Deep and large foundation pit composite supporting structure close to busy expressway

Abstract

The utility model discloses a deep and large foundation pit composite supporting structure close to a busy expressway. The deep and large foundation pit composite supporting structure comprises secant piles, a plurality of steel pipe piles, a waist beam and supporting columns. The secant piles and the steel pipe piles are arranged in the foundation pit, the secant piles and the steel pipe piles are connected to form a protective wall, the secant piles are arranged on the side, facing the expressway, of the foundation pit, and the secant piles are connected with the adjacent steel pipe piles through connecting assemblies. The waist beam is arranged along the inner wall of the protective wall and supported by the supporting columns. According to the deep and large foundation pit composite supporting structure close to the busy expressway, two types of piles are mixed, the secant piles are arranged on the side, close to the busy expressway, of the foundation pit for local reinforcement, and the steel pipe piles and the secant piles are arranged to form a parapet wall; the secant piles are high in compressive strength and good in force bearing performance, the steel pipe piles are better in economical efficiency, supporting of a deep and large foundation pit close to a busy expressway can be guaranteed by mixing the two types of piles, and the engineering cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of deep foundation pit support, in particular to a deep and large foundation pit composite support structure adjacent to a busy highway. Background Art

[0002] In construction, support structures are needed to protect foundation pits to ensure construction safety. The existing support structures for deep and large foundation pits near busy highways are mostly single pile support structures. Since the stress on deep and large foundation pits near busy highways is large and unstable, the single pile support structure needs to use piles with high compressive strength and good bearing performance. The use of piles with high compressive strength and good bearing performance will increase the cost of the project. Therefore, it is necessary to design a support structure for deep and large foundation pits near busy highways to reduce the cost of the project while ensuring the overall stability of the foundation pit. Utility Model Content

[0003] The utility model provides a composite supporting structure for a deep and large foundation pit adjacent to a busy highway, so as to meet the comprehensive demand of the supporting structure for a deep and large foundation pit adjacent to a busy highway for ensuring the overall stability of the foundation pit and reducing the cost of the project.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] A composite support structure for a deep and large foundation pit adjacent to a busy highway comprises: interlocking piles, a plurality of steel pipe piles, a waist beam and support columns; the interlocking piles and the plurality of steel pipe piles are arranged in the foundation pit, the interlocking piles and the plurality of steel pipe piles are connected to form a retaining wall, the side of the foundation pit facing the highway is all interlocking piles, the interlocking piles are connected to adjacent steel pipe piles via a connecting assembly; the waist beam is arranged along the inner wall of the retaining wall, and the support columns support the waist beam.

[0006] Furthermore, the bite piles include a plurality of meat piles and a plurality of plain piles, the plurality of meat piles and the plurality of plain piles are alternately arranged, and the meat piles and the plain piles are partially embedded in a circle; both ends of the bite piles are arranged as meat piles.

[0007] Furthermore, the pile includes a steel cage, and the upper steel bars of the steel cage are denser than the lower steel bars.

[0008] Furthermore, the concrete poured in the lower part of the steel cage is stronger than the concrete poured in the upper part.

[0009] Furthermore, the interlocking pile includes a steel cage, and the connecting assembly includes a plurality of connecting hooks, one end of which is fixed on the pipe wall of the steel pipe pile adjacent to the interlocking pile, and the other end hooks the steel bars of the steel cage, and the plurality of connecting hooks are arranged at intervals along the axial direction of the steel pipe pile.

[0010] Furthermore, a plurality of anti-slip teeth are fixedly provided on the contact surface between the connecting hook and the steel cage steel bar.

[0011] Furthermore, a plurality of anti-slip teeth are arranged at intervals along the circumferential direction of the steel bars of the steel cage.

[0012] Furthermore, the steel pipe pile is provided with connecting hook holes corresponding to the number of the connecting hooks, and the ends of the connecting hooks are inserted into the connecting hook holes and then welded and fixed to the steel pipe pile.

[0013] Furthermore, one end of the support column facing the steel pipe pile is connected to the waist beam through a compression platform.

[0014] Furthermore, the waist beam may be detachably connected with an oblique support.

[0015] Beneficial effects:

[0016] The present application discloses a composite support structure for a deep and large foundation pit adjacent to a busy highway, which adopts a mixture of two types of piles. Local reinforcement is performed by setting interlocking piles on the side of the foundation pit adjacent to the busy highway, and a retaining wall is formed by setting steel pipe piles and interlocking piles. The interlocking piles have high compressive strength and good bearing performance, while the steel pipe piles are more economical. The mixture of the two types of piles can not only ensure the support of the deep and large foundation pit adjacent to the busy highway, but also reduce the cost of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a top view of a composite support structure for a deep and large foundation pit near a busy highway disclosed by the utility model;

[0019] Figure 2 It is a side view of a composite support structure for a deep and large foundation pit near a busy highway disclosed by the utility model;

[0020] Figure 3 It is a schematic diagram of a composite support structure of a deep and large foundation pit near a busy highway disclosed by the utility model, in which the meat piles are connected to the steel pipe piles through a connecting assembly;

[0021] Figure 4 Schematic diagram of the steel plates used to process the steel pipe piles adjacent to the meat piles.

[0022] 1. Occlusal pile; 11. Meat pile; 12. Plain pile; 2. Steel pipe pile; 3. Waist beam; 4. Support column; 51. Connecting hook; 52. Anti-slip teeth; 53. Connecting hook hole; 6. Pressure-resistant platform; 7. Oblique support. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] A composite support structure for a deep foundation pit near a busy highway, combined with Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, it includes: interlocking piles 1, multiple steel pipe piles 2, waist beams 3 and support columns 4; the interlocking piles 1 and multiple steel pipe piles 2 are arranged in the foundation pit, and the interlocking piles 1 and multiple steel pipe piles 2 are connected to form a retaining wall. The side of the foundation pit facing the highway is all interlocking piles 1, and the interlocking piles 1 are connected to the adjacent steel pipe piles 2 through a connecting assembly; the waist beams 3 are arranged along the inner wall of the retaining wall, and the support columns 4 support the waist beams 3. The composite support structure adopts a mixture of two pile types, interlocking piles 1 and steel pipe piles 2. The interlocking piles 1 have high compressive strength and good bearing performance, but the cost is high; the steel pipe piles 2 have relatively weak compressive strength and relatively poor bearing performance, but good economy. The composite support structure is locally strengthened by setting interlocking piles 1 on the side of the foundation pit close to the busy highway to prevent the foundation pit from being locally unstable due to the influence of the highway. Steel pipe piles 2 are set at a location of the foundation pit far away from the highway, and the steel pipe piles 2 can meet the protection of the location of the foundation pit far away from the highway. Therefore, the composite support structure formed by the interlocking piles 1 and the steel pipe piles 2 can not only ensure the support of the deep and large foundation pit near the busy highway, but also reduce the cost of the project.

[0025] Due to the different compressive strength and bearing capacity of the two pile types, the deformation of the bite pile 1 and the steel pipe pile 2 is inconsistent. In the vicinity of busy highways, the connection between the bite pile 1 and the steel pipe pile 2 may be broken due to excessive stress. The connection assembly of the composite support structure can improve the strength of the connection between the bite pile 1 and the steel pipe pile 2 and prevent the structure of the connection between the bite pile 1 and the steel pipe pile 2 from becoming unstable.

[0026] Preferably, the bite pile 1 includes a plurality of meat piles 11 and a plurality of plain piles 12, and the plurality of meat piles 11 and the plurality of plain piles 12 are alternately arranged, and the meat piles 11 and the plain piles 12 are partially embedded in a circle to form the bite pile 1; both ends of the bite pile 1 are set as meat piles 11, and the meat piles 11 have high pile body rigidity and strong deformation resistance, and can strengthen the side of the foundation pit close to the busy highway.

[0027] Preferably, the pile 11 includes a steel cage, and the upper steel bars of the steel cage are denser than the lower steel bars. The cars running fast on the highway will cause unstable instantaneous stress. Since the upper part of the steel cage is closer to the road surface of the highway, the upper part of the steel cage is more affected by the stress than the lower part of the steel cage. The upper part of the steel cage is wound with denser steel bars to ensure the stability of the upper part of the steel cage, and the lower part of the steel cage is wound with relatively sparse steel bars to reduce the cost of the project.

[0028] Preferably, according to the different stresses on the lower and upper parts of the steel cage, the concrete poured in the lower part of the steel cage has a higher strength than the concrete poured in the upper part, and after filling, it is compacted and compacted to obtain the pile 11. The obtained pile 11 has a large deadweight and is integrated, and the pile 11 has enhanced compression resistance and stability, and can remain stable when approaching a busy highway without deformation or instability.

[0029] Specifically, the steel cage is filled with crushed stones to improve the compressive strength of the pile 11.

[0030] Preferably, the connection assembly includes a plurality of connection hooks 51, one end of which is fixed on the wall of the steel pipe pile 2 adjacent to the occlusal pile 1, and the other end is hooked on the steel bars of the steel cage, and the plurality of connection hooks 51 are arranged at intervals along the axial direction of the steel pipe pile 2. The connection hook 51 is connected to the steel cage as a whole, and the connection hook 51 has a high tensile strength to prevent the structure of the connection between the occlusal pile 1 and the steel pipe pile 2 from becoming unstable.

[0031] Preferably, a plurality of anti-skid teeth 52 are fixed on the contact surface between the connecting hook 51 and the steel cage steel bar. The anti-skid teeth 52 can increase the friction force after contacting the steel cage steel bar, making the connection between the two more stable.

[0032] Preferably, a plurality of anti-skid teeth 52 are arranged at intervals along the circumferential direction of the steel cage steel bars, so as to increase the contact area between the anti-skid teeth 52 and the steel cage steel bars, thereby making the connection between the connecting hook 51 and the steel cage steel bars more stable.

[0033] Specifically, the anti-slip teeth 52 and the connecting hook 51 are integrally formed, and the encirclement angle of the plurality of anti-slip teeth 52 to the steel cage steel bars is greater than 180°, so that the connecting hook 51 is not easy to be unhooked.

[0034] Preferably, the steel pipe pile 2 is provided with connecting hook holes 53 corresponding to the number of the connecting hooks 51, and the ends of the connecting hooks 51 are inserted into the connecting hook holes 53 and then welded to the steel pipe pile 2. After the connecting hooks 51 are inserted into the connecting hook holes 53, the welding stability is better, and the tensile strength of the welding part of the connecting hooks 51 is higher, which can prevent the structural instability of the connection between the bite pile 1 and the steel pipe pile 2.

[0035] Specifically, a connecting hook hole 53 is drilled in the steel plate, and the connecting hook 51 is inserted into the connecting hook hole 53 and fixed by welding. After welding, the connecting hook 51 is processed by a machine to become a cylindrical shape and then filled with soil.

[0036] Specifically, adjacent steel pipe piles 2 are welded to each other so that the plurality of steel pipe piles 2 are connected as a whole, thereby improving the supporting effect of the steel pipe piles 2 .

[0037] Preferably, the end of the support column 4 facing the steel pipe pile 2 is connected to the waist beam 3 through a pressure-resistant platform 6, and the pressure-resistant platform 6 is detachably connected to the waist beam 3 by bolts. The bearing capacity of the bite pile 1 and the steel pipe pile 2 is different. Adding the pressure-resistant platform 6 reduces the pressure of the support column 4 on the steel pipe pile 2 to improve safety.

[0038] Preferably, the waist beam 3 is further detachably connected with an oblique support 7 , which is fixed to the waist beam 3 by bolts to support the waist beam 3 .

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A composite support structure for a deep foundation pit near a busy highway, characterized in that: include: An interlocking pile (1), a plurality of steel pipe piles (2), a waist beam (3) and a support column (4); the interlocking pile (1) and the plurality of steel pipe piles (2) are arranged in the foundation pit, the interlocking pile (1) and the plurality of steel pipe piles (2) are connected to form a retaining wall, the interlocking piles (1) are arranged on one side of the foundation pit facing the highway, and the interlocking piles (1) are connected to adjacent steel pipe piles (2) via a connecting assembly; the waist beam (3) is arranged along the inner wall of the retaining wall, and the support column (4) supports the waist beam (3).

2. A composite support structure for a deep and large foundation pit near a busy highway according to claim 1, characterized in that: The bite pile (1) comprises a plurality of meat piles (11) and a plurality of plain piles (12), wherein the plurality of meat piles (11) and the plurality of plain piles (12) are arranged alternately, and the meat piles (11) and the plain piles (12) are partially circumferentially embedded in each other; both ends of the bite pile (1) are arranged as the meat piles (11).

3. The composite support structure for a deep and large foundation pit near a busy highway according to claim 2 is characterized in that: The pile (11) comprises a steel cage, wherein the upper steel bars of the steel cage are denser than the lower steel bars.

4. The composite support structure for a deep and large foundation pit near a busy highway according to claim 3 is characterized in that: The concrete poured at the lower part of the steel cage has higher strength than the concrete poured at the upper part.

5. The composite support structure for a deep and large foundation pit near a busy highway according to claim 1 is characterized in that: The snap pile (1) comprises a steel cage, and the connection assembly comprises a plurality of connection hooks (51), one end of the connection hook (51) is fixed on the pipe wall of the steel pipe pile (2) adjacent to the snap pile (1), and the other end hooks the steel bars of the steel cage, and the plurality of connection hooks (51) are arranged at intervals along the axial direction of the steel pipe pile (2).

6. A composite support structure for a deep and large foundation pit near a busy highway according to claim 5, characterized in that: A plurality of anti-slip teeth (52) are fixedly provided on the contact surface between the connecting hook (51) and the steel cage steel bar.

7. A composite support structure for a deep and large foundation pit near a busy highway according to claim 6, characterized in that: The plurality of anti-slip teeth (52) are arranged at intervals along the circumferential direction of the steel bars of the steel cage.

8. The composite support structure for a deep and large foundation pit near a busy highway according to claim 5, characterized in that: The steel pipe pile (2) is provided with connection hook holes (53) corresponding in number to the connection hooks (51), and the ends of the connection hooks (51) are inserted into the connection hook holes (53) and then welded to the steel pipe pile (2).

9. The composite support structure for a deep and large foundation pit near a busy highway according to claim 1, characterized in that: The support column (4) is connected to the waist beam (3) through a pressure-resistant platform (6) at one end facing the steel pipe pile (2).

10. The composite support structure for a deep and large foundation pit near a busy highway according to claim 1, characterized in that: The waist beam (3) is also detachably connected with an oblique support (7).

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