Foam light soil-pile foundation composite structure for high-speed rail close approach roadbed

Abstract

The utility model relates to the field of roadbed discloses a kind of foam light soil-pile foundation composite structure for high-speed rail close approach roadbed, including EPS pile bubble light soil superlight composite roadbed structure, when using the device, it is convenient to optimize structure stress and weight loss effect by the filling cavity and vertical baffle of the device, wherein the filling cavity is divided into first filling cavity, second filling cavity, third filling cavity, vertical baffle and cross baffle constitute support framework, filling hole is convenient for filling material uniform distribution, while guaranteeing anti-settling capacity in reducing structure deadweight, adapt to the stringent requirement of high-speed rail close approach roadbed, realize the accurate assembly and stable connection of pile main body and pile top by the embedding positioning block and embedding positioning slot of setting, wherein four groups of embedding positioning block are inserted into embedding positioning slot of pile main body, form reliable positioning constraint, avoid structure misplacement caused by high-speed rail operation vibration, pavement structure layer is laid on pile top, further improve overall bearing stability.

Description

Technical Field

[0001] This utility model relates to the field of roadbed, specifically a foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbeds. Background Technology

[0002] The background technology of composite structures used in high-speed railway subgrades originates from the development of railway subgrade engineering. In the early stages, it mainly combined traditional pile foundations with concrete subgrades. As high-speed railways have increased their requirements for lightweight and high-stability subgrades, new materials such as foamed lightweight soil have been gradually incorporated to form a preliminary composite structure. Its core function is to provide stable subgrade support for high-speed railway lines, distribute train loads, control settlement and deformation, and ensure track smoothness. Its application scenarios are concentrated in subgrade engineering projects where high-speed railway lines cross soft soil foundations, are near existing structures, or have complex terrain, such as the subgrade construction of urban high-speed railway hubs and high-speed railway bridge sections crossing rivers, providing a basic guarantee for the safe and stable operation of high-speed railways.

[0003] However, it still has some drawbacks. For example, the connection between the pile body and the pile top of the traditional high-speed railway near-subgrade composite structure is mostly rigid welding or simple overlap, without a dedicated positioning structure. It is easy to cause uneven stress due to construction errors. Under the long-term action of high-speed railway vibration, it is easy to loosen and crack. Its interior is mostly solid or single cavity design, without layered cavities and supporting partitions, making it difficult to balance self-weight and bearing capacity. Either the self-weight is too large, increasing the foundation load, or the strength is insufficient, which easily causes settlement. The filling material is unevenly distributed, and there are no filling holes to guide the flow, resulting in large differences in the internal density of the structure. Local stress concentration is easy to form, and the overall vibration fatigue resistance is poor, making it difficult to adapt to the harsh working conditions of high-frequency vibration of high-speed railway.

[0004] To address the aforementioned issues, this application proposes a foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbeds. Utility Model Content

[0005] The purpose of this invention is to provide a foamed lightweight soil-pile foundation composite structure for high-speed railway subgrade, in order to solve the problem of poor overall vibration fatigue resistance mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbed, comprising an EPS pile foamed lightweight soil ultralight composite roadbed structure, wherein the EPS pile foamed lightweight soil ultralight composite roadbed structure includes a pile body and a pile top.

[0007] Preferably, an embedded positioning block is fixedly connected to the lower outer surface of the pile top, and there are four sets of embedded positioning blocks located on the four sides respectively. A road structure layer is fixedly connected to the upper outer surface of the pile top.

[0008] Preferably, an embedded positioning groove is provided around the upper outer surface of the pile body, and an embedded positioning block is movably connected to the outer surface of the inner wall of the embedded positioning groove.

[0009] Preferably, the pile body has a filling cavity inside, the filling cavity including a first filling cavity, a second filling cavity and a third filling cavity.

[0010] Preferably, both the first filling cavity and the second filling cavity include a vertical partition, a horizontal partition, and filling holes. Filling holes are provided on both outer surfaces of the horizontal partition, and a vertical partition is fixedly connected to one outer surface of the horizontal partition.

[0011] Preferably, a second filling cavity is fixedly connected to the lower outer surface of the first filling cavity, and a third filling cavity is fixedly connected to the lower outer surface of the second filling cavity. The third filling cavity includes a vertical partition and a horizontal partition. The second filling cavity is fixedly connected to the outer surface of one end of the vertical partition, and the other end is fixedly connected to the upper outer surface of the horizontal partition.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model facilitates precise assembly and stable connection between the pile body and the pile top through the setting of embedded positioning blocks and embedded positioning grooves. The four sets of embedded positioning blocks are correspondingly inserted into the embedded positioning grooves of the pile body to form a reliable positioning constraint, avoiding structural misalignment caused by high-speed rail operation vibration. The road structure layer is laid on the pile top, further improving the overall load-bearing stability.

[0013] This utility model, through the design of filling cavities and vertical partitions, facilitates the optimization of structural stress and weight reduction. The filling cavities are divided into a first filling cavity, a second filling cavity, and a third filling cavity. The vertical partitions and horizontal partitions form a supporting frame. The filling holes facilitate the uniform distribution of filling material, reducing the structural self-weight while ensuring anti-settlement capability, and meeting the stringent requirements of high-speed railway subgrades. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbeds according to this utility model. Figure 2 This is a schematic diagram of the main pile structure of a foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbeds according to this utility model. Figure 3 This is a schematic diagram of the pile top structure of a foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbed according to the present invention. Figure 4 This is a schematic diagram of the internal cavity structure of a foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbeds according to the present invention.

[0015] In the diagram: 1. EPS pile, bubble-filled lightweight soil, ultra-lightweight composite roadbed structure; 2. Pile body; 3. Pile top; 4. Embedded positioning groove; 5. Embedded positioning block; 6. Filling cavity; 7. Vertical diaphragm; 8. Horizontal diaphragm; 9. Filling hole; 10. First filling cavity; 11. Second filling cavity; 12. Third filling cavity; 13. Road surface structure layer. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Please see Figures 1-4 An EPS pile lightweight soil-pile composite structure for high-speed railway adjacent roadbeds includes an EPS pile lightweight soil ultralight composite roadbed structure 1. The EPS pile lightweight soil ultralight composite roadbed structure 1 includes a pile body 2 and a pile top 3. Through the setting of embedded positioning blocks 5 and embedded positioning grooves 4, it is easy to realize the precise assembly and stable connection of the pile body 2 and the pile top 3. The four sets of embedded positioning blocks 5 are correspondingly inserted into the embedded positioning grooves 4 of the pile body 2 to form a reliable positioning constraint, avoiding structural misalignment caused by high-speed railway operation vibration. The road surface structure layer 13 is laid on the pile top 3 to further improve the overall bearing stability.

[0018] In this embodiment, as shown... Figures 1-2 As shown, an embedded positioning block 5 is fixedly connected to the lower outer surface of the pile top 3. There are four sets of embedded positioning blocks 5, which are located on the four sides respectively. A road structure layer 13 is fixedly connected to the upper outer surface of the pile top 3. An embedded positioning groove 4 is provided around the upper outer surface of the pile body 2. An embedded positioning block 5 is movably connected to the outer surface of the inner wall of the embedded positioning groove 4. A filling cavity 6 is provided inside the pile body 2. The filling cavity 6 includes a first filling cavity 10, a second filling cavity 11, and a third filling cavity 12.

[0019] In this embodiment, as shown Figures 3-4As shown, both the first filling cavity 10 and the second filling cavity 11 include vertical partitions 7, horizontal partitions 8, and filling holes 9. Filling holes 9 are provided on both outer surfaces of the horizontal partitions 8. The vertical partitions 7 are fixedly connected to one outer surface of the horizontal partitions 8. The second filling cavity 11 is fixedly connected to the lower outer surface of the first filling cavity 10. The third filling cavity 12 is fixedly connected to the lower outer surface of the second filling cavity 11. The third filling cavity 12 includes vertical partitions 7 and horizontal partitions 8. The second filling cavity 11 is fixedly connected to one outer surface of the vertical partitions 7, and the other end is fixedly connected to the upper outer surface of the horizontal partitions 8. The filling cavities 6 and vertical partitions 7 facilitate the optimization of structural stress and weight reduction. The filling cavities 6 are divided into the first filling cavity 10, the second filling cavity 11, and the third filling cavity 12. The vertical partitions 7 and horizontal partitions 8 form a supporting frame. The filling holes 9 facilitate the uniform distribution of filling material, ensuring anti-settlement capacity while reducing the structural self-weight, and meeting the stringent requirements of high-speed rail near the roadbed.

[0020] Working principle A foamed lightweight soil-pile composite structure for high-speed railway subgrade is disclosed. The composite structure is based on EPS pile foamed lightweight soil ultralight composite subgrade structure 1. The pile body 2 is precisely connected and fixed to the pile top 3 by embedded positioning block 5 through embedded positioning groove 4. The pile top 3 bears the high-speed railway load transmitted by the pavement structure layer 13. The vertical diaphragm 7 and horizontal diaphragm 8 inside the pile body 2 form a support system, dividing the filling cavity 6 into three independent cavities. The filling material is injected into each cavity through filling holes 9 to form a lightweight and high-strength composite structure, which effectively disperses the load, resists settlement, and ensures the stability of the subgrade during high-speed railway operation.

[0021] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbeds, comprising an EPS pile-foamed lightweight soil ultralight composite roadbed structure (1), characterized in that: The EPS pile bubble lightweight soil ultralight composite roadbed structure (1) includes the pile body (2) and the pile top (3).

2. The foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbed according to claim 1, characterized in that: An embedded positioning block (5) is fixedly connected to the lower outer surface of the pile top (3). There are four sets of embedded positioning blocks (5) on the four sides respectively. A road structure layer (13) is fixedly connected to the upper outer surface of the pile top (3).

3. The foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbed according to claim 2, characterized in that: An embedded positioning groove (4) is provided around the upper outer surface of the pile body (2), and an embedded positioning block (5) is movably connected to the inner wall of the embedded positioning groove (4).

4. A foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbed as described in claim 3, characterized in that: The pile body (2) has a filling cavity (6) inside, which includes a first filling cavity (10), a second filling cavity (11), and a third filling cavity (12).

5. A foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbed according to claim 4, characterized in that: Both the first filling cavity (10) and the second filling cavity (11) include a vertical partition (7), a horizontal partition (8), and filling holes (9). Filling holes (9) are provided on both outer surfaces of the horizontal partition (8), and a vertical partition (7) is fixedly connected to one outer surface of the horizontal partition (8).

6. A foamed lightweight soil-pile foundation composite structure for high-speed railway adjacent roadbed according to claim 5, characterized in that: The lower outer surface of the first filling cavity (10) is fixedly connected to the second filling cavity (11), and the lower outer surface of the second filling cavity (11) is fixedly connected to the third filling cavity (12). The third filling cavity (12) includes a vertical partition (7) and a horizontal partition (8). The outer surface of one end of the vertical partition (7) is fixedly connected to the second filling cavity (11), and the other end is fixedly connected to the upper outer surface of the horizontal partition (8).

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