Foundation pit operation air film structure

Abstract

This utility model relates to an air-supported membrane structure for foundation pit operations. Addressing the challenge of covering irregularly shaped foundation pits, it proposes a modular combination solution: linear and arc-shaped air-supported membrane sections are quickly connected via a magnetic attraction system to form complex covering structures such as L-shapes and T-shapes. The bottom of the linear sections integrates a sliding rail fixing mechanism, allowing for sliding adjustment along the rail during construction and locking with screws after positioning. The arc-shaped sections are anchored to pre-embedded parts using double-arc plates to ensure corner sealing. The air-supported membrane sections are attracted to each other via alternating permanent magnets and electromagnetic units, with EPDM sealing tape applied at the joints. This design significantly improves installation efficiency and adaptability, supports dynamic adjustment and rapid recovery, and is suitable for diverse foundation pit engineering scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit construction, specifically relating to an air-supported membrane structure for foundation pit operations. Background Technology

[0002] Traditional foundation pit covering structures often employ fixed rigid covers or simple canvas, which are ill-suited for the complex boundaries of irregularly shaped foundation pits (such as L-shaped and T-shaped ones), resulting in problems such as poor joint sealing, low installation efficiency, and difficulties in recycling. Especially for corners or curved boundaries, existing technologies require custom-made components, leading to extended construction periods and increased costs. Furthermore, conventional fixing methods rely on on-site welding or bolting, lacking sufficient adjustment flexibility and affecting the overall airtightness and reusability of the air-supported membrane system. Therefore, a modular, dynamically adjustable, and rapidly detachable foundation pit covering solution is urgently needed. Utility Model Content

[0003] The purpose of this invention is to provide an air-supported membrane structure for foundation pit operations to solve the problems existing in the prior art. To achieve the above-mentioned objective, the technical solution adopted by this invention is as follows:

[0004] An air-supported membrane structure for foundation pit operations includes several linear air-supported membrane segment groups, several arc-shaped air-supported membrane segment groups, a first fixing member, and a second fixing member. The arc-shaped air-supported membrane segment groups are connected between two of the linear air-supported membrane segment groups. Each linear air-supported membrane segment group includes several sequentially connected linear air-supported membrane segments, and each arc-shaped air-supported membrane segment group includes several sequentially connected arc-shaped air-supported membrane segments. The linear air-supported membrane segments are fixed to the ground by the first fixing member, and the arc-shaped air-supported membrane segments are fixed to the ground by the second fixing member. The structure includes at least one linear air-supported membrane segment group, and each linear air-supported membrane segment group includes at least one linear air-supported membrane segment.

[0005] Furthermore, the first fixing member includes a base plate and a slide rail. A sliding strip is provided on each side of the base plate along the length direction, and a slide groove is provided on each side of the top of the slide rail along the length direction. The sliding strip slides in the slide groove, and the bottom of the base plate slides in the top of the slide rail.

[0006] Furthermore, the top center of the slide rail has several countersunk holes arranged in an array along its length, and a first screw is provided in each countersunk hole. The first screw is threadedly connected to a first embedded part set in the ground.

[0007] Furthermore, the slide groove has a plurality of threaded through holes arranged along its length, and the sliding bar has a plurality of first threaded connection holes arranged along its length. The threaded through holes and the first threaded connection holes are internally threadedly connected to a third screw that fixes the two relative to each other.

[0008] Furthermore, a base plate is fixedly provided at the bottom of both ends of the linear air film section.

[0009] Furthermore, the second fixing component includes a first arc-shaped plate, a second screw, a second embedded part, and a second arc-shaped plate. The top inner and outer sides of the first arc-shaped plate and the second arc-shaped plate are respectively arranged with a plurality of second threaded connection holes. The second screw is provided in the second threaded connection hole, and the second screw is threadedly connected to the second embedded part set in the ground.

[0010] Furthermore, the top of the first arc-shaped plate is fixedly connected to one end of the arc-shaped air film section between the two rows of second threaded connection holes, and the top of the second arc-shaped plate is fixedly connected to the other end of the arc-shaped air film section between the two rows of second threaded connection holes.

[0011] Furthermore, a plurality of connecting magnets are arranged along the circumference of the air film on both sides of the linear air film segment and the arc-shaped air film segment. Each connecting magnet includes a first magnetic pole and a second magnetic pole, and the first magnetic pole and the second magnetic pole are respectively disposed on both sides of the same linear air film segment or the arc-shaped air film segment.

[0012] This utility model has the following beneficial effects:

[0013] Modular and flexible combination: By freely splicing linear and curved air-supported membrane sections, it can adapt to irregularly shaped foundation pits such as L-shaped and T-shaped ones. The length of the linear section can be customized according to the module, and the curvature radius of the curved section is dynamically adjustable (3-15m), significantly improving the coverage adaptability to complex terrain.

[0014] Efficient installation and precise positioning: The sliding rail system allows linear sections to slide and adjust along the track during construction. Magnetic connection replaces traditional bolt fastening. Adjacent sections are automatically attracted by permanent magnets with N / S poles arranged alternately and electromagnetic units. EPDM sealing tape is pre-applied at the joints, improving installation efficiency and ensuring airtightness.

[0015] Stable anchoring and adjustable fixing: The linear section adopts a sliding locking mechanism of slide rail-base plate, and the modular array of countersunk holes matches the embedded parts, which are dynamically locked by the third screw; the arc section is circumferentially anchored by double arc plates, and the embedded parts adopt a cross rib plate anchor bolt structure to improve pull-out resistance.

[0016] Green and recyclable design: The electromagnetic hybrid magnetic attraction system (permanent magnet + controllable electromagnet) supports remote power-off decoupling. Combined with detachable embedded parts, it enables rapid disassembly and reuse of modules, reducing construction costs and resource consumption. Attached Figure Description

[0017] Figure 1 This is an exploded view of the present invention;

[0018] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is an exploded view of the arc-shaped air film section and the second component. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0021] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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. Therefore, they should not be construed as limitations on this utility model.

[0022] like Figure 1-3 As shown, an air-supported membrane structure for foundation pit operations includes several linear air-supported membrane segment groups, several arc-shaped air-supported membrane segment groups, a first fixing member 3, and a second fixing member. The arc-shaped air-supported membrane segment groups are connected between two of the linear air-supported membrane segment groups. Each linear air-supported membrane segment group includes several sequentially connected linear air-supported membrane segments 1, and each arc-shaped air-supported membrane segment group includes several sequentially connected arc-shaped air-supported membrane segments 2. The linear air-supported membrane segments 1 are fixed to the ground by the first fixing member 3, and the arc-shaped air-supported membrane segments 2 are fixed to the ground by the second fixing member. At least one linear air-supported membrane segment group is included, and each linear air-supported membrane segment group includes at least one linear air-supported membrane segment 1. Linear air-supported membrane section 1: This constitutes the main unit for the straight-edge coverage of the foundation pit. The length is customized according to the module (e.g., 6m / section), and the bottom integrates the first fixing component 3 for fixation. Arc-shaped air-supported membrane section 2: This is used to connect corners or curved boundaries. The radius of curvature is adjustable (R = 3-15m, customized according to specific conditions). The bottom is connected to the second fixing component for fixation. Combination rule: Two linear air-supported membrane sections are connected by arc-shaped air-supported membrane sections to form L-shaped, T-shaped, and other irregular foundation pit coverage structures.

[0023] like Figure 2As shown, the first fixing member 3 includes a base plate 310 and a slide rail 301. A sliding strip 309 is provided on each side of the base plate 310 along its length. A slide groove 302 is provided on each side of the top of the slide rail 301 along its length. The sliding strips 309 slide in contact with the slide grooves 302. The bottom of the base plate 310 slides in contact with the top of the slide rail 301. Several countersunk holes 307 are arranged along the length of the top center of the slide rail 301. A first screw 306 is provided within each countersunk hole 307 and is threadedly connected to a first embedded part 303 located underground. Several threaded through holes 304 are arranged along the length of the slide groove 302, penetrating both sides of the slide groove 302. Several first threaded connecting holes 308 are arranged along the length of the sliding strip 309. A third screw 305 is threadedly connected to the threaded through holes 304 and the first threaded connecting holes 308, fixing them relative to each other. The bottom of both ends of the linear air-film section 1 is fixedly provided with a base plate 310. For the slide rail 301: the top two sides are provided with sliding grooves 302 (H7 / g6 clearance fit, tolerance 0.02-0.05mm), which dynamically engage with the sliding strips 309 of the base plate 310; during the construction stage, the sliding strips 309 are not locked temporarily, allowing the linear section to slide and adjust along the slide rail, and after positioning, they are locked by the third screw 305. For the base plate 310: the bottom is in sliding fit with the slide rail 301, and the top is fixed to both ends of the linear air-film section 1; the countersunk holes 307 are arrayed in a 500mm module, and are matched with the M20 first screw 306 to connect to the underground embedded parts 303 (depth ≥1.2m). The first and second embedded parts can adopt a cross-ribbed anchor structure, including: a central screw rod: made of M20 high-strength alloy steel with hot-dip galvanized surface for rust prevention; expansion ribs: four symmetrically distributed inverted conical ribs (inclination angle can be 15°), with shear keys at the ends of the ribs; the spaces between the ribs are filled with non-shrink epoxy mortar, and the inverted conical ribs increase the contact area with concrete, thus improving the pull-out resistance compared to straight rods.

[0024] like Figure 3 As shown, the second fixing component includes a first arc-shaped plate 201, a second screw 202, a second embedded part 204, and a second arc-shaped plate 205. The first arc-shaped plate 201 and the second arc-shaped plate 205 have a plurality of second threaded connection holes 203 arranged circumferentially on their top inner and outer sides. The second screw 202 is disposed within each of the second threaded connection holes 203, and the second screw 202 is threadedly connected to the second embedded part located underground. The top of the first arc-shaped plate 201 is fixedly connected to one end of the arc-shaped air film section 2 between two rows of second threaded connection holes 203, and the top of the second arc-shaped plate 205 is fixedly connected to the other end of the arc-shaped air film section 2 between two rows of second threaded connection holes 203. The second fixing component is used to fix the arc-shaped air film section 2 to the ground. The structure of the second embedded part is described in the preceding text.

[0025] The linear air film section 1 and the arc-shaped air film section 2 are arranged with several connecting magnets along the circumference of the air film on both sides. Each connecting magnet includes a first magnetic pole and a second magnetic pole, which are respectively located on both sides of the same linear air film section 1 or arc-shaped air film section 2. Neodymium iron boron permanent magnets (N52 grade) are arranged circumferentially on both sides of the linear / arc section, with adjacent sections having alternating N / S pole arrangements. EPDM sealing tape is pre-applied to the inner side to form redundant protection. Furthermore, due to the modular assembly design of the linear and arc-shaped air film sections, this device is easier to recycle and reuse. Therefore, for ease of recycling, a hybrid magnetic attraction system design can be adopted for the magnetic attraction system. The first magnetic pole uses an electromagnetic unit: a waterproof electromagnet embedded in the center of the magnetic attraction surface, and the second magnetic pole uses a permanent magnet unit: neodymium iron boron permanent magnets are arranged around the electromagnet. The on / off state of each electromagnet is remotely controlled by a central control module.

[0026] Installation Process (taking an L-shaped foundation pit as an example): Step 1: Prioritize anchoring the arc-shaped section: Measure the apex of the foundation pit corner and pre-embed the second embedded part 204 (1.5m spacing); hoist the arc-shaped air-supported membrane section 2, aligning the first / second arc-shaped plates (201, 205) with the embedded parts; screw in the second screw 202. Step 2: Dynamically splice the linear section slide rail: Lay the slide rail 301 along the straight edge and fix it with the first screw 306 (horizontal error ≤3mm / m); insert the sliding strip 309 of the linear section 1 into the slide rail 301, and push the module to slide until it magnetically connects with the arc-shaped section; after checking the airtightness of the joint, tighten the third screw 305. In actual work, the arc-shaped section is installed first to avoid the linear section from obstructing positioning; the slide rail system makes the adjustment time of the linear section <5min / section, and the magnetic connection shortens the working time by 80% compared with bolts.

[0027] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications, alterations, alterations, or substitutions made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A gas membrane structure for a foundation pit operation, characterized by: It includes several linear air film segment groups, several arc-shaped air film segment groups, a first fixing member (3) and a second fixing member. The arc-shaped air film segment groups are connected between two linear air film segment groups. The linear air film segment group includes several linear air film segments (1) connected in sequence. The arc-shaped air film segment group includes several arc-shaped air film segments (2) connected in sequence. The linear air film segment (1) is fixed to the ground by the first fixing member (3). The arc-shaped air film segment (2) is fixed to the ground by the second fixing member. It includes at least one linear air film segment group. The linear air film segment group includes at least one linear air film segment (1).

2. The pneumatic membrane structure for foundation pit operation according to claim 1, characterized in that: The first fixing member (3) includes a base plate (310) and a slide rail (301). A sliding strip (309) is provided on both sides of the base plate (310) along the length direction. A slide groove (302) is provided on both sides of the top of the slide rail (301) along the length direction. The sliding strip (309) slides in the slide groove (302). The bottom of the base plate (310) slides in the top of the slide rail (301).

3. The pneumatic membrane structure for foundation pit operation according to claim 2, characterized in that: The slide rail (301) has a plurality of countersunk holes (307) arranged along the length direction at the top center. A first screw (306) is provided in the countersunk hole (307), and the first screw (306) is threadedly connected to a first embedded part (303) set in the ground.

4. The gas film structure for foundation pit operation according to claim 2, characterized in that: The slide groove (302) has a plurality of threaded through holes (304) extending through both sides of the slide groove (302) along its length direction. The sliding bar (309) has a plurality of first threaded connection holes (308) arranged along its length direction. The threaded through holes (304) and the first threaded connection holes (308) are internally threaded with a third screw (305) that fixes the two relatively.

5. The pneumatic membrane structure for foundation pit operation according to claim 2, characterized in that: The bottom of both ends of the linear air film section (1) is fixedly provided with a base plate (310).

6. The pneumatic membrane structure for foundation pit operation according to claim 1, characterized in that: The second fixing component includes a first arc-shaped plate (201), a second screw (202), a second embedded part (204), and a second arc-shaped plate (205). The top inner and outer sides of the first arc-shaped plate (201) and the second arc-shaped plate (205) are respectively arranged with a plurality of second threaded connection holes (203). The second screw (202) is provided in the second threaded connection hole (203), and the second screw (202) is threadedly connected to the second embedded part set in the ground.

7. The pneumatic membrane structure for foundation pit operation according to claim 6, characterized in that: The top of the first arc-shaped plate (201) is fixedly connected to one end of the arc-shaped air film section (2) between two rows of second threaded connection holes (203), and the top of the second arc-shaped plate (205) is fixedly connected to the other end of the arc-shaped air film section (2) between two rows of second threaded connection holes (203).

8. The gas film structure for foundation pit operation according to claim 1, characterized in that: The linear air film section (1) and the arc-shaped air film section (2) are arranged with several connecting magnets along the circumference of the air film on both sides. The connecting magnets include a first magnetic pole and a second magnetic pole. The first magnetic pole and the second magnetic pole are respectively arranged on both sides of the same linear air film section (1) or arc-shaped air film section (2).

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