Slope protection pile foundation pit supporting structure

Abstract

The utility model provides a slope protection pile foundation pit supporting structure which comprises a first step supporting structure and a second step supporting structure, the slope protection piles are arranged on deep foundation pit slope protection piles, the gradient of an upper slope of a deep foundation pit is 1: 4, and double rows of supporting piles are arranged at the deep foundation pit and are arranged in a step shape. The first step supporting structure is connected with the upper portion of the deep foundation pit through a second top beam, the bottom of the second top beam is connected with a supporting pile, and the supporting pile is connected with the second step supporting structure through a slope bottom ground beam, a row pile connecting beam and the first top beam in sequence. Concrete waist beams, anchor cables and drainage holes are arranged on the side surfaces of the support piles in the first step support structure and the second step support structure; a hanging net is arranged on the surface, connected with the supporting piles, from the top beam of the first step supporting structure to the slope bottom ground beam, a hanging net is arranged on the surface, connected with the supporting piles, from the first top beam of the second step supporting structure to the foundation pit base, and concrete is sprayed to the hanging nets. The slope protection pile foundation pit supporting structure is high in erosion resistance, and the gradient and displacement of a foundation pit can be effectively controlled.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of building engineering, especially relates to a slope protection pile foundation pit support structure. BACKGROUND

[0002] The slope protection pile foundation pit support is a commonly used deep foundation pit support method, and is suitable for engineering with complex geological conditions, high underground water level and large foundation pit depth. The slope protection pile foundation pit support forms a solid support structure by arranging slope protection piles around the foundation pit, and effectively prevents the sliding and collapse of the foundation pit slope.

[0003] At present, the surrounding environment of the deep foundation pit is complex, and is easily eroded by rivers, and the soil and water loss greatly affects the stability of the foundation pit. The anti-erosion ability of the ordinary support structure is weak, and the stability of the foundation pit is seriously affected. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the utility model aims at providing a slope protection pile foundation pit support structure to solve the problem that the surrounding environment of the deep foundation pit is complex, and is easily eroded by rivers, and the soil and water loss greatly affects the stability of the foundation pit. The anti-erosion ability of the ordinary support structure is weak, and the stability of the foundation pit is seriously affected.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The utility model provides a slope protection pile foundation pit support structure, is located in deep foundation pit slope protection pile and the upper slope of deep foundation pit is 1:4, is provided with double row support pile in deep foundation pit and is arranged in ladder shape, includes, first ladder support structure and second ladder support structure, first ladder support structure is connected with the upper part of deep foundation pit through second corona roof beam, the bottom of second corona roof beam is connected with support pile, and support pile is connected with second ladder support structure through slope bottom ground beam, row pile connecting beam and first corona roof beam in sequence, the side surface of support pile in first ladder support structure and second ladder support structure is equipped with a plurality of concrete waist beams, anchor cable connected with concrete waist beam and a plurality of drainage holes, the surface where first ladder support structure corona roof beam and slope bottom ground beam are connected with support pile is provided with hanging net, the surface where second ladder support structure first corona roof beam and foundation pit base are connected with support pile is provided with hanging net, and the hanging net sprays concrete.

[0007] Further, the layer thickness of the concrete sprayed on the hanging net in the first ladder support structure is 200mm, and the hanging net is double-layer reinforced mesh; the layer thickness of the concrete sprayed on the hanging net in the second first ladder support structure is 100mm, and the strength of the sprayed concrete is C20; the reinforced mesh used for the hanging net is φ8, and the interval is 200mm*200mm.

[0008] Further, the horizontal distance between the anchor cable centers is 2000mm, the anchor cable aperture is 150mm, the anchor cable inclination is set to 20°, and the anchor cable 4 bundles are composed of 15.2mm diameter steel strands.

[0009] Further, the anchor cable is fixed with the concrete waist beam through the anchor and the steel backing plate.

[0010] Further, the drain hole is inclined downward and arranged on the upper and lower sides of the concrete waist beam.

[0011] Further, the concrete waist beams are evenly arranged on the side surface of the support pile and the contact surface of the two is roughened, the concrete waist beam is connected with the support pile through a plurality of first connecting steel bars, a plurality of waist beam steel bars are arranged in the concrete waist beam, and the inclination of the first connecting steel bar is set to 10-25°.

[0012] Further, a drainage ditch is arranged at the foundation pit base.

[0013] Further, a safety guardrail, a water intercepting ditch and a low retaining wall are sequentially arranged on the right side of the upper second crown beam of the deep foundation pit.

[0014] Compared with the prior art, the slope protection pile foundation pit supporting structure has the following advantages:

[0015] The slope protection pile foundation pit supporting structure adopts a supporting mode of double-row piles cooperating with anchor cables, wherein the double-row piles can provide additional lateral pressure resistance, and cooperating with anchor rods can enhance the erosion resistance of the supporting structure, adapt to complex and changeable geological conditions, and reduce the influence of water and soil loss on the stability of the foundation pit. The supporting scheme of the double-row piles and the anchor rods can effectively control the slope and displacement of the foundation pit, especially in the case that the slope is limited, by adjusting the depth and spacing of the piles, the stability and deformation of the foundation pit can be better controlled. The low retaining wall can prevent the roadbed slope or the base from sliding and ensure the stability of the roadbed. The roughening treatment of the contact surface of the support pile and the waist beam increases the bonding force between the two, and ensures the stability and integrity of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings constituting a part of the present application serve to provide a further understanding of the present application, and the schematic embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application.

[0017] In the drawings:

[0018] Fig. 1 The overall structure schematic view of the slope protection pile foundation pit supporting structure according to the embodiment of the present application is shown in the figure.

[0019] Fig. 2 The concrete waist beam and anchor cable connection schematic view of the slope protection pile foundation pit supporting structure according to the embodiment of the present application is shown in the figure.

[0020] Fig. 3 The utility model discloses a concrete waist beam and support pile connection schematic view of slope pile foundation pit supporting structure.

[0021] Mark explanation:

[0022] 1, drain hole;2, first crown beam;3, drainage ditch;4, row pile link beam;5, side slope bottom ground beam;6, concrete waist beam;7, net;8, second crown beam;9, safety guardrail;10, water interception ditch;11, low retaining wall;12, support pile;13, anchor cable;14, first connecting steel;601, waist beam steel. Specific implementation

[0023] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0024] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the drawing shown, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the utility model, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through the intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0026] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] Reference Figs. 1-3As shown, the embodiment provides a slope protection pile foundation pit support structure, which is arranged in a deep foundation pit slope protection pile and the upper slope of the deep foundation pit has a slope of 1:4, double-row support piles are arranged at the deep foundation pit and are arranged in a stepped manner, and the slope protection pile foundation pit support structure comprises a first stepped support structure and a second stepped support structure. The first stepped support structure is connected to the upper part of the deep foundation pit through a second crown beam 8, the bottom of the second crown beam 8 is connected to a support pile 12, the support pile 12 is sequentially connected to the second stepped support structure through a slope bottom ground beam 5, a row pile connecting beam 4, a first crown beam 2, and a second crown beam 2. The side surface of the support pile 12 in the first stepped support structure and the second stepped support structure is provided with a plurality of concrete waist beams 6, anchor cables 13 connected to the concrete waist beams 6, and a plurality of drainage holes 1. The surface where the first crown beam of the first stepped support structure is connected to the support pile 12 at the slope bottom ground beam 5 is provided with a hanging net 7, the surface where the first crown beam 2 of the second stepped support structure is connected to the support pile 12 at the foundation pit base is provided with a hanging net 7, and the hanging net 7 is sprayed with concrete.

[0028] Specifically, in the embodiment, the thickness of the concrete layer sprayed on the hanging net 7 in the first stepped support structure is 200 mm, and the hanging net 7 is a double-layer steel mesh; the thickness of the concrete layer sprayed on the hanging net 7 in the second first stepped support structure is 100 mm, and the sprayed concrete has a strength of C20; the hanging net 7 adopts a steel mesh with a diameter of φ8 and a spacing of 200 mm x 200 mm.

[0029] Specifically, in the embodiment, the horizontal distance between the centers of the anchor cables is 2000 mm, the anchor cable aperture is 150 mm, the inclination angle of the anchor cable 13 is 20°, and the anchor cable 13 is composed of 4 bundles of 15.2 mm diameter steel strands.

[0030] Specifically, in the embodiment, the anchor cable 13 is fixed with the concrete waist beam 6 through an anchor 16 and a steel backing plate 15.

[0031] Specifically, in the embodiment, the drainage hole 1 is arranged on the upper and lower sides of the concrete waist beam 6 and is arranged in a downward inclined manner.

[0032] Specifically, in the embodiment, the concrete waist beam 6 is uniformly arranged on the side surface of the support pile 12 and the contact surfaces of the two are roughened, the concrete waist beam 6 is connected to the support pile 12 through a plurality of first connecting steel bars 14, a plurality of waist beam steel bars 601 are arranged in the concrete waist beam 6, and the inclination angle of the first connecting steel bar 14 is 10-25°.

[0033] Specifically, in the embodiment, a drainage ditch 3 is arranged at the foundation pit base.

[0034] Specifically, in the embodiment, a safety guardrail 9, a water interception ditch 10, and a low retaining wall 11 are sequentially arranged on the right side of the second crown beam 8 of the upper part of the deep foundation pit.

[0035] In the embodiment, the crown beam elevation is 59 m, the slope bottom elevation is 47.0-50.5 m, the foundation pit bottom elevation is 40 m, the first crown beam and the second crown beam are both C30 crown beams, the support pile is a rotary drilling pile D1200@2000, the horizontal distance between the anchor cable centers (i.e. the horizontal distance of the two rows of support piles) is 2000mm, the anchor cable aperture is 150mm, the inclination of the anchor cable 13 is 20°, the anchor cable 13 is composed of 4 bundles of 15.2mm diameter steel strands. The total length of the anchor cable of the first stepped support structure is 30000mm, the free section length of the anchor cable is 10000mm, and the anchoring section length is 20000mm. The total length of the anchor cable of the second stepped support structure is 29000mm, the free section length of the anchor cable is 10000mm, and the anchoring section length of the anchor cable is 19000mm.

[0036] The slope protection pile foundation pit support structure adopts a support mode of double-row piles combined with anchor cables, wherein the double-row piles can provide additional lateral pressure resistance, and in combination with anchor rods, the erosion resistance of the support structure can be enhanced, complex and variable geological conditions can be adapted, and the influence of water and soil loss on the stability of the foundation pit can be reduced. The support scheme of double-row piles combined with anchor rods can effectively control the slope and displacement of the foundation pit, especially in the case of limited slope, by adjusting the depth and spacing of the piles, the stability and deformation of the foundation pit can be better controlled. The low retaining wall can prevent the roadbed slope or base from sliding and ensure the stability of the roadbed. The roughening treatment of the contact surface between the support pile and the waist beam increases the bonding force therebetween and ensures the stability and integrity of the structure.

[0037] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A revetment pile foundation pit support structure characterized by, It is arranged in the deep foundation pit slope protection pile and the upper part of the deep foundation pit slope is 1:4, the double-row support pile is arranged at the deep foundation pit and is arranged in a stepped manner, comprising a first stepped support structure and a second stepped support structure; the first stepped support structure is connected with the upper part of the deep foundation pit through a second corbel beam (8), the bottom of the second corbel beam (8) is connected with a support pile (12), the support pile (12) is connected with the second stepped support structure in sequence through a slope bottom ground beam (5), a row pile connecting beam (4), a first corbel beam (2); the side surface of the support pile (12) in the first stepped support structure and the second stepped support structure is provided with a plurality of concrete waist beams (6), anchor cables (13) connected with the concrete waist beams (6), and a plurality of drainage holes (1); the second corbel beam (8) of the first stepped support structure is provided with a hanging net (7) at the surface connected with the support pile (12) at the slope bottom ground beam (5), the first corbel beam (2) of the second stepped support structure is provided with a hanging net (7) at the surface connected with the support pile (12) at the foundation pit base, and the hanging net (7) is sprayed with concrete.

2. The revetment pile foundation pit support structure according to claim 1, characterized by, The concrete layer sprayed on the hanging net (7) in the first stepped support structure is 200mm thick, and the hanging net (7) is a double-layer reinforced net; the concrete layer sprayed on the hanging net (7) in the second first stepped support structure is 100mm thick, and the sprayed concrete has a strength of C20; the hanging net (7) adopts a φ8 reinforced net with a spacing of 200mm×200mm.

3. The revetment pile foundation pit support structure according to claim 1, characterized by, The horizontal distance between the centers of the anchor cables is 2000mm, the anchor cable aperture is 150mm, the inclination angle of the anchor cable (13) is 20°, and the anchor cable (13) is composed of four bundles of 15.2mm diameter steel strands.

4. The revetment pile foundation pit support structure according to claim 1, characterized by, The anchor cable (13) is fixed with the concrete waist beam (6) through an anchorage device (16) and a steel backing plate (15).

5. The revetment pile foundation pit support structure according to claim 1, characterized by, The drainage hole (1) is arranged on the upper and lower sides of the concrete waist beam (6) and is arranged in a downward inclined manner.

6. The revetment pile foundation pit support structure according to claim 1, characterized by, The concrete waist beam (6) is uniformly arranged on the side surface of the support pile (12) and the contact surfaces thereof are roughened, the concrete waist beam (6) and the support pile (12) are connected through a plurality of first connecting steels (14), a plurality of waist beam steels (601) are arranged in the concrete waist beam (6), and the inclination angle of the first connecting steel (14) is 10-25°.

7. The revetment pile foundation pit support structure according to claim 1, characterized by, A drainage ditch (3) is arranged at the foundation pit base.

8. The revetment pile foundation pit support structure according to claim 1, characterized by, A safety guardrail (9), a water interception ditch (10) and a low retaining wall (11) are sequentially arranged on the right side of the upper part of the deep foundation pit second corbel beam (8).

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