A pre-entrenched prestressed electric pole production tensioning tool and tensioning process

Abstract

The present invention belongs to the technical field of electric poles, specifically a pre-upsetting type prestressed electric pole production tensioning tool and tensioning process. The tensioning tool includes a tensioning head, which is arranged at the tip of the electric pole. The tensioning head includes a tensioning part and a screw part; wherein, a first steel bar hole is opened in the tensioning part, and a sheath positioning groove is opened at the first steel bar hole of the tensioning part; a matching locking nut is sleeved on the screw part; a tensioning disk, which is arranged at the root end of the electric pole, a second steel bar hole is opened on the tensioning disk, and a sheath positioning groove is opened at the second steel bar hole of the tensioning disk; a sheath, which is installed at the sheath positioning grooves of the tensioning head and the tensioning disk. Compared with the existing technology, the tensioning tool has a simple structure and a low production cost; at the same time, it is conducive to realizing the automation of the steel bar fixed length cutting, upsetting, reinforcing bar threading, steel cage forming, and tensioning process, reducing the labor intensity of employees and improving work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of electric poles, and in particular relates to a pre-upsetting type prestressed electric pole production tensioning tool and a tensioning process. Background Art

[0002] Concrete poles, the primary carrier for power transmission, are widely used in China. They are primarily categorized into three types: prestressed concrete poles, partially prestressed concrete poles, and reinforced concrete poles. Prestressed and partially prestressed concrete poles require prestressing of the steel bars during production. While reinforced concrete poles do not require prestressing during production, their use is being gradually reduced due to national initiatives promoting energy conservation and carbon reduction.

[0003] Due to the limitations of tensioning tools, the current traditional steel bar tensioning process is: cutting steel bars to a fixed length - passing the steel bars through the tensioning tools at both ends according to the designed quantity and position (the tensioning tool used at the top end of the pole is called a "tensioning head", and the tensioning tool used at the root end is called a "tensioning disk") - steel bar upsetting - adjusting the position of the tensioning head and tensioning disk - tensioning. During this process, the steel bars need to be passed through the tensioning tool first. The tensioning tool needs to be moved a certain distance to the middle of the steel bars before the steel bars can be fixed on the clamp of the upsetting equipment. The tensioning tool needs to be rotated to allow each steel bar to be upset. After each steel bar is upset, the tensioning tool is adjusted back to its original position. The same operation is performed on both ends of the steel bar. The process is complicated and needs to be completed manually. The tensioning tool is relatively heavy, and the labor intensity of employees is high, which is not conducive to automation. The traditional process usually uses cold upsetting, which is prone to quality problems such as stress concentration in the upsetting head and cracking of the upsetting head. It is also easy for the steel bar to be twisted and unable to be tensioned due to passing through the wrong hole of the tensioning tool. This not only wastes materials but also affects production efficiency.

[0004] Based on this, it is urgent to research and develop a new type of pre-upsetting prestressed pole production tensioning tooling and tensioning process to overcome the above defects. Summary of the Invention

[0005] The first purpose of the present invention is to provide a pre-upsetting prestressed electric pole production tensioning tool, which has a simple structure and low production cost. At the same time, it is conducive to the automation of the steel bar fixed length cutting, upsetting, reinforcing bar threading, steel bar cage forming, and tensioning process, thereby reducing the labor intensity of employees and improving work efficiency.

[0006] The present invention adopts the following technical solution: a pre-upsetting prestressed electric pole production tensioning tool, which includes:

[0007] A tensioning head is provided at the tip of the electric pole, and comprises a tensioning portion and a screw portion; wherein a first steel bar hole is provided in the tensioning portion, and a sheath positioning groove is provided at the first steel bar hole in the tensioning portion; and a matching locking nut is sleeved on the screw portion;

[0008] A tensioning disk is provided at the root end of the electric pole, a second steel bar hole is provided on the tensioning disk, and a sheath positioning groove is provided at the second steel bar hole of the tensioning disk;

[0009] The sheath is installed at the sheath positioning grooves of the tensioning head and the tensioning disk.

[0010] Furthermore, the first reinforcement hole includes a first main reinforcement hole in the form of an elongated strip, and a first through-rebar hole arranged beside the first main reinforcement hole, and the first through-rebar hole is connected to the first main reinforcement hole.

[0011] Furthermore, the second reinforcement hole includes a second main reinforcement hole in the form of an elongated strip, and a second through-rebar hole arranged beside the second main reinforcement hole, and the second through-rebar hole is connected to the second main reinforcement hole.

[0012] Furthermore, the diameters of the first and second reinforcement holes are 1.5 to 2.5 times the diameter of the steel bar; and the diameters of the first and second reinforcement holes are larger than the diameter of the steel bar heading.

[0013] Furthermore, a disc removal slot is provided on a side of the tensioning disc opposite to the tensioning head.

[0014] Furthermore, the disc taking slot is wedge-shaped.

[0015] Furthermore, the sheath includes a main body and a leak-blocking portion provided at the bottom of the main body;

[0016] Wherein, a through hole opposite to the first main reinforcement hole or the second main reinforcement hole is opened on the main body, and the leak-proof part is inserted into the first reinforcement hole of the tensioning head and the second reinforcement hole of the tensioning disk.

[0017] Furthermore, the top of the through hole is recessed inwards, forming two upsetting holes arranged side by side;

[0018] And / or a rib-breaking hole is opened on the main body of the sheath, and the opening direction of the rib-breaking hole is perpendicular to the opening direction of the through hole.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The pre-upsetting prestressed pole production tensioning fixture of the present invention is mainly composed of a tensioning head, a tensioning disk, a locking nut, and a sheath. The structure of the tensioning fixture is correspondingly optimized, making it simple and low in production cost. At the same time, the tensioning fixture is conducive to the automation of the steel bar fixed-length cutting, upsetting, reinforcing, steel cage forming, and tensioning process. The process of upsetting the head first and then reinforcing can reduce the labor intensity of employees and improve work efficiency. In addition, since the contact surfaces of the sheath and the tensioning head and tensioning disk are all flat, the sheath is easily displaced during the tensioning process, resulting in uneven steel bars. To address this problem, the tensioning fixture of the present invention is provided with sheath positioning grooves at the corresponding positions of the tensioning head and tensioning disk to prevent the sheath from shifting during the tensioning process.

[0021] 2) The tensioning head is designed with the first main reinforcement hole in accordance with the pole reinforcement requirements. The first main reinforcement hole is designed to be long and strip-shaped, and a first reinforcement hole is set next to the first main reinforcement hole to be connected with the first main reinforcement hole. According to the reinforcement requirements, it can adapt to the production of each group of single steel bars or double steel bars in parallel. When the pole type is switched, there is no need to repeatedly apply for tensioning tooling, which reduces production costs and improves the versatility of the tensioning tooling.

[0022] 3) A disc removal slot is set up. When removing the tensioning disc, the tensioning disc can be easily removed by knocking the iron chisel into the disc removal slot.

[0023] 4) A plugging part matching the diameter of the reinforcement holes on the tensioning head and tensioning disk is set on the sheath. After the plugging part is inserted into the reinforcement holes of the tensioning head and tensioning disk, the reinforcement holes are sealed, and the tensioning force during the tensioning process of the pole will keep the sheath, tensioning head and tensioning disk tightly together to prevent leakage.

[0024] 5) A rebar cutting hole is set on the sheath for oxygen cutting of rebar, so that the rebar can be directly burned through the oxygen cutting gun, which can effectively prevent safety hazards such as being hit or cut by blades caused by breaking the rebar by knocking or cutting, and reduce the risk index.

[0025] The second object of the present invention is to provide a tensioning process for producing a tensioning tool for a pre-upsetting prestressed electric pole, which comprises the following steps:

[0026] S01: Cut the steel bars to a fixed length according to the number of reinforcement bars on the pole;

[0027] S02: Perform upsetting operation on both ends of the steel bar;

[0028] S03: Pass both ends of the steel bar after the upsetting through the tensioning head and the tensioning plate respectively;

[0029] S04: Arrange the erection circle;

[0030] S05: Perform tensioning operation and lock the tension.

[0031] Furthermore, in step S02, a hot upsetting process is used to perform upsetting operations on both ends of the steel bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a schematic diagram of the assembly structure of the tensioning tooling for producing pre-upsetting prestressed electric poles in the present invention;

[0034] Figure 2 for Figure 1 Schematic diagram of the tensioning head structure;

[0035] Figure 3 for Figure 1 Schematic diagram of the middle locking nut structure;

[0036] Figure 4 for Figure 1 Schematic diagram of the tensioning plate structure;

[0037] Figure 5 for Figure 1 Schematic diagram of the middle sheath structure;

[0038] Among them: tensioning head 1, tensioning part 10, screw part 11, first steel bar hole 12, first main bar hole 121, first through-bar hole 122; locking nut 2; sheath positioning groove 3; tensioning disk 4, second steel bar hole 41, second main bar hole 411, second through-bar hole 412, disk removal groove 42, annular boss 43; sheath 5, main body 50, through hole 501, broken bar hole 502, upsetting head hole 503, leak-proof part 51. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] The following is combined with Figure 1 To the attached Figure 5 And specific embodiments discuss the present invention in detail:

[0041] like Figure 1-5As shown, the present invention provides a pre-upsetting type prestressed pole production tensioning tool, which includes:

[0042] The tensioning head 1 is provided at the tip of the pole and comprises a tensioning portion 10 and a screw portion 11. A first steel bar hole 12 is provided on the tensioning portion 10, and a sheath positioning groove 3 is provided at the first steel bar hole 12 of the tensioning portion 10. A matching locking nut 2 is sleeved on the screw portion 11 to achieve locking.

[0043] A tensioning plate 4 is provided at the root end of the pole, a second steel bar hole 41 is provided on the tensioning plate 4, and a sheath positioning groove 3 is provided at the second steel bar hole 41 of the tensioning plate 4;

[0044] The sheath 5 is installed at the sheath positioning groove 3 of the tensioning head 1 and the tensioning disk 4.

[0045] The pre-upsetting prestressed pole production tensioning fixture of the present invention is mainly composed of a tensioning head 1, a tensioning plate 4, a locking nut 2, and a sheath 5. The structure of the tensioning fixture is correspondingly optimized, making it simple and low in production cost. At the same time, the tensioning fixture facilitates the automation of the steel bar fixed-length cutting, upsetting, reinforcing, steel cage forming, and tensioning processes, and adopts a process of upsetting the head first and then reinforcing the steel bars, which reduces the labor intensity of employees and improves work efficiency. In addition, because the contact surfaces of the sheath 5 and the tensioning head 1 and tensioning plate 4 are all flat, the sheath 5 is easily displaced during the tensioning process, resulting in uneven steel bars. To address this problem, the tensioning fixture of the present invention provides sheath positioning grooves 3 at the corresponding positions of the tensioning head 1 and the tensioning plate 4 to prevent the sheath 5 from shifting during the tensioning process.

[0046] Furthermore, the tensioning portion 10 is disc-shaped, the screw portion 11 is columnar, and the screw portion 11 is vertically arranged at the center of the tensioning portion 10. The first steel bar hole 12 includes a first main bar hole 121 in the shape of an elongated strip, and a first through-bar hole 122 arranged next to the first main bar hole 121, and the first through-bar hole 122 is connected to the first main bar hole 121. The tensioning head 1 designs the first main bar hole 121 according to the pole reinforcement requirements, designs the first main bar hole 121 in the shape of an elongated strip, and arranges the first through-bar hole 122 next to the first main bar hole 121, which is connected to the first main bar hole 121. According to the reinforcement requirements, it can adapt to the production of each group of single steel bars or double steel bars in parallel. When the pole type is switched, there is no need to repeatedly apply for tensioning tooling, which reduces production costs and improves the versatility of the tensioning tooling.

[0047] Similarly, the second reinforcement hole 41 can be designed with reference to the first reinforcement hole 12. The specific technical solution is as follows: the second reinforcement hole 41 includes a second elongated main reinforcement hole 411 and a second reinforcement hole 412 located adjacent to the second main reinforcement hole 411, with the second reinforcement hole 412 communicating with the second main reinforcement hole 411. Depending on the reinforcement requirements, the production of poles with single or double reinforcement can be adapted. When switching between pole types, there is no need to re-purchase tensioning tooling, reducing production costs and increasing the versatility of the tensioning tooling.

[0048] Specifically, the rear end of the steel bar swaging head is larger than the diameter of the steel bar, which is not conducive to the steel bar passing through the tensioning tool. To address this problem, the tensioning tool in the present invention is provided with a first reinforcement hole 122 and a second reinforcement hole 412 with a diameter larger than the diameter of the steel bar swaging head next to the first main reinforcement hole 121 of the tensioning head 1 and the second main reinforcement hole 411 of the tensioning plate 4 to ensure that the steel bar passes through the tensioning tool smoothly. The apertures of the first reinforcement hole 122 and the second reinforcement hole 412 are 1.5 to 2.5 times the diameter of the steel bar.

[0049] Furthermore, the sheath positioning groove 3 is elliptical in shape, and the first steel bar hole 12 and the second steel bar hole 41 are located at the center of the sheath positioning groove 3. The sheath 5 is positioned by the sheath positioning groove 3, and is located at the center, so the positioning effect is good.

[0050] Furthermore, a tray removal slot 42 is provided on the side of the tensioning plate 4 opposite the tensioning head 1. This slot 42 is wedge-shaped and approximately 3 to 10 mm deep. To remove the tensioning plate 4, a chisel is inserted into the slot 42 to easily remove it. An annular boss 43 is also formed on the side of the tensioning plate 4 opposite the tensioning head 1 to control the wall thickness.

[0051] Furthermore, the sheath 5 includes a main body 50 and a leak-proof portion 51 disposed at the bottom of the main body 50. A through-hole 501 is provided in the main body 50, corresponding to the first main bar hole 121 or the second main bar hole 411. The leak-proof portion 51 is inserted into the first bar insertion hole 122 of the tensioning head 1 and the second bar insertion hole 412 of the tensioning plate 4. Through-holes 501 are provided in the sheath 5 corresponding to the main bar holes of the tensioning head 1 and the tensioning plate 2. When a rebar is inserted through the through-hole 501 of the sheath 5, the rebar is locked in place because the width of the through-hole 501 is smaller than the diameter of the heading.

[0052] After the first reinforcement hole 122 is opened on the tensioning head 1 and the second reinforcement hole 412 is opened on the tensioning disk 4, slurry is easily leaked from the reinforcement holes during the centrifugal process of the pole. To address this problem, the tensioning tooling of the present invention is equipped with a sheath 5, and a leak-blocking portion 51 matching the diameter of the reinforcement holes on the tensioning head 1 and the tensioning disk 4 is provided on the sheath 5. After the leak-blocking portion 51 is inserted into the reinforcement holes of the tensioning head 1 and the tensioning disk 4, the reinforcement holes are blocked, and the sheath 5, the tensioning head 1 and the tensioning disk 4 are pressed tightly together by the tensioning force during the tensioning process of the pole to prevent leakage.

[0053] At the same time, the top of the through hole 501 is recessed inwards, forming two upsetting holes 503 arranged side by side for limiting the upsetting of the steel bar.

[0054] Traditional tensioning tools use hammering or grinding to break the steel bars during the pole demoulding process, which can easily lead to safety hazards such as being hit or cut by the blades. To address this problem, the tensioning tool of the present invention provides a steel bar breaking hole 502 on the sheath 5, allowing the steel bars to be directly burned through with an oxygen cutting torch, making the operation safe and simple. The specific technical solution is as follows:

[0055] The main body 50 of the sheath 5 is provided with a rebar-breaking hole 502, oriented perpendicularly to the through-hole 501. The rebar-breaking hole 502 is provided in the sheath 5 for oxygen cutting of rebar. Directly burning through the rebar with an oxygen cutting torch effectively prevents safety hazards such as being struck or cut by the blade, thereby reducing the risk of damage. Accordingly, the width of the first and second main rebar holes 121 and 411 is 1 to 1.5 times the rebar diameter, and the diameter of the rebar-breaking hole 502 is approximately 10 to 30 mm.

[0056] Based on the above-mentioned pre-upsetting type prestressed electric pole production tensioning tool, the present invention further provides a tensioning process of the pre-upsetting type prestressed electric pole production tensioning tool, which includes the following steps:

[0057] S01: Cut the steel bars to a fixed length according to the number of reinforcement bars on the pole;

[0058] S02: Perform upsetting operation on both ends of the steel bar;

[0059] S03: Pass both ends of the steel bar after the upsetting through the tensioning head 1 and the tensioning plate 4 respectively;

[0060] S04: Arranging the erection rings to provide support. Specifically, the positions and spacing of the erection rings may be designed by those skilled in the art based on actual conditions and are not specifically limited in the present invention.

[0061] S05: Perform tensioning operation and lock the tension.

[0062] The tensioning process of the present invention uses a pre-heading method, whereby both ends of the fixed-length steel bars are automatically headed, and then assembled and connected to the tensioning tooling, facilitating production automation. Furthermore, in terms of heading, whether cold or hot heading, the steel bars must be passed through the heading equipment's fixed fixtures before being headed using the cold or hot heading process. The existing technology requires the steel bars to be passed through the tensioning tooling first, which is a complex process and increases the labor intensity of workers. This process is different because there is no tensioning tooling to hinder the steel bar heading, making automation easier.

[0063] Specifically, in step S02, a hot forging process is used to perform a forging operation on both ends of the steel bar. Compared with the cold forging process, the forging process eliminates problems such as stress concentration and forging cracking. In addition, the hot forging process has a large diameter and is relatively flat, which is conducive to eliminating the hidden dangers of the steel bar forging being pulled slipped or even pulled off during the tensioning process.

[0064] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A pre-upsetting prestressed pole production tensioning tool, characterized by: It includes: A tensioning head is provided at the tip of the electric pole, and comprises a tensioning portion and a screw portion; wherein a first steel bar hole is provided in the tensioning portion, and a sheath positioning groove is provided at the first steel bar hole of the tensioning portion; a matching locking nut is sleeved on the screw portion; the first steel bar hole comprises a first main bar hole in the form of an elongated strip, and a first through-bar hole provided beside the first main bar hole, and the first through-bar hole is connected to the first main bar hole; A tensioning disk is provided at the root end of the electric pole, a second steel bar hole is provided on the tensioning disk, and a sheath positioning groove is provided at the second steel bar hole of the tensioning disk; the second steel bar hole includes a second main bar hole in the form of an elongated strip, and a second through-bar hole provided beside the second main bar hole, and the second through-bar hole is connected to the second main bar hole; a sheath is installed at the sheath positioning grooves of the tensioning head and the tensioning disk; The sheath includes a main body and a leak-blocking portion arranged at the bottom of the main body; Wherein, a through hole opposite to the first main reinforcement hole or the second main reinforcement hole is opened on the main body, and the leak-proof part is inserted into the first reinforcement hole of the tensioning head and the second reinforcement hole of the tensioning disk; The top of the through hole is recessed inwards, forming two upsetting holes arranged side by side; And / or a rib-breaking hole is opened on the main body of the sheath, and the opening direction of the rib-breaking hole is perpendicular to the opening direction of the through hole.

2. The pre-entry type prestressed pole production tensioning tool according to claim 1 is characterized in that: The diameters of the first and second reinforcement holes are 1.5 to 2.5 times the diameter of the steel bar; and the diameters of the first and second reinforcement holes are larger than the diameter of the steel bar heading.

3. The pre-entry type prestressed pole production tensioning tool according to claim 1, characterized in that: A disc taking slot is provided on a side of the tensioning disc opposite to the tensioning head.

4. The pre-upsetting prestressed pole production tensioning tool according to claim 3 is characterized by: The disc taking slot is wedge-shaped.

5. A tensioning process for the production of tensioning tooling for pre-upsetting prestressed electric poles, characterized by: The application of the pre-upsetting prestressed electric pole production tensioning tooling according to any one of claims 1 to 4 comprises the following steps: S01: Cut the steel bars to a fixed length according to the number of reinforcement bars on the pole; S02: Perform upsetting operation on both ends of the steel bar; S03: Pass both ends of the steel bar after the upsetting through the tensioning head and the tensioning plate respectively; S04: Arrange the erection circle; S05: Perform tensioning operation and lock the tension.

6. The tensioning process of the pre-entry type prestressed electric pole production tensioning tool according to claim 5, characterized in that: In step S02, a hot upsetting process is used to perform upsetting operations on both ends of the steel bar.

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