Rapid installation structure of square cabin

By employing sliding-fit connection slots and plug structures, as well as guide grooves and blocks in the modular shelter, the problem of time-consuming sidewall installation was solved, enabling a fast and stable modular shelter construction process and improving overall impact resistance.

CN223548729UActive Publication Date: 2025-11-14SUPERB TENT CO LTD
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Patent Information

Application Number
CN202422920486.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-11-14
Estimated Expiration
2034-11-28

AI Technical Summary

Technical Problem

The installation of the side walls of the modular shelter takes a long time, affecting the construction time, and the bolt fixing requires high precision in the hole position, which makes the installation inconvenient.

Method used

The sliding-fit connection slot and plug structure, combined with the bidirectional guiding design of the guide groove and guide block, simplifies the installation process of the side wall and ceiling, avoids the requirement of hole accuracy for bolt connection, and achieves stable fixation through snap-fit ​​or magnetic connection.

Benefits of technology

The installation process for the side walls and ceiling has been simplified, the installation speed has been increased, the stability and impact resistance have been enhanced, and the reliance on tools has been reduced.

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Abstract

The utility model discloses a quick mounting structure of a square cabin, which relates to the field of square cabins, and has the technical key points that the quick mounting structure comprises a bottom frame, a plurality of supporting columns are arranged at the top of the bottom frame, a first mounting cavity is arranged between every two adjacent supporting columns, a side wall part is arranged in each first mounting cavity, a top frame is arranged at the tops of the supporting columns, and the top frame is provided with a plurality of side wall parts. A second mounting cavity is formed in the top frame, a ceiling part is arranged in the second mounting cavity, the side wall part comprises a first wall body and two second wall bodies, the first wall body is located between the two second wall bodies, and the first wall body and the second wall bodies are in sliding fit with the first mounting cavity; first connecting inserting grooves are formed in the two sides of the first wall body, and a first connecting inserting block is arranged on one side of the second wall body, so that the technical problem that the construction time of the shelter is affected due to the fact that the time consumed for mounting the side wall part is long is solved.
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Description

Technical Field

[0001] This utility model relates to the field of modular shelters, and in particular to a quick installation structure for modular shelters. Background Technology

[0002] The construction materials for modular shelters typically include steel, aluminum alloy, and high-strength composite materials. They usually adopt a modular design, which includes a base frame with multiple support columns. Adjacent support columns are connected by side walls, which surround each other to form a usable cavity. The usable cavity is the main usable area inside the shelter and can be functionally divided and laid out as needed. The top of the support columns is equipped with a top frame, and the interior of the top frame contains a canopy. The canopy is located above the usable cavity, allowing the shelter to be assembled in a short time for use.

[0003] However, the installation of the sidewalls currently requires bolts for fixing. Bolt fixing requires very precise hole positions. If the hole positions are off, the bolts may be difficult to screw in or may not achieve the expected fixing effect. In addition, bolt fixing requires corresponding tools, which makes the installation of the sidewalls time-consuming and affects the construction time of the modular shelter. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a quick installation structure for a modular shelter, aiming to solve the technical problem that the long installation time of the side walls affects the construction time of the modular shelter.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A quick-installation structure for a modular shelter includes a base frame with multiple support columns on top. A first installation cavity separates adjacent support columns. A sidewall portion is located within the first installation cavity. A top frame is located on top of each support column. A second installation cavity is formed inside the top frame. A ceiling portion is located within the second installation cavity. The sidewall portion includes a first wall and two second walls. The first wall is located between the two second walls. The first wall and the second walls slide within the first installation cavity. First connecting slots are located on both sides of the first wall. A first connecting block is located on one side of each of the second walls. The first connecting slots on both sides of the first wall respectively engage with the first connecting blocks on one side of each of the two second walls. The other side of the second wall abuts against an adjacent support column.

[0007] When the first wall and the second wall are assembled, they can slide along the first mounting cavity. When the first wall and the second wall are moved to the corresponding positions, the first wall and the second wall adopt the plug-in structure of the first connecting block and the first connecting slot to complete the connection between the first wall and the second wall. This simplifies the installation method of the side wall, avoids the strict requirements of hole position accuracy of traditional bolt connection, and does not require additional tools to assist in the installation.

[0008] Furthermore, in this application, a connecting plug is provided on the other side of the second wall, and second connecting slots are provided on both sides of the support column, and the connecting plug is inserted into the adjacent second connecting slot.

[0009] Once the second wall is moved to the appropriate position, the connecting end is inserted into the adjacent second connecting slot. The structural constraint of the second connecting slot prevents the second wall from shifting horizontally after installation, thus ensuring the stability of the second wall when subjected to wind loads or other external forces.

[0010] Furthermore, in this application, the bottom of the top frame is provided with a guide top groove, the top of the first wall and the second wall is provided with a guide top, the guide top of the first wall and the second wall are slidably engaged with the guide top groove, the bottom of the first wall and the second wall is provided with a guide bottom block, the top of the base frame is provided with a guide bottom groove, and the guide bottom block of the first wall and the second wall is slidably engaged with the guide bottom groove.

[0011] By setting guide top grooves and guide bottom grooves at the bottom of the top frame and the top of the base frame respectively, and cooperating with the guide top at the top of the wall and the guide bottom block at the bottom, a two-way guide structure in the vertical direction is formed. This ensures that the first wall and the second wall are firmly fixed in the second installation cavity after installation, while preventing them from shifting in the lateral or vertical direction, thus enhancing the stability of the first wall and the second wall and the overall impact resistance.

[0012] Furthermore, in this application, the canopy includes a first top plate and two second top plates, the two second top plates being located on both sides of the first top plate. The first top plate and the second top plates are slidably fitted with the second mounting cavity. The first top plate is provided with third connecting slots on both sides, and the second top plate is provided with a second connecting block on one side. The third connecting slots on both sides of the first top plate are respectively inserted into the second connecting blocks on one side of the two second top plates.

[0013] Furthermore, in this application, guide grooves are provided on both sides of the interior of the second mounting cavity, so that the sides of the first top plate and the second top plate respectively slide in cooperation with the guide grooves on both sides of the second mounting cavity.

[0014] Furthermore, this application also includes a display panel, with an external mounting frame provided on the exterior of any of the supporting columns, an internal mounting beam provided on the internal mounting frame, a mounting bracket provided on one side of the display panel, a mounting slot provided at the bottom of the mounting bracket, and a mounting protrusion provided at the top of the mounting beam, the mounting slot being inserted into the mounting protrusion.

[0015] Furthermore, in this application, the base frame has a third mounting cavity inside, and the third mounting cavity has multiple supporting bottom beams inside. The two ends of the supporting bottom beams have positioning slots, and the two sides of the third mounting cavity have positioning blocks. The positioning slots are respectively inserted into the adjacent positioning blocks.

[0016] Furthermore, in this application, the interior of the third mounting cavity is provided with a base plate, which is located on top of the supporting bottom beam, so that the base plate abuts against the supporting bottom beam.

[0017] Furthermore, this application also includes a supporting counterweight, which is disposed at the bottom of the base frame. The top of the supporting counterweight is provided with a connecting bottom column, and the bottom of the base frame is provided with an insertion bottom groove. The connecting bottom column is inserted into the insertion bottom groove. A fixing hole is provided inside the connecting bottom column, and a fixing slot communicating with the insertion bottom groove is provided outside the base frame. The fixing slot faces the fixing hole, so that an external pin can be inserted into the fixing hole and the fixing slot.

[0018] Furthermore, in this application, the top of the supporting counterweight is provided with a fixing hole, and the bottom of the connecting base column is provided with a fixing end, the fixing end being threaded into the fixing hole.

[0019] This utility model has the following beneficial effects:

[0020] When the first wall and the second wall are assembled, they can slide along the first mounting cavity. When the first wall and the second wall are moved to the corresponding positions, the first wall and the second wall adopt the plug-in structure of the first connecting block and the first connecting slot to complete the connection between the first wall and the second wall. This simplifies the installation method of the side wall, avoids the strict requirements of hole position accuracy of traditional bolt connection, and does not require additional tools to assist in the installation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the first and second top plates of this utility model.

[0023] Figure 3This is a structural schematic diagram of the first and second walls of this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of the guide block of this utility model.

[0025] Figure 5 This is a schematic diagram of the guide tip of this utility model.

[0026] Figure 6 This is a schematic diagram of the base plate of this utility model.

[0027] Figure 7 This is a schematic diagram of the structure of the display panel of this utility model.

[0028] Figure 8 This is a schematic diagram of the connecting base column of this utility model.

[0029] Figure 9 This is a schematic diagram of the insertion bottom groove of this utility model.

[0030] Figure 10 yes Figure 2 Enlarged view of point A in the image.

[0031] Figure 11 yes Figure 3 Enlarged view of point B in the image.

[0032] In the attached figures, the following labels are used:

[0033] 1. Base frame; 2. Support column; 3. Top frame; 4. First mounting cavity; 5. Side wall; 6. Ceiling; 7. First wall; 8. Second wall; 9. First connecting block; 10. First connecting slot; 11. Guide bottom block; 12. Guide bottom groove; 13. Guide top groove; 14. Guide top; 15. Second connecting slot; 16. Second mounting cavity; 17. Connecting end; 18. Third connecting slot; 19. Second connecting block; 20. First top plate 21. Second top plate; 22. Guide slide; 23. Mounting frame; 24. Mounting beam; 25. Mounting insert; 26. Mounting bracket; 27. Mounting slot; 28. Display board; 29. ​​Support counterweight; 30. Connecting base column; 31. Fixed end; 32. Fixed hole; 33. Fixed insertion hole; 34. Insertion bottom groove; 35. Fixed slot; 36. Third mounting cavity; 37. Base plate; 38. Supporting bottom beam; 39. Positioning slot; 40. Positioning block. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, 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. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; 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.

[0037] Reference Figures 1-6 , Figure 11In some specific embodiments, a quick-installation structure for a modular shelter includes a base frame 1. The top of the base frame 1 is provided with multiple support columns 2. A first installation cavity 4 separates adjacent support columns 2. A side wall portion 5 is provided within the first installation cavity 4. A top frame 3 is provided on the top of the support columns 2. A second installation cavity 16 is opened inside the top frame 3. A ceiling portion 6 is provided within the second installation cavity 16. The side wall portion 5 includes a first wall 7 and two second walls 8. The first wall 7 is located between the two second walls 8. The first wall 7 and the second wall 8 are slidably engaged with the first installation cavity 4. First connecting slots 10 are provided on both sides of the first wall 7. A first connecting plug 9 is provided on one side of each of the two second walls 8. The first connecting slots 10 on both sides of the first wall 7 are respectively inserted into the first connecting plug 9 on one side of each of the two second walls 8. The other side of the second wall 8 abuts against an adjacent support column 2.

[0038] With the above technical solution, when the first wall 7 and the second wall 8 are assembled, they can slide along the first mounting cavity 4. When the first wall 7 and the second wall 8 are moved to the corresponding positions, the first wall 7 and the second wall 8 adopt the plug-in structure of the first connecting block 9 and the first connecting slot 10 to complete the connection between the first wall 7 and the second wall 8. This simplifies the installation method of the side wall 5, avoids the strict requirements of hole position accuracy of traditional bolt connection, and does not require additional tools to assist in installation.

[0039] In addition, the first connecting block 9 and the first connecting slot 10 can be replaced with snap-fit ​​connection or magnetic connection to meet the usage needs of different application scenarios.

[0040] Reference Figures 3-6 In some specific embodiments, a connecting plug 17 is provided on the other side of the second wall 8, and second connecting slots 15 are provided on both sides of the support column 2, and the connecting plug 17 is plugged into the adjacent second connecting slot 15.

[0041] With the above technical solution, when the second wall 8 is moved to the corresponding position, the connecting end 17 is inserted into the adjacent second connecting slot 15. Relying on the structural constraint of the second connecting slot 15, the second wall 8 is prevented from shifting horizontally after installation, so that the second wall 8 remains stable when subjected to wind load or other external forces.

[0042] Reference Figures 3-6 In some specific embodiments, the bottom of the top frame 3 is provided with a guide top groove 13, the top of the first wall 7 and the second wall 8 is provided with a guide top 14, the guide top 14 of the first wall 7 and the second wall 8 are slidably engaged with the guide top groove 13, the bottom of the first wall 7 and the second wall 8 is provided with a guide bottom block 11, the top of the base frame 1 is provided with a guide bottom groove 12, the guide bottom block 11 of the first wall 7 and the second wall 8 are slidably engaged with the guide bottom groove 12.

[0043] Through the above technical solution, by setting guide top groove 13 and guide bottom groove 12 at the bottom of top frame 3 and the top of base frame 1 respectively, and cooperating with guide top 14 at the top of the wall and guide bottom block 11 at the bottom, a two-way guide structure in the vertical direction is formed. This also ensures that the first wall 7 and the second wall 8 are firmly fixed in the second installation cavity 16 after installation, while preventing them from displacing in the lateral or vertical direction, thereby enhancing the stability and overall impact resistance of the first wall 7 and the second wall 8.

[0044] Reference Figures 1-2 , Figure 10 In some specific embodiments, the canopy portion 6 includes a first top plate 20 and two second top plates 21. The two second top plates 21 are located on both sides of the first top plate 20. The first top plate 20 and the second top plate 21 are slidably fitted with the second mounting cavity 16. The first top plate 20 is provided with third connecting slots 18 on both sides, and the second top plate 21 is provided with second connecting blocks 19 on one side. The third connecting slots 18 on both sides of the first top plate 20 are respectively inserted into the second connecting blocks 19 on one side of the two second top plates 21.

[0045] With the above technical solution, when the canopy section 6 is installed, the first top plate 20 and the second top plate 21 slide into the second installation cavity 16. When the first top plate 20 and the second top plate 21 slide to the corresponding positions, the third connecting slot 18 of the first top plate 20 and the second connecting plug 19 of the second top plate 21 are inserted. This sliding fit simplifies the installation process of the canopy section 6. Furthermore, the fit between the third connecting slot 18 and the second connecting plug 19 ensures a firm connection between the top plates, further reducing the number of screws and increasing the speed of the modular shelter construction.

[0046] Reference Figure 2 In some specific embodiments, guide grooves 22 are provided on both sides of the interior of the second mounting cavity 16, so that the sides of the first top plate 20 and the second top plate 21 respectively slide in cooperation with the guide grooves 22 on both sides of the second mounting cavity 16.

[0047] Through the above technical solution, the guide groove 22 provides lateral constraints to the first top plate 20 and the second top plate 21 by sliding cooperation between the two sides of the first top plate 20 and the second top plate 21, thereby achieving precise guidance and positioning of the ceiling section 6.

[0048] Reference Figures 1-2 , Figure 7 In some specific embodiments, it also includes a display panel 28, an outer mounting frame 23 is provided on the outside of any of the support columns 2, an inner mounting beam 24 is provided inside the outer mounting frame 23, an mounting bracket 26 is provided on one side of the display panel 28, an mounting slot 27 is provided at the bottom of the mounting bracket 26, and an mounting protrusion 25 is provided at the top of the mounting beam 24, and the mounting slot 27 is inserted into the mounting protrusion 25.

[0049] Through the above technical solution, the display panel 28 is usually used to display the purpose or precautions of the container. When the display panel 28 is installed, the mounting slot 27 of the mounting bracket 26 is inserted into the mounting protrusion 25 of the mounting beam 24, so that the installation process does not require additional tools, the operation is simple, and a quick disassembly and assembly method is provided.

[0050] Reference Figure 6 In some specific embodiments, the base frame 1 has a third mounting cavity 36 inside, and the third mounting cavity 36 has a plurality of supporting bottom beams 38 inside. The two ends of the supporting bottom beams 38 have positioning slots 39, and the two sides of the third mounting cavity 36 have positioning blocks 40. The positioning slots 39 are respectively inserted into the adjacent positioning blocks 40.

[0051] Through the above technical solution, when the positioning slot 39 of the support bottom beam 38 is inserted into the positioning block 40 of the third mounting cavity 36, the support bottom beam 38 is located inside the third mounting cavity 36. The support bottom beam 38 forms a uniform load-bearing structure inside the third mounting cavity 36 of the base frame 1, which significantly improves the compressive and bending resistance of the bottom of the container. Furthermore, the insertion method of the positioning slot 39 and the block makes it easy to disassemble the support bottom beam 38 when it needs to be replaced or maintained, thus improving the maintainability of the base frame 1.

[0052] Reference Figure 6 In some specific embodiments, a base plate 37 is provided inside the third mounting cavity 36. The base plate 37 is located on top of the supporting bottom beam 38, so that the base plate 37 abuts against the supporting bottom beam 38.

[0053] Through the above technical solution, by setting a base plate 37 on the supporting bottom beam 38 of the third installation cavity 36, a stable load-bearing surface is formed by the contact between the base plate 37 and the supporting bottom beam 38, providing a solid bottom support for the internal space of the container. At the same time, it is convenient to lay floor materials or install other components on the base plate 37 later, thereby improving the usability of the container.

[0054] Reference Figures 8-9 In some specific embodiments, a supporting counterweight 29 is also included. The supporting counterweight 29 is located at the bottom of the base frame 1. A connecting bottom post 30 is provided at the top of the supporting counterweight 29. A bottom insertion groove 34 is provided at the bottom of the base frame 1. The connecting bottom post 30 is inserted into the bottom insertion groove 34. A fixing insertion hole 33 is provided inside the connecting bottom post 30. A fixing slot 35 communicating with the bottom insertion groove 34 is provided outside the base frame 1. The fixing slot 35 faces the fixing insertion hole 33, so that an external pin can be inserted into the fixing insertion hole 33 and the fixing slot 35.

[0055] Through the above technical solution, the supporting counterweight 29 is inserted into the insertion groove 34 of the base frame 1 through the connecting column 30, and locked by the external pin passing through the fixing hole 33 and the fixing slot 35. This design provides a stable foundation for the cabin, and when the cabin needs to be moved, the pin can be easily removed to disconnect the supporting counterweight 29 from the base frame 1, reduce the overall weight, and facilitate movement and transportation.

[0056] Reference Figures 8-9 In some specific embodiments, a fixing hole 32 is provided at the top of the supporting counterweight 29, and a fixing end 31 is provided at the bottom of the connecting base column 30. The fixing end 31 is threadedly engaged with the fixing hole 32.

[0057] The above technical solution utilizes threaded connections to achieve a secure connection between the supporting counterweight 29 and the connecting base column 30, ensuring that the counterweight will not loosen during operation, thus improving structural stability. Furthermore, the threaded connection method is easy to operate, allowing for quick installation and disassembly of the supporting counterweight 29 without the need for special tools, which facilitates the movement and maintenance of the container.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A quick-installation structure for a modular shelter, comprising a base frame, a plurality of support columns on the top of the base frame, a first installation cavity spaced between adjacent support columns, a sidewall portion within the first installation cavity, a top frame on the top of each support column, and a second installation cavity inside the top frame, the second installation cavity containing a ceiling portion, characterized in that, The side wall includes a first wall and two second walls. The first wall is located between the two second walls. The first wall and the second walls slide in the first mounting cavity. The first wall has first connecting slots on both sides. The second wall has a first connecting block on one side. The first connecting slots on both sides of the first wall are respectively inserted into the first connecting blocks on one side of the two second walls. The other side of the second wall abuts against the adjacent support column.

2. The quick-installation structure for a modular shelter according to claim 1, characterized in that, The other side of the second wall is provided with a connecting plug, and the two sides of the support column are provided with second connecting slots, and the connecting plug is inserted into the adjacent second connecting slot.

3. The quick-installation structure for a modular shelter according to claim 2, characterized in that, The bottom of the top frame is provided with a guide top groove, the top of the first wall and the second wall is provided with a guide top, the guide top of the first wall and the second wall are slidably engaged with the guide top groove, the bottom of the first wall and the second wall is provided with a guide bottom block, the top of the base frame is provided with a guide bottom groove, and the guide bottom block of the first wall and the second wall is slidably engaged with the guide bottom groove.

4. The quick installation structure for a modular shelter according to claim 1, characterized in that, The canopy includes a first top plate and two second top plates, with the two second top plates located on both sides of the first top plate. The first top plate and the second top plates slide in fit with the second mounting cavity. The first top plate has third connecting slots on both sides, and the second top plate has a second connecting block on one side. The third connecting slots on both sides of the first top plate are respectively inserted into the second connecting blocks on one side of the two second top plates.

5. The quick-installation structure for a modular shelter according to claim 4, characterized in that, The second mounting cavity has guide grooves on both sides inside, so that the sides of the first top plate and the second top plate slide in cooperation with the guide grooves on both sides of the second mounting cavity.

6. The quick-installation structure for a modular shelter according to claim 1, characterized in that, It also includes a display panel, and each of the supporting columns is provided with an external mounting frame. The external mounting frame is provided with an internal mounting beam. One side of the display panel is provided with a mounting bracket. The bottom of the mounting bracket is provided with a mounting slot. The top of the mounting beam is provided with a mounting protrusion. The mounting slot is inserted into the mounting protrusion.

7. The quick installation structure for a modular shelter according to claim 1, characterized in that, The base frame has a third mounting cavity inside, and the third mounting cavity has multiple supporting bottom beams inside. The two ends of the supporting bottom beams have positioning slots, and the two sides of the third mounting cavity have positioning blocks. The positioning slots are respectively inserted into the adjacent positioning blocks.

8. The quick installation structure for a modular shelter according to claim 7, characterized in that, The third mounting cavity is provided with a base plate, which is located on top of the supporting bottom beam, so that the base plate abuts against the supporting bottom beam.

9. The quick installation structure for a modular shelter according to claim 1, characterized in that, It also includes a support counterweight, which is located at the bottom of the base frame. The top of the support counterweight is provided with a connecting bottom column, and the bottom of the base frame is provided with an insertion bottom groove. The connecting bottom column is inserted into the insertion bottom groove. The connecting bottom column is provided with a fixing hole inside, and the base frame is provided with a fixing slot communicating with the insertion bottom groove on the outside. The fixing slot faces the fixing hole, so that an external pin can be inserted into the fixing hole and the fixing slot.

10. The quick-installation structure for a modular shelter according to claim 9, characterized in that, The top of the supporting counterweight has a fixing hole, and the bottom of the connecting column has a fixing end, which is threaded into the fixing hole.