CN202039345U

CN202039345U - Hollow square concrete foundation pile

Info

Publication number: CN202039345U
Application number: CN 201120141545
Authority: CN
Inventors: 张强; 朱建舟
Original assignee: Shanghai Zhongji Pile Industry Co Ltd
Current assignee: Shanghai Zhongji Pile Industry Co Ltd
Priority date: 2011-05-06
Filing date: 2011-05-06
Publication date: 2011-11-16
Anticipated expiration: 2021-05-06

Abstract

The utility model provides a hollow square concrete foundation pile, which comprises a pile body with a square cross section, the pile body is provided with at least one reinforcement cage and concrete, the reinforcement cage comprises main reinforcements and a stirrup, the stirrup is spirally welded on the main reinforcements, the center of the pile body is a central through hole, the section of which is round, the length of the side of the square section of the pile body is 1.6 to 3.8 times as large as the diameter of the central through hole, the vertical distance between the stirrup and the outer surface of the pile body is larger than or equal to 35mm, and the vertical distance between the stirrup and the surface of the central through hole is larger than or equal to 30mm. The hollow square concrete foundation pile provided by the utility model can obtain higher frictional force on soil, and thereby having higher bearing capacity.

Description

Hollow concrete foundation square pile

Technical Field

The utility model relates to a foundation pile material, especially a hollow concrete foundation square pile in the construction field foundation pile engineering.

Background

With the high-speed development of the building industry, the design and construction requirements of the building engineering on the foundation are higher and higher, so that the concrete pile is more and more widely applied to the engineering of high-rise buildings, bridges, ports, offshore buildings and the like. In order to make the pile foundation meet the requirements of anti-deformation and anti-seismic building design, the bearing capacity of the cast-in-place concrete pile is usually improved by lengthening the pile body and increasing the diameter of the pile body. However, lengthening or enlarging the pile body inevitably leads to an increase in the amount of concrete used for the concrete cast-in-place pile, thereby resulting in an increase in cost.

Although the existing prestressed pipe pile can have higher bearing capacity than a concrete cast-in-place pile, and is suitable for the requirements of most construction environments, the defects of the existing prestressed pipe pile are obvious: the surface is smooth and round, when the friction pile is used as a friction pile, the friction force with a soil layer is small, so that a pipe pile with a large outer diameter or a solid square pile has to be used in many projects, and the project cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a hollow concrete foundation square pile to reduce or avoid the aforementioned problem.

In order to solve the problems, the utility model provides a hollow concrete foundation square pile, which comprises a pile body with a square cross section, wherein the pile body is at least provided with a reinforcement cage and concrete, the reinforcement cage comprises a main reinforcement and a stirrup, and the stirrup is welded on the main reinforcement in a spiral shape; the central part of the pile body is a central through hole with a circular section, the side length of a square of the section of the pile body is 1.6-3.8 times of the diameter of the central through hole, the vertical distance between the stirrup and the outer surface of the pile body is more than or equal to 35mm, and the vertical distance between the stirrup and the surface of the central through hole is more than or equal to 30 mm.

Preferably, the two ends of the pile body are provided with end plates connected with the main ribs, and the main ribs are fixedly connected with the end plates.

Preferably, the stirrup is fixedly connected with the end plate.

Preferably, four corners of the cross section of the pile body have equal stress relief arc angles, four corners of the end plate also have equal stress relief arc angles, the arc radius of the stress relief arc angle of the end plate is equal to the arc radius of the stress relief arc angle of the pile body, and the arc radius is 10-40 mm.

The utility model provides a hollow concrete foundation square pile, because external surface area is big and squarely, so its pile body is much greater than the circular outward appearance of tubular pile with the angle of repose of soil in the soil layer, this just means that this hollow concrete foundation square pile can obtain bigger soil layer friction than relative tubular pile under equal geological conditions, also promptly, this hollow concrete foundation square pile can obtain bigger bearing capacity than relative tubular pile under equal geological conditions, thereby satisfy the building requirement, reduce engineering cost.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein,

fig. 1 is a schematic half-sectional view of a hollow concrete foundation square pile according to an embodiment of the present invention;

fig. 2 is a top view of a hollow concrete foundation square pile according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of the hollow concrete foundation square pile shown in fig. 1.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.

The following describes in detail a hollow concrete foundation square pile and its principle according to the present invention, taking a hollow concrete foundation square pile as an example.

Fig. 1 is a schematic half-sectional view of a hollow concrete foundation square pile according to an embodiment of the present invention; fig. 2 is a top view of a hollow concrete foundation square pile according to an embodiment of the present invention; fig. 3 is a schematic cross-sectional view of the hollow concrete foundation square pile shown in fig. 1. Specifically, as shown in fig. 1 and 3, the hollow concrete foundation square pile comprises a pile body with a square cross section, wherein the pile body at least comprises a reinforcement cage 1 and concrete 2, and the hollow concrete foundation square pile is produced by the processes of centrifugation, vibration and the like after the concrete 2 is poured into the reinforcement cage 1.

Reinforcement cage 1 includes main muscle 11 and stirrup 12, main muscle 11 distributes four corners of reinforcement cage 1, stirrup 12 is the heliciform welding on main muscle 11, the mechanized automatic weld of being convenient for like this, and heliciform stirrup 12 can make simultaneously reinforcement cage 1 possesses good anti flexible, antitorque performance.

The central authorities of pile body are central through-hole that the cross-section is circular shape, the pile body both ends be equipped with end plate 3 that main muscle 11 is connected, main muscle 11 with end plate 3 is fixed connection.

In a specific embodiment, the hollow concrete foundation square pile is provided with a square head part by using concrete, and the head part is connected with the hard end plate 3, so that the hollow concrete foundation square pile has better impact resistance and a much smaller pile head breakage rate than a tubular pile. Meanwhile, the square shape has larger welding perimeter than the circular shape, so that the effective welding strength between each section of pile is fully ensured, the phenomenon of joint desoldering or displacement of the hollow concrete foundation square pile in construction is greatly reduced, and the pile forming quality is better. In addition, the non-welded quick connector is easier to develop in the square shape, all-weather construction can be really achieved, construction is quicker, and the phenomenon that a welded pile head cracks in a high underground water level can be avoided.

In another specific embodiment, the side length L of the square of the cross section of the pile body is 1.6-3.8 times of the diameter D of the central through hole, so that the thickness of a concrete layer can be effectively reduced while the structural strength of the hollow concrete foundation square pile is guaranteed, and the self weight of the hollow concrete foundation square pile is reduced.

In another embodiment, in order to ensure the structural strength of the hollow concrete foundation square pile, reduce the corrosion of atmosphere or corrosive media to reinforcing steel bars, prolong the service life of a component and ensure the good durability of the hollow concrete foundation square pile, the vertical distance La between the stirrup 12 and the outer surface of the pile body is greater than or equal to 35mm, and the vertical distance Lb between the stirrup 12 and the surface of the central through hole is greater than or equal to 30 mm.

In another embodiment, the main reinforcement 11 is welded to the end plate 3, thereby enhancing the impact resistance of the hollow concrete foundation square pile head.

It should be understood by those skilled in the art that although the main rib 11 is welded to the end plate 3 in the foregoing description, in practical applications, the main rib 11 may be fixed and stretched to be connected to a corresponding bayonet of the end plate 3. That is, the main rib 11 may also be fixedly connected to the end plate 3 by mechanical contact.

In an embodiment of the present invention, the stirrup 12 is fixedly connected to the end plate 3. This enables the reinforcement cage 1 to be better bonded to the end plate 3, which also increases the structural strength of the hollow concrete foundation square pile.

Fig. 2 is according to the utility model discloses a concrete embodiment's hollow concrete foundation square pile's top view, it is shown with reference to fig. 2, 3 according to the utility model discloses a concrete embodiment, four corners in pile body cross-section have the stress relief arc angle that size equals, four corners of end plate 3 also have the stress relief arc angle that size equals, the arc radius R of the stress relief arc angle of end plate 3 equals the arc radius of the stress relief arc angle of the pile body, this arc radius R is 10-40 mm. Therefore, the hollow concrete foundation square pile is attractive in appearance, and safety accidents caused by the fact that steel wires are broken by abrasion in the hoisting process of the pile body due to the fact that the corners of the pile body of the hollow concrete foundation square pile are too small are avoided.

Referring to fig. 3, in this embodiment according to the present invention, the distance Lc from the outermost side of the arc at the corner of the hollow concrete foundation square pile to the outside of the main rib at the corner of the steel reinforcement cage 1 is equal to the distance Ld from the periphery of the hollow concrete foundation square pile to the outside of the main rib at the side of the steel reinforcement cage 1. Like this, steel reinforcement cage 1 is in hollow concrete foundation square pile body concrete layer's central point puts, can make hollow concrete foundation square pile possesses good structural performance, can effectively guarantee this hollow concrete foundation square pile simultaneously the concrete thickness of steel reinforcement cage 1 both sides to reduce the erosion of atmosphere or aggressive medium to the reinforcing bar, the life of extension component ensures this hollow concrete foundation square pile's good durability.

It is to be understood by those skilled in the art that while the present invention has been described in terms of several embodiments, it is not intended that each embodiment cover a separate embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including all technical equivalents which are encompassed by the claims.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims

1. A hollow concrete foundation square pile comprises a pile body with a square cross section, wherein the pile body is at least provided with a reinforcement cage and concrete, the reinforcement cage comprises a main reinforcement and a stirrup, and the stirrup is welded on the main reinforcement in a spiral shape; the pile is characterized in that the center of the pile body is a central through hole with a circular section, the side length of a square of the section of the pile body is 1.6-3.8 times of the diameter of the central through hole, the vertical distance between the stirrup and the outer surface of the pile body is more than or equal to 35mm, and the vertical distance between the stirrup and the surface of the central through hole is more than or equal to 30 mm.

2. The hollow concrete foundation square pile of claim 1, wherein end plates connected with the main ribs are arranged at two ends of the pile body, and the main ribs are fixedly connected with the end plates.

3. The hollow concrete foundation square pile of claim 2, wherein the stirrup is fixedly connected to the end plate.

4. The hollow concrete foundation square pile of claim 3, wherein four corners of the pile body cross section have equal stress relief fillets, and four corners of the end plate have equal stress relief fillets, the stress relief fillets of the end plate having a radius of curvature equal to the radius of curvature of the stress relief fillets of the pile body, the radius of curvature being 10-40 mm.