A reinforcing device for a soil nailing wall supporting structure of a sand soil foundation pit

Abstract

The utility model discloses a sand soil geological foundation pit soil nailing wall supporting structure reinforcing device relates to building support technical field, including foundation pit slope reinforcing layer, the opening is fixed to be provided with the opening one side of foundation pit slope reinforcing layer. The utility model provides the device in foundation pit slope reinforcing layer is the base support, cooperates the steel bar net layer of the steel bar of the multiple screw thread steel bar wearing and setting the superimposed type supporting panel, forms the cooperative anchoring system, and the close connection of screw thread steel bar and steel bar net layer can effectively transfer the supporting force to the deep sand of foundation pit slope, avoids the problem that the sand soil particle progressive migration under traditional single grouting anchoring, significantly improves the effective anchoring radius stability of soil nailing anchoring section, reduces the attenuation of anchoring force with time, guarantees the long -term anchoring effect of supporting structure.

Description

Technical Field

[0001] This utility model relates to the field of building support technology, specifically to a reinforcement device for soil nailing wall support structure of sandy soil foundation pit. Background Technology

[0002] In the construction of foundation pits in sandy soil, traditional soil nailing wall support structures often face the following technical challenges that have not been fully resolved.

[0003] First, the weak cohesion between sand particles makes them prone to gradual migration after excavation, leading to a decrease in the effective anchoring radius of the soil nail anchoring section over time. Traditional soil nails, which only bond with the sand through a single grouting body, are insufficient to prevent the decrease in anchoring force caused by particle migration. Second, after precipitation or construction disturbance, the sand skeleton is prone to compression deformation, creating gaps between the support panel and the slope sand, resulting in secondary stress concentration in the support structure. Traditional rigid panels cannot adapt to this micro-deformation, easily leading to panel cracking and local voids. Third, traditional soil nail wall drainage systems often use a single drainage pipe, which is easily blocked by sand particles entering the pipe with pore water, preventing effective release of pore water pressure and exacerbating the risk of slope instability. Fourth, existing support structures lack real-time monitoring of the internal stress state of the sand, making it impossible to provide early warning of sudden stress changes in the support structure caused by sand creep, and easily missing the opportunity for reinforcement. Utility Model Content

[0004] In view of the problems existing in the above-mentioned foundation pit soil nailing wall support structure reinforcement device, this utility model is proposed.

[0005] Therefore, the purpose of this utility model is to provide a reinforcement device for soil nailing wall support structure in sandy soil foundation pits, which solves the problem that traditional soil nails, which only rely on a single grouting body to bond with sand, are difficult to prevent the decrease in anchoring force caused by particle migration.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A soil nailing wall support structure reinforcement device for sandy soil foundation pits includes a foundation pit slope reinforcement layer. An opening is fixedly provided on one side of the foundation pit slope reinforcement layer, and multiple threaded steel bars are provided in the opening. A composite support panel is provided on one side of the foundation pit slope reinforcement layer. The composite support panel consists of a steel mesh layer, a fiber concrete layer, and a water-cutting membrane layer from the inside to the outside. The threaded steel bars pass through the steel mesh layer. Reinforcing ribs are provided at the bottom of the foundation pit slope reinforcement layer and the composite support panel. A drainage pipe is fixedly provided between the foundation pit slope reinforcement layer and the composite support panel. A corrugated hose is fixedly provided at one end of the drainage pipe, and multiple openings are fixedly provided on the surface of the corrugated hose.

[0007] Preferably, the outer wall of the corrugated hose is wrapped with a geotextile filter layer.

[0008] Preferably, a filter cover is fixed between the drain pipe and the corrugated hose, and the filter cover is filled with quartz sand filter media.

[0009] Preferably, a waterstop strip is fixedly provided on one side of the reinforcing rib.

[0010] Furthermore, a fiber Bragg grating sensor is fixedly mounted on one side of the reinforcing rib, and a protective sleeve is fitted over the fiber Bragg grating sensor.

[0011] Preferably, a warning label layer is fixedly provided on one side of the composite support panel.

[0012] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. In this utility model, the slope reinforcement layer of the foundation pit provided by the device is a base support, and multiple threaded steel bars are inserted into the steel mesh layer of the composite support panel to form a collaborative anchoring system. The tight connection between the threaded steel bars and the steel mesh layer can effectively transfer the support force to the deep sand of the foundation pit slope, avoid the problem of gradual migration of sand particles under traditional single grouting anchoring, significantly improve the stability of the effective anchoring radius of the soil nail anchoring section, reduce the attenuation of anchoring force over time, and ensure the long-term anchoring effect of the support structure.

[0013] 2. In this utility model, the composite support panel adopts a three-layer composite structure. The steel mesh layer constructs a load-bearing skeleton through steel bars, which enhances the overall load-bearing capacity of the panel. The fiber concrete layer is mixed with polypropylene fibers, which can improve the crack resistance of the panel and effectively adapt to the compression deformation of sandy soil caused by precipitation or construction disturbance, avoiding the cracking and local void problems caused by the inability of traditional rigid panels to adapt to micro-deformation. The outer water-cutting membrane layer can block external rainwater from seeping into the sandy soil of the foundation pit slope, prevent rainwater from damaging the sandy soil skeleton structure, and further maintain the stability of the slope.

[0014] 3. This utility model's drainage system utilizes a corrugated flexible hose with multiple openings on its surface to expand the pore water collection range. The outer geotextile filter layer initially intercepts sand particles, while the filter cover between the drainage pipe and the corrugated hose, along with the internal quartz sand filter media, provides secondary filtration of fine particles, completely solving the problem of traditional single drainage pipes being easily clogged by sand particles. This design efficiently collects and discharges pore water from sand, effectively releasing pore water pressure, reducing the risk of slope instability caused by pore water pressure accumulation, and improving the anti-slip capacity of the support structure. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a three-dimensional structural diagram of the composite support panel of this utility model. Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the corrugated hose of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Foundation pit slope reinforcement layer; 2. Opening; 3. Threaded steel bar; 4. Steel mesh layer; 5. Fiber reinforced concrete layer; 6. Water-stop membrane layer; 7. Reinforcing bar; 8. Drainage pipe; 9. Corrugated hose; 10. Opening; 11. Geotextile filter layer; 12. Filter cover; 13. Quartz sand filter media; 14. Waterstop strip; 15. Fiber optic grating sensor; 16. Protective sleeve; 17. Warning sign layer; 18. Composite support panel. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] This utility model discloses a device for reinforcing a soil nailing wall support structure in a sandy soil foundation pit.

[0020] This utility model provides, for example Figure 1-3The illustrated soil nailing wall support structure reinforcement device for a sandy soil foundation pit includes a foundation pit slope reinforcement layer 1. An opening 2 is fixedly provided on one side of the foundation pit slope reinforcement layer 1, and multiple threaded steel bars 3 are installed within the opening 2. A composite support panel 18 is provided on one side of the foundation pit slope reinforcement layer 1. The composite support panel 18 consists of a steel mesh layer 4, a fiber concrete layer 5, and a water-cutting membrane layer 6, arranged sequentially from the inside out. The threaded steel bars 3 pass through the steel mesh layer 4. Reinforcing ribs 7 are provided at the bottom of the foundation pit slope reinforcement layer 1 and the composite support panel 18. A drainage pipe 8 is fixedly provided between the foundation pit slope reinforcement layer 1 and the composite support panel 18. A corrugated flexible hose 9 is fixedly provided at one end of the drainage pipe 8, and multiple openings 10 are fixedly provided on the surface of the corrugated flexible hose 9. The foundation pit slope reinforcement layer 1 serves as the core foundation, and the foundation pit slope is first... The surface sand is compacted to initially improve the density and cohesion between sand particles, providing a stable support base for the subsequent support structure. An opening 2 is made on one side of the reinforcement layer 1 of the foundation pit slope, and multiple threaded steel bars 3 are embedded inside. One end of the threaded steel bar 3 penetrates into the sand inside the reinforcement layer, and the other end passes through the steel mesh layer 4 of the composite support panel 18. This system can transfer the lateral earth pressure of the foundation pit borne by the composite support panel 18 to the deep sand of the foundation pit slope through the threaded steel bars 3, avoiding pressure concentration in a localized area of ​​the panel. At the same time, the grid structure of the steel mesh layer 4 is used to evenly distribute the force throughout the support panel, achieving efficient transmission and distribution of support force, reducing the gradual migration of sand particles due to uneven stress, maintaining the stability of the effective anchorage radius of the anchorage section, and ensuring the stability of the composite support surface. Panel 18 adopts a three-layer composite structure, with each layer performing different functions and working together from the inside out: The inner steel mesh layer 4 is woven from high-strength steel bars, forming the structural framework of the panel. When subjected to lateral earth pressure, it can resist panel deformation through the tensile strength of the steel bars, providing structural support for the entire panel. The middle fiber concrete layer 5 contains fiber materials that can effectively inhibit the generation and expansion of micro-cracks inside the concrete. When the sandy soil layer undergoes compressive micro-deformation due to precipitation or construction disturbance, the fiber concrete layer 5 can adapt to this deformation through its own toughness, avoiding the cracking and delamination of traditional rigid panels due to their inability to adapt to deformation. The outer water-blocking membrane layer 6 is tightly attached to the fiber concrete layer 5, utilizing the water-blocking properties of its high-density polyethylene material to block the infiltration of external rainwater and surface water. To prevent the sand from weakening due to increased water content and causing structural damage, the corrugated hose 9 is installed between the foundation pit slope reinforcement layer 1 and the composite support panel 18. Multiple openings 10 on its surface increase the contact area with the sand, efficiently collecting pore water seeping from the sand. The geotextile filter layer 11 wrapped around the outside of the corrugated hose 9 initially intercepts larger sand particles carried in the water, preventing them from entering the hose and causing blockage. Subsequently, the pore water flows through the corrugated hose 9 into the drainage pipe 8, where a filter cover 12 and quartz sand filter media 13 at the connection point further enhance the drainage.A secondary filtration process is performed on the residual fine particles in the water to ensure that the water entering the drainage pipe 8 is free of impurities. Finally, the filtered pore water is discharged outside the foundation pit through the drainage pipe 8, effectively releasing the pore water pressure in the sandy soil layer and preventing the sandy soil skeleton from becoming unstable and the slope from sliding due to the accumulation of pore water pressure. This ensures the anti-sliding capacity of the support structure. The reinforcing ribs 7 set at the bottom of the foundation pit slope reinforcement layer 1 and the composite support panel 18 can enhance the overall rigidity and support strength of the bottom of the support structure, reduce the settlement and deformation of the structure caused by vertical loads during the foundation pit excavation, and at the same time, the reinforcing ribs 7 and the reinforcement layer and panel are fixed together. The fixed connection transfers the bottom force to the surrounding stable strata, improving the overall overturning resistance of the support structure and preventing overturning failure due to bottom instability. The waterstop strip 14 fixed on one side of the reinforcing rib 7 is made of water-swellable rubber. In a dry state, it fits tightly with the composite support panel 18. When rainwater or groundwater seeps in along the gap between the reinforcing rib 7 and the panel, the waterstop strip 14 expands rapidly upon contact with water, filling the gap and forming a sealing barrier to block the seepage path. This prevents seepage water from entering the sandy soil of the foundation pit slope and damaging the sandy soil structure, further maintaining the integrity of the sandy soil skeleton and reducing the adverse effects of seepage on the stability of the support structure.

[0021] To prevent blockages, such as Figure 1-2 As shown, the outer wall of the corrugated hose 9 is wrapped with a geotextile filter layer 11.

[0022] In order to perform filtering, such as Figure 3 As shown, a filter cover 12 is fixed between the drain pipe 8 and the corrugated hose 9, and the filter cover 12 is filled with quartz sand filter media 13.

[0023] To prevent leaks, such as Figure 2 As shown, a waterstop strip 14 is fixedly provided on one side of the reinforcing rib 7.

[0024] Finally, in order to provide early warning, such as Figure 2 As shown, a fiber optic grating sensor 15 is fixedly installed on one side of the reinforcing rib 7, and a protective sleeve 16 is fitted over the fiber optic grating sensor 15. A warning label layer 17 is fixedly installed on one side of the composite support panel 18.

[0025] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A soil nailing wall support structure reinforcement device for sandy soil foundation pits, comprising a foundation pit slope reinforcement layer (1), characterized in that, An opening (2) is fixedly provided on one side of the foundation pit slope reinforcement layer (1), and multiple threaded steel bars (3) are provided in the opening (2). A composite support panel (18) is provided on one side of the foundation pit slope reinforcement layer (1). The composite support panel (18) consists of a steel mesh layer (4), a fiber concrete layer (5), and a water-cutting membrane layer (6) from the inside to the outside. The threaded steel bars (3) pass through the steel mesh layer (4). Reinforcing bars (7) are provided at the bottom of the foundation pit slope reinforcement layer (1) and the composite support panel (18). A drainage pipe (8) is fixedly provided between the foundation pit slope reinforcement layer (1) and the composite support panel (18). A corrugated hose (9) is fixedly provided at one end of the drainage pipe (8). Multiple openings (10) are fixedly provided on the surface of the corrugated hose (9).

2. The soil nailing wall support structure reinforcement device for sandy soil foundation pits according to claim 1, characterized in that, The outer wall of the corrugated hose (9) is wrapped with a geotextile filter layer (11).

3. The soil nailing wall support structure reinforcement device for sandy soil foundation pits according to claim 1, characterized in that, A filter cover (12) is fixed between the drain pipe (8) and the corrugated hose (9), and the filter cover (12) is filled with quartz sand filter media (13).

4. The soil nailing wall support structure reinforcement device for sandy soil foundation pits according to claim 1, characterized in that, A waterstop strip (14) is fixedly provided on one side of the reinforcing rib (7).

5. The soil nailing wall support structure reinforcement device for sandy soil foundation pits according to claim 1, characterized in that, A fiber optic grating sensor (15) is fixedly provided on one side of the reinforcing rib (7), and a protective sleeve (16) is provided on the outside of the fiber optic grating sensor (15).

6. The soil nailing wall support structure reinforcement device for sandy soil foundation pits according to claim 5, characterized in that, A warning label layer (17) is fixedly provided on one side of the composite support panel (18).

Images