A pc method pile support structure for impervious ground

Abstract

The utility model discloses a PC method pile supporting structure for impermeable stratum belongs to foundation pit supporting technical field, and the supporting structure is formed by the alternate arrangement of steel pipe pile and larsen steel sheet pile, and the flange of steel sheet pile is directly and closely combined with the outer wall of steel pipe pile, and the continuous retaining wall body is formed by the lateral extrusion effect of soil body. The application cancels the lock connection, significantly simplifies the construction process, avoids the difficulty of lock occlusion and unlocking, improves the piling efficiency and the perpendicularity of pile body, simultaneously reduces the component loss, makes the recycling of most components, and is especially suitable for the foundation pit supporting engineering without groundwater control, and has the remarkable economic and environmental protection benefits.

Description

Technical Field

[0001] This utility model relates to the technical field of foundation pit support, and in particular to a PC pile support structure for impermeable strata. Background Technology

[0002] PC (Precast Concrete) piles are a composite support system combining steel pipe piles and Larssen sheet piles. They form a continuous retaining wall with both high rigidity and water-stopping capabilities by welding special interlocking joints onto the steel pipe piles and interlocking them with the Larssen sheet piles. This structure is widely used in soft soil areas requiring both soil retention and water stopping.

[0003] However, when excavating foundation pits in impermeable strata, the primary function of the support structure is soil retention rather than water stoppage. In this case, the interlocking structure of traditional precast concrete (PC) piles becomes redundant. The existence of the interlocking structure brings several drawbacks: (1) It increased the manufacturing cost and complexity of steel pipe piles; (2) Extremely high verticality is required during pile driving; otherwise, the interlocking joints may seize up, making construction difficult. (3) It is difficult to unlock the pile during the extraction process, which can easily cause damage to the pile body, reduce the recycling rate and reuse value.

[0004] Therefore, there is an urgent need in this field for a more economical and efficient PC pile support structure optimized for impermeable strata. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a retaining structure for impermeable strata that is simplified in structure, convenient in construction, low in cost, and easy to recycle.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model discloses a PC method pile support structure for impermeable strata, comprising multiple steel pipe piles and multiple steel sheet piles. The steel sheet piles are arranged between two adjacent steel pipe piles, and the flange side of the steel sheet pile is in direct contact with the outer wall of the steel pipe pile. They are tightly bonded by the lateral pressure of the surrounding soil to form a continuous retaining wall.

[0007] This utility model discloses a PC method pile support structure for impermeable strata, wherein the steel pipe piles and steel sheet piles are arranged alternately at equal intervals.

[0008] This utility model discloses a PC method pile support structure for impermeable strata. Further, the steel sheet pile includes a web and flange sides formed on opposite sides of the web width direction. The flange sides are arranged in a figure-eight shape, and the flange sides and the web form a U-shaped structure with the opening gradually increasing from the inside to the outside.

[0009] This utility model discloses a PC method pile support structure for impermeable strata. Furthermore, the junction of the web and the flange side is provided with an arc-shaped chamfer.

[0010] This utility model discloses a PC method pile support structure for impermeable strata, further wherein the cross-section at the arc-shaped chamfer is enlarged.

[0011] This utility model discloses a PC method pile support structure for impermeable strata. Further, it also includes a positioning component located at the upper end of the steel pipe pile for guiding the steel sheet pile. The positioning component includes a positioning plate located between two adjacent steel pipe piles and attached to the side wall of the web, a positioning angle plate located between the flange side and the steel pipe pile and attached to the flange side and the outer wall of the steel pipe pile respectively, and a positioning arc plate located on the inner wall of the steel pipe pile. The upper ends of the positioning plate, the positioning angle plate and the positioning arc plate are connected.

[0012] This utility model discloses a PC method pile support structure for impermeable strata. Further, the positioning angle plate has an inclined plane at its contact point with the flange side, matching the slope of the flange side; and an arc surface at its contact point with the steel pipe pile, matching the curvature of the outer wall of the steel pipe pile. The positioning plate also has an arc surface at its contact point with the steel pipe pile, matching the curvature of the steel pipe pile. The curvature of the positioning arc plate matches the curvature of the inner wall of the steel pipe pile.

[0013] This utility model discloses a PC method pile support structure for impermeable strata. Furthermore, the lower ends of the positioning plate, positioning corner plate, and positioning arc plate are provided with cutting edges.

[0014] Compared with the prior art, this utility model has the following advantages: 1. By eliminating redundant interlocking structures, the raw material and processing costs of steel pipe piles are directly reduced. The simplified structure avoids the risk of interlocking damage, improves the durability and recyclability of components, and conforms to the concept of green construction; 2. The lockless design makes pile driving and extraction operations simple and quick, eliminating the need to consider lock alignment and unlocking issues, greatly reducing construction difficulty and time, and improving construction efficiency; 3. Although the interlocking joints are eliminated, a well-integrated composite retaining structure is formed through the interaction between the steel pipe piles, sheet piles, and soil. The steel pipe piles provide the main bending stiffness, while the sheet piles fill the gaps and transmit earth pressure, resulting in a clearly defined and reliable structural stress distribution. 4. By designing positioning components, the positioning components achieve position positioning and fixation through the cooperation of steel pipe piles with positioning arc plates, positioning plates and positioning corner plates. The positioning components have a guiding and positioning function for steel sheet piles, which facilitates the installation of steel sheet piles; 5. This application accurately identifies the specific working condition of "impermeable strata", solves the problem of "over-design" of traditional technologies under this condition, and realizes the customization and optimization of the technical solution.

[0015] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the support structure of this utility model; Figure 2 This is a diagram showing the fit between the steel pipe pile, steel sheet pile, and positioning component of this utility model; Figure 3 This is a top view of the positioning component of this utility model; Figure 4 This is a front view of the positioning component of this utility model; Figure 5 This is a side view of the positioning arc plate of this utility model.

[0017] Figure label: 1. Steel pipe pile; 2. Steel sheet pile; 2.1 Web plate; 2.2 Flange side; 3. Positioning component; 3.1 Positioning plate; 3.2 Positioning angle plate; 3.3 Positioning arc plate; 3.4 Cutting edge. Detailed Implementation

[0018] like Figures 1-5 As shown, this utility model discloses a PC method pile support structure for impermeable strata, including multiple steel pipe piles 1 and multiple steel sheet piles 2. The steel pipe piles 1 and steel sheet piles 2 are arranged alternately at equal intervals. The steel sheet piles 2 are located between two adjacent steel pipe piles 1. The flange side 2.2 of the steel sheet pile 2 is in direct contact with the outer wall of the column body of the steel pipe pile 1, and they are tightly bonded by the lateral pressure of the surrounding soil to form a continuous retaining wall.

[0019] The sheet pile 2 includes a web 2.1 and flange sides 2.2 formed on the same side of the web 2.1 and located on both sides of the width direction of the web 2.1. The flange sides 2.2 are arranged in a figure-eight shape, and the flange sides 2.2 and the web 2.1 form a U-shaped structure with the opening gradually increasing from the inside to the outside. The opening side of the sheet pile 2 is away from the foundation pit side. By utilizing the gradually increasing opening design of the sheet pile 2, the sheet pile 2 can be tightly attached to the outer wall of the steel pipe pile 1 under the lateral pressure of the surrounding soil, thereby forming a continuous retaining wall.

[0020] An arc-shaped chamfer is provided at the junction of the web 2.1 and the flange side 2.2, and the cross section at the arc-shaped chamfer is designed to protect the outer steel pipe pile 1 from damage and increase the rigidity of the steel sheet pile 2 to prevent it from deforming under the action of earth pressure.

[0021] Furthermore, due to the elimination of the interlocking design of the steel pipe pile 1, the positioning and verticality of the steel sheet pile 2 are difficult to control. Therefore, this application provides a positioning element 3 at the upper end of the steel pipe pile 1 for guiding and positioning the steel sheet pile 2. The positioning element 3 includes a positioning plate 3.1 located between two adjacent steel pipe piles 1 and attached to the side wall of the web 2.1; a positioning angle plate 3.2 located between the flange side 2.2 and the steel pipe pile 1 and attached to both the flange side 2.2 and the outer wall of the steel pipe pile 1; and a positioning angle plate 3.2 located on the steel... The positioning arc plate 3.3 on the inner wall of the pipe pile 1, the positioning arc plate 3.3, the positioning plate 3.1 and the positioning corner plate 3.2 are respectively located on the inner and outer sides of the steel pipe pile 1. The positioning plate 3.1, the positioning corner plate 3.2 and the upper end of the positioning arc plate 3.3 are connected. The positioning component 3 achieves position positioning and fixation through the cooperation between the steel pipe pile 1 and the positioning arc plate 3.3, the positioning plate 3.1 and the positioning corner plate 3.2. The positioning component 3 has a guiding and positioning function for the steel sheet pile 2, which facilitates the installation of the steel sheet pile 2.

[0022] The positioning angle plate 3.2 has an inclined plane at the contact point with the flange side 2.2, which has the same slope as the flange side 2.2. The positioning plate 3.1 has an arc surface at the contact point with the steel pipe pile 1, which matches the curvature of the outer wall surface of the steel pipe pile 1. The positioning plate 3.1 has an arc surface at the contact point with the steel pipe pile 1, which matches the curvature of the steel pipe pile 1. The curvature of the positioning arc plate 3.3 matches the curvature of the inner wall surface of the steel pipe pile 1. Through the above settings, the installation accuracy of the positioning component 3 and its compatibility with the steel pipe pile 1 are increased, making it easier to install the steel sheet pile 2 subsequently.

[0023] The lower ends of the positioning plate 3.1, the positioning corner plate 3.2, and the positioning arc plate 3.3 are provided with cutting edges 3.4 to facilitate pressing the positioning component 3 into the soil.

[0024] The construction method is as follows: S1. Driving steel pipe pile 1: The steel pipe pile 1 is driven in using a pile driver. Its flatness and verticality should be well controlled.

[0025] S2. Drive in sheet piles 2: Install positioning components 3 and insert sheet piles 2 between steel pipe piles 1 using a pile driver. The flatness and verticality of the sheet piles should be well controlled, and they should be in close contact with the outer wall of the steel pipe piles 1.

[0026] S3, the construction of steel pipe pile 1 and steel sheet pile 2 is carried out alternately.

[0027] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A PC (polycarbonate) pile support structure for impermeable strata, characterized in that, It includes multiple steel pipe piles (1) and multiple steel sheet piles (2). The steel sheet piles (2) are located between two adjacent steel pipe piles (1). The flange side (2.2) of the steel sheet pile (2) is in direct contact with the outer wall of the steel pipe pile (1) and is tightly bonded by the lateral pressure of the surrounding soil to form a continuous retaining wall.

2. The PC pile support structure for impermeable strata according to claim 1, characterized in that, The steel pipe piles (1) and steel sheet piles (2) are arranged alternately at equal intervals.

3. A PC pile support structure for impermeable strata according to claim 1, characterized in that, The sheet pile (2) includes a web (2.1) and flange sides (2.2) formed on opposite sides of the web (2.1) in the width direction. The flange sides (2.2) are arranged in a figure-eight shape. The flange sides (2.2) and the web (2.1) form a U-shaped structure with the opening gradually increasing from the inside to the outside.

4. A PC pile support structure for impermeable strata according to claim 3, characterized in that, The junction of the web (2.1) and the flange side (2.2) is provided with an arc-shaped chamfer.

5. A PC pile support structure for impermeable strata according to claim 4, characterized in that, The cross-section is enlarged at the curved chamfer.

6. A PC pile support structure for impermeable strata according to any one of claims 3-5, characterized in that, It also includes a positioning component (3) located at the upper end of the steel pipe pile (1) for guiding the steel sheet pile (2). The positioning component (3) includes a positioning plate (3.1) located between two adjacent steel pipe piles (1) and attached to the side wall of the web plate (2.1), a positioning angle plate (3.2) located between the flange side (2.2) and the steel pipe pile (1) and attached to the flange side (2.2) and the outer wall of the steel pipe pile (1) respectively, and a positioning arc plate (3.3) located on the inner wall of the steel pipe pile (1). The upper ends of the positioning plate (3.1), the positioning angle plate (3.2) and the positioning arc plate (3.3) are connected.

7. A PC pile support structure for impermeable strata according to claim 6, characterized in that, The positioning angle plate (3.2) has an inclined plane with the same slope as the flange side (2.2) at the contact point with the flange side (2.2), and an arc surface that matches the curvature of the outer wall surface of the steel pipe pile (1) at the contact point with the steel pipe pile (1); the positioning plate (3.1) has an arc surface that matches the curvature of the steel pipe pile (1) at the contact point with the steel pipe pile (1); the curvature of the positioning arc plate (3.3) matches the curvature of the inner wall surface of the steel pipe pile (1).

8. A PC pile support structure for impermeable strata according to claim 6, characterized in that, The lower ends of the positioning plate (3.1), positioning corner plate (3.2) and positioning arc plate (3.3) are provided with cutting edges (3.4).

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