CN202000345U

CN202000345U - Prestressed concrete hollow square pile

Info

Publication number: CN202000345U
Application number: CN 201120114898
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: 2011-04-19
Filing date: 2011-04-19
Publication date: 2011-10-05
Anticipated expiration: 2021-04-19

Abstract

The utility model discloses a prestressed concrete hollow square pile, which comprises a reinforcing cage and concrete, wherein the reinforcing cage comprises a framework main reinforcement and a hoop reinforcement, wherein the hoop reinforcement is spirally welded on the framework main reinforcement continuously; the two ends of the prestressed concrete hollow square pile are provided with metal end plates which are connected with the reinforcing cage; the metal end plates are square; the corners of the four sides of each metal end plate have stress eliminating circular arc structures; the circular arc radiuses R3 of a pair of adjacent circular arc angles of each metal end plate are between 30 millimeters and 40 millimeters, and the circular arc radiuses R4 of another pair of circular arc angles are between 10 millimeters and 20 millimeters; and the four sides of each metal end plate are provided with welding slopes with the inclination angles of 45 degrees. The prestressed concrete hollow square pile provided by the utility model has the advantages of material saving, light dead weight, difficulty in damaging during building construction hammering, high pile body ductility and high bending and shearing resistance.

Description

Prestressed concrete hollow square pile

Technical Field

The utility model relates to a hollow square pile of prestressed concrete.

Background

The pile materials used as foundation pile engineering are in the market, such as tubular piles, various square piles, cast-in-place piles, drilled piles and the like. These piles are mainly classified into non-prestressed members and prestressed members. The prestressed component pile material comprises a tubular pile, a centrifugal prestressed square pile and the like. They have the disadvantages of often greater brittleness, shorter time from cracking to destruction, poorer ductility of the pile body, and instant collapse of the building caused by earthquake, so that personnel in the building can not escape in sufficient time. This problem is particularly acute in areas of high earthquakes.

Non-prestressed member piles include conventional square piles, cast-in-place piles, and the like. The construction method has the advantages that the bearing capacity of a single pile is relatively low, the bending (pulling) and shearing resistance performance is poor, the construction period is long, and the pile-forming quality does not meet the design requirement; the pile material is seriously damaged in the transportation and use processes, so that the durability of the pile body concrete is poor. The precast pile has smooth appearance, small friction between pile material and soil layer, unreasonable main reinforcement layout, prestressed reinforcement or common reinforcement as main reinforcement, and poor bending resistance of pile body. The four sides of the end plate are not provided with welding grooves, so that the connection firmness of the pile is influenced. The pile body cross-section is the quadrangle, and pile body four corners is very easily damaged in the construction, causes whole stake to scrap, not only causes the waste, but also can influence the construction progress.

SUMMERY OF THE UTILITY MODEL

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

In order to solve the problems, the utility model provides a prestressed concrete hollow square pile, which comprises a reinforcement cage and concrete; the reinforcement cage comprises a framework main reinforcement and a stirrup, and the stirrup is spirally and continuously welded on the framework main reinforcement; two ends of the prestressed concrete hollow square pile are provided with metal end plates connected with the reinforcement cage, the metal end plates are square in shape, and corners on four sides of the metal end plates are in a stress relief arc shape; the arc radius R3 of one pair of adjacent arc angles of the metal end plate is 30-40mm, and the arc radius R4 of the other pair of adjacent arc angles of the metal end plate is 10-20 mm; four sides of the metal end plate are provided with welding grooves with 45-degree inclination angles.

Preferably, the shape of the metal end plate is the same as the shape of the pile body of the prestressed concrete hollow square pile.

Preferably, the pile core of the prestressed concrete hollow square pile is a cylindrical middle hole, the center of the metal end plate is a circular hole with the same diameter as the middle hole, and threading holes and tension holes are symmetrically formed between the circular hole and four sides of the metal end plate.

Preferably, the skeleton main reinforcement is a steel bar, and a heading is arranged at the joint of the steel bar and the metal end plate.

Preferably, a hoop is arranged at the pile body connecting part of the metal end plate and the prestressed concrete hollow square pile.

Preferably, the main frame steel bar is a prestressed steel bar.

The utility model provides a hollow square pile of prestressed concrete owing to adopted hollow shape, consequently economizes material, dead weight are light, and pile body four sides corner is stress relief arc, and the pile head is connected with the cuff for the stake material is not fragile when the construction hammering, has improved the product and has become the stake rate.

The utility model provides a hollow square pile of prestressed concrete, main muscle is rationally distributed, the stirrup is the heliciform welding on the main muscle, so pile body ductility is good, it is big to become the stake bearing capacity, and bending resistance shear behavior is good.

The utility model provides a hollow square pile of prestressed concrete, end plate have the welding groove and have also strengthened the fastness of becoming the stake and connecting.

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 structural view of a prestressed concrete hollow square pile according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an end plate and a hoop of a prestressed concrete hollow square pile according to an embodiment of the present invention;

fig. 3 is a top view of a prestressed concrete hollow square pile according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of the prestressed concrete hollow square pile shown in FIG. 1;

FIG. 5 is a schematic cross-sectional view taken along line A-A of the prestressed concrete hollow square pile shown in FIG. 3;

fig. 6 is an enlarged view of the portion C of the prestressed concrete hollow square pile shown in fig. 3.

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 prestressed concrete hollow square pile according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic view of an external structure of a prestressed concrete hollow square pile according to an embodiment of the present invention; fig. 4 is a schematic cross-sectional view of the prestressed concrete hollow square pile shown in fig. 1. For clarity, a three-axis vertical coordinate system is used as a reference in the drawing, wherein the direction along the coordinate axis z is the axial direction of the prestressed concrete hollow square pile, the direction along the coordinate axis x is the transverse direction of the section of the prestressed concrete hollow square pile, and the direction along the coordinate axis y is the longitudinal direction of the section of the prestressed concrete hollow square pile.

Specifically, referring to fig. 1 and 4, the prestressed concrete hollow square pile comprises a reinforcement cage 1 and concrete 2. The reinforcement cage 1 comprises a framework main reinforcement 11 and stirrups 12, and the stirrups 12 of the reinforcement cage are spirally and continuously welded on the framework main reinforcement 11; the prestressed concrete hollow square pile is square in shape, the pile core is a cylindrical middle hole, and corners on four sides of the prestressed concrete hollow square pile are in a stress relief arc shape, wherein the arc radius R1 of a pair of adjacent arc angles of the prestressed concrete hollow square pile is 30-40mm, and the arc angle is 90 degrees; the arc radius R2 of the other pair of arc angles is 10-20mm, and the arc angles are also 90 degrees. The corners of four sides of the pile body are arc-shaped for eliminating stress, so that the pile material is not easy to damage when being hammered in building construction. In another embodiment, the main frame rib 11 is parallel to the pile body contour line. In another embodiment, the main frame steel 11 is prestressed steel.

Fig. 2 is a schematic structural view of an end plate and a ferrule of a prestressed concrete hollow square pile according to an embodiment of the present invention, and fig. 3 is a plan view of the prestressed concrete hollow square pile according to an embodiment of the present invention; FIG. 5 is a schematic cross-sectional view taken along line A-A of the prestressed concrete hollow square pile shown in FIG. 3; fig. 6 is an enlarged view of the portion C of the prestressed concrete hollow square pile shown in fig. 3.

Referring to fig. 2, 3, 5 and 6, the two ends of the prestressed concrete hollow square pile are provided with metal end plates 3 connected with the reinforcement cage 1, the shape of the metal end plates 3 is the same as that of the pile body, and four sides of the two end plates are provided with welding grooves 32 with 45-degree inclination angles, so that the firmness of pile forming connection is enhanced.

That is, the shape of the metal end plate 3 is the same as that of the pile body, the shape is also square, and the corners of the metal end plate are stress-relief circular arcs, wherein the circular arc radius R3 of a pair of adjacent circular arc angles is 30-40mm, and the circular arc angle is 90 degrees; the arc radius R4 of the other pair of arc angles is 10-20mm, and the arc angles are also 90 degrees.

In another embodiment, the center of the metal end plate 3 is a circular hole with the same diameter as the hole in the pile core, a threading hole 311 and tension holes 313 are symmetrically arranged between the circular hole and four sides, and each tension hole 313 is connected with the threading hole 311 through a rib groove 312.

In another embodiment, the main frame rib 11 is a steel rod, and the joint of the steel rod and the metal end plate 3 is provided with a heading, so that the connection between the steel rod and the end plate 3 can be more stable.

In another embodiment, the threading holes 311 and the tension holes 313 on the metal end plate 3 are arranged in a generally square shape, and the threading holes 311 are countersunk holes, so that damage to the upset heads of the framework main bars 11 during hammering in construction can be avoided.

In another embodiment, the ferrule 4 is arranged at the connection part of the metal end plate 3 and the pile body, so that the strength of the pile head can be further enhanced, and the pile head is prevented from being damaged when hammering in construction.

The utility model provides a hollow square pile of prestressed concrete, main muscle is rationally distributed, the stirrup is the heliciform welding on the main muscle, so pile body ductility is good, it is big to become the stake bearing capacity, and bending resistance shear behavior is good. The utility model provides a hollow square pile of prestressed concrete, end plate have the welding groove and have also strengthened the fastness of becoming the stake and connecting.

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 prestressed concrete hollow square pile comprises a reinforcement cage (1) and concrete (2); the reinforcement cage (1) is characterized by comprising a framework main reinforcement (11) and stirrups (12), wherein the stirrups (12) are spirally and continuously welded on the framework main reinforcement (11); two ends of the prestressed concrete hollow square pile are provided with metal end plates (3) connected with the reinforcement cage (1), the metal end plates (3) are square in shape, and corners on four sides of the metal end plates are in a stress relief arc shape; the arc radius R3 of one pair of adjacent arc angles of the metal end plate (3) is 30-40mm, and the arc radius R4 of the other pair of adjacent arc angles is 10-20 mm; four sides of the metal end plate (3) are provided with welding grooves (32) with 45-degree inclination angles.

2. The prestressed concrete hollow square pile according to claim 1, wherein the outer shape of the metal end plate (3) is the same as the outer shape of the pile body of the prestressed concrete hollow square pile.

3. The prestressed concrete hollow square pile according to claim 2, wherein the core of the prestressed concrete hollow square pile is a cylindrical central hole, the center of the metal end plate (3) is a circular hole having the same diameter as the central hole, and a threading hole (311) and a tension hole (313) are symmetrically formed between the circular hole and four sides of the metal end plate (3).

4. The prestressed concrete hollow square pile according to claim 3, wherein said main frame reinforcement (11) is a steel bar, and the joint of said steel bar and said metal end plate (3) is provided with an upset head.

5. The prestressed concrete hollow square pile according to claim 4, wherein the metal end plate (3) is provided with a collar (4) with the pile body connecting portion of the prestressed concrete hollow square pile.

6. The prestressed concrete hollow square pile according to claim 5, wherein said main frame reinforcement (11) is a prestressed reinforcement.