阅读说明：本技术 一种预应力混凝土支护桩及其生产方法 (Prestressed concrete support pile and production method thereof ) 是由 金忠良 陈巧 葛明明 闫志波 陆立东 于 2021-09-02 设计创作，主要内容包括：本发明提供了一种预应力混凝土支护桩及其生产方法,包括波形混凝土桩身和连接板；所述波形混凝土桩身至少一个端面安装连接板,且所述连接板的轮廓小于混凝土桩身的轮廓。所述连接板的外径小于波形混凝土桩身横截面的外径,所述混凝土桩身横截面的内径小于所述连接板的内径。本发明具有结构简单、抗水平承载力高、造价低、施工效率高等特点,用工厂化预制生产,达到养护强度后出厂运往工地直接施工,可节省现场旋挖、放笼、混凝土浇筑等制作工序,减少工地现场人力成本。(The invention provides a prestressed concrete support pile and a production method thereof, wherein the prestressed concrete support pile comprises a corrugated concrete pile body and a connecting plate; and a connecting plate is arranged on at least one end face of the wave-shaped concrete pile body, and the outline of the connecting plate is smaller than that of the concrete pile body. The outer diameter of the connecting plate is smaller than the outer diameter of the cross section of the corrugated concrete pile body, and the inner diameter of the cross section of the concrete pile body is smaller than the inner diameter of the connecting plate. The invention has the characteristics of simple structure, high horizontal bearing capacity, low manufacturing cost, high construction efficiency and the like, is produced by factory prefabrication, is delivered to a construction site for direct construction after reaching the maintenance strength, can save the manufacturing procedures of site rotary digging, cage placing, concrete pouring and the like, and reduces the labor cost on the construction site.)

1. A prestressed concrete support pile is characterized by comprising an arc-shaped concrete pile body (1) and a connecting plate (2); and a connecting plate (2) is arranged on at least one end face of the circular arc-shaped concrete pile body (1), and the outline of the connecting plate (2) is smaller than that of the concrete pile body (1).

2. The prestressed concrete fender pile of claim 1, characterized in that the outer diameter of the connecting plate (2) is smaller than the outer diameter of the cross section of the circular arc-shaped concrete pile body (1), and the inner diameter of the cross section of the concrete pile body (1) is smaller than the inner diameter of the connecting plate.

3. The prestressed concrete support pile according to claim 1, wherein a baffle (6) is installed at the junction of adjacent circular arc-shaped concrete pile bodies (1).

4. The prestressed concrete support pile according to claim 1, wherein two sides of the cross section of the circular arc-shaped concrete pile body (1) are respectively provided with a rabbet (3), and the adjacent circular arc-shaped concrete pile bodies (1) are overlapped through the rabbets (3).

5. The prestressed concrete support pile according to claim 4, wherein the connecting plate (2) is provided with a protrusion (2-1) corresponding to the spigot (3), the circular arc shaped concrete pile body (1) is provided with a reinforcing structure, the reinforcing structure is located at the spigot (3), and one end of the reinforcing structure is connected with the connecting plate (2).

6. The prestressed concrete support pile according to claim 5, characterized in that the reinforcing structure comprises a reinforcing column (5) and/or a grout plate (9), the reinforcing column (5) is located inside the circular arc-shaped concrete pile body (1) at the seam allowance (3), and one end of the reinforcing column (5) is connected with the projection (2-1); the edge of the spigot (3) of the arc concrete pile body (1) is wrapped with a slurry baffle plate (9), and one end of the slurry baffle plate (9) is connected with the edge of the connecting plate (2).

7. The prestressed concrete support pile according to claim 1, wherein anchoring holes are uniformly distributed in the connecting plate (2), a tension hole (2-3) is arranged near each anchoring hole (2-2) in the connecting plate (2), and the anchoring holes (2-2) are communicated with the tension holes (2-3) through tendon passing grooves (2-4).

8. The prestressed concrete support pile according to claim 7, wherein an angle θ formed by a first axis from the center of the anchor hole (2-2) to the center of the connecting plate (2) and a second axis from the center of the tension hole (2-3) to the center of the connecting plate (2) is 5-15 °.

9. The prestressed concrete support pile according to any one of claims 1-8, wherein a plurality of prestressed reinforcements (4) are included in the circular arc-shaped concrete pile body (1), each prestressed reinforcement (4) comprises a reinforcement body, at least one end of each reinforcement body is provided with an upsetting cap (4-2), the minimum diameter of each upsetting cap (4-2) is larger than or equal to the diameter of each reinforcement body, each upsetting cap (4-2) penetrates through the end face of the concrete pile body (1), and each upsetting cap (4-2) is located in an anchor reinforcement hole of the connecting plate (2).

10. The prestressed concrete support pile according to claim 9, wherein a plurality of continuous spiral grooves (4-1) are circumferentially uniformly distributed on the outer surfaces of the steel bar body and the upsetting cap (4-2).

11. The prestressed concrete fender pile of claim 9, wherein the helical angle of the helical groove (4-1) is 35 ° to 60 °.

12. The prestressed concrete support pile according to claim 9, wherein a boss (4-4) is provided on the top of the heading cap (4-2).

13. The prestressed concrete fender pile of claim 12, wherein the height of the boss (4-4) is 0.1mm to 10 mm.

14. The prestressed concrete fender pile of claim 9, wherein the upset cap (4-2) is divided into an upper convex part (4-5) and a lower concave part (4-6) by taking the maximum cross-sectional area as a plane, the lower concave part (4-6) is connected with the steel bar body, and the ratio of the height of the upper convex part (4-5) to the height of the lower concave part (4-6) is 1/8-1/2.

15. The prestressed concrete support pile according to claim 9, wherein non-prestressed reinforcement (7) is further disposed in the circular arc-shaped concrete pile body (1), and the non-prestressed reinforcement (7) and the prestressed reinforcement (4) are alternately disposed.

16. A production method of a prestressed concrete support pile is characterized by comprising the following steps:

manufacturing an integral reinforcement cage;

mounting the connecting plate (2) and a component for prestress tension on a cage rib framework cage;

cutting off stirrups of the steel reinforcement framework cage according to the appearance of the support pile, forming hooks on the cut stirrups, and binding the hooks with the steel reinforcement main body;

filling a reinforcement cage into a mold; distributing and tensioning concrete; and (5) demolding the product.

17. The method for producing a prestressed concrete fender pile according to claim 16, characterized by further comprising the steps of:

when the reinforcing cage is installed at the end part of the reinforcing cage, a plurality of reinforcing structures are installed at the edge of the connecting plate (2), and the reinforcing structures are located in the reinforcing cage or/and are in contact with the reinforcing cage.

18. The method for producing the prestressed concrete support pile according to claim 16, wherein the stirrups of the reinforcement cage are cut off according to the appearance of the support pile, and the stirrups are formed into hooks and then bound with the reinforcement body, and the method specifically comprises the following steps:

cutting off the stirrups at one side of the steel reinforcement framework cage, forming hooks on the cut stirrups, and binding the hooks with the steel reinforcement main body;

cutting off stirrups on the other side of the steel reinforcement framework cage at intervals;

and (3) putting the integral reinforcement cage into a mold, cutting off the residual stirrups on the other side of the reinforcement cage, and binding the cut stirrups with the reinforcement main body after forming hooks.

19. The method for producing the prestressed concrete support pile according to claim 16, wherein the stirrups of the reinforcement cage are cut off according to the appearance of the support pile, and the stirrups are formed into hooks and then bound with the reinforcement body, and the method specifically comprises the following steps:

cutting off stirrups at two sides of the steel reinforcement framework cage, and preventing the steel reinforcement framework cage from deforming through a tool in the cutting-off process;

forming a hook on the cut stirrup and binding the hook with the main body of the steel bar; and (5) the cut steel reinforcement framework is filled into a die through a tool.

Technical Field

The invention relates to a support pile for retaining structures of earth, embankments, revetments and river and lake weirs in constructional engineering and a production method thereof, in particular to a prestressed concrete support pile and a production method thereof.

Background

At present, a retaining and supporting structure is required to be arranged in engineering construction such as foundation pit excavation, river regulation and the like, and the conventional supporting method mainly comprises a concrete cast-in-place pile, an underground continuous wall, a self-standing cement retaining wall, an SMW method, a steel sheet pile, a precast concrete sheet pile and the like. Although the supporting methods such as the SMW method and the steel sheet pile have higher bending resistance, a large amount of steel is consumed, the cost is overhigh, and the defects of poor corrosion resistance, high later maintenance cost and the like exist when the supporting method is used as a long-term supporting structure. In addition, the SMW method is relatively complex in construction and is easy to cause construction quality problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the prestressed concrete support pile and the production method thereof, the prestressed concrete support pile has the characteristics of simple structure, high horizontal bearing capacity resistance, low manufacturing cost, high construction efficiency and the like, is produced by factory prefabrication, is delivered to a construction site after reaching the maintenance strength and is directly constructed, can save the manufacturing procedures of site rotary digging, cage placing, concrete pouring and the like, and reduces the labor cost of the construction site.

The present invention achieves the above-described object by the following technical means.

A prestressed concrete support pile comprises an arc-shaped concrete pile body and a connecting plate; and a connecting plate is arranged on at least one end face of the circular arc-shaped concrete pile body, and the outline of the connecting plate is smaller than that of the concrete pile body.

Further, the outer diameter of the connecting plate is smaller than that of the cross section of the circular arc-shaped concrete pile body, and the inner diameter of the cross section of the concrete pile body is smaller than that of the connecting plate.

And furthermore, baffle plates are arranged at the joint of the adjacent circular arc-shaped concrete pile bodies.

Furthermore, both sides of the cross section of the circular arc-shaped concrete pile body are respectively provided with a seam allowance, and the adjacent circular arc-shaped concrete pile bodies are lapped through the seam allowances.

Furthermore, the connecting plate is provided with a protruding part corresponding to the seam allowance, the arc-shaped concrete pile body is provided with a reinforcing structure, the reinforcing structure is located at the seam allowance, and one end of the reinforcing structure is connected with the connecting plate.

Further, the reinforcing structure comprises a reinforcing column and/or a slurry baffle, the reinforcing column is positioned inside the circular arc-shaped concrete pile body at the seam allowance, and one end of the reinforcing column is connected with the protruding part; and a grout baffle is wrapped at the edge of the spigot of the circular arc concrete pile body, and one end of the grout baffle is connected with the edge of the connecting plate.

Further, anchor holes are uniformly distributed in the connecting plate, a tensioning hole is formed in the position, close to each anchor hole, in the connecting plate, and the anchor holes are communicated with the tensioning holes through rib passing grooves.

Furthermore, the included angle theta between a first axis from the center of the anchoring hole to the center of the connecting plate and a second axis from the center of the tensioning hole to the center of the connecting plate is 5-15 degrees.

Further, including a plurality of prestressed reinforcement in the convex concrete pile body, prestressed reinforcement includes the reinforcing bar main part, the at least one end of reinforcing bar main part is equipped with the upset cap, the minimum diameter more than or equal to reinforcing bar main part diameter of upset cap, the upset cap passes concrete pile body terminal surface, just the upset cap is located the anchor muscle hole of connecting plate.

Furthermore, a plurality of continuous spiral grooves are uniformly distributed on the outer surfaces of the steel bar main body and the upsetting cap in the circumferential direction.

Further, the helix angle of the spiral groove is 35-60 degrees.

Further, the top of the heading cap is provided with a boss.

Further, the height of the boss is 0.1 mm-10 mm.

Further, the upsetting cap is divided into an upper convex part and a lower concave part by taking the maximum cross-sectional area as a plane, the lower concave part is connected with the steel bar main body, and the ratio of the height of the upper convex part to the height of the lower concave part is 1/8-1/2.

Furthermore, non-prestressed reinforcements are further arranged in the arc-shaped concrete pile body, and the non-prestressed reinforcements and the prestressed reinforcements are arranged in a staggered mode.

A production method of a prestressed concrete support pile comprises the following steps:

manufacturing an integral reinforcement cage;

mounting a connecting plate and a component for prestress tension on a cage rib framework cage;

cutting off stirrups of the steel reinforcement framework cage according to the appearance of the support pile, forming hooks on the cut stirrups, and binding the hooks with the steel reinforcement main body;

filling a reinforcement cage into a mold; distributing and tensioning concrete; and (5) demolding the product.

Further, the method also comprises the following steps:

when the connecting plate at the end part of the steel reinforcement framework cage is installed, a plurality of reinforcing columns are installed at the edge of the connecting plate, and the reinforcing columns are located in the steel reinforcement framework cage.

Further, cut off the stirrup of framework of steel reinforcement cage according to a fender pile appearance to with the reinforcement behind the stirrup formation crotch with the reinforcement main part ligature, specifically include following step:

cutting off the stirrups at one side of the steel reinforcement framework cage, forming hooks on the cut stirrups, and binding the hooks with the steel reinforcement main body;

cutting off the spiral ribs on the other side of the steel reinforcement cage at intervals;

and (3) putting the integral reinforcement cage into a mold, cutting off the residual stirrups on the other side of the reinforcement cage, and binding the cut stirrups with the reinforcement main body after forming hooks.

Further, cut off the stirrup of framework of steel reinforcement cage according to a fender pile appearance to with the reinforcement behind the stirrup formation crotch with the reinforcement main part ligature, specifically include following step:

cutting off stirrups at two sides of the steel reinforcement framework cage, and preventing the steel reinforcement framework cage from deforming through a tool in the cutting-off process;

forming a hook on the cut stirrup and binding the hook with the main body of the steel bar; and (5) putting the reinforcement cage cut by the tool into a mould.

The invention has the beneficial effects that:

1. the prestressed concrete support pile has the characteristics of simple structure, high horizontal bearing capacity, low manufacturing cost, high construction efficiency and the like, is produced by factory prefabrication, is delivered to a construction site after reaching the maintenance strength, is directly constructed, can save the manufacturing procedures of site rotary digging, cage placing, concrete pouring and the like, and reduces the labor cost of the construction site.

2. According to the prestressed concrete support pile, the boss is arranged at the top of the upsetting cap, when the end part of the reinforcing steel bar is impacted by external load, the end plate and the concrete axially deform to enable the upsetting cap of the reinforcing steel bar to be directly contacted with external impact force, and at the moment, the boss can firstly counteract a part of the impact force to prevent the upsetting cap of the reinforcing steel bar from being damaged, so that the connection quality of the main reinforcing steel bar is influenced.

3. According to the prestressed concrete support pile, the outer diameter of the connecting plate is smaller than the outer diameter of the cross section of the concrete pile body, so that when adjacent support piles are spliced, the piles can be effectively engaged, and the connecting plate is prevented from being in direct contact with the piles.

4. According to the prestressed concrete support pile, the minimum diameter of the upsetting cap is larger than or equal to the diameter of the steel bar main body, the upsetting cap is divided into the upper convex part and the lower concave part by taking the maximum cross-sectional area as a plane, the stress concentration phenomenon generated by the upsetting head in the tensioning process of the steel bar is effectively reduced, the deformation of the upsetting head at the joint of the upsetting head and the steel bar body is effectively avoided, and the tensile property of the steel bar is improved.

5. According to the production method of the prestressed concrete support pile, the integral reinforcement cage is manufactured, the stirrups of the reinforcement cage are cut off according to the appearance of the support pile, the cut stirrups form hooks and then are bound with the reinforcement main body, and compared with the method that the reinforcement cage is manufactured in a split mode, the production method of the prestressed concrete support pile saves working hours and improves efficiency. More importantly, the deformation of the split-type manufactured steel reinforcement cage can be prevented.

6. According to the production method of the prestressed concrete support pile, the edge of the connecting plate is provided with the plurality of reinforcing columns, so that the connecting force of the connecting plate and the concrete pile body is increased, and the driving resistance of the pile head of the support pile is enhanced. Particularly, the die can be placed at the position of the seam allowance to be damaged in the demoulding process.

7. According to the production method of the prestressed concrete support pile, the grout blocking plates are arranged on the edges of the two sides of the connecting plate, so that the edge of the rabbet of the circular arc-shaped concrete pile body can be wrapped, grout can be blocked in the forming process, and grout leakage is avoided.

Drawings

Fig. 1 is a perspective view of a prestressed concrete fender pile according to the present invention.

Fig. 2 is a front view of a connection plate according to the invention.

Fig. 3 is a front view of fig. 1.

Fig. 4 is a sectional view of a prestressed concrete fender pile according to example 1.

Fig. 5 is a sectional view of a prestressed concrete fender pile according to example 2.

Fig. 6 is a schematic view illustrating the installation of the prestressed concrete support piles according to embodiment 1.

Fig. 7 is a schematic view illustrating the installation of the prestressed concrete support piles according to embodiment 2.

Fig. 8 is a three-dimensional view of a prestressed reinforcement according to the present invention.

Fig. 9 is a front view of a prestressed reinforcement according to the present invention.

Fig. 10 is a top view of fig. 9.

Fig. 11 is a bottom view of fig. 9.

In the figure:

1-circular arc concrete pile body; 2-connecting plates; 2-1-projection; 2-2-anchor holes; 2-3-tensioning holes; 2-4-rib passing grooves; 3-stopping the mouth; 4-prestressed reinforcement; 4-1-spiral grooves; 4-2-heading cap; 4-4-boss; 4-5-upper convex part; 4-6-undercut; 5-reinforcing columns; 6-a baffle plate; 7-non-prestressed reinforcement; 8-stirrup; 3-1-straight line segment; 3-2-corner transition arc; 3-3-diagonal segment; 3-4-lower transition arc; 9-a baffle plate.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 and 3, the prestressed concrete support pile of the present invention includes a circular arc concrete pile body 1 and a connecting plate 2; and a connecting plate 2 is arranged on at least one end face of the circular arc-shaped concrete pile body 1, and the outline of the connecting plate 2 is smaller than that of the concrete pile body 1. The profile of the connecting plate 2 is smaller than the profile of the concrete pile body 1, which can be understood that the profile of the connecting plate 2 is completely smaller than the profile of the concrete pile body 1, and can also be understood that only part of the edge of the profile of the connecting plate 2 is smaller than the edge corresponding to the profile of the concrete pile body 1. For construction convenience, the outer diameter of the connecting plate 2 is smaller than that of the cross section of the circular arc-shaped concrete pile body 1, and the inner diameter of the cross section of the concrete pile body 1 is smaller than that of the connecting plate.

The cross section of the circular arc concrete pile body 1 in the embodiment 1 is in a semicircular ring shape, as shown in fig. 4; in the assembling process, a baffle 6 is arranged on the arc surface adjacent to the arc concrete pile body 1, and the baffle 6 is positioned outside the joint of the adjacent arc concrete pile bodies 1 and used for retaining soil and water, as shown in fig. 6.

In the embodiment 2, the two sides of the cross section of the circular arc concrete pile body 1 are respectively provided with the rabbets 3, that is, the two bottoms of the circular arc concrete pile body 1 with the semicircular cross section are respectively provided with the rabbets 3, as shown in fig. 3 and 5; the cross section of the spigot 3 comprises a semicircular ring bottom, a straight line section 3-1, a corner transition arc 3-2, an oblique line section 3-3 and a lower transition arc 3-4, one end of the oblique line section 3-3 is in transition with the semicircular ring bottom through the lower transition arc 3-4, the other end of the oblique line section 3-3 is in transition with one end of the straight line section 3-1 through the corner transition arc 3-2, and the other end of the straight line section 3-1 extends to a semicircular annular excircle. Wherein, the radius of the lower transition arc 3-4 is larger than the radius of the corner transition arc 3-2. As shown in fig. 7, adjacent prestressed concrete support piles are overlapped by the seam allowance 3.

As shown in fig. 2, a protruding portion 2-1 corresponding to the seam allowance 3 is arranged on the connecting plate 2, a reinforcing structure is arranged on the arc-shaped concrete pile body 1, the reinforcing structure is located at the seam allowance 3, and one end of the reinforcing structure is connected with the connecting plate 2. As shown in fig. 5, the reinforcing structure comprises a reinforcing column 5 and/or a grout baffle 9, the reinforcing column 5 is positioned inside the circular arc-shaped concrete pile body 1 at the seam allowance 3, and one end of the reinforcing column 5 is connected with the protruding part 2-1; the edge of the spigot 3 of the arc concrete pile body 1 is wrapped with the slurry baffle 9, and one end of the slurry baffle 9 is connected with the edge of the connecting plate 2, so that slurry can be blocked in the forming process, and slurry leakage is avoided. The edge of the spigot 3 is wrapped with the baffle plate 9, the baffle plate 9 can be wrapped by the spigot 3 along the axial direction, or the baffle plate 9 can be wrapped by the spigot 3 along the axial direction within a certain distance at two ends of the arc-shaped concrete pile body 1.

Anchoring holes are uniformly distributed in the connecting plate 2 in the embodiment 1 and the embodiment 2, a tensioning hole 2-3 is arranged near each anchoring hole 2-2 in the connecting plate 2, and the anchoring holes 2-2 are communicated with the tensioning holes 2-3 through rib passing grooves 2-4. An included angle theta between a first axis from the circle center of the anchoring hole 2-2 to the center of the connecting plate 2 and a second axis from the circle center of the tensioning hole 2-3 to the center of the connecting plate 2 is 5-15 degrees.

As shown in fig. 8 and 9, the arc-shaped concrete pile body 1 includes a plurality of prestressed reinforcements 4 therein, the prestressed reinforcements 4 include a reinforcement body, at least one end of the reinforcement body is provided with an upsetting cap 4-2, and the reinforcement body and the upsetting cap 4-2 are in smooth transition. The minimum diameter of the upsetting cap 4-2 is larger than or equal to the diameter of the steel bar body, and the upsetting cap 4-2 is a revolving body with gradually changed diameter, and the diameter of one end, contacting with the steel bar body, of the upsetting cap 4-2 is close to or the same as the diameter of the steel bar body. The upsetting cap 4-2 penetrates through the end face of the concrete pile body 1, and the upsetting cap 4-2 is located in the anchor bar hole 2-2 of the connecting plate 2. And non-prestressed reinforcements 7 are further arranged in the circular arc-shaped concrete pile body 1, and the non-prestressed reinforcements 7 and the prestressed reinforcements 4 are arranged in a staggered mode.

As shown in fig. 8 and 9, a plurality of continuous spiral grooves 4-1 are uniformly distributed on the periphery of the outer surfaces of the steel bar body and the upsetting cap 4-2. The continuous spiral groove 4-1 can be understood as a spiral groove 4-1 formed on the outer surface of the steel bar body, a spiral groove 4-1 formed on the outer surface of the upsetting cap 4-2, and the spiral groove 4-1 formed on the outer surface of the upsetting cap 4-2 and the spiral groove 4-1 formed on the outer surface of the steel bar body are communicated with each other and still maintain a spiral shape, as shown in fig. 9 and 10. The spiral angle of the spiral groove 4-1 is 35-60 degrees. The spiral grooves 4-1 are formed in the surface of the upsetting cap 4-2, so that the engaging force with the end plate 1 is enhanced, and the steel bar is effectively prevented from rotating when the steel bar framework cage is manufactured.

As shown in FIGS. 9 and 10, a boss 4-4 is provided on the top of the heading cap 4-2. The boss 4-4 is cylindrical or truncated cone-shaped. When the end part of the reinforcing steel bar is impacted by external load, the end plate 1 and the concrete are axially deformed to enable the upsetting cap 4-2 to be directly contacted with external impact force, at the moment, the boss 4-4 can firstly counteract a part of the impact force, and the upsetting cap 4-2 is prevented from being damaged, so that the connection quality of the main reinforcing steel bar is influenced. The boss 4-4 is cylindrical, the height of the boss 4-4 is 0.1 mm-10 mm, and the outer diameter of the boss 4-4 is 6.5 mm-20 mm; the boss 4-4 is in a round table shape, the height of the boss 4-4 is 0.1 mm-10 mm, the maximum outer diameter of the boss 4-4 is 6.5 mm-14 mm, and the minimum outer diameter of the boss 4-4 is 4.5 mm-12.6 mm.

As shown in FIG. 9, the upset cap 4-2 is divided into an upper convex part 4-5 and a lower concave part 4-6 by taking the maximum cross-sectional area as a plane, the lower concave part 4-6 is connected with the steel bar body, the lower concave part 4-6 can be regarded as a smooth transition section gradually changing from the maximum cross-sectional area to the steel bar body, the upper part of the upper convex part 4-5 is provided with a boss 4-4, and the ratio of the height of the upper convex part 4-5 to the height of the lower concave part 4-6 is 1/8-1/2. The upper convex parts 4-5 and the lower concave parts 4-6 can effectively reduce the stress concentration phenomenon generated by the upset head in the tensioning process of the steel bar, effectively avoid the deformation of the upset head at the joint of the upset head and the bar body and improve the tensile property of the steel bar.

Embodiment 3, the method for producing a prestressed concrete support pile according to the present invention includes the steps of:

blanking and processing the prestressed reinforcement at fixed length: blanking and cutting the prestressed reinforcement 4 to a certain length according to design requirements, and then heading at least one end of the prestressed reinforcement;

and (3) weaving a cage by using a steel bar framework: performing roll welding and cage weaving on the prestressed reinforcement 4 and the stirrup 8 to enable the prestressed reinforcement 4 and the stirrup 8 to form an integral reinforcement cage; the cross section of the whole reinforcement cage of the support pile is cylindrical.

The connecting plate and the steel reinforcement cage are installed: the connecting plate 2 and the component for prestress tension are arranged on a cage rib framework cage, the spiral ribs on one side of the cage rib framework cage are all cut off, and the stirrup is hooked to 180 degrees and firmly bound with the main rib, so that the spiral ribs are prevented from being exposed. And then the reinforcement cage is turned over to temporarily not cut the opposite side at every other meter. A plurality of reinforcing columns 5 are welded at the edge of the connecting plate 2, and the reinforcing columns 5 are positioned in the reinforcement cage. The general reinforcing column 5 is welded at the protruding part 2-1 of the connecting plate 2, and the reinforcing column 5 can be a steel bar and is used for increasing the connecting force of the connecting plate and the concrete pile body and enhancing the driving resistance of the pile head of the support pile. The two side edges of the connecting plate 2 are provided with the slurry baffles 9, and the slurry baffles 9 are in contact with the reinforcement cage, so that slurry can be blocked in the forming process, and slurry leakage is avoided. Treating the die: after cleaning the upper and lower dies for producing the support piles, coating the isolating agent, and facilitating demoulding after maintenance of the support piles.

And (3) entering a steel reinforcement framework cage into a mold: when the reinforcement cage framework is put into a mold, the prestressed main reinforcements are straightened, and whether the hoops at the cut-off parts are not hooked in place and whether loose hoops are bound in place or not is checked. And (3) putting the integral reinforcement cage into a mold, cutting off the residual stirrups on the other side of the reinforcement cage, and binding the cut stirrups with the reinforcement main body after forming hooks.

Concrete distribution and tensioning: after the concrete material is arranged in the inner cavity of the lower die of the die, the upper die of the die is closed and then prestressed tensioning is carried out; or after the upper die of the die is closed, the concrete material is arranged in the inner cavity of the lower die of the die and then is subjected to prestress tensioning;

centrifuging and maintaining;

demolding: and at least one lifting bolt is arranged in a tensioning screw hole on the connecting plate 2 during demoulding, and a lifting hook is hung on the lifting bolt to obtain a finished supporting pile. Demolding can also be carried out: during demoulding, at least one lifting bolt is installed in a tensioning hole in the connecting plate 2, a lifting hook is hung behind the lifting bolt, after lifting, the height of the lifting bolt is about 30 cm-200 cm away from the side edge of the lower half mould of the mould, two supporting piles with semicircular sections are bound by adopting a plurality of steel belts, the width of each steel belt is 3 cm-10 cm, the thickness of each steel belt is 1 mm-6 mm, and therefore the two supporting pile finished products temporarily form a whole circle, and later stacking and transportation are facilitated.

Embodiment 4, the method for producing a prestressed concrete support pile according to the present invention includes the steps of:

blanking and processing the prestressed reinforcement at fixed length: blanking and cutting the prestressed reinforcement 4 to a certain length according to design requirements, and then heading at least one end of the prestressed reinforcement;

blanking non-prestressed reinforcement in fixed length: cutting the non-prestressed reinforcement 7 into a certain length according to design requirements, and then performing thread turning on at least one end of the prestressed reinforcement; wherein the blanking length of the non-prestressed reinforcement is 5 cm-50 cm less than that of the prestressed reinforcement;

and (3) weaving a cage by using a steel bar framework: performing roll welding and cage weaving on the prestressed reinforcement 4, the non-prestressed reinforcement 7 and the stirrup 8 to enable the prestressed reinforcement, the non-prestressed reinforcement and the bolt stirrup to form an integral reinforcement cage; or performing roll welding and cage weaving on the prestressed reinforcement 4 and the stirrup 8 to enable the prestressed reinforcement 4 and the stirrup 8 to form an integral reinforcement cage, and binding the non-prestressed reinforcement at the inner side of the reinforcement cage at one time;

the connecting plate and the steel reinforcement cage are installed: the connecting plate 2 and the component for prestress tension are arranged on a cage rib framework cage, the spiral ribs on one side of the cage rib framework cage are all cut off, and the stirrup is hooked to 180 degrees and firmly bound with the main rib, so that the spiral ribs are prevented from being exposed. And then the reinforcement cage is turned over to temporarily not cut the opposite side at every other meter. A plurality of reinforcing columns 5 are welded at the edge of the connecting plate 2, and the reinforcing columns 5 are positioned in the reinforcement cage. The general reinforcing column 5 is welded at the protruding part 2-1 of the connecting plate 2, and the reinforcing column 5 can be a steel bar and is used for increasing the connecting force of the connecting plate and the concrete pile body and enhancing the driving resistance of the pile head of the support pile. The two side edges of the connecting plate 2 are provided with the slurry baffles 9, and the slurry baffles 9 are in contact with the reinforcement cage, so that slurry can be blocked in the forming process, and slurry leakage is avoided.

Treating the die: after cleaning the upper and lower dies for producing the support piles, coating the isolating agent, and facilitating demoulding after maintenance of the support piles.

And (3) entering a steel reinforcement framework cage into a mold: when the reinforcement cage framework is put into a mold, the prestressed main reinforcements are straightened, and whether the hoops at the cut-off parts are not hooked in place and whether loose hoops are bound in place or not is checked. And (3) putting the integral reinforcement cage into a mold, cutting off the residual stirrups on the other side of the reinforcement cage, and binding the cut stirrups with the reinforcement main body after forming hooks.

Concrete distribution and tensioning: after the concrete material is arranged in the inner cavity of the lower die of the die, the upper die of the die is closed and then prestressed tensioning is carried out; or after the upper die of the die is closed, the concrete material is arranged in the inner cavity of the lower die of the die and then is subjected to prestress tensioning;

centrifuging and maintaining;

demolding: and (2) obtaining a supporting pile finished product after demoulding, installing at least one lifting bolt in a tension screw hole on the connecting plate during demoulding, hanging a lifting hook behind the lifting bolt, lifting, and binding two supporting piles with semicircular sections by adopting a plurality of steel belts, wherein the width of each steel belt is 3 cm-10 cm, and the thickness of each steel belt is 1 mm-6 mm, so that the two supporting pile finished products temporarily form a whole circle, and the supporting piles are convenient to stack and transport at the later stage.

Example 5: the production method of the prestressed concrete support pile comprises the following steps:

weaving a reinforcement cage;

the connecting plate and the steel reinforcement cage are installed: mounting the connecting plate 2 and a component for prestress tension on a cage reinforcement cage, cutting stirrups 8 on two sides of the reinforcement cage, and preventing the reinforcement cage from deforming through a tool in the cutting process; and the stirrup is hooked to 180 degrees and firmly bound with the main reinforcement, so that the spiral reinforcement is prevented from being exposed. A plurality of reinforcing columns 5 are welded at the edge of the connecting plate 2, and the reinforcing columns 5 are positioned in the reinforcement cage. The general reinforcing column 5 is welded at the protruding part 2-1 of the connecting plate 2, and the reinforcing column 5 can be a steel bar and is used for increasing the connecting force of the connecting plate and the concrete pile body and enhancing the driving resistance of the pile head of the support pile. The two side edges of the connecting plate 2 are provided with the slurry baffles 9, and the slurry baffles 9 are in contact with the reinforcement cage, so that slurry can be blocked in the forming process, and slurry leakage is avoided.

Treating the die: after cleaning the upper and lower dies for producing the support piles, coating the isolating agent, and facilitating demoulding after maintenance of the support piles.

And (3) entering a steel reinforcement framework cage into a mold: and (5) the cut steel reinforcement framework is filled into a die through a tool. When the reinforcement cage framework is put into a mold, the prestressed main reinforcements are straightened, and whether the hoops at the cut-off parts are not hooked in place and whether loose hoops are bound in place or not is checked.

Concrete distribution and tensioning: after the concrete material is arranged in the inner cavity of the lower die of the die, the upper die of the die is closed and then prestressed tensioning is carried out; or after the upper die of the die is closed, the concrete material is arranged in the inner cavity of the lower die of the die and then is subjected to prestress tensioning;

centrifuging and maintaining;

demolding: and (2) obtaining a supporting pile finished product after demoulding, installing at least one lifting bolt in a tension screw hole on the connecting plate during demoulding, hanging a lifting hook behind the lifting bolt, lifting, and binding two supporting piles with semicircular sections by adopting a plurality of steel belts, wherein the width of each steel belt is 3 cm-10 cm, and the thickness of each steel belt is 1 mm-6 mm, so that the two supporting pile finished products temporarily form a whole circle, and the supporting piles are convenient to stack and transport at the later stage.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.