Supporting structure for loess foundation pit

Abstract

The utility model discloses a supporting structure for a loess foundation pit. The supporting structure comprises a concrete cushion layer poured at the bottom of the loess foundation pit. The stand columns are tightly attached to the edge of a foundation pit and inserted into a concrete cushion layer, and the cross beams are connected with the adjacent stand columns and fixed through stand column joints. Wherein the stand column assembly is provided with a connecting body, and the cross beam is provided with a connecting hole matched with the connecting body. The stand column joint is of a special-shaped hexahedron structure and comprises a limiting plate, a side plate, a connecting plate and a fixing block. The supporting node comprises a tripod and a U-shaped hoop. The bottom ends of the stand columns and the supporting columns are wrapped with plastic films. The utility model provides a more efficient, environment-friendly and economical solution for loess foundation pit support.

Description

Technical Field

[0001] The utility model belongs to the field of geotechnical engineering, and particularly relates to a support structure for a loess foundation pit. Background Technique

[0002] Due to its unique verticality, loess can maintain a steep slope or a free face close to 90° in its natural state, which is very beneficial for engineering applications. However, in the design of foundation pit support in loess areas, commonly used methods such as row piles, anchor bolts, and soil nailing walls do not fully utilize this vertical property of loess. Although these traditional support methods have a wide range of applications, they may not be optimized for the characteristics of loess, resulting in over-design of the support structure and waste of resources.

[0003] In addition, the construction process of traditional support structures often relies on large-scale mechanical equipment, which not only increases the complexity of construction but also requires a large operating space. In the current urban environment, due to the scarcity of land resources and limited construction sites, it is difficult for these large-scale machines to find enough space for activities near the foundation pit, thus bringing many inconveniences to construction. More disadvantageously, once the construction is completed and the foundation pit is backfilled, most of the support structures cannot be recycled and can only be permanently buried underground, which is not only a waste of resources but also poses potential environmental pollution problems and is not conducive to sustainable urban construction and the effective utilization of underground space. Summary of the Invention

[0004] The purpose of the embodiment of the utility model is to provide a support structure for a loess foundation pit, which is designed for a loess foundation pit and solves the technical problems of non-disassembly and non-recyclability of the existing support structure.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is that a support structure for a loess foundation pit is arranged in a loess foundation pit and includes:

[0006] A concrete cushion, which is poured at the bottom of the loess foundation pit;

[0007] Columns, which are inserted into the concrete cushion close to the edge of the loess foundation pit; the columns are composed of multiple column components spliced together, column joints are arranged between adjacent column components, and adjacent columns are connected by cross beams;

[0008] Support columns, which are vertically inserted into the concrete cushion inside the loess foundation pit;

[0009] Support beams, which are horizontally arranged in the loess foundation pit, with both ends inserted into the column joints respectively, and the support beams are also fixed to the support columns through support joints.

[0010] Further, the column assembly is a circular column or a square column. Two connectors with lengths less than that of the column assembly are provided at the center of the outer wall. One side of each connector is a flat surface, and a protrusion for limiting is provided at the center of the other side. The setting direction of the protrusion is the same as that of the column assembly, and the convex surface shape fits the side wall of the column. Screw holes are provided on the flat surfaces on both sides of the protrusion of the connector.

[0011] Further, the cross beam is an H-shaped steel or an I-shaped steel beam. A connection hole with a circular or square cross-section matching the side cross-section of the column assembly is provided at one end, and the connection hole structure of the other end fits the connection hole of the adjacent cross beam member; the thickness of the cross beam is equal to the length difference between the connector and the column assembly.

[0012] Further, a baffle is also provided between adjacent columns; the baffle is a rectangular steel plate with a thickness of 10 - 20 mm, and bolt holes matching the connectors are opened on both sides. The lengths of the two sides with bolt holes are the same as the length of the connector of the column assembly; the lengths of the two sides without bolt holes are the same as the distance between adjacent two columns.

[0013] Further, the cross beam and the column assembly are fixed through a column node; the column node is a special-shaped hexahedron welding structure. One side is an open structure, and the side corresponding to the open side is a limiting plate. The limiting plate is a rectangular plate member with an arch groove provided in the middle, and the shape of the arch groove is the same as the shape of the outer wall of the column;

[0014] The column node further includes two side plates, which are arranged on both sides of the limiting plate where the arch groove is not provided. The side plates are rectangular plates, and a fixing block is provided on the inner wall of each side plate near the opening of the column node;

[0015] The column node further includes two connecting plates. The connecting plates are L-shaped bent plates. The horizontal part of the connecting plate near the bending part is an open structure, and the shape of the open structure matches the shape of the outer wall of the column. The vertical part of the connecting plate extends outward from the column node along the bending part, and screw holes are provided on the vertical part of the connecting plate.

[0016] Further, the fixing block is a rubber buffer block. The bottom surface of the fixing block closely adheres to the side plate, and the top surface matches the outer wall contour of the support beam. Screw holes and matching fastening screws are provided on the side plate at the position of the fixing block.

[0017] Further, at the open end of the column node, the side plates, the connecting plates, and the fixing blocks are flush, and the length from the bending part of the connecting plate to the edge of the side plate is equal to or greater than the width of the cross beam.

[0018] Further, a transverse protrusion is provided on the horizontal part of the inner connecting plate of the column node.

[0019] Further, the support node includes a tripod and a U-shaped hoop. The vertical part of the tripod is fixed on the support column, and the U-shaped hoop is arranged on the horizontal part. The support beam passes through the U-shaped hoop and extends to the column node. The U-shaped hoop fixes the support beam on the tripod with screws.

[0020] Further, the bottoms of the columns and the support columns are wrapped with plastic films.

[0021] The beneficial effects of the present utility model are as follows:

[0022] The present utility model solves the problems of the traditional loess foundation pit support structure being non-disassemblable and non-recyclable. By adopting a reusable light steel structure, it not only reduces the impact on the environment and avoids potential underground pollution problems, but also significantly reduces the overall project cost. The structure design of the present utility model is simple and efficient, and fully utilizes the self-standing characteristics of loess. An innovative integrated node reinforcement technology is adopted at the connection nodes, ensuring the high strength of the structural nodes and enhancing the stability of the entire support structure. The present utility model supports the operation mode of installing the support while excavating, greatly improving the working efficiency of the loess foundation pit support. In addition, since no large-scale mechanical equipment is required on-site, the construction process is more convenient, further improving the working efficiency. In summary, through a series of technical improvements and innovative designs, the present utility model provides a more efficient, environmentally friendly and economical solution for the loess foundation pit support. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the support structure of the loess foundation pit.

[0025] Figure 2 It is a schematic diagram of the column member.

[0026] Figure 3 It is a schematic diagram of the cross beam member.

[0027] Figure 4 It is a schematic diagram of the baffle.

[0028] Figure 5 It is a perspective view of the fixing structure of the column node.

[0029] Figure 6 It is a rear view of the fixing structure of the column node.

[0030] Figure 7 It is a schematic diagram of the fixed structure of the support node.

[0031] In the figure, 1 is the cross beam; 101 is the connection hole; 2 is the column node; 201 is the fastening screw; 202 is the connecting plate; 203 is the limiting plate; 204 is the fixing block; 205 is the side plate; 3 is the support beam; 4 is the support node; 401 is the tripod; 402 is the U-shaped hoop; 5 is the column, 501 is the column assembly; 502 is the connecting body; 6 is the support column; 7 is the plastic film; 8 is the concrete cushion; 9 is the baffle; 901 is the screw hole. Specific implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] As Figure 1 , this embodiment provides a detachable loess foundation pit support structure, which mainly includes a column 5, a support beam 3, a cross beam 1, a support column 6, a column node 2, a support node 4, and a baffle 9.

[0034] As Figure 2 , in some possible implementation manners, the column 5 is assembled by a plurality of column components 501. The column component 501 is a circular column body, and two connecting bodies 502 are arranged on the outer wall. One side of the connecting body 502 is a plane, and a convex portion for limiting is arranged on the other side. The setting direction of the convex portion is the same as that of the column 5, the convex surface shape fits the side wall of the column 5, and screw holes are arranged on both sides of the convex portion; according to the position of the column 5, the position of the connecting body 502 on the column component 501 can be set to meet the installation angle of the column component 501.

[0035] In some specific implementation manners, the length of the connecting body 502 is less than the circular column body part of the column component 501, and it is arranged at the center position of the side wall of the column component 501; the columns 5 are fixed by the cross beam 1.

[0036] As Figure 3 , in some possible implementation manners, the cross beam 1 is an H-shaped steel or an I-shaped steel beam. One end is provided with a connection hole 101 with a circular or square cross section matching the side cross section of the column 5, and the other end is attached to the end with the connection hole 101. The thickness of the cross beam 1 is equal to the length difference between the connecting body 502 and the column component 501 of the column component 501, which is convenient for both ends of the column component 501 to be inserted into the connection hole 101 inside the cross beam 1.

[0037] AsFigure 4 , in some possible embodiments, a baffle 9 is further provided between adjacent columns 5. The baffle 9 is a rectangular steel plate with a thickness of 10 - 20 mm. Bolt holes matching the connecting body 502 of the column assembly 501 are opened on both sides. The lengths of the two sides with bolt holes are the same as the length of the connecting body 502 of the column assembly 501; the lengths of the two sides without bolt holes are the same as the distance between two adjacent columns 5.

[0038] Such as Figure 5 , 6 , in some specific embodiments, adjacent columns 5 are connected by a cross beam 1 and fixed by a column node 2. The column node 2 is a special-shaped hexahedron welding structure, one of its faces is an open structure, and the face opposite to the opening is a limiting plate 203. The limiting plate 203 is a rectangular plate member with an arch groove, and the shape of the arch groove matches the outer wall shape of the column 5 to effectively limit the column 5.

[0039] The column node 2 further includes two side plates 205, which are located on both sides of the limiting plate 203 where the arch groove is not provided. These two side plates 205 are also rectangular plate members, and a fixing block 204 is provided on the inner wall of each side plate 205 near the opening of the column node 2. In this embodiment, the fixing block 204 is an elastic rubber buffer block; as long as the fixing block 204 has elasticity, any similar structure belongs to the scope of disclosure of this embodiment. The bottom surface of the fixing block 204 is in close contact with the side plate 205, and the top surface fits the outer wall contour of the support beam 3. The side plate 205 is provided with a screw hole 901 and a matching fastening screw 201 at the position of the fixing block 204. When the fastening screw 201 is tightened, the support beam 3 can be effectively locked.

[0040] In addition, the column node 2 further includes two connecting plates 202, which are L-shaped. The horizontal part of the connecting plate 202 near the bending part is an open structure, and the shape of the open structure matches the outer wall shape of the column 5. The vertical part of the connecting plate 202 extends outward along the bending part. In some specific embodiments, the vertical part is provided with a screw hole 901, and the column node 2 can be fixed on the baffle 9 through screws.

[0041] In some possible embodiments, the side plates 205, the connecting plates 202, and the fixing blocks 204 are flush at the open end of the column node 2, and the length from the bending part of the connecting plate 202 to the edge of the side plate 205 is equal to or greater than the width of the cross beam 1, ensuring that the installation of the column node 2 can be smooth and unobstructed during the installation of the cross beam 1.

[0042] In some possible embodiments, a transverse protrusion is provided on the horizontal part of the inner connecting plate 202 of the column 5 section to increase the friction of the fixing block 204, making the fixation between the column node 2 and the support beam 3 more firm.

[0043] As Figure 1 , in some possible embodiments, the column 5 is arranged close to the edge of the loess foundation pit, the support column 6 is vertically arranged inside the foundation pit, the support beam 3 is horizontally arranged, both ends of the support beam 3 are inserted into the openings of the column node 2 and fixed by the fixing block 204, and the support column 6 and the support beam 3 are fixed by the support node 4.

[0044] As Figure 6 , in some specific embodiments, the support node 4 includes a tripod 401 and a U-shaped hoop 402. The vertical part of the tripod 401 is fixed on the support column 6, the U-shaped hoop 402 is arranged on the horizontal part, and the support beam 3 passes through the U-shaped hoop 402 and extends to the column node 2; the U-shaped hoop 402 fixes the support beam 3 on the tripod 401 by screws.

[0045] As Figure 1 , in some possible embodiments, a concrete cushion 8 is poured at the bottom of the foundation pit. The bottom ends of the column 5 and the support column 6 are wrapped with a plastic film 7 and inserted into the concrete cushion 8, which is convenient for directly extracting from the concrete cushion 8 when demolishing the support structure.

[0046] When the support structure in this embodiment is constructed and disassembled, before the backfill soil is carried out after the foundation pit excavation is completed, the bolts at each node are sequentially opened to remove each component for the next use of the foundation pit support.

[0047] Due to the self-standing property of the loess itself, traditional support structures usually need to set horizontal support measures inside the loess, such as soil nail walls or anchor bolts, etc. In this embodiment, a light steel structure is adopted, which can make full use of the natural self-standing performance of the loess and does not require additional support members to be driven into the loess, thus simplifying the construction process and improving the efficiency.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A support structure for a loess foundation pit, arranged in a loess foundation pit, characterized in that: include: A concrete cushion layer (8) is poured at the bottom of the loess foundation pit; The columns (5) are inserted into the concrete cushion layer (8) close to the edge of the loess foundation pit; the columns (5) are formed by splicing a plurality of column assemblies (501), column nodes (2) are arranged between adjacent column assemblies (501), and adjacent columns (5) are connected by crossbeams (1); A support column (6) is vertically inserted into a concrete cushion layer (8) inside the loess foundation pit; The support beam (3) is horizontally arranged in the loess foundation pit, and both ends are respectively inserted into the column nodes (2). The support beam (3) is also fixed to the support column (6) through the support node (4).

2. A supporting structure for loess foundation pit according to claim 1, characterized in that: The column assembly (501) is a circular column or a square column, and two connectors (502) whose length is shorter than that of the column assembly (501) are arranged at the center of the outer wall. One side of the connector (502) is a plane, and a protrusion for limiting is arranged at the center of the other side. The protrusion is arranged in the same direction as the column assembly (501), and the convex shape is in contact with the side wall of the column (5). Screw holes (901) are arranged on the planes on both sides of the protrusion of the connector (502).

3. A supporting structure for loess foundation pit according to any one of claims 1 or 2, characterized in that: The crossbeam (1) is an H-shaped steel or I-shaped steel beam, one end of which is provided with a connection hole (101) with a circular or square cross section matching the side cross section of the column assembly (501), and the other end of which is structurally fitted with the connection hole (101) of an adjacent crossbeam (1) component; the thickness of the crossbeam (1) is equal to the length difference between the connector (502) and the column assembly (501).

4. A supporting structure for loess foundation pit according to any one of claims 1 or 2, characterized in that: A baffle (9) is also provided between adjacent columns (5); the baffle (9) is a rectangular steel plate with a thickness of 10 to 20 mm, with bolt holes matching the connector (502) formed on both sides, the length of the two sides with the bolt holes being the same as the length of the connector (502) of the column assembly (501); the length of the two sides without the bolt holes being the same as the distance between two adjacent columns (5).

5. The supporting structure for loess foundation pit according to claim 3, characterized in that: The cross beam (1) and the column assembly (501) are fixed via a column node (2); the column node (2) is a special-shaped hexahedral welded structure, one side of which is an open structure, and the side corresponding to the opening is a limit plate (203), the limit plate (203) is a rectangular plate with an arch groove in the middle, and the shape of the arch groove is the same as the shape of the outer wall of the column (5); The column node (2) further comprises two side plates (205) which are arranged on both sides of the limiting plate (203) where the arch groove is not arranged, the side plates (205) being rectangular plates, and a fixing block (204) is arranged on the inner wall of each side plate (205) close to the opening of the column node (2); The column node (2) further comprises two connecting plates (202), wherein the connecting plates (202) are L-shaped bent plates, wherein the horizontal portion of the connecting plates (202) is an open structure near the bend, wherein the shape of the open structure matches the shape of the outer wall of the column (5), and the vertical portion of the connecting plates (202) extends along the bend toward the outside of the column node (2), and the vertical portion of the connecting plates (202) is provided with screw holes (901).

6. A supporting structure for loess foundation pit according to claim 5, characterized in that: The fixing block (204) is a rubber buffer block. The bottom surface of the fixing block (204) is in close contact with the side plate (205), and the top surface matches the outer wall profile of the support beam (3). The side plate (205) is provided with a screw hole (901) and a matching fastening screw (201) at the position of the fixing block (204).

7. The supporting structure for loess foundation pit according to claim 5, characterized in that: At the open end of the column node (2), the side plate (205), the connecting plate (202) and the fixing block (204) are flush, and the length from the bent portion of the connecting plate (202) to the edge of the side plate (205) is equal to or greater than the width of the crossbeam (1).

8. The supporting structure for loess foundation pit according to claim 5, characterized in that: A transverse protrusion is provided on the horizontal portion of the internal connecting plate (202) of the column (5).

9. The supporting structure for loess foundation pit according to claim 1, characterized in that: The support node (4) comprises a tripod (401) and a U-shaped hoop (402); the vertical portion of the tripod (401) is fixed to a support column (6); the horizontal portion is provided with a U-shaped hoop (402); the support beam (3) passes through the U-shaped hoop (402) and extends to the column node (2); the U-shaped hoop (402) fixes the support beam (3) to the tripod (401) by means of screws.

10. The supporting structure for loess foundation pit according to claim 1, characterized in that: The bottom ends of the upright column (5) and the supporting column (6) are wrapped with a plastic film (7).

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