A tensioning device for a ring-shaped concrete pole skeleton

Abstract

The application discloses a kind of ring concrete electric pole skeleton tensioning devices, it is related to ring concrete electric pole production equipment technical field.The device includes tensioning machine, steel mould and tensioning assembly, and tensioning assembly is set between tensioning machine and steel mould.Tensioning disc is provided with mounting disc on the side close to tensioning machine, linkage ring and lock pin are equipped in mounting disc, for fixed reinforcement and transmit tension to linkage ring;Linkage ring side is equipped with top rod and jaw, jaw is inserted into limit slot and linkage ring is locked in initial position, when tension reaches preset threshold, linkage ring is released and impact mounting disc and emit sound;Adjusting assembly is used to set trigger threshold.Tensioning disc is provided with separating block, contact disc and fixed sleeve on the side close to steel mould, fixed sleeve is sleeved on the outside of three for fixed separating block, after tensioning, fixed sleeve is pushed to release separating block, so that tensioning disc and contact disc are left out cutting space.The application can detect concentricity on line during tensioning process, and the quick separation of tensioning disc can be realized.

Description

Technical Field

[0001] This invention relates to the technical field of equipment for producing annular concrete utility poles, specifically to a tensioning device for the skeleton of annular concrete utility poles. Background Technology

[0002] Circular concrete poles are widely used components in the construction of power transmission and distribution lines and communication infrastructure. During their production, prestress is applied to the steel reinforcement cage through a tensioning device to improve the pole's load-bearing capacity and crack resistance.

[0003] Existing tensioning devices for ring-shaped concrete utility pole frames typically include a tensioning machine, a steel mold, and tensioning plates at both ends of the steel mold. During production, the reinforcing bar frame is placed inside the steel mold, and the ends of the reinforcing bars are passed through the through holes on the tensioning plates and then upset. The tensioning machine applies prestress by pulling the reinforcing bars through the tensioning plates. Once the tension reaches the design requirements, the bars are anchored and locked, followed by concrete pouring, centrifugal molding, and steam curing.

[0004] However, existing tensioning devices still have the following shortcomings in practical use: The tensioning process lacks methods for detecting concentricity. The concentricity between the tensioning plate and the reinforcing cage is a critical factor affecting product quality. If the tensioning plate and the reinforcing cage are not concentric, uneven stress will occur on the reinforcing bars, leading to bending deformation of the pole after tensioning, and even concrete cracking, severely impacting the pole's load-bearing capacity and durability. In existing technologies, concentricity detection mainly relies on manual alignment or sensor detection. The former has low accuracy and depends on operator experience, while the latter is costly and unreliable in the dusty environment of a cement workshop. While existing patents propose a scheme to monitor the stress on each reinforcing bar using stress sensor assemblies, this scheme relies on electronic components and cannot intuitively and quickly determine concentricity during tensioning. Furthermore, some literature describes technical approaches to improve the controllability of tensioning force through modifications to the tensioning machine, but these do not address the issue of online concentricity detection during the tensioning process.

[0005] After tensioning is completed, the tensioning plate is difficult to disassemble. After tensioning is completed, the tensioning plate needs to be removed from the end of the pole for reuse. Since the ends of the prestressed steel bars are anchored to the tensioning plate via upset heads, the steel bars must be cut before the tensioning plate can be removed.

[0006] The existing disassembly process has the following drawbacks: The operating space is limited. The reinforcing bars are located in the gap between the tensioning plate and the end face of the pole, making it difficult to insert cutting tools. Leaving enough space for cutting would result in further waste of reinforcing bars.

[0007] The tooling is easily damaged. Currently, the main method is to manually cut the steel bars connecting the pole and the tensioning plate one by one using gas welding. However, due to the difficulty in precisely controlling the cutting thickness with gas welding, coupled with the confined space, the tensioning plate is easily damaged.

[0008] There are significant safety hazards. Manually performing gas welding in a confined space poses a risk of burns and scalds, and the ejection of the steel bar tip during the cutting process also poses a risk of injury.

[0009] It requires two cuts, resulting in material waste. The first cut is made on the tensioning plate, and after demolding, the exposed rebar ends on the pole end face need to be cut a second time. The current method results in more than 60 mm of rebar being discarded at each end.

[0010] Tensioning discs are difficult to clean and have high maintenance costs. Concrete adheres to the surface of the tensioning disc during tensioning and pouring, requiring manual cleaning; once the tensioning disc is worn, it needs to be replaced entirely, which is very costly.

[0011] To address the aforementioned issues, some patents have proposed improvement solutions. For example, existing patents have designed a tensioning device with stepped through holes and bolt limiting, which uses a square hole structure and internal hexagonal bolts to achieve sliding limiting of the tensioning components, making tension release and rebar cutting operations more convenient; another patent proposes a combined design that separates the tensioning head and anchor plate, so as to replace the easily damaged anchor plate; and yet another patent has developed an automatic rebar cutting and disassembly device, which uses plasma cutting and laser sensor positioning to achieve automated rebar cutting. Summary of the Invention

[0012] The problem that this invention aims to solve is: ......

[0013] To solve the above-mentioned technical problems, the technical solution of the present invention is: a tensioning device for annular concrete pole skeleton, comprising a tensioning machine, a steel mold and a tensioning assembly, wherein the tensioning assembly is disposed between the tensioning machine and the steel mold.

[0014] Preferably, the tensioning assembly includes a tensioning plate, a chute, separating blocks, a contact plate, a telescopic rod, a fixing sleeve, a mounting plate, mounting blocks, and an adjusting assembly. The tensioning plate is disposed between the tensioning machine and the steel mold. Each component in the tensioning assembly has through holes evenly distributed along its center. The tensioning plate is fixedly connected to the output end of the tensioning machine. A chute is provided on the side of the tensioning plate near the steel mold, and the chute is evenly distributed around the center of the tensioning plate. Four separating blocks are provided on one side of the tensioning plate. The separating blocks are slidably mounted on the chute, and when the separating blocks slide along the chute, their sliding direction is a radial direction perpendicular to the axis of the tensioning plate.

[0015] Preferably, the contact plate is located on the side of the separating block near the steel mold. The contact plate is fixedly connected to the tensioning plate via a telescopic rod, and the contact plate can move along the tensioning direction under the action of the telescopic rod. A sealing gasket is provided on the side of the contact plate near the steel mold to prevent concrete leakage from the contact plate. A fixing sleeve is fitted around the tensioning plate, the separating block, and the contact plate, covering the three components and used to fix the separating block. The sides of the separating block adjacent to the contact plate are both beveled, and the bevels of the two components cooperate with each other.

[0016] Preferably, the tensioning plate has an installation plate on the side near the tensioning machine. The installation plate has several installation slots inside, and a linkage ring is slidably disposed inside each slot. A locking pin is located in the center of each linkage ring, with two locking pins per group, positioned on the outside of each reinforcing bar. The linkage ring is used to cooperate with the locking pins to fix the reinforcing bar. The configuration of the linkage rings is determined according to the number of reinforcing bars: when the number of reinforcing bars is greater than a certain number, each linkage ring is used to fix one to a certain number of reinforcing bars; when the number of reinforcing bars is a certain number or less, each linkage ring fixes one reinforcing bar.

[0017] Preferably, the locking pin is a hollow frustum shape. When the locking pin holds the reinforcing bar, the reinforcing bar is tightly held by the combined action of the frustum structure of the locking pin, friction, the thread on the surface of the reinforcing bar, and the linkage ring, and becomes tighter and tighter under continuous tension.

[0018] Preferably, the linkage ring has an inclined surface on the side near the top rod. A top rod is located on the inclined surface of the linkage ring, and the top rod is slidably connected to the mounting plate. A pawl is rotatably mounted on the side of the top rod near the linkage ring. A limiting groove is provided on the mounting plate to restrict the range of motion of the pawl. In the initial state, the pawl engages with the limiting groove, locking the linkage ring in its initial position. When the tension on the linkage ring reaches a preset threshold, the pawl disengages from the limiting groove, releasing the linkage ring.

[0019] Preferably, mounting blocks are arranged around the mounting plate, and the mounting blocks are fixed by the tensioning plate and the mounting plate. Several adjusting components are arranged inside the mounting blocks, and each adjusting component controls one of the top rods on the side away from the linkage ring. Each adjusting component includes a spring, a screw, and a knob. The spring is located on the side of the top rod away from the linkage ring, and the screw is located at the end of the spring away from the top rod. The screw engages with the mounting block and is hollow. The knob is rotatably mounted on the mounting block, and the screw is sleeved on the outside of the knob. When the knob is rotated, the screw moves axially, changing the pre-compression of the spring, thereby adjusting the trigger threshold. The surface of the mounting block, around the knob, has scale markings to indicate the currently set threshold.

[0020] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) This invention, by setting a linkage ring, locking pin, top rod, claw, and adjustment component in the mounting plate, can complete the concentricity detection during the tensioning process. When the tension force reaches the preset threshold, each linkage ring is triggered simultaneously or sequentially and emits a "click" sound. The operator can judge whether the tensioning plate and the steel cage are concentric by listening to the uniformity of the sound. At the same time, the direction of deviation can be roughly judged by the direction of the sound source. No additional procedures are required, no extra time is taken up, the judgment is intuitive, and the operation threshold is low. The entire detection mechanism adopts a pure mechanical structure, without any electronic components, sensors, or power supply. It is not afraid of dust pollution and is suitable for harsh production environments such as cement workshops with high temperature, high humidity, and high dust. It has high reliability, low failure rate, and long service life. By rotating the knob to drive the screw to move, the pre-compression of the spring can be changed. The trigger threshold can be continuously adjusted within the range of 15% to 35% of the formal tension force to adapt to the tensioning requirements of different specifications of poles and different strength grades of steel bars. It can also compensate for the fatigue and elasticity decay of the spring after long-term use. The scale markings around the knob are convenient for operators to set in a standardized manner. When the scrap steel bar is pulled out, the linkage ring is pushed back to the initial position. The pawl is guided by the limit groove to rotate downward and collapse first. After the linkage ring is fully reset, it pops out again and locks under the action of the spring. The whole process is completed automatically without any additional manual operation. (2) This invention achieves rapid separation of the tensioning plate end through the cooperation of the separating blocks, contact plate, and fixed sleeve. After release, only the fixed sleeve needs to be pushed along the tensioning direction, and the four separating blocks will automatically detach radially along the slide under the combined action of the inclined plane and the remaining tension force. Subsequently, the contact plate moves along the tensioning direction under the guidance of the telescopic rod, creating sufficient cutting space between the tensioning plate and the contact plate. Workers can directly cut the exposed steel bars in the open space, completely eliminating the limitation of operating in narrow gaps. At the same time, since the main body of the tensioning plate has been removed during cutting, accidental damage to the tensioning plate is completely avoided, significantly extending the service life of the tensioning plate. Since the cutting is carried out in the open space, the cutting position can be precisely controlled, and the steel bar can be cut in one cut, effectively reducing the waste of steel bar materials. The entire operation does not require gas welding in a narrow space, avoiding the risk of burns and scalds. There is no need to knock or pry the tensioning plate, reducing labor intensity and ensuring work safety. Because the separating block and contact plate are located on the side of the tensioning plate closest to the steel mold, the main body of the tensioning plate does not directly contact the concrete and requires no cleaning. Concrete contamination is mainly concentrated on the separating block and contact plate, requiring only the cleaning of these two small modules. Easily damaged parts such as the separating block and locking pins can be replaced independently, eliminating the need to replace the entire tensioning plate, thus significantly reducing maintenance costs. The fixing sleeve is always located around the tensioning plate and moves with it, requiring no separate disassembly or management. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall (without steel mold) structure of the present invention; Figure 3 This is a schematic diagram of the tensioning component structure of the present invention; Figure 4 This is a schematic cross-sectional view of the tensioning disc of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a partial cross-sectional view of the mounting disk of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is an exploded view of the tensioning component of the present invention.

[0022] In the diagram: 1. Tensioning machine; 2. Steel mold; 3. Tensioning assembly; 301. Tensioning plate; 302. Slide groove; 303. Separating block; 304. Contact plate; 305. Telescopic rod; 306. Fixing sleeve; 307. Mounting plate; 3071. Mounting groove; 3072. Linkage ring; 3073. Locking pin; 3074. Top rod; 3075. Claw; 3076. Limiting groove; 308. Mounting block; 309. Adjusting assembly; 3091. Spring; 3092. Screw; 3093. Knob; 4. Through hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0024] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0025] like Figures 1 to 7 As shown, the present invention provides a tensioning device for annular concrete utility pole frame, including a tensioning machine 1, a steel mold 2, and a tensioning assembly 3, wherein the tensioning assembly 3 is disposed between the tensioning machine 1 and the steel mold 2.

[0026] The tensioning assembly 3 includes a tensioning plate 301, a slide groove 302, a separating block 303, a contact plate 304, a telescopic rod 305, a fixing sleeve 306, a mounting plate 307, a mounting block 308, and an adjusting assembly 309. The tensioning plate 301 is disposed between the tensioning machine 1 and the steel mold 2. All components in the tensioning assembly 3 have through holes 4 evenly distributed around the center. The tensioning plate 301 is fixedly connected to the output end of the tensioning machine 1. A slide groove 302 is provided on the side of the tensioning plate 301 near the steel mold 2. The slide groove 302 is evenly distributed around the center of the tensioning plate 301. Four separating blocks 303 are provided on one side of the tensioning plate 301. The separating blocks 303 are slidably mounted on the slide groove 302. When the separating blocks 303 slide along the slide groove 302, their sliding direction is radially perpendicular to the tensioning plate 301.

[0027] The contact plate 304 is located on one side of the separation block 303, close to the steel mold 2. The contact plate 304 is fixedly connected to the tensioning plate 301 through the telescopic rod 305. The contact plate 304 can move along the tensioning direction under the action of the telescopic rod 305. A sealing gasket is provided on one side of the contact plate 304 to prevent concrete from leaking from the contact plate 304.

[0028] A fixing sleeve 306 is fitted around the tensioning plate 301, the separating block 303 and the contact plate 304. The fixing sleeve 306 can cover the above three components and is used to fix the separating block 303.

[0029] The side of the separator 303 adjacent to the contact plate 304 is both opened as a slope.

[0030] A mounting plate 307 is provided on the side of the tensioning plate 301 near the tensioning machine 1. Several mounting grooves 3071 are opened in the middle of the mounting plate 307. A linkage ring 3072 is slidably arranged inside the mounting groove 3071. A locking pin 3073 is provided in the middle of the linkage ring 3072. Two locking pins 3073 are grouped together. The locking pins 3073 are located on the outside of each steel bar. The linkage ring 3072 is used to fix the steel bar in conjunction with the locking pins 3073. The design of the linkage ring 3072 is different from the number of steel bars. When there are more than 8 steel bars, the linkage ring 3072 is used to fix 2-4 steel bars. When there are 8 or less steel bars, the linkage ring 3072 controls 8 steel bars respectively.

[0031] The locking pin 3073 is designed as a hollow frustum. When the locking pin 3073 holds the reinforcing bar, the shape of the locking pin 3073, the friction, the threads on the surface of the reinforcing bar, and the action of the linkage ring tightly hold the reinforcing bar, and it becomes tighter and tighter under continuous tension.

[0032] Two inclined surfaces are provided on one side of the linkage ring 3072. A push rod 3074 is provided on one side of the inclined surface of the linkage ring 3072. The push rod 3074 is slidably connected to the mounting plate 307. A pawl 3075 is rotatably provided on the side of the push rod 3074 near the linkage ring 3072. A limit groove 3076 is provided at the pawl 3075 through the mounting plate 307. The limit groove 3076 is used to limit the range of motion of the pawl 3075.

[0033] Mounting blocks 308 are provided around the mounting plate 307. The mounting blocks 308 can be fixed by the tensioning plate 301 and the mounting plate 307. Several adjusting components 309 are provided inside the mounting blocks 308. The adjusting components 309 are located on one side of the top rod 3074. Each adjusting component 309 controls one top rod 3074. The adjusting component 309 includes a spring 3091 located on one side of the top rod 3074. The other end of the spring 3091 is provided with a screw 3092. The screw 3092 engages with the mounting block 308. The screw 3092 is hollow and is sleeved on the outside of the knob 3093. The knob 3093 is rotatably mounted on the mounting block 308. The knob 3093 is surrounded by scale markings on the surface of the mounting block 308.

[0034] Working principle and usage process of this invention: The working principle of this device is as follows: Before tensioning begins, the reinforcing bars are passed through the through-hole 4 and placed in the linkage ring 3072, which extends into the mounting plate 307. Locking pins 3073 are fitted in pairs on the outside of each reinforcing bar. The hollow frustum-shaped inner wall of the locking pin 3073 grips the outer surface of the reinforcing bar. Through the combined action of the frustum-shaped structure of the locking pin 3073, the friction of the inner wall, the threads on the surface of the reinforcing bar, and the inner hole of the linkage ring 3072, the reinforcing bar is firmly fixed. When the tensioning machine 1 applies tension, the reinforcing bar experiences a tensile force in the direction of the tensioning machine 1. This force is transmitted to the linkage ring 3072 through the locking pins 3073, causing the linkage ring 3072 to tend to slide towards the steel mold 2.

[0035] In the initial state, the inclined surface of one side of the linkage ring 3072 abuts against the pawl 3075, locking the linkage ring 3072 in the initial position. As the tension gradually increases and reaches a preset threshold (set by the adjusting component 309), the tension on the linkage ring 3072 pushes the push rod 3074 and the pawl 3075 to move as a whole through its inclined surface. The push rod 3074 overcomes the resistance of the spring 3091 and pushes the push rod 3074 and the pawl 3075 to move outward as a whole, causing the pawl 3075 to disengage from the mounting groove 3071. The linkage ring 3072 is released and slides along the mounting groove 3071 towards the steel mold 2. During the sliding process, the linkage ring 3072 hits the inner wall of the mounting plate 307, making a sound.

[0036] The trigger threshold of each linkage ring 3072 is set by the adjustment component 309. When the knob 3093 is rotated, the screw 3092 moves, changing the pre-compression of the spring 3091, thereby adjusting the trigger resistance of the push rod 3074. The scale markings around the knob 3093 are used to indicate the currently set threshold value.

[0037] When all linkage rings 3072 are triggered simultaneously, a uniform "click" sound is emitted, indicating that the tensioning plate 301 is under uniform stress, and that the tensioning plate 301 is concentric with the steel mold 2 and the steel cage. When each linkage ring 3072 is triggered sequentially, there is a significant time difference in the sound, indicating that the tensioning plate 301 is eccentric and needs to be adjusted.

[0038] After tensioning is completed, release is performed. After release, the fixing sleeve 306 is pushed along the tensioning direction, causing the separating blocks 303 to protrude from the fixing sleeve 306. Under the interaction between the tensioning plate 301 and the contact plate 304, the separating blocks 303 slide outward along the slide groove 302 and disengage from between the tensioning plate 301 and the contact plate 304. After all four separating blocks 303 are removed, the contact plate 304 moves along the tensioning direction under the guidance of the telescopic rod 305, creating a gap between the contact plate 304 and the steel mold 2, providing cutting space for workers to cut the reinforcing bars.

[0039] After cutting, the tensioning plate 301 assembly and the scrap steel bars are removed together. When removing the scrap steel bars, pull them out from the pier head. At this time, the linkage ring 3072 is pushed back to its initial position, and the claw 3075, guided by the limiting groove 3076, first rotates downward and collapses. After the linkage ring 3072 is fully reset, the claw 3075 re-engages and locks, ready for the next use. The sealing gasket prevents concrete slurry from leaking from the contact plate 304 during tensioning and pouring.

[0040] The working process of this device is as follows: Installation and Rebar Insertion: Insert the separating block 303 into the contact plate 304 and tensioning plate 301, then fit the fixing sleeve 306 onto the outside of the three to constrain and fix the separating block 303. Pass the rebar through the rebar insertion hole 4, and the rebar extends into the linkage ring 3072. Locking pins 3073 are fitted in pairs on the outside of each rebar to hold and fix it tightly. Select the configuration of the linkage ring 3072 according to the number of rebars: when the number of rebars is greater than 8, each linkage ring 3072 fixes 2-4 rebars; when the number of rebars is 8 or less, each linkage ring 3072 controls one rebar.

[0041] Threshold adjustment: Rotate knob 3093, screw 3092 moves axially, adjust the pre-compression of spring 3091, and set the trigger threshold.

[0042] Tensioning and Concentricity Testing: Tensioning machine 1 is started, pulling tensioning plate 301. The reinforcing bar transmits tension to linkage ring 3072 via locking pin 3073. When the tension reaches the preset threshold, linkage ring 3072 pushes the top rod 3074 and the claw 3075 through its inclined surface, disengaging from the mounting slot 3071. Linkage ring 3072 is released and strikes the inner wall of mounting plate 307, producing a "click" sound. Operators judge concentricity by listening to the sound: if all linkage rings 3072 trigger simultaneously and the sounds are uniform, the concentricity is qualified, and tools can be used for further measurement. After measurement, tensioning continues to the formal tension force; if the sounds are significantly sequential, there is no concentricity, and the machine needs to be stopped for adjustment.

[0043] Pouring and Curing: After tensioning to the official tension force, concrete is poured. A sealing gasket prevents concrete slurry from leaking through the contact plate at 304. After pouring, centrifugal molding and steam curing are performed.

[0044] Release tension: After the concrete reaches its design strength, the prestress is released.

[0045] Separation and Cutting: Push the fixed sleeve 306 along the tensioning direction to expose the separating block 303 from the fixed sleeve 306. The separating block 303 slides out radially along the slide groove 302. After all four separating blocks 303 are removed, move the contact plate 304 via the telescopic rod 305 to create a gap between the tensioning plate 301 and the contact plate 304, providing cutting space for cutting the exposed reinforcing bars.

[0046] Disassembly and Reset: After cutting, remove the tensioning plate 301 and the scrap steel bars together. When the scrap steel bars are pulled out, the linkage ring 3072 is pushed back to its initial position, and the claw 3075 is re-engaged and locked under the guidance of the limiting groove 3076, ready for the next use.

[0047] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A tensioning device for a ring-shaped concrete utility pole frame, comprising a tensioning machine (1), a steel mold (2), and a tensioning assembly (3), wherein the tensioning assembly (3) is disposed between the tensioning machine (1) and the steel mold (2), characterized in that, The tensioning assembly (3) includes a tensioning plate (301), a separating block (303), a contact plate (304), a telescopic rod (305), a fixing sleeve (306), a mounting plate (307), a linkage ring (3072), a locking pin (3073), a top rod (3074), a claw (3075), and an adjustment assembly (309). The tensioning plate (301) is disposed between the tensioning machine (1) and the steel mold (2). The tensioning plate (301) is fixedly connected to the output end of the tensioning machine (1). The tensioning plate (301) is provided with a through hole (4). The separating block (303) is disposed on the side of the tensioning plate (301) near the steel mold (2), and the contact plate (304) is disposed on the side of the separating block (303) near the steel mold (2). The contact plate (304) is connected to the tensioning plate (301) through the telescopic rod (305). The fixing sleeve (306) is sleeved on the outside of the tensioning plate (301), the separating block (303) and the contact plate (304); The mounting plate (307) is located on the side of the tensioning plate (301) close to the tensioning machine (1), and the mounting plate (307) is provided with a mounting groove (3071). The linkage ring (3072) is slidably disposed in the mounting groove (3071), and the locking pin (3073) is disposed in the middle of the linkage ring (3072). The locking pin (3073) is used to hold and fix the reinforcing bar passing through the through hole (4). The push rod (3074) is disposed on one side of the linkage ring (3072), and the pawl (3075) is rotatably disposed on the end of the push rod (3074) near the linkage ring (3072); The adjustment component (309) is located on the side of the top rod (3074) away from the linkage ring (3072) and is used to set the trigger threshold.

2. The annular concrete pole frame tensioning device according to claim 1, characterized in that: The tensioning plate (301) has a groove (302) on the side near the steel mold (2). The groove (302) is evenly distributed around the center of the tensioning plate (301). The separation block (303) is slidably installed on the groove (302). When the separation block (303) slides along the groove (302), its sliding direction is a radial direction perpendicular to the axis of the tensioning plate (301).

3. The annular concrete pole frame tensioning device according to claim 1, characterized in that: The contact plate (304) can move along the tensioning direction under the action of the telescopic rod (305). A sealing gasket is provided on the side of the contact plate (304) near the steel mold (2) to prevent concrete from leaking from the contact plate (304).

4. The annular concrete pole frame tensioning device according to claim 1, characterized in that: The separating block (303) and the contact plate (304) are both provided with inclined surfaces, and the inclined surfaces of the separating block (303) and the contact plate (304) cooperate with each other.

5. The annular concrete pole frame tensioning device according to claim 1, characterized in that: The linkage ring (3072) is disposed inside the mounting groove (3071), and the locking pins (3073) are disposed in pairs on the outside of each steel bar. The linkage ring (3072) is used to cooperate with the locking pins (3073) to fix the steel bar. When the number of steel bars is greater than 8, each linkage ring (3072) is used to fix 2 to 4 steel bars. When the number of steel bars is 8 or less, each linkage ring (3072) fixes one steel bar.

6. The annular concrete pole frame tensioning device according to claim 1, characterized in that: The locking pin (3073) is set as a hollow frustum shape. Two locking pins (3073) are arranged in a pair facing each other. The inner wall of the locking pin (3073) is used to hold the outer surface of the reinforcing bar. Under the synergistic effect of the frustum structure of the locking pin (3073), the friction of the inner wall, the thread on the surface of the reinforcing bar, and the inner hole of the linkage ring (3072), the reinforcing bar is fixed.

7. The annular concrete pole frame tensioning device according to claim 1, characterized in that: The linkage ring (3072) has an inclined surface on the side near the top rod (3074), and the top rod (3074) is located on the inclined surface of the linkage ring (3072). The top rod (3074) is slidably connected to the mounting plate (307).

8. The annular concrete pole frame tensioning device according to claim 7, characterized in that: The pawl (3075) is rotatably mounted on the top rod (3074) near the linkage ring (3072). A limiting groove (3076) is provided on the mounting plate (307), which is used to limit the range of motion of the pawl (3075). In the initial state, the pawl (3075) is engaged in the limiting groove (3076), locking the linkage ring (3072) in the initial position. When the tension on the linkage ring (3072) reaches the trigger threshold, the pawl (3075) disengages from the limiting groove (3076), releasing the linkage ring (3072).

9. The annular concrete pole frame tensioning device according to claim 1, characterized in that: The mounting plate (307) is surrounded by mounting blocks (308), which are fixed by the tensioning plate (301) and the mounting plate (307). The adjusting component (309) is located inside the mounting block (308) and on the side of the top rod (3074) away from the linkage ring (3072). Each adjusting component (309) controls one top rod (3074).

10. A tensioning device for a ring-shaped concrete utility pole frame according to claim 9, characterized in that: The adjusting assembly (309) includes a spring (3091), a screw (3092), and a knob (3093); the spring (3091) is located on the side of the push rod (3074) away from the linkage ring (3072), the screw (3092) is located at the end of the spring (3091) away from the push rod (3074), the screw (3092) engages with the mounting block (308), and the screw (3092) is hollow; the knob A knob (3093) is rotatably mounted on the mounting block (308), and a screw (3092) is sleeved on the outside of the knob (3093). When the knob (3093) is rotated, the screw (3092) moves axially, changing the pre-compression of the spring (3091), thereby adjusting the size of the trigger threshold. The surface of the mounting block (308) is provided with scale markings around the knob (3093) to indicate the currently set threshold size.

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