Prestressed steel strand turnover device for broken line pre-tensioning method concrete precast beam

Abstract

The invention belongs to the technical field of steel strand turnover, and particularly relates to a broken line pre-tensioning method concrete precast beam prestressed steel strand turnover device which comprises a turnover base, and a transverse driving telescopic adjusting mechanism, a stress adjusting circumferential rotating mechanism, a steel strand clamping and locking mechanism and a locking driving adjusting mechanism are arranged in the top end of the turnover base. According to the prestressed steel strand turnover device for the broken line pre-tensioning method concrete precast beam, the transverse driving telescopic adjusting mechanism is arranged, so that the steel strand is allowed to be accurately adjusted in the transverse direction to adapt to precast beams with different widths, uniform distribution of prestress is ensured, the production flexibility of the precast beams is improved, and different engineering requirements are met; the layout and adjustment process of the steel strands is simplified, and the construction efficiency is improved; the stress adjusting circumferential rotating mechanism is arranged to rotate a motor and a gear system, so that the prestress of the steel strand can be accurately controlled, the stress of the steel strand is uniformly adjusted, and the quality of a precast beam is improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel strand turnover, and in particular to a prestressed steel strand turnover device for a precast concrete beam using a broken line pretensioning method. Background Art

[0002] In current bridge construction, every two steel strands are usually connected by an independent swivel sleeve, and the pulling adjustment is performed by rotating the thread to lock or release it, so as to achieve the lateral adjustment of the steel strands. However, this traditional adjustment method has the following problems and is not conducive to production:

[0003] 1. The process of thread rotation locking or releasing is relatively cumbersome and requires manual operation one by one, resulting in low adjustment efficiency and extending the construction period. 2. Manual rotation adjustment is difficult to achieve precise steel strand positioning, which can easily cause uneven prestress distribution and affect the quality of precast beams. 3. Frequent thread rotation operations are a physical labor for construction workers, which increases the labor intensity of workers and is easy to fatigue. 4. During the adjustment process, due to the need to apply a large torque, operators may suffer accidental injuries, which poses certain safety risks. 5. Long-term use and frequent rotation operations will cause thread wear, reduce the service life of the turnover sleeve, and increase maintenance costs. 6. For precast beams of different specifications and sizes, the traditional adjustment method may require different turnover sleeves and tools, and has poor adaptability, so a prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method is required. Summary of the invention

[0004] Based on the existing technical problems, the present invention proposes a prestressed steel strand turnover device for a precast concrete beam using a broken line pretensioning method.

[0005] The present invention proposes a prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method, comprising a turnover base, wherein a lateral drive telescopic adjustment mechanism, a stress adjustment circular rotation mechanism, a steel strand clamping and locking mechanism and a locking drive adjustment mechanism are respectively arranged inside the top of the turnover base.

[0006] The transverse drive telescopic adjustment mechanism realizes the movement of the steel strands on both sides of the revolving base to move and adjust in the transverse direction.

[0007] The stress regulating circular rotating mechanism realizes the action of adjusting the stress of the steel strands at both ends of the revolving base.

[0008] The steel strand clamping and locking mechanism realizes the action of clamping, locking and positioning the steel strands at both ends of the turnover base.

[0009] The locking drive adjustment mechanism realizes the action of driving the clamping of the steel strand clamping locking mechanism.

[0010] Preferably, the lateral drive telescopic adjustment mechanism includes a drive chamber opened inside the revolving base, the drive chamber is located in the middle of the revolving base, and a drive box is fixedly installed on the inner wall of the drive chamber, an operating tube is fixedly installed on the inner wall of the drive box, one end of the operating tube passes through and extends to the outer surface of the revolving base, and a valve is installed on the surface of the operating tube.

[0011] Preferably, a driving slide groove is also opened inside the revolving base, a connecting pipe is fixedly installed at one end of the driving slide groove, the opposite ends of multiple connecting pipes are fixedly connected to the surface of the driving box, and the opposite ends of multiple connecting pipes have feed ports fixedly connected to the interior of the driving box, a solenoid valve is installed on the surface of each connecting pipe, the other ends of multiple driving slide grooves penetrate and extend to the outer surface of the revolving base, and multiple driving slide grooves are linearly arranged and distributed in the vertical direction of the revolving base.

[0012] Preferably, a driving piston is slidably inserted into the inner wall of the driving groove, and the surface of the driving piston is sealed and slid with the driving groove via a sealing ring. A fixed sleeve is fixedly installed on one side of the driving piston, and the arc surface of the fixed sleeve is slidably inserted into the inner wall of one end of the driving groove. A driving spring is movably sleeved on the surface of the fixed sleeve, one end of the driving spring is installed on the surface of the driving piston, and the other end of the driving piston is fixedly installed on the opposite inner wall of the driving groove.

[0013] Preferably, the stress-adjusting circular rotating mechanism comprises a support seat mounted on the inner wall of the fixed sleeve, a rotating motor is fixedly mounted on the top of the support seat, a gear shaft is fixedly mounted on the output end of the rotating motor via a coupling, and a driving gear is fixedly mounted on one end of the gear shaft.

[0014] Preferably, an annular slide rail is fixedly installed on the inner wall of one end of the fixed sleeve, a slewing bearing is fixedly installed on the inner wall of the other end of the fixed sleeve, a rotating sleeve is fixedly installed on the inner ring surface of the slewing bearing, an annular slider is fixedly installed on the outer arc surface of one end of the rotating sleeve, a plurality of the annular sliders are distributed in an annular array at one end of the rotating sleeve, a plurality of the annular sliders are slidably plugged with the annular slide rail, a gear ring is fixedly installed on the arc inner wall of the other end of the rotating sleeve, and the tooth grooves of the gear ring are meshed with the gear teeth of the driving gear.

[0015] Preferably, the steel strand clamping and locking mechanism includes a clamping pressure box installed on the inner wall of the rotating sleeve, the surface of the clamping pressure box is in a circular ring shape, a clamping pressure chamber is opened inside the clamping pressure box, the four clamping pressure chambers are fixedly connected, a clamping rod is slidably inserted into the inner wall of the clamping pressure chamber, a pressure piston is fixedly installed at one end of the clamping rod, and the surrounding surfaces of the pressure piston are slidably inserted into the inner wall of the clamping pressure chamber through a sealing gasket.

[0016] Preferably, a compression spring is fixedly installed on the surface of the pressure piston, and every two of the compression springs are respectively located on both sides of each of the clamping rods. One ends of the multiple compression springs are fixedly installed on the inner wall of the clamping pressure chamber, and an arc-shaped clamping block is fixedly installed on the other end of the clamping rod. The four arc-shaped clamping blocks are distributed in a circular array, and a limiting ball is welded at one end of the steel strand. The arc-shaped clamping surfaces of the four arc-shaped clamping blocks are squeezed against the arc surface of the limiting ball.

[0017] Preferably, the locking drive adjustment mechanism includes an adjusting tube installed on the inner wall of the rotating sleeve, the bottom end of the adjusting tube is fixedly installed on the surface of the clamping pressure box, and the interior of the adjusting tube is fixedly connected to the interior of the clamping pressure chamber, and hydraulic oil is provided in the interior of the adjusting tube and the interior of the clamping pressure chamber.

[0018] Preferably, an electric telescopic rod is fixedly installed on the top of the adjusting tube, the telescopic end of the electric telescopic rod penetrates and extends into the interior of the adjusting tube, and a thrust piston is also fixedly installed on the telescopic end of the electric telescopic rod, the arc surface of the thrust piston is slidably plugged with the inner wall of the adjusting tube through a sealing ring, and the telescopic movement of the electric telescopic rod realizes the action of increasing or decreasing the internal hydraulic oil pressure.

[0019] The beneficial effects of the present invention are:

[0020] By setting up a transverse drive telescopic adjustment mechanism, it is achieved that the steel strand can be accurately adjusted in the transverse direction to adapt to precast beams of different widths, ensure uniform distribution of prestress, improve the production flexibility of precast beams, adapt to different engineering requirements, simplify the layout and adjustment process of the steel strand, and improve construction efficiency; the stress adjustment circular rotation mechanism is set up to achieve a rotating motor and gear system, which can accurately control the prestress of the steel strand, achieve uniform adjustment of the stress of the steel strand, improve the quality of the precast beam, reduce the error when manually adjusting the stress, and improve construction safety; the steel strand clamping and locking mechanism is set up to firmly fix the steel strand to prevent it from sliding during the tensioning process, ensure the stability of the prestressing, improve the bearing capacity of the precast beam, facilitate the rapid installation and disassembly of the steel strand, and improve construction efficiency; the locking drive adjustment mechanism is set up to be driven by the hydraulic system, which can realize precise control of the clamping force of the steel strand, provide a stable clamping force, ensure the uniform tensioning of the prestressed steel strand, and the electric control realizes automated operation, reducing the intensity of manual labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method;

[0022] Figure 2 A cross-sectional view of a turnover base structure of a prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method;

[0023] Figure 3 A three-dimensional diagram of a transverse drive telescopic adjustment mechanism of a prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method;

[0024] Figure 4 A prestressed steel strand turnover device for precast concrete beams using a folding line prestressing method Figure 3 A magnified view of the structure at center;

[0025] Figure 5 A three-dimensional diagram of the fixed sleeve structure of a prestressed steel strand turnover device for a precast concrete beam using a folding line prestressing method;

[0026] Figure 6 A three-dimensional diagram of a stress-adjusting circular rotating mechanism of a prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method;

[0027] Figure 7 It is a three-dimensional cross-sectional view of a stress-adjusting circular rotating mechanism of a prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method;

[0028] Figure 8 It is a three-dimensional exploded view of a stress-adjusting circular rotating mechanism of a prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method;

[0029] Fig. 9 A three-dimensional diagram of a steel strand clamping and locking mechanism of a prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method;

[0030] Fig.10 It is a three-dimensional diagram of the locking drive adjustment mechanism of a prestressed steel strand turnover device for a precast concrete beam using a broken line pretensioning method.

[0031] In the figure: 1. revolving base; 2. lateral drive telescopic adjustment mechanism; 21. drive chamber; 22. drive box; 23. operating pipe; 24. valve; 25. drive slide; 26. connecting pipe; 27. solenoid valve; 28. drive piston; 29. ​​fixed sleeve; 210. drive spring; 3. stress adjustment circular rotation mechanism; 31. support seat; 32. rotating motor; 33. gear shaft; 34. driving gear; 35. annular slide rail; 36. turntable bearing; 37. rotating sleeve; 38. annular slider; 39. gear ring; 4. steel strand clamping and locking mechanism; 41. clamping pressure box; 42. clamping pressure chamber; 43. clamping rod; 44. pressure piston; 45. compression spring; 46. arc clamping block; 47. limit ball; 5. locking drive adjustment mechanism; 51. adjustment pipe; 52. electric telescopic rod; 53. thrust piston. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figure 1-Figure 10 A prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method comprises a turnover base 1, the top of which is internally provided with a lateral drive telescopic adjustment mechanism 2, a stress adjustment circular rotation mechanism 3, a steel strand clamping and locking mechanism 4 and a locking drive adjustment mechanism 5.

[0034] In order to realize the lateral movement and adjustment of the steel strands on both sides of the revolving base 1, a lateral drive telescopic adjustment mechanism 2 is set, which includes a drive chamber 21 opened inside the revolving base 1. The drive chamber 21 is located in the middle of the revolving base 1, and a drive box 22 is fixedly installed on the inner wall of the drive chamber 21. An operating pipe 23 is fixedly installed on the inner wall of the drive box 22. One end of the operating pipe 23 passes through and extends to the outer surface of the revolving base 1. A valve 24 is installed on the surface of the operating pipe 23. The feed end of the operating pipe 23 is connected to a hydraulic pump, and the hydraulic oil is input into the interior of the operating pipe 23 through the hydraulic pump.

[0035] Specifically, through the operating tube 23 and the valve 24, the steel strands can be easily moved and adjusted in the lateral direction on both sides of the revolving base 1 to meet the requirements of different prefabricated beam widths for the position of the prestressed steel strands; the design of the valve 24 allows the operator to accurately control the extension and contraction of the operating tube 23, thereby accurately adjusting the position of the steel strands and ensuring the accuracy of the prestressing.

[0036] A driving groove 25 is also provided inside the revolving base 1, and a connecting pipe 26 is fixedly installed at one end of the driving groove 25. The opposite ends of the multiple connecting pipes 26 are fixedly connected to the surface of the driving box 22, and the feed ports at the opposite ends of the multiple connecting pipes 26 are fixedly connected to the interior of the driving box 22. A solenoid valve 27 is installed on the surface of each connecting pipe 26. The other ends of the multiple driving grooves 25 penetrate and extend to the outer surface of the revolving base 1, and the multiple driving grooves 25 are linearly arranged in the vertical direction of the revolving base 1.

[0037] Specifically implemented in this way, the driving slide grooves 25 are linearly arranged and distributed in the vertical direction of the revolving base 1, so that the lateral adjustment of the steel strands is more uniform and linear, which helps to achieve accurate prestressing; through the combination of multiple connecting pipes 26 and solenoid valves 27, the movement of the steel strands can be controlled simultaneously or separately at different positions, thereby improving the flexibility and accuracy of the adjustment; a solenoid valve 27 is installed on the surface of each connecting pipe 26, which can realize independent control of each steel strand, avoid mutual interference between the steel strands, and ensure uniform prestressing of each steel strand.

[0038] A driving piston 28 is slidably inserted into the inner wall of the driving groove 25, and the surface of the driving piston 28 is sealed and slid with the driving groove 25 through a sealing ring. A fixed sleeve 29 is fixedly installed on one side of the driving piston 28, and the arc surface of the fixed sleeve 29 is slidably inserted into the inner wall of one end of the driving groove 25. A driving spring 210 is movably sleeved on the surface of the fixed sleeve 29, one end of the driving spring 210 is installed on the surface of the driving piston 28, and the other end of the driving piston 28 is fixedly installed on the opposite inner wall of the driving groove 25.

[0039] Specifically, the driving piston 28 slides in a sealed manner with the driving groove 25 through a sealing ring, ensuring that hydraulic oil or other media will not leak during the adjustment process, thereby maintaining the pressure and function of the system; the sliding of the driving piston 28 in the driving groove 25 can achieve precise linear drive, thereby accurately controlling the position of the steel strand and the application of prestress; by adjusting the preload force of the driving spring 210, the stroke and force of the driving piston 28 can be changed to adapt to different prestress application requirements; and then, lateral movement adjustment can be performed during the installation and stretching of the steel strand, and independent control of multiple steel strands can also be performed.

[0040] In order to realize the action of adjusting the stress of the steel strands at both ends of the revolving base 1, a stress adjustment circular rotating mechanism 3 is set, which includes a support seat 31 installed on the inner wall of the fixed sleeve 29, and a rotating motor 32 is fixedly installed on the top of the support seat 31. A gear shaft 33 is fixedly installed on the output end of the rotating motor 32 through a coupling, and a driving gear 34 is fixedly installed on one end of the gear shaft 33.

[0041] Specifically implemented in this way, the use of the rotating motor 32 allows the driving gear 34 to rotate in a circle, thereby achieving stress adjustment of the steel strand. This rotation adjustment method can accurately control the size of the prestress; the fixed installation of the support seat 31 provides a stable support point for the rotating motor 32, reduces the vibration of the motor during operation, and improves the stability of the entire system.

[0042] An annular slide rail 35 is fixedly installed on the inner wall of one end of the fixed sleeve 29, a slewing bearing 36 is fixedly installed on the inner wall of the other end of the fixed sleeve 29, a rotating sleeve 37 is fixedly installed on the inner ring surface of the slewing bearing 36, an annular slider 38 is fixedly installed on the outer arc surface of one end of the rotating sleeve 37, multiple annular sliders 38 are distributed in an annular array at one end of the rotating sleeve 37, and multiple annular sliders 38 are slidably plugged with the annular slide rail 35, and a gear ring 39 is fixedly installed on the arc inner wall of the other end of the rotating sleeve 37, and the tooth grooves of the gear ring 39 are meshed with the gear teeth of the driving gear 34.

[0043] Specifically implemented in this way, the setting of the annular slide rail 35 and the annular slider 38 provides a precise guiding effect, ensuring that the rotating sleeve 37 slides smoothly in the fixed sleeve 29, thereby realizing the precise stress adjustment of the steel strand; the tooth grooves of the ring gear 39 mesh with the gear teeth of the driving gear 34, which can effectively transmit the power of the rotating motor 32 to the rotating sleeve 37, thereby realizing the circumferential stress adjustment of the steel strand; when stress torsion occurs during the pulling of the steel strand, the driving gear 34 rotates to drive the ring gear 39 to rotate, thereby realizing the effect of rotating the rotating sleeve 37 to drive the steel strand to rotate and adjust the stress.

[0044] In order to realize the action of clamping, locking and positioning the steel strands at both ends of the revolving base 1; a steel strand clamping and locking mechanism 4 is set, including a clamping pressure box 41 installed on the inner wall of the rotating sleeve 37, the surface of the clamping pressure box 41 is in a circular ring shape, and a clamping pressure chamber 42 is opened inside the clamping pressure box 41, and the four clamping pressure chambers 42 are fixedly connected, and a clamping rod 43 is slidably inserted into the inner wall of the clamping pressure chamber 42, and a pressure piston 44 is fixedly installed at one end of the clamping rod 43, and the surrounding surfaces of the pressure piston 44 are slidably inserted into the inner wall of the clamping pressure chamber 42 through a sealing gasket.

[0045] Specifically implemented in this way, the annular shape design of the clamping pressure box 41 can evenly surround the steel strand to achieve all-round clamping, ensuring the accurate positioning of the steel strand at both ends of the turnover base 1; the four clamping pressure chambers 42 are fixedly connected to ensure that the pressure is evenly distributed on each clamping rod 43, thereby evenly applying force to the steel strand; the clamping rod 43 is slidably inserted in the clamping pressure chamber 42, and the movement of the clamping rod 43 can be accurately controlled by the pressure piston 44 to achieve accurate clamping of the steel strand; the design of the clamping pressure box 41 can adapt to steel strands of different diameters and specifications, so that the clamping locking mechanism has a wider range of applicability.

[0046] A compression spring 45 is fixedly installed on the surface of the pressure piston 44, and every two compression springs 45 are respectively located on both sides of each clamping rod 43. One ends of the multiple compression springs 45 are fixedly installed on the inner wall of the clamping pressure chamber 42, and an arc-shaped clamping block 46 is fixedly installed on the other end of the clamping rod 43. The four arc-shaped clamping blocks 46 are distributed in a ring array, and a limiting ball 47 is welded to one end of the steel strand. The arc-shaped clamping surfaces of the four arc-shaped clamping blocks 46 are squeezed against the arc surface of the limiting ball 47.

[0047] Specifically implemented in this way, the arc surface of the arc clamp block 46 and the limiting ball 47 squeeze each other, thereby achieving precise positioning of the steel strand and ensuring the accuracy of prestressing; the design of the arc clamp block 46 can protect the surface of the steel strand from damage and extend the service life of the steel strand; the arc clamp blocks 46 distributed in a circular array can adapt to steel strands of different diameters, thereby improving the versatility of the device; through mechanical clamping, the risk of safety accidents caused by loosening or falling off of the steel strand is reduced.

[0048] In order to realize the action of driving the clamping of the steel strand clamping locking mechanism 4, a locking driving adjustment mechanism 5 is provided, which includes an adjusting tube 51 installed on the inner wall of the rotating sleeve 37, and the bottom end of the adjusting tube 51 is fixedly installed on the surface of the clamping pressure box 41, and the interior of the adjusting tube 51 is fixedly connected with the interior of the clamping pressure chamber 42, and hydraulic oil is provided in the interior of the adjusting tube 51 and the interior of the clamping pressure chamber 42.

[0049] Specifically, by transmitting pressure through hydraulic oil, the clamping rod 43 can be accurately driven, thereby realizing the clamping and locking action of the steel strand; the hydraulic system can ensure that the pressure is evenly transmitted to each clamping rod 43, so that the force exerted on the steel strand during the clamping process is evenly distributed, avoiding local overpressure; the hydraulic system allows the operator to accurately control the clamping force by adjusting the pressure of the hydraulic oil to meet different prestressed construction requirements.

[0050] An electric telescopic rod 52 is fixedly installed on the top of the adjusting tube 51. The telescopic end of the electric telescopic rod 52 penetrates and extends into the interior of the adjusting tube 51. A thrust piston 53 is also fixedly installed on the telescopic end of the electric telescopic rod 52. The arc surface of the thrust piston 53 is slidably connected with the inner wall of the adjusting tube 51 through a sealing ring. The telescopic movement of the electric telescopic rod 52 realizes the action of increasing or decreasing the internal hydraulic oil pressure.

[0051] Specifically implemented in this way, the use of the electric telescopic rod 52 realizes the electric control of the clamping and locking mechanism, improves the degree of automation of the operation, and reduces manual operation; through the telescopic movement of the electric telescopic rod 52, the position of the thrust piston 53 in the regulating tube 51 can be accurately controlled, thereby accurately adjusting the oil pressure of the internal hydraulic oil; electric control reduces the risk of workers directly contacting the high-pressure system and improves construction safety.

[0052] By setting up a transverse drive telescopic adjustment mechanism 2, it is achieved that the steel strand can be accurately adjusted in the transverse direction to adapt to precast beams of different widths, ensuring uniform distribution of prestress, improving the production flexibility of precast beams, adapting to different engineering requirements, simplifying the layout and adjustment process of the steel strand, and improving construction efficiency; the stress adjustment circular rotation mechanism 3 is set up to achieve a rotating motor 32 and a gear system, which can accurately control the prestress of the steel strand, achieve uniform adjustment of the stress of the steel strand, improve the quality of the precast beam, reduce the error when manually adjusting the stress, and enhance construction safety; the steel strand clamping and locking mechanism 4 is set up to firmly fix the steel strand to prevent it from sliding during the tensioning process, ensure the stability of the prestressing, improve the bearing capacity of the precast beam, facilitate the rapid installation and disassembly of the steel strand, and improve construction efficiency; the locking drive adjustment mechanism 5 is set up to be driven by the hydraulic system, which can achieve precise control of the clamping force of the steel strand, provide a stable clamping force, ensure the uniform tensioning of the prestressed steel strand, and the electric control realizes automated operation, reducing the intensity of manual labor.

[0053] Working principle: When the steel strands are pulled and installed during operation, the opposite ends of the two steel strands are inserted into the fixed sleeves 29 on both sides of the turnover base 1, and the electric telescopic rod 52 is extended to control the thrust piston 53 to push the hydraulic oil forward to increase the hydraulic oil pressure inside the hydraulic oil, thereby controlling the oil pressure inside the clamping pressure chamber 42 to increase, and the pressure piston 44 is pushed to move by the oil pressure, thereby driving the clamping rod 43 to move outward, and synchronously controlling the four clamping rods 43 to move toward each other, driving the arc clamping block 46 to squeeze the surface of the limit ball 47 of the steel strand to fix and lock it.

[0054] After the steel strand is locked, a pulling operation is performed. When stress torsion occurs during pulling, the rotating motor 32 is started to drive the gear shaft 33 to rotate, drive the driving gear 34 to rotate, and use the driving gear 34 to drive the gear ring 39 to rotate, drive the rotating sleeve 37 to rotate, thereby driving the rotation stress of the clamped steel strand to adjust, release the rotational torque, and when precise pulling and movement adjustment is required in the lateral direction, the hydraulic oil inside the hydraulic pump can also be used to enter the driving chamber 21 inside the revolving base 1, and the electromagnetic valve 27 can be opened or closed to achieve the independent fixed sleeve 29 Lateral movement adjustment of the pulling force.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A prestressed steel strand turnover device for a precast concrete beam using a folding line pretensioning method, comprising a turnover base (1), characterized in that: The top end of the revolving base (1) is internally provided with a lateral drive telescopic adjustment mechanism (2), a stress adjustment circular rotation mechanism (3), a steel strand clamping and locking mechanism (4) and a locking drive adjustment mechanism (5); The transverse drive telescopic adjustment mechanism (2) realizes the movement of the steel strands on both sides of the revolving base (1) in the transverse direction; The stress adjustment circular rotating mechanism (3) realizes the action of adjusting the stress of the steel strands at both ends of the revolving base (1); The steel strand clamping and locking mechanism (4) realizes the action of clamping, locking and positioning the steel strands at both ends of the revolving base (1); The locking drive adjustment mechanism (5) realizes the driving clamping action of the steel strand clamping locking mechanism (4).

2. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 1 is characterized by: The transverse drive telescopic adjustment mechanism (2) comprises a drive chamber (21) provided inside the revolving base (1), the drive chamber (21) being located in the middle of the revolving base (1), and a drive box (22) being fixedly mounted on the inner wall of the drive chamber (21), an operating tube (23) being fixedly mounted on the inner wall of the drive box (22), one end of the operating tube (23) passing through and extending to the outer surface of the revolving base (1), and a valve (24) being mounted on the surface of the operating tube (23).

3. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 2 is characterized by: The interior of the revolving base (1) is also provided with a driving slide groove (25), one end of which is fixedly installed with a connecting pipe (26), the opposite ends of the plurality of connecting pipes (26) are fixedly connected to the surface of the driving box (22), and the opposite ends of the plurality of connecting pipes (26) are fixedly connected to the interior of the driving box (22), and the opposite ends of the plurality of connecting pipes (26) are fixedly connected to the interior of the driving box (22), and the surface of each connecting pipe (26) is installed with a solenoid valve (27), the other ends of the plurality of driving slide grooves (25) penetrate and extend to the outer surface of the revolving base (1), and the plurality of driving slide grooves (25) are linearly arranged and distributed in the vertical direction of the revolving base (1).

4. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 3 is characterized by: A driving piston (28) is slidably inserted into the inner wall of the driving groove (25), and the surface of the driving piston (28) is sealed and slidably connected to the driving groove (25) through a sealing ring. A fixed sleeve (29) is fixedly installed on one side of the driving piston (28), and the arc surface of the fixed sleeve (29) is slidably inserted into the inner wall of one end of the driving groove (25). A driving spring (210) is movably sleeved on the surface of the fixed sleeve (29), and one end of the driving spring (210) is installed on the surface of the driving piston (28), and the other end of the driving piston (28) is fixedly installed on the opposite inner wall of the driving groove (25).

5. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 4 is characterized by: The stress regulating circular rotating mechanism (3) comprises a support seat (31) mounted on the inner wall of the fixed sleeve (29), a rotating motor (32) being fixedly mounted on the top of the support seat (31), a gear shaft (33) being fixedly mounted on the output end of the rotating motor (32) via a coupling, and a driving gear (34) being fixedly mounted on one end of the gear shaft (33).

6. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 5 is characterized by: An annular slide rail (35) is fixedly mounted on the inner wall of one end of the fixed sleeve (29), a slewing bearing (36) is fixedly mounted on the inner wall of the other end of the fixed sleeve (29), a rotating sleeve (37) is fixedly mounted on the inner ring surface of the slewing bearing (36), an annular slider (38) is fixedly mounted on the outer arc surface of one end of the rotating sleeve (37), a plurality of the annular sliders (38) are distributed in an annular array at one end of the rotating sleeve (37), and the plurality of the annular sliders (38) are slidably plugged with the annular slide rail (35), a gear ring (39) is fixedly mounted on the inner wall of the arc at the other end of the rotating sleeve (37), and the tooth grooves of the gear ring (39) are meshed with the gear teeth of the driving gear (34).

7. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 6 is characterized by: The steel strand clamping and locking mechanism (4) comprises a clamping pressure box (41) installed on the inner wall of the rotating sleeve (37); the surface of the clamping pressure box (41) is in the shape of a circular ring; a clamping pressure chamber (42) is provided inside the clamping pressure box (41); four clamping pressure chambers (42) are fixedly connected; a clamping rod (43) is slidably inserted into the inner wall of the clamping pressure chamber (42); a pressure piston (44) is fixedly installed at one end of the clamping rod (43); and the surrounding surfaces of the pressure piston (44) are slidably inserted into the inner wall of the clamping pressure chamber (42) through a sealing gasket.

8. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 7 is characterized by: A compression spring (45) is fixedly mounted on the surface of the pressure piston (44), and every two of the compression springs (45) are respectively located on both sides of each of the clamping rods (43). One end of each of the compression springs (45) is fixedly mounted on the inner wall of the clamping pressure chamber (42), and an arc-shaped clamping block (46) is fixedly mounted on the other end of the clamping rod (43). The four arc-shaped clamping blocks (46) are distributed in a circular array. A limiting ball (47) is welded to one end of the steel strand, and the arc-shaped clamping surfaces of the four arc-shaped clamping blocks (46) are squeezed against the arc surface of the limiting ball (47).

9. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 6, characterized in that: The locking drive adjustment mechanism (5) comprises an adjustment tube (51) mounted on the inner wall of the rotating sleeve (37), the bottom end of the adjustment tube (51) being fixedly mounted on the surface of the clamping pressure box (41), and the interior of the adjustment tube (51) being fixedly connected to the interior of the clamping pressure chamber (42), and the interior of the adjustment tube (51) and the interior of the clamping pressure chamber (42) are both provided with hydraulic oil.

10. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method according to claim 9, characterized in that: An electric telescopic rod (52) is fixedly mounted on the top end of the regulating tube (51), the telescopic end of the electric telescopic rod (52) penetrates and extends into the interior of the regulating tube (51), and a thrust piston (53) is also fixedly mounted on the telescopic end of the electric telescopic rod (52), the arc surface of the thrust piston (53) is slidably plugged with the inner wall of the regulating tube (51) via a sealing ring, and the telescopic movement of the electric telescopic rod (52) realizes the action of increasing or decreasing the internal hydraulic oil pressure.

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