A connection structure and construction method of modular building

Abstract

The present application relates to a connection structure and construction method of a modular building, and relates to the field of modular building technology. It includes a plurality of inner templates, a plurality of outer templates, and connecting steel bars arranged between the inner templates and the outer templates. An inner template and an outer template are arranged opposite to each other, and both ends of the connecting steel bars are provided with straight and bent sections, and also includes an installation mechanism; the installation mechanism includes a first installation component and a second installation component; the first installation component includes a fixed block, a slider, a first installation block, and a first spring; the fixed block is fixedly connected to the side of the outer template close to the inner template, the fixed block is sleeved on the slider and slidably connected to the slider, the first installation block is arranged in the inner cavity of the slider, and a plug-in hole is opened on the first installation block, a connecting hole is opened on the slider, the plug-in hole is connected to the connecting hole, and the first spring is arranged in the inner cavity of the fixed block; the second installation component is arranged on the side of the inner template close to the outer template. The present application has the effect of improving the installation efficiency of the connecting steel bars.

Description

Technical Field

[0001] The present application relates to the technical field of modular buildings, and in particular to a connection structure and a construction method of a modular building. Background Art

[0002] Modular construction is an emerging building structure system that takes each room as a modular unit, which is prefabricated in the factory, transported to the site and assembled into a whole building through reliable connections. In addition, the foam module house and the free formwork house that have become popular in recent years are also types of modular construction.

[0003] In the related art, the connection structure of a modular building includes an inner formwork, an outer formwork and connecting steel bars arranged between the inner formwork and the outer formwork. The inner formwork and the outer formwork are arranged opposite to each other, and the inner formwork and the outer formwork together form a cavity for pouring concrete. The inner formwork and the outer formwork are fixedly connected to a mounting seat for installing the connecting steel bars on one side close to each other. The two mounting seats are fixed at a distance. Straight and bent sections are provided at both ends of the connecting steel bars, one of the straight and bent sections is plugged into the mounting seat of the inner formwork, and the other straight and bent section is plugged into the mounting seat of the outer formwork. The mounting seat is provided with plug-in holes for plugging in the straight and bent sections, and two adjacent inner formworks are clamped together, and two adjacent outer formworks are clamped together.

[0004] During construction, the workers first clamp the two adjacent inner formworks, and then clamp the two adjacent outer formworks until a layer of wall is formed. Then, the opposite inner and outer formworks are connected by connecting steel bars, so that one straight and bent section of the connecting steel bar is inserted into the mounting seat of the inner formwork, and the other straight and bent section is inserted into the mounting seat of the outer formwork, until the connecting steel bars of one layer of the wall are installed. Then, concrete is poured into the cavity of the inner and outer formworks. After the concrete is poured, it is vibrated and then the above steps are repeated to form another layer of the wall until the entire wall structure is formed.

[0005] Regarding the above-mentioned related technologies, during actual construction, due to the deviation in the length of each connecting steel bar, when the two straight and bent sections of the connecting steel bar are respectively inserted into the two insertion holes, there is a possibility that the distance between the two straight and bent sections is slightly larger than the distance between the two insertion holes. At this time, the staff needs to use tools to adjust one of the straight and bent sections, resulting in low installation efficiency of the connecting steel bars. Summary of the invention

[0006] In order to improve the installation efficiency of connecting steel bars, the present application provides a connection structure and a construction method for a modular building.

[0007] In the first aspect, the present application provides a modular building connection structure that adopts the following technical solution:

[0008] A connection structure of a modular building, comprising a plurality of inner formworks, a plurality of outer formworks and connecting steel bars arranged between the inner formworks and the outer formworks, wherein an inner formwork and an outer formwork are arranged opposite to each other, the inner formworks and the outer formworks together form a cavity for pouring concrete, straight and bent sections are arranged at both ends of the connecting steel bars, two adjacent inner formworks are clamped together, and two adjacent outer formworks are clamped together, and also comprises an installation mechanism for installing the connecting steel bars;

[0009] The mounting mechanism includes a first mounting component and a second mounting component;

[0010] The first mounting assembly includes a fixed block, a sliding block, a first mounting block, and a first spring for pushing the sliding block to move toward the inner template;

[0011] The fixing block is fixed to a side of the outer template close to the inner template, the fixing block is sleeved on the slider and is slidably connected to the slider, the sliding direction is the perpendicular direction of the plane where the outer template is located, the first mounting block is arranged in the inner cavity of the slider, and the first mounting block is provided with a plug-in hole for the straight and bent section to be plugged in, the slider is provided with a connecting hole for the straight and bent section to pass through, the plug-in hole is communicated with the connecting hole, and the first spring is arranged in the inner cavity of the fixing block;

[0012] The second mounting assembly is arranged on a side of the inner template close to the outer template.

[0013] By adopting the above technical scheme, two adjacent inner templates are clamped together, and then two adjacent outer templates are clamped together until a layer of wall is formed, and then the connecting steel bars are installed. When installing the connecting steel bars, first a straight and bent section of the connecting steel bar is passed through the connecting hole and inserted into the plug-in hole, and then the other straight and bent section is installed on the second installation component. When the spacing between the two straight and bent sections is slightly larger than the spacing between the plug-in hole and the connection point on the second installation component, the staff applies force to the connecting steel bar, and the straight and bent section drives the first installation block to move toward the outer template, and the first installation block drives the slider to slide, and the slider compresses the first spring in the inner cavity of the fixed block, thereby increasing the spacing between the connection hole and the connection point on the second installation component until the straight and bent section can be installed with the second installation component. There is no need for the staff to use tools to adjust the straight and bent section, which improves the installation efficiency of the connecting steel bars, reduces the labor intensity of the staff, and saves time and effort. After the connecting steel bars are installed, the reaction force of the first spring pushes the slider to move away from the outer template, which is convenient for improving the stability of the connecting structure.

[0014] Optionally, a flaring boss is fixedly connected to a side of the sliding block close to the outer template, and a closing retaining ring for abutting the flaring boss is fixedly connected to a side of the fixing block away from the outer template.

[0015] By adopting the above technical solution, the designed flaring boss and closing retaining ring can prevent the sliding block from separating from the fixing block.

[0016] Optionally, the first mounting block is slidably connected to the slider, and a second spring is provided in the inner cavity of the slider for pushing the first mounting block to move toward the outer template, and the connection hole is waist-shaped.

[0017] By adopting the above technical solution, during the installation of the connecting steel bars, when the distance between the two straight and bent sections is slightly smaller than the distance between the plug-in hole and the connection point on the second mounting assembly, the staff applies force to the connecting steel bars, and the straight and bent section drives the first mounting block to move toward the inner template. The first mounting block compresses the second spring, thereby reducing the distance between the connecting hole and the connection point on the second mounting assembly until the straight and bent section can be installed with the second mounting assembly. There is no need for the staff to use tools to adjust the straight and bent section, thereby further improving the installation efficiency of the connecting steel bars.

[0018] Optionally, the second mounting assembly includes a second mounting block, the second mounting block is fixedly connected to a side of the inner template close to the outer template, and the second mounting block is provided with a penetration hole for the straight and bent sections to penetrate.

[0019] By adopting the above technical solution, the second mounting block is designed to be inserted into the insertion hole through the straight and bent sections. Since the second mounting block is fixed, it is convenient to fix the position of the connecting steel bars.

[0020] Optionally, the top wall of the inner template is fixedly connected with a first card flute, the bottom wall of the inner template is provided with a first card slot, and the first card flute of one inner template is card-connected to the first card slot of the bottom wall of another inner template;

[0021] A second card rib is fixedly connected to one side of the inner template, and a second card slot is opened on the other side of the inner template. The second card rib of one inner template is card-connected to the second card slot of another inner template.

[0022] By adopting the above technical solution, when adjacent inner templates are installed, the first card ridge of the top wall of one inner template is snapped into the first card groove of the bottom wall of another inner template, so as to facilitate the installation of vertically adjacent inner templates; the second card ridge of the side wall of one inner template is snapped into the second card groove of the side wall of another inner template, so as to facilitate the installation of horizontally adjacent inner templates.

[0023] Optionally, the first card corrugated top wall and the first card slot are both fixedly connected with first magnetic strips that attract each other;

[0024] The second card flute surface and the second card slot are both fixedly connected with second magnetic strips that attract each other.

[0025] By adopting the above technical solution, through the magnetic attraction of the two first magnetic strips and the magnetic attraction of the two second magnetic strips, it is convenient to seal the gap between the two adjacent inner formworks, thereby preventing concrete from leaking out of the gap between the two adjacent inner formworks and, at the same time, improving the connection performance of the two adjacent inner formworks.

[0026] Optionally, the top wall of the outer template is fixedly connected with a third card flute, the bottom wall of the outer template is provided with a third card slot, and the third card flute of one outer template is card-connected with the third card slot of the bottom wall of another outer template;

[0027] A fourth card flute is fixedly connected to one side of the outer template, and a fourth card slot is opened on the other side of the outer template. The fourth card flute of one outer template is card-connected in the fourth card slot of another outer template.

[0028] By adopting the above technical solution, when adjacent outer formworks are installed, the third card ridge of the top wall of one outer formwork is snapped into the third card groove of the bottom wall of another outer formwork, so as to facilitate the installation of vertically adjacent outer formworks; the fourth card ridge of the side wall of one outer formwork is snapped into the fourth card groove of the side wall of another outer formwork, so as to facilitate the installation of horizontally adjacent outer formworks.

[0029] Optionally, the third card corrugated top wall and the third card slot are both fixedly connected with a third magnetic strip that attracts each other;

[0030] The fourth card flute surface and the fourth card slot are both fixedly connected with fourth magnetic strips that attract each other.

[0031] By adopting the above technical solution, through the magnetic attraction of the two third magnetic strips and the magnetic attraction of the two fourth magnetic strips, it is convenient to seal the gap between the two adjacent outer formworks, thereby preventing concrete from leaking out of the gap between the two adjacent outer formworks and improving the connection performance of the two adjacent outer formworks.

[0032] On the other hand, the present application provides a construction method of a modular building, which adopts the following technical solution:

[0033] A construction method for a modular building comprises the following steps:

[0034] S1. Install the inner formwork and the outer formwork until the inner formwork and the outer formwork form a layer of wall;

[0035] S2. Install connecting steel bars;

[0036] S3, pouring concrete into the cavity formed by the inner formwork and the outer formwork;

[0037] S4, vibration;

[0038] S5. Repeat steps S1, S2, S3 and S4 on the lower foundation until the entire wall structure is formed and the construction is completed.

[0039] By adopting the above technical solution, the wall can be quickly formed. Compared with the construction of brick-concrete structure, the forming efficiency of the wall is improved and the construction period is shortened.

[0040] In summary, the present application includes at least one of the following beneficial technical effects:

[0041] 1. A connection structure and construction method of a modular building is designed. The first installation component is scalable. When the connecting steel bar is too long or too short, the staff does not need to use tools to adjust the straight and curved sections, which improves the installation efficiency of the connecting steel bar, reduces the labor intensity of the staff, and saves time and effort.

[0042] 2. A connection structure and construction method of a modular building is designed, which facilitates sealing the gap between two adjacent inner templates through two mutually attracted first magnetic strips and two mutually attracted second magnetic strips, thereby preventing concrete from leaking out of the gap between the two adjacent inner templates, reducing concrete waste, and at the same time, improving the connection performance of the two adjacent inner templates;

[0043] 3. A connection structure and construction method of a modular building is designed, which facilitates sealing the gap between two adjacent outer formworks through two mutually attractive third magnetic strips and two mutually attractive fourth magnetic strips, thereby preventing concrete from leaking out of the gap between the two adjacent outer formworks, reducing concrete waste, and at the same time, improving the connection performance of the two adjacent outer formworks. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a structural schematic diagram of a connection structure of a modular building in an embodiment of the present application;

[0045] Figure 2 is a cross-sectional view of a connection structure of a modular building according to an embodiment of the present application;

[0046] Figure 3 yes Figure 2 A magnified view of part A;

[0047] Figure 4 yes Figure 2 A magnified view of part B;

[0048] Figure 5 is a cross-sectional view of an inner template of an embodiment of the present application;

[0049] Figure 6 yes Figure 5 Enlarged view of part C;

[0050] Figure 7 yes Figure 5 A magnified view of part D in the middle;

[0051] Figure 8 is a cross-sectional view of an outer template of an embodiment of the present application;

[0052] Fig. 9 yes Figure 8 Enlarged view of part E in the middle;

[0053] Fig.10 yes Figure 8 Enlarged view of part F.

[0054] Figure numerals: 1, inner template; 11, first card edge; 12, first slot; 13, second card edge; 14, second slot; 15, first magnetic strip; 16, second magnetic strip; 2, outer template; 21, third card edge; 22, third slot; 23, fourth card edge; 24, fourth slot; 25, third magnetic strip; 26, fourth magnetic strip; 3, connecting steel bars; 31, straight and bent sections; 4, mounting mechanism; 41, fixing block; 411, closing retaining ring; 42, sliding block; 421, connecting hole; 422, expanding boss; 43, first mounting block; 431, plug-in hole; 44, first spring; 45, second spring; 46, second mounting block; 461, through hole; 5, cavity. DETAILED DESCRIPTION

[0055] The following is combined with Figure 1-10 This application is described in further detail.

[0056] The embodiments of the present application disclose a connection structure and a construction method of a modular building.

[0057] First, refer to Figure 1 A connection structure of a modular building includes a plurality of inner formworks 1, a plurality of outer formworks 2, connecting steel bars 3 installed between the inner formworks 1 and the outer formworks 2, and an installation mechanism 4 for installing the connecting steel bars 3. An inner formwork 1 is arranged opposite to an outer formwork 2, and the plurality of inner formworks 1 and the plurality of outer formworks 2 jointly form a cavity 5 for pouring concrete. Both ends of the connecting steel bars 3 are integrally connected with straight and bent sections 31. The connecting steel bars 3 are arranged horizontally, and two adjacent inner formworks 1 are clamped together, and two adjacent outer formworks 2 are clamped together.

[0058] Reference Figure 2 and Figure 3The mounting mechanism 4 includes a first mounting component and a second mounting component. The first mounting component includes a fixed block 41, a slider 42, a first mounting block 43 and a first spring 44 for pushing the slider 42 to move toward the inner template 1. The fixed block 41 is clamped on the side of the outer template 2 close to the inner template 1 and extends into the outer template 2. The fixed block 41 is sleeved on the slider 42 and is slidably connected with the slider 42. The sliding direction is the perpendicular direction of the plane where the outer template 2 is located. In order to prevent the slider 42 from detaching from the fixed block 41, in this embodiment, the slider 42 is integrally connected with a flaring boss 422 on the side close to the outer template 2, and the fixed block 41 is integrally connected with a closing retaining ring 411 for abutting the flaring boss 422 on the side away from the outer template 2. In this embodiment, the number of first springs 44 is one, and the number of first springs 44 in this application can be two. As long as the slider 42 is pushed toward the inner template 1, the first spring 44 is arranged in the inner cavity of the fixed block 41, and one end of the first spring 44 is close to the fixed block 41 The inner wall of one side of the outer template 2 is welded, and the other end abuts against the flared boss 422. The first mounting block 43 is arranged in the inner cavity of the slider 42 and is slidably connected with the slider 42. The inner cavity of the slider 42 is provided with a second spring 45 for pushing the first mounting block 43 to move toward the outer template 2. One end of the second spring 45 abuts against the inner wall of the slider 42 away from the outer template 2, and the other end abuts against the first mounting block 43. One end of the first mounting block 43 away from the second spring 45 abuts against the inner wall of the slider 42 close to the outer template 2. A plug-in hole 431 for plugging in the straight and bent section 31 is provided on the first mounting block 43, and a connecting hole 421 for the straight and bent section 31 to pass through is provided on the slider 42. The connecting hole 421 is waist-shaped, and the plug-in hole 431 is connected to the connecting hole 421. In order to facilitate the sliding of the guide slider 42 and the first mounting block 43, the cross-sections of the fixed block 41, the slider 42 and the first mounting block 43 in this embodiment are rectangular, and the second mounting assembly is provided on the side of the inner template 1 close to the outer template 2.

[0059] Reference Figure 2 , Figure 3 as well as Figure 4 The second mounting assembly includes a second mounting block 46, which is clamped on the side of the inner template 1 close to the outer template 2 and extends into the inner template 1. The second mounting block 46 is at the same height as the first mounting block 43 and is arranged opposite to each other. The cross-section of the second mounting block 46 can be rectangular or circular, as long as the installation of the straight and curved section 31 is achieved. In this embodiment, the cross-section of the second mounting block 46 is rectangular, and a penetration hole 461 for the straight and curved section 31 to penetrate is opened on the second mounting block 46.

[0060] Reference Figure 5 , Figure 6 as well as Figure 7The top wall of the inner template 1 is integrally connected with a first card flute 11, and the bottom wall of the inner template 1 is provided with a first card groove 12. The first card flute 11 of one inner template 1 is connected to the first card groove 12 of the bottom wall of another inner template 1. A second card flute 13 is integrally connected to one side of the inner template 1, and a second card groove 14 is provided on the other side of the inner template 1. The second card flute 13 of one inner template 1 is connected to the second card groove 14 of another inner template 1. In order to facilitate sealing the gap between the first card flute 11 and the first card groove 12, in this embodiment, the top wall of the first card flute 11 and the first card groove 12 are both bonded with first magnetic strips 15 that attract each other. In order to facilitate sealing the gap between the second card flute 13 and the second card groove 14, in this embodiment, the surface of the second card flute 13 and the second card groove 14 are both bonded with second magnetic strips 16 that attract each other.

[0061] Reference Figure 8 , Fig. 9 as well as Fig.10 The top wall of the outer template 2 is integrally connected with a third card flute 21, and the bottom wall of the outer template 2 is provided with a third card groove 22, and the third card flute 21 of one outer template 2 is connected to the third card groove 22 of the bottom wall of another outer template 2; a fourth card flute 23 is integrally connected to one side of the outer template 2, and a fourth card groove 24 is provided on the other side of the outer template 2, and the fourth card flute 23 of one outer template 2 is connected to the fourth card groove 24 of another outer template 2; in order to facilitate sealing the gap between the third card flute 21 and the third card groove 22, in this embodiment, the top wall of the third card flute 21 and the third card groove 22 are both connected with a third magnetic strip 25 that attracts each other; in order to facilitate sealing the gap between the fourth card flute 23 and the fourth card groove 24, in this embodiment, the surface of the fourth card flute 23 and the fourth card groove 24 are both bonded with a fourth magnetic strip 26 that attracts each other.

[0062] The implementation principle of the connection structure of a modular building in the embodiment of the present application is as follows: two adjacent inner templates 1 are clamped together so that the first card rib 11 of the top wall of one inner template 1 is clamped into the first card groove 12 of the bottom wall of the other inner template 1, and the two first magnetic strips 15 attract and fit each other, and at the same time, the second card rib 13 of the side wall of one inner template 1 is clamped into the second card groove 14 of the side wall of the other inner template 1, and the two second magnetic strips 16 attract and fit each other; then, two adjacent outer templates 2 are clamped together so that the top wall of one outer template 2 The third card rib 21 is connected to the third card slot 22 of the bottom wall of the other outer template 2, and the two third magnetic strips 25 attract and fit each other. At the same time, the fourth card rib 23 of the side wall of one outer template 2 is connected to the fourth card slot 24 of the side wall of the other outer template 2, and the two fourth magnetic strips 26 attract and fit each other until a layer of wall is formed, and then the connecting steel bar 3 is installed. When installing the connecting steel bar 3, firstly, a straight and bent section 31 of the connecting steel bar 3 is passed through the connecting hole 421 and inserted into the plug hole 431, and then the other straight and bent section 31 of the connecting steel bar 3 is passed through the connecting hole 421 and inserted into the plug hole 431. The straight and curved sections 31 are inserted into the corresponding insertion holes 461; when the distance between the two straight and curved sections 31 is slightly larger than the distance between the plug hole 431 and the insertion hole 461, the staff applies force to the connecting steel bar 3, and the straight and curved sections 31 drive the first mounting block 43 to move toward the outer template 2, and the first mounting block 43 drives the slider 42 to slide, and the slider 42 compresses the first spring 44 in the inner cavity of the fixing block 41, increasing the distance between the connecting hole 421 and the insertion hole 461, until the straight and curved sections 31 can be installed with the second mounting block 46; when the distance between the two straight and curved sections 31 is When it is slightly smaller than the distance between the plug-in hole 431 and the through hole 461, the staff applies force to the connecting steel bar 3, and the straight-bend section 31 drives the first mounting block 43 to move toward the side of the inner template 1. The first mounting block 43 compresses the second spring 45, thereby reducing the distance between the connecting hole 421 and the connection point on the second mounting assembly until the straight-bend section 31 can be installed with the second mounting assembly. The staff does not need to use tools to adjust the straight-bend section 31, which improves the installation efficiency of the connecting steel bar 3, reduces the labor intensity of the staff, and saves time and effort.

[0063] In a second aspect, the present application discloses a construction method of a modular building, comprising the following steps:

[0064] S1, installing the inner formwork 1 and the outer formwork 2 until the inner formwork 1 and the outer formwork 2 form a layer of wall;

[0065] S2, install connecting steel bars 3;

[0066] S3, pouring concrete into the cavity 5 formed by the inner formwork 1 and the outer formwork 2;

[0067] S4, vibration;

[0068] S5. Repeat steps S1, S2, S3 and S4 on the lower foundation until the entire wall structure is formed and the construction is completed.

[0069] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A connection structure of a modular building, comprising a plurality of inner formworks (1), a plurality of outer formworks (2) and connecting steel bars (3) arranged between the inner formworks (1) and the outer formworks (2), wherein one inner formwork (1) and one outer formwork (2) are arranged opposite to each other, the inner formwork (1) and the outer formwork (2) together form a cavity (5) for pouring concrete, both ends of the connecting steel bars (3) are provided with straight and bent sections (31), two adjacent inner formworks (1) are clamped together, and two adjacent outer formworks (2) are clamped together, and the characteristics are: It also includes a mounting mechanism (4) for mounting the connecting steel bars (3); The mounting mechanism (4) comprises a first mounting component and a second mounting component; The first installation assembly comprises a fixed block (41), a sliding block (42), a first installation block (43), and a first spring (44) for pushing the sliding block (42) to move toward the inner template (1); The fixing block (41) is fixedly connected to a side of the outer template (2) close to the inner template (1); the fixing block (41) is sleeved on the slider (42) and is slidably connected to the slider (42); the sliding direction is the perpendicular direction of the plane where the outer template (2) is located; the first mounting block (43) is arranged in the inner cavity of the slider (42); and the first mounting block (43) is provided with a plug-in hole (431) for plugging in the straight-bend section (31); the slider (42) is provided with a connecting hole (421) for the straight-bend section (31) to pass through; the plug-in hole (431) is communicated with the connecting hole (421); and the first spring (44) is arranged in the inner cavity of the fixing block (41); The sliding block (42) is fixedly connected to a flaring boss (422) on one side close to the outer template (2), and the fixing block (41) is fixedly connected to a closing retaining ring (411) for abutting the flaring boss (422) on one side away from the outer template (2); the first mounting block (43) is slidably connected to the sliding block (42), and a second spring (45) is provided in the inner cavity of the sliding block (42) for pushing the first mounting block (43) to move toward the outer template (2); the connecting hole (421) is waist-shaped; The second mounting assembly is arranged on a side of the inner template (1) close to the outer template (2); The second mounting assembly comprises a second mounting block (46), the second mounting block (46) being fixedly connected to a side of the inner template (1) close to the outer template (2), and the second mounting block (46) being provided with a penetration hole (461) for the straight and bent section (31) to penetrate.

2. A modular building connection structure according to claim 1, characterized in that: The top wall of the inner template (1) is fixedly connected with a first card flute (11), and the bottom wall of the inner template (1) is provided with a first card slot (12), and the first card flute (11) of one inner template (1) is card-engaged in the first card slot (12) of the bottom wall of another inner template (1); A second card flute (13) is fixedly connected to one side of the inner template (1), and a second card slot (14) is opened on the other side of the inner template (1). The second card flute (13) of one inner template (1) is card-engaged in the second card slot (14) of another inner template (1).

3. The connection structure of a modular building according to claim 2, characterized in that: The top wall of the first card flute (11) and the first card slot (12) are both fixedly connected with first magnetic strips (15) that attract each other; The surface of the second card flute (13) and the second card slot (14) are both fixedly connected with second magnetic strips (16) that attract each other.

4. The connection structure of a modular building according to claim 1, characterized in that: The top wall of the outer template (2) is fixedly connected with a third card flute (21), and the bottom wall of the outer template (2) is provided with a third card slot (22), and the third card flute (21) of one outer template (2) is card-engaged in the third card slot (22) of the bottom wall of another outer template (2); A fourth card flute (23) is fixedly connected to one side of the outer template (2), and a fourth card slot (24) is provided on the other side of the outer template (2). The fourth card flute (23) of one outer template (2) is card-engaged in the fourth card slot (24) of another outer template (2).

5. The connection structure of a modular building according to claim 4, characterized in that: The top wall of the third card flute (21) and the third card slot (22) are both fixedly connected with a third magnetic strip (25) that attracts each other; The surface of the fourth card flute (23) and the fourth card slot (24) are both fixedly connected with a fourth magnetic strip (26) that attracts each other.

6. A construction method of a modular building, based on the connection structure of the modular building according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, installing the inner formwork (1) and the outer formwork (2) until the inner formwork (1) and the outer formwork (2) form a layer of wall; S2, installing connecting steel bars (3); S3, pouring concrete into the cavity (5) formed by the inner formwork (1) and the outer formwork (2); S4, vibration; S5. Repeat steps S1, S2, S3 and S4 on the lower foundation until the entire wall structure is formed and the construction is completed.

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