Suspension joint bar vibration immersed tube shear-resistant CFG pile and CFG pile composite foundation

Abstract

The utility model provides a suspension joint bar vibration immersed tube anti-shear CFG pile and a CFG pile composite foundation, the anti-shear CFG pile comprises a pile cap, a pile body, a reinforcement cage and a suspension reinforcement, the pile cap and the pile body are made of CFG materials, and the suspension reinforcement is fixed at one end of the reinforcement cage; the pile cap and the pile body are both of a columnar structure, the pile cap is connected with the top of the pile body, and the pile cap and the pile body form a T-shaped structure. The reinforcement cage is embedded in the pile body, and main reinforcements of the reinforcement cage are parallel to the center axis of the pile body. The hanging steel bars are embedded in the pile cap. The composite foundation is composed of CFG piles with different lengths, and the CFG pile composite foundation comprises the suspension joint bar vibration immersed tube shear-resistant CFG pile. The CFG pile disclosed by the utility model has good shear resistance, and can be combined with a conventional CFG pile to effectively reinforce a soft soil foundation with potential sliding damage risk.

Description

Technical Field

[0001] The utility model specifically relates to a suspended reinforcing bar vibration-sunk tube shear-resistant CFG pile and a CFG pile composite foundation. Background Art

[0002] Cement fly ash gravel piles are high bond strength piles (CFG piles for short) formed by mixing cement, fly ash, gravel, stone chips or sand with water. The piles and the soil cushion layer between the piles together constitute a composite foundation.

[0003] CFG piles offer high single-pile bearing capacity, significantly increasing foundation bearing capacity. CFG pile composite foundations feature minimal deformation and a wide range of applications. Vibratory sinking CFG piles, a type of CFG pile, utilize vibratory sinking to create a hole, pour the CFG pile mix, and then construct the pile while the pipe is being pulled out. This method offers high construction efficiency and low costs.

[0004] The stress and deformation characteristics of CFG piles are similar to those of plain concrete piles, which means that CFG piles have poor shear resistance. Therefore, their application in soft soil foundations with potential sliding damage is greatly limited. Summary of the Invention

[0005] The first purpose of the utility model is to provide a suspended reinforcing bar vibration-sunk tube shear-resistant CFG pile.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A suspended rebar-inserted vibration-sunk tube shear-resistant CFG pile, comprising a pile cap, a pile body, a steel cage, and hanging steel bars, wherein the pile cap and the pile body are made of CFG material, and the hanging steel bars are fixed to one end of the steel cage;

[0008] The pile cap and the pile body are both columnar structures, and the pile cap is connected to the top of the pile body to form a T-shaped structure with the pile body;

[0009] The steel cage is embedded in the pile body and the main bars of the steel cage are parallel to the central axis of the pile body; the hanging steel bars are embedded in the pile cap.

[0010] As a preferred embodiment, the top of the steel cage is flush with the top of the pile body, so that the pile cap only contains the hanging steel bar structure.

[0011] As a preferred embodiment, the steel cage and the hanging steel bars are connected by welding.

[0012] As a preferred embodiment, the length of the steel cage does not exceed the length of the pile body.

[0013] As a preferred embodiment, the pile cap, pile body, steel cage and hanging steel bars form an integrated structure.

[0014] Another object of the present invention is to provide a CFG pile composite foundation, wherein the composite foundation is composed of CFG piles of different lengths, and the CFG pile composite foundation includes the above-mentioned suspended rebar vibration-sunk tube shear-resistant CFG piles.

[0015] As a preferred embodiment, the CFG pile composite foundation is composed of a foundation to be reinforced, ordinary CFG piles and the suspended reinforcing bar vibration-sunk tube shear-resistant CFG piles.

[0016] As a preferred embodiment, the CFG pile composite foundation is buried in the foundation to be reinforced, and the suspended rebar vibration-sunk tube shear-resistant CFG piles are arranged in the potential sliding area of ​​the foundation.

[0017] As a preferred embodiment, the length of the steel cage is greater than the depth of the potential sliding surface in the potential sliding area.

[0018] As a preferred embodiment, the CFG piles constituting the composite foundation are arranged in an arc shape with a long middle and short sides.

[0019] The utility model overcomes the shortcoming of poor shear resistance of conventional CFG piles, and provides suspended rebar vibration-sunk tube shear-resistant CFG piles, which can give full play to the advantages of high bearing capacity, high efficiency and low cost of CFG piles. The utility model also provides a composite foundation using shear-resistant CFG piles, and the shear-resistant CFG piles are set on the potential sliding surface of the soft soil foundation, which can effectively reinforce the soft soil foundation with potential sliding damage risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the suspended rebar-inserted vibration-sunk tube shear-resistant CFG pile of the utility model.

[0021] Figure 2 Schematic diagram of the suspended steel cage structure.

[0022] Figure 3 CFG piles are set up in a soft soil foundation section with potential sliding surface to reinforce and form a composite foundation.

[0023] In the figure, 1, pile cap, 2, pile body, 3, reinforcement cage, 4, pile top elevation, 5, hanging reinforcement, 6, embankment, 7, potential sliding surface. DETAILED DESCRIPTION

[0024] Example 1

[0025] This embodiment specifically describes the structure of the shear-resistant CFG pile of the present invention. Figure 1-2As shown, the suspended, inserted-bar, vibration-sunk tube shear-resistant CFG pile of the present invention comprises a pile cap 1, a pile body 2, a steel cage 3 and hanging steel bars 5. The pile cap 1 and pile body 2 are made of CFG material, and the hanging steel bars 5 are fixed to one end of the steel cage 3. The pile cap 1 and pile body 2 are both columnar structures, and the pile cap 1 is connected to the top of the pile body 2, forming a T-shaped structure with the pile body 2. The steel cage 3 is buried in the pile body 2, and the main bars of the steel cage 3 are parallel to the central axis of the pile body 1. The hanging steel bars 5 are buried in the pile cap 1. The top of the steel cage 3 is flush with the top of the pile body 2, so that the pile cap 1 only contains the hanging steel bars 5. The steel cage 3 and the hanging steel bars 5 are welded. The length of the steel cage 3 does not exceed the length of the pile body 2. The pile cap 1, pile body 2, steel cage 3 and hanging steel bars 5 form an integrated structure.

[0026] Example 2

[0027] This embodiment provides a CFG composite foundation.

[0028] A road embankment with 6 slopes is planned to be built on a soft soil foundation, where a certain section is as follows Figure 3 As shown in the figure, the soft soil foundation has insufficient bearing capacity and requires a CFG pile composite foundation. Based on the design calculations, a long and short pile arrangement is used. Preliminary analysis indicates that the foundation may be subject to sliding failure (potential sliding surface 7 can be identified using existing methods). Therefore, shear-resistant piles are required to resist sliding. Therefore, the shear-resistant CFG piles described in Example 1 are introduced into the CFG composite foundation. Figure 3 Among them, 1#~4# piles adopt conventional vibration-sunk CFG piles, and 5#~7# piles adopt the suspended dowel vibration-sunk shear-resistant CFG piles in Example 1.

[0029] In this embodiment, the pile diameter is 350 mm, and the pile lengths are: 1# and 7# are 6 m long, 2# and 6# are 8 m long, and 3# to 5# are 10 m long. Therefore, the length of the immersed tube is selected to be 10 m. Based on the existing anti-sliding analysis method, it is determined that the 5# pile needs to be inserted with a steel cage of 1 m, the 6# pile needs to be inserted with a steel cage of 3 m, and the 7# pile needs to be inserted with a steel cage of 4 m. In this embodiment, the steel cage is used. Figure 2 The diameter is 89 mm, and stirrups are distributed along the extension direction of the main reinforcement (length direction).

[0030] Finally, it should be noted that the schematic diagrams provided in the accompanying drawings are only used to illustrate the technical solution of the present invention, and are not intended to limit the same. Those skilled in the art may modify or adjust the type of hanging steel bars (using U-shaped or gate-shaped types, welding the steel cage into an integral connection, etc.) and the structural type of the steel cage (such as adding stirrups or steel rings inside or outside along the length direction to strengthen the integrity of the steel cage). These modifications or adjustments do not cause the essence of the corresponding technical solution to deviate from the scope of the present invention.

Claims

1. A suspended reinforcing bar vibration sinking tube shear resistant CFG pile, characterized in that: It includes a pile cap, a pile body, a steel cage and hanging steel bars. The pile cap and the pile body are made of CFG material. The hanging steel bars are fixed to one end of the steel cage. The pile cap and the pile body are both columnar structures, and the pile cap is connected to the top of the pile body to form a T-shaped structure with the pile body; The steel cage is embedded in the pile body and the main bars of the steel cage are parallel to the central axis of the pile body; the hanging steel bars are embedded in the pile cap.

2. The CFG pile according to claim 1, characterized in that: The top of the steel cage is flush with the top of the pile body, so that the pile cap only contains the hanging steel bar structure.

3. The CFG pile according to claim 1, characterized in that: The steel cage and the hanging steel bars are connected by welding.

4. The CFG pile according to claim 1, characterized in that: The length of the steel cage does not exceed the length of the pile body.

5. The CFG pile according to claim 1, characterized in that: The pile cap, pile body, steel cage and hanging steel bars form an integrated structure.

6. A CFG pile composite foundation, said composite foundation being composed of CFG piles of different lengths, characterized in that: The CFG pile composite foundation comprises the suspended rebar vibration-sunk tube shear-resistant CFG pile according to any one of claims 1 to 5.

7. The CFG pile composite foundation according to claim 6, characterized in that: The CFG pile composite foundation is composed of a foundation to be reinforced, common CFG piles and the suspended reinforcing bar vibration-sunk tube shear-resistant CFG piles.

8. The CFG pile composite foundation according to claim 6, characterized in that: The CFG pile composite foundation is buried in the foundation to be reinforced, and the suspended rebar vibration-sunk tube shear-resistant CFG piles are arranged in the potential sliding area of ​​the foundation.

9. The CFG pile composite foundation according to claim 8, characterized in that: The length of the steel cage is greater than the depth of the potential sliding surface in the potential sliding area.

10. The CFG pile composite foundation according to claim 6, characterized in that: The CFG piles constituting the composite foundation are arranged in an arc shape with a long middle and short sides.

Images