A detachable soil nailing wall of a deep foundation pit supporting structure

Abstract

The utility model belongs to the field of soil nailing wall especially a detachable soil nailing wall of deep foundation pit support structure, it includes the fixed seat and the protection board and the fixed mechanism for the support of deep foundation pit, the fixed seat one end is provided with the slot, the four corners of protection board all are fixedly connected with the arc plate, one arc plate of four arc plates is inserted with the slot, the inside of fixed seat is provided with the thread groove no.

Description

Technical Field

[0001] This utility model relates to the field of soil nailing wall technology, and in particular to a detachable soil nailing wall for deep foundation pit support structure. Background Technology

[0002] Soil nailing is an in-situ soil reinforcement technique, typically used to protect foundation pits or slopes. Soil nailing walls are generally classified into permanent support projects and temporary support projects based on their service life. In temporary support projects, the soil nailing wall must be dismantled after its service life has expired. Currently, soil nailing wall construction generally adopts the process of drilling holes for soil nails, binding steel mesh, installing and constructing soil nails, and spraying concrete surface layer on the construction site. This construction method has a long construction process, slow construction speed, and is difficult to dismantle after reaching the service life. It is also not environmentally friendly and not convenient for reuse.

[0003] Therefore, this application proposes a detachable soil nailing wall for deep foundation pit support structure to solve the problems in the background art.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a detachable soil nailing wall for deep foundation pit support structures.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A detachable soil nailing wall for deep foundation pit support structure includes a fixing seat for supporting the deep foundation pit, a protective plate, and a fixing mechanism. One end of the fixed base is provided with a slot, and each of the four corners of the protective plate is fixedly connected with an arc plate. One of the four arc plates is inserted into the slot. The inner side of the fixed base is provided with a threaded groove. A threaded rod is threadedly connected to the threaded groove. The fixing mechanism is set on the arc plate and the threaded rod. The fixing mechanism is connected to the fixed base. One end of the threaded rod is fixedly connected with a baffle. One end of the baffle is in contact with the protective plate. The fixing mechanism includes a limiting rod one, a limiting rod two, a threaded rod two, and a piston one. Four limiting rods two are movably connected to the threaded rod one. Through the cooperative design between the fixing seat, the arc plate, the protective plate, the threaded rod one, and the fixing mechanism, each component only needs to be assembled in sequence and fixed by the fixing mechanism to achieve the effect of supporting the deep foundation pit. The components can be disassembled by reversing the operation. Since the protective plate is detachable, it can be reused, which will not cause material waste and also reduce the impact of the soil nailing wall structure on the backfilled foundation pit structure.

[0007] Preferably, a limiting rod 1 is slidably connected to the arc plate and corresponds to four limiting rods 2. One end of the limiting rod 1 passes through the arc plate and is engaged with the fixed seat. Through the interaction between the limiting rod 1 and the slot, the corresponding arc plate and protective plate are limited. At the same time, through the interaction between the four limiting rods 2 and the four arc plates respectively, the threaded rod 1 is limited.

[0008] Preferably, a liquid storage tank is provided on the inner side of the threaded rod, and four sliding grooves are provided on the threaded rod. The four limiting rods move in the four sliding grooves respectively. All four sliding grooves are connected to the liquid storage tank. Hydraulic oil is provided in the liquid storage tank, and the four limiting rods are driven to move on the threaded rod through hydraulic transmission.

[0009] Preferably, a piston is slidably connected inside the liquid storage tank, and a threaded rod is rotatably connected to one side of the piston. The threaded rod is threadedly connected to the threaded rod and is used to squeeze the hydraulic oil in the liquid storage tank. Under the action of pressure, the four limiting rods extend outward. By moving the piston in the opposite direction a certain distance, a negative pressure can be generated in the liquid storage tank, thereby retracting the four limiting rods into the threaded rod.

[0010] Preferably, one end of the threaded rod is fixedly connected to a rotating plate, which facilitates the operator to rotate the threaded rod.

[0011] Preferably, one end of the limiting rod is fixedly connected to a slider, the slider is slidably connected to the arc plate, one side of the slider is fixedly connected to a spring, one end of the spring is fixedly connected to the arc plate, the limiting rod moves in the opposite direction and disengages from the slot on the inner side of the fixed seat due to the elastic potential energy of the spring and the transmission of the slider, thereby achieving the effect of automatically releasing the limiting of the arc plate.

[0012] Preferably, the four arc plates are all adapted to the slot at one end of the fixed seat and the threaded rod.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model discloses a detachable soil nailing wall for deep foundation pit support. Through the coordinated design of the fixing seat, arc plate, protective plate, threaded rod, and fixing mechanism, each component can be assembled sequentially and fixed by the fixing mechanism to achieve the effect of supporting the deep foundation pit. The components can be disassembled by reversing the operation. Since the protective plate is detachable, it can be reused, avoiding material waste and reducing the impact of the soil nailing wall structure on the backfilled foundation pit structure. Attached Figure Description

[0014] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary. The structures, proportions, sizes, etc., shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance, and any modification of the structure, change of the proportional relationship, or adjustment of the size is not permitted.

[0015] Figure 1 This is a schematic diagram of the assembly structure of a detachable soil nailing wall for a deep foundation pit support structure proposed in this utility model. Figure 2 This is an anatomical diagram of a detachable soil nailing wall for a deep foundation pit support structure proposed in this utility model. Figure 3 An exploded view of a detachable soil nailing wall for a deep foundation pit support structure proposed in this utility model. Figure 4 for Figure 2 Enlarged structural diagram at point A Figure 5 This is a structural diagram of the arc plate, limit rod one, limit rod two, slider, and spring.

[0016] Explanation of reference numerals in the attached drawings: 1. Fixed seat; 2. Arc plate; 3. Protective plate; 4. Threaded rod one; 5. Baffle; 6. Limiting rod one; 7. Limiting rod two; 8. Threaded rod two; 9. Piston one; 10. Rotating plate; 11. Sliding block; 12. Spring; 13. Liquid storage tank. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] This utility model provides a detachable soil nailing wall for deep foundation pit support structure, as shown in the reference. Figures 1-5 A detachable soil nailing wall for deep foundation pit support structure includes a fixing seat 1 for supporting the deep foundation pit, a protective plate 3, and a fixing mechanism.

[0019] A slot is provided at one end of the fixed base 1. Arc plates 2 are fixedly connected to the four corners of the protective plate 3. One of the four arc plates 2 is inserted into the slot. A threaded groove is provided on the inner side of the fixed base 1. A threaded rod 4 is connected to the threaded groove. The fixing mechanism is set on the arc plate 2 and the threaded rod 4. The fixing mechanism is connected to the fixed base 1. A baffle 5 is fixedly connected to one end of the threaded rod 4. One end of the baffle 5 is in contact with the protective plate 3.

[0020] The fixing mechanism includes limit rod 6, limit rod 7, threaded rod 8, and piston 9. Four limit rods 7 are movably connected to threaded rod 4. Through the cooperative design between fixing seat 1, arc plate 2, protective plate 3, threaded rod 4, and fixing mechanism, each component can be assembled in sequence and fixed by the fixing mechanism to achieve the effect of supporting the deep foundation pit. The components can be disassembled by reversing the operation. Since the protective plate 3 is detachable, it can be reused, which will not cause material waste and also reduce the impact of the soil nailing wall structure on the backfilled foundation pit structure.

[0021] In this embodiment, the protective plate 3 is made of high-strength recyclable aluminum alloy with a yield strength of not less than 200MPa. This material ensures support strength while meeting environmental protection requirements, effectively solving the environmental problems of traditional soil nailing walls in the background technology. Furthermore, the surface of the protective plate 3 is anodized to form an oxide film approximately 20μm thick, enhancing its corrosion resistance and extending its service life. A limiting rod 6 is slidably connected to the arc plate 2, corresponding to four limiting rods 7. One end of the limiting rod 6 penetrates the arc plate 2 and engages with the fixing seat 1. Through the interaction between the limiting rod 6 and the slot, the corresponding arc plate 2 and protective plate 3 are limited. Simultaneously, through the interaction between the four limiting rods 7 and the four arc plates 2, the threaded rod 4 is limited. To ensure the limiting effect, the fit between the limiting rod 6 and the slot is designed as a trapezoidal structure with an inclination angle of 15°. This structure automatically enhances the clamping effect when subjected to lateral force.

[0022] In this embodiment, a liquid storage tank 13 is provided on the inner side of the threaded rod 4. Four sliding grooves 1 are provided on the threaded rod 4, and four limiting rods 2 7 move within each of the four sliding grooves 1. All four sliding grooves 1 are connected to the liquid storage tank 13. The liquid storage tank 13 is filled with anti-wear hydraulic oil, with a kinematic viscosity of 32-46 mm² / s at 40°C. The four limiting rods 2 7 are driven to move on the threaded rod 4 via hydraulic transmission. A piston 2 is fixedly connected to one end of each of the four limiting rods 2 7, and the four pistons 2 move within each of the four sliding grooves 1. To prevent hydraulic oil leakage, an O-ring is provided at the connection between the sliding groove 1 and the liquid storage tank 13. The O-ring is made of nitrile rubber with a Shore hardness of 70 HA, and can maintain good sealing performance within a temperature range of -20°C to 120°C.

[0023] In this embodiment, a piston 9 is slidably connected inside the storage tank 13. A threaded rod 8 is rotatably connected to one side of the piston 9. A bearing 1 is fixedly sleeved at one end of the threaded rod 8. The outer wall of the bearing 1 is fixedly connected to the piston 9. The threaded rod 8 is threadedly connected to the threaded rod 4, which is used to squeeze the hydraulic oil in the storage tank 13. Under the action of pressure, the four limiting rods 7 extend outward. By moving the piston 9 in the opposite direction a certain distance, a negative pressure can be generated in the storage tank 13, thereby retracting the four limiting rods 7 into the threaded rod 4. In actual operation, when the rotating plate 10 rotates the threaded rod 8 one revolution, the piston 9 moves 0.5mm in the storage tank 13. This precise parameter setting can ensure that the limiting rods 7 extend and retract smoothly and accurately, ensuring the efficiency of the installation and dismantling of the support structure and effectively solving the problem of difficult demolition of traditional soil nailing walls in the background art. To facilitate operators in judging the extension status of the limit rod 7, a scale mark is provided on the outer wall of the threaded rod 4, with each mark representing 0.1mm extension of the limit rod 7.

[0024] In this embodiment, a rotating plate 10 is fixedly connected to one end of the threaded rod 8. The rotating plate 10 has a diameter of 80mm and an anti-slip texture on its surface to facilitate the rotation of the threaded rod 8 by the operator. In addition, a torque indicator is provided on the rotating plate 10. When the torque applied to the rotating plate 10 reaches the design value (15N·m), the device will emit an audible and visual warning to prevent damage to the components due to over-tightening.

[0025] In this embodiment, a slider 11 is fixedly connected to one end of the limiting rod 6. The slider 11 is slidably connected to the arc plate 2. A spring 12 is fixedly connected to one side of the slider 11. One end of the spring 12 is fixedly connected to the arc plate 2. The elastic coefficient of the spring 12 is 10 N / mm. The limiting rod 6 moves in the opposite direction and disengages from the slot on the inner side of the fixed seat 1 due to the elastic potential energy of the spring 12 and the transmission of the slider 11, thereby automatically releasing the limiting effect on the arc plate 2. The arc plate 2 has a sliding groove 2 that is adapted to the slider 11. To prevent the slider 11 from disengaging from the arc plate 2 during sliding, limiting protrusions with a height of 2 mm are provided at both ends of the sliding groove 2.

[0026] In this embodiment, the four arc plates 2 are all compatible with the slots at one end of the fixed base 1 and the threaded rod 4. Before installation, the arc plates 2, slots, and threaded rod 4 should be cleaned and lubricated. Molybdenum disulfide grease is used as the lubricant, which can effectively reduce frictional resistance and improve installation efficiency.

[0027] Working Principle: In use, first determine the spacing of the fixing seats 1 based on the geological survey report of the deep foundation pit. For general soil, the spacing of the fixing seats 1 is set between 1.5-2m; for soft soil, the spacing is reduced to 1-1.2m to enhance the stability of the support structure. When installing the fixing seats 1, use anchor rods to fix them to the side wall of the foundation pit. The diameter of the anchor rod is 28mm, and the length is selected within the range of 2-3m depending on the soil conditions. The pull-out force of the anchor rod is not less than 150kN. Then, insert the arc plate 2 on one corner of one of the four adjacent protective plates 3 into the slot at one end of the fixing seat 1 (as shown in the attached diagram). Figure 1 and Figure 2(As shown), then, threaded rod 4 is threadedly connected to fixed seat 1, and baffle 5 is made to contact protective plate 3, and the four limiting rods 7 are respectively aligned with the four limiting rods 6. Then, by rotating rotating plate 10, threaded rod 8 is rotated and threadedly driven with threaded rod 4, and one end of threaded rod 8 drives piston 9 to move in liquid storage tank 13. At the same time, piston 9 squeezes the hydraulic oil in liquid storage tank 13. At this time, under the action of hydraulic pressure, the four limiting rods 7 extend outward and push the corresponding limiting rods 6. At the same time, the limiting rods 6 drive slider 11 to move synchronously and compress spring 12 of water conveying slider 11, and the four limiting rods 6... One end of each rod engages with a slot on the inner side of the fixed base 1. At this point, the interaction between the limiting rod 6 and the slot effectively limits the corresponding arc plate 2 and protective plate 3. Simultaneously, the interaction between the four limiting rods 7 and the four arc plates 2 respectively limits the threaded rod 4. Furthermore, the baffle 5 further limits the protective plate 3, improving stability. Throughout the support process, stress sensors installed on the protective plate 3 can monitor the stress on the support structure in real time. The stress sensor's accuracy is ±0.5%FS. When the detected stress exceeds 80% of the design value, an early warning signal is issued, allowing for timely reinforcement measures. In summary, this achieves the effect of supporting deep foundation pits.

[0028] When the protective plate 3 needs to be disassembled, firstly, the rotating plate 10 is rotated in the reverse direction, and under the transmission of the threaded rod 8, the piston 9 moves in the reverse direction within the liquid storage tank 13, creating a negative pressure within the tank. This causes the four limiting rods 7 to slide in the reverse direction a certain distance within the four sliding grooves and disengage from the four arc plates 2. Simultaneously, the limiting rod 6, through the elastic potential energy of the spring 12 and the transmission of the slider 11, moves in the reverse direction and disengages from the slot on the inner side of the fixed seat 1. Then, the threaded rod 4 and the protective plate 3 are removed sequentially. During the disassembly process, due to the reasonable structural design of each component, the disassembly operation is simple and quick, improving efficiency by more than 60% compared to traditional soil nail wall disassembly, further solving the problem of difficult disassembly in the background technology. After cleaning, inspection, and maintenance, the disassembled components can be reused, reducing project costs.

[0029] The technological advancements of this invention compared to existing technologies are as follows: Through the coordinated operation of its various components, it not only achieves the effect of supporting deep foundation pits but also enables the disassembly and assembly of the soil nailing wall. Because the protective plate 3 is detachable, it can be reused, preventing material waste and reducing the impact of the soil nailing wall structure on the backfilled foundation pit structure. Furthermore, it is simple to connect and more practical. Simultaneously, through various optimized designs and safety measures, the reliability and service life of the support structure are further improved.

[0030] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A demountable soil-nailing wall of a deep foundation pit support structure, characterized by, Includes a fixed base (1) for supporting deep foundation pits, a protective plate (3), and a fixing mechanism; The fixed base (1) has a slot at one end, and the protective plate (3) has arc plates (2) fixedly connected to each of its four corners. One of the four arc plates (2) is inserted into the slot. The fixed base (1) has a threaded groove on its inner side. A threaded rod (4) is threadedly connected to the threaded groove. The fixing mechanism is set on the arc plate (2) and the threaded rod (4). The fixing mechanism is connected to the fixed base (1). A baffle (5) is fixedly connected to one end of the threaded rod (4). One end of the baffle (5) is in contact with the protective plate (3). The fixing mechanism includes a first limiting rod (6), a second limiting rod (7), a second threaded rod (8), and a first piston (9). Four second limiting rods (7) are movably connected to the first threaded rod (4).

2. A demountable soil nailed wall of a deep excavation support structure according to claim 1, wherein, The arc plate (2) is slidably connected to a limiting rod one (6) and corresponds to four limiting rods two (7). One end of the limiting rod one (6) passes through the arc plate (2) and is engaged with the fixed seat (1).

3. A demountable soil nailed wall of a deep excavation support structure according to claim 1, wherein, The inner side of the threaded rod (4) is provided with a liquid storage tank (13), and four sliding grooves are provided on the threaded rod (4). The four limiting rods (7) move in the four sliding grooves respectively, and the four sliding grooves are all connected to the liquid storage tank (13).

4. A demountable soil nailed wall of a deep excavation support structure according to claim 3, wherein, A piston (9) is slidably connected inside the liquid storage tank (13). A threaded rod (8) is rotatably connected to one side of the piston (9). The threaded rod (8) is threadedly connected to the threaded rod (4).

5. A demountable soil nailed wall of a deep excavation support structure according to claim 4, wherein, One end of the threaded rod (8) is fixedly connected to a rotating plate (10).

6. A demountable soil nailed wall of a deep excavation support structure according to claim 2, wherein, One end of the limiting rod (6) is fixedly connected to a slider (11), and the slider (11) is slidably connected to the arc plate (2).

7. A demountable soil nailed wall of a deep excavation support structure according to claim 6, wherein, A spring (12) is fixedly connected to one side of the slider (11), and one end of the spring (12) is fixedly connected to the arc plate (2).

8. A demountable soil nailed wall of a deep excavation support structure according to claim 1, wherein, The four arc plates (2) are all adapted to the slot at one end of the fixed seat (1) and the threaded rod (4).

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