end of the first decorative panel 12, use fasteners 62 to pass through the connecting plate 61, the waterproof strip 2, and the first decorative panel 12 in sequence and fix them to the top steel beam 11.

[0069] Step 4: Fill the nailing area with the second sealant 9, that is, fill the first groove 7 and the second groove 8 with the second sealant 9.

[0070] The modular building shown in this embodiment has good waterproof performance. Rainwater is not easy to seep into the joints between the upper and lower boxes. The waterproof strip 2 added to the modular building box not only ensures the temporary waterproof performance of the box body 1 during transportation and storage, but also achieves secondary waterproofing after the box is assembled and installed on the construction site. This not only improves the waterproof effect, but also reduces construction costs and makes the operation convenient.

[0071] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0072] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0073] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A waterproof modular building box, characterized in that, The box includes a box body (1) and a waterproof strip (2). The box body (1) includes a top steel beam (11) located on its top outer side and a first decorative panel (12) located on the outer side of the top steel beam (11). The upper part of the first decorative panel (12) forms a first L-shaped tongue and groove. The waterproof strip (2) is a U-shaped structure with opposite first side (21) and second side (22), and the waterproof strip (2) is fastened to the top of the first decorative panel (12), with the first side (21) adjacent to the vertical edge of the first L-shaped tongue and groove.

2. The waterproof modular building box according to claim 1, characterized in that: The first decorative panel (12) includes a first fireproof board (121) and a first aluminum plate (122) adjacent to each other from the inside to the outside, and the upper part of the first aluminum plate (122) forms the first L-shaped tongue and groove; The second side (22) is adjacent to the first fireproof board (121).

3. A waterproof modular building box according to claim 2, characterized in that: The length of the second side (22) is less than that of the first side (21), and the second side (22) is inserted into the gap formed by the first fireproof board (121) and the rounded corner of the top steel beam (11).

4. A waterproof modular building box according to claim 3, characterized in that: It also includes a first sealant (3), which fills the triangular gap formed at the rounded corner of the second side (22) and the top steel beam (11).

5. A waterproof modular building box according to claim 4, characterized in that: It also includes butyl tape (4), which extends from the top steel beam (11) and is attached to the first side (21); The first sealant (3), the upper surface of the waterproof strip (2), and the outer surface of the first side (21) are all covered by the butyl tape (4).

6. A waterproof modular building box according to any one of claims 1-5, characterized in that: The waterproof strip (2) is a metal waterproof strip with a zinc-plated layer on its surface.

7. A modular building, characterized in that, It includes at least two waterproof modular building boxes as described in any one of claims 1-6 stacked vertically, wherein there is a seam between the bottom surface of the upper modular building box and the top surface of the lower modular building box in two adjacent modular building boxes; The modular building also includes a filling section (5) and connecting components (6); The filling portion (5) is embedded in the seam; The connecting component (6) is mounted across the outside of the joint, and both ends of the connecting component (6) are fixedly connected to the body (1) of the upper and lower modular building boxes respectively.

8. A modular building according to claim 7, characterized in that: The box body (1) includes a bottom steel beam (13) located on its bottom outer side, and a second decorative panel (14) is provided on the outer side of the bottom steel beam (13), and the lower part of the second decorative panel (14) forms a second L-shaped tongue and groove. The second decorative panel (14) includes a second fireproof board (141) and a second aluminum plate (142) adjacent to each other from the inside to the outside, and the lower part of the second aluminum plate (142) forms the second L-shaped tongue and groove; The connecting assembly (6) includes a connecting plate (61) and a fastener (62); The connecting plate (61) is a hat-shaped structure with flanges at both the top and bottom. The flange on the upper side of the connecting plate (61) overlaps the vertical side of the second L-shaped tongue and groove of the upper modular building box, and the flange at the lower end overlaps the first side (21) of the lower modular building box. The connecting plate (61) is fixedly connected to the top steel beam (11) and the bottom steel beam (13) respectively by the fasteners (62).

9. A modular building according to claim 8, characterized in that: The middle part of the connecting plate (61) is flush with the outer surface of the first decorative panel (12) and the outer surface of the second decorative panel (14); The flange at the lower end of the connecting plate (61) and the first L-shaped tongue and groove of the modular building box below together form a first groove (7), and the flange at the upper end of the connecting plate (61) and the second L-shaped tongue and groove of the modular building box above together form a second groove (8). The first groove (7) and the second groove (8) are filled with a second sealant (9).

10. A modular building according to claim 7, characterized in that: The filling part (5) includes a rock wool layer (51), a sealing rod (52) and a fireproof sealant (53) that are filled from the inside to the outside of the joint.

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