Prestressed beam and construction method thereof

Abstract

The invention discloses a prestressed beam and a construction method thereof, and relates to the technical field of energy-saving building material production and building construction. Anchoring is conducted, specifically, prestressed tendons penetrate through through holes, and are fixedly connected with wire rod connectors through anchorage devices, so that the prestressed tendons are fixed to the upper portion of a construction pedestal; adjusting: a small transmission wheel, a large transmission wheel, a small gear and a large gear are sequentially driven to rotate by rotating an operation turntable, so that an adjusting screw rod rotates, and the positions of a moving block and a thermosensitive plate are correspondingly adjusted; according to the method, the situation that the structural strength of the prestressed beam is unqualified due to the fact that the unqualified prestressed tendon is used during pouring of the prestressed beam is prevented, the service life of the prestressed beam is prolonged, pouring of the prestressed beam is more comprehensive and efficient, and the construction efficiency is improved. And the requirements of energy-saving building material production are met, and the popularization and utilization rate is better.

Description

Technical Field

[0001] The present invention relates to the technical fields of energy-saving building material production and building construction, and specifically to a prestressed beam and its construction method. Background Technique

[0002] A prestressed beam is a structural member in which prestress is applied in advance in a concrete member, mainly used to improve the crack resistance and load-bearing capacity of the member. Its basic principle is to apply tension to steel bars or steel strands before or after concrete pouring, so that the concrete is in a compressed state before bearing external loads, thereby offsetting part or all of the tensile stress caused by external loads. The construction of prestressed beams is divided into two methods. One is the pretensioned prestressed beam, in which tension is applied to steel bars or steel strands before concrete pouring, and the tension is released after the concrete hardens, so that the concrete is compressed. The other is the post-tensioned prestressed beam. After the concrete is poured and hardened, tension is applied to the steel bars or steel strands through the reserved ducts, and then fixed through anchor devices;

[0003] For an existing Chinese patent with the application number 201010143573.1 for a construction method of a prestressed beam, after the installation of the steel column, the prestressed frame beam is first poured, and after the prestressed tendon is tensioned, the encased concrete of the steel column is then poured. Using the construction method of the prestressed beam provided by the present invention can reduce the influence of lateral restraint on the concrete structure of the prestressed frame beam, improve the effectiveness of establishing prestress, thereby reducing the amount of reinforcement and lowering the cost;

[0004] Secondly, for an existing Chinese patent with the application number 202510253161.X for a prefabrication construction method of a pretensioned prestressed beam, the invention adopts the design of a fixed pretensioning bed and a single-column pedestal column, effectively saving the production site area, making the construction site cleaner and more orderly, and improving the site utilization rate; the integral hydraulic opening and closing mold and the reasonable folded steel strand bending device effectively reduce the workload and operation time of formwork installation and removal construction and prestress construction, improve work efficiency, reduce labor input, greatly improve the industrialization degree of pretensioned prestressed precast beams, and have good economic benefits, scientific and technological benefits and social benefits, and are worthy of popularization and application;

[0005] However, at present, when using tensioning equipment such as jacks to tension and deform prestressed tendons, the control accuracy of the tensioning length distance is not enough, and it is easy to make mistakes in manually determining the position, resulting in over-tensioning or under-tensioning of the prestressed tendons, which has an adverse impact on the structural strength and service life of the constructed prestressed beam. Therefore, the present invention provides a prestressed beam and its construction method to meet people's needs. Summary of the Invention

[0006] The present invention provides a prestressed beam and its construction method, which can effectively solve the problems raised in the above background technique.

[0007] To achieve the above object, the present invention provides the following technical solution: a construction method for a prestressed beam, including a construction pedestal and construction steps;

[0008] One end of the top of the construction pedestal is provided with a pole connector, through holes are equidistantly opened in the middle of the bottom of the pole connector, and a positioning and monitoring mechanism is arranged on one side of the top of the construction pedestal;

[0009] The positioning and monitoring mechanism includes a moving frame;

[0010] A moving frame is placed on one side of the top of the construction pedestal. The middle of the top end of the moving frame is fixedly installed with a guiding frame. One end inside the guiding frame is movably installed with a splicing frame, and the bottom end of the splicing frame is fixedly connected with a diode laser;

[0011] A fixed box is installed at the top end of the moving frame. A large gear is installed inside the fixed box. An installation frame is installed inside the fixed box. A rotating shaft is rotatably installed at the top of the installation frame. A small gear is fixedly installed in the middle of the rotating shaft. One end of the rotating shaft is fixedly connected with a large transmission wheel; A positioning rod is rotatably installed at a position on one side of the installation frame inside the fixed box. A small transmission wheel is fixedly installed in the middle of the positioning rod, and a transmission belt is sleeved between the middle of the large transmission wheel and the small transmission wheel.

[0012] According to the above technical solution, an adjusting screw is rotatably installed in the middle of the guiding frame. A moving block is movably clamped inside the guiding frame. The bottom end of the moving block is fixedly connected with a connecting frame. One end of the bottom of the connecting frame is fixedly installed with a thermal sensitive plate;

[0013] One end of the positioning rod is fixedly connected with an operation turntable. Marking grooves are equidistantly opened on the edge of the surface of the operation turntable. A marking block is fixedly installed at a position corresponding to the operation turntable on the surface of the fixed box. A connecting rod is installed in the middle of the large gear.

[0014] According to the above technical solution, one end of the connecting rod is fixedly connected with a fitting round block. A limiting card slot is opened in the middle of one end of the fitting round block. A support is fixedly installed at a position corresponding to the connecting rod on the surface of the fixed box. One end of the top of the support is fixedly installed with an electromagnetic block. A positioning frame is fixedly installed in the middle of the top of the support. A limiting rod is movably installed in the middle of the positioning frame. One end of the limiting rod is fixedly connected with a metal round block;

[0015] Hydraulic telescopic rods are symmetrically and fixedly installed at both ends of the top of the moving frame. The bottom ends of both hydraulic telescopic rods are fixedly connected with lifting frames. A tensioning device is fixedly installed in the middle of the lifting frame. The end of the tensioning device is fixedly connected with a fitting block.

[0016] According to the above technical solution, the diode laser and the thermal plate are located on the same vertical plane. The adjusting screw rod movably passes through the moving block and the splicing frame. The adjusting screw rod is threadedly connected to the moving block, and the adjusting screw rod is slidably connected to the splicing frame;

[0017] On both sides of the top of the splicing frame and both sides of the moving block, sliders are symmetrically and fixedly connected. On both sides of the inner wall of the guiding frame, chutes are symmetrically opened. The sliders are movably clamped inside the chutes. The moving block, the splicing frame and the guiding frame are all slidably connected through the fitting of the sliders and the chutes.

[0018] According to the above technical solution, the large gear and the small gear are meshed with each other. The connecting rod passes through the middle of the large gear, and the connecting rod is connected to the end of the adjusting screw rod;

[0019] The gear ratio between the large gear and the small gear is 3:1, and the transmission ratio between the large transmission wheel and the small transmission wheel is 3:1;

[0020] The length and width of the cross-section of the limiting rod are equal to the length and width of the limiting card slot, and the positions of the metal round block and the electromagnetic block correspond to each other.

[0021] According to the above technical solution, a force detection mechanism is installed in the middle of one end of the moving frame;

[0022] The force detection mechanism includes a mounting seat;

[0023] In the middle of one end of the moving frame, a mounting seat is fixedly connected. In the middle of the mounting seat, a support frame is fixedly installed. In the middle of the support frame, a winding wheel is rotatably installed. One end of the winding wheel is fixedly connected with a transmission gear. A traction rope is wound around the middle of the winding wheel. At a position on one side of the support frame at the bottom of the mounting seat, a driving motor is fixedly installed. The output shaft of the driving motor is fixedly connected with an incomplete gear. At one end of the bottom of the mounting seat, an extension frame is fixedly connected. At the top of the extension frame, a positioning sleeve is fixedly installed. The end of the traction rope is fixedly connected with a connecting block. The bottom end of the connecting block is fixedly connected with a mounting flat plate. At equal intervals at the bottom end of the mounting flat plate, reinforcing bar diameter detectors are fixedly installed. At equal intervals at one end of the top of the mounting flat plate, alarms are fixedly installed;

[0024] The traction rope movably passes through the middle of the positioning sleeve, and the incomplete gear and the transmission gear are meshed with each other.

[0025] According to the above technical solution, support inclined plates are symmetrically and fixedly connected to both ends of the mounting flat plate. At the bottom ends of both support inclined plates, fixing plates are fixedly connected. Near one end of the construction pedestal in the middle of the fixing plate, guiding rollers are symmetrically installed. At the bottom ends of the fixing plates, moving wheels are symmetrically installed;

[0026] One end of the bottom of the extension frame is fixedly connected with a mounting plate. One end of the mounting plate is rotatably installed with a rotating long rod. A buffer inclined plate is fixedly installed in the middle of the rotating long rod. A buffer spring is fixedly installed in the middle of the top of the mounting plate. A positioning frame is installed at the top of the buffer inclined plate. A friction wheel is installed in the middle of the positioning frame.

[0027] According to the above technical solution, the number of the steel bar diameter detectors, the alarms and the through holes are the same. The signal output end of the steel bar diameter detector is connected to the signal input end of the alarm. The positions of the steel bar diameter detectors correspond to the positions of the through holes one by one.

[0028] The guiding roller is closely attached to the edge of the construction pedestal.

[0029] The top end of the buffer spring is connected to the bottom of the buffer inclined plate. The traction rope is embedded in the middle of the top of the friction wheel.

[0030] According to the above technical solution, the construction steps include the following steps:

[0031] S1. Positioning: Push the moving frame to one side of the construction pedestal so that the splicing frame is closely attached to one end of the top of the pole connector, and the two tensioners descend to one side of the pole connector.

[0032] S2. Anchoring: Pass the prestressed tendon through the through hole, and use the anchor to fixedly connect the prestressed tendon with the pole connector so that it is fixed above the construction pedestal.

[0033] S3. Adjusting: Rotate the operation turntable to drive the small transmission wheel, the large transmission wheel, the small gear and the large gear to rotate in sequence, so that the adjusting screw rotates, and the positions of the moving block and the thermal plate are adjusted accordingly.

[0034] S4. Tensioning: Start the tensioner to push the pole connector forward to tension the prestressed tendon, and use the relative distance change between the thermal plate and the diode laser to judge the elongation of the prestressed tendon.

[0035] S5. Detecting: After the tensioning is completed, use the steel bar diameter detector to detect the diameter of the tensioned prestressed tendon below to judge whether it meets the qualified deformation range.

[0036] S6. Transposition: Use the drive motor to control the winding wheel to rotate, wind up the traction rope, and then pull the mounting flat plate and the steel bar diameter detector to move forward to detect the prestressed tendon multiple times. Remove and replace the prestressed tendon with unqualified diameter change caused by uneven stress.

[0037] According to the above technical solution, a prestressed beam, a beam body constructed according to a construction method of a prestressed beam.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows: The structure of the present invention is scientific and reasonable, and it is safe and convenient to use:

[0039] 1. A positioning and monitoring mechanism is provided. The position of the moving block is adjusted by the adjusting screw rod to change the distance between the thermal plate and the diode laser. The diode laser moves together with the pole connector. The thermal plate monitors the light emitted by the diode laser. Moreover, the moving distance of the diode laser matches the tensioned length of the prestressed steel bar. Thus, the thermal plate can accurately monitor the tensioned length of the prestressed steel bar, control the tensioning more precisely, prevent over-tensioning or under-tensioning of the prestressed steel bar from affecting the service life of the prestressed steel bar, and reduce the cracking probability of the prestressed beam;

[0040] At the same time, the operation turntable is used to rotate the small transmission wheel, so that the rotation angle is transmitted to the large transmission wheel. The large transmission wheel drives the small gear to rotate and mesh with the large gear. There is a diameter difference between the large transmission wheel and the small transmission wheel, and there is a gear ratio between the large gear and the small gear. The angle is amplified by two-stage transmission. Therefore, the staff can control the small rotation of the adjusting screw rod by greatly adjusting the operation turntable, and the rotation operation of the adjusting screw rod is more precise, which gives the staff more space for manual operation, effectively reduces the error rate, and improves the accuracy of the position adjustment of the thermal plate, preventing the deviation of the thermal plate's moving position from resulting in inaccurate subsequent monitoring results.

[0041] 2. The limiting rod is used to limit and fix the fitting round block, improving the stability of the connecting rod and the large gear when they are idle, preventing the adjusting screw rod and the large gear from shaking and shifting, which may lead to mistakes in subsequent position adjustment. At the same time, the electromagnetic block is used to adsorb and fix the metal round block and the limiting rod, making them fixed during the construction process, playing a positioning role. Thus, the fitting round block that returns to its original position can be directly limited later, and the operation is convenient;

[0042] The splicing frame is used to fit the pole connector, so that the diode laser can move forward together with the pole connector. Thus, by monitoring the position of the diode laser, the moving distance of the pole connector can be judged. At the same time, the hydraulic telescopic rod drives the lifting frame to move up and down, facilitating the change of the position of the tensioner, so that it can smoothly push the pole connector to move.

[0043] 3. A force detection mechanism is provided. The diameter of the prestressed steel bar after tensioning can be detected by a steel bar diameter detector to determine whether it is within the qualified range after deformation. At the same time, the driving motor is used to drive the incomplete gear to make it intermittently mesh with the transmission gear, and then the winding wheel rotates intermittently to wind up the traction rope, so that the steel bar diameter detector moves above the tensioned prestressed steel bar, and the steel bar diameter detector stops intermittently for a period of time, so that the diameter of the prestressed steel bar below can be detected in multiple sections and compared with each other, so that the detection data is more accurate;

[0044] And based on the change in diameter deformation, it can be determined whether the prestressed tendons are evenly stressed, so that the staff can replace unqualified prestressed tendons in time to prevent the prestressed tendons from being unevenly stressed, causing some parts of them to be stretched too thin, affecting the structural strength and service life of the prestressed tendons.

[0045] 4. The guide roller is used to cling to the construction platform to guide the travel trajectory of the steel bar diameter detector, preventing the steel bar diameter detector from shifting and skewing during travel, causing it to be unable to align with the corresponding prestressed tendons and affecting normal detection operations. At the same time, the positioning sleeve plays a guiding and stabilizing role for the traction rope, preventing it from skewing and shaking during the winding process, causing unstable movement of the steel bar diameter detector.

[0046] 5. The friction wheel is used to limit the traction rope by friction, and the buffer inclined plate and buffer spring will play a certain role in buffering tension, so that the traction rope is always kept taut. When the winding stops, the traction rope is buffered and supported to prevent the unwound part from still generating a certain pulling force at the moment of stopping, causing it to rush forward. This improves the positioning accuracy of the steel bar diameter detector, and makes the detection more accurate.

[0047] To sum up, by combining the positioning monitoring mechanism with the force detection mechanism, the tensioning distance is first accurately grasped to prevent over-tensioning or under-tensioning, and then the deformation tensioning length of the prestressed tendons is accurately controlled. At the same time, the diameter of the prestressed tendons is detected in multiple sections and multiple times. At the same time, the degree of change in the diameter is used to analyze the uniformity of the force on the prestressed tendons. These are all detection and processing of the tensioning conditions of the prestressed tendons, which can effectively reduce the use of unqualified prestressed tendons, prevent the use of unqualified prestressed tendons during the casting of prestressed beams, resulting in unqualified structural strength of the prestressed beams, and improve the service life of the prestressed beams. The casting of prestressed beams is more comprehensive and efficient, and the requirements for the production of energy-saving building materials are achieved, which are better promoted and used. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0049] In the drawings:

[0050] Figure 1 is the flow chart of the construction method of the present invention;

[0051] Figure 2 is the schematic diagram of the installation structure of the moving frame of the present invention;

[0052] Figure 3 is the schematic diagram of the installation structure of the thermal sensitive plate of the present invention;

[0053] Figure 4 is the schematic diagram of the installation structure of the tensioner of the present invention;

[0054] Figure 5 is the schematic diagram of the installation structure of the large transmission wheel of the present invention;

[0055] Figure 6 is the schematic diagram of the structure of the positioning and monitoring mechanism of the present invention;

[0056] Figure 7 is the schematic diagram of the installation structure of the small gear of the present invention;

[0057] Figure 8 is the schematic diagram of the installation structure of the metal round block of the present invention;

[0058] Figure 9 is the schematic diagram of the structure of the force detection mechanism of the present invention;

[0059] Figure 10 is the schematic diagram of the installation structure of the buffer inclined plate of the present invention;

[0060] The reference numerals in the figure: 1, construction pedestal; 2, pole connector; 3, through hole;

[0061] 4, positioning and monitoring mechanism; 401, moving frame; 402, guiding frame; 403, splicing frame; 404, diode laser; 405, adjusting screw; 406, moving block; 407, connecting frame; 408, thermal sensitive plate; 409, fixed box; 410, large gear; 411, mounting frame; 412, rotating shaft; 413, small gear; 414, large transmission wheel; 415, positioning rod; 416, small transmission wheel; 417, transmission belt; 418, operation turntable; 419, marking groove; 420, alignment block; 421, connecting rod; 422, fitting round block; 423, limit card slot; 424, bracket; 425, electromagnetic block; 426, positioning frame; 427, limit rod; 428, metal round block; 429, hydraulic telescopic rod; 430, lifting frame; 431, tensioner; 432, fitting block;

[0062] 5. Force detection mechanism; 501. Mounting base; 502. Support frame; 503. Winding wheel; 504. Transmission gear; 505. Traction rope; 506. Driving motor; 507. Incomplete gear; 508. Extension frame; 509. Positioning sleeve; 510. Connecting block; 511. Mounting plate; 512. Reinforcing bar diameter detector; 513. Support inclined plate; 514. Fixed plate; 515. Guide roller; 516. Moving wheel; 517. Alarm; 518. Mounting board; 519. Rotating long rod; 520. Buffer inclined plate; 521. Buffer spring; 522. Positioning frame; 523. Friction wheel. Detailed implementation manner

[0063] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0064] Embodiment: As Figure 1 shown, the present invention provides a technical solution, a construction method for a prestressed beam, including the following steps:

[0065] S1. Positioning: Push the moving frame 401 to one side of the construction pedestal 1, so that the splicing frame 403 is close to one end of the top of the pole connector 2, and the two tensioners 431 descend to one side of the pole connector 2;

[0066] S2. Anchoring: Pass the prestressed tendon through the through hole 3, and use the anchor to fixedly connect the prestressed tendon to the pole connector 2, so that it is fixed above the construction pedestal 1;

[0067] S3. Adjusting: Rotate the operation turntable 418 to drive the small transmission wheel 416, large transmission wheel 414, small gear 413 and large gear 410 to rotate in sequence, so that the adjusting screw 405 rotates, and the positions of the moving block 406 and the thermal plate 408 are adjusted accordingly;

[0068] S4. Tensioning: Start the tensioner 431 to push the pole connector 2 forward to tension the prestressed tendon, and use the relative distance change between the thermal plate 408 and the diode laser 404 to judge the elongation of the prestressed tendon;

[0069] S5. Detecting: After the tensioning is completed, use the reinforcing bar diameter detector 512 to detect the diameter of the prestressed tendon after tensioning below, and judge whether it meets the qualified deformation range;

[0070] S6. Transposition: Use the driving motor 506 to control the rotation of the winding wheel 503 to wind the traction rope 505, and then pull the mounting plate 511 and the reinforcing bar diameter detector 512 to move forward to detect the prestressed tendon multiple times, and remove and replace the prestressed tendon with unqualified diameter change caused by uneven stress.

[0071] As Figures 2 - 10 shown, a pole connector 2 is placed at one end of the top of the construction pedestal 1. Through holes 3 are equidistantly opened in the middle of the bottom of the pole connector 2. A positioning and monitoring mechanism 4 is arranged on one side of the top of the construction pedestal 1;

[0072] The positioning and monitoring mechanism 4 includes a moving frame 401;

[0073] A moving frame 401 is placed on one side of the top of the construction pedestal 1. A guiding frame 402 is fixedly installed in the middle of the top end of the moving frame 401. A splicing frame 403 is movably installed at one end inside the guiding frame 402. A diode laser 404 is fixedly connected to the bottom end of the splicing frame 403. An adjusting screw 405 is rotatably installed in the middle of the guiding frame 402. A moving block 406 is movably clamped inside the guiding frame 402. A connecting frame 407 is fixedly connected to the bottom end of the moving block 406. A thermal sensitive plate 408 is fixedly installed at one end of the bottom of the connecting frame 407. The diode laser 404 and the thermal sensitive plate 408 are located on the same vertical plane. The adjusting screw 405 movably penetrates through the moving block 406 and the splicing frame 403. The adjusting screw 405 is threadedly connected with the moving block 406. The adjusting screw 405 is slidably connected with the splicing frame 403. Sliders are symmetrically and fixedly connected to both side parts of the top of the splicing frame 403 and both side parts of the moving block 406. Sliding grooves are symmetrically opened on both side walls inside the guiding frame 402. The sliders are movably clamped inside the sliding grooves. The moving block 406, the splicing frame 403 and the guiding frame 402 are all slidably connected through the fit of the sliders and the sliding grooves;

[0074] At the top of the moving frame 401, a fixed box 409 is fixedly installed at a position on one side of the guiding frame 402. Inside the fixed box 409, a large gear 410 is installed. Inside the fixed box 409, at a position on one side of the large gear 410, a mounting frame 411 is fixedly installed. At the top of the mounting frame 411, a rotating shaft 412 is rotatably installed. In the middle of the rotating shaft 412, a small gear 413 is fixedly installed. At one end of the rotating shaft 412, a large transmission wheel 414 is fixedly connected. Inside the fixed box 409, at a position on one side of the mounting frame 411, a positioning rod 415 is rotatably installed. In the middle of the positioning rod 415, a small transmission wheel 416 is fixedly installed. A transmission belt 417 is sleeved between the middle parts of the large transmission wheel 414 and the small transmission wheel 416. At one end of the positioning rod 415, an operation turntable 418 is fixedly connected. Marking grooves 419 are equidistantly arranged on the edge of the surface of the operation turntable 418. At a position corresponding to the operation turntable 418 on one end of the surface of the fixed box 409, a marking block 420 is fixedly installed. A connecting rod 421 is installed in the middle of the large gear 410. The large gear 410 and the small gear 413 are meshed with each other. The connecting rod 421 passes through the middle of the large gear 410. The connecting rod 421 is connected to the end of the adjusting screw 405. The gear ratio between the large gear 410 and the small gear 413 is 3:1. The transmission ratio between the large transmission wheel 414 and the small transmission wheel 416 is 3:1. The position of the moving block 406 is adjusted by using the adjusting screw 405 to change the distance between the thermal plate 408 and the diode laser 404. The diode laser 404 moves along with the wire rod connector 2. The thermal plate 408 is used to monitor the light emitted by the diode laser 404. And the moving distance of the diode laser 404 matches the tensioned length of the prestressed steel bar. Furthermore, the thermal plate 408 can accurately monitor the tensioned length of the prestressed steel bar, making the control of the tension more precise, preventing over-tensioning or under-tensioning of the prestressed steel bar from affecting the service life of the prestressed steel bar, and reducing the cracking probability of the prestressed beam;

[0075] At the same time, the operation turntable 418 is used to rotate the small transmission wheel 416, so that the rotation angle is transmitted to the large transmission wheel 414. The large transmission wheel 414 drives the small gear 413 to rotate and mesh with the large gear 410. And there is a diameter difference between the large transmission wheel 414 and the small transmission wheel 416. There is a gear ratio between the large gear 410 and the small gear 413. The angle of the two-stage amplified transmission is increased. Thus, the staff can control the small rotation of the adjusting screw 405 by greatly adjusting the operation turntable 418. The rotation operation of the adjusting screw 405 is more precise, giving the staff more space for manual operation, effectively reducing the error rate, and improving the adjustment accuracy of the position of the thermal plate 408, preventing the deviation of the moving position of the thermal plate 408 from resulting in inaccurate subsequent monitoring results;

[0076] One end of the connecting rod 421 is fixedly connected with a fitting round block 422. A limit card slot 423 is opened in the middle of one end of the fitting round block 422. A bracket 424 is fixedly installed at the corresponding position of the surface of the fixed box 409 and the connecting rod 421. An electromagnetic block 425 is fixedly installed at one end of the top of the bracket 424. A positioning frame 426 is fixedly installed in the middle of the top end of the bracket 424. A limit rod 427 is movably installed in the middle of the positioning frame 426. One end of the limit rod 427 is fixedly connected with a metal round block 428. The length and width of the cross-section of the limit rod 427 are equal to the length and width of the limit card slot 423. The positions of the metal round block 428 and the electromagnetic block 425 correspond to each other;

[0077] At both ends of the top of the moving frame 401, hydraulic telescopic rods 429 are symmetrically and fixedly installed. The bottom ends of the two hydraulic telescopic rods 429 are fixedly connected with a lifting frame 430. A tensioner 431 is fixedly installed in the middle of the lifting frame 430. One end of the tensioner 431 is fixedly connected with a fitting block 432. The use of the limit rod 427 to limit and fix the fitting round block 422 improves the stability of the connecting rod 421 and the large gear 410 when they are idle, preventing the adjusting screw 405 and the large gear 410 from shaking and shifting, resulting in mistakes in subsequent position adjustment. At the same time, the electromagnetic block 425 is used to adsorb and fix the metal round block 428 and the limit rod 427, so that they are fixed during the construction process, playing a positioning role. Furthermore, the fitting round block 422 that returns to the original position can be directly limited later, and the operation is convenient;

[0078] The splicing frame 403 is used to fit the pole connector 2, so that the diode laser 404 can move forward with the pole connector 2. Then, by monitoring the position of the diode laser 404, the moving distance of the pole connector 2 can be judged. At the same time, the hydraulic telescopic rod 429 is used to drive the lifting frame 430 to move up and down, which is convenient to change the position of the tensioner 431, so that it can smoothly push the pole connector 2 to move;

[0079] A force detection mechanism 5 is installed in the middle of one end of the moving frame 401;

[0080] The force detection mechanism 5 includes a mounting seat 501;

[0081] One end of the movable frame 401 is fixedly connected to the middle of the mounting base 501. The middle of the mounting base 501 is fixedly installed with a support frame 502. The middle of the support frame 502 is rotatably installed with a winding wheel 503. One end of the winding wheel 503 is fixedly connected to a transmission gear 504. A traction rope 505 is wound around the middle of the winding wheel 503. At a position on one side of the support frame 502 at the bottom of the mounting base 501, a driving motor 506 is fixedly installed. The output shaft of the driving motor 506 is fixedly connected to an incomplete gear 507. One end of the bottom of the mounting base 501 is fixedly connected to an extension frame 508. The top of the extension frame 508 is fixedly installed with a positioning sleeve 509. The traction rope 505 movably passes through the middle of the positioning sleeve 509. The incomplete gear 507 and the transmission gear 504 are meshed with each other. The end of the traction rope 505 is fixedly connected to a connecting block 510. The bottom end of the connecting block 510 is fixedly connected to a mounting flat plate 511. The bottom end of the mounting flat plate 511 is fixedly installed with steel bar diameter detectors 512 at equal intervals. One end of the top of the mounting flat plate 511 is fixedly installed with alarms 517 at equal intervals. The number of the steel bar diameter detectors 512, the alarms 517 and the through holes 3 are the same. The signal output end of the steel bar diameter detector 512 is connected to the signal input end of the alarm 517. The positions of the steel bar diameter detectors 512 correspond to the positions of the through holes 3 one by one. The steel bar diameter detector 512 can be used to detect the diameter of the prestressed tendon after tensioning to judge whether it is within the qualified range after deformation. At the same time, the driving motor 506 is used to drive the incomplete gear 507 to intermittently mesh with the transmission gear 504, so that the winding wheel 503 rotates intermittently to wind the traction rope 505, so that the steel bar diameter detector 512 moves above the prestressed tendon being tensioned, and the steel bar diameter detector 512 stops intermittently for a period of time, so that the diameter of the prestressed tendon below can be detected in multiple segments and compared with each other, and the detection data is more accurate;

[0082] And according to the change of the diameter deformation, it can be judged whether the stress of the prestressed tendon is uniform, so that the staff can replace the unqualified prestressed tendon in time to prevent the uneven stress of the prestressed tendon from causing some positions of it to be stretched too thin, affecting the structural strength and service life of the prestressed tendon;

[0083] Both ends of the mounting flat plate 511 are symmetrically and fixedly connected with support inclined plates 513. The bottom ends of the two support inclined plates 513 are both fixedly connected with fixing plates 514. At one end of the middle of the fixing plate 514 close to the construction pedestal 1, guiding rollers 515 are symmetrically installed. At the bottom end of the fixing plate 514, moving wheels 516 are symmetrically installed. The guiding rollers 515 are closely attached to the edge of the construction pedestal 1;

[0084] One end of the bottom of the extension frame 508 is fixedly connected with a mounting plate 518. One end of the mounting plate 518 is rotatably installed with a rotating long rod 519. A buffer inclined plate 520 is fixedly installed in the middle of the rotating long rod 519. A buffer spring 521 is fixedly installed in the middle of the top end of the mounting plate 518. The top end of the buffer inclined plate 520 is installed with a positioning frame 522. A friction wheel 523 is installed in the middle of the positioning frame 522. The top end of the buffer spring 521 is connected with the bottom of the buffer inclined plate 520. The traction rope 505 is embedded in the middle of the top of the friction wheel 523. By using the guiding roller 515 to closely adhere to the construction pedestal 1, it plays a guiding role in the traveling track of the steel bar diameter detector 512, preventing the steel bar diameter detector 512 from shifting and skewing during the traveling process, which may cause it to fail to align with the corresponding prestressed tendon and affect the normal detection operation. At the same time, the positioning sleeve 509 plays a guiding and stabilizing role for the traction rope 505, preventing it from skewing and shaking during the winding process, resulting in unstable movement of the steel bar diameter detector 512;

[0085] The friction wheel 523 is used to frictionally limit the traction rope 505, and the buffer inclined plate 520 and the buffer spring 521 play a certain buffer tension role, so that the traction rope 505 always remains in a taut state, and buffers and supports the traction rope 505 when the winding stops, preventing a certain tension from being generated on the unwound part at the moment of stopping, which may cause it to have a forward impact phenomenon, improving the positioning accuracy of the steel bar diameter detector 512, and thus making the detection more accurate.

[0086] The working principle and usage process of the present invention are as follows: First, the staff passes the prestressed tendon through the through hole 3, and uses the anchor to lock and fix the prestressed tendon with the pole connector 2, so that it is fixed above the construction pedestal 1. Then, the staff pushes the moving frame 401 to the side of the construction pedestal 1 close to the pole connector 2, and the installation flat plate 511 moves above the construction pedestal 1. The two fixing plates 514 are respectively located on both sides of the construction pedestal 1. The guiding roller 515 closely adheres to the edge of the construction pedestal 1. The steel bar diameter detector 512 corresponds to the fixed prestressed tendon one by one and is located directly above it;

[0087] Then, by adjusting the moving frame 401, the bottom of the splicing frame 403 is closely attached to one end of the top of the pole connector 2. At the same time, the hydraulic telescopic rod 429 extends downward, pushing the lifting frame 430 to descend, so that the tensioner 431 moves to one side of the pole connector 2, and the fitting block 432 is closely attached to the surface of the end of the pole connector 2;

[0088] The staff energizes the electromagnetic block 425, pulls out the limit rod 427 outward so that it no longer inserts into the limit card slot 423, and thus no longer fits against the round block 422 and the connecting rod 421 for limiting. The metal round block 428 fits and adsorbs to the electromagnetic block 425. According to the length that the prestressed tendon needs to be tensioned, the staff needs to adjust the position of the thermosensitive plate 408 so that the distance between the thermosensitive plate 408 and the diode laser 404 corresponds to the tensioning length. Rotate the operation turntable 418. Through the marking groove 419 and the alignment block 420, the rotation amplitude can be accurately grasped. The small transmission wheel 416 rotates synchronously. Since the transmission belt 417 drives and connects the large transmission wheel 414 and the small transmission wheel 416, the large transmission wheel 414 and the small gear 413 rotate accordingly. The transmission ratio between the large transmission wheel 414 and the small transmission wheel 416 is three to one. Therefore, after the staff operates the small transmission wheel 416 to rotate a certain angle, the rotation angle of the large transmission wheel 414 is one-third of it. The small gear 413 and the large gear 410 mesh with each other, and the gear ratio of the large gear 410 and the small gear 413 is three to one. When the small gear 413 rotates the same angle as the large transmission wheel 414, it will drive the large gear 410 and the adjusting screw 405 to rotate one-third of the corresponding angle;

[0089] Through this two-stage transmission conversion, the rotation angle of the adjusting screw 405 is one-ninth of the rotation angle of the staff manually rotating the operation turntable 418. Therefore, the staff manually operates and controls the rotation of the adjusting screw 405 more precisely, and the distance that the moving block 406 slides along the adjusting screw 405 is also more accurate. The moving block 406 drives the connecting frame 407 and the thermosensitive plate 408 to move to the corresponding position, so that the distance between the thermosensitive plate 408 and the diode laser 404 is the expected tensioning length of the prestressed tendon. The tensioner 431 pushes the fitting block 432 forward to push the pole connector 2, and thus operates to tension the fixed prestressed tendon, making the prestressed tendon gradually stretched. The laser emitted downward by the diode laser 404 has a certain temperature. The diode laser 404 moves together with the pole connector 2. The splicing frame 403 slides along the guiding frame 402 until the thermosensitive plate 408 senses the temperature of the laser and controls the tensioner 431 to close, and no longer tensions the prestressed tendon, with precise tensioning control;

[0090] Meanwhile, the driving motor 506 drives the incomplete gear 507 to rotate clockwise, making it intermittently engage with the transmission gear 504. The winding wheel 503 then rotates intermittently to lengthen the traction rope 505. The staff pulls the installation flat plate 511 to move it to one end away from the pole connector 2. During the movement, the guiding roller 515 always closely adheres to the construction pedestal 1, making the movement more stable and preventing the steel bar diameter detector 512 from shifting. The steel bar diameter detector 512 is used to detect the diameter of the tensioned prestressed steel bar below to determine the diameter change after it is stretched.

[0091] Then, the driving motor 506 drives the incomplete gear 507 to rotate counterclockwise, intermittently engaging with the transmission gear 504, causing the winding wheel 503 to rotate intermittently. When rotating, the traction rope 505 is wound, pulling the installation flat plate 511 and the steel bar diameter detector 512 forward. After moving a certain distance, the incomplete gear 507 and the transmission gear 504 no longer engage. The friction force generated by the friction wheel 523, and the buffering protection of the buffer inclined plate 520 and the buffer spring 521 will support and limit the traction rope 505, preventing it from shaking when the winding stops and preventing the installation flat plate 511 and the steel bar diameter detector 512 from surging forward. Thus, the position where the steel bar diameter detector 512 stops is accurate. After positioning, the diameter of the prestressed steel bar below is detected again. Through multiple detections in multiple segments, the difference in data is judged. If uneven stress occurs during tensioning, it will cause a significant difference in the diameter changes at different positions of the prestressed steel bar, indicating that the corresponding prestressed steel bar is unqualified and cannot be used inside the prestressed beam. The corresponding alarm 517 will emit an alarm sound. Each alarm 517 corresponds to each prestressed steel bar. The staff can find the corresponding prestressed steel bar according to the alarm 517 and replace it.

[0092] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A construction method for a prestressed beam, characterized in that, It includes a construction pedestal (1) and construction steps; One end of the top of the construction pedestal (1) is provided with a pole connector (2). Through holes (3) are equidistantly arranged in the middle of the bottom of the pole connector (2). A positioning and monitoring mechanism (4) is arranged on one side of the top of the construction pedestal (1); The positioning and monitoring mechanism (4) includes a moving frame (401); A moving frame (401) is placed on one side of the top of the construction pedestal (1). A guiding frame (402) is fixedly installed in the middle of the top end of the moving frame (401). One end inside the guiding frame (402) is movably installed with a splicing frame (403). The bottom end of the splicing frame (403) is fixedly connected with a diode laser (404); A fixed box (409) is installed at the top end of the moving frame (401). A large gear (410) is installed inside the fixed box (409). An installation frame (411) is installed inside the fixed box (409). A rotating shaft (412) is rotatably installed at the top of the installation frame (411). A small gear (413) is fixedly installed in the middle of the rotating shaft (412). One end of the rotating shaft (412) is fixedly connected with a large transmission wheel (414); A positioning rod (415) is rotatably installed at a position on one side of the installation frame (411) inside the fixed box (409). A small transmission wheel (416) is fixedly installed in the middle of the positioning rod (415). A transmission belt (417) is sleeved between the middle parts of the large transmission wheel (414) and the small transmission wheel (416).

2. The construction method of a prestressed beam according to claim 1, characterized in that An adjusting screw rod (405) is rotatably installed in the middle of the guiding frame (402). A moving block (406) is movably clamped inside the guiding frame (402). The bottom end of the moving block (406) is fixedly connected with a connecting frame (407). One end of the bottom of the connecting frame (407) is fixedly installed with a thermal-sensitive plate (408); One end of the positioning rod (415) is fixedly connected with an operation turntable (418). Marking grooves (419) are equidistantly arranged on the edge of the surface of the operation turntable (418). A marking block (420) is fixedly installed at a position corresponding to the operation turntable (418) on the surface of the fixed box (409). A connecting rod (421) is installed in the middle of the large gear (410).

3. The construction method of a prestressed beam according to claim 2, characterized in that, One end of the connecting rod (421) is fixedly connected with a fitting round block (422). A limiting card slot (423) is arranged in the middle of one end of the fitting round block (422). A support (424) is fixedly installed at a position corresponding to the connecting rod (421) on the surface of the fixed box (409). An electromagnetic block (425) is fixedly installed at one end of the top of the support (424). A positioning frame (426) is fixedly installed in the middle of the top end of the support (424). A limiting rod (427) is movably installed in the middle of the positioning frame (426). One end of the limiting rod (427) is fixedly connected with a metal round block (428); Both ends of the top of the moving frame (401) are symmetrically and fixedly installed with hydraulic telescopic rods (429). The bottom ends of the two hydraulic telescopic rods (429) are fixedly connected with a lifting frame (430). A tensioning device (431) is fixedly installed in the middle of the lifting frame (430). The end of the tensioning device (431) is fixedly connected with a fitting block (432).

4. The construction method of a prestressed beam according to claim 3, characterized in that, The diode laser (404) and the thermal plate (408) are located on the same vertical plane. The adjusting screw rod (405) movably penetrates through the moving block (406) and the splicing frame (403). The adjusting screw rod (405) is threadedly connected with the moving block (406), and the adjusting screw rod (405) is slidably connected with the splicing frame (403). Both side parts of the top of the splicing frame (403) and both side parts of the moving block (406) are symmetrically and fixedly connected with sliding blocks. Both side walls inside the guiding frame (402) are symmetrically provided with sliding grooves. The sliding blocks are movably clamped inside the sliding grooves. The moving block (406), the splicing frame (403) and the guiding frame (402) are all connected by the sliding fit of the sliding blocks and the sliding grooves.

5. The construction method of a prestressed beam according to claim 3, characterized in that, The large gear (410) and the small gear (413) are meshed with each other. The connecting rod (421) penetrates through the middle of the large gear (410). The connecting rod (421) is connected with the end of the adjusting screw rod (405). The gear ratio between the large gear (410) and the small gear (413) is 3:1, and the transmission ratio between the large transmission wheel (414) and the small transmission wheel (416) is 3:

1. The length and width of the cross section of the limiting rod (427) are equal to the length and width of the limiting card slot (423). The positions of the metal round block (428) and the electromagnetic block (425) correspond to each other.

6. The construction method of a prestressed beam according to claim 5, characterized in that A force detection mechanism (5) is installed in the middle of one end of the moving frame (401). The force detection mechanism (5) includes a mounting seat (501). One end of the movable frame (401) is fixedly connected to a mounting base (501) in the middle. A support frame (502) is fixedly installed in the middle of the mounting base (501). A winding wheel (503) is rotatably installed in the middle of the support frame (502). One end of the winding wheel (503) is fixedly connected to a transmission gear (504). A traction rope (505) is wound around the middle of the winding wheel (503). A driving motor (506) is fixedly installed at the bottom of the mounting base (501) on one side of the support frame (502). The output shaft of the driving motor (506) is fixedly connected to an incomplete gear (507). One end of the bottom of the mounting base (501) is fixedly connected to an extension frame (508). A positioning sleeve (509) is fixedly installed at the top of the extension frame (508). The end of the traction rope (505) is fixedly connected to a connecting block (510). The bottom end of the connecting block (510) is fixedly connected to a mounting flat plate (511). Reinforcement diameter detectors (512) are fixedly installed at equal intervals at the bottom end of the mounting flat plate (511). Alarm devices (517) are fixedly installed at equal intervals at one end of the top of the mounting flat plate (511); The traction rope (505) movably passes through the middle of the positioning sleeve (509), and the incomplete gear (507) and the transmission gear (504) are meshed with each other.

7. A construction method of a prestressed beam according to claim 6, characterized in that, Support inclined plates (513) are symmetrically and fixedly connected to both ends of the mounting flat plate (511). Fixed plates (514) are fixedly connected to the bottom ends of the two support inclined plates (513). Guide rollers (515) are symmetrically installed at one end of the middle of the fixed plates (514) close to the construction pedestal (1). Movable wheels (516) are symmetrically installed at the bottom ends of the fixed plates (514); One end of the bottom of the extension frame (508) is fixedly connected to a mounting plate (518). A rotating long rod (519) is rotatably installed at one end of the mounting plate (518). A buffer inclined plate (520) is fixedly installed in the middle of the rotating long rod (519). A buffer spring (521) is fixedly installed at the middle of the top end of the mounting plate (518). A positioning frame (522) is installed at the top end of the buffer inclined plate (520). A friction wheel (523) is installed in the middle of the positioning frame (522).

8. A construction method of a prestressed beam according to claim 7, characterized in that, The number of the reinforcement diameter detectors (512), the alarm devices (517) and the through holes (3) is the same. The signal output end of the reinforcement diameter detector (512) is connected to the signal input end of the alarm device (517). The positions of the reinforcement diameter detectors (512) correspond to the positions of the through holes (3) one by one; The guide rollers (515) are closely attached to the edge of the construction pedestal (1); The top end of the buffer spring (521) is connected to the bottom of the buffer inclined plate (520), and the traction rope (505) is embedded in the middle of the top of the friction wheel (523).

9. A construction method of a prestressed beam according to claim 7, characterized in that, The construction steps include the following steps: S1. Positioning: Push the moving frame (401) to one side of the construction pedestal (1) so that the splicing frame (403) is close to one end at the top of the pole connector (2), and the two tensioners (431) descend to one side of the pole connector (2). S2. Anchoring: Pass the prestressed tendon through the through hole (3) and use the anchor to fixedly connect the prestressed tendon to the pole connector (2) so that it is fixed above the construction pedestal (1). S3. Adjusting: Rotate the operation turntable (418) to drive the small transmission wheel (416), large transmission wheel (414), small gear (413) and large gear (410) to rotate in sequence, so that the adjusting screw (405) rotates to correspondingly adjust the positions of the moving block (406) and the thermal sensitive plate (408). S4. Tensioning: Start the tensioner (431) to push the pole connector (2) forward to tension the prestressed tendon, and use the change in the relative distance between the thermal sensitive plate (408) and the diode laser (404) to judge the elongation of the prestressed tendon. S5. Detecting: After the tensioning is completed, use the steel bar diameter detector (512) to detect the diameter of the tensioned prestressed tendon below to judge whether it meets the qualified range of deformation. S6. Transposition: Use the drive motor (506) to control the rotation of the winding wheel (503) to wind the traction rope (505), thereby pulling the installation flat plate (511) and the steel bar diameter detector (512) to move forward to detect the prestressed tendon multiple times, and remove and replace the prestressed tendon with unqualified diameter change caused by uneven stress.

10. A prestressed beam, characterized in that, The beam constructed by the construction method of a prestressed beam according to any one of claims 1-9.

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