A membrane structure shed for foundation pit construction and a method of using the same

Abstract

The application relates to a membrane structure shed for foundation pit construction and a use method thereof, and belongs to the technical field of the membrane structure shed, which comprises a steel structure main body, a top air film and an air rib wall. The steel structure main body comprises a base, a stand column and a cross beam, the stand column is fixed on the base, the cross beam is fixed on the top of the stand column, the base, the stand column and the cross beam are all provided with multiple ones, adjacent stand columns are arranged at intervals along the edge of a foundation pit, and adjacent cross beams are connected in a head-tail mode. The top air film is fixed on the top of the cross beam. The air rib wall comprises a main cavity part and side cavity parts, the side cavity parts are symmetrically arranged on the two sides of the main cavity part, the side cavity parts are fixedly connected with the main cavity part, a through groove is arranged on the stand column and extends along the length direction of the stand column, and the side cavity parts are inserted into the through groove. A buckle assembly for detachably connecting the main cavity part and the stand column is arranged between the main cavity part and the stand column. The application has the effects that the air rib type air film can be used in the whole process stage of foundation pit construction, and the wind resistance is improved.

Description

Technical Field

[0001] This application relates to the technical field of membrane structure sheds, and in particular to a membrane structure shed for foundation pit construction and its usage method. Background Technology

[0002] Membrane structure sheds are erected as temporary facilities during building construction to control dust and noise generated during the construction of building foundation pits, thereby improving the construction environment.

[0003] Most existing air-supported membrane structures for foundation pits are ribbed air-supported membrane structures, which are air-supported membrane structures formed by connecting inflatable arch ribs with arc-shaped tubular membrane materials to cover the entire top of the foundation pit.

[0004] Existing air-ribbed air-supported membrane structures have limitations. Due to the limited support capacity of the inflatable arch ribs, they can only be used for small to medium-sized foundation pits. Furthermore, the height of the air-ribbed air-supported membrane structure is limited by its own arch height. During the later backfilling stage of the foundation pit, the height of the tower crane will exceed the height limit of the air-ribbed air-supported membrane structure, so it can only be used in the early stage of foundation pit construction. In addition, the wind resistance of the air-ribbed air-supported membrane structure is only level 7-9. All these factors combined result in the air-ribbed air-supported membrane structure having poor wind resistance and being limited to the early stage of foundation pit construction. Summary of the Invention

[0005] In order to use air-ribbed air-supported membrane structures throughout the entire process of foundation pit construction and to improve wind resistance, this application provides a membrane structure shed for foundation pit construction and its usage method.

[0006] In the first aspect, this application provides a membrane structure shed for foundation pit construction, adopting the following technical solution: A membrane structure shed for foundation pit construction includes a steel main body, a top air-supported membrane, and air-ribbed walls. The steel main body includes a base, columns, and beams. The columns are fixed to the base, and the beams are fixed to the top of the columns. Multiple bases, columns, and beams are provided. Adjacent columns are spaced apart along the edge of the foundation pit, and adjacent beams are connected end to end. The top air-supported membrane is fixed to the top of the beams. The air-ribbed walls include a main cavity and side cavities. Two side cavities are provided and symmetrically distributed on both sides of the main cavity. The side cavities are fixedly connected to the main cavity. A through groove is opened on the column along the length of the column, and the side cavities are inserted into the through groove. A snap-fit ​​assembly for detachable connection between the main cavity and the column is provided.

[0007] By adopting the above technical solutions, the steel structure provides stable high-level support for the top air-supported membrane, breaking through the height limitations of traditional air-ribbed air-supported membranes, adapting to the space required for tower crane operations, and achieving full coverage of the foundation pit excavation and backfilling process; the insertion and fit between the side cavity and the column through groove, combined with the detachable connection of the buckle assembly, not only ensures the connection stability between the air-ribbed wall and the steel structure, but also facilitates quick assembly and disassembly. At the same time, the air-ribbed wall and the steel structure work together to bear the force, improving the overall wind resistance performance.

[0008] Optionally, the column has a truss structure, and both the side cavity and the main cavity can be independently inflated and deflated; when the main cavity is inflated, the main cavity is pressed against the outer wall of the column.

[0009] By adopting the above technical solutions, the columns of the truss structure can reduce their own weight while ensuring the support strength. The independently inflatable side cavities and main cavities can be flexibly adjusted. After the main cavity is inflated, it presses tightly against the outer wall of the column, further enhancing the fit and sealing between the air rib wall and the column, improving the dust and noise control effect. Moreover, the wind resistance can be adjusted by individually deflating the side cavity, thus optimizing the wind resistance performance.

[0010] Optionally, the crossbeam is a truss structure, with a lower sliding groove and an upper sliding groove fixed on its outer wall. Both the lower and upper sliding grooves are arranged along the length of the crossbeam. A strip membrane assembly is provided on the crossbeam, which includes a motor, a screw, a slider, a strip membrane, and a connecting rod. The motor is fixed at the end of the lower sliding groove, and the output end of the motor is fixed to one end of the screw. The screw is rotatably disposed inside the lower sliding groove and is arranged along the length of the lower sliding groove. The screw passes through the slider and is threadedly connected to the slider. The slider is slidably disposed inside the lower sliding groove and slides along the length of the lower sliding groove. One end of the connecting rod is fixedly connected to the slider, and the connecting rod is fixed to one end of the strip membrane.

[0011] By adopting the above technical solutions, the truss structure beams balance strength and lightweight. The strip membrane assembly is driven by a motor-driven screw, which moves the slider, connecting rod and strip membrane along the slide groove to realize the automatic deployment and retraction of the strip membrane without manual operation, thus improving construction efficiency. At the same time, the strip membrane can further enclose the space above the foundation pit, enhancing the blocking effect of dust and noise.

[0012] Optionally, a rack is fixed inside the upper slide groove, the rack is arranged along the length of the upper slide groove, and a gear is fixed at the end of the connecting rod away from the slider, the gear meshing with the rack.

[0013] By adopting the above technical solution, the meshing of the gear and rack provides guidance and rotational force to the connecting rod, ensuring that the strip film moves smoothly along the length of the crossbeam during rotation, unfolding or rewinding, avoiding deviation, jamming or other issues, improving the stability and reliability of the strip film movement, and ensuring the consistency of the sealing effect.

[0014] Optionally, a pad is slidably disposed on the upper sliding groove, the pad slides along the length of the upper sliding groove, a connecting rod passes through the pad, and the connecting rod is rotated relative to the pad; a first corrugated cover is disposed on the lower sliding groove, one end of the first corrugated cover is fixed to the slider, and the other end is fixed to the outer wall of the lower sliding groove, the first corrugated cover is used to cover the inside of the lower sliding groove; a second corrugated cover is disposed on the upper sliding groove, one end of the second corrugated cover is fixed to the pad, and the other end is fixed to the outer wall of the upper sliding groove, the second corrugated cover is used to cover the inside of the upper sliding groove.

[0015] By adopting the above technical solution, the pad block supports the connecting rod, reduces the stress deformation of the connecting rod, and ensures the transmission stability; the first and second corrugated covers can effectively shield the screw, rack and other components inside the two slides, prevent dust and debris from entering during construction and causing jamming or damage, extend the service life of the equipment, and improve the sealing of the structure.

[0016] Optionally, a cable is provided on the air rib wall, with one end of the cable fixed to the outer wall of the main cavity and the other end used to be inserted and fixed to the ground outside the air rib wall.

[0017] By adopting the above technical solution, the cable connects the air rib wall to the ground, forming an oblique tensile support, which shares the wind load on the air rib wall, further improving the wind resistance stability of the air rib wall and the overall structure, and avoiding tilting or displacement under strong winds.

[0018] Optionally, the cable is provided with a branch cable, one end of which is fixed to the cable and the other end is fixed to the outer wall of the side cavity; when the branch cable is pulled in a direction away from the main cavity, the branch cable pulls the side cavity closer to the main cavity.

[0019] By adopting the above technical solution, the branch cable can provide additional traction and fixation to the side cavity, enhance the tightness of the fit between the side cavity and the column through groove, and reduce the swaying of the side cavity under strong winds. At the same time, if the side cavity is deflated, the tension of the branch cable can be adjusted to flexibly adjust the stress state of the side cavity, pull the side cavity close to the main cavity, thereby reducing wind resistance and allowing the wind to pass through the column more smoothly.

[0020] Optionally, the buckle assembly includes a male buckle and a female buckle. The male buckle is fixed to the column, and the female buckle is fixed to the outer wall of the main cavity. The female buckle and the male buckle are snapped together and fixed.

[0021] By adopting the above technical solution, the snap-fit ​​between the male and female buckles enables a quick and detachable connection between the air rib wall and the column. The operation is simple, ensuring the stability of the connection and facilitating the quick assembly and disassembly of the air rib wall according to the working conditions during construction, such as wind resistance adjustment and maintenance, thus improving construction flexibility.

[0022] Optionally, an adjustable support is provided below the base. The adjustable support includes an upper seat, a lower seat, and an adjusting rod. The upper seat and the lower seat are ball-jointed. Four adjusting rods are provided and distributed around the upper seat. The adjusting rods are telescopic rods. The top of the adjusting rod is hinged to the upper seat, and the bottom of the adjusting rod is hinged to the lower seat.

[0023] By adopting the above technical solution, the ball joint upper seat and base, together with the surrounding telescopic rod adjustment rods, can flexibly adjust the level of the upper seat, so that the column can remain vertical in construction sites with different terrains, ensuring the installation accuracy and support stability of the steel structure, and improving the adaptability of the equipment to complex construction environments.

[0024] Secondly, this application provides a method for using a membrane structure shed for foundation pit construction, employing the following technical solution: A method for using a membrane structure shed for foundation pit construction includes the following steps: S1. Assemble the main steel structure: Arrange multiple bases at intervals along the edge of the foundation pit, adjust the level of the upper base by adjusting the supports, fix the columns and bases, and the beams and columns, so that the adjacent beams are connected end to end. S2. Install the top air-supported membrane: Fix the top air-supported membrane to the top of the crossbeam; S3. Install the air rib wall: Insert the side cavity into the column through groove and inflate it. After the main cavity is inflated, it is pressed against the column and fixed by the buckle assembly. Then fix the cable and branch cable. S4. Unfolding the strip film: Start the motor to drive the screw, which moves the slider, connecting rod and strip film. The gear and rack mesh to ensure smooth unfolding. S5. Wind resistance adjustment: When the wind force increases, release air from the opposite cavity or disassemble part of the air rib wall to adjust the tension of the cable.

[0025] By adopting the above technical solution, the usage method is simple and logically clear, and is precisely adapted to the structural design of the membrane structure shed. Through step-by-step assembly, installation and adjustment, the equipment can be quickly built and put into use. The wind resistance adjustment step can be flexibly adjusted according to the actual wind conditions, effectively improving the adaptability to different wind environments. At the same time, the whole process operation takes into account both construction efficiency and usage stability, and realizes dust and noise control and safety protection throughout the entire stage of foundation pit construction.

[0026] In summary, this application includes at least one of the following beneficial technical effects: Breaking through construction phase limitations and achieving full-process adaptability: Through the high-level support design of the main steel structure, the problem that traditional air-ribbed air-supported membrane structures cannot adapt to tower crane operations during the foundation pit backfilling stage due to insufficient height is completely solved. It can cover the entire construction process of excavation and backfilling, greatly improving the versatility of membrane structure sheds. Significantly improved wind resistance, adaptable to complex environments: With the stable support of the main steel structure, the independent inflation and deflation design of the air rib wall, and the traction and fixation of the cables and branch cables, multiple wind resistance guarantees are formed, breaking through the wind resistance limit of traditional air rib air membrane of level 7-9. The structural state can be flexibly adjusted according to the wind force to adapt to more severe wind environments. Flexible and efficient installation with outstanding green protection: The adjustable supports are adaptable to different terrains, and the air rib wall and strip membrane components are easy to assemble and disassemble and unfold. At the same time, the fully enclosed structure design continues the advantages of green construction, effectively controlling dust and noise pollution, and taking into account both construction efficiency and environmental safety. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a partial structural diagram of a single-sided air-ribbed wall; Figure 3 This is a partial structural diagram of the location of the side cavity and the through groove; Figure 4 yes Figure 2 A magnified view of part A in the middle, with the first corrugated cover hidden; Figure 5 It is a cross-sectional view showing the positions of the gear and rack.

[0028] Explanation of reference numerals in the attached drawings: 1. Main steel structure; 11. Base; 12. Column; 13. Horizontal beam; 14. Upper slide groove; 15. Lower slide groove; 16. Rack; 17. Pad; 18. First corrugated cover; 19. Second corrugated cover; 2. Top air membrane; 3. Air rib wall; 31. Main cavity; 32. Side cavity; 4. Through groove; 5. Buckle assembly; 51. Female buckle; 52. Female buckle; 6. Strip membrane assembly; 61. Motor; 62. Screw; 63. Slider; 64. Strip membrane; 65. Connecting rod; 7. Gear; 8. Cable; 81. Branch cable; 9. Adjusting support; 91. Upper seat; 92. Lower seat; 93. Adjusting rod. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0030] This application discloses a membrane structure shed for foundation pit construction, which aims to solve the problem that traditional air-ribbed membrane structures can only be used in the early stage of foundation pit construction and have poor wind resistance, so as to achieve full-process construction coverage and improved wind resistance performance.

[0031] refer to Figure 1 , Figure 2 and Figure 3 A membrane structure shed for foundation pit construction includes a steel main body 1, a top air-supported membrane 2, and air-supported rib walls 3. The steel main body 1 serves as the core supporting component, providing the installation foundation and stable support for the top air-supported membrane 2 and air-supported rib walls 3. It includes multiple bases 11, columns 12, and crossbeams 13. The bases 11 are spaced apart along the edge of the foundation pit to ensure uniform support for the overall structure. The columns 12 are vertically fixed above each base 11 and adopt a truss structure design, which effectively reduces their own weight and reduces the foundation bearing pressure while ensuring support strength. The crossbeams 13 are also truss structures, fixed to the top of the columns 12. Adjacent crossbeams 13 are connected end to end to form a closed support frame around the top of the foundation pit, providing an installation carrier for the top air-supported membrane 2.

[0032] refer to Figure 1 and Figure 2The top air membrane 2 is made of high-strength, dust-proof membrane material and is fixed to the top of the crossbeam 13. Through the high-level support frame formed by the crossbeam 13, the installation height of the top air membrane 2 is significantly increased, which fully meets the space requirements of tower crane operation during the foundation pit backfilling stage and completely breaks the height limitation of traditional air rib air membrane.

[0033] refer to Figure 2 and Figure 3 The air-ribbed wall 3 is installed between adjacent columns 12 to seal the sides of the foundation pit. It includes a main cavity 31 and two side cavities 32. The two side cavities 32 are symmetrically distributed on both sides of the main cavity 31 and are integrally formed and fixedly connected to the main cavity 31. Both the side cavities 32 and the main cavity 31 are made of independently inflatable and deflated sealing membrane material, and the inflation state can be flexibly adjusted according to the construction conditions. Correspondingly, a through groove 4 is opened on the column 12 along its length direction. The side cavities 32 are inserted into the through groove 4 to achieve the initial positioning of the air-ribbed wall 3 and the column 12. After the main cavity 31 is inflated, it will tightly abut against the outer wall of the column 12, further enhancing the fit and sealing of the air-ribbed wall 3 and the column 12, and improving the dust and noise blocking effect.

[0034] refer to Figure 2 and Figure 3 To enable the air rib wall 3 to be detachably fixed to the column 12, a snap-fit ​​assembly 5 is provided between the main cavity 31 and the column 12. The snap-fit ​​assembly 5 includes a male snap 51 and a female snap 52. The male snap 51 is fixed to the outer wall of the column 12, and the female snap 52 is fixed to the corresponding position of the main cavity 31. Through the snap-fit ​​cooperation of the male snap 51 and the female snap 52, the fixing and disassembly of the air rib wall 3 can be completed quickly. The operation is simple and efficient, and it is convenient for maintenance and wind resistance adjustment during the construction process.

[0035] refer to Figure 2 , Figure 4 and Figure 5To further enhance the sealing effect at the top of the foundation pit, a sliding groove 15 and an upper sliding groove 14 are fixed on the outer wall of the crossbeam 13. Both the sliding groove 15 and the upper sliding groove 14 extend along the length of the crossbeam 13. A strip membrane assembly 6 is also installed on the crossbeam 13 to seal the gap between adjacent crossbeams 13 or between the crossbeam 13 and the top air membrane 2. The strip membrane assembly 6 includes a motor 61, a screw 62, a slider 63, a strip membrane 64, and a connecting rod 65. The motor 61 is fixed to the outer wall of the end of the sliding groove 15, and its output end is fixedly connected to one end of the screw 62. The screw 62 is rotatably disposed inside the sliding groove 15 and arranged along the length of the sliding groove 15. The slider 63 is slidably disposed inside the sliding groove 15. The screw 62 passes through the slider 63 and is threadedly connected to the slider 63. One end of the connecting rod 65 is fixedly connected to the slider 63, and the other end is fixed to one end of the strip membrane 64. By driving the screw 62 to rotate through the motor 61, the slider 63 can be driven to slide along the sliding groove 15. In turn, the connecting rod 65 pulls the strip membrane 64 to unfold or retract, realizing automated operation without manual intervention and improving construction efficiency.

[0036] refer to Figure 2 , Figure 4 and Figure 5 A rack 16 extending along its length is fixed inside the upper slide groove 14. A gear 7 is fixed at the end of the connecting rod 65 away from the slider 63. The gear 7 meshes with the rack 16. When the slider 63 moves the connecting rod 65, the gear 7 rolls along the rack 16, providing stable guidance and rotational force for the connecting rod 65, ensuring that the strip film 64 is wound or released during movement. A pad 17 is also slidably disposed on the upper slide groove 14. The pad 17 can slide along the length of the upper slide groove 14. The connecting rod 65 passes through the pad 17 and can rotate relative to the pad 17. The pad 17 supports the connecting rod 65, reducing the deformation of the connecting rod 65 caused by force and ensuring transmission stability. A first corrugated cover 18 is provided on the sliding groove 15. One end of the first corrugated cover 18 is fixed to the slider 63, and the other end is fixed to the outer wall of the sliding groove 15, which is used to cover the interior of the sliding groove 15. A second corrugated cover 19 is provided on the upper sliding groove 14. One end of the second corrugated cover 19 is fixed to the pad 17, and the other end is fixed to the outer wall of the upper sliding groove 14, which is used to cover the interior of the upper sliding groove 14. Through the first corrugated cover 18 and the second corrugated cover 19, dust and debris can be effectively prevented from entering the interior of the sliding groove during construction, and components such as the screw 62 and rack 16 can be prevented from getting stuck or damaged, thus extending the service life of the equipment and further improving the sealing performance of the structure.

[0037] refer to Figure 2 and Figure 3To enhance the wind resistance stability of the air rib wall 3, a cable 8 is also installed on the air rib wall 3. One end of the cable 8 is fixedly connected to the outer wall of the main cavity 31, and the other end is fixed to the ground outside the air rib wall 3 by means of ground anchors and other components, forming an oblique tensile support to share the wind load borne by the air rib wall 3 and prevent the air rib wall 3 from tilting or shifting under strong winds. A branch cable 81 is also provided on the cable 8. One end of the branch cable 81 is fixed to the cable 8, and the other end is fixed to the outer wall of the side cavity 32. When the branch cable 81 is pulled in a direction away from the main cavity 31, the branch cable 81 will pull the side cavity 32 closer to the main cavity 31, thereby enhancing the tightness of the fit between the side cavity 32 and the through groove 4 of the column 12. When the wind force is large, the side cavity 32 can be vented, and then the tension of the branch cable 81 can be adjusted to pull the side cavity 32 closer to the main cavity 31, thereby reducing wind resistance and allowing the airflow to pass more smoothly through the gap between the columns 12, thereby further improving the wind resistance performance.

[0038] refer to Figure 2 An adjustable support 9 is provided below the base 11 to adapt to different construction sites and ensure that the column 12 remains vertical. The adjustable support 9 includes an upper seat 91, a lower seat 92, and four adjusting rods 93. The upper seat 91 and the lower seat 92 are connected by a ball joint. The four adjusting rods 93 are distributed around the upper seat 91. The adjusting rods 93 adopt a telescopic rod structure, with their top ends hinged to the upper seat 91 and their bottom ends hinged to the lower seat 92. In this embodiment, the hinges between the ends of the adjusting rods 93 and the upper seat 91 and the lower seat 92 are both ball joints. By adjusting the telescopic length of the four adjusting rods 93, the levelness of the upper seat 91 can be flexibly adjusted. Even if the construction site is uneven, the column 12 can be kept vertical by adjusting the support 9, ensuring the installation accuracy and support stability of the steel structure body 1, and improving the adaptability of the equipment to complex construction environments.

[0039] This application also discloses a method for using a membrane structure shed for foundation pit construction.

[0040] Includes the following steps: S1. Assemble the main steel structure: First, according to the size and shape of the foundation pit, arrange multiple bases 11 evenly at intervals along the edge of the foundation pit. Install an adjustable support 9 under each base 11. By adjusting the extension length of the four adjusting rods 93 of the adjustable support 9, keep the upper seat 91 horizontal, thereby ensuring the vertical installation of the subsequent columns 12. Then, fix the columns 12 vertically on the upper seat 91 of the base 11, and then fix the crossbeams 13 to the top of the columns 12 in sequence, so that the adjacent crossbeams 13 are connected end to end to form a closed frame, thus completing the assembly of the main steel structure 1.

[0041] S2. Install the top air membrane: Cover the top of the closed frame formed by the crossbeam 13 with the prefabricated top air membrane 2, and use bolts, pressure strips and other fixing methods to firmly fix the edge of the top air membrane 2 to the crossbeam 13, ensuring that the top air membrane 2 is flat and taut, so as to achieve a closed cover of the top of the foundation pit.

[0042] S3. Install the air rib wall: Align the two side cavities 32 of the air rib wall 3 with the through slots 4 on the adjacent columns 12, insert the side cavities 32 into the through slots 4, and then inflate the side cavities 32 to expand them, thus achieving initial fixation of the air rib wall 3; next, inflate the main cavity 31, so that the main cavity 31 expands and fits tightly against the outer wall of the column 12, and then snap the female buckle 52 and the male buckle 51 of the buckle assembly 5 to complete the stable connection between the air rib wall 3 and the column 12; finally, fix the end of the cable 8 away from the main cavity 31 to the ground outside the air rib wall 3 with a ground anchor, and fix the branch cable 81 to the outer wall of the side cavity 32, and adjust the tension of the cable 8 and the branch cable 81 to ensure the stability of the air rib wall 3.

[0043] S4. Unfolding the strip membrane 64: Start the motor 61 at the end of the lower slide groove 15. The motor 61 drives the screw 62 to rotate. The screw 62 drives the slider 63, which is threaded to it, to slide along the length of the lower slide groove 15. The slider 63 pulls the strip membrane 64 to move through the connecting rod 65. During this process, the gear 7 at the end of the connecting rod 65 meshes and rolls with the rack 16 in the upper slide groove 14 to ensure that the strip membrane 64 unfolds smoothly. At the same time, the pad 17 slides along the upper slide groove 14 with the connecting rod 65. The first corrugated cover 18 and the second corrugated cover 19 extend synchronously to cover the interior of the lower slide groove 15 and the upper slide groove 14 until the strip membrane 64 is fully unfolded and the gap between the adjacent crossbeams 13 is closed.

[0044] S5. Wind Resistance Adjustment: If the wind force increases during construction, the wind resistance can be flexibly adjusted according to the actual wind force level. When the wind force is low, only the side cavity 32 is vented, so that the side cavity 32 contracts and separates from the tight contact with the through groove 4, forming a ventilation channel and reducing the wind load. When the wind force is high, some non-critical air rib walls 3 can be disassembled through the buckle assembly 5 to further reduce wind resistance. At the same time, the tension of the cable 8 and the branch cable 81 can be adjusted to enhance the wind resistance stability of the structure through the oblique tension, ensuring that the membrane structure can still be used safely in strong wind environments.

[0045] After construction is completed, disassembly and storage can be carried out in the reverse order of installation: first, remove the fixing of the cable 8 to the ground, separate the male buckle 51 and female buckle 52 of the buckle assembly 5, release the air from the main cavity 31 and the side cavity 32, and remove the air rib wall 3 from the through groove 4 of the column 12; then start the motor 61 in reverse to retract the diaphragm 64; finally, disassemble the crossbeam 13, column 12, base 11 and adjusting support 9 in sequence to complete the storage of the equipment for subsequent reuse.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A membrane structure shed for foundation pit construction, characterized in that: The structure includes a steel main body (1), a top air-supported membrane (2), and an air-supported rib wall (3). The steel main body (1) includes a base (11), columns (12), and beams (13). The columns (12) are fixed on the base (11), and the beams (13) are fixed on the top of the columns (12). Multiple bases (11), columns (12), and beams (13) are provided. Adjacent columns (12) are spaced apart along the edge of the pit, and adjacent beams (13) are connected end to end. The top air-supported membrane (2) is fixed on the beams (13). The top of the air rib wall (3) includes a main cavity (31) and a side cavity (32). There are two side cavities (32) and they are symmetrically distributed on both sides of the main cavity (31). The side cavity (32) is fixedly connected to the main cavity (31). A through groove (4) is opened on the column (12). The through groove (4) is opened along the length of the column (12). The side cavity (32) is inserted into the through groove (4). A buckle assembly (5) for detachable connection between the main cavity (31) and the column (12) is provided.

2. The membrane structure shed for foundation pit construction according to claim 1, characterized in that: The column (12) is a truss structure, and the side cavity (32) and the main cavity (31) can be independently inflated and deflated; when the main cavity (31) is inflated, the main cavity (31) is pressed against the outer wall of the column (12).

3. The membrane structure shed for foundation pit construction according to claim 1, characterized in that: The crossbeam (13) is a truss structure. A lower sliding groove (15) and an upper sliding groove (14) are fixed on the outer wall of the crossbeam (13). Both the lower sliding groove (15) and the upper sliding groove (14) are arranged along the length of the crossbeam (13). A strip membrane assembly (6) is arranged on the crossbeam (13). The strip membrane assembly (6) includes a motor (61), a screw (62), a slider (63), a strip membrane (64), and a connecting rod (65). The motor (61) is fixed to the outer wall of the end of the lower sliding groove (15). The output end of the motor (61) is fixed to one end of the screw (62). The screw (62) is rotatably set inside the sliding groove (15) and is set along the length direction of the sliding groove (15). The screw (62) passes through the slider (63) and is threadedly connected to the slider (63). The slider (63) is slidably set inside the sliding groove (15) and slides along the length direction of the sliding groove (15). One end of the connecting rod (65) is fixedly connected to the slider (63), and one end of the connecting rod (65) is fixed to the strip membrane (64).

4. A membrane structure shed for foundation pit construction according to claim 3, characterized in that: A rack (16) is fixed inside the upper slide groove (14). The rack (16) is arranged along the length direction of the upper slide groove (14). A gear (7) is fixed at the end of the connecting rod (65) away from the slider (63). The gear (7) meshes with the rack (16).

5. A membrane structure shed for foundation pit construction according to claim 4, characterized in that: A pad (17) is slidably disposed on the upper slide groove (14). The pad (17) slides along the length direction of the upper slide groove (14). A connecting rod (65) passes through the pad (17) and rotates relative to the pad (17). A first corrugated cover (18) is disposed on the lower slide groove (15). One end of the first corrugated cover (18) is fixed to the slider (63), and the other end is fixed to the outer wall of the lower slide groove (15). The first corrugated cover (18) is used to cover the inside of the lower slide groove (15). A second corrugated cover (19) is disposed on the upper slide groove (14). One end of the second corrugated cover (19) is fixed to the pad (17), and the other end is fixed to the outer wall of the upper slide groove (14). The second corrugated cover (19) is used to cover the inside of the upper slide groove (14).

6. A membrane structure shed for foundation pit construction according to claim 2, characterized in that: A cable (8) is provided on the air rib wall (3). One end of the cable (8) is fixed to the outer wall of the main cavity (31), and the other end is used to be inserted and fixed to the ground outside the air rib wall (3).

7. A membrane structure shed for foundation pit construction according to claim 6, characterized in that: A branch cable (81) is provided on the cable (8). One end of the branch cable (81) is fixed to the cable (8), and the other end is fixed to the outer wall of the side cavity (32). When the branch cable (81) is pulled in a direction away from the main cavity (31), the branch cable (81) pulls the side cavity (32) closer to the main cavity (31).

8. A membrane structure shed for foundation pit construction according to claim 1, characterized in that: The buckle assembly (5) includes a male buckle (51) and a female buckle (52). The male buckle (51) is fixed to the column (12), and the female buckle (52) is fixed to the outer wall of the main cavity (31). The female buckle (52) and the male buckle (51) are snapped together and fixed.

9. A membrane structure shed for foundation pit construction according to claim 4, characterized in that: An adjustable support (9) is provided below the base (11). The adjustable support includes an upper seat (91), a lower seat (92), and an adjusting rod (93). The upper seat (91) and the lower seat (92) are ball-jointed. There are four adjusting rods (93) distributed around the upper seat (91). The adjusting rod (93) is a telescopic rod. The top end of the adjusting rod (93) is hinged to the upper seat (91), and the bottom end of the adjusting rod (93) is hinged to the lower seat (92).

10. The method of using a membrane structure shed for foundation pit construction as described in claim 9, characterized in that: Includes the following steps: S1. Assemble the main steel structure (1): Arrange multiple bases (11) at intervals along the edge of the foundation pit, adjust the level of the upper base (91) by adjusting the support (9), fix the column (12) to the base (11) and the crossbeam (13) to the column (12), so that the adjacent crossbeams (13) are connected end to end. S2, Install the top air membrane (2): Fix the top air membrane (2) to the top of the crossbeam (13); S3. Install the air rib wall (3): Insert the side cavity (32) into the through groove (4) of the column (12) and inflate it. After the main cavity (31) is inflated, it is pressed against the column (12) and fixed by the buckle assembly (5). Then fix the cable (8) and branch cable (81). S4, Unfold the strip film (64): Start the motor (61) to drive the screw (62), which in turn moves the slider (63), connecting rod (65) and strip film (64). The gear (7) meshes with the rack (16) to ensure smooth unfolding. S5, wind resistance adjustment: when the wind force increases, the opposite cavity (32) is vented or part of the air rib wall (3) is disassembled.

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