ADU fabricated building

Abstract

The invention relates to an ADU fabricated building, the ADU fabricated building comprises a roof structure, a wall structure and an integral structure, the roof structure comprises a plurality of roof modules, the roof modules are spliced and connected, and a first cover plate is arranged at the splicing position; the wall structure connected with the roof structure comprises a plurality of outer wall modules and a plurality of inner wall modules, the outer wall modules and the inner wall modules are matched to construct a plurality of rooms, in the outer wall modules, the tops of the outer wall modules connected with the house outer frame are provided with connecting convex parts, and the bottoms of the outer wall modules connected with the embedded bases are provided with fixing parts. A connecting concave part and a connecting convex part are respectively formed at the splicing part and are connected through a second connecting piece; the integral structure at least comprises one of a kitchen and bath combination module, a kitchen single module and a toilet single module, and on-site quick assembly can be facilitated by pre-waterproofing. According to the ADU fabricated building, the designed modules are convenient to transport and have the advantages of being high in assembly speed, stable in assembly structure and the like.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and in particular to an ADU (Anatomical Design Unit) assembled building. Background Art

[0002] According to the definition of Senate Bill 1069, the latest law of the California government, ADU (Accessory Dwelling Unit) is a second residential unit with necessary living facilities that can be legally added to one's own land, or it is called supporting housing. It can be a basement, a suite for a spouse's family, or an apartment converted from a garage. In layman's terms, ADU is an additional living space independent of the original residential unit. Currently, these small, highly customized houses are emerging in backyards across the United States.

[0003] When domestic manufacturers undertake the construction of ADU buildings, they usually prefabricate them domestically and then transport them to the destination for assembly. Transportation convenience, assembly speed, and assembly structure stability are all important factors that manufacturers need to consider. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, the present invention provides an ADU prefabricated building, wherein each module designed by the present invention is not only easy to transport, but also has the advantages of fast assembly speed and stable assembly structure.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] An ADU prefabricated building, comprising:

[0007] A roof structure, wherein the roof structure comprises a plurality of roof modules spliced ​​together, each roof module comprising a top surface frame arranged in a herringbone shape, and an outer frame and an inner frame fixed to the bottom thereof, the top surface frame being filled with polyurethane foam, the top surface frame being provided with a thermal insulation layer, a support layer, a waterproof layer and a top plate layer in sequence, a splicing piece being provided at the top of the splicing side of the top surface frame, the splicing pieces of adjacent roof modules being fixedly connected by a first connecting piece, a first cover plate being provided on the top plate layer where the splicing of adjacent roof modules is located, so as to cover the splicing piece and the first connecting piece and connect the top plates of adjacent roof modules, and a first connecting portion being formed at the bottom middle portion of the outer frame;

[0008] A wall structure connected to the roof structure, the wall structure comprising a plurality of exterior wall modules and a plurality of interior wall modules, the two being able to cooperate to construct a plurality of rooms, wherein the top of the exterior wall module connected to the exterior frame of the room is provided with a second connection portion, and the bottom of the exterior wall module connected to the embedded seat is provided with a fixing portion, and in two adjacent spliced ​​exterior wall modules, a first connection portion and a second connection portion are also formed at the splicing position, respectively, of which one is a connection recess and the other is a connection protrusion, and the connection protrusion can be fixed in the connection recess by a second connection member;

[0009] The integrated structure includes at least one of a kitchen and bathroom combined module, a kitchen single module, and a bathroom single module. The outer wall and inner wall of the integrated structure are respectively the same as the outer wall module and the inner wall module of the wall structure, so that it can be assembled in an ADU prefabricated building.

[0010] Preferably, a floor structure is also included to construct a multi-story space, wherein the floor structure is composed of a plurality of floor modules, and the floor modules are fixedly connected to corresponding exterior wall modules and / or interior wall modules to form a plurality of fixed assembly modules.

[0011] Preferably, the exterior wall module includes a first main frame, the first main frame is filled with polyurethane foam, the inside and outside of the first main frame are respectively provided with inner wall panels and outer wall panels, the first main frame includes an inner frame and an outer frame, and the inner frame and the outer frame are respectively connected with fixed beams at the edges around the edges. In two adjacent spliced ​​wall modules, the fixed beam on the splicing side of one wall module protrudes from the edges of the inner frame and the outer frame to form a connecting convex portion, and the fixed beam on the splicing side of the other wall module is recessed into the edges of the inner frame and the outer frame to form a connecting concave portion.

[0012] Preferably, the polyurethane foam material is protruded from the first main frame to a certain thickness, and buckling parts are formed around the outer wall board so as to be buckled on the protruding polyurethane foam material;

[0013] In the two adjacent exterior wall modules spliced ​​together, a splicing seam is left between adjacent exterior frames, a first L-shaped splicing portion is formed in the splicing seam of the upper exterior wall panel, a second L-shaped splicing portion is formed in the splicing seam of the lower exterior wall panel, and the first L-shaped splicing portion is buckled outside the second L-shaped splicing portion.

[0014] Preferably, the interior wall module includes a second main frame, which is filled with polyurethane foam. Interior wall panels are also provided on both sides of the second main frame. The second main frame forms a plane splicing portion or a third L-shaped splicing portion at the splicing end. In adjacent spliced ​​interior wall modules, the two spliced ​​third L-shaped splicing portions can be matched and aligned.

[0015] Preferably, the two inclined surfaces of the top surface frame are respectively provided with a thermal insulation layer, a support layer, a waterproof layer and a top plate layer, the inclined upper ends of the top plate layer and the first cover plate are inserted into the opening of a U-shaped plate, and the two U-shaped plates of the two inclined surfaces are connected with a second cover plate;

[0016] The thermal insulation layer on the two inclined surfaces is integrally arranged, or / and the waterproof layer on the two inclined surfaces is integrally arranged.

[0017] Preferably, a positioning beam is connected to the top middle part of the top surface frame, and the positioning beam is a rectangular steel pipe connected to the top surface frame or two back-connected second angle steels, two U-shaped plates are abutted against both sides of the positioning beam, and the second cover plate covers the positioning beam.

[0018] Preferably, the thermal insulation layer is made of thermal insulation cotton, the supporting layer is made of OSB board, the waterproof layer is made of SBS self-adhesive waterproof membrane, the top plate layer is formed by a plurality of top plates sequentially buckled together, and the top plate is made of aluminum-magnesium-manganese plate.

[0019] Preferably, the top plate layer is formed by multiple top plates that are sequentially buckled, one side of the top plate is sequentially bent upward and inward to form an inverted L-shaped buckling portion, the other side of the top plate is sequentially bent upward, outward, inward and downward to form a buckle interface that can cooperate with the L-shaped buckle portion, and the top plate is fixed to the support layer by a third connecting piece that cooperates with the inverted L-shaped buckle portion.

[0020] Preferably, the multi-section roof module is divided into a middle roof module and a side roof module, the middle roof module is provided with an external frame at the front and rear sides of its bottom, and the side roof module is provided with an external frame at the front, rear and outer sides of its bottom.

[0021] Preferably, the splicing piece is a first angle steel, and the first connecting piece can be a bolt and nut matching structure.

[0022] Preferably, the inner wall panels are made of fiber cement boards, and the outer wall panels can be made of aluminum boards.

[0023] Preferably, the exterior wall of the self-contained structure is the same as one of the exterior wall module structures of the wall structure, and the interior wall of the self-contained structure is the same as one of the interior wall modules of the wall structure, so as to facilitate the assembly of the self-contained structure in the ADU prefabricated building.

[0024] The present invention adopts the above structure, and has the advantages of:

[0025] 1. The ADU prefabricated building adopts multi-module splicing for the roof structure and wall structure, and the kitchen and bathroom adopt the integrated structure design, so that complex lines, pipelines or electrical appliances can be integrated and assembled in the factory, which is not only convenient for container transportation, but also eliminates the need for on-site installation, greatly improving the speed of on-site assembly; scientific mortise and tenon splicing is adopted between the structures and the modules therein, which is not only convenient and quick to assemble, but also has a firm connection.

[0026] Specifically, the roof structure is designed with multiple roof modules, which is not only convenient for transportation, but also convenient for quick assembly on site to form a stable roof structure; the wall structure is designed with multiple exterior wall modules and multiple interior wall modules, which is also convenient for transportation, and convenient for quick construction of a stable wall structure on site, and convenient for quick assembly with the roof structure; the kitchen and bathroom are designed as complete structures, and waterproof design can be done in advance, so that there is no need for waterproof processing on site, which greatly saves on-site assembly time.

[0027] In summary, the modules designed for this ADU prefabricated building have the advantages of convenient transportation, fast construction speed and stable construction structure.

[0028] 2. In the exterior wall module, the first main frame constructed by the inner frame, the outer frame and the fixed beam has the following advantages: First, the double-broken bridge structure and the polyurethane foam filling can greatly improve the energy-saving, heat-insulating and sound-insulating properties of the wall; second, the structure is relatively strong; third, the connection concave and convex parts are used to facilitate quick assembly, and the assembled structure is also relatively strong; fourth, the weight is kept as light as possible on the basis of a strong structure, making it easier to transport and assemble.

[0029] 3. In the roof structure, the two roof modules can be quickly spliced ​​together by the splicing piece and the first connecting piece. The first cover plate can be set to better cover the above structure to prevent water leakage. The two U-shaped plates and the second cover plate can better cover the gap in the middle of the roof left by the functional layers being set on the inclined surface. The above structure is not only convenient for quickly assembling the roof structure, but also has the functions of being firm, waterproof, and having good thermal insulation effects.

[0030] The top plate layer can finally be fixed and spliced ​​by a third connecting piece. Compared with the traditional structure that requires pre-fixed buckled fixings, this structure of the present application is more conducive to the laying of the layers below.

[0031] 4. Polyurethane foam is used in the roof structure, wall structure and overall structure, which makes it have multiple functions such as thermal insulation, heat insulation, sound insulation, earthquake resistance and light weight.

[0032] 5. Connecting the floor module with part of the exterior wall module or interior wall module to form a fixed assembly module is not only convenient for transportation, but also convenient for quick assembly with other interior wall modules or exterior wall modules on site, and the connection is also firm after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A simplified structural diagram of one embodiment of the present invention;

[0034] Figure 2 for Figure 1 A side sectional view of

[0035] Figure 3 for Figure 2 Disassembly diagram of each module;

[0036] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0037] Figure 5 A structural diagram showing the coordination of the top surface frame, the exterior frame and the interior frame in the roof module;

[0038] Figure 6 for Figure 3 Axonometric view of part of the roof module;

[0039] Figure 7 This is a partial structural diagram of the joint of adjacent roof modules;

[0040] Figure 8 for Figure 3 Schematic diagram of the enlarged structure of part F;

[0041] Fig. 9 for Figure 6 Schematic diagram of the enlarged structure of the G part;

[0042] Fig.10 A structural schematic diagram of the first main frame in the wall module;

[0043] Fig.11 for Figure 2 A schematic diagram of the enlarged structure of the middle part A;

[0044] Fig.12 for Fig.11 Schematic diagram of the explosion structure of each exterior wall module;

[0045] Fig.13 for Figure 2 The enlarged structural diagram of the middle B part;

[0046] Fig.14 It is a schematic diagram of a partial top view of the structure of the horizontal splicing of the exterior wall modules;

[0047] Fig.15 for Figure 2 The enlarged structural diagram of the middle D part;

[0048] Fig.16 for Figure 4 Disassembly diagram of each module.

[0049] In the figure, a, roof structure, b, wall structure, c, integrated structure, d, floor structure, e, embedded seat;

[0050] a1, roof module, a2, first connecting member, a3, first cover plate,

[0051] a11, top surface frame, a12, exterior frame, a13, interior frame, a14, polyurethane foam material, a15, thermal insulation layer, a16, support layer, a17, waterproof layer, a18, top plate layer, a19, splicing piece, a20, U-shaped plate, a21, second cover plate, a22, positioning beam;

[0052] a181, top plate, a182, third connecting member;

[0053] a1811, inverted L-shaped buckle connection portion, a1812, buckle interface;

[0054] b1, external wall module, b2, internal wall module, b3, second connecting piece;

[0055] b11, first main frame, b12, inner wall panels, b13, outer wall panels, b14, I-shaped panels, b21, second main frame;

[0056] b111, inner frame, b112, outer frame, b113, fixed beam, b114, fixed portion, b115, connecting recess, b116, connecting protrusion, b131, buckling portion, b132, first L-shaped splicing portion, b133, second L-shaped splicing portion, b211, plane splicing portion, b212, third L-shaped splicing portion. DETAILED DESCRIPTION

[0057] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. In the description of this specification, the description of reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0058] like Figure 1-16 As shown, in this embodiment, the ADU prefabricated building includes a roof structure a, a wall structure b and a prefabricated structure c, wherein:

[0059] Regarding the roof structure a, Figure 4 As shown, it includes a plurality of spliced ​​roof modules a1; Figure 5 As shown, each section of the roof module includes a top frame a11 arranged in a herringbone shape, and an outer frame a12 and an inner frame a13 fixed to the bottom thereof; Figure 6 As shown, the top surface frame a11 is filled with polyurethane foam material a14, and the top surface frame a11 is provided with a heat insulation layer a15, a support layer a16, a waterproof layer a17 and a top plate layer a18 in sequence; Figure 5 and 7 As shown, a splicing piece a19 is provided on the top of the splicing side of the top surface frame a11, and a first angle steel can be used for the splicing piece. The splicing pieces a19 of adjacent roof modules are fixedly connected by a first connecting piece a2, and a bolt and nut matching structure can be used for the first connecting piece a2. A first cover plate a3 is provided on the top plate layer a18 of the splicing of adjacent roof modules a1 to cover the splicing piece a19 and the first connecting piece a2 and connect the top plate layer a18 of adjacent roof modules; as shown Figure 5 As shown, a first connecting portion is formed at the bottom middle portion of the exterior frame a12 to facilitate connection with the wall structure b below.

[0060] In a specific example, Figure 4 As shown, when the ADU prefabricated building is constructed independently, the multi-section roof modules are divided into a middle roof module and a side roof module. The middle roof module is provided with an external frame at the front and rear sides of its bottom, and the side roof module is provided with an external frame at the front, rear and outer sides of its bottom to adaptably cooperate with the wall structure b below for assembly.

[0061] In a specific example, Figure 8 As shown, the two inclined surfaces of the top surface frame a11 are respectively provided with a thermal insulation layer a15, a supporting layer a16, a waterproof layer a17 and a top plate layer a18, the inclined upper ends of the top plate layer a18 and the first cover plate a3 are inserted into the opening of a U-shaped plate a20, and the two U-shaped plates a20 of the two inclined surfaces are connected with a second cover plate a21. In order to better keep warm, the thermal insulation layers a15 on the two inclined surfaces can be integrated; and in order to improve the waterproof effect, the waterproof layers a17 on the two inclined surfaces can also be integrated.

[0062] In a specific example, Figure 5Or as shown in Figure 8, in order to further increase the firmness of the roof module, the following settings can be made. Specifically, a positioning beam a22 is connected to the top middle part of the top surface frame a11. The positioning beam a22 is a rectangular steel pipe connected to the top surface frame a11 or two back-connected second angle steels. Two U-shaped plates a20 are abutted against both sides of the positioning beam a22, and the second cover plate a21 is set to cover the positioning beam a22.

[0063] In a specific example, the thermal insulation layer a15 can be made of thermal insulation cotton, the support layer a16 can be made of OSB board, the waterproof layer a17 can be made of SBS self-adhesive waterproof membrane, and the top plate layer a18 is formed by a plurality of top plates a181 connected in sequence, and the top plate can be made of aluminum-magnesium-manganese plate. The thickness of each functional layer is set according to the actual needs of the construction site. Regarding the structure of the top plate a181, the following structure can be specifically adopted: Figure 5 and 9 As shown, one side of the top plate a181 is bent upward and inward in sequence to form an inverted L-shaped buckling portion a1811, and the other side of the top plate a181 is bent upward, outward, inward and downward in sequence to form a buckle interface a1812 that can cooperate with the L-shaped buckle portion, and the top plate a181 is fixed to the support layer by a third connecting member a182 that cooperates with the inverted L-shaped buckle portion a1811.

[0064] In a specific example, the frame outside the room is also filled with polyurethane foam a14, and an exterior wall panel is provided on the outside. The structure of the frame outside the room is similar to the first main frame of the wall structure.

[0065] Regarding the wall structure b, it is connected to the roof structure a, such as Figure 2-4 As shown, the wall structure b includes a plurality of exterior wall modules b1 and a plurality of interior wall modules b2, which can be used to construct a plurality of rooms. Among the plurality of exterior wall modules b1, the top of the exterior wall module connected to the room outer frame a12 is provided with a second connecting portion, and the bottom of the exterior wall module connected to the embedded seat d is provided with a fixing portion b114. The embedded seat e is a pre-embedded structure in advance at the construction site, such as Figure 11-12 As shown in Figure 14, in two adjacent spliced ​​exterior wall modules b1, a first connection portion and a second connection portion are also formed at the splicing portion, one of which is a connecting recess b115 and the other is a connecting protrusion b116, and the connecting protrusion can be fixed in the connecting recess by a second connecting member b3 to realize vertical and horizontal splicing of the exterior wall modules and vertical and horizontal splicing of the interior wall modules.

[0066] In a specific example, Figure 10-13As shown, the exterior wall module b1 specifically includes a first main frame b11, the first main frame b11 is filled with polyurethane foam a11, the inside and outside of the first main frame b11 are respectively provided with inner wall panels b12 and outer wall panels b13, the first main frame b11 includes an inner frame b111 and an outer frame b112, and the inner frame b111 and the outer frame b112 are respectively connected with fixed beams b113 at the edges around them, and the fixed beams can be fixed to the two by screws. In two adjacent spliced ​​wall modules, the fixed beam b113 on the splicing side of one wall module protrudes from the edges of the inner frame b111 and the outer frame b112 to form a connecting convex portion, and the fixed beam b113 on the splicing side of the other wall module is recessed into the edges of the inner frame b111 and the outer frame b112 to form a connecting concave portion.

[0067] In a specific example, Figure 11-14 As shown, the polyurethane foam a11 is protruded from the first main frame b11 to a certain thickness, and buckling parts b131 are formed on all four sides of the exterior wall panel b13 to buckle it on the protruding polyurethane foam a11; in the two exterior wall modules b1 adjacent to each other upper and lower, a splicing seam is left between adjacent exterior frames b112, and the upper exterior wall panel b13 has a first L-shaped splicing part b132 formed in the splicing seam, and the lower exterior wall panel has a second L-shaped splicing part b133 formed in the splicing seam, and the first L-shaped splicing part is buckled outside the second L-shaped splicing part.

[0068] In a specific example, Fig.15 As shown, the interior wall module b2 includes a second main frame b21, which is filled with polyurethane foam. Inner wall panels b12 are also provided on both sides of the second main frame b21. The second main frame b21 forms a planar splicing portion b211 or a third L-shaped splicing portion b212 at the splicing end. In adjacent spliced ​​interior wall modules, the two spliced ​​third L-shaped splicing portions can be matched and aligned.

[0069] In a specific example, Fig.14 As shown, the inner wall panel b12 is positioned by an I-shaped plate b14 fixed to the first main frame or the second main frame.

[0070] In a specific example, the inner wall panel b12 is made of fiber cement board, the outer wall panel b13 is made of aluminum plate, and the first connecting member is made of stainless steel screws. The first main frame and the second main frame are fixed by a plurality of zinc-aluminum-magnesium steel pipes.

[0071] In a specific example, Figure 2As shown, in the exterior wall module located at the bottom, the bottom of the outer frame is higher than the inner fixed beams and the inner frame setting, so as to form an installation opening for fixing the embedded base below the outer frame; or the bottom of the inner frame is higher than the outer fixed beams and the outer frame setting, so as to form an installation opening for fixing the embedded base below the inner frame.

[0072] Regarding the monolithic structure c, Figure 3 As shown, it includes at least one of a kitchen and bathroom combined module, a kitchen single module, and a bathroom single module; Fig.11 As shown, the exterior wall and interior wall of the self-contained structure are respectively identical to the exterior wall module and interior wall module of the wall structure, so that it can be assembled in an ADU prefabricated building.

[0073] In one example, the ADU prefabricated building also includes a floor structure d to construct a multi-story space. Of course, in order to facilitate going up and down the stairs, a staircase structure needs to be adaptively set. The floor structure d is composed of multiple floor modules, and the floor modules are fixedly connected with corresponding exterior wall modules and / or interior wall modules to form a variety of fixed assembly modules. Specifically, Figure 3 and 16 shown.

[0074] In particular, regarding the ADU prefabricated building, in actual application, sunshade and rainproof structures can be set at the entrance and exit as needed, and smoke ducts and other structures can be set on the roof, such as Figure 1 During on-site installation, floors, tiles, skirtings and other structures will be laid in the room as needed.

[0075] The above specific implementations cannot be used as limitations on the scope of protection of the present invention. For those skilled in the art, any replacement, improvement or change made to the implementations of the present invention falls within the scope of protection of the present invention. The parts not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. An ADU prefabricated building, characterized in that: include: A roof structure, comprising a plurality of roof modules spliced ​​together, each of which comprises a top frame arranged in a herringbone shape, and an outer frame and an inner frame fixed to the bottom thereof, the top frame being filled with polyurethane foam, the top frame being provided with a thermal insulation layer, a support layer, a waterproof layer and a top plate layer in sequence, a splicing piece being provided at the top of the splicing side of the top frame, the splicing pieces of adjacent roof modules being fixedly connected by a first connecting piece, a first cover plate being provided on the top plate layer where the splicing of adjacent roof modules is located, so as to cover the splicing piece and the first connecting piece and connect the top plates of adjacent roof modules, and a first connecting portion being formed at the bottom middle of the outer frame; A wall structure connected to the roof structure, the wall structure comprising a plurality of exterior wall modules and a plurality of interior wall modules, the two being able to cooperate to construct a plurality of rooms, wherein the top of the exterior wall module connected to the exterior frame of the room is provided with a second connection portion, and the bottom of the exterior wall module connected to the embedded seat is provided with a fixing portion, and in two adjacent spliced ​​exterior wall modules, a first connection portion and a second connection portion are also formed at the splicing position, respectively, of which one is a connection recess and the other is a connection protrusion, and the connection protrusion can be fixed in the connection recess by a second connection member; The integrated structure includes at least one of a kitchen and bathroom combined module, a kitchen single module, and a bathroom single module. The outer wall and inner wall of the integrated structure are respectively the same as the outer wall module and the inner wall module of the wall structure, so that it can be assembled in an ADU prefabricated building.

2. The ADU prefabricated building according to claim 1, characterized in that: It also includes a floor structure to construct a multi-story space, wherein the floor structure is composed of a plurality of floor modules, and the floor modules are fixedly connected with corresponding exterior wall modules and / or interior wall modules to form a plurality of fixed assembly modules.

3. The ADU prefabricated building according to claim 1 or 2, characterized in that: The exterior wall module includes a first main frame, which is filled with polyurethane foam. The first main frame is provided with inner wall panels and outer wall panels inside and outside respectively. The first main frame includes an inner frame and an outer frame. Fixed beams are connected between the inner frame and the outer frame at the four edges. In two adjacent spliced ​​wall modules, the fixed beams on the splicing side of one wall module protrude from the edges of the inner frame and the outer frame to form a connecting convex portion, and the fixed beams on the splicing side of the other wall module are recessed into the edges of the inner frame and the outer frame to form a connecting concave portion.

4. The ADU prefabricated building according to claim 3, characterized in that: The polyurethane foam material is protruded from the first main frame to a certain thickness, and buckling parts are formed around the outer wall board to buckle on the protruding polyurethane foam material; In the two adjacent exterior wall modules spliced ​​together, a splicing seam is left between adjacent exterior frames, a first L-shaped splicing portion is formed in the splicing seam of the upper exterior wall panel, a second L-shaped splicing portion is formed in the splicing seam of the lower exterior wall panel, and the first L-shaped splicing portion is buckled outside the second L-shaped splicing portion.

5. The ADU prefabricated building according to claim 1 or 2, characterized in that: The interior wall module includes a second main frame, which is filled with polyurethane foam. Inner wall panels are also provided on both sides of the second main frame. The second main frame forms a flat splicing part or a third L-shaped splicing part at the splicing end. In adjacent spliced ​​interior wall modules, the two spliced ​​third L-shaped splicing parts can be matched and aligned.

6. The ADU prefabricated building according to claim 1, characterized in that: The two inclined surfaces of the top surface frame are respectively provided with a thermal insulation layer, a support layer, a waterproof layer and a top plate layer, the inclined upper ends of the top plate layer and the first cover plate are inserted into the opening of a U-shaped plate, and the two U-shaped plates of the two inclined surfaces are connected with a second cover plate; The thermal insulation layer on the two inclined surfaces is integrally arranged, or / and the waterproof layer on the two inclined surfaces is integrally arranged.

7. The ADU prefabricated building according to claim 6, characterized in that: A positioning beam is connected to the top middle of the top surface frame. The positioning beam is a rectangular steel pipe connected to the top surface frame or two back-connected second angle steels. Two U-shaped plates are abutted against both sides of the positioning beam, and the second cover plate covers the positioning beam.

8. The ADU prefabricated building according to claim 1, characterized in that: The thermal insulation layer is made of thermal insulation cotton, the supporting layer is made of OSB board, the waterproof layer is made of SBS self-adhesive waterproof membrane, the top plate layer is made of a plurality of top plates buckled in sequence, and the top plate is made of aluminum-magnesium-manganese plate.

9. The ADU prefabricated building according to claim 1 or 8, characterized in that: The top plate layer is formed by multiple top plates that are buckled in sequence, one side of the top plate is bent upward and inward in sequence to form an inverted L-shaped buckling portion, and the other side of the top plate is bent upward, outward, inward and downward in sequence to form a buckle interface that can cooperate with the L-shaped buckle portion, and the top plate is fixed to the support layer by a third connecting piece that cooperates with the inverted L-shaped buckle portion.

10. The ADU prefabricated building according to claim 1, characterized in that: The multi-section roof module is divided into a middle roof module and a side roof module. The middle roof module is provided with an external frame at the front and rear sides of its bottom, and the side roof module is provided with an external frame at the front, rear and outer sides of its bottom.

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