CN215441879U - Prestressed reinforcement structure and precast pile - Google Patents
Prestressed reinforcement structure and precast pile Download PDFInfo
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- CN215441879U CN215441879U CN202120740818.2U CN202120740818U CN215441879U CN 215441879 U CN215441879 U CN 215441879U CN 202120740818 U CN202120740818 U CN 202120740818U CN 215441879 U CN215441879 U CN 215441879U
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Abstract
The utility model relates to a prestressed reinforcement structure, which comprises a reinforcement body, wherein a reinforcement upset is arranged at the end part of the reinforcement body, the reinforcement upset is conical, the taper angle theta of the reinforcement upset is 20-180 degrees, the minimum end of the reinforcement upset is connected with the end part of the reinforcement body, the maximum end of the reinforcement upset is positioned at the end part of the reinforcement structure, the axis of the reinforcement upset is superposed with the axis of the reinforcement body, and the height h of the reinforcement upset is 16-42 mm. The application also discloses a precast pile containing the steel bar structure. The utility model provides a steel bar structure is in the stretch-draw process after the reinforcing bar equipment goes into the end plate, and the biggest stress area of reinforcing bar concentrates on the muscle body of reinforcing bar to effectively prevent the stress concentration of upset department and the too big upset that leads to and damage, the upset of reinforcing bar sets up to the toper shape, and is bigger with outside steel part area of contact, thereby improves its lifting surface, promotes the anchoring performance of reinforcing bar. The precast pile of this application has adopted this steel bar structure and other part, has good anchoring performance and stability.
Description
Technical Field
The utility model relates to the field of building engineering materials, in particular to a prestressed reinforcement structure and a 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.
In the technical scheme of the chinese patent CN103290839B entitled "connecting structure of end plate and steel bar of prestressed concrete pipe pile", the prestressed reinforcement adopts a steel bar, the structure of the steel bar head is composed of a small head and a tapered steel bar clamping part, the head structure causes stress concentration to easily occur at the clamping part in the pulling process of the steel bar, which causes necking yielding failure of the head, and the ideal failure mode of the real prestressed reinforcement is failure at the non-head part of the reinforcement, and the head structure combination also requires that the end plate matched with the head structure combination is provided with a step-shaped tapered hole, in order to meet the requirements of the pulling and shearing resistance of the end plate, the material of the end plate needs to be improved or the thickness of the end plate needs to be increased to meet the anchoring requirements of the steel bar and the end plate, thereby avoiding quality problems such as the end plate being pulled through in the pulling process of the steel bar, thereby greatly affecting the quality of the pile, once the end plate of the end is pulled through in the pulling process of the precast pile, leading to significant engineering problems.
SUMMERY OF THE UTILITY MODEL
In order to solve the prior technical problem, the utility model provides a prestressed reinforcement structure and a precast pile.
The utility model specifically comprises the following contents: a prestressed reinforcement structure comprises a reinforcement body, wherein a reinforcement upset is arranged at the end part of the reinforcement body, the reinforcement upset is conical, the cone angle theta of the reinforcement upset is 20-180 degrees, the minimum end of the reinforcement upset is connected with the end part of the reinforcement body, the maximum end of the reinforcement upset is positioned at the end part of the reinforcement structure, the axis of the reinforcement upset coincides with the axis of the reinforcement body, and the height h of the reinforcement upset is 16-42 mm.
Furthermore, a fillet is arranged at the joint of the end part of the steel bar heading and the inclined plane.
Furthermore, the diameter of the maximum end of the steel bar heading is 16-25 mm.
Furthermore, the diameter of the minimum end of the steel bar heading is 7-16 mm.
Further, the ratio of the height h of the steel bar heading to the diameter of the maximum end of the steel bar heading is 1-2.7.
Further, the ratio of the height h of the steel bar upset head to the diameter of the minimum end of the steel bar upset head is 2-6.0.
Furthermore, the outer side surface of the steel bar structure is provided with concave or convex threads.
Furthermore, a sealing device is arranged on the outer side of the steel bar heading.
Further, the sealing means comprises a non-metallic material capable of withstanding a temperature of at least 60 °.
The application also discloses a precast pile, which comprises any one of the prestressed reinforcement structures, a spiral stirrup, concrete, a pile end anchoring plate and a pile hoop;
the spiral stirrups are arranged on the outer sides of the steel bar structures, concrete wraps the spiral stirrups and the steel bar structures, the pile end anchoring plates are arranged at two ends of the precast pile, and the pile hoops are arranged at two ends of the precast pile; the pile end anchoring plate is provided with a tensioning screw hole and a steel bar anchoring hole, the shape of the steel bar anchoring hole is conical, the steel bar heading is arranged in the steel bar anchoring hole, and tensioning threads are arranged in the tensioning screw hole.
Further, the reinforcing steel bar anchoring holes and the tensioning screw holes are separated from each other and penetrate through the pile end anchoring plate.
Furthermore, the diameter of a large opening of the steel bar anchoring hole is larger than the diameter of the largest end of the steel bar upset head, the diameter of a small opening of the steel bar anchoring hole is larger than the diameter of the smallest end of the steel bar upset head, and the height of the steel bar anchoring hole is larger than the height of the steel bar upset head.
Furthermore, the inner side of the pile hoop is provided with a metal indentation, one side of the pile end anchoring plate close to the concrete is provided with a connecting step, and one end of the pile hoop extending out of the concrete is matched with the connecting step.
In the tensioning process after the reinforcing steel bars are assembled into the end plates, the maximum stress area of the reinforcing steel bars is concentrated on the reinforcing steel bar bodies, so that the damage of the upset heads caused by the concentrated and overlarge stress at the upset heads is effectively prevented, and the tensioning effect and the stability of the precast pile structure are improved. The steel bar heading is set to be in a conical shape, and the contact area of the steel bar heading and an external steel part such as a steel bar anchoring hole in the end plate is larger, so that the stress area of the steel bar heading is increased, and the anchoring performance of the steel bar is improved. The precast pile adopts the steel bar structure and other components, and has good anchoring performance and stability.
Drawings
The following further explains embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic view 1 of a reinforcing bar structure of example 1;
fig. 2 is a schematic view 2 of the reinforcing bar structure of embodiment 1;
fig. 3 is a schematic view of a stress test of the steel bar structure of embodiment 1;
fig. 4 is a schematic view of the reinforcing bar structure of embodiment 2;
fig. 5 is a schematic view of the reinforcing bar structure of embodiment 3;
fig. 6 is a schematic view of the reinforcing bar structure of embodiment 4;
fig. 7 is a schematic view of a precast pile of embodiment 5.
Detailed Description
In the description of the present embodiment, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present embodiment and simplifying the description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Example 1
As shown in fig. 1-3, the embodiment discloses a prestressed reinforcement structure, which includes a reinforcement body 1, a steel bar heading 2 is disposed at an end of the reinforcement body 1, the steel bar heading 2 is conical (the top end of the conical shape coincides with the reinforcement body 1, so that the whole body is in a truncated cone shape), and a taper angle θ is 20 ° to 180 °. The smallest end 22 of the upset 2 is connected with the end of the body 1, the smallest end 22 has the same diameter as the body 1, the largest end 21 is at the end of the overall rebar structure, and the axis of the upset 2 coincides with the axis of the body 1. In this embodiment, the whole body of the reinforcing bar body 1 is cylindrical, and tapered steel bar heading 2 is arranged at both ends of the reinforcing bar body 1, and the structure of the reinforcing bar heading 2 and the reinforcing bar body 1 is integrated. The steel bar heading 2 is set to be conical (the actual structure is that the top end of the cone coincides with the steel bar body 1, so the whole shape is large in size and small in size), when the steel bar heading is assembled with the pile-end anchoring plate, the contact area of the side wall of the conical heading and the pile-end anchoring plate is larger, and the anchoring performance between the steel bar heading and the pile-end anchoring plate can be improved. The steel bar heading 2 and the steel bar body 1 are of an integrated structure and can be directly manufactured by adopting a heading machine.
In the preferred embodiment, the diameter of the maximum end 21 of the steel bar heading 2 is 16 mm-25 mm; the diameter of the minimum end 22 is 7 mm-16 mm; the ratio of the height h of the steel bar heading 2 to the diameter of the maximum end 21 is 1: 1; the ratio of the height h of the upset 2 to the diameter of the smallest end 22 of the upset 2 is 2: 1. through the shape and size setting of the steel bar heading 2, the steel bar heading can further increase the contact area of the side wall of the pier head and the pile end anchoring plate when being assembled with the matched pile end anchoring plate.
As shown in fig. 3, a steel bar with a minimum upset end 22 diameter of 10.7mm and an upset height of 16mm is taken as a calculation target, an end plate of a PHC600AB110 tubular pile is taken as an example, 1/14 of end plate arc is taken, a steel bar anchoring hole matched with the shape of the steel bar upset is arranged on the end plate arc, the steel bar upset is arranged in the steel bar anchoring hole, and the center of the steel bar is located on the arc center line of the end plate arc and is 253mm away from the arc center. The end plate thickness was taken to be 18 mm. The tensile force F of a single steel bar is 1420 multiplied by 0.7 multiplied by 90 is 89460N. And respectively calculating the stress characteristics of the steel bar when the theta is at different values.
The stress area of the steel bar is measured, and it can be seen that when theta is increased from 20 degrees to 90 degrees, the stress of the upset head is gradually increased, and the maximum stress area gradually moves from the upset head to the reducing position, so that the theta is set to be 20 degrees to 180 degrees, and the maximum stress area applied to the steel bar upset head can move to the steel bar body. Through the arrangement, in the tensioning process after the reinforcing steel bars are assembled into the end plate, the maximum stress area of the reinforcing steel bars is concentrated on the reinforcing steel bar body, the stress concentration at the upset head and the damage of the upset head caused by overlarge stress concentration are effectively prevented, and therefore the tensioning effect and the stability of the precast pile structure are improved. In addition, the conical shape of the steel bar heading 2 enables the contact area of the steel bar heading with an external steel part such as a steel bar anchoring hole on an end plate to be larger, so that the stress area of the steel bar heading is increased, and the anchoring performance of the steel bar is improved.
Example 2
As shown in fig. 4, the embodiment discloses a prestressed reinforcement structure, which includes a reinforcement body 1, a reinforcement head 2 is disposed at an end of the reinforcement body 1, the reinforcement head 2 is conical, and a cone angle θ is 20 ° to 180 °. The smallest end 22 of the upset 2 is connected with the end of the body 1, the smallest end 22 has the same diameter as the body 1, the largest end 21 is at the end of the overall rebar structure, and the axis of the upset 2 coincides with the axis of the body 1. In this embodiment, the whole body of the reinforcing bar body 1 is cylindrical, and tapered steel bar heading 2 is arranged at both ends of the reinforcing bar body 1, and the structure of the reinforcing bar heading 2 and the reinforcing bar body 1 is integrated. The steel bar heading 2 is set to be conical (the actual structure is that the top end of the cone coincides with the steel bar body 1, so the whole shape is large in size and small in size), when the steel bar heading is assembled with the pile-end anchoring plate, the contact area of the side wall of the conical heading and the pile-end anchoring plate is larger, and the anchoring performance between the steel bar heading and the pile-end anchoring plate can be improved. The steel bar heading 2 and the steel bar body 1 are of an integrated structure and can be directly manufactured by adopting a heading machine.
In the preferred embodiment, the diameter of the maximum end 21 of the steel bar heading 2 is 16 mm-25 mm; the diameter of the minimum end 22 is 7 mm-16 mm; the ratio of the height h of the steel bar heading 2 to the diameter of the maximum end 21 is 1: 1; the ratio of the height h of the upset 2 to the diameter of the smallest end 22 of the upset 2 is 2: 1. Through the shape and size setting of the steel bar heading 2, the steel bar heading can further increase the contact area of the side wall of the pier head and the pile end anchoring plate when being assembled with the matched pile end anchoring plate.
A round corner 23 is provided at the junction of the end of the upset and its chamfer, i.e., at the edge of the maximum end of the upset. Therefore, when the prestressed reinforcement is stressed, the function of buffering deformation can be achieved. The round angle 23 at the position can also be changed into a convex ring, the convex ring is arranged on the upper part of the conical inclined plane and protrudes out of the inclined plane, the top of the convex ring is contacted with the edge of the steel bar upset head, the bottom of the convex ring is connected with the inclined plane, the circle where the maximum size of the middle protruding part is arranged is parallel to the end part of the steel bar upset head, and the effect of buffering deformation can also be achieved.
Example 3
As shown in fig. 5, the embodiment discloses a prestressed reinforcement structure, which includes a reinforcement body 1, a reinforcement head 2 is disposed at an end of the reinforcement body 1, the reinforcement head 2 is conical, and a cone angle θ is 20 ° to 180 °. The smallest end 22 of the upset 2 is connected to the end of the body 1, the largest end 21 is at the end of the overall rebar structure, and the axis of the upset 2 is coincident with the axis of the body 1. In this embodiment, the whole body of the reinforcing bar body 1 is cylindrical, and both ends of the reinforcing bar body 1 are provided with the steel bar upsets 2, and the steel bar upsets 2 and the reinforcing bar body 1 are of an integrated structure. The steel bar heading 2 is set to be conical, when the steel bar heading is assembled with the pile-end anchoring plate, the contact area of the conical heading and the side wall of the pile-end anchoring plate is larger, and the anchoring performance between the steel bar heading and the pile-end anchoring plate can be improved. The steel bar heading 2 and the steel bar body 1 are of an integrated structure and can be directly manufactured by adopting a heading machine.
In the preferred embodiment, the diameter of the maximum end 21 of the steel bar heading 2 is 16 mm-25 mm; the diameter of the minimum end 22 is 7 mm-16 mm; the ratio of the height h of the steel bar heading 2 to the diameter of the maximum end 21 is 2: 1; the ratio of the height h of the upset 2 to the diameter of the smallest end 22 of the upset 2 is 4: 1. Through the shape and size setting of the steel bar heading 2, the steel bar heading can further increase the contact area of the side wall of the pier head and the pile end anchoring plate when being assembled with the matched pile end anchoring plate.
The external surface of the steel bar is also provided with an inward concave or outward convex thread 11, in the embodiment, the concave and convex thread 11 is also arranged, and the thread 11 spirally extends from one end to the other end of the steel bar structure. By adopting the structure, the contact area between the steel bar and the concrete 5 is increased, so that the adhesion performance is increased, and the strength of the precast pile is increased; in actual production, can set up the screw thread earlier to the reinforcing bar, carry out the upset operation to the reinforcing bar that has unsmooth screw thread again, be convenient for like this on the one hand production, on the other hand both can increase the area of contact between the reinforcing bar body 1 and the concrete 5, also can increase the frictional force between reinforcing bar upset 2 and the pile end anchor plate, prevent that the reinforcing bar from taking place to slide.
Example 4
As shown in fig. 6, the embodiment discloses a prestressed reinforcement structure, which includes a reinforcement body 1, a reinforcement head 2 is disposed at an end of the reinforcement body 1, the reinforcement head 2 is conical, and a cone angle θ is 20 ° to 180 °. The smallest end 22 of the upset 2 is connected to the end of the body 1, the largest end 21 is at the end of the overall rebar structure, and the axis of the upset 2 is coincident with the axis of the body 1. In this embodiment, the whole body of the reinforcing bar body 1 is cylindrical, and both ends of the reinforcing bar body 1 are provided with the steel bar upsets 2, and the steel bar upsets 2 and the reinforcing bar body 1 are of an integrated structure. The steel bar heading 2 is set to be conical (the actual structure is that the top end of the cone coincides with the steel bar body 1, so the whole shape is large in size and small in size), when the steel bar heading is assembled with the pile-end anchoring plate, the contact area of the side wall of the conical heading and the pile-end anchoring plate is larger, and the anchoring performance between the steel bar heading and the pile-end anchoring plate can be improved. The steel bar heading 2 and the steel bar body 1 are of an integrated structure and can be directly manufactured by adopting a heading machine.
In the preferred embodiment, the diameter of the maximum end 21 of the steel bar heading 2 is 16 mm-25 mm; the diameter of the minimum end 22 is 7 mm-16 mm; the ratio of the height h of the steel bar heading 2 to the diameter of the maximum end 21 is 2.7: 1; the ratio of the height h of the upset 2 to the diameter of the smallest end 22 of the upset 2 is 6: 1. Through the shape and size setting of the steel bar heading 2, the steel bar heading can further increase the contact area of the side wall of the pier head and the pile end anchoring plate when being assembled with the matched pile end anchoring plate.
And a sealing device 3 is arranged on the outer side of the steel bar heading 2, and the sealing device 3 comprises a non-metallic material capable of bearing the temperature of more than 60 degrees. Set up like this and can avoid reinforcing bar heading 2 and outside air contact to lead to the corrosion and influence precast pile's intensity and stability on the one hand, on the other hand can prevent its damage under the high temperature state in precast pile production process.
Example 5
As shown in fig. 7, this embodiment discloses a precast pile, which includes any one of the steel bar structures of embodiments 1 to 4, and further includes a spiral stirrup 4, concrete 5, a pile-end anchoring plate 6, and a pile collar 7.
Wherein, spiral stirrup 4 encircles and sets up in the outside of prestressed reinforcement structure, and many prestressed reinforcement and a plurality of spiral stirrup 4 constitute the steel reinforcement cage, and the steel reinforcement cage setting is in the pile body of precast pile, and the inside and outside all parcel of steel reinforcement cage is in concrete 5, and the upset head 2 of reinforcing bar at prestressed reinforcement structure both ends stretches out outside concrete 5. Pile end anchoring plates 6 are arranged on the outer sides of two ends of the concrete 5, tensioning screw holes 61 and steel bar anchoring holes 62 which respectively penetrate through the pile end anchoring plates 6 are formed in the pile end anchoring plates 6, tensioning threads are arranged on the inner walls of the tensioning screw holes 61, the steel bar anchoring holes 62 are conical, and steel bar heading heads 2 are positioned in the steel bar anchoring holes 62; the diameter of the large opening of the steel bar anchoring hole 62 is larger than the diameter of the maximum end 21 of the steel bar upset head 2, the diameter of the small opening is larger than the diameter of the minimum end 22 of the steel bar upset head 2, and the height of the small opening is larger than the height of the steel bar upset head 2. Pile hoops 7 are further arranged at the two tail ends of the concrete 5, the pile hoops 7 are annular as a whole, the outer side surfaces of the pile hoops are flush with the periphery of the concrete 5, and the end parts of the tail ends of the pile hoops, which extend out of the concrete 5, are matched with steps on the inner sides of the steel bar anchoring plates, so that the precast pile is cylindrical as a whole.
The tensioning screw hole 61 and the reinforcing steel bar anchoring hole 62 are separated from each other, so that the groove between the tensioning screw hole 61 and the reinforcing steel bar anchoring hole 62 in the prior art is eliminated, the strength of the pile-end anchoring plate 6 and the foundation area of the steel bar heading 2 and the pile-end anchoring plate 6 are improved, the anchoring performance of the reinforcing steel bar and the pile-end anchoring plate 6 is improved, and the stability of the precast pile is improved.
And a metal indentation 71 is also arranged on the inner side of the pile ferrule 7, namely the side contacting with the concrete 5, so that the bonding performance of the pile ferrule 7 and the concrete 5 is effectively improved. The shape of the metal indentation is not limited, and may be provided as a regular polygon or other shapes.
The precast pile of this embodiment through combining prestressed reinforcement structure and other parts together, the reinforcing bar at precast pile both ends has better anchor ability with 6 junctions of stake end anchor plate, and simple structure easily makes, and the cost is low, the efficiency of construction is high, consequently can satisfy economic nature and security needs in the production.
In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the utility model, which can be embodied in many different forms than described herein, and therefore the utility model is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.
Claims (13)
1. A prestressed reinforcement structure characterized in that: the steel bar structure comprises a steel bar body, wherein a steel bar upset head is arranged at the end part of the steel bar body, the steel bar upset head is conical, the cone angle theta of the steel bar upset head is 20-180 degrees, the minimum end of the steel bar upset head is connected with the end part of the steel bar body, the maximum end of the steel bar upset head is positioned at the end part of the steel bar structure, the axis of the steel bar upset head is overlapped with the axis of the steel bar body, and the height h of the steel bar upset head is 16-42 mm.
2. The prestressed reinforcement structure of claim 1, wherein: and a fillet is arranged at the joint of the end part of the steel bar heading and the inclined plane.
3. The prestressed reinforcement structure of claim 1, wherein: the diameter of the largest end of the steel bar heading is 16-25 mm.
4. The prestressed reinforcement structure of claim 1, wherein: the diameter of the minimum end of the steel bar heading is 7-16 mm.
5. The prestressed reinforcement structure of claim 1, wherein: the ratio of the height h of the steel bar heading to the diameter of the maximum end of the steel bar heading is 1-2.7.
6. The prestressed reinforcement structure of claim 1, wherein: the ratio of the height h of the steel bar upset head to the diameter of the minimum end of the steel bar upset head is 2-6.0.
7. The prestressed reinforcement structure of claim 1, wherein: the outer side surface of the steel bar structure is provided with concave or convex threads.
8. The prestressed reinforcement structure of claim 1, wherein: and a sealing device is arranged on the outer side of the steel bar heading.
9. The prestressed reinforcement structure of claim 7, wherein: the sealing means comprises a non-metallic material capable of withstanding a temperature of at least 60 deg..
10. A precast pile is characterized in that: comprising the prestressed reinforcement structure according to any one of claims 1-9, further comprising a screw stirrup, concrete, a pile end anchor plate and a pile hoop;
the spiral stirrups are arranged on the outer sides of the steel bar structures, concrete wraps the spiral stirrups and the steel bar structures, the pile end anchoring plates are arranged at two ends of the precast pile, and the pile hoops are arranged at two ends of the precast pile; the pile end anchoring plate is provided with a tensioning screw hole and a steel bar anchoring hole, the shape of the steel bar anchoring hole is conical, the steel bar heading is arranged in the steel bar anchoring hole, and tensioning threads are arranged in the tensioning screw hole.
11. A precast pile as recited in claim 10, wherein: the reinforcing steel bar anchoring holes and the tensioning screw holes are mutually separated and penetrate through the pile end anchoring plate.
12. A precast pile as recited in claim 10, wherein: the diameter of the large opening of the steel bar anchoring hole is larger than the diameter of the largest end of the steel bar heading, the diameter of the small opening of the steel bar anchoring hole is larger than the diameter of the smallest end of the steel bar heading, and the height of the steel bar anchoring hole is larger than the height of the steel bar heading.
13. A precast pile as recited in claim 10, wherein: the inner side of the pile hoop is provided with a metal indentation, one side of the pile end anchoring plate close to the concrete is provided with a connecting step, and one end of the pile hoop extending out of the concrete is matched with the connecting step.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115749139A (en) * | 2022-12-22 | 2023-03-07 | 贝正南京工程技术有限公司 | Prestressed carbon fiber bar with two-end conical anchoring end and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115749139A (en) * | 2022-12-22 | 2023-03-07 | 贝正南京工程技术有限公司 | Prestressed carbon fiber bar with two-end conical anchoring end and manufacturing method thereof |
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