CN215105282U - Prestressed reinforcement and reinforced precast pile comprising same - Google Patents

Abstract

The utility model relates to a prestressed reinforcement, including the reinforcing bar body and the reinforcing bar upsetting cap of setting in reinforcing bar one end at least, the top of reinforcing bar upsetting cap is equipped with boss and hoop recess, and the top edge of reinforcing bar upsetting cap is equipped with vertical recess, and the main part of reinforcing bar upsetting cap still includes convex part and lower concave part, and the upper end of lower concave part links to each other with last convex part, and the lower extreme links to each other with the reinforcing bar body, goes up convex part and lower concave part contact department and is the maximum dimension department of reinforcing bar upsetting cap. The utility model also discloses an enhancement mode precast pile. The utility model discloses a set up the boss, when making the reinforcing bar tip receive the external load and assault, can offset some impact force earlier, avoid the reinforcing bar to upset the head impaired to improve prestressed reinforcement's quality. The reinforced precast pile of the embodiment combines the prestressed reinforcement and the pile end anchoring plate and has the characteristics of simple structure, high resistance to pulling and horizontal bearing capacity, excellent performance of the reinforcement anchoring plates at two ends of the pile, low cost, high construction efficiency and the like.

Description

Prestressed reinforcement and reinforced precast pile comprising same

Technical Field

The utility model relates to a building engineering technical field especially relates to a prestressed reinforcement and contain its enhancement mode precast pile.

Background

With the improvement of the importance degree of modern buildings and the continuous increase of the building height, higher requirements are put forward on the bearing capacity of the foundation, the natural foundation cannot better bear the load transmitted by the upper buildings, concrete piles are used as foundation piles of the foundation, and the piles are pressed into the ground by a pile pressing machine to form foundation piles, so that the upper parts of the foundation piles bear the buildings. Most precast concrete piles are prestressed piles, and anchor end plates are arranged at two ends of the piles and mainly used for anchoring prestressed steel bars after being tensioned, so that the performance of the prestressed steel bars becomes the key for ensuring the performance of the precast piles.

The upsetting cap of the prestressed reinforcement in the prior art is generally cylindrical, and although the shape is convenient to manufacture, due to the limitation of the shape, the reinforcement is pulled after being assembled, stress concentration easily occurs at the clamping joint of the upsetting cap and the end plate, so that the necking of the upsetting cap is damaged, the quality of the pile body reinforcement is damaged, and adverse effects are caused on the stability of the precast pile.

SUMMERY OF THE UTILITY MODEL

For solving current technical problem, the utility model provides a prestressing steel and contain its enhancement mode precast pile.

The utility model discloses specific content as follows: the utility model provides a prestressed reinforcement, includes the reinforcing bar body and sets up the reinforcing bar at reinforcing bar one end at least and upset the cap, the top that the reinforcing bar was upset the cap is equipped with boss and hoop recess, and the top edge that the reinforcing bar was upset the cap is equipped with vertical recess, and the main part that the reinforcing bar was upset the cap still includes convex part and lower concave part, and the upper end of lower concave part links to each other with last convex part, and the lower extreme links to each other with the reinforcing bar body, goes up convex part and lower concave part contact department and is the maximum size department that the cap was upset to the reinforcing bar.

Furthermore, the reinforcing steel bar body is provided with concave lines and convex lines which are arranged at intervals.

Further, the concave lines and the convex lines are spirally arranged on the reinforcing steel bar body and extend to the top of the reinforcing steel bar heading cap.

Furthermore, the longitudinal included angle alpha of the straight line of the concave lines or the convex lines and the reinforcing steel bar body is 35-60 degrees.

Further, the height ratio of the upper convex part to the lower concave part is 1/8-1/2.

Furthermore, the boss is cylindrical, the height of the boss is 0.1 mm-10 mm, and the outer diameter of the boss is 6.5 mm-14 mm.

Furthermore, the boss is in a round table shape, the height is 0.1 mm-10 mm, the maximum outer diameter is 6.5 mm-14 mm, and the minimum outer diameter is 4.5 mm-12.6 mm.

Furthermore, the distance between the outer edge of the boss and the circumferential groove is 3-10 mm.

Furthermore, a sealing device is arranged on the outer side of the steel bar upsetting cap, and the sealing device comprises a non-metal material capable of bearing at least 60 degrees of temperature.

The application also discloses an enhanced precast pile, which comprises any one of the prestressed reinforcements, a spiral stirrup, concrete, a pile hoop and a pile end anchoring plate;

the spiral stirrups are arranged at the outer sides of the plurality of prestressed reinforcements, concrete wraps the prestressed reinforcements and the spiral stirrups, the pile end anchoring plates are arranged at two ends of the precast pile, and the pile hoops are respectively connected with the concrete and the pile end anchoring plates; the pile end anchoring plate is provided with a tensioning screw hole and a steel bar anchoring hole, and the steel bar upsetting cap is arranged in the steel bar anchoring hole.

Furthermore, the thickness of the pile end anchoring plate is larger than that of the steel bar upsetting cap.

Furthermore, the inner side of the pile hoop is provided with a metal indentation.

Further, the tensioning screw hole and the reinforcing steel bar anchoring hole are separated from each other.

The utility model has the advantages that: through setting up the boss, when making the reinforcing bar tip receive external load and assault, can offset a part of impact force earlier, avoid the reinforcing bar to upset the head impaired to improve the quality of prestressing steel. Simultaneously the utility model discloses be used in when no end plate precast pile, use with the sleeve combination, make the back is connected to upper segment stake, the stress transmission of upper and lower section stake of being convenient for. The reinforced precast pile of the embodiment combines the prestressed reinforcement and the pile end anchoring plate and has the characteristics of simple structure, high resistance to pulling and horizontal bearing capacity, excellent performance of the reinforcement anchoring plates at two ends of the pile, low cost, high construction efficiency and the like.

Drawings

The following further explains the embodiments of the present invention with reference to the drawings.

Fig. 1 is a schematic perspective view of a reinforcing bar according to example 1;

fig. 2 is a schematic front view of the reinforcing bar of example 1;

FIG. 3 is an enlarged view of a portion a of FIG. 2;

FIG. 4 is a schematic view of FIG. 2 in the direction AA;

FIG. 5 is a schematic view of the BB of FIG. 2;

fig. 6 is a schematic front view of the reinforcing bar of example 2;

FIG. 7 is a schematic view of FIG. 6 in the direction AA;

FIG. 8 is a schematic view of the BB of FIG. 6;

fig. 9 is a schematic front view of the reinforcing bar of example 3;

FIG. 10 is a schematic view of FIG. 9 in the direction AA;

FIG. 11 is a schematic view of the BB of FIG. 9;

fig. 12 is a schematic view of a precast pile of embodiment 4.

Detailed Description

Example 1

As shown in fig. 1-5, this embodiment discloses a prestressed reinforcement, including the reinforcing bar body 1 and set up reinforcing bar heading cap 2 in reinforcing bar body 1 one end, the whole circular that is the plane in top of reinforcing bar heading cap 2. The top end plane central position of reinforcing bar upsetting cap 2 is equipped with columniform boss 21, is equipped with annular recess 22 in the top end plane of reinforcing bar upsetting cap 2, the outer lane of boss 21, is equipped with vertical recess 23 at the planar edge in top.

The main body portion of the reinforcing bar heading cap 2, i.e., below the top end plane, includes an upper convex portion 24 and a lower concave portion 25, the upper convex portion 24 is connected at one end to the top end plane and at the other end to the top of the lower concave portion 25, and the plane where the upper convex portion 24 and the lower concave portion 25 are in contact is the maximum dimension of the reinforcing bar heading cap 2, which is shown in a front view as the maximum dimension line of the reinforcing bar (shown as a dotted line in fig. 2). Upper projection 24 extends from the edge of the top end plane to the maximum dimension line, and upper projection 24 is generally downwardly arcuate in curvature in the front view direction. The lower recess 25 extends from the end edge of the reinforcing bar body 1 to the maximum dimension line, the lower recess 25 is integrally curved upward in the front view direction, and the lower recess 25 is gently connected to the end edge of the reinforcing bar body 1. In the present embodiment, the height ratio of the upper convex portion 24 to the lower concave portion 25 is 1/8-1/2. By the size distribution of the upper convex part 24 and the lower concave part 25, the stress born by the steel bar heading can be improved, and the damage in the maximum stress area can be prevented.

In this embodiment, the height of the cylindrical boss 21 is 0.1mm to 10mm, and the outer diameter (i.e., the diameter of the bottom surface of the boss 21) is 6.5mm to 14 mm. The circumferential groove 22 surrounds the boss 21 and is depressed in the top plane of the reinforcing bar heading cap 2. The distance between the outer edge of the boss 21 and the circumferential groove 22 is 3 mm-10 mm, and the distance here refers to the distance between the edge of the boss 21 and the edge of the circumferential groove 22 in the diameter direction of the bottom surface circle of the boss 21 on the top end plane. In actual production, the distance is determined according to the specification and the size of the reinforcing steel bar, the boss 21, the heading mechanism and the like. The size of each position of the upset head structure of reinforcing bar that this embodiment set up can improve 21 and the intensity of circumferential groove 22 on the one hand, increases the impact force that it can bear, and on the other hand can make things convenient for the preparation, can cooperate the installation well with supporting pile tip anchor plate and use.

The outside of the reinforcing steel bar is also provided with concave grains 11 and convex grains 12, the concave grains 11 and the convex grains 12 are mutually spaced and spirally arranged on the bar body and the reinforcing steel bar upsetting cap 2, and the concave grains 11 and the convex grains 12 at the reinforcing steel bar body 1 and the reinforcing steel bar upsetting cap 2 are continuous. The concave grains 11 and the convex grains 12 extend to the top end plane edge of the steel bar heading cap 2, and the top end thereof is parallel to the top end plane. The grooves 11 and the ridges 12 form, at the edges of the top plane, a number of longitudinal grooves 23 which are evenly distributed at the edges of the top plane.

The longitudinal included angle between the concave grains 11 or the convex grains 12 and the straight line where the reinforcing steel bar body 1 is located, namely, the included angle with the axis of the reinforcing steel bar in the vertical direction is alpha, and the alpha is 35-60 degrees. In this embodiment, the number of the concave grains 11 and the number of the convex grains 12 are respectively 6, and the concave grains and the convex grains are uniformly and alternately spirally extended to the top end plane of the steel bar upsetting cap 2.

In the preferred embodiment, a sealing device is arranged on the outer side of the steel bar upsetting cap 2, and the sealing device comprises a non-metallic material capable of withstanding at least 60 ℃. Can prevent on the one hand that the corrosion that reinforcing bar heading cap 2 and external environment contact lead to from damaging, on the other hand can bear high temperature, prevents to take place to damage in the production process to reinforcing leakproofness.

The reinforcing bar heading cap 2 of this embodiment through set up boss 21 and hoop recess 22 on its top, when making the reinforcing bar tip receive external load and assault, can offset partly impact force earlier, avoids the reinforcing bar to upset the head impaired to influence prestressed reinforcement's quality. When the reinforcing steel bar is used in the precast pile without the end plate, the reinforcing steel bar can be combined with the sleeve for use, so that the stress transmission of the upper pile and the lower pile is facilitated after the upper pile is connected. Through set up vertical recess 23 on the top, strengthened the occlusal force of reinforcing bar with the end plate when making the steel reinforcement cage, effectively prevent that the rod iron from taking place the rotation when making the steel reinforcement cage. Through the main part with reinforcing bar upset cap 2 set up to go up convex part 24 and lower concave part 25, effectively reduced the reinforcing bar in the tensioning process, the stress concentration phenomenon that the upset cap produced has effectively avoided the destruction of upset cap to appear and has connect the department deformation at upset cap and muscle body, has promoted the tensile properties of reinforcing bar.

Example 2

As shown in fig. 6-8, this embodiment discloses a prestressed reinforcement, including the reinforcing bar body 1 and the reinforcing bar upsetting cap 2 of setting in reinforcing bar body 1 one end, the whole circular that is planar in top of reinforcing bar upsetting cap 2 is equipped with round platform shape's boss 21 in the top plane central position of reinforcing bar upsetting cap 2, is equipped with circumferential groove 22 in the top plane of reinforcing bar upsetting cap 2, the outer lane of boss 21, is equipped with longitudinal groove 23 at the planar edge in top.

The main body portion of the reinforcing bar heading cap 2, i.e., below the plane of the top end, includes an upper protrusion 24 and a lower protrusion 25, the upper protrusion 24 is connected at one end to the plane of the top surface and at the other end to the top of the lower recess 25, and the plane where the upper protrusion 24 and the lower recess 25 contact is at the maximum dimension of the reinforcing bar heading cap 2, which is shown in a front view as the maximum dimension line of the reinforcing bar (shown as a dotted line in fig. 6). Upper projection 24 extends from the edge of the top end plane to the maximum dimension line, and upper projection 24 is generally downwardly arcuate in curvature in the front view direction. The lower recess 25 extends from the end edge of the reinforcing bar body 1 to the maximum dimension line, the lower recess 25 is integrally curved upward in the front view direction, and the lower recess 25 is gently connected to the end edge of the reinforcing bar body 1. In the present embodiment, the height ratio of the upper convex portion 24 to the lower concave portion 25 is 1/8-1/2. By the size distribution of the upper convex part 24 and the lower concave part 25, the stress born by the steel bar heading can be improved, and the damage in the maximum stress area can be prevented.

In this embodiment, the truncated cone-shaped boss 21 has a narrow top and a wide bottom, and has a height of 0.1mm to 10mm, a maximum outer diameter (i.e., the diameter of the bottom surface of the boss 21) of 6.5mm to 14mm, and a minimum outer diameter (i.e., the diameter of the top surface of the boss 21) of 4.5mm to 12.6 mm. The circumferential groove 22 surrounds the boss 21, and is in a state of sinking to the plane of the top end of the steel bar upsetting cap 2, the distance between the outer edge of the boss 21 and the circumferential groove 22 is 3 mm-10 mm, and the distance here refers to the distance between the edge of the boss 21 and the edge of the circumferential groove 22 in the diameter direction of the bottom surface circle of the boss 21 on the plane of the top end. In actual production, the distance is adaptively modified according to the specifications and the sizes of the reinforcing steel bars, the bosses 21, the heading mechanism and the like. The size of each position of the upset head structure of reinforcing bar that this embodiment set up can improve 21 and the intensity of circumferential groove 22 on the one hand, increases the impact force that it can bear, and on the other hand can make things convenient for the preparation, can cooperate the installation well with supporting pile tip anchor plate and use.

The outside of the reinforcing steel bar is also provided with concave grains 11 and convex grains 12, the concave grains 11 and the convex grains 12 are mutually spaced and spirally arranged on the bar body and the reinforcing steel bar upsetting cap 2, and the concave grains 11 and the convex grains 12 at the reinforcing steel bar body 1 and the reinforcing steel bar upsetting cap 2 are continuous. The concave grains 11 and the convex grains 12 extend to the top end plane edge of the steel bar heading cap 2, and the top end thereof is parallel to the top end plane. The grooves 11 and the ridges 12 form, at the edges of the top plane, a number of longitudinal grooves 23 which are evenly distributed in the top plane.

The longitudinal included angle between the concave grains 11 or the convex grains 12 and the straight line where the reinforcing steel bar body 1 is located, namely, the included angle with the axis of the reinforcing steel bar in the vertical direction is alpha, and the alpha is 35-60 degrees. In this embodiment, the number of the concave grains 11 and the number of the convex grains 12 are respectively 6, and the concave grains and the convex grains are uniformly and alternately spirally extended to the top end plane of the steel bar upsetting cap 2.

In the preferred embodiment, a sealing device is arranged on the outer side of the steel bar upsetting cap 2, and the sealing device comprises a non-metallic material capable of withstanding at least 60 ℃. Can prevent on the one hand that the corrosion that reinforcing bar heading cap 2 and external environment contact lead to from damaging, on the other hand can bear high temperature, prevents to take place to damage in the production process to reinforcing leakproofness.

The reinforcing bar heading cap 2 of this embodiment through set up boss 21 and hoop recess 22 on its top, when making the reinforcing bar tip receive external load and assault, can offset partly impact force earlier, avoids the reinforcing bar to upset the head impaired to influence prestressed reinforcement's quality. When the reinforcing steel bar is used in the precast pile without the end plate, the reinforcing steel bar can be combined with the sleeve for use, so that the stress transmission of the upper pile and the lower pile is facilitated after the upper pile is connected. Through set up vertical recess 23 on the top, strengthened the occlusal force of reinforcing bar with the end plate when making the steel reinforcement cage, effectively prevent that the rod iron from taking place the rotation when making the steel reinforcement cage. Through the main part with reinforcing bar upset cap 2 set up to go up convex part 24 and lower concave part 25, effectively reduced the reinforcing bar in the tensioning process, the stress concentration phenomenon that the upset cap produced has effectively avoided the destruction of upset cap to appear and has connect the department deformation at upset cap and muscle body, has promoted the tensile properties of reinforcing bar.

Example 3

As shown in fig. 9 to 11, the present embodiment discloses a prestressed reinforcement, which includes a reinforcement body 1 and reinforcement upsetting caps 2 disposed at two ends of the reinforcement body 1. Taking one of the reinforcing steel bar upsetting caps 2 as an example, the whole top of the reinforcing steel bar upsetting cap 2 is a circular shape with a plane, a boss 21 with a truncated cone shape is arranged at the center of the top plane of the reinforcing steel bar upsetting cap 2, a circumferential groove 22 is arranged on the top plane of the reinforcing steel bar upsetting cap 2 and the outer ring of the boss 21, and a longitudinal groove 23 is arranged on the edge of the top plane.

The main body portion of the reinforcing bar heading cap 2, i.e., below the top end, includes an upper protrusion 24 and a lower recess 25, the upper protrusion 24 is connected at one end to the plane of the top surface and at the other end to the top of the lower recess 25, and the plane where the upper protrusion 24 and the lower recess 25 are in contact is the maximum dimension of the reinforcing bar heading cap 2, which is shown in a front view as the maximum dimension line of the reinforcing bar (shown as a dotted line in fig. 9). Upper projection 24 extends from the edge of the top end plane to the maximum dimension line, and upper projection 24 is generally downwardly arcuate in curvature in the front view direction. The lower recess 25 extends from the end edge of the reinforcing bar body 1 to the maximum dimension line, the lower recess 25 is integrally curved upward in the front view direction, and the lower recess 25 is gently connected to the end edge of the reinforcing bar body 1. In the present embodiment, the height ratio of the upper convex portion 24 to the lower concave portion 25 is 1/8-1/2. By the size distribution of the upper convex part 24 and the lower concave part 25, the stress born by the steel bar heading can be improved, and the damage in the maximum stress area can be prevented.

In this embodiment, the truncated cone-shaped boss 21 has a narrow top and a wide bottom, and has a height of 0.1mm to 10mm, a maximum outer diameter (i.e., the diameter of the bottom surface of the boss 21) of 6.5mm to 14mm, and a minimum outer diameter (i.e., the diameter of the top surface of the boss 21) of 4.5mm to 12.6 mm. The circumferential groove 22 surrounds the boss 21, and is in a state of sinking to the plane of the top end of the steel bar upsetting cap 2, the distance between the outer edge of the boss 21 and the circumferential groove 22 is 3 mm-10 mm, and the distance here refers to the distance between the edge of the boss 21 and the edge of the circumferential groove 22 in the diameter direction of the bottom surface circle of the boss 21 on the plane of the top end. In actual production, the distance is determined according to the specification and the size of the reinforcing steel bars, the bosses 21, the heading mechanism and the like. The size of each position of the upset head structure of reinforcing bar that this embodiment set up can improve 21 and the intensity of circumferential groove 22 on the one hand, increases the impact force that it can bear, and on the other hand can make things convenient for the preparation, can cooperate the installation well with supporting pile tip anchor plate and use.

The outside of the reinforcing steel bar is also provided with concave grains 11 and convex grains 12, the concave grains 11 and the convex grains 12 are mutually spaced and spirally arranged on the bar body and the reinforcing steel bar upsetting cap 2, and the concave grains 11 and the convex grains 12 at the reinforcing steel bar body 1 and the reinforcing steel bar upsetting cap 2 are continuous. The concave grains 11 and the convex grains 12 extend to the top end plane edge of the steel bar heading cap 2, and the top end thereof is parallel to the top end plane. The grooves 11 and the ridges 12 form, at the edges of the top plane, a number of longitudinal grooves 23 which are evenly distributed in the top plane.

The longitudinal included angle between the concave grains 11 or the convex grains 12 and the straight line where the reinforcing steel bar body 1 is located, namely, the included angle with the axis of the reinforcing steel bar in the vertical direction is alpha, and the alpha is 35-60 degrees. In this embodiment, the number of the concave grains 11 and the number of the convex grains 12 are respectively 6, and the concave grains and the convex grains are uniformly and alternately spirally extended to the top end plane of the steel bar upsetting cap 2.

In the preferred embodiment, a sealing device is arranged on the outer side of the steel bar upsetting cap 2, and the sealing device comprises a non-metallic material capable of withstanding at least 60 ℃. Can prevent on the one hand that the corrosion that reinforcing bar heading cap 2 and external environment contact lead to from damaging, on the other hand can bear high temperature, prevents to take place to damage in the production process to reinforcing leakproofness.

The reinforcing bar heading cap 2 of this embodiment through set up boss 21 and hoop recess 22 on its top, when making the reinforcing bar tip receive external load and assault, can offset partly impact force earlier, avoids the reinforcing bar to upset the head impaired to influence prestressed reinforcement's quality. When the reinforcing steel bar is used in the precast pile without the end plate, the reinforcing steel bar can be combined with the sleeve for use, so that the stress transmission of the upper pile and the lower pile is facilitated after the upper pile is connected. Through set up vertical recess 23 on the top, strengthened the occlusal force of reinforcing bar with the end plate when making the steel reinforcement cage, effectively prevent that the rod iron from taking place the rotation when making the steel reinforcement cage. Through the main part with reinforcing bar upset cap 2 set up to go up convex part 24 and lower concave part 25, effectively reduced the reinforcing bar in the tensioning process, the stress concentration phenomenon that the upset cap produced has effectively avoided the destruction of upset cap to appear and has connect the department deformation at upset cap and muscle body, has promoted the tensile properties of reinforcing bar.

Example 4

As shown in fig. 12, the present embodiment discloses a reinforced precast pile, which includes the prestressed reinforcement described in any one of embodiments 1 to 3 (in the drawings, both ends of the prestressed reinforcement are provided with reinforcement upsetting caps 2), and further includes a spiral stirrup 3, concrete 4, a pile hoop 5, and a pile end anchoring plate 6;

the spiral stirrup 3 is arranged on the outer side of the plurality of prestressed reinforcements to form a reinforcement cage, and the concrete 4 wraps the prestressed reinforcements and the spiral stirrup 3 to form a pile body. The pile-end anchoring plates 6 are arranged at two ends of the precast pile, and the pile hoops 5 are respectively connected with the concrete 4 and the pile-end anchoring plates 6; the pile end anchoring plate 6 is provided with a tensioning screw hole 61 and a steel bar anchoring hole 62, the tensioning screw hole 61 is used for connecting a tensioning bolt, and the steel bar upsetting cap 2 is arranged in the steel bar anchoring hole 62; the thickness of the pile end anchoring plate 6 is larger than that of the steel bar upsetting cap 2; the inside of the pile cuff 5 is provided with metal indentations 51. The tension screw holes 61 and the reinforcing bar anchoring holes 62 are separated from each other and penetrate the pile-end anchoring plate 6.

In this embodiment, set up groove or muscle groove on giving up reinforcing bar anchor plate in the past, promoted the area of contact of reinforcing bar upset head with the anchor plate to effectively promote the anchoring performance of reinforcing bar and anchor plate. The metal indentation 51 is arranged on the inner side of the pile sleeve 5, so that the bonding performance of the pile sleeve 5 and the pile body concrete 4 is effectively improved. The mechanical connection of the steel bars and the anchoring plates is realized through the structures such as the steel bar anchoring plates and the steel bars, and the steel bar anchoring device has the characteristics of simple structure, high resistance to pulling and horizontal bearing capacity, excellent performance of the steel bar anchoring plates at two ends of the pile, low manufacturing cost, high construction efficiency and the like.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims (13)

1. A prestressed reinforcement characterized by: including the reinforcing bar body and set up the reinforcing bar at reinforcing bar one end at least and upset the cap, the top that the reinforcing bar was upset the cap is equipped with boss and hoop recess, and the top edge that the reinforcing bar was upset the cap is equipped with vertical recess, and the main part that the reinforcing bar was upset the cap still includes convex part and lower concave part, and the upper end of lower concave part links to each other with last convex part, and the lower extreme links to each other with the reinforcing bar body, goes up convex part and lower concave part contact department and is the maximum dimension department that the cap was upset to the reinforcing bar.

2. The prestressed reinforcement of claim 1, wherein: the reinforcing steel bar body is provided with concave lines and convex lines which are arranged at intervals.

3. The prestressed reinforcement of claim 2, wherein: the concave lines and the convex line spiral are arranged on the reinforcing steel bar body and extend to the top of the reinforcing steel bar upsetting cap.

4. The prestressed reinforcement of claim 2, wherein: the longitudinal included angle alpha between the concave lines or the convex lines and the straight line of the reinforcing steel bar body is 35-60 degrees.

5. The prestressed reinforcement of claim 1, wherein: the height ratio of the upper convex part to the lower concave part is 1/8-1/2.

6. The prestressed reinforcement of claim 1, wherein: the boss is cylindrical, the height of the boss is 0.1 mm-10 mm, and the outer diameter of the boss is 6.5 mm-14 mm.

7. The prestressed reinforcement of claim 1, wherein: the boss is in a round table shape, the height of the boss is 0.1 mm-10 mm, the maximum outer diameter of the boss is 6.5 mm-14 mm, and the minimum outer diameter of the boss is 4.5 mm-12.6 mm.

8. The prestressed reinforcement of claim 1, wherein: the distance between the outer edge of the boss and the circumferential groove is 3-10 mm.

9. The prestressed reinforcement of claim 1, wherein: the outside of the steel bar upsetting cap is provided with a sealing device which comprises a non-metallic material capable of bearing at least 60 degrees of temperature.

10. An enhancement mode precast pile which characterized in that: comprising the prestressed reinforcement of any one of claims 1 to 9, further comprising a screw stirrup, concrete, pile ferrule and pile end anchor plate;

the spiral stirrups are arranged at the outer sides of the plurality of prestressed reinforcements, concrete wraps the prestressed reinforcements and the spiral stirrups, the pile end anchoring plates are arranged at two ends of the precast pile, and the pile hoops are respectively connected with the concrete and the pile end anchoring plates; the pile end anchoring plate is provided with a tensioning screw hole and a steel bar anchoring hole, and the steel bar upsetting cap is arranged in the steel bar anchoring hole.

11. The reinforced precast pile of claim 10, wherein: the thickness of the pile end anchoring plate is larger than that of the steel bar upsetting cap.

12. The reinforced precast pile of claim 10, wherein: and metal indentations are arranged on the inner side of the pile hoop.

13. The reinforced precast pile of claim 10, wherein: the tensioning screw hole and the reinforcing steel bar anchoring hole are separated from each other.

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