Foundation pit external corner supporting structure with inward and outward inclined piles

Abstract

The utility model provides a foundation pit external corner supporting structure with inward and outward inclined piles. The foundation pit external corner supporting structure comprises a fender post, a top beam is poured on the top of the fender post, the top beam comprises a connecting part, two inclined parts and two horizontal parts, the two horizontal parts are connected with two connecting beams, the bottoms of the two connecting beams are connected with a reinforced concrete slab, and the reinforced concrete slab is connected with the two inclined parts. The two connecting beams are connected with inclined beams, one ends of the inclined beams are connected with the connecting part, the bottoms of the corresponding connecting beams are connected with reinforced concrete piles, and two steel pipe piles are connected between the inclined beams. The foundation pit external corner supporting structure with the inward and outward inclined piles has the advantages that the novel foundation pit external corner supporting structure with large rigidity and strength is provided, deformation of the supporting structure at the position of the foundation pit external corner is reduced, disturbance influence of foundation pit excavation on surrounding soil is reduced, and stability of the supporting structure at the position of the foundation pit external corner is improved.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit corner support technology, and particularly relates to a foundation pit corner support structure containing inward and outward inclined piles. Background Technology

[0002] With the acceleration of urbanization in China, irregular foundation pits are becoming increasingly common, leading to a greater size effect in the support structure. In particular, the internal forces and stress concentration at the external corners of foundation pits are more complex. While ordinary slopes typically only form a single fracture surface, multiple free surfaces exist at the external corners, creating a fracture wedge and reducing the stability of the foundation pit.

[0003] The external corner of an excavation pit is a location prone to deformation, and the existence of the external corner effect restricts and influences the design and construction of the excavation pit support system, thus receiving increasing attention from the engineering community. Monitoring data on the horizontal displacement, settlement, and deep soil horizontal displacement of the top of the actual support structure in engineering projects reveals that the external corner of the excavation pit generates displacements in two mutually perpendicular directions. Furthermore, the external corner experiences the least soil constraint, resulting in greater displacement and deformation than the internal corner; the maximum deformation of the excavation pit occurs at the external corner. In particular, if there are existing buildings or structures nearby at the external corner of the excavation pit, the excavation must consider the protection of these adjacent buildings, placing higher demands on the deformation and stability of the retaining structure at the external corner.

[0004] Therefore, it is necessary to provide a new foundation pit corner support structure containing inward and outward inclined piles to solve the above-mentioned technical problems. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a new type of support structure for the external corner of a foundation pit that provides greater rigidity and strength, reduces the deformation of the support structure at the external corner of the foundation pit, reduces the disturbance to the surrounding soil caused by foundation pit excavation, and improves the stability of the support structure at the external corner of the foundation pit. This is a support structure for the external corner of the foundation pit that includes inward and outward inclined piles.

[0006] To solve the above-mentioned technical problems, the present invention provides a foundation pit corner support structure including inward and outward inclined piles, comprising: retaining piles, a capping beam cast on the top of the retaining piles, the capping beam including a connecting part, two inclined parts and two horizontal parts, two connecting beams connected to the two horizontal parts, reinforced concrete slabs connected to the bottom of the two connecting beams, inclined beams connected to the two connecting beams, one end of the inclined beams connected to the connecting part, and reinforced concrete piles connected to the bottom of the corresponding connecting beams, two steel pipe piles connected between the inclined beams, and grouting bodies connected to the bottom ends of the two steel pipe piles.

[0007] As a further embodiment of this utility model, the reinforced concrete pile and the two steel pipe piles are all located on the diagonal line outside the pit at the external corner of the foundation pit.

[0008] As a further embodiment of this utility model, a grouting pipe is provided inside the steel pipe pile, and the grouting body is located at the bottom of the grouting pipe.

[0009] As a further embodiment of this utility model, the angle between the reinforced concrete pile and the steel pipe pile and the vertical line is 10-30°.

[0010] As a further embodiment of this utility model, the crown beam, connecting beam and inclined beam are inclined into the pit along the diagonal of the sun angle, with the slope height-to-width ratio between 1:1 and 1:2.

[0011] Compared with related technologies, the foundation pit corner support structure with inward and outward inclined piles provided by this utility model has the following beneficial effects:

[0012] 1. The entire support structure at the external corner of the foundation pit is inclined inward along the diagonal of the external corner. The slope reduction reduces the lateral pressure of the soil at the external corner, thereby reducing the external load on the support structure and benefiting it.

[0013] 2. The lower end of the steel pipe pile is inclined towards the inside of the foundation pit, and the bottom of the steel pipe pile is equipped with grout. Under the deformation coupling effect of the foundation pit, the steel pipe pile can withstand a large pressure in the axial direction, which greatly improves the strength and rigidity of the foundation pit support structure at the external corner of the foundation pit.

[0014] 3. The steel pipe piles and reinforced concrete piles are located on the diagonal outside the pit at the external corner of the foundation pit. The steel pipe piles, reinforced concrete piles, connecting beams and foundation pit capping beams form multiple triangular stability systems. The overall rigidity of the support structure is large and the deformation at the external corner of the foundation pit is small. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 A top view schematic diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model;

[0017] Figure 2 A top-view perspective structural diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model;

[0018] Figure 3 A schematic diagram of the external diagonal section of the foundation pit corner, which includes an inwardly and outwardly inclined pile support structure, provided by this utility model.

[0019] Figure 4 A first three-dimensional structural schematic diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model;

[0020] Figure 5A second three-dimensional structural schematic diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model;

[0021] Figure 6 A partial structural schematic diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model;

[0022] Figure 7 A schematic diagram of the ground inside and outside the pit for the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model.

[0023] In the diagram: 1. Retaining pile; 2. Crown beam; 201. Connecting part; 202. Inclined part; 203. Horizontal part; 3. Connecting beam; 4. Reinforced concrete slab; 5. Inclined beam; 6. Reinforced concrete pile; 7. Steel pipe pile; 8. Grouting body. Detailed Implementation

[0024] Please refer to the following: Figures 1 to 7 ,in, Figure 1 A top view schematic diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model; Figure 2 A top-view perspective structural diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model; Figure 3 A schematic diagram of the external diagonal section of the foundation pit corner, which includes an inwardly and outwardly inclined pile support structure, provided by this utility model. Figure 4 A first three-dimensional structural schematic diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model; Figure 5 A second three-dimensional structural schematic diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model; Figure 6 A partial structural schematic diagram of the foundation pit corner support structure containing inward and outward inclined piles provided by this utility model; Figure 7 This utility model provides a schematic diagram of the ground surface inside and outside the foundation pit for a foundation pit corner support structure containing inward and outward inclined piles. The foundation pit corner support structure containing inward and outward inclined piles includes: retaining piles 1, with a capping beam 2 cast on the top of the retaining piles 1. The capping beam 2 includes a connecting part 201, two inclined parts 202, and two horizontal parts 203. Two connecting beams 3 are connected to the two horizontal parts 203. Reinforced concrete slabs 4 are connected to the bottom of the two connecting beams 3. Inclined beams 5 are connected to the two connecting beams 3. One end of the inclined beam 5 is connected to the connecting part 201. Reinforced concrete piles 6 are connected to the bottom of the corresponding connecting beams 3. Two steel pipe piles 7 are connected between the inclined beams 5. Grouting bodies 8 are connected to the bottom ends of the two steel pipe piles 7.

[0025] The reinforced concrete slab 4 is located between two connecting beams 3 perpendicular to the diagonal of the external corner of the foundation pit, connecting the connecting beams 3 to form a whole, which further improves the rigidity of the support structure. Moreover, the reinforced concrete slab 4 is constructed on the ground surface, which is convenient to construct and cost-effective.

[0026] The reinforced concrete pile 6 and the two steel pipe piles 7 are all located on the diagonal line outside the pit at the external corner of the foundation pit.

[0027] The construction of reinforced concrete piles 6 and steel pipe piles 7 located on the diagonal line of the external corner of the foundation pit and the foundation pit retaining piles 1 has minimal mutual influence and disturbance, thus achieving maximum protection for the soil outside the pit.

[0028] The steel pipe pile 7 is equipped with a grouting pipe, and the grouting body 8 is located at the bottom of the grouting pipe.

[0029] The angles between the reinforced concrete pile 6 and the steel pipe pile 7 and the vertical line are both 10-30°.

[0030] The reinforced concrete pile 6 is inclined at its lower end towards the outside of the foundation pit, and is classified as an "outward-inclined pile"; the steel pipe pile 7 is inclined at its lower end towards the inside of the foundation pit, and is classified as an "inward-inclined pile". Their directions are different, and therefore their stresses are also different. When the reinforced concrete pile 6, as an "outward-inclined pile", is in operation, it bears axial tensile force, and comprehensively undertakes the combined effects of tensile force, shear force, and bending moment; when the steel pipe pile 7, as an "inward-inclined pile", is in operation, it bears axial compressive force, and comprehensively undertakes the combined effects of compressive force, shear force, and bending moment.

[0031] The crown beam 2, connecting beam 3 and inclined beam 5 are inclined into the pit along the diagonal of the sun angle, with a slope height-to-width ratio between 1:1 and 1:2.

[0032] The working principle of the foundation pit corner support structure with inward and outward inclined piles provided by this utility model is as follows:

[0033] The first step: During construction, the overall design of the foundation pit support structure is carried out based on the engineering geological conditions, surrounding environment, and foundation pit parameters, including the support design at the external corner of the foundation pit. Specifically, the support design at the external corner of the foundation pit includes, in addition to the retaining piles 1 and the capping beam 2, the connecting beam 3, the reinforced concrete slab 4, the inclined beam 5, the reinforced concrete piles 6, and the steel pipe piles 7. The design includes the dimensions, location, reinforcement, and lap joint requirements of each component.

[0034] The second step: Combine the layered and zoned excavation of the soil inside and outside the pit, and cut the slope of the soil at the external corner of the foundation pit so that the subsequent external corner support structure of the foundation pit is inclined inward along the diagonal of the external corner.

[0035] Third step: When constructing the retaining pile 1 at the external corner of the construction pit, simultaneously or within a short time interval before and after, construct the reinforced concrete pile 6 and steel pipe pile 7 at that location. The steel pipe pile 7 is equipped with a grouting pipe. After the steel pipe pile 7 is driven into place, grout is injected into the bottom of the steel pipe pile 7 through the grouting pipe to harden and form a grouting body 8.

[0036] Fourth step: According to the design plan, construct the capping beam 2, connecting beam 3, reinforced concrete slab 4 and inclined beam 5. When binding the internal reinforcement, the reinforcement between the retaining pile 1, capping beam 2, connecting beam 3, reinforced concrete slab 4, inclined beam 5, reinforced concrete pile 6 and steel pipe pile 7 should be effectively connected to each other to ensure the stability of each connection of the support structure.

[0037] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0038] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0039] 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, or they can be used directly or indirectly, without departing from the principles and spirit of the present invention. In other related technical fields, the scope of the present invention is defined by the appended claims and their equivalents, and they are similarly included within the patent protection scope of the present invention.

Claims

1. A foundation pit corner support structure comprising inwardly and outwardly inclined piles, characterized in that, include: The retaining piles have a capping beam cast on top. The capping beam includes a connecting part, two inclined parts, and two horizontal parts. Two connecting beams are connected to the two horizontal parts. Reinforced concrete slabs are connected to the bottom of the two connecting beams. Inclined beams are connected to the two connecting beams. One end of each inclined beam is connected to the connecting part. A reinforced concrete pile is connected to the bottom of the corresponding connecting beam. Two steel pipe piles are connected between the inclined beams. Grouting bodies are connected to the bottom ends of both steel pipe piles.

2. The foundation pit corner support structure including inward and outward inclined piles according to claim 1, characterized in that: The reinforced concrete piles and the two steel pipe piles are all located on the diagonal line outside the pit at the external corner of the foundation pit.

3. The foundation pit corner support structure including inwardly and outwardly inclined piles according to claim 1, characterized in that: The steel pipe pile is equipped with a grouting pipe, and the grouting body is located at the bottom of the grouting pipe.

4. The foundation pit corner support structure including inwardly and outwardly inclined piles according to claim 1, characterized in that: The angle between the reinforced concrete piles and the steel pipe piles and the vertical line is 10-30°.

5. The foundation pit corner support structure including inwardly and outwardly inclined piles according to claim 1, characterized in that: The cap beam, connecting beam, and inclined beam slope diagonally into the pit from the sun's angle, with a slope-to-width ratio between 1:1 and 1:2.

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