Soil nailing wall supporting structure suitable for foundation pit around existing underground structure

Abstract

The utility model discloses a soil nailing wall supporting structure suitable for a foundation pit around an existing underground structure, which belongs to the technical field of foundation pit supporting and comprises a first supporting assembly and a second supporting assembly. The first supporting assembly comprises a plurality of first soil nails extending in the first direction, one end of each first soil nail is arranged on the top end face of a soil layer around the foundation pit, and the other end of each first soil nail is nailed into the soil layer around the foundation pit; a connecting beam is arranged between the two first soil nails; the second supporting assembly comprises second soil nails, one end of each second soil nail is arranged on the slope surface of the foundation pit slope, and the other end of each second soil nail extends towards the existing underground structure. The soil nailing wall supporting structure suitable for the foundation pit on the periphery of the existing underground structure can adapt to the situation that other buildings exist on the periphery of the foundation pit, it can be guaranteed that a slope body of the foundation pit is stably and effectively supported, the excavation depth of the foundation pit is increased, the engineering cost of foundation pit slope supporting can be reduced, and the construction period of the foundation pit slope supporting can be shortened.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit support technology, specifically relating to a soil nailing wall support structure suitable for foundation pits around existing underground structures. Background Technology

[0002] Traditional soil nailing walls utilize the soil's self-stabilizing capacity to excavate in stages, and then insert soil nails such as steel pipes, structural steel, and reinforcing bars into the pit wall soil in stages as excavation progresses. Finally, a steel mesh is hung on the excavation surface and shotcrete is sprayed to form a protective face. This fully utilizes the soil's strength and self-stabilizing capacity, while also taking advantage of the soil nails' pull-out and shear resistance to improve the slope's stability and ensure the safety of the foundation pit slope.

[0003] Existing soil nailing walls are typically suitable for environments with relatively open sites and where deformation requirements around the soil nailing wall are not strict. However, when there are underground structures, dense piles, or dense underground pipelines around the foundation pit, existing soil nailing wall structures usually cannot ensure the stability of the foundation pit in the presence of other building structures around it. Utility Model Content

[0004] In response to one or more of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a soil nailing wall support structure suitable for foundation pits around existing underground structures. It can adapt to the situation where there are other buildings around the foundation pit, and can not only ensure the stable and effective support of the foundation pit slope and increase the excavation depth of the foundation pit, but also significantly reduce the engineering cost and construction period of foundation pit slope support.

[0005] To achieve the above objectives, this utility model provides a soil nailing wall support structure suitable for foundation pits surrounding existing underground structures, used for stabilizing the slope of the foundation pit, comprising:

[0006] The first support component includes a plurality of first soil nails extending along a first direction. One end of each first soil nail is arranged on the top surface of the soil layer surrounding the foundation pit, and the other end of each first soil nail extends along the first direction and is driven into the soil layer surrounding the foundation pit. A connecting beam is provided between at least two first soil nails.

[0007] The second support component includes a plurality of second soil nails, one end of each second soil nail being disposed on the slope surface of the foundation pit slope, and the other end of each second soil nail extending toward the existing underground structure.

[0008] As a further preferred embodiment of the present invention, an existing underground structure is provided on at least one side of the foundation pit, and each of the first soil nails in the first support assembly is arranged sequentially at intervals along the extension direction of the foundation pit side to form at least one layer of advanced support in the soil layer surrounding the foundation pit.

[0009] As a further preferred embodiment of this utility model, the connecting beam connects the ends of several first soil nails along the extension direction of the foundation pit.

[0010] As a further preferred embodiment of the present invention, the connecting beam includes a concrete pouring beam arranged along the extension direction of the foundation pit edge, and the concrete pouring beam is fixedly connected to the top surface of each of the first soil nails.

[0011] As a further preferred embodiment of this invention, a cone-shaped part is provided at the end of the first soil nail that is inserted into the soil layer.

[0012] As a further preferred embodiment of this utility model, a concrete spraying layer is provided on the slope surface of the foundation pit and the top surface of the soil layer surrounding the foundation pit, and the concrete spraying layer completely covers the top surface of the soil layer surrounding the foundation pit and the slope surface.

[0013] As a further preferred embodiment of this invention, a hanging net is also provided on the slope to facilitate the spraying arrangement of the concrete spraying layer.

[0014] As a further preferred embodiment of this invention, the angle between the second soil nail and the horizontal plane is not less than 15 degrees and not greater than 35 degrees.

[0015] As a further preferred embodiment of this invention, the slope is a multi-level slope.

[0016] As a further preferred embodiment of this utility model, at least one drainage channel is provided on the bottom surface of the foundation pit.

[0017] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0018] (1) The present invention relates to a soil nailing wall support structure applicable to foundation pits surrounding existing underground structures, comprising a first support component and a second support component. The first support component comprises a plurality of first soil nails extending along a first direction, one end of each first soil nail being arranged on the top surface of the soil layer surrounding the foundation pit, and the other end of each first soil nail extending along the first direction and driven into the soil layer surrounding the foundation pit; and a connecting beam is provided between at least two first soil nails; the second support component comprises a plurality of second soil nails, one end of each second soil nail being arranged on the slope surface of the foundation pit, and the other end of each second soil nail extending toward the existing underground structure. This soil nailing wall support structure can adapt to situations where there are other buildings around the foundation pit, not only ensuring stable and effective support of the foundation pit slope and increasing the excavable depth of the foundation pit, but also significantly reducing the engineering cost and construction period of foundation pit slope support.

[0019] (2) The soil nailing wall support structure of this utility model, applicable to foundation pits around existing underground structures, significantly improves the stability of the advanced support structure formed by several first soil nails by setting a connecting beam parallel to the edge of the foundation pit on the top surface of the first soil nail. At the same time, by using several concrete-cast beams and several reinforcing bars in the connecting beam, and by welding and fixing the reinforcing bars to the first soil nail, the connecting beam can achieve stable fixation of the first soil nail, further improving the stability of the advanced support in the soil layer.

[0020] (3) The soil nailing wall support structure of this utility model, applicable to foundation pits surrounding existing underground structures, has a simple structure, stable support, and convenient construction. It involves arranging at least one row of vertically extending first soil nails parallel to the edge of the foundation pit in the soil layer between the foundation pit slope and the existing underground structure. This allows the several rows of advanced support systems formed by the first soil nails to provide stable support to the soil layer surrounding the foundation pit. Consequently, the second soil nails can ensure the stability of the soil layer surrounding the foundation pit while minimizing their length, thus reducing the relative distance between the foundation pit and the existing underground structure. Furthermore, the advanced support provided by the first soil nails in the soil layer surrounding the foundation pit ensures the stability of the surrounding soil layer, thereby maximizing the excavation depth of the foundation pit while maintaining stability. This structure has good promotional value and application prospects. Attached Figure Description

[0021] Figure 1 This is a vertical sectional view of a soil nailing wall support structure applicable to the foundation pit surrounding an existing underground structure in this embodiment of the utility model.

[0022] Figure 2 This is a top view of a soil nailing wall support structure applicable to the foundation pit surrounding existing underground structures in this embodiment of the utility model.

[0023] Figure 3 This is a partial enlarged view of point A in an embodiment of the present invention, showing a soil nailing wall support structure applicable to foundation pits surrounding existing underground structures.

[0024] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0025] 1. First soil nail; 2. Concrete pouring beam; 3. Conical head; 4. Reinforcing steel bar; 5. Second soil nail; 6. Mesh-lined concrete surface layer; 7. Upturned concrete surface layer; 8. Buildings in the foundation pit; 9. Existing underground structures; 10. Drainage ditch; 11. Soil layer. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] Example:

[0032] Please see Figures 1-3 The soil nailing wall support structure in the preferred embodiment of this utility model, which is suitable for foundation pits around existing underground structures, can adapt to the situation where there are other buildings around the foundation pit. It can not only ensure the stable and effective support of the foundation pit slope and increase the excavation depth of the foundation pit, but also significantly reduce the engineering cost and construction period of foundation pit slope support.

[0033] Specifically, in a preferred embodiment of this application, the soil nailing wall support structure is disposed in the soil layer 11 surrounding the foundation pit. This soil nailing wall support structure includes a first support component and a second support component. The first support component includes a plurality of first soil nails 1 extending along a first direction. One end of each first soil nail 1 is positioned on the top surface of the soil layer 11 surrounding the foundation pit, and the other end of each first soil nail 1 extends along the first direction to be driven into the soil layer 11 surrounding the foundation pit. This process, by driving the first soil nails 1 into the foundation pit, forms advanced support for the foundation pit, improves the stability of the soil layer 11 surrounding the foundation pit, and prevents deep slippage and damage to the soil nailing wall. Simultaneously, at least two first soil nails 1 are connected by a connecting beam, allowing at least a portion of the first soil nails 1 in the first support component to form an integral structure, further enhancing the advanced support performance of the first support component.

[0034] Furthermore, the second support component includes several second soil nails 5, one end of each second soil nail 5 being arranged on the slope surface of the foundation pit, and the other end of each second soil nail 5 extending towards the existing underground structure 9. Because several first soil nails 1 extending in the first direction are arranged in the soil layer 11 surrounding the foundation pit, the advanced support formed by the first soil nails 1 for the surrounding soil layer 11 allows the second soil nails 5 to minimize their extension length while ensuring stable support for the slope, thereby ensuring that the foundation pit is as close as possible to the existing underground structure 9.

[0035] It is worth noting that in the preferred embodiment of this application, the first direction is a direction that is perpendicular to or vertical to the horizontal plane, while the extension direction of the second soil nail 5 intersects the slope surface.

[0036] Furthermore, in a preferred embodiment of this application, an existing underground structure 9 is provided on at least one side of the foundation pit. Correspondingly, each of the first soil nails 1 in the first support assembly is arranged in parallel along the extension direction of the foundation pit side to form at least one layer of advanced support system in the soil layer 11 around the foundation pit.

[0037] Further preferably, in a specific preferred embodiment of this application, an underground structure is provided on one side of the foundation pit. Correspondingly, the first soil nails 1 of the first support component are arranged sequentially at intervals along the extension direction of the foundation pit edge. At the same time, a row of advanced support structures composed of the first soil nails 1 is formed in the soil layer 11 surrounding the foundation pit, thereby ensuring that the first support component can form stable support for the soil layer 11 surrounding the foundation pit. Preferably, the distance between two adjacent first soil nails 1 is not less than 1000mm and not more than 3000mm.

[0038] Of course, the arrangement of each first soil nail 1 in the first support component is not limited to the above-mentioned structural form. In another preferred embodiment of this application, each first soil nail 1 in the first support component is arranged in an array at the end of the top surface of the foundation pit, that is, several rows of advanced support systems can be formed on the top surface of the foundation pit, further improving the stability of the advanced support of the soil layer 11 around the foundation pit.

[0039] Furthermore, in a preferred embodiment of this application, the connecting beam connects the ends of several first soil nails 1 along the extension direction of the foundation pit. Specifically, several first soil nails 1 of the first support assembly are arranged at intervals along the extension direction of the foundation pit to form a row of advanced support structures, and the first soil nails 1 are fixedly connected to the top of each first soil nail 1 through the connecting beam, thereby forming a stable advanced support system composed of each first soil nail 1 in the soil layer 11.

[0040] More preferably, in the preferred embodiment of this application, the connecting beam includes a concrete pouring beam 2 arranged along the extension direction of the foundation pit. Each concrete pouring beam 2 is fixedly connected to the top surface of each first soil nail 1. Correspondingly, a pouring groove is opened on the top surface of the soil layer 11 around the foundation pit. The ends of each first soil nail 1 are all set in the pouring groove. At the same time, the concrete pouring beam 2 is arranged in the pouring groove so that the concrete pouring beam 2 can achieve a stable connection with the first soil nail 1.

[0041] More specifically, in a preferred embodiment of this application, at least one reinforcing steel bar 4 is also arranged within the connecting beam. Each reinforcing steel bar 4 is arranged on both sides of the end of each first soil nail 1, and each reinforcing steel bar 4 is fixedly connected to the top of each first soil nail 1, further improving the stability of the first soil nail 1. Preferably, at least one reinforcing steel bar 4 is arranged on both sides of the first soil nail 1, and the reinforcing steel bar 4 is welded and fixed to the top of the first soil nail 1, thereby improving the stability of the advanced support system in the soil layer 11.

[0042] Of course, the arrangement of the connecting beams is not limited to the above-mentioned structural form. In another preferred embodiment of this application, a connecting beam is also provided between the two rows of first soil nails 1 parallel to the edge of the foundation pit. Preferably, the extension direction of the connecting beam is perpendicular to the edge of the foundation pit, thereby forming a mesh support system on the top surface of the soil layer 11 around the foundation pit.

[0043] Furthermore, in a preferred embodiment of this application, a cone head 3 is provided at the end of the first soil nail 1 that is inserted into the soil layer 11, thereby ensuring that the first soil nail 1 can be easily driven into the soil layer 11. Preferably, the cone head 3 at the end of the first soil nail 1 is welded or threaded.

[0044] More preferably, in the preferred embodiment of this application, a concrete spraying layer is provided on both the slope surface of the foundation pit and the top surface of the soil layer 11 surrounding the foundation pit, and the concrete spraying layer completely covers the top surface of the soil layer 11 surrounding the foundation pit and the slope surface, further improving the stability of the slope and the soil layer 11 surrounding the foundation pit.

[0045] More specifically, in a preferred embodiment of this application, an upturned concrete surface layer 7 is arranged on the top surface of the soil layer 11 surrounding the foundation pit. Preferably, the concrete strength of the upturned concrete surface layer 7 is C25 to C40. Correspondingly, a wire mesh concrete surface layer 6 is provided on the slope of the foundation pit. Preferably, the concrete strength of the wire mesh concrete surface layer 6 is C20 to C30. Specifically, a wire mesh is provided on the slope of the foundation pit, and a concrete surface layer is arranged on the wire mesh on the slope, thus forming the wire mesh concrete surface layer 6 on the slope. Preferably, the wire mesh is a steel mesh or a steel plate mesh. More preferably, the thickness of the upturned concrete surface layer 7 and the wire mesh concrete surface layer 6 is not less than 60 mm and not more than 150 mm.

[0046] Further, in a preferred embodiment of this application, the angle between the second soil nail 5 and the horizontal plane is not less than 15 degrees and not more than 35 degrees. Preferably, the second soil nail 5 is not positioned at the end of the soil layer 11 but is arranged obliquely upwards, thereby ensuring the stability of the slope. More preferably, the horizontal distance between two adjacent second soil nails 5 is not greater than 1000 mm and not less than 3000 mm, and the vertical distance between two adjacent second soil nails 5 is not greater than 1000 mm and not less than 3000 mm. More preferably, the first soil nail 1 and the second soil nail 5 are ordinary soil nails and prestressed soil nail structures, respectively.

[0047] More preferably, in the preferred embodiment of this application, one end of the second soil nail 5 is driven into the soil layer 11, and correspondingly, the other end of the second soil nail 5 extends out of the wire mesh concrete surface layer 6.

[0048] Furthermore, in a preferred embodiment of this application, the slope is a multi-level slope, and the slope of each level of the slope decreases sequentially from the top of the pit to the bottom of the pit.

[0049] Further preferably, in a preferred embodiment of this application, at least one drainage ditch 10 is provided on the bottom surface of the foundation pit. Preferably, an internal structure 8 is provided inside the foundation pit.

[0050] This utility model presents a soil nailing wall support structure for foundation pits surrounding existing underground structures. The structure is simple, provides stable support, and is easy to construct. It involves arranging at least one row of vertically extending first soil nails 1 parallel to the edge of the foundation pit in the soil layer 11 between the foundation pit slope and the existing underground structure 9. This creates a pre-support system that provides stable support to the surrounding soil layer 11. Consequently, the length of the second soil nails 5 is minimized while ensuring the stability of the surrounding soil layer 11, thus reducing the relative distance between the foundation pit and the existing underground structure 9. Furthermore, the pre-support provided by the first soil nails 1 in the surrounding soil layer 11 ensures the stability of the soil layer 11, allowing the foundation pit to maintain stability while maximizing its excavation depth. This design has significant potential for widespread application and widespread adoption.

[0051] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A soil nailing wall support structure suitable for foundation pits surrounding existing underground structures, used for stabilizing the slope of the foundation pit, characterized in that, include: The first support component includes a plurality of first soil nails extending along a first direction. One end of each first soil nail is arranged on the top surface of the soil layer surrounding the foundation pit, and the other end of each first soil nail extends along the first direction and is driven into the soil layer surrounding the foundation pit. A connecting beam is provided between at least two first soil nails. The second support component includes a plurality of second soil nails, one end of each second soil nail being disposed on the slope surface of the foundation pit slope, and the other end of each second soil nail extending toward the existing underground structure.

2. The soil nailing wall support structure applicable to foundation pits surrounding existing underground structures according to claim 1, wherein, At least one side of the foundation pit is provided with an existing underground structure, and each of the first soil nails in the first support assembly is arranged at intervals along the extension direction of the foundation pit side to form at least one layer of advanced support in the soil layer around the foundation pit.

3. The soil nailing wall support structure applicable to foundation pits surrounding existing underground structures according to claim 2, wherein, The connecting beam extends along the edge of the foundation pit and connects the ends of several of the first soil nails.

4. The soil nailing wall support structure applicable to foundation pits surrounding existing underground structures according to claim 3, wherein, The connecting beam includes a concrete pouring beam arranged along the extension direction of the foundation pit edge, and the concrete pouring beam is fixedly connected to the top surface of each of the first soil nails.

5. The soil nailing wall support structure applicable to the foundation pit surrounding existing underground structures according to any one of claims 1 to 4, wherein, A cone-shaped head is provided at the end of the first soil nail that is inserted into the soil layer.

6. The soil nailing wall support structure applicable to the foundation pit surrounding existing underground structures according to any one of claims 1 to 4, wherein, The slope of the foundation pit and the top surface of the soil layer surrounding the foundation pit are both covered with a concrete spraying layer, which completely covers the top surface of the soil layer surrounding the foundation pit and the slope.

7. The soil nailing wall support structure applicable to foundation pits surrounding existing underground structures according to claim 6, wherein, A hanging net is also installed on the slope to facilitate the spraying of the concrete spraying layer.

8. The soil nailing wall support structure applicable to the foundation pit surrounding existing underground structures according to any one of claims 1 to 4 and 7, wherein, The angle between the second soil nail and the horizontal plane shall be no less than 15 degrees and no more than 35 degrees.

9. The soil nailing wall support structure applicable to the foundation pit surrounding existing underground structures according to any one of claims 1 to 4 and 7, wherein, The slope is a multi-level slope.

10. The soil nailing wall support structure applicable to the foundation pit surrounding existing underground structures according to any one of claims 1 to 4 and 7, wherein, At least one drainage ditch is provided on the bottom surface of the foundation pit.

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