Fabricated foundation pit gas film foundation and construction method thereof

Abstract

The invention discloses a fabricated foundation pit gas film foundation and a construction method thereof. The foundation is composed of a plurality of H-shaped steels which are connected end to end, a clamping mechanism is arranged between every two adjacent H-shaped steels to facilitate rapid splicing, a spiral ground pile is inserted into a through hole of a lower flange plate, and a limiting mechanism and an abutting mechanism are matched to enhance stability. A fixing mechanism is arranged on an upper flange plate of the H-shaped steel to strengthen connection, and the abutting mechanism can be triggered. The upper flange plate is further provided with a connecting mechanism used for fixing the gas film material. During construction, the ground piles are driven, the H-shaped steel is placed and initially connected, then the limiting mechanism, the fixing mechanism and the like are sequentially installed, and finally the gas film is fixed. According to the scheme, the problems that a traditional mode is difficult to assemble, poor in effect, prone to loosening in limiting and the like are solved, efficient assembly and stable connection are achieved, the method is suitable for various foundation pit gas film projects, the foundation stability and reliability are effectively improved, the construction cost is reduced, and the project benefits are improved.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit air film technology, and in particular to an assembled foundation pit air film foundation and a construction method thereof. Background Art

[0002] In the field of modern engineering construction, foundation pit air film foundation is gradually being used as a new foundation form. The foundation pit air film foundation mainly builds an air film structure on the foundation pit, and uses the sealing characteristics of the air film to form a specific space, which can be used for various purposes such as material storage and construction site shielding. It has certain advantages in some temporary engineering scenes or those with special space requirements due to its relatively simple construction, flexible space utilization and good cost-effectiveness.

[0003] There are many shortcomings in the traditional construction method of using H-shaped steel and spiral piles as the foundation of the air membrane. In terms of assembly, the traditional method often lacks an efficient connection structure. The connection between adjacent H-shaped steels mostly relies on simple welding or universal connectors, which makes it difficult to achieve fast, convenient and accurate assembly, and difficult to quickly complete docking under the complex environment of the construction site. In terms of assembly effect, there is a lack of reinforcement structure. It is difficult to ensure the stability of the connection between H-shaped steels by relying solely on conventional connection methods, and it is impossible to effectively cope with complex external forces, such as lateral forces and tensions generated by strong winds and earthquakes. It is easy to cause loose connections or deformation, affecting the stability of the entire air membrane foundation. In addition, the traditional design does not organically combine it with the connection process of the overall structure, making the limiting mechanism easily disturbed by external factors and loosened during long-term use. For example, when affected by ground vibrations, changes in the deadweight of the structure, etc., the limiting effect of the spiral pile is difficult to maintain continuously, thereby reducing the safety and durability of the entire foundation structure.

[0004] Although the basic modules of CN215407778U (air-supported building for quick assembly) can be prefabricated, the connection structure between modules is complex, the module docking and connection operations are cumbersome during assembly, and the efficiency improvement is limited. The air membrane is fixed by internal and external fixings and screw and nut connections, which is inconvenient to install and has limited fastness. For anchoring components such as ground anchors, there is no mechanism for working in coordination with the foundation structure. When resisting complex external loads, the stability is not as good as the design of the present solution that combines spiral ground piles, limit mechanisms and tightening mechanisms, and is prone to problems such as foundation loosening and displacement.

[0005] CN220847675U (A kind of air membrane assembled concrete foundation) This patent prefabricated reinforced concrete is connected by connecting blocks and positioning grooves, with a single structure and a simple anchor fixation method. In long-term use or under complex geological conditions, the anchors are easy to loosen, resulting in foundation instability. In terms of the fixation of the inflatable membrane, it is only through angle irons and rubber pads, lacking a connection mechanism that is tightly combined with the foundation structure as in this solution, and the fixing effect is not good. Summary of the invention

[0006] The present invention aims to provide an assembled foundation pit air film foundation and a construction method thereof, so as to solve the problems of poor assembly connection effect and easy loosening of the limiting mechanism of the ground pile under vibration in the existing assembled foundation pit air film.

[0007] The present invention is achieved through the following technical solutions:

[0008] According to one aspect of the present invention, there is provided an assembled pit air film foundation, comprising a plurality of H-shaped steels connected end to end in sequence, wherein the H-shaped steel is composed of an upper flange plate, a web plate and a lower flange plate, one end of the web plate is connected to the upper flange plate, the other end of the web plate is connected to the lower flange plate, the lower flange plate contacts the ground, and a clamping mechanism is provided between adjacent H-shaped steels; a through hole is provided on the lower flange plate, and a spiral ground pile inserted into the stratum is provided in the through hole; a limiting mechanism for limiting the spiral ground pile is provided on the lower flange plate; a fixing mechanism for making the adjacent upper flange plates abut against each other is provided between the adjacent upper flange plates, and a tightening mechanism is provided on the spiral ground pile; when the fixing mechanism acts, the tightening mechanism can be triggered to tighten the limiting mechanism, thereby increasing the limiting effect of the limiting mechanism on the spiral ground pile.

[0009] Preferably, the clamping mechanism comprises an upper clamping groove, a lower clamping groove, an upper clamping block and a lower clamping block; along the length direction of the H-shaped steel, an upper clamping groove is provided on the upper flange plate at one end of the H-shaped steel, and a lower clamping groove is provided on the lower flange plate; at the other end of the H-shaped steel, an upper clamping block is provided on the upper flange plate, and a lower clamping block is provided on the lower flange plate; the upper clamping groove and the upper clamping block match each other, and the lower clamping groove and the lower clamping block match each other, so as to assemble and connect adjacent H-shaped steels.

[0010] Preferably, the limiting mechanism includes a first clamping block arranged on one side of the spiral ground pile and a second clamping block arranged on the other side of the spiral ground pile, and a first bolt and a first nut are provided between the first clamping block and the second clamping block, and the first bolt and the first nut are used to connect the first clamping block and the second clamping block.

[0011] Preferably, along the length direction of the H-shaped steel, at one end of the H-shaped steel, the upper flange plate is symmetrically provided with a first opening, a guide rail groove is symmetrically provided in the upper flange plate, and a first notch is provided on the web; at the other end of the H-shaped steel, the upper flange plate is symmetrically provided with a second opening, and the web is provided with a second notch; the fixing mechanism includes a movable plate, and sliding rods matching the guide rail grooves are provided on both sides of the movable plate, so that the movable plate can slide along the length direction of the upper flange plate, and a movable groove matching the first notch is provided in the center of the movable plate, so that the sliding of the movable plate is not restricted by the web; positioning grooves matching the first opening and the second opening are also symmetrically provided on the movable plate; the sliding rod is provided with a second gear section on the opposite sides; the first opening and the second opening An internal thread is provided inside, a first rod is provided in the first opening, a first thread section and a first gear section are provided on the first rod, a second rod is provided in the second opening, and a second thread section is provided on the second rod; the first thread section matches the internal thread in the first opening, and the second thread section matches the internal thread in the second opening; the first gear section matches the second gear section; when the first rod is screwed into the first opening, the first gear section can control the sliding of the movable plate through the second gear section during the rotation and descent process, and when the movable plate extends under the second opening, the second rod is screwed into the second opening and enters the positioning groove. At this time, the first rod rotates in the opposite direction to pull the movable plate back, so that the movable groove contacts the second rod, thereby strengthening the connection effect between adjacent H-shaped steels.

[0012] Preferably, along the insertion direction of the spiral ground pile, a cavity is provided inside the spiral ground pile, and the side walls of the spiral ground pile are symmetrically provided with through holes connecting the cavity with the outside world; the tightening mechanism comprises a bearing plate arranged at the upper end of the spiral ground pile, and a wedge block is provided on the bearing plate, which penetrates the spiral ground pile and extends into the cavity; two moving blocks matching the through holes are provided in the cavity, and the two moving blocks can be pushed by the wedge blocks to extend out of the through holes and tighten against the fixing mechanism, and a reset mechanism is provided between the wedge blocks and the upper wall of the cavity; when the first rod is screwed into the first opening, the end of the first rod contacts and applies force to the bearing plate, pushing the wedge block to make the moving block extend out of the through hole and tighten against the limiting mechanism.

[0013] Preferably, the reset mechanism includes a connecting block and a spring, the connecting block is arranged on the wedge block, the spring is arranged between the connecting block and the upper wall of the cavity, one end of the spring is connected to the connecting block, and the other end of the spring is connected to the upper wall of the cavity; when the spring is in an initial state, the moving block does not extend out of the through hole.

[0014] Preferably, the bearing plate, the wedge block, the moving block, the connecting block and the spring are combined into a tightening assembly, and a tightening assembly is also provided on the lower flange plate below the second rod and on the spiral pile.

[0015] Preferably, guide cylinders are provided above the first opening and the second opening, and each guide cylinder is provided with an internal thread section.

[0016] Preferably, the upper flange plate is also provided with a connecting mechanism for fixing the air film membrane material, the connecting mechanism includes an angle steel, a second bolt and a second nut arranged on the upper flange plate, the angle steel is connected by a vertical section and a parallel section, the first bolt passes through the parallel section and the upper flange plate and is fixed by the second nut, and the air film membrane material is clamped between the angle steel and the upper flange plate.

[0017] According to another aspect of the present invention, a construction method of an assembled foundation pit air film foundation is provided. The assembled foundation pit air film foundation is the assembled foundation pit air film foundation described above. The construction method of the assembled foundation pit air film foundation comprises:

[0018] Digging foundation pits;

[0019] Inserting screw piles into the ground;

[0020] Align the through holes on the lower flange plate with the screw piles that have been inserted into the ground, and then place the H-shaped steel on the ground;

[0021] Adjacent H-beams are preliminarily connected through a clamping mechanism;

[0022] Take out the first clamping block and the second clamping block of the limiting mechanism, place them on opposite sides of the spiral pile and tighten them;

[0023] Push the movable plate below the first opening to below the second opening, screw the first rod into the first opening, and place the second rod at the second opening for installation;

[0024] The first rod is rotated slowly, so that the first gear segment on the first rod is meshed with the second gear segment on the sliding rod of the moving plate, and the moving plate is driven to slide back along the guide groove;

[0025] Unfold the air film and fix it on the H-shaped steel using a connecting mechanism;

[0026] Check the tightness of the air membrane and inflate the air membrane;

[0027] Check the operation of the exhaust and supply air devices.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects: the present invention constructs a frame through a plurality of H-shaped steels connected end to end, and the clamping mechanism between adjacent H-shaped steels facilitates the rapid assembly of components, improves construction efficiency, and is suitable for various engineering scenarios. The through holes on the lower flange plate cooperate with the spiral ground piles to provide a stable anchor deep into the stratum and enhance the overall stability of the foundation. The limiting mechanism effectively limits the spiral ground piles to prevent them from displacement. While strengthening the connection between adjacent H-shaped steels, the fixing mechanism can trigger the tightening mechanism to work, and the tightening mechanism further enhances the tightening effect of the limiting mechanism on the spiral ground piles. This synergistic effect ensures the reliability of the entire foundation structure under complex working conditions (such as strong winds, vibrations, etc.), ensures the long-term safe and stable operation of the air membrane foundation, reduces maintenance costs, and improves engineering benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0030] Figure 1 It is a schematic diagram of the air film foundation of the present invention installed on the periphery of the foundation pit;

[0031] Figure 2 It is a schematic diagram of the end-to-end butt connection of the H-beam of the present invention;

[0032] Figure 3 It is a cross-sectional view of the H-shaped steel and the spiral pile of the present invention, which is intended to show the installation positions of the fixing mechanism, the limiting mechanism, and the tightening mechanism;

[0033] Figure 4 for Figure 2 A magnified image of point A;

[0034] Figure 5 It is a structural schematic diagram of the H-shaped steel of the present invention;

[0035] Figure 6 for Figure 3 A magnified view of point B;

[0036] Figure 7 It is a schematic diagram of the structure of the movable plate of the present invention;

[0037] Figure 8 is a schematic structural diagram of a first rod member of the present invention;

[0038] Fig. 9 is a schematic diagram of the limiting mechanism of the present invention;

[0039] Fig.10 It is a schematic diagram of the connection mechanism of the present invention.

[0040] The reference numerals represent:

[0041] 10, H-shaped steel, 11, upper flange plate, 12, lower flange plate, 13, web plate, 14, first opening, 15, upper clamping groove, 16, lower clamping groove, 17, through hole, 18, guide groove, 19, first notch,

[0042] 20, second opening, 21, upper clamping block, 22, lower clamping block, 23, second notch,

[0043] 30, first clamping block, 31, second clamping block, 32, first bolt, 33, first nut,

[0044] 40, moving plate, 41, positioning groove, 42, sliding rod, 43, movable groove, 44, second gear segment,

[0045] 50, first rod, 51, first threaded section, 52, first gear section, 53, guide cylinder, 54, second rod, 55, second threaded section,

[0046] 60, bearing plate, 61, wedge block, 62, connecting block, 63, spring, 64, moving block, 65, screw pile,

[0047] 70, air film material, 71, angle steel, 72, second bolt, 73, second nut. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the embodiment of the present invention clearer, the technical scheme of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. The schematic implementation mode of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention. It should be noted that the present invention is already in the actual research and development stage.

[0049] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The words "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0050] There are many problems with the traditional use of H-shaped steel and spiral piles to construct the air membrane foundation. In terms of assembly, the connection method is single, mostly simple welding or universal connectors, lacking efficient structure, and difficult to quickly and accurately connect at complex construction sites. In terms of assembly effect, conventional connection methods cannot ensure stability. When facing external forces such as strong winds and earthquakes, the H-shaped steel connection is prone to loosening and deformation, affecting the stability of the air membrane foundation. Moreover, the traditional design does not organically combine the limiting mechanism with the overall structure. Affected by ground vibrations, changes in deadweight, etc., the limiting mechanism is prone to loosening, making it difficult for the spiral pile limiting effect to last, reducing the safety and durability of the foundation structure.

[0051] Embodiment 1:

[0052] like Figure 1 , Figure 2 , an assembled foundation pit air film foundation, comprising a plurality of H-shaped steels 10 connected end to end in sequence, the H-shaped steel 10 being composed of an upper flange plate 11, a web plate 13 and a lower flange plate 12, one end of the web plate 13 being connected to the upper flange plate 11, the other end of the web plate 13 being connected to the lower flange plate 12, the lower flange plate 12 being in contact with the ground, and a clamping mechanism being arranged between adjacent H-shaped steels 10; a through hole 17 being arranged on the lower flange plate 12, a spiral ground pile 65 inserted into the stratum being arranged in the through hole 17; a limiting mechanism for limiting the spiral ground pile 65 being arranged on the lower flange plate 12; a fixing mechanism for making adjacent upper flange plates 11 abut against each other being arranged between the adjacent upper flange plates 11, and a tightening mechanism being arranged on the spiral ground pile 65; when the fixing mechanism acts, the tightening mechanism can be triggered to tighten the limiting mechanism, thereby increasing the limiting effect of the limiting mechanism on the spiral ground pile 65.

[0053] The H-shaped steel 10 is the key to constructing the foundation frame. Its upper and lower flange plates 12 and web plates 13 form a stable structure. The upper flange plate 11 is used to connect the air membrane and related components. The lower flange plate 12 is anchored to the ground through spiral piles 65, and the web plate 13 enhances the overall rigidity. The spiral piles 65 penetrate deep into the stratum, providing strong pull-out and compression resistance for the foundation. The clamping mechanism facilitates the rapid splicing of adjacent H-shaped steels 10 and improves assembly efficiency. The limiting mechanism effectively constrains the spiral piles 65 to prevent them from moving horizontally. The fixing mechanism enhances the connection strength of the H-shaped steel 10, while the tightening mechanism strengthens the tightening of the spiral piles 65 by the limiting mechanism while fixing the H-shaped steel 10, ensuring the stability of the overall structure.

[0054] First, drive the spiral ground pile 65 into the ground, and place the H-shaped steel 10 with the through hole 17. Preliminarily connect the adjacent H-shaped steels 10 through the clamping mechanism, and then clamp the ground pile with the limiting mechanism. After the H-shaped steel 10 is subsequently hoisted and clamped, operate the fixing mechanism. The first rod 50 rotates to drive the movable plate 40 back to its position and is locked by the second rod 54 to strengthen the connection, and at the same time trigger the tightening mechanism to tighten the limiting mechanism. In practical applications, such as the foundation of a storage air film, this solution can be quickly built and has a stable structure. In the face of complex external forces, the various components work together to ensure that the foundation does not deform or shift, and the air film is safe and stable.

[0055] like Figure 2 , Figure 4 , Figure 5 The clamping mechanism includes an upper clamping groove 15, a lower clamping groove 16, an upper clamping block 21 and a lower clamping block 22; along the length direction of the H-shaped steel 10, at one end of the H-shaped steel 10, an upper clamping groove 15 is provided on the upper flange plate 11, and a lower clamping groove 16 is provided on the lower flange plate 12; at the other end of the H-shaped steel 10, an upper clamping block 21 is provided on the upper flange plate 11, and a lower clamping block 22 is provided on the lower flange plate 12; the upper clamping groove 15 and the upper clamping block 21 match each other, and the lower clamping groove 16 and the lower clamping block 22 match each other, so as to assemble and connect adjacent H-shaped steels 10.

[0056] The function of the clamping mechanism is to achieve rapid and accurate docking of adjacent H-beams 10 in the horizontal direction. In actual construction, along the length direction of the H-beam 10, when two H-beams 10 need to be spliced, the upper clamping groove 15 on the upper flange plate 11 at one end of one H-beam 10 matches the upper clamping block 21 of the upper flange plate 11 at the corresponding end of the other H-beam 10, and the lower clamping groove 16 on the lower flange plate 12 matches the lower clamping block 22. In this way, construction workers can easily perform preliminary assembly and connection of two H-beams 10, which greatly improves the assembly efficiency of the construction site, and is particularly suitable for the construction of large-scale assembled foundation pit air film foundations, which can effectively shorten the construction period and reduce construction costs.

[0057] like Figure 3 , Fig. 9 The limiting mechanism includes a first clamping block 30 arranged on one side of the spiral ground pile 65 and a second clamping block 31 arranged on the other side of the spiral ground pile 65. A first bolt 32 and a first nut 33 are arranged between the first clamping block 30 and the second clamping block 31. The first bolt 32 and the first nut 33 are used to connect the first clamping block 30 and the second clamping block 31.

[0058] The first clamping block 30 and the second clamping block 31 in the limiting mechanism are symmetrically arranged on both sides of the spiral pile 65, and the two are connected by the first bolt 32 and the first nut 33, which limit the spiral pile 65 to prevent it from unnecessary displacement when subjected to external forces (such as wind force, vibration, etc.). In the actual application scenario of the foundation pit air film foundation, the stable spiral pile 65 is the key to the stability of the entire foundation structure. The limiting mechanism ensures the relative fixation of the position of the spiral pile 65, thereby enhancing the stability of the entire assembled foundation pit air film foundation structure in the stratum and ensuring the safe use of the air film building.

[0059] like Figure 3 , Figure 4 , Figure 7 , Figure 8 , along the length direction of the H-shaped steel 10, at one end of the H-shaped steel 10, a first opening 14 is symmetrically provided on the upper flange plate 11, a guide groove 18 is symmetrically provided in the upper flange plate 11, and a first notch 19 is provided on the web 13; at the other end of the H-shaped steel 10, a second opening 20 is symmetrically provided on the upper flange plate 11, and a second notch 23 is provided on the web 13; the fixing mechanism includes a moving plate 40, and both sides of the moving plate 40 are provided with slide bars 42 matching the guide groove 18, so that the moving plate 40 can slide along the length direction of the upper flange plate 11, and the center of the moving plate 40 is provided with a movable groove 43 matching the first notch 19, so that the sliding of the moving plate 40 is not restricted by the web 13; the moving plate 40 is also symmetrically provided with positioning grooves 41 matching the first opening 14 and the second opening 20; the slide bar 42 is provided with a second gear section 44 on both opposite sides; the first opening 14 and the second opening 20 are provided with an inner Thread, a first rod 50 is provided in the first opening 14, and a first threaded section 51 and a first gear section 52 are provided on the first rod 50, a second rod 54 is provided in the second opening 20, and a second threaded section 55 is provided on the second rod 54; the first threaded section 51 matches the internal thread in the first opening 14, and the second threaded section 55 matches the internal thread in the second opening 20; the first gear section 52 matches the second gear section 44; when the first rod 50 is screwed into the first opening 14, the first gear section 52 can control the sliding of the movable plate 40 through the second gear section 44 during the rotation and descent process, and when the movable plate 40 extends below the second opening 20, the second rod 54 is screwed into the second opening 20 and enters the positioning groove 41. At this time, the first rod 50 rotates in the opposite direction to pull the movable plate 40 back, so that the movable groove 43 contacts the second rod 54, thereby strengthening the connection effect between adjacent H-shaped steels 10.

[0060] First, manually push the movable plate 40 located below the first opening 14 outward along the guide groove 18 so that it slides below the second opening 20. Next, screw the first rod 50 into the first opening 14. When the first rod 50 rotates downward, its end gradually approaches and contacts the bearing plate 60 at the upper end of the screw pile 65, exerting downward pressure on the bearing plate 60. At the same time, the first gear segment 52 on the first rod 50 meshes with the second gear segment 44 on the sliding rod 42 of the movable plate 40. As the first rod 50 rotates, the movable plate 40 is driven to slide back (toward the initial position) through gear transmission. When the movable plate 40 slides to a certain position, the second rod 54 is placed at the second opening 20 of the second H-shaped steel 10 and screwed in so that it is embedded in the positioning groove 41 of the movable plate 40. Subsequently, the first rod 50 is continuously rotated to rotate in the opposite direction, and the movable plate 40 is pulled back until the movable plate 40 is stopped by the second rod 54 and stops sliding. At this time, the connection between the two H-shaped steels 10 is strengthened, and the first rod 50 always keeps a tight state against the bearing plate 60 during the descending process.

[0061] like Figure 2 , Figure 6 , along the insertion direction of the spiral pile 65, a cavity is provided inside the spiral pile 65, and the side wall of the spiral pile 65 is symmetrically provided with through holes connecting the cavity with the outside world; the tightening mechanism includes a bearing plate 60 arranged at the upper end of the spiral pile 65, and a wedge block 61 is provided on the bearing plate 60 to penetrate the spiral pile 65 and extend into the cavity; two moving blocks 64 matching the through holes are provided in the cavity, and the two moving blocks 64 can be pushed by the wedge blocks 61 to extend out of the through holes and tighten against the fixing mechanism, and a reset mechanism is provided between the wedge blocks 61 and the upper wall of the cavity; when the first rod 50 is screwed into the first opening 14, the end of the first rod 50 contacts and applies force to the bearing plate 60, pushing the wedge block 61 to make the moving block 64 extend out of the through hole and tighten against the limiting mechanism.

[0062] In the initial state, the reset mechanism (connecting block 62 and spring 63) prevents the movable block 64 from extending out of the through hole. When the first rod 50 in the fixing mechanism is screwed into the first opening 14 and moves downward, its end contacts the bearing plate 60 and applies force to push the wedge block 61 downward. The inclined surface of the wedge block 61 squeezes the movable block 64 to overcome the resistance of the spring 63, so that the movable block 64 extends out through the through hole and presses against the limiting mechanism (the first clamping block 30 and the second clamping block 31). In actual applications of prefabricated foundation pit air film foundations, such as in areas with large wind loads or sites with vibration sources, this mechanism can effectively enhance the fastening of the limiting mechanism to the spiral pile 65 to prevent the limit from loosening due to external factors.

[0063] Construction method:

[0064] S1. Select a suitable construction site, clear obstacles within the site, and ensure that the construction area is flat.

[0065] S2. Use a pile driving device to vertically insert the spiral pile 65 into the ground. The insertion depth must meet the design standards.

[0066] S3. The H-shaped steel 10 is transported to the construction site, and the through holes 17 on the lower flange plate 12 of the H-shaped steel 10 are aligned with the spiral piles 65 inserted into the ground. Then, the H-shaped steel 10 is placed on the ground to preliminarily determine its position.

[0067] S4. Adjacent H-shaped steels 10 are preliminarily connected by means of a clamping mechanism. Specifically, the upper clamping block 21 at one end of one H-shaped steel 10 is aligned with the upper clamping groove 15 at the corresponding end of the other H-shaped steel 10, and the lower clamping block 22 is aligned with the lower clamping groove 16, and then the two H-shaped steels 10 are docked, and the clamping block slides into the clamping groove to achieve preliminary clamping.

[0068] S5. Take out the first clamping block 30 and the second clamping block 31 of the limiting mechanism, and place them on opposite sides of the spiral pile 65, respectively, so that they are closely attached to the outer wall of the spiral pile 65. Pass the first bolt 32 through the mounting holes on the first clamping block 30 and the second clamping block 31, and then screw on the first nut 33 and gradually tighten it. Through the pre-tightening force of the first bolt 32 and the first nut 33, the first clamping block 30 and the second clamping block 31 tightly clamp the spiral pile 65, so as to limit the spiral pile 65 in the horizontal direction and prevent it from displacement.

[0069] S5. Manually push the movable plate 40 located below the first opening 14 of the upper flange plate 11 at one end of the first H-beam 10, so that it slides outward along the guide groove 18 until the movable plate 40 is completely moved below the second opening 20 of the upper flange plate 11 at the corresponding end of the second H-beam 10, ensuring that the movable plate 40 is accurately positioned and can perform subsequent operations normally.

[0070] S6. Screw the first rod 50 into the first opening 14 of the upper flange plate 11 of the first H-beam 10, and place the second rod 54 at the second opening 20 of the upper flange plate 11 of the second H-beam 10 to prepare for installation. Slowly rotate the first rod 50 so that it rotates downward in the first opening 14. During the rotation process, the first gear segment 52 on the first rod 50 engages with the second gear segment 44 on the slide rod 42 of the moving plate 40, driving the moving plate 40 to slide back along the guide groove 18 (toward the initial position). When the moving plate 40 slides to the position of the second rod 54, the positioning groove 41 on the moving plate 40 will align with the second rod 54, and the second rod 54 will be embedded in the positioning groove 41. As the first rod 50 continues to rotate back to its original position, the moving plate 40 continues to slide, and finally the moving plate 40 is blocked by the second rod 54 and stops sliding. Through the cooperation of the moving plate 40, the first rod 50, the second rod 54 and the related gear transmission and other structures, the connection between the two H-shaped steels 10 is strengthened, making the connection tighter and more stable. In the process of the first rod 50 rotating downward, its end will contact the bearing plate 60 at the upper end of the spiral pile 65 and exert downward pressure on the bearing plate 60. After the bearing plate 60 is stressed, it pushes the wedge block 61 located in the internal cavity of the spiral pile 65 to move downward. When the wedge block 61 moves downward, its inclined surface will squeeze the moving blocks 64 on both sides of the cavity, overcome the resistance of the reset mechanism (spring 63), and make the two moving blocks 64 extend outward through the perforations of the side walls of the spiral pile 65. After being extended, the moving block 64 is tightly pressed against the first clamping block 30 and the second clamping block 31 of the limiting mechanism, thereby increasing the force exerted on the limiting mechanism to open outwards, and effectively preventing the limiting mechanism from loosening during subsequent use.

[0071] S7, unfold the air film so that the inner edge of the film corresponds to the inner support member on the H-shaped steel 10, and the outer edge of the film corresponds to the outer support member.

[0072] S8. Use the connection mechanism to fix the air film on the H-shaped steel 10. Specifically, place the angle steel 71 between the edge of the air film and the upper flange plate 11, so that the parallel section of the angle steel 71 fits the upper flange plate 11, and the air film is sandwiched between the angle steel 71 and the upper flange plate 11. Then, pass the second bolt 72 through the parallel section of the angle steel 71 and the corresponding holes on the upper flange plate 11, screw on the second nut 73 and tighten it, and through the cooperation of the angle steel 71, the second bolt 72 and the second nut 73, the air film is firmly fixed on the H-shaped steel 10.

[0073] S9. Carry out necessary debugging work, such as checking the sealing of the air film and checking the operation of the exhaust device and the air supply device.

[0074] Embodiment 2:

[0075] like Figure 6On the basis of the above embodiment, the present embodiment refines the reset mechanism, which includes a connecting block 62 and a spring 63. The connecting block 62 is arranged on the wedge block 61, and the spring 63 is arranged between the connecting block 62 and the upper wall of the cavity. One end of the spring 63 is connected to the connecting block 62, and the other end of the spring 63 is connected to the upper wall of the cavity. When the spring 63 is in the initial state, the moving block 64 does not extend out of the through hole.

[0076] When the force of the first rod 50 on the bearing plate 60 is cancelled (for example, after the fixing mechanism is operated), the spring 63 uses its own elastic force to pull the connecting block 62, thereby driving the wedge block 61 to move upward and reset. At this time, the moving block 64 retracts into the through hole under the action of the spring 63 force and the position change of the wedge block 61, and returns to the initial non-extended state. In actual engineering, this reset function ensures that the pressing mechanism can be reused and maintains the stability and reliability of the structure.

[0077] As a more preferred solution, the bearing plate 60, the wedge block 61, the moving block 64, the connecting block 62 and the spring 63 are combined into a tightening assembly, and a tightening assembly is also provided on the lower flange plate 12 below the second rod 54 and on the spiral pile 65. In the assembled air film foundation of the foundation pit with a larger span, the two tightening assemblies can work together to apply a stable tightening force to the limiting mechanism from different positions, further enhancing the limiting and tightening effect of the entire structure on the spiral pile 65, and ensuring the stability of the spiral pile 65 under complex working conditions.

[0078] Embodiment 3:

[0079] like Figure 3 A guide cylinder 53 is provided above the first opening 14 and the second opening 20, and an internal thread section is provided in each guide cylinder 53. The guide cylinder 53 provides a precise guide for the screwing-in of the first rod 50 and the second rod 54, so that the rods are more stable and accurate during the screwing-in process, avoiding skewness or jamming. In the actual construction process, especially in the construction of large-scale prefabricated foundation pit air film foundation, the guide cylinder 53 helps to improve the construction efficiency and ensure the quality consistency of each connection part.

[0080] like Fig.10 The upper flange plate 11 is also provided with a connecting mechanism for fixing the air film membrane material 70, the connecting mechanism includes an angle steel 71, a second bolt 72 and a second nut 73 arranged on the upper flange plate 11, the angle steel 71 is connected by a vertical section and a parallel section, the first bolt 32 penetrates the parallel section and the upper flange plate 11 and is fixed by the second nut 73, and the air film membrane material 70 is clamped between the angle steel 71 and the upper flange plate 11.

[0081] In practical applications, the angle steel 71 is first placed between the edge of the air membrane and the upper flange plate 11, so that the parallel section of the angle steel 71 fits tightly with the upper flange plate 11, and the air membrane is clamped between the angle steel 71 and the upper flange plate 11. Then, the second bolt 72 is passed through the corresponding holes on the parallel section of the angle steel 71 and the upper flange plate 11, and finally the second nut 73 is screwed on and tightened. In this way, the shape characteristics of the angle steel 71 and the tightening effect of the bolts and nuts are utilized to achieve a reliable connection between the air membrane and the H-shaped steel 10. In prefabricated foundation pit air membrane buildings such as exhibition halls and gymnasiums, the connection mechanism can ensure that the air membrane is still firmly fixed to the foundation structure when subjected to external forces such as wind force and internal air pressure changes, thereby maintaining the integrity and stability of the air membrane structure.

[0082] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present disclosure. The following points need to be explained: In the accompanying drawings of the embodiments of the present invention, only the structures involved in the embodiments of the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the features in the same embodiment and different embodiments of the present invention can be combined with each other. The above is only an exemplary implementation of the present invention, and is not used to limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the attached claims.

Claims

1. An assembled foundation pit air film foundation, comprising a plurality of H-shaped steels (10) connected end to end in sequence, wherein the H-shaped steel (10) is composed of an upper flange plate (11), a web plate (13) and a lower flange plate (12), one end of the web plate (13) is connected to the upper flange plate (11), and the other end of the web plate (13) is connected to the lower flange plate (12), and the lower flange plate (12) contacts the ground, characterized in that: A clamping mechanism is provided between adjacent H-shaped steels (10); The lower flange plate (12) is provided with a through hole (17), and a spiral ground pile (65) inserted into the ground is provided in the through hole (17); the lower flange plate (12) is provided with a limiting mechanism for limiting the position of the spiral ground pile (65); A fixing mechanism is provided between adjacent upper flange plates (11) to enable them to abut against each other, and a tightening mechanism is provided on the spiral ground pile (65); when the fixing mechanism acts, the tightening mechanism can be triggered to tighten the limiting mechanism, thereby increasing the limiting strength of the limiting mechanism on the spiral ground pile (65).

2. The assembled foundation pit air film foundation according to claim 1, characterized in that: The clamping mechanism comprises an upper clamping groove (15), a lower clamping groove (16), an upper clamping block (21) and a lower clamping block (22); along the length direction of the H-shaped steel (10), at one end of the H-shaped steel (10), the upper flange plate (11) is provided with an upper clamping groove (15), and the lower flange plate (12) is provided with a lower clamping groove (16); at the other end of the H-shaped steel (10), the upper flange plate (11) is provided with an upper clamping block (21), and the lower flange plate (12) is provided with a lower clamping block (22); the upper clamping groove (15) and the upper clamping block (21) match each other, and the lower clamping groove (16) and the lower clamping block (22) match each other, so as to assemble and connect adjacent H-shaped steels (10).

3. The assembled foundation pit air film foundation according to claim 2, characterized in that: The limiting mechanism comprises a first clamping block (30) arranged on one side of the spiral ground pile (65) and a second clamping block (31) arranged on the other side of the spiral ground pile (65), a first bolt (32) and a first nut (33) are arranged between the first clamping block (30) and the second clamping block (31), and the first bolt (32) and the first nut (33) are used to connect the first clamping block (30) and the second clamping block (31).

4. The assembled foundation pit air film foundation according to claim 3, characterized in that: Along the length direction of the H-shaped steel (10), at one end of the H-shaped steel (10), the upper flange plate (11) is symmetrically provided with a first opening (14), a guide rail groove (18) is symmetrically provided in the upper flange plate (11), and a first notch (19) is provided on the web plate (13); at the other end of the H-shaped steel (10), the upper flange plate (11) is symmetrically provided with a second opening (20), and the web plate (13) is provided with a second notch (23); The fixing mechanism comprises a movable plate (40), and slide bars (42) matching the guide groove (18) are provided on both sides of the movable plate (40), so that the movable plate (40) can slide along the length direction of the upper flange plate (11); a movable groove (43) matching the first notch (19) is provided in the center of the movable plate (40), so that the sliding of the movable plate (40) is not restricted by the web (13); the movable plate (40) is also symmetrically provided with positioning grooves (41) matching the first opening (14) and the second opening (20); the slide bar (42) is provided with second gear sections (44) on opposite sides; The first opening (14) and the second opening (20) are both provided with internal threads. The first opening (14) is provided with a first rod (50), and the first rod (50) is provided with a first threaded section (51) and a first gear section (52). The second opening (20) is provided with a second rod (54), and the second rod (54) is provided with a second threaded section (55). The first threaded section (51) matches the internal thread in the first opening (14), and the second threaded section (55) matches the internal thread in the second opening (20). The first gear section (52) matches the second gear section (44). When the first rod (50) is screwed into the first opening (14), the first gear segment (52) can control the sliding of the movable plate (40) through the second gear segment (44) during the process of rotating and descending. When the movable plate (40) extends below the second opening (20), the second rod (54) is screwed into the second opening (20) and enters the positioning groove (41). At this time, the first rod (50) rotates in the opposite direction to pull the movable plate (40) back, so that the movable groove (43) contacts the second rod (54), thereby strengthening the connection effect between the adjacent H-shaped steels (10).

5. The assembled foundation pit air film foundation according to claim 4, characterized in that: Along the insertion direction of the spiral ground pile (65), a cavity is provided inside the spiral ground pile (65), and the side wall of the spiral ground pile (65) is symmetrically provided with through holes connecting the cavity with the outside; The tightening mechanism comprises a bearing plate (60) arranged at the upper end of the spiral pile (65), and a wedge block (61) is arranged on the bearing plate (60) and penetrates the spiral pile (65) and extends into the cavity; two moving blocks (64) matching the through holes are arranged in the cavity, and the two moving blocks (64) can be pushed by the wedge block (61) to extend out of the through holes and tighten against the fixing mechanism, and a reset mechanism is arranged between the wedge block (61) and the upper wall of the cavity; when the first rod (50) is screwed into the first opening (14), the end of the first rod (50) contacts and applies force to the bearing plate (60), pushing the wedge block (61) so that the moving block (64) extends out of the through hole and tightens against the limiting mechanism.

6. The assembled foundation pit air film foundation according to claim 5, characterized in that: The reset mechanism comprises a connecting block (62) and a spring (63), wherein the connecting block (62) is arranged on the wedge block (61), and the spring (63) is arranged between the connecting block (62) and the upper wall of the cavity, one end of the spring (63) is connected to the connecting block (62), and the other end of the spring (63) is connected to the upper wall of the cavity; when the spring (63) is in an initial state, the moving block (64) does not extend out of the through hole.

7. The assembled foundation pit air film foundation according to claim 6, characterized in that: The bearing plate (60), the wedge block (61), the moving block (64), the connecting block (62) and the spring (63) are combined into a tightening assembly. A tightening assembly is also provided on the lower flange plate (12) below the second rod (54) and the spiral pile (65).

8. The assembled foundation pit air film foundation according to claim 7, characterized in that: A guide cylinder (53) is provided above the first opening (14) and the second opening (20), and each guide cylinder (53) is provided with an internal thread section.

9. The assembled foundation pit air film foundation according to claim 8, characterized in that: The upper flange plate (11) is also provided with a connecting mechanism for fixing the air film membrane material (70), the connecting mechanism includes an angle steel (71), a second bolt (72) and a second nut (73) arranged on the upper flange plate (11), the angle steel (71) is connected by a vertical section and a parallel section, the first bolt (32) passes through the parallel section and the upper flange plate (11) and is fixed by the second nut (73), and the air film membrane material (70) is clamped between the angle steel (71) and the upper flange plate (11).

10. A construction method for an assembled foundation pit air film foundation, characterized in that: The assembled foundation pit air film foundation is the assembled foundation pit air film foundation described in claim 9, and the construction method of the assembled foundation pit air film foundation comprises: Digging foundation pits; Inserting the screw pile (65) into the ground; Align the through hole (17) on the lower flange plate (12) with the screw pile (65) that has been inserted into the ground, and then place the H-shaped steel (10) on the ground; The adjacent H-shaped steels (10) are preliminarily connected via the clamping mechanism; Take out the first clamping block (30) and the second clamping block (31) of the limiting mechanism, place them on opposite sides of the spiral pile (65) and tighten them; Pushing the movable plate (40) located below the first opening (14) to below the second opening (20), screwing the first rod (50) into the first opening (14), and placing the second rod (54) at the position of the second opening (20) for installation; The first rod (50) is slowly rotated, so that the first gear segment (52) on the first rod (50) is meshed with the second gear segment (44) on the sliding rod (42) of the moving plate (40), thereby driving the moving plate (40) to slide back along the guide groove (18); Unfolding the air film material (70), and fixing the air film material (70) on the H-shaped steel (10) using the connecting mechanism; Checking the sealing performance of the air film material (70) and inflating the film; Check the operation of the exhaust and supply air devices.

Images