CN202023186U

CN202023186U - Concrete square pile

Info

Publication number: CN202023186U
Application number: CN 201120114818
Authority: CN
Inventors: 张强; 朱建舟
Original assignee: Shanghai Zhongji Pile Industry Co Ltd
Current assignee: Bao Lei
Priority date: 2011-04-19
Filing date: 2011-04-19
Publication date: 2011-11-02
Anticipated expiration: 2021-04-19

Abstract

The utility model relates to a concrete square pile, which comprises a steel reinforcement cage and concrete, wherein the steel reinforcement cage comprises framework main bars and hooping; the hooping is in spiral shape and continuously welded on the framework main bars; two ends of the concrete square pile are respectively provided with a metal end plate which is connected with the steel reinforcement cage; and the connecting part of the metal end plates and a pile body is respectively provided with a hoop. The concrete square pile saves material, is light in dead weight, is not easily damaged due to hammering in construction, has good ductility of a pile body, big bearing capacity of a finished pile, good anti-bending property and shearing resistance property and has good firm property during pile extension.

Description

Concrete square pile

Technical Field

The utility model relates to a concrete square pile.

Background

In the construction process of buildings, the construction and treatment of the foundation by using square piles is a mature foundation construction process at the present stage. The square piles used by the method are prefabricated reinforced concrete square piles and prestressed concrete square piles.

The prefabricated reinforced concrete square pile is a solid square pile, and is formed by directly filling concrete into prefabricated reinforcing steel bars and naturally curing. Due to the limitation of factors such as seismic compaction and construction process, the pile has the defects of low concrete strength, high material waste of steel and the like.

The prestressed concrete square pile is made up by filling concrete in the prefabricated reinforcing bar cage and making it pass through the processes of centrifugation and steam curing. This results in an effective cross-section of only 25-50% of the total cross-section, due to the conventional one-fill, one-centrifuge technique, and a large hollow location in the pile. Because the stressed cross-sectional area is small, the corresponding bearing capacity performance of the single pile structure is poor, the penetrating power to a hard stratum is not ideal enough in the pile pressing process, and the pile explosion condition caused by minimum construction deviation is common. Therefore, how to improve the single-pile bearing capacity of the prestressed concrete square pile and reduce the construction cost becomes a technical problem to be solved in the prior art.

In addition, in the manufacturing process of the hollow concrete square pile, the problems of low mechanization degree, lagged equipment and process and the like generally exist. If, with manual tie stirrup during preparation steel reinforcement cage, this not only influences work efficiency, and more serious is that the fastness of the stirrup itself of tying is not enough, has the room of sliding, can directly influence the concrete pile quality. As another example, the main reinforcement of the reinforcement cage is not tensioned or the reinforcement cages arranged in a row are tensioned together. For example, chinese patent application 99116046.0 discloses a prestressed square pile, in which "a plurality of pile cages are connected end to end, the panels and main reinforcement of the pile cages are connected by a draw hook and arranged in a straight line, the end of each row of pile cages is fixed to a fixed base, the head of each row of pile cages is pulled by a device to simultaneously stretch the rows of pile cages to generate prestress, the pile cages are tightly combined with concrete in a fixed form by vibration to form pile sections, and the pile sections are welded by the panels of the upper and lower pile sections to form the pile. "

The prior art described above is the tensioning of reinforcement cages arranged in rows together. The manufacturing method inevitably causes poor consistency of the stretching degree of the main reinforcement, so that the concrete pile has weak bending resistance and can be broken or deformed in the middle even in hoisting and transportation.

SUMMERY OF THE UTILITY MODEL

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

In order to solve the problems, the utility model provides a concrete 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; the two ends of the concrete square pile are provided with metal end plates connected with the reinforcement cage, and the metal end plates and the pile body connecting part are provided with hoops.

Preferably, the shape of the metal end plate is the same as that of the pile body of the concrete square pile, and welding grooves with inclination angles of 35-50 degrees are formed in four sides of the metal end plate.

Preferably, threading holes and tension holes are symmetrically formed between the central circular hole and four sides of the metal end plate, and each tension hole is connected with the threading hole through a rib groove.

Preferably, the threading hole and the tension hole are in a square layout, and the threading hole is a counter bore.

Preferably, the main frame rib is a steel bar, the main frame rib is parallel to the pile body contour line of the concrete square pile, and a heading is arranged at the joint of the steel bar and the metal end plate.

Preferably, the concrete square pile is square in shape, the pile core is a cylindrical middle hole, and corners on four sides of the pile core are in a stress relief arc shape.

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

The utility model provides a concrete square pile, 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 concrete square pile, 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 concrete square pile according to an embodiment of the present invention;

fig. 2 is a top view of the concrete square pile shown in fig. 1;

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

fig. 4 is a schematic structural view of an end plate and a hoop of a high-strength concrete square pile according to an embodiment of the present invention.

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

Fig. 1 is a schematic structural view of a concrete square pile according to an embodiment of the present invention; fig. 2 is a top view of the concrete square pile shown in fig. 1; fig. 3 is a schematic cross-sectional view of the concrete square pile shown in fig. 1. For clarity, the figure is referred to a three-axis vertical coordinate system, wherein the direction along the coordinate axis z is the axial direction of the concrete square pile, the direction along the coordinate axis x is the transverse direction of the cross section of the concrete square pile, and the direction along the coordinate axis y is the longitudinal direction of the cross section of the concrete square pile.

Specifically, referring to fig. 1 to 3, the hollow square pile includes a reinforcement cage 1 and concrete 2. The reinforcement cage 1 comprises a framework main reinforcement 11 and a stirrup 12, wherein the stirrup 12 is spirally and continuously welded on the framework main reinforcement 11; the hollow square pile is square in shape, the pile core is a cylindrical middle hole, and corners on four sides of the hollow square pile are in a stress relief arc shape, wherein the arc radius R1 of one arc angle of the hollow square pile is 30-40mm, and the arc angle is 90 degrees; the arc radius R2 of the other arc angles is 10-20mm, and the arc angles are also 90 degrees. The utility model discloses a pile body four sides corner of hollow square pile is stress relief arc for the stake material is not fragile when the construction hammering.

In another embodiment, the two ends of the concrete 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 the four sides of the two end plates are provided with welding grooves 32 with inclination angles of 35-50 degrees, so that the firmness of pile forming connection is enhanced.

In another embodiment, the main frame rib 11 is parallel to the pile body contour line.

Referring to fig. 1-2, 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 on the metal end plate 3 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 metal end plate 3 and pile body connecting part is provided with a hoop 4, as shown in fig. 1 and 4, 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.

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 concrete 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); the concrete square pile is characterized in that metal end plates (3) connected with the reinforcement cage (1) are arranged at two ends of the concrete square pile, and hoops (4) are arranged on the metal end plates (3) and the pile body connecting portion.

2. The concrete 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 concrete square pile, and the four sides of the end plate of the metal end plate (3) are provided with welding grooves (32) with 35-50 degrees of inclination angles.

3. The concrete square pile according to claim 2, wherein a threading hole (311) and tension holes (313) are symmetrically arranged between the central circular hole and four sides of the metal end plate (3), and each tension hole (313) is connected with the threading hole (311) through a rib groove (312).

4. The concrete square pile according to claim 3, wherein the threading holes (311) and the tension holes (313) are in a square arrangement, and the threading holes (311) are counter-sunk holes.

5. The concrete square pile according to claim 4, wherein the main frame rib (11) is a steel bar, the main frame rib (11) is parallel to the pile body contour line of the concrete square pile, and a heading is arranged at the joint of the steel bar and the metal end plate (3).

6. The concrete square pile of claim 5, wherein the concrete square pile is square in shape, the core is a cylindrical central hole, and corners of the core are in the shape of a stress relief arc.