Foundation pit enclosure structure

Abstract

The utility model discloses a foundation pit support structure, including a plurality of support column that sets along the foundation pit side slope array and set up in the support column between adjacent support plate, its characterized in that: support column stretches into to underground and is fixedly connected with pile foundation, the one side of support column near side slope is longitudinally provided with the partition that is used for separating support plate, the base is provided with on support column in the bottom of partition department, the base is slidably connected with the moving plate that is close to or away from support plate, and support column sets up along the side slope and is fixedly connected with pile foundation in the bottom, and enough support is provided for foundation pit support structure, the utility model sets up, and support plate is hoisted and directly inserted between moving plate and support column, and the bottom is inserted into the accommodating groove, in the process of using, the earth and stone of foundation pit edge extrude support plate and moving plate, and moving plate force compression elastic part and closely adhere with support plate, and fix support plate.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit construction technology, specifically to foundation pit retaining structures. Background Technology

[0002] Foundation pit support refers to the measures implemented to support, reinforce, and protect the sidewalls and surrounding environment of a foundation pit to ensure the safety of foundation pit excavation and underground engineering construction. Through retaining structures such as pile walls, sheet piles, and diaphragm walls, combined with support systems such as anchor bolts, soil nailing walls, or steel bracing, it effectively resists lateral soil pressure, groundwater seepage, and ground loads. Its core functions include controlling foundation pit deformation, blocking groundwater, preventing slope collapse, and ensuring the safety of surrounding buildings and pipelines. It is widely used in deep foundation pit projects such as basements of high-rise buildings, subway stations, and integrated utility tunnels. A customized solution must be developed based on geological survey data, excavation depth, and environmental requirements, integrating structural mechanics and soil mechanics principles to achieve a balance between safe support and economical construction.

[0003] An investigation revealed that Chinese utility model patent CN216765919U discloses a foundation pit retaining structure for municipal engineering projects. The structure includes precast slabs placed on the ground, connecting rods inserted through the precast slabs, and a concrete layer. A gap exists between the precast slabs and the pit sidewalls. Through holes are provided in the precast slabs, through which the connecting rods pass. A limiting part is provided on the connecting rod, located on the side of the precast slab away from the pit sidewalls and abutting against the precast slabs. The connecting rods are inserted into the ground. The concrete layer is located between the precast slabs and the pit sidewalls. This foundation pit retaining structure involves placing multiple precast slabs into the pit, then inserting the connecting rods through the through holes in the precast slabs, and ensuring the limiting part on the connecting rods is in contact with the pit sidewalls. The precast slab is then placed against the foundation pit wall, and workers pour concrete between the slab and the pit wall. After the concrete hardens, a concrete layer is formed. The precast slab, connecting rods, and concrete layer together form the foundation pit enclosure. The connecting rods extend into the soil on the pit wall, improving the stability of the enclosure. However, the connecting rods in this enclosure are not suitable for soft soil or soil with low cohesion. Relying solely on the rods is insufficient to resist the lateral pressure of the soil and the ground load. The concrete layer is a cast-in-place structure and cannot be constructed as a whole. In actual construction, it needs to be completed in units. For large-scale foundation pit enclosure projects, the work of fixing and waterproofing between units requires a lot of manpower and resources.

[0004] Therefore, this utility model provides a foundation pit retaining structure to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a foundation pit retaining structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a foundation pit retaining structure, comprising a plurality of support columns arranged in an array along the slope of the foundation pit and retaining plates arranged between adjacent support columns, characterized in that: the support columns extend into the ground and are fixedly connected to the pile foundation; the support columns have a longitudinally arranged partition for separating the retaining plates on the side near the slope; a base is provided on the support column at the bottom of the partition; a movable plate is slidably connected to the base, moving closer to or further away from the retaining plates; the support columns are arranged along the slope and fixedly connected to the pile foundation at the bottom, providing sufficient support for the foundation pit retaining structure; when the retaining structure is erected, sufficient gap is left between the movable plate and the support columns; the retaining plates are lifted and directly inserted between the movable plate and the support columns, with the bottom inserted into the receiving groove; during use, the soil and rocks at the edge of the foundation pit squeeze the retaining plates and the movable plates; the movable plates are compressed by the force and tightly fit the elastic elements with the retaining plates, fixing the retaining plates in place.

[0007] Preferably, the enclosure panel is a precast reinforced concrete panel or a steel panel, which can maximize quality assurance and reduce production costs.

[0008] Preferably, the support column and the movable plate are respectively provided with two protrusions on their respective sides close to each other. The two protrusions are respectively provided on both sides of the corresponding partition. The two ends of the enclosure plate are respectively provided with connecting grooves that fit with the protrusions. The U-shaped structure design can increase the sealing performance.

[0009] Preferably, a sealing gasket is fixedly provided on the side of the protrusion near the enclosure panel to increase the sealing performance and prevent water from the edge of the pit from seeping into the pit.

[0010] Preferably, a reinforcing plate is fixedly installed at the bottom of the support column on the side away from the movable plate, and the bottom surface of the reinforcing plate intersects with the ground to further reinforce the support column.

[0011] Preferably, a concrete baffle is provided between adjacent support columns. The concrete baffle is located at the bottom of the retaining panel and is provided with a receiving groove for loading the retaining panel. It is used to install and support the retaining panel, and a U-shaped structure is used to increase the sealing performance.

[0012] Preferably, the support column has a plurality of connecting mechanisms arranged longitudinally in an array corresponding to the position of the protrusion. The connecting mechanism includes an inner tube fixedly disposed in the support column, a sleeve slidably sleeved on the inner tube, and an elastic element sleeved on the inner tube. The two ends of the elastic element are respectively fixedly disposed on the inner tube and the sleeve. The end of the sleeve away from the inner tube passes through the protrusion and is fixedly connected to the movable plate. Under the action of the elastic element, the connecting mechanism can separate the movable plate and the support column during erection, which facilitates the installation of the enclosure panel.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model uses precast reinforced concrete slabs or steel plates as enclosure panels to ensure quality and reduce production costs. Support columns provide support for the enclosure structure. A movable plate allows for easy and quick installation; during installation, the enclosure panel is directly lifted and inserted between the movable plate and the support column, with the bottom inserted into the receiving groove. Due to the elastic element in the connecting mechanism, there is sufficient gap between the movable plate and the support column for easy hoisting. During use, the soil and rocks at the edge of the pit compress the enclosure panel and the movable plate, causing the movable plate to compress the elastic element and fit tightly against the enclosure panel. The protrusions on the movable plate and the support column insert into the connecting groove, and the sealing gaskets on the protrusions prevent moisture from the soil and rocks from seeping through the connection point of the enclosure panel, i.e., the support column location, significantly improving construction efficiency. Attached Figure Description

[0015] Figure 1 This is a front view of the present utility model;

[0016] Figure 2 This is a rear view of the present invention;

[0017] Figure 3 This is a top view of the support column position of this utility model;

[0018] Figure 4 This is a cross-sectional view of the location of the enclosure panel of this utility model;

[0019] Figure 5 This is a cross-sectional view of the support column location of this utility model;

[0020] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0021] In the diagram: 1. Support column; 11. Divider; 12. Base; 13. Protrusion; 14. Sealing gasket; 15. Reinforcing plate; 2. Enclosure panel; 21. Connecting groove; 3. Moving plate; 4. Concrete baffle; 41. Receiving groove; 5. Connecting mechanism; 51. Inner tube; 52. Sleeve; 53. Elastic element. Detailed Implementation

[0022] 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.

[0023] This utility model provides an embodiment of a foundation pit retaining structure, as shown in the reference. Figures 1 to 4 The invention includes several support columns 1 arranged in an array along the slope of the foundation pit and retaining plates 2 arranged between adjacent support columns 1. The invention is characterized in that: the support columns 1 extend into the ground and are fixedly connected to the pile foundation; the support columns 1 are longitudinally provided with a partition 11 for separating the retaining plates 2 on the side near the slope; a base 12 is provided on the support column 1 at the bottom of the partition 11; and a movable plate 3 is slidably connected to the base 12, which is close to or away from the retaining plates 2.

[0024] Furthermore, refer to Figures 1 to 4 The enclosure panel 2 is a precast reinforced concrete panel or a steel panel.

[0025] Furthermore, refer to Figure 3 The support column 1 and the movable plate 3 are respectively provided with two protrusions 13 on one side close to each other. The two protrusions 13 are respectively provided on both sides of the corresponding partition 11. The two ends of the enclosure plate 2 are respectively provided with connecting grooves 21 that fit with the protrusions 13.

[0026] It should be noted that, referring to Figure 3 A sealing gasket 14 is fixedly installed on the side of the protrusion 13 near the enclosure panel 2.

[0027] It is worth noting that, referring to Figures 1 to 4 A reinforcing plate 15 is fixedly installed at the bottom of the support column 1 on the side away from the movable plate 3, and the bottom surface of the reinforcing plate 15 meets the ground.

[0028] Furthermore, refer to Figure 4 A concrete baffle 4 is provided between adjacent support columns 1. The concrete baffle 4 is located at the bottom of the retaining plate 2. A receiving groove 41 for loading the retaining plate 2 is provided on the concrete baffle 4.

[0029] Furthermore, refer to Figures 5 to 6 Inside the support column 1, a number of connecting mechanisms 5 are arranged in a longitudinal array corresponding to the protrusion 13. The connecting mechanism 5 includes an inner tube 51 fixedly installed inside the support column 1, a sleeve 52 slidably sleeved on the inner tube 51, and an elastic member 53 sleeved on the inner tube 51. The two ends of the elastic member 53 are respectively fixedly installed on the inner tube 51 and the sleeve 52. The end of the sleeve 52 away from the inner tube 51 passes through the protrusion 13 and is fixedly connected to the moving plate 3.

[0030] Working principle: Support column 1 is set along the slope and its bottom is fixedly connected to the pile foundation, providing sufficient support for the foundation pit retaining structure. During the erection of this retaining structure, the retaining panel 2 is lifted and directly inserted between the movable panel 3 and the support column 1, with its bottom inserted into the receiving groove 41. The concrete baffle 4 can support the retaining panel 2 at the bottom, and a U-shaped structure is used to increase the sealing performance. As the most used component in the retaining structure, the retaining panel 2 can be made of precast reinforced concrete or steel as needed. It can be manufactured and processed in the factory and transported to the construction site to ensure quality and reduce production costs to the greatest extent. During the erection of the retaining structure... Due to the action of the elastic element 53, there is a sufficient gap between the movable plate 3 and the support column 1 to facilitate hoisting. During the erection and use process, the soil and rocks at the edge of the foundation pit squeeze the retaining plate 2 and the movable plate 3. The movable plate 3 is compressed by the elastic element 53 and fits tightly with the retaining plate 2. The protrusions 13 on the movable plate 3 and the support column 1 are inserted into the connecting groove 21. The sealing gasket 14 on the protrusion 13 prevents water in the soil and rocks from seeping through the connection of the retaining plate 2, i.e. the support column 1. If there is a gap between the retaining plate 2 and the concrete baffle 4 that causes water to seep in, grouting can be injected into the receiving groove 41 to seal it. The reinforcing plate 15 can further prevent the support column 1 from tilting under pressure.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foundation pit retaining structure, comprising a plurality of support columns (1) arranged in an array along the slope of the foundation pit and retaining plates (2) disposed between adjacent support columns (1), characterized in that: The support column (1) extends into the ground and is fixedly connected to the pile foundation. The support column (1) has a partition (11) on the side near the slope for separating the retaining plate (2). A base (12) is provided on the support column (1) at the bottom of the partition (11). A movable plate (3) that is close to or away from the retaining plate (2) is slidably connected to the base (12).

2. The foundation pit retaining structure according to claim 1, characterized in that: The enclosure panel (2) is a precast reinforced concrete panel or a steel panel.

3. The foundation pit retaining structure according to claim 2, characterized in that: The support column (1) and the movable plate (3) are respectively provided with two protrusions (13) on one side close to each other. The two protrusions (13) are respectively provided on both sides of the corresponding partition (11). The two ends of the enclosure plate (2) are respectively provided with connecting grooves (21) that fit with the protrusions (13).

4. The foundation pit retaining structure according to claim 3, characterized in that: A sealing gasket (14) is fixedly provided on the side of the protrusion (13) near the enclosure panel (2).

5. The foundation pit retaining structure according to claim 4, characterized in that: A reinforcing plate (15) is fixedly installed at the bottom of the side of the support column (1) away from the moving plate (3), and the bottom surface of the reinforcing plate (15) is connected to the ground.

6. The foundation pit retaining structure according to claim 5, characterized in that: A concrete baffle (4) is provided between adjacent support columns (1). The concrete baffle (4) is located at the bottom of the enclosure panel (2). The concrete baffle (4) is provided with a receiving groove (41) for loading the enclosure panel (2).

7. The foundation pit retaining structure according to claim 6, characterized in that: The support column (1) has a plurality of connecting mechanisms (5) arranged longitudinally in the position corresponding to the protrusion (13). The connecting mechanism (5) includes an inner tube (51) fixedly installed in the support column (1), a sleeve (52) slidably sleeved on the inner tube (51), and an elastic element (53) sleeved on the inner tube (51). The two ends of the elastic element (53) are fixedly installed on the inner tube (51) and the sleeve (52) respectively. The end of the sleeve (52) away from the inner tube (51) passes through the protrusion (13) and is fixedly connected to the moving plate (3).

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