CN208039229U - A kind of novel Prefabricated composite stake - Google Patents

Abstract

The utility model relates to a novel prefabricated composite pile, which belongs to the technical field of construction pile foundation engineering and is designed for solving the problems of low compressive and pull-out bearing capacity of pile foundations in soft soil foundations. The utility model is composed of an upper pile body, a wedge-shaped wing plate, an arc-shaped rib plate, a grouting hole, a lower pile body, a flange and a pile tip; the upper pile body is a hollow variable-section pile body, and the large-section pile body There are 4 symmetrically distributed wedge-shaped flanges around the perimeter. The cross-section of the wedge-shaped flange is trapezoidal. The small-section pile body is provided with grouting holes. There are 4 symmetrically distributed arc-shaped ribs between the upper and lower large-section pile bodies. The lower pile body is a circular platform, the cross-section gradually decreases from top to bottom, the outer surface of the pile body is provided with a flange, and the angle between the lower end surface of the flange and the pile body is 30°. The structure is easy to construct and has high strength of the pile body, which can realize the reinforcement of the soil around the pile, greatly improve the frictional resistance of the pile side, and has relatively good compression and pullout bearing capacity, and can be widely used in various types of soft soil foundations.

Description

A new type of prefabricated composite pile

technical field

The utility model belongs to the technical field of building pile foundation engineering, in particular to a composite pile, in particular to a novel prefabricated composite pile.

Background technique

my country has a vast territory, complex geological conditions, and widely distributed soft soil strata of various origins. In particular, there are many complex soft soil foundations in my country's coastal areas, along lakes, and along rivers. Soft soil foundations have high natural moisture content and pores. Due to the characteristics of large ratio, low strength, and large deformation, it is often in a soft plastic or flow plastic state. The soft soil foundation must be reinforced to meet the safety and use requirements of the design. It is precisely because of these shortcomings that the soft soil foundation encountered in the project must be treated to meet the safety and use requirements of the design. When the soft soil foundation is thick and it is difficult to carry out deep treatment on a large area, piling is often used for treatment. The pile side friction resistance in the soft soil foundation is the main controlling factor. The surface of the ordinary prefabricated tubular pile is smooth and round, and the pile side friction resistance is relatively small. Therefore, in order to solve the above problems, under the support of the National Natural Science Foundation of China (No. 41372288) , carried out a large number of data searches, on-site investigations and related experiments for research, and a new type of prefabricated composite pile was developed to realize the reinforcement of soft soil foundation, thereby improving the bearing capacity of the foundation and reducing the uneven settlement of the foundation.

Contents of the invention

The purpose of this utility model is: to provide a new type of prefabricated composite pile, which can realize the reinforcement of the soil around the pile, greatly improve the frictional resistance of the pile side, thereby effectively improving the compressive and pullout bearing capacity of the pile in the soft soil foundation.

The technical scheme adopted by the utility model is: a new type of prefabricated composite pile, which is composed of an upper pile body, a wedge-shaped wing plate, an arc-shaped rib plate, a grouting hole, a lower pile body, a flange and a pile tip; The upper pile body is a hollow variable-section pile body. There are four symmetrically distributed wedge-shaped flanges around the large-section pile body. The cross-section of the wedge-shaped flange is trapezoidal. There are four symmetrically distributed arc-shaped ribs between the body; the lower pile body is a circular platform body, the cross-section gradually decreases from top to bottom, and the outer surface of the pile body is provided with a flange, and the lower end surface of the flange is connected to the The angle between the pile body is 30°.

The construction and use method of the utility model is: a new type of prefabricated composite pile. During construction, use a pile driver to slowly drive the prefabricated composite pile into the foundation to the design elevation, and control the verticality of the pile body during the driving process to not exceed 0.5%; After the prefabricated composite pile is driven into the design elevation of the foundation, the pile driver is removed, and the high-pressure grouting equipment is connected to the hollow part of the pile top for grouting operation, so that the grout enters the pile body, and the grout fills the pile body from the grouting The grout hole seeps into the soft soil layer around the pile and fills the gap between the upper pile body and the surrounding soil layer. After hardening, it is combined with the upper pile body and the wedge-shaped wing plate to complete the construction.

The working principle of the utility model is: a new type of prefabricated composite pile, the upper pile body is equipped with a wedge-shaped wing plate around the pile body with a large cross-section, which increases the contact area with the surrounding soil, and is embedded in the soil layer to improve the height of the pile. Side friction resistance; there are arc-shaped ribs between the upper and lower large-section piles, which connect the large-section piles together, improving the stability and bearing capacity of the piles. The large-section piles and small-section piles are combined alternately. The pile is similar to a bamboo pile, thereby improving the side friction of the pile; the small-section pile body is provided with a grouting hole, which can inject grout into the gap between the pile and the soil to form a stone body, and make the pile body and the surrounding soil body The connection is more firm, which strengthens the foundation around the pile and improves the bearing capacity of the pile body; the cross section of the pile body in the lower part gradually decreases from the bottom to the top, and becomes a pile body with variable cross-section. To increase the contact area between the pile body and the surrounding soil, improve the pile side friction; the flange can be closely combined with the soil, so that the force of the pile body and the force of the soil are coordinated, thereby increasing the pile foundation. Stability and compression performance; the small section of the upper pile body is provided with a grouting hole, which can inject grout into the gap between the pile and the soil to form a stone body, making the connection between the pile body and the surrounding soil more firm, thereby The foundation around the pile is reinforced to improve the compressive and pull-out bearing capacity of the pile body.

The beneficial effects of the utility model are: a new type of prefabricated composite pile, the cross section of the lower pile body gradually decreases from top to bottom and the angle between the flange and the pile body is 30°, which can be easily driven into the foundation, and the upper part is large There are wedge-shaped wing plates around the cross-section pile body, and arc-shaped rib plates are arranged between the upper and lower large-section pile bodies. The wedge-shaped wing plates and arc-shaped rib plates will have a synergistic effect with the surrounding soil layer, which can effectively improve the soil around the pile. The physical and mechanical properties of the pile body, thereby improving the bearing capacity of the pile body; the small cross-section pile body is equipped with grouting holes, which can inject grout into the gap between the pile and the soil to form a stone body, so that the pile body and the surrounding soil are more firmly connected. Therefore, the foundation around the pile is reinforced, and the bearing capacity of the pile is improved; the outer surface of the lower pile is provided with a flange, which can be closely combined with the soil, so that the force of the pile and the force of the soil are coordinated, thereby increasing the load capacity of the pile. The stability, compression and pullout performance of the pile foundation can be improved, so as to exert the load-bearing characteristics of the pile and improve the reliability of the project.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a novel prefabricated composite pile of the present invention.

Fig. 2 is a top view of the upper pile body of a new type of prefabricated composite pile according to the utility model.

Reference signs: (1) upper pile body; (2) wedge-shaped flange; (3) arc-shaped rib; (4) grouting hole; (5) lower pile body; (6) flange; (7) pile tip.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, a new type of prefabricated composite pile consists of an upper pile body (1), a wedge-shaped wing plate (2), an arc-shaped rib plate (3), a grouting hole (4), and a lower pile body (5). , flange (6) and pile tip (7); it is characterized in that the upper pile body (1) is a hollow variable-section pile body, and four symmetrically distributed wedge-shaped wings are arranged around the large-section pile body plate (2), the wedge-shaped wing plate (2) has a trapezoidal cross-section, the small-section pile body is provided with grouting holes (4), and there are four symmetrically distributed arc-shaped ribs (3) between the upper and lower large-section pile bodies ); the lower pile body (5) is a circular frustum, the cross-section gradually decreases from top to bottom, the outer surface of the pile body is provided with a flange (6), and the angle between the lower end surface of the flange (6) and the pile body is 30°.

As shown in Figure 2, there are four symmetrically distributed wedge-shaped wings (2) around the large-section pile body of the upper pile body (1). The cross-section of the wedge-shaped wings (2) is trapezoidal. Grout holes (4), four symmetrically distributed curved ribs (3) are arranged between the upper and lower large-section piles.

When piles are formed, the prefabricated composite piles as mentioned above are prefabricated in the factory according to the pile length and pile diameter required on site, and all parts of the prefabricated composite piles should be welded or integrally formed to make them have sufficient strength.

During construction, use a pile driver to slowly drive the prefabricated composite pile into the design elevation of the foundation, and control the verticality of the pile body during the driving process to not exceed 0.5%; after the prefabricated composite pile is driven into the foundation design elevation, remove the pile driver , connect the high-pressure grouting equipment to the hollow part of the pile top for grouting operation, so that the grout enters the pile body, the grout fills the pile body, seeps out from the grouting hole to the soft soil layer around the pile, and fills up the upper pile After hardening, the gap between the pile body and the surrounding soil layer is combined with the upper pile body and the wedge-shaped wing plate to complete the construction.

Claims (1)

1. a kind of novel Prefabricated composite stake, which is characterized in that it by top pile body, wedge-shaped wing plate, arc floor, injected hole, under Portion's pile body, the edge of a wing and pile top composition；The top pile body is hollow variable cross-section pile body, and big section pile body periphery is equipped with 4 The wedge-shaped wing plate being symmetric, wedge-shaped wing plate cross section are trapezoidal, and small bore pile body is equipped with injected hole, up and down big section pile body Between be equipped with 4 arc floors being symmetric；The lower part pile body is round estrade, and cross section gradually subtracts from top to bottom Small, pile body outer surface is equipped with the edge of a wing, and edge of a wing lower face and pile body angle are 30 °.