CN202039343U

CN202039343U - Hollow foundation concrete square pile

Info

Publication number: CN202039343U
Application number: CN 201120141525
Authority: CN
Inventors: 张强; 朱建舟
Original assignee: Shanghai Zhongji Pile Industry Co Ltd
Current assignee: Bao Lei
Priority date: 2011-05-06
Filing date: 2011-05-06
Publication date: 2011-11-16
Anticipated expiration: 2021-05-06

Abstract

A hollow foundation concrete square pile comprises a pile body, wherein the cross section of the pile body is in the rectangle shape, and the pile body is provided with at least one reinforcement cage and concrete. Two ends of the reinforcement cage are respectively connected with a rectangular metal end plate, the shape of the metal end plate is identical with the shape of the pile body, the reinforcement cage includes at least four main bars and hoopings, and the hoopings are welded on the main bars in spiral mode. The four main bars are respectively connected with four corresponding tension holes on the metal end plate, the four tension holes are symmetrically distributed on two diagonal lines of the metal end plate, four corners of the metal end plate are provided with identical stress relief arc corners, and the four tension holes are respectively positioned in the centers of the four stress relief arc corners. The hollow foundation concrete square pile can achieve larger soil layer fraction and greater bearing capacity.

Description

Hollow foundation concrete square pile

Technical Field

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

Background

Piles made of concrete (including ordinary reinforced concrete, prestressed concrete). The composite material has the advantages of wood and steel saving, durability, low manufacturing cost and the like, is widely used in foundation engineering of hydraulic buildings, industrial buildings, civil buildings and bridges, and is also commonly used for anti-sliding or water-resisting of side slopes and foundation pit supporting. The concrete pile is divided into two types, namely a common reinforced concrete pile and a prestressed concrete pile, and the construction process of the concrete pile has two types: the pile comprises a soil-squeezing pile, a non-soil-squeezing pile, a soil-squeezing cast-in-place pile with a sinking pipe (cast-in-place, a pipe sinking method comprises static pressure, vibration, hammering and the like), and a precast pile (common reinforced concrete and prestressed concrete); non-extruded soil is generally cast-in-place, and is provided with manual hole digging piles, punching (drilling) hole filling piles and the like.

At present, in China, a lot of concrete piles are used as pipe piles, for example, a Chinese patent 'temporary prestressed concrete pipe pile' with publication number of CN 1246568A, which provides a temporary prestressed concrete pipe pile, which consists of a pipe pile body, prestressed reinforcement, a pile tip and a pile top cover plate; its characterized in that tubular pile body is hollow, and the prestressing steel passes pile body hollow part, utilizes pile bolck apron and pile tip or pile bottom steel sheet to do the prestressing anchor utensil, applys prestressing force to the pile body, and prestressing force is temporary: the pile is connected in sections on the construction site and driven into the soil, after one pile is driven, the prestress of the pile is released, the prestress steel bars and the pile top cover plate are taken out, and the prestress steel bars and the pile top cover plate can be repeatedly used.

The pipe pile provided by the patent is smooth and round in appearance, so that when the pipe pile is used as a friction pile, the friction force with a soil layer is small, and the bearing capacity is small.

SUMMERY OF THE UTILITY MODEL

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

In order to solve the problems, the utility model provides a hollow foundation concrete square pile, which comprises a pile body with a rectangular cross section, wherein the pile body is at least provided with a reinforcement cage and concrete, two ends of the reinforcement cage are respectively connected with a rectangular metal end plate, the metal end plates have the same shape as the pile body, the reinforcement cage at least comprises four main reinforcements and stirrups, and the stirrups are spirally welded on the main reinforcements; the four main ribs are respectively connected to four corresponding tension holes in the metal end plate, the four tension holes are symmetrically distributed on two diagonal lines of the metal end plate, four corners of the metal end plate are provided with stress relief arc angles with the same size, and the four tension holes are respectively located at the circle centers of the four stress relief arc angles.

Preferably, the center of the hollow foundation concrete square pile is an axial hollow through hole with a circular section.

Preferably, the arc radius of the stress relief arc angle is 10-80 mm.

Preferably, the prestressed main reinforcement extends axially along the hollow foundation concrete square pile body.

Preferably, the vertical distance between the tension hole and the edge of the metal end plate closest to the tension hole is greater than or equal to 25 mm.

Preferably, the radius of the stress relief arc angle is the same as the perpendicular distance of the tension hole from the edge of the metal end plate closest thereto.

The utility model provides a hollow foundation concrete 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, and this just means that this hollow foundation concrete square pile can obtain bigger soil layer friction than relative tubular pile under equal geological conditions, promptly, this hollow foundation concrete square pile can obtain bigger bearing capacity than relative tubular pile under equal geological conditions.

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-section view of a hollow foundation concrete square pile according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the hollow foundation concrete square pile shown in fig. 1;

fig. 3 is a top view of the hollow foundation concrete 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 structure and the principle of a hollow foundation concrete square pile according to the present invention will be described in detail with reference to the following.

Fig. 1 is a schematic half-sectional view of a hollow foundation concrete square pile according to an embodiment of the present invention, fig. 2 is a schematic structural view of the hollow foundation concrete square pile shown in fig. 1, and fig. 3 is a top view of the hollow foundation concrete square pile shown in fig. 2. Referring to fig. 1-3, according to the utility model discloses a hollow foundation concrete square pile, including the pile body that the cross section is the rectangle, the pile body has a steel reinforcement cage 1 and concrete 2 at least, the concrete 2 pouring is in behind the steel reinforcement cage 1, through technologies such as centrifugation, vibrations, produce hollow foundation concrete square pile. The two ends of the reinforcement cage 1 are respectively connected with a rectangular metal end plate 3, the shape of the metal end plate 3 is the same as that of the pile body, and the metal end plate 3 enables the hollow foundation concrete square pile to have better impact resistance, so that the pile head breakage rate of the hollow foundation concrete square pile is effectively reduced; 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 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 rectangular 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.

As can also be seen in the figure, the reinforcement cage 1 at least comprises four main reinforcements 11 and stirrups 12, and the stirrups 12 are spirally welded on the main reinforcements 11; therefore, the mechanical automatic welding is facilitated, and meanwhile the spiral stirrups 12 can enable the reinforcement cage 1 to have good expansion resistance and torsion resistance. Four main muscle 11 connect respectively in four corresponding tension hole 31 on the metal end plate 3, four tension hole 31 symmetric distribution are in on two diagonals of metal end plate 3, four angles of metal end plate 3 have the stress relief arc angle that the size is the same, four tension hole 31 are located respectively the centre of a circle of four stress relief arc angles.

In a particular embodiment, there is a central through hole through the entire hollow foundation concrete square pile in the center of the hollow foundation concrete square pile in the direction of the longitudinal axis of the hollow foundation concrete square pile. Therefore, the dead weight of the hollow foundation concrete square pile body can be effectively reduced. The cross section of the hollow foundation concrete square pile is square, so that the friction force between the hollow foundation concrete square pile and a soil layer can be effectively increased, and the hollow foundation concrete square pile has higher bearing capacity; the cross section of the central through hole of the hollow foundation concrete square pile is circular; the central through hole is thus easy to form in production.

In another embodiment, the prestressed main reinforcement 11 extends axially along the hollow foundation concrete square pile body.

In a specific embodiment, the vertical distance L between the tension hole 31 and the nearest edge of the metal end plate 3 is greater than or equal to 25mm, and the main reinforcement 11 extends axially along the pile body, so that the thickness of the concrete 2 outside the reinforcement cage 1 of the hollow foundation concrete square pile can be effectively ensured, the corrosion of atmosphere or corrosive media to the reinforcement is reduced, the service life of the component is prolonged, and the good durability of the hollow foundation concrete square pile is ensured.

In a specific embodiment, four corners of the metal end plate 3 have stress relief arc corners with the same size, so that the hollow foundation concrete square pile is attractive in appearance, and safety accidents caused by that steel wires are broken off and fall off in the hoisting process of the hollow foundation concrete square pile due to undersize of the corners of the pile body of the hollow foundation concrete square pile are avoided.

In a specific embodiment, the arc radius R of the stress relief arc angle is 6-80 mm.

In another embodiment, the radius R of the stress relief arc angle is the same as the perpendicular distance L of the tension hole 31 from the edge of the metal end plate 3 closest thereto.

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 foundation concrete square pile comprises a pile body with a rectangular cross section, wherein the pile body is at least provided with a reinforcement cage and concrete, and two ends of the reinforcement cage are respectively connected with a rectangular metal end plate; the four main ribs are respectively connected to four corresponding tension holes in the metal end plate, the four tension holes are symmetrically distributed on two diagonal lines of the metal end plate, four corners of the metal end plate are provided with stress relief arc angles with the same size, and the four tension holes are respectively located at the circle centers of the four stress relief arc angles.

2. The hollow foundation concrete square pile of claim 1, wherein the hollow foundation concrete square pile has an axial hollow through hole in the center thereof, which is circular in cross section.

3. The hollow foundation concrete square pile of claim 2, wherein the stress relief arc angle has an arc radius of 6-80 mm.

4. The hollow foundation concrete square pile of claim 3, wherein the prestressed main reinforcement extends axially along the hollow foundation concrete square pile body.

5. The hollow foundation concrete square pile of claim 4, wherein the vertical distance of the tension hole from the edge of the metal end plate nearest thereto is 25mm or more.

6. The hollow foundation concrete square pile of claim 5, wherein the radius of the stress relief arc angle is the same as the vertical distance of the tension hole from the edge of the metal end plate nearest thereto.