Prestressed concrete special-shaped precast pile

Abstract

The utility model provides a prestressed concrete special-shaped precast pile. The prestressed concrete special-shaped precast pile comprises a pile body, an upper end plate and a lower end plate, the pile body is provided with at least one square pile section, at least two round pile sections and an expanded end section; the square pile sections and the circular pile sections are alternately arranged; the expanded end section is located on the lowermost layer. The prestressed concrete special-shaped precast pile is stable in structure, reasonable in design, large in contact area between the pile body and a soil layer, large in pile side friction resistance and capable of effectively improving bearing capacity and pulling resistance.

Description

Technical Field

[0001] The utility model belongs to the technical field of special-shaped piles, in particular to a prestressed concrete special-shaped prefabricated pile. Background Art

[0002] The shape of traditional concrete piles is generally a straight square pile or a round pipe pile. Although the straight prestressed concrete pile has good crack resistance and seismic resistance, the friction between the pile body and the soil is small, and the pull-out resistance and bearing capacity of the pile body are both small. At present, in the development of soft soil areas, due to poor foundation conditions and soft soil, it is necessary to increase the bearing capacity by increasing the length, diameter, and number of piles, which will increase the cost of the entire pile foundation project. In recent years, special-shaped piles have been gradually applied in the engineering development of soft soil areas, such as special-shaped pipe piles, special-shaped square piles, hexagonal piles, octagonal piles, T-shaped piles, etc. Special-shaped piles can significantly improve the bearing capacity of the pile body by changing the longitudinal cross-sectional shape of the pile body and increasing the unevenness and roughness of the pile-soil interface. Therefore, in order to meet the requirements of different foundation conditions, designing special-shaped piles with different structures has become a hot spot in the research and development of pile structures. Utility Model Content

[0003] In view of this, in order to solve the above technical problems, the utility model proposes a prestressed concrete special-shaped precast pile with reasonable structural design, large contact area between the pile and the soil layer, large friction resistance on the pile side, high bearing capacity, strong pull-out resistance and good stability.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A prestressed concrete special-shaped precast pile comprises a pile body, an upper end plate and a lower end plate arranged at the upper and lower ends of the pile body; the pile body has at least one square pile segment, at least two round pile segments, and an expanded head segment; the square pile segments and the round pile segments are arranged alternately; the expanded head segment is located at the bottom layer.

[0006] The pile body adopts the method of alternating square pile segments and round pile segments as the main body, with the expanded head segment as the lowest layer, to achieve changes in the cross-sectional shape and size of different segments. The surface of the pile body forms a concave-convex shape, which increases the contact area between the pile body and the soil layer, reduces the compressive stress of the soft soil, and better combines with the soft soil layer, increasing the friction resistance on the pile side, and improving the bearing capacity and pull-out resistance. In addition, the method of alternating square pile segments and round pile segments not only plays a bearing role but also has a retaining role. The expanded head segment increases the end resistance, and the structure is more stable.

[0007] Furthermore, the cross-section of the round pile segment is a circular ring, the cross-section of the square pile segment is a square with a circular through hole, and the cross-section of the expanded head segment is a circular ring; the round pile segment, the square pile segment, and the expanded head segment are coaxially arranged; the outer diameter of the circular ring of the round pile segment is the same as the side length of the square of the square pile segment, and the outer diameter of the circular ring of the expanded head segment is the same as the diagonal length of the square of the square pile segment.

[0008] Furthermore, at least one stabilizing member is provided on the outer wall of the circular pile segment; the stabilizing member includes a reinforcement ring fixed on the outer wall of the circular pile segment, and reinforcement plates circumferentially and evenly distributed along the outer wall of the reinforcement ring; the vertical cross-section of the reinforcement plate is a rhombus, one of the diagonals of which is in the same direction as the axial direction of the circular pile segment.

[0009] The provision of the stabilizing member can improve the bonding degree and friction resistance between the circular pile segment and the soil layer, and improve the pull-out resistance. At the same time, the reinforcing ring can constrain the circular pile segment in the horizontal direction, and improve the stability.

[0010] Furthermore, the diamond-shaped vertical cross-section of the reinforcing plate gradually becomes smaller in a direction away from the reinforcing ring.

[0011] Furthermore, a plurality of ridges extending in the axial direction are provided on the outer side wall of the square pile segment, which increases the specific surface area and surface roughness of the square pile segment, improves the friction resistance of the pile side of the square pile segment, and thus improves the pull-out bearing capacity of the pile.

[0012] Furthermore, annular bamboo nodes are evenly distributed along the axial direction on the outer side wall of the expanded head section. The expanded head section can increase the end resistance, and the provision of the annular bamboo nodes can increase the specific surface area, while playing a role in lateral reinforcement and stability.

[0013] Furthermore, the uppermost layer of the pile body is the round pile segment; the expanded head segment is connected to the round pile segment via a diameter reducing segment.

[0014] Compared with the prior art, the prestressed concrete special-shaped prefabricated piles described in the utility model have the following advantages:

[0015] (1) The prestressed concrete special-shaped prefabricated piles described in the utility model adopt the method of alternating the square pile segments and the round pile segments as the main body, and the expanded head segment is used as the bottom layer to form the pile body, so as to achieve the changes in the cross-sectional shape and size of different segments, and form a concave-convex shape on the surface of the pile body, thereby increasing the contact area between the pile body and the soil layer, reducing the compressive stress of the soft soil, and better combining with the soft soil layer, increasing the friction resistance on the pile side, and improving the bearing capacity and pull-out resistance;

[0016] (2) The alternating arrangement of square pile segments and round pile segments described in the utility model as the main body not only retains the advantages of the round pile segments, but also has the function of retaining soil due to the shape of the square pile segments, and has both the function of bearing and retaining soil. The end resistance is increased by the expanded head segment, and the structure is more stable;

[0017] (3) The circular pile segment described in the utility model is provided with a stabilizing member, which strengthens the pull-out resistance of the stabilizing member and also has the function of constraining the stabilizing member horizontally, thereby improving stability; the square pile segment is provided with a convex ridge, which increases the specific surface area and surface roughness of the square pile segment, thereby improving the friction resistance of the pile side of the square pile segment and the degree of integration with the soil layer; the expanded head segment is provided with an annular bamboo node, which increases the specific surface area of ​​the expanded head segment and improves the degree of integration with the soil layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the prestressed concrete special-shaped precast piles according to the embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the prestressed concrete special-shaped precast piles according to the embodiment of the utility model;

[0021] Figure 3 It is a top view of the prestressed concrete special-shaped precast pile described in an embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1-upper end plate, 2-lower end plate, 3-square pile section, 4-round pile section, 5-expanded head section, 6-diameter reducing section, 7-stabilizing member, 8-reinforcement ring, 9-reinforcement plate, 10-annular bamboo section. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0028] like Figures 1 to 3 As shown, a prestressed concrete special-shaped prefabricated pile comprises a pile body, an upper end plate 1 and a lower end plate 2 arranged at the upper and lower ends of the pile body; the pile body comprises at least one square pile segment 3, at least two round pile segments 4, and an expanded head segment 5; the square pile segments 3 and the round pile segments 4 are arranged alternately, the uppermost layer of the pile body is the round pile segment 4, the lowermost layer of the pile body is the expanded head segment 5, and the expanded head segment 5 is connected to the round pile segment 4 through a diameter reducing segment 6;

[0029] The cross section of the round pile segment 4 is a circular ring, the cross section of the square pile segment 3 is a square with a circular through hole, and the cross section of the expanded head segment 5 is a circular ring; the round pile segment 4, the square pile segment 3, and the expanded head segment 5 are coaxially arranged; the outer diameter of the circular ring of the round pile segment 4 is the same as the side length of the square of the square pile segment 3, and the outer diameter of the circular ring of the expanded head segment 5 is the same as the diagonal length of the square of the square pile segment 3;

[0030] At least one stabilizing member 7 is provided on the outer wall of the circular pile segment 4; the stabilizing member 7 comprises a reinforcing ring 8 fixed on the outer wall of the circular pile segment 4, and reinforcing plates 9 distributed at equal intervals along the circumferential direction of the outer wall of the reinforcing ring 8; the vertical cross section of the reinforcing plate 9 is a rhombus, one of the diagonals of which is in the same direction as the axial direction of the circular pile segment 4; the rhombus vertical cross section of the reinforcing plate 9 gradually becomes smaller in the direction away from the reinforcing ring 8;

[0031] The outer side wall of the square pile section 3 is provided with a plurality of ridges (not shown in the figure) extending in the axial direction;

[0032] Annular bamboo nodes 10 are distributed on the outer side wall of the expansion head section 5 at equal intervals along the axial direction.

[0033] The prestressed concrete special-shaped precast pile described in the utility model is a structure in which square pile sections 3 and round pile sections 4 are arranged alternately, and the lowest layer is a structure of an expanded head section 5. By utilizing the changes in the cross-sectional shapes and sizes of different sections and targeting the structural characteristics of different sections, the method of adding stabilizing members 7, convex edges, and annular bamboo sections 10 is further optimized, so that the surface of the pile body forms a concave-convex shape, the contact area between the pile body and the soil layer is increased, the compressive stress of soft soil is reduced, the degree of bonding with soft soil is optimized, the friction resistance on the pile side is increased, the bearing capacity and pull-out resistance are improved, and the stability of the pile is improved.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prestressed concrete special-shaped precast pile, comprising a pile body, an upper end plate and a lower end plate arranged at the upper and lower ends of the pile body, characterized in that: The pile body comprises at least one square pile segment, at least two round pile segments and one expanded head segment; the square pile segments and the round pile segments are arranged alternately; and the expanded head segment is located at the bottom layer.

2. The prestressed concrete special-shaped precast pile according to claim 1, characterized in that: The cross-section of the round pile segment is a circular ring, the cross-section of the square pile segment is a square with a circular through hole, and the cross-section of the expanded head segment is a circular ring; the round pile segment, the square pile segment, and the expanded head segment are coaxially arranged; the outer diameter of the circular ring of the round pile segment is the same as the side length of the square of the square pile segment, and the outer diameter of the circular ring of the expanded head segment is the same as the diagonal length of the square of the square pile segment.

3. The prestressed concrete special-shaped precast pile according to claim 1, characterized in that: At least one stabilizing member is provided on the outer wall of the circular pile segment; the stabilizing member includes a reinforcement ring fixed on the outer wall of the circular pile segment and reinforcement plates circumferentially and evenly distributed along the outer wall of the reinforcement ring; the vertical cross-section of the reinforcement plate is a rhombus, one of the diagonals of which is in the same direction as the axial direction of the circular pile segment.

4. The prestressed concrete special-shaped precast pile according to claim 3, characterized in that: The rhombus-shaped vertical cross section of the reinforcing plate gradually becomes smaller in a direction away from the reinforcing ring.

5. The prestressed concrete special-shaped precast pile according to claim 1, characterized in that: A plurality of ridges extending in the axial direction are arranged on the outer side wall of the square pile section.

6. The prestressed concrete special-shaped precast pile according to claim 1, characterized in that: Annular bamboo nodes are evenly distributed along the axial direction on the outer side wall of the expansion head section.

7. The prestressed concrete special-shaped precast pile according to any one of claims 1 to 6, characterized in that: The uppermost layer of the pile body is the round pile section; the expanded head section is connected to the round pile section via a diameter reducing section.

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