Anti-slide pile

Abstract

The application provides an anti-slide pile, which comprises an anti-slide pile body and a retaining plate fixed between two adjacent anti-slide pile bodies; the anti-slide pile body has a cross section in the shape of a H-beam, and comprises a prefabricated soil entering section and a cast-in-place cantilever section, and the cantilever section is integrally cast with the retaining plate; the anti-slide pile body comprises a first wing plate, a second wing plate and a web plate fixed vertically between the first wing plate and the second wing plate, and prestressed steel strands are arranged in the web plate; grouting pipes are arranged in the first wing plate and the second wing plate, the grouting pipes comprise main pipes and a plurality of branch pipe assemblies different in height and connected to the main pipes, and end portions of the branch pipe assemblies extend to the surface of the anti-slide pile body to form a plurality of grouting outlets different in height. The H-beam cross section design is used to save materials, reduce costs, shorten the construction period, reduce the exposure time of the soil body, reduce the risk of slope instability and improve the construction safety.

Description

Technical Field

[0001] This application relates to the field of building engineering technology, and in particular to an anti-slide pile. Background Technology

[0002] In slope stabilization, roadbed retaining, and geological disaster prevention projects, anti-slide piles are widely used as an important support structure to withstand landslide thrust and maintain soil stability. Traditional anti-slide piles are mostly reinforced concrete rectangular section piles cast in place. The construction process typically includes: drilling, reinforcing steel binding, formwork erection, concrete pouring, and curing. Although this construction method has good structural integrity, it suffers from problems such as long construction period, large amount of on-site work, significant susceptibility to weather conditions, and prolonged soil exposure.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of this application is to provide an anti-slide pile that balances structural performance and construction efficiency, so as to solve or alleviate the problems existing in the prior art.

[0005] To achieve the above objectives, this application provides the following technical solution: An anti-slide pile includes an anti-slide pile body and a retaining plate fixed between two adjacent anti-slide pile bodies; the cross-section of the anti-slide pile body is I-shaped, and the anti-slide pile body includes a prefabricated soil insertion section and a cast-in-place cantilever section, wherein the cantilever section and the retaining plate are integrally cast and formed. The anti-slide pile body includes a first wing plate, a second wing plate, and a web plate vertically fixed between the two. Prestressed steel strands are provided in the web plate. Grouting conduits are provided in the first wing plate and the second wing plate. The grouting conduits include a main grouting pipe and several branch pipe assemblies of different heights connected to the main grouting pipe. The ends of the branch pipe assemblies extend to the surface of the anti-slide pile body to form several grout outlets of different heights.

[0006] Furthermore, the first wing is a pressure-bearing wing, and the width of the first wing is 60% to 100% of the width of the second wing.

[0007] Furthermore, the grouting main pipe includes a first main pipe and a second main pipe disposed in the lower part of the second wing plate; the first main pipe is disposed through the first wing plate, or is disposed only in the lower part of the first wing plate.

[0008] Furthermore, the branch pipe assembly includes a main branch pipe and 2 to 10 secondary branch pipes connected to the main branch pipe.

[0009] Furthermore, the diameter of the main grouting pipe is 70-110mm; the diameter of the main branch pipe and the secondary branch pipe of the branch pipe assembly is 40-60mm; the distance between two adjacent main branch pipes is 1-2m, and the distance between the grout outlets on the same surface is 0.5-1m.

[0010] Furthermore, the top of the anti-slide pile's soil-entry section is provided with an extension bar, and the cantilever section is a reinforced concrete structure with a steel reinforcement skeleton, which is welded to the extension bar; the length of the extension bar is 10d to 50d, where d is the diameter of the bar.

[0011] Furthermore, the height of the isosceles trapezoid circumscribed outside the anti-slide pile (i.e., the distance between the opposite sides of the first and second flanges) is 2000–3000 mm; the pile spacing is related to the soil geology and the anti-slide capacity of the anti-slide pile. The worse the soil quality, the smaller the pile spacing; the smaller the bearing capacity of the anti-slide pile, the smaller the pile spacing. Based on construction experience, the pile spacing between two adjacent anti-slide piles is generally 4–8 m, with the specific spacing determined by calculation. For example, if the upper layer of a slope to be reinforced is completely weathered sandstone and the lower layer is shale, with an exposed height of 13 m, then the pile spacing between two I-section anti-slide piles is 5 m, with an 11 m penetration depth (the penetration length of the anti-slide pile is 11 mm), and the precast retaining plate thickness is 40 cm. The prestressed steel strands can be adjusted according to actual needs. For example, there are 4 prestressed steel strands, each with 15 steel strands. Each steel strand has a diameter of 15.2 mm and a stress of 1960 MPa, which can be expressed as 15Φ15.2 (1960).

[0012] Furthermore, the first wing plate and the second wing plate have the same thickness, and the thickness of the first wing plate is less than the thickness of the web plate.

[0013] Furthermore, the upper and lower ends of the prestressed steel strand are respectively anchored at the centerline of the web, and the middle part of the prestressed steel strand is fixed on the side near the first flange.

[0014] Furthermore, the connection between the first wing plate and the web plate, and the connection between the second wing plate and the web plate, are both chamfered.

[0015] The technical solution of this application has the following beneficial effects: The I-shaped cross-section design of this application requires less material than traditional rectangular cross-section concrete anti-slide piles under the same anti-slide capacity requirements, which helps to save materials and reduce costs. Prestressing within the pile enhances its bending and shear resistance, further reducing the amount of steel reinforcement and concrete. Grouting holes within the precast piles allow for on-site grouting reinforcement of the surrounding soil, further improving anti-slide capacity and overall stability. The application's factory-prefabricated underground section and on-site cast-in-place cantilever section shortens the construction period, reduces soil exposure time, lowers the risk of slope instability, and improves construction safety. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Figure 1 This is a schematic diagram of the anti-slide pile according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the anti-slide pile body according to an embodiment of the present utility model.

[0018] Figure 3 This is a side view of the anti-slide pile body according to an embodiment of the present utility model.

[0019] Figure 4 This is a cross-sectional schematic diagram of the soil entry section according to an embodiment of the present utility model.

[0020] Figure 5 This is a schematic diagram of the soil entry section in an embodiment of the present utility model.

[0021] Figure 6 This is a schematic diagram of the grouting head used in the construction of this utility model.

[0022] Explanation of reference numerals in the attached figures: 1. Soil-entry section; 11. Extension steel bar; 101. First wing plate; 102. Second wing plate; 2. Cantilever section; 3. Retaining plate; 4. Prestressed duct; 5. Grout outlet; 51. First main pipe; 52. Main branch pipe; 53. Secondary branch pipe; 54. Second main pipe; 6. Grouting head; 61. Airbag; 10. Ground line on the back soil surface; 20. Ground line on the front soil surface. Detailed Implementation

[0023] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0024] In the following description, the terms "first / second / third" are used merely to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to limit this disclosure.

[0026] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and do not require this application to be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly.

[0027] like Figures 1 to 6 As shown, an anti-slide pile includes an anti-slide pile body and a retaining plate 3 fixed between two adjacent anti-slide pile bodies; the cross-section of the anti-slide pile body is I-shaped, and the anti-slide pile body includes a prefabricated soil-entry section 1 and a cast-in-place cantilever section 2, wherein the cantilever section 2 and the retaining plate 3 are integrally cast and formed. Figure 1 , Figure 2 The ground line 20 on the soil-facing side and the ground line 10 on the soil-reverse side are schematically drawn. The section below the ground line 10 on the soil-reverse side is the soil-entry section 1, and the section above the ground line 10 on the soil-reverse side is the cantilever section 2. The anti-slide pile body includes a first wing plate 101, a second wing plate 102, and a web plate vertically fixed between the two. Prestressed steel strands are provided in the web plate. Grouting conduits are provided in the first wing plate 101 and the second wing plate 102. The grouting conduits include a main grouting pipe and several branch pipe assemblies of different heights connected to the main grouting pipe. The ends of the branch pipe assemblies extend to the surface of the anti-slide pile body to form several grout outlets 5 of different heights.

[0028] Furthermore, such as Figures 1 to 2 As shown, the grouting main pipe includes a first main pipe 51 and a second main pipe 54 disposed in the lower part of the second wing plate 102 (corresponding to the precast soil entry section 1); the first main pipe 51 is disposed through the first wing plate 101, or is disposed only in the lower part of the first wing plate 101 (the first main pipe 51 is not disposed in the cast-in-place cantilever section 2, but is disposed only in the precast soil entry section 1). The grout outlet 5 is disposed on the side of the anti-sliding pile body that contacts the soil, and must be disposed on the soil-facing and soil-repellent surfaces of the first wing plate 101 and the second wing plate 102 of the soil entry section 1, as well as the soil-facing surface of the first wing plate 101 of the cantilever section 2; the grout outlet 5 can also be disposed on the narrow sides of the first wing plate 101 and the second wing plate 102 of the soil entry section 1.

[0029] Furthermore, such as Figures 1 to 2 As shown, the branch pipe assembly includes a main branch pipe 52 and 2 to 10 secondary branch pipes 53 connected to the main branch pipe 52; the diameter of the main grouting pipe is 70 to 110 mm; the diameter of the main branch pipe 52 and the secondary branch pipes 53 of the branch pipe assembly is 40 to 60 mm; the spacing between the main branch pipes 52 (i.e., the spacing between adjacent grout outlets 5) is 1 to 2 m, and the lateral spacing between the grout outlets 5 on the same surface is 0.5 to 1 m. The grouting conduit is made of ordinary steel pipe, plastic pipe, or other conventional pre-embedded pipe materials.

[0030] The width and thickness of the first flange 101, the second flange 102, the web, and the soil penetration section 1 of the anti-slide pile body are determined based on the working conditions (height of the cantilever section 2, soil type) and structural calculations. In one embodiment, such as... Figures 1 to 5 As shown, the first wing plate 101 is a compression wing plate, and the width of the first wing plate 101 is 60% to 100% of the width of the second wing plate 102. The thicknesses of the first wing plate 101 and the second wing plate 102 are equal, and the thickness of the first wing plate 101 is less than the thickness of the web plate, for example, the thickness of the first wing plate 101 is 75% to 80% of the thickness of the web plate. In a specific example, if the upper layer (above the back soil surface line 10) is completely weathered sandstone and the lower layer (below the back soil surface line 10) is shale, and the exposed height of the cantilever section 2 is 13m, then the pile spacing between the two anti-slide piles is 5m, the penetration depth is 11m (the penetration length of the anti-slide pile 1 is 11mm), and the thickness of the cast-in-place retaining plate 3 is 40cm. The prestressing curve can be flexibly arranged according to actual needs, and the prestressing duct 4 is generally a corrugated pipe.

[0031] Furthermore, such as Figure 5 As shown, the top of the anti-slide pile's entry section 1 is equipped with an extension steel bar 11. The cantilever section 2 is a reinforced concrete structure with a steel reinforcement cage, which is welded to the extension steel bar 11. The length of the extension steel bar 11 is 10d to 50d, where d is the diameter of the steel bar. The entry section 1 and cantilever section 2 of the anti-slide pile are made of high-strength concrete of C50 or higher and high-strength steel bars of HRB500. During prefabrication, the entry section 1 of the anti-slide pile is equipped with a lifting hole for convenient on-site lifting. The entry section 1 can also be prefabricated in sections according to the lifting capacity, and then connected on-site using wet joints.

[0032] Furthermore, the height of the isosceles trapezoid circumscribed outside the anti-slide pile body (i.e., the distance between the opposite sides of the first wing plate 101 and the second wing plate 102) is 2000–3000 mm; the pile spacing is related to the soil geology and the anti-slide capacity of the anti-slide pile. The worse the soil quality, the smaller the pile spacing; the lower the bearing capacity of the anti-slide pile, the smaller the pile spacing. Based on construction experience, the pile spacing between two adjacent anti-slide pile bodies is generally 4–8 m, and the specific spacing is determined by calculation. The prestressed steel strands can be adjusted according to actual needs. For example, if the upper layer of a slope to be reinforced is completely weathered sandstone and the lower layer is shale, with an exposed height of 13m, then the pile spacing between the two anti-slide piles is 5m, the pile depth is 11m (the length of the soil penetration section 1 is 11mm), and the thickness of the retaining plate 3 is 40cm; a total of 4 prestressed steel strands are set, each bundle has 15 steel strands, each steel strand has a diameter of 15.2mm, and the stress of the steel strand is 1960MPa (which can be expressed as 15Φ15.2 (1960)).

[0033] Furthermore, such as Figures 2 to 3 As shown, the upper and lower ends of the prestressed steel strand are respectively anchored at the centerline of the web, and the middle part of the prestressed steel strand is fixed on one side (compression side) near the first flange 101.

[0034] Furthermore, such as Figures 1 to 5 As shown, the connection between the first wing plate 101 and the web plate, and the connection between the second wing plate 102 and the web plate are both chamfered.

[0035] The construction method of this application is as follows: When prefabricating the soil-insertion section 1, first cut the required whole length of steel strand and corrugated pipe (including cantilever section 2) as prestressed duct 4. Thread the steel strand into the corrugated pipe in advance, and pre-embed the prestressing (including steel strand, corrugated pipe, and anchoring end) corresponding to soil-insertion section 1 within soil-insertion section 1. The remaining steel strand and corrugated pipe (corresponding to cantilever section 2) are left outside the prefabricated soil-insertion section 1 and can be coiled up and hung at the end of soil-insertion section 1.

[0036] The construction of the anti-slide pile insertion section 1 was carried out on site; then, the prefabricated insertion section 1 was transported to the site, installed into the hole, and the surrounding soil was backfilled and compacted in layers until the original ground level was reached. On-site construction included the installation of the reinforcing steel cage for cantilever section 2 and retaining plate 3, as well as formwork, in preparation for pouring. During the construction of the reinforcing steel cage, the corrugated pipes and steel strands coiled at the ends were straightened and installed into their designated positions within cantilever section 2. After the concrete for cantilever section 2 was poured, the soil around the pile was reinforced through grouting pipes. Finally, single-end tensioning was performed at the top of cantilever section 2, followed by grouting of the pipes, completing the entire prestressed steel strand construction. This process ensures that the steel strands within the entire anti-slide pile are continuous and form a unified structure, enabling the application of prestress to the entire anti-slide pile.

[0037] The grouting conduit can be similar to a steel strand, with its full length pre-fabricated in the entry section 1 and then coiled up. Alternatively, the grouting conduit can be pre-embedded in the entry section 1, with an interface pre-installed at the top of the entry section 1, allowing for on-site extension of the upper half during construction. A further simplification is possible, where the grouting conduit is only installed in the entry section 1, and not in the cantilever section 2.

[0038] When injecting grout into the grouting conduit, a special grouting head 6 is used, the structure of which is as follows: Figure 6 As shown, an air bladder 61 is fixed to the outer periphery of the grouting head 6. The air bladder 61 is connected to an air tube, which allows for controlled inflation and deflation of the air bladder 61. During grouting, the air bladder 61 is inflated so that it adheres tightly to the inner wall of the grouting conduit. When the grouting head 6 is moved upward, the air bladder 61 is deflated. During grouting, the grouting head 6 is inserted into the grouting conduit using a retractable grouting method: first, the grouting head 6 is inserted along the main grouting pipe to the top of the lowest branch pipe assembly, and air is inflated into the air bladder 61 so that it adheres tightly to the inner wall of the main grouting pipe. Grouting begins. Before the grout initially sets, the grouting head 6 is moved upward to the position of the corresponding upper grout outlet 5 before grouting. This allows the grout from the upper and lower parts to combine. This cycle is repeated to complete the entire grouting process. The thickness of the overburden layer above the uppermost grout outlet 5 should be greater than 2m.

[0039] If anti-slide piles are fabricated on-site, wooden formwork is typically used, requiring the installation and removal of formwork for each pile. This involves a significant amount of formwork work, is labor-intensive, and slows down construction. Factory prefabrication, on the other hand, allows for the customization of a small number of steel molds for batch production, resulting in faster speed and easier quality control. Furthermore, compared to on-site formwork within the hole, using prefabricated entry sections (section 1) requires smaller hole dimensions, reducing excavation time and improving construction efficiency. Additionally, for the same anti-slide capability, I-section anti-slide piles have a smaller cross-sectional area than conventional rectangular concrete anti-slide piles, saving on concrete and steel materials (reinforcing bars, prestressed steel strands) and reducing costs.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An anti-slide pile, characterized in that: It includes anti-slide pile bodies and retaining plates (3) fixed between two adjacent anti-slide pile bodies; the cross-section of the anti-slide pile body is I-shaped, and the anti-slide pile body includes a prefabricated soil-entry section (1) and a cast-in-place cantilever section (2), and the cantilever section (2) and the retaining plate (3) are integrally cast and formed. The anti-slide pile body includes a first wing plate (101), a second wing plate (102), and a web plate vertically fixed between the two. Prestressed steel strands are provided in the web plate. Grouting conduits are provided in the first wing plate (101) and the second wing plate (102). The grouting conduits include a main grouting pipe and several branch pipe assemblies of different heights connected to the main pipe. The ends of the branch pipe assemblies extend to the surface of the anti-slide pile body to form several grout outlets (5) of different heights.

2. The anti-slide pile according to claim 1, characterized in that: The first wing plate (101) is a pressure-bearing wing plate, and the width of the first wing plate (101) is 60% to 100% of the width of the second wing plate (102).

3. The anti-slide pile according to claim 1, characterized in that: The grouting main pipe includes a first main pipe (51) and a second main pipe (54) disposed in the lower part of the second wing plate (102); the first main pipe (51) is disposed through the first wing plate (101), or is disposed only in the lower part of the first wing plate (101).

4. The anti-slide pile according to claim 3, characterized in that: The branch assembly includes a main branch (52) and 2 to 10 secondary branch (53) connected to the main branch (52).

5. The anti-slide pile according to claim 4, characterized in that: The diameter of the main grouting pipe is 70-110mm; the diameter of the main branch pipe (52) and secondary branch pipe (53) of the branch pipe assembly is 40-60mm; the distance between two adjacent main branch pipes (52) is 1-2m, and the distance between the grout outlets (5) on the same surface is 0.5-1m.

6. The anti-slide pile according to claim 1, characterized in that: The top of the anti-slide pile entry section (1) is provided with an extension steel bar (11), and the cantilever section (2) is a reinforced concrete structure with a steel bar skeleton, which is welded to the extension steel bar (11).

7. The anti-slide pile according to claim 1, characterized in that: The height of the circumscribed trapezoid of the cross-section of the anti-slide pile is 2000-3000 mm; the distance between two adjacent anti-slide piles is 4-8 m.

8. The anti-slide pile according to claim 1, characterized in that: The first wing plate (101) and the second wing plate (102) have the same thickness, and the thickness of the first wing plate (101) is less than the thickness of the web plate.

9. The anti-slide pile according to claim 1, characterized in that: The upper and lower ends of the prestressed steel strand are respectively anchored at the centerline of the web, and the middle part of the prestressed steel strand is fixed on the side near the first wing plate (101).

10. The anti-slide pile according to claim 1, characterized in that: The connection between the first wing plate (101) and the web plate, and the connection between the second wing plate (102) and the web plate are both chamfered.

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