Pre-stressing tendon tensioning auxiliary trolley

Abstract

The invention provides a prestressing tendon tensioning auxiliary trolley which is characterized by comprising a trolley chassis, a rack arranged on the trolley chassis, a rail arranged above the rack, a rail car which is arranged on the rail and can move along the rail, an electric hoist arranged below the rail car and a tensioning jack arranged below the electric hoist. And a tensioning mechanism is arranged on the trolley chassis, is arranged under the rail, and is used for pulling the tensioning jack and preventing the tensioning jack from swinging leftwards and rightwards greatly. The tensioning jack of the trolley can be prevented from shaking at will, so that the tensioning jack is prevented from colliding with equipment or workers, and the stability and safety during working are guaranteed; the angle of the tensioning jack can be adjusted according to needs so as to adapt to prestressing tendons of different angles and different use requirements.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated box girder construction, in particular to a prestressed beam tensioning auxiliary trolley. Background Art

[0002] Prestressed tensioning technology aims to induce a compressive stress state by pre-applying tensile force to the prestressed tendons inside the component, thereby effectively resisting the deformation caused by external loads, enhancing the bending strength, stiffness and durability of the component, and significantly delaying the formation of cracks. Especially for bridge structures, the application of prestress can greatly improve their bearing capacity.

[0003] In the currently widely used tensioning trolley design, electric hoists are often used as the power source to drive the tensioning jack to move vertically to adjust the position. However, during the lifting process, the tensioning jack is easily affected by various factors and swings. If the swing amplitude is too large, it may endanger the safety of the operator working nearby, and may also collide with the trolley structure, causing safety hazards. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a prestressed tendon tensioning auxiliary trolley to solve the problem of large swing amplitude of the tensioning jack.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A prestressed tendon tensioning auxiliary trolley comprises a trolley chassis, a frame arranged on the trolley chassis, a track arranged above the frame, a rail car arranged on the track and movable along the track, an electric hoist arranged below the rail car, a tensioning jack arranged below the electric hoist, a tensioning mechanism arranged on the trolley chassis, the tensioning mechanism being arranged just below the track, and the tensioning mechanism being used to hold the tensioning jack to prevent the tensioning jack from swinging left and right significantly.

[0007] In a preferred solution, the tensioning mechanism includes a tensioner arranged on the trolley chassis, a connecting rope arranged on the tensioner, a clamping member arranged in the length direction on the tensioning jack, and the connecting rope is connected to the clamping member;

[0008] The trolley chassis is an electric flatbed chassis;

[0009] The tensioner is a winch, and the connecting rope is wound around the winch.

[0010] In a preferred solution, at least three holding members are provided, one of which is arranged in the middle of the tensioning jack, and the other is arranged at a certain distance from the holding member arranged in the middle;

[0011] The electric hoist is connected to the upper part of the clamping member arranged in the middle of the tensioning jack;

[0012] A linear moving mechanism is provided between the two holding members on the left and right sides, and the linear moving mechanism includes a movable slider, a connecting seat is provided on the slider, a pull ring is provided on the connecting seat, and a connecting rope is connected to the pull ring;

[0013] A tension sensor is provided on the connecting rope;

[0014] The linear moving mechanism can drive the slider to move, thereby driving the connection point between the pull ring and the connecting rope to move, so that the tensioning jack can rotate around the connection point between the middle clamping piece and the electric hoist, and the front end of the tensioning jack can swing to a certain angle;

[0015] A protrusion is provided on one side below the two clamping members, and a linear motion mechanism is arranged on the protrusion. The linear motion mechanism also includes a screw rod arranged between the two protrusions, and a slider is arranged on the screw rod;

[0016] A stepped hole is arranged on the protrusion, a first bearing is arranged in the stepped hole, a screw rod is sleeved on the first bearing, a first motor is arranged on one side of the protrusion, and the first motor is connected to the screw rod through a coupling.

[0017] In the preferred embodiment, the clamping member includes an upper clamping member and a lower clamping member, both of which have an arc structure matching the shape of the tensioning jack, bosses are provided on both sides of the upper clamping member and the lower clamping member, threaded holes are provided on the bosses, and the upper clamping member and the lower clamping member are connected by installing screws in the threaded holes.

[0018] In a preferred solution, a V-shaped support frame is further provided on the trolley, and the V-shaped support frame is also arranged directly below the track, and an avoidance groove for avoiding the linear moving mechanism is provided at the V-shaped bottom of the V-shaped support frame;

[0019] A guide seat is arranged on one side of the V-shaped support frame, a guide hole is arranged on the guide seat, and a connecting rope passes through the guide hole and is connected to the pull ring;

[0020] The guide seat is U-shaped, and wear-resistant rings coaxial with the guide hole and with an inner diameter smaller than the guide hole are provided on both sides of the guide hole, and the connecting rope passes through the wear-resistant rings;

[0021] A plurality of rolling mechanisms are arranged on one side of the wear-resistant ring, and the rolling mechanisms surround the central hole of the wear-resistant ring in the middle. The rolling mechanisms include a mounting seat, a first fixed shaft arranged between two mounting seats, a rolling body mounted on the first fixed shaft, and a second bearing installed between the rolling body and the first fixed shaft.

[0022] In a preferred solution, a track vehicle is provided between the track and the electric hoist for driving the electric hoist to move in the direction of the track;

[0023] The rail vehicle comprises a connecting shaft for connecting the electric hoist, a mounting plate arranged on both sides of the connecting shaft, and at least one pair of rollers arranged on one side of the mounting plate corresponding to the rail;

[0024] A second motor is provided on the mounting plate, a first gear is coaxially provided on the roller near the second motor, a rotating shaft is connected to the second motor, a second gear is provided at one end of the rotating shaft, and the second gear is meshed with the first gear;

[0025] A second fixed shaft is arranged on the mounting plate, a second bearing is mounted on the second fixed shaft, and a roller is mounted on the second bearing; the track is an I-beam, and the rollers on the left and right sides are arranged oppositely, and an inclination matching the guide rail is arranged on the outer surface of the roller.

[0026] In the preferred solution, a stabilizing mechanism is also provided to prevent the tensioning jack from shaking back and forth;

[0027] The stabilizing mechanism includes a guide plate connected to the rail car, and a movable clamping plate is slidably connected to the guide plate;

[0028] The movable splint is provided with two fixing plates, which are located on both sides of the tensioning jack;

[0029] The tensioning jack is provided with a plurality of clamping parts, and the clamping part in the middle is provided with two symmetrical bosses, and the bosses are provided with connecting sleeves, and the connecting sleeves are connected to the bosses by bolts and matching nuts;

[0030] The connecting sleeve is provided with a positioning shaft, and the positioning shaft is rotated inside the fixing plate.

[0031] In a preferred solution, there are two movable splints, a connecting block and a plurality of guide wheels are provided between the two movable splints, the guide wheels are rotatably connected to the movable splints, and the guide wheels abut against the guide plates;

[0032] The end of the fixed plate is provided with a movable groove, and the positioning shaft is located inside the movable groove;

[0033] The ends of the fixed plate and the tensioning jack are both provided with sensors, and the sensors are used to detect the working position of the tensioning jack.

[0034] The preferred solution includes the following steps:

[0035] S1. The trolley chassis drives the trolley to move to the workstation, and the sensor detects the position of the steel strand in the workstation (x s ,y s ,z s );

[0036] Using triangulation method, three sensors A, B, and C are set up. The known coordinates of sensors A, B, and C are (x A ,y A ,z A )、(xB ,y B ,z B )、(x C ,y C ,z C ), according to the distance d from the sensor to the steel strand A ,d B ,d C , the strand positions are solved by the following set of equations:

[0037]

[0038] S2. According to the monitoring data, the rail car and electric hoist work to drive the tensioning jack to move to the location of the steel strand;

[0039] The moving distance of the rail vehicle is L1=v1t1, where t1 is the moving time, v1 is the moving speed of the rail vehicle, v1=2πnr / i, n is the speed of the second motor, i is the gear ratio of the second gear to the first gear, and r is the roller radius;

[0040] The tensioning jack moves a distance L2=v2t2 in the vertical direction, where t2 is the moving time, v2 is the lifting speed, v2=Pη / F, P is the motor output power of the electric hoist, F is the lifting force, and η is the working efficiency of the electric hoist;

[0041] S3. Use the tensioning mechanism to adjust the angle of the tensioning jack so that the steel strand can pass through the tensioning jack more smoothly and stabilize the position of the tensioning jack;

[0042] S4, the rail car and the electric hoist work to drive the tensioning jack to move, so that the steel strand passes through the tensioning jack;

[0043] S5. After tensioning is completed, start the rail car and electric hoist to remove the tensioning jack.

[0044] The preferred solution also includes the following steps:

[0045] S31, starting the first motor in the linear moving mechanism connected to the tensioning mechanism to drive the screw rod to rotate and adjust the position of the pull ring;

[0046] S32, the winch of the tensioning mechanism works to pull the connecting rope, drive the pull ring to move, and drive the tensioning jack to rotate a certain angle;

[0047] S33, an angle sensor is provided on the tensioning jack, the angle sensor detects the angle of the tensioning jack, the control unit determines that the angle of the tensioning jack is consistent with the angle of the steel strand, and stops the winch;

[0048] In S4, the position of the steel strand is first fixed, and the end of the steel strand has no burrs;

[0049] According to the angle β of the steel strand, when the rail car drives the tensioning jack to move a distance L, the electric hoist drives the tensioning jack to move L·tanβ;

[0050] During the movement, L1 and L2 are controlled by controlling n and P so that t1=t2, L=L1, and L·tanβ=L2.

[0051] The present invention provides a prestressed tendon tensioning auxiliary trolley, which has the following beneficial effects by adopting the above solution:

[0052] 1. It can prevent the tensioning jack of the trolley from shaking randomly, thus ensuring stability during work and making connection more convenient.

[0053] 2. The angle of the tensioning jack can be adjusted as needed to adapt to prestressed tendons at different angles and different usage requirements.

[0054] 3. It can automatically align the connection position, making the connection operation more convenient and efficient, and reducing the difficulty of connection.

[0055] 4. It can prevent the tensioning jack from colliding with equipment or workers, which is safer.

[0056] 5. When in use, it can stabilize the position of the connecting rope and ensure smooth movement, making it easier to adjust and control with higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0058] Figure 1 is a schematic diagram of the overall axial front view structure of an embodiment of the present invention;

[0059] Figure 2 is a schematic diagram of a side view structure of an embodiment of the present invention;

[0060] Figure 3 This is a schematic diagram of the lateral structure of the clamping member assembly according to an embodiment of the present invention;

[0061] Figure 4 This is a schematic diagram of the assembly shaft side structure of the clamping member according to an embodiment of the present invention;

[0062] Figure 5 This is a schematic diagram of the axial side structure of a support frame according to an embodiment of the present invention;

[0063] Figure 6 is a schematic diagram of a top view of the support frame according to an embodiment of the present invention;

[0064] Figure 7 It is a schematic diagram of the local structure of a rolling element in an embodiment of the present invention;

[0065] Figure 8 This is a schematic diagram of the rolling element installation structure of an embodiment of the present invention;

[0066] Fig. 9 This is a schematic diagram of the rail vehicle installation structure according to an embodiment of the present invention;

[0067] Fig.10 This is a schematic diagram of the structure of the rail vehicle axle side according to an embodiment of the present invention;

[0068] Fig.11 It is a schematic diagram of the structure of an embodiment of the present invention;

[0069] Fig.12 is a schematic side view of the structure of an embodiment of the clamping member of the present invention;

[0070] Fig.13 It is a schematic diagram of the top view of the stabilizing mechanism of the present invention.

[0071] Reference numerals: trolley chassis 11; frame 12; track 13; electric hoist 14; tensioning jack 15; tensioning mechanism 2; tensioner 21; connecting rope 22; clamping member 23; upper clamping member 231; lower clamping member 232; pull ring 24; protrusion 25; stepped hole 251; first bearing 252; tension sensor 26; boss 28; threaded hole 281; rolling mechanism 3; support frame 32; avoidance groove 321; guide seat 33; guide hole 332; wear-resistant ring 34; mounting seat 3 5; first fixed shaft 36; rolling element 37; second bearing 38; rail car 4; connecting shaft 41; mounting plate 42; roller 43; second motor 44; first gear 45; rotating shaft 46; second gear 47; second fixed shaft 48; linear moving mechanism 5; connecting seat 52; screw rod 53; first motor 55; stabilizing mechanism 6; guide plate 61; movable splint 62; fixing plate 63; connecting sleeve 64; positioning shaft 65; bolt 66; connecting block 67; guide wheel 68; movable groove 69. DETAILED DESCRIPTION

[0072] Embodiment 1:

[0073] See Figure 1-10 As shown, the present application provides a prestressed tendon tensioning auxiliary trolley, including a trolley chassis 11, a frame 12 arranged on the trolley chassis 11, a track 13 arranged above the frame 12, an electric hoist 14 arranged on the track 13 and movable along the track 13, and a tensioning jack 15 arranged below the electric hoist 14. A tensioning mechanism 2 is provided on the trolley chassis 11, and the tensioning mechanism 2 is arranged directly below the track 13. The tensioning mechanism 2 is used to pull the tensioning jack 15 to prevent the tensioning jack 15 from swinging left and right.

[0074] The trolley chassis 11 has four wheels and is an electrically controlled trolley, which is a prior art. The frame 12 is a frame structure built of square tubes. The track 13 is a single track and a cantilever structure. The area below the cantilever is convenient for workers to operate the tensioning jack 15. The tensioning mechanism 2 is arranged directly below the track 13 to limit the swing of the tensioning jack 15 to both sides of the track 13. Because when installing the tensioning jack 15, the worker just stands on one side of the tensioning jack 15, and the tensioning mechanism 2 is used to pull the bottom of the tensioning jack 15 to limit the left and right swing amplitude of the tensioning jack 15 during the rising and falling process, thereby preventing the tensioning jack 15 from injuring people or hitting the frame 12.

[0075] In a preferred solution, the tensioning mechanism 2 includes a tensioner 21 disposed on the trolley chassis 11, a connecting rope 22 disposed on the tensioner 21, a clamping member 23 is disposed in the length direction of the tensioning jack 15, and the connecting rope 22 is connected to the clamping member 23. A tension sensor 26 is also disposed on the connecting rope 22.

[0076] The purpose of setting the tension sensor 26 is to keep the connecting rope 22 in a tensioned state at all times. Preferably, a tension threshold is set in the system. When the tension value detected by the tension sensor 26 is less than the tension threshold, the tensioner 21 tightens the connecting rope 22. When the tension sensor 26 is greater than the tension threshold, the tensioner 21 remains in a tensioned state. The tensioner 21 is preferably a winch, and the connecting rope 22 is preferably a steel wire rope. The connecting rope 22 is tightened by rotating the drum.

[0077] The tension sensor 26 is preferably a tension sensor model FC-S88 produced by Shanghai Fels Sensor Co., Ltd., which is easy to install.

[0078] The entire tensioning mechanism 2 is preferably an elastic rope, and the tensioning jack 15 is stably fixed by balancing the elastic force of the elastic rope and the force of the electric hoist 14.

[0079] In the preferred embodiment, there are at least three clamping members 23, one of which is arranged in the middle of the tensioning jack 15, and the other is arranged at a certain distance from the clamping member 23 arranged in the middle. The electric hoist 14 is connected to the top of the clamping member 23 arranged in the middle of the tensioning jack 15, and a linear moving mechanism 5 is arranged between the two clamping members 23 on the left and right sides. The linear moving mechanism 5 includes a movable slider, a connecting seat 52 is provided on the slider, a pull ring 24 is provided on the connecting seat 52, and the connecting rope 22 is connected to the pull ring 24. The linear moving mechanism 5 can drive the slider to move, thereby driving the connection point between the pull ring 24 and the connecting rope 22 to move, so that the tensioning jack 15 can rotate around the connection point between the clamping member 23 in the middle and the electric hoist 14, and the alignment front end of the tensioning jack 15 is swung at a certain angle.

[0080] In actual work, the prestressed bundle is not always in a horizontal state. Therefore, the tensioning jack 15 needs to swing up and down at a certain angle to allow the prestressed bundle to pass through the hole of the tensioning jack 15. Therefore, a fixed connection point is set on the middle clamping piece 23, and a movable pull ring 24 is set on the left and right clamping pieces 23. When the pull ring 24 connected by the connecting rope 22 is in a vertical line with the electric hoist 14 connected to the middle clamping piece 23, the opening of the tensioning jack 15 is in a horizontal state. When the pull ring 24 is located on one side or the other, the tensioning jack 15 swings around the fixed point above due to the tension of the connecting rope 22.

[0081] In a preferred embodiment, a protrusion 25 is provided on one side below the two clamping members 23, and the linear moving mechanism 5 is arranged on the protrusion 25. The linear moving mechanism 5 also includes a screw rod 53 arranged between the two protrusions 25, and a slider is arranged on the screw rod 53. A stepped hole 251 is provided on the protrusion 25, and a first bearing 252 is provided in the stepped hole 251. The screw rod 53 is sleeved on the first bearing 252, and a first motor 55 is provided on one side of the protrusion 25, and the first motor 55 is connected to the screw rod 53 through a coupling.

[0082] In the preferred embodiment, the clamping member 23 includes an upper clamping member 231 and a lower clamping member 232. Both the upper clamping member 231 and the lower clamping member 232 have an arc structure that matches the shape of the tensioning jack 15. Bosses 28 are provided on both sides of the upper clamping member 231 and the lower clamping member 232. Threaded holes 281 are provided on the bosses 28. The upper clamping member 231 and the lower clamping member 232 are connected by installing screws in the threaded holes 281.

[0083] In the preferred solution, a V-shaped support frame 32 is further provided on the trolley, and the V-shaped support frame 32 is also arranged directly below the track 13. An avoidance groove 321 for avoiding the linear moving mechanism 5 is provided at the V-shaped bottom of the V-shaped support frame 32. A guide seat 33 is provided on one side of the V-shaped support frame 32, and a guide hole 332 is provided on the guide seat 33. The connecting rope 22 passes through the guide hole 332 and is connected to the pull ring 24.

[0084] The purpose of setting the V-shaped support frame 32 is to place the tensioning jack 15 on the V-shaped support frame 32 when the trolley is not working. The avoidance groove 321 facilitates the structure of avoiding the pull ring 24. After the work is completed, the connecting rope 22 is pulled back by the tensioning mechanism 2, and the electric hoist 14 lowers the tensioning jack 15, and then the tensioning jack 15 is moved to the V-shaped support frame 32 through the guiding effect of the guide hole 332, thereby reducing the participation of manual labor and reducing the intensity of manual operation.

[0085] In a preferred solution, the guide seat 33 is U-shaped, and wear-resistant rings 34 coaxial with the guide hole 332 and with an inner diameter smaller than the guide hole 332 are provided on both sides of the guide hole 332 , and the connecting rope 22 passes through the wear-resistant rings 34 .

[0086] The wear-resistant ring 34 is made of a wear-resistant material, such as copper, etc. The wear-resistant ring 34 plays a guiding role.

[0087] In the preferred embodiment, a plurality of rolling mechanisms 3 are provided on one side of the wear-resistant ring 34, and the rolling mechanism 3 surrounds the central hole of the wear-resistant ring 34 in the middle. The rolling mechanism 3 includes a mounting seat 35, a first fixed shaft 36 arranged between two mounting seats 35; a rolling body 37 mounted on the first fixed shaft 36, and a second bearing 38 installed between the rolling body 37 and the first fixed shaft 36.

[0088] The rolling bodies 37 are preferably arranged in four groups, and the distance between two corresponding rolling bodies 37 is smaller than the through hole of the wear-resistant ring 34, so that the sliding friction between the connecting rope and the wear-resistant ring 34 can be changed into rolling friction, thereby improving the life of the friction part components.

[0089] In a preferred embodiment, a rail car 4 is provided between the rail 13 and the electric hoist 14 for driving the electric hoist 14 to move in the direction of the rail 13. The rail car 4 includes a connecting shaft 41 for connecting the electric hoist 14; mounting plates 42 are provided on both sides of the connecting shaft 41, and at least one pair of rollers 43 are provided on the side corresponding to the mounting plate 42 and the rail 13. A second motor 44 is provided on the mounting plate 42, and a first gear 45 is coaxially provided on the roller 43 close to the second motor 44. A rotating shaft 46 is connected to the second motor 44, and a second gear 47 is provided at one end of the rotating shaft 46, and the second gear 47 is meshed with the first gear 45.

[0090] The second motor 44 drives the first gear 45 to rotate via the second gear 47 , and the roller 43 rotates accordingly, so that the roller 43 moves back and forth on the track 13 .

[0091] In the preferred solution, a second fixed shaft 48 is provided on the mounting plate 42, a second bearing 38 is mounted on the second fixed shaft 48, and a roller 43 is mounted on the second bearing 38; the track 13 is an I-beam, and the rollers 43 on the left and right sides are arranged opposite to each other, and a slope matching the guide rail is provided on the outer surface of the roller 43; the trolley chassis 11 is an electric flat chassis; the tensioner 21 is a winch, and the connecting rope 22 is wound around the winch.

[0092] The track 13 is an I-beam, and the rollers 43 on the left and right sides are arranged opposite to each other. The outer surfaces of the rollers 43 are provided with a slope matching the guide rail.

[0093] Embodiment 2:

[0094] like Figure 11-13 As shown, a stabilizing mechanism 6 is also provided to prevent the tensioning jack 15 from shaking back and forth;

[0095] The stabilizing mechanism 6 comprises a guide plate 61 connected to the rail vehicle 4, and a movable clamping plate 62 is slidably connected to the guide plate 61;

[0096] The movable splint 62 is provided with two fixing plates 63, and the fixing plates 63 are located on both sides of the tensioning jack 15;

[0097] The tensioning jack 15 is provided with a plurality of clamping members 23, and the clamping member 23 in the middle is provided with two symmetrical bosses 28, and the bosses 28 are provided with connecting sleeves 64, and the connecting sleeves 64 are connected to the bosses 28 by bolts 66 and matching nuts;

[0098] The connecting sleeve 64 is provided with a positioning shaft 65, and the positioning shaft 65 is rotated inside the fixing plate 63;

[0099] When in use, the electric hoist 14 normally drives the tensioning jack 15 to rise and fall. During this process, the tensioning jack 15 will drive the fixed plate 63 and the movable splint 62 to rise and fall along the guide plate 61 through the clamping piece 23, the connecting sleeve 64 and the positioning shaft 65, which will not affect the lifting and falling of the tensioning jack 15. The position of the tensioning jack 15 can be limited by the fixed plate 63 to prevent the tensioning jack 15 from shaking back and forth.

[0100] In the preferred solution, there are two movable splints 62, and a connecting block 67 and a plurality of guide wheels 68 are provided between the two movable splints 62. The guide wheels 68 are rotatably connected to the movable splints 62, and the guide wheels 68 abut against the guide plate 61. The sliding of the movable splint 62 is guided by the guide wheels 68 to ensure the smooth sliding of the movable splint 62.

[0101] The end of the fixed plate 63 is provided with a movable groove 69, and the positioning shaft 65 is located inside the movable groove 69. When the tensioning jack 15 needs to be disassembled, the positioning shaft 65 is slid out along the movable groove 69, so that the tensioning jack 15 can be moved away from the fixed plate 63 to complete the disassembly;

[0102] Sensors are provided at the ends of the fixing plate 63 and the ends of the tensioning jack 15. The sensors are used to detect the working position of the tensioning jack 15. The sensors are preferably position detection sensors, angle sensors, laser sensors or ultrasonic sensors, which are used to detect the angle of the tensioning jack 15 and the position of the steel strand. The steel strand refers to the prestressed bundle that cooperates with the tensioning jack 15. In the prestressed tensioning technology, the tensioning jack 15 generally cooperates with the steel strand to apply prestress.

[0103] When the angle of the tensioning jack 15 needs to be adjusted, the position of the connecting seat 52 is moved as in the process of the above embodiment. Figure 3As shown, when the connecting seat 52 moves to the left side, the connecting rope 22 is pulled by the winch, which can drive the tensioning jack 15 to rotate counterclockwise around the positioning shaft 65; when the connecting seat 52 moves to the right side, the connecting rope 22 is pulled by the winch, which can drive the tensioning jack 15 to rotate clockwise around the positioning shaft 65, thereby adjusting the angle of the tensioning jack 15, which is simple to operate and easy to adjust.

[0104] Embodiment 3:

[0105] The following steps are included:

[0106] S1, the trolley chassis 11 drives the trolley to move to the work station, and the sensor detects the position of the steel strand in the work station (x s ,y s ,z s );

[0107] Using triangulation method, three sensors A, B, and C are set up. The known coordinates of sensors A, B, and C are (x A ,y A ,z A )、(x B ,y B ,z B )、(x C ,y C ,z C ), according to the distance d from the sensor to the steel strand A d B d C , the strand positions are solved by the following set of equations:

[0108]

[0109] S2. According to the monitoring data, the rail car 4 and the electric hoist 14 work to drive the tensioning jack 15 to move to the position where the steel strand is located;

[0110] The moving distance of the rail vehicle L1=v1t1, where t1 is the moving time, v1 is the moving speed of the rail vehicle, v1=2πnr / i, n is the speed of the second motor 44, i is the gear ratio of the second gear 47 to the first gear 45, and r is the radius of the roller 43;

[0111] The tensioning jack moves a distance L2=v2t2 in the vertical direction, where t2 is the moving time, v2 is the lifting speed, v2=Pη / F, P is the motor output power of the electric hoist 14, F is the lifting force, and η is the working efficiency of the electric hoist 14;

[0112] S3, using the tensioning mechanism 2 to adjust the angle of the tensioning jack 15, so that the steel strand can pass through the tensioning jack 15 more smoothly, and stabilize the position of the tensioning jack 15;

[0113] S4, rail car 4 and electric hoist 14 work, driving the tensioning jack 15 to move, so that the steel strand passes through the tensioning jack 15;

[0114] S5, after the tensioning is completed, the rail car 4 and the electric hoist 14 are started to remove the tensioning jack 15.

[0115] The preferred solution also includes the following steps:

[0116] S31, starting the first motor 55 in the linear moving mechanism 5 connected to the tensioning mechanism 2 to drive the screw rod 53 to rotate, and adjusting the position of the pull ring 24;

[0117] S32, the winch of the tensioning mechanism 2 works to pull the connecting rope 22, drive the pull ring 24 to move, and drive the tensioning jack 15 to rotate a certain angle;

[0118] S33, an angle sensor is provided on the tensioning jack 15, the angle sensor detects the angle of the tensioning jack 15, the control unit determines that the angle of the tensioning jack 15 is consistent with the angle of the steel strand, and stops the winch;

[0119] In S4, the position of the steel strand is first fixed, and the end of the steel strand has no burrs;

[0120] According to the angle β of the steel strand, when the rail car 4 drives the tensioning jack 15 to move a distance L, the electric hoist 14 drives the tensioning jack 15 to move L·tanβ;

[0121] During the movement, L1 and L2 are controlled by controlling n and P, so that t1 = t2, L = L1, and L·tanβ = L2;

[0122] The above method can facilitate the trolley to automatically adjust the position of the tensioning jack 15, so that the tensioning jack 15 can be connected to the steel strand more quickly and efficiently, without the need for manual real-time adjustment of the position of the tensioning jack 15, thereby reducing the difficulty of connection and increasing work efficiency.

[0123] The sensors and motors of the present application are all connected to an existing control unit, such as a control chip or a PLC, and use existing methods to transmit signals, connect and control.

[0124] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A prestressed tendon tensioning auxiliary trolley, characterized in that: The invention comprises a trolley chassis (11), a frame (12) arranged on the trolley chassis (11), a track (13) arranged above the frame (12), a rail vehicle (4) arranged on the track (13) and movable along the track (13), an electric hoist (14) arranged below the rail vehicle (4), and a tensioning jack (15) arranged below the electric hoist (14). A tensioning mechanism (2) is arranged on the trolley chassis (11), the tensioning mechanism (2) is arranged directly below the track (13), and the tensioning mechanism (2) is used to pull the tensioning jack (15) to prevent the tensioning jack (15) from swinging left and right.

2. The prestressed tendon tensioning auxiliary trolley according to claim 1, characterized in that: The tensioning mechanism (2) comprises a tensioner (21) arranged on the trolley chassis (11), a connecting rope (22) arranged on the tensioner (21), a clamping member (23) provided in the length direction on the tensioning jack (15), and the connecting rope (22) is connected to the clamping member (23); The trolley chassis (11) is an electric flat chassis; The tensioner (21) is a winch, and the connecting rope (22) is wound around the winch.

3. The prestressed tendon tensioning auxiliary trolley according to claim 1, characterized in that: At least three holding members (23) are provided, one of which is arranged in the middle of the tensioning jack (15), and another is arranged at a certain distance from the holding member (23) arranged in the middle; The electric hoist (14) is connected to the upper part of the clamping member (23) arranged in the middle of the tensioning jack (15); A linear moving mechanism (5) is provided between the two holding members (23) on the left and right sides, the linear moving mechanism (5) comprising a movable slider, a connecting seat (52) is provided on the slider, a pull ring (24) is provided on the connecting seat (52), and the connecting rope (22) is connected to the pull ring (24); A tension sensor (26) is provided on the connecting rope (22); The linear moving mechanism (5) can drive the slider to move, thereby driving the connection point between the pull ring (24) and the connection rope (22) to move, so that the tensioning jack (15) can rotate around the connection point between the central clamping member (23) and the electric hoist (14), and the alignment front end of the tensioning jack (15) can swing at a certain angle; A protrusion (25) is provided on one side below the two clasping members (23), and a linear motion mechanism (5) is arranged on the protrusion (25). The linear motion mechanism (5) further comprises a screw rod (53) arranged between the two protrusions (25), and a slider is arranged on the screw rod (53); A stepped hole (251) is provided on the protrusion (25), a first bearing (252) is provided in the stepped hole (251), a screw rod (53) is sleeved on the first bearing (252), a first motor (55) is provided on one side of the protrusion (25), and the first motor (55) is connected to the screw rod (53) via a coupling.

4. The prestressed tendon tensioning auxiliary trolley according to claim 2, characterized in that: The clamping member (23) comprises an upper clamping member (231) and a lower clamping member (232), and both the upper clamping member (231) and the lower clamping member (232) have an arc structure matching the appearance of the tensioning jack (15), and bosses (28) are provided on both sides of the upper clamping member (231) and the lower clamping member (232), and threaded holes (281) are provided on the bosses (28), and the upper clamping member (231) and the lower clamping member (232) are connected by installing screws in the threaded holes (281).

5. The prestressed tendon tensioning auxiliary trolley according to claim 2, characterized in that: A V-shaped support frame (32) is also provided on the trolley. The V-shaped support frame (32) is also arranged directly below the track (13). An avoidance groove (321) for avoiding the linear moving mechanism (5) is provided at the V-shaped bottom of the V-shaped support frame (32). A guide seat (33) is arranged on one side of the V-shaped support frame (32), a guide hole (332) is arranged on the guide seat (33), and the connecting rope (22) passes through the guide hole (332) and is connected to the pull ring (24); The guide seat (33) is U-shaped, and wear-resistant rings (34) coaxial with the guide hole (332) and having an inner diameter smaller than that of the guide hole (332) are provided on both sides of the guide hole (332), and the connecting rope (22) passes through the wear-resistant rings (34); A plurality of rolling mechanisms (3) are arranged on one side of the wear-resistant ring (34), the rolling mechanisms (3) surround the central hole of the wear-resistant ring (34) in the middle, and the rolling mechanisms (3) include a mounting seat (35), a first fixed shaft (36) arranged between two mounting seats (35); a rolling body (37) mounted on the first fixed shaft (36), and a second bearing (38) installed between the rolling body (37) and the first fixed shaft (36).

6. The prestressed tendon tensioning auxiliary trolley according to claim 1, characterized in that: A track vehicle (4) is provided between the track (13) and the electric hoist (14) for driving the electric hoist (14) to move in the direction of the track (13); The rail vehicle (4) comprises a connecting shaft (41) for connecting to an electric hoist (14), mounting plates (42) arranged on both sides of the connecting shaft (41), and at least one pair of rollers (43) arranged on one side of the mounting plate (42) corresponding to the rail (13); A second motor (44) is provided on the mounting plate (42); a first gear (45) is coaxially provided on the roller (43) near the second motor (44); a rotating shaft (46) is connected to the second motor (44); a second gear (47) is provided at one end of the rotating shaft (46); and the second gear (47) is meshed with the first gear (45); A second fixed shaft (48) is provided on the mounting plate (42), a second bearing (38) is sleeved on the second fixed shaft (48), and a roller (43) is sleeved on the second bearing (38); the track (13) is an I-beam, and the rollers (43) on the left and right sides are arranged opposite to each other, and an inclination matching the guide rail is provided on the outer surface of the roller (43).

7. The prestressed tendon tensioning auxiliary trolley according to claim 1, characterized in that: A stabilizing mechanism (6) is also provided to prevent the tensioning jack (15) from shaking back and forth; The stabilizing mechanism (6) comprises a guide plate (61) connected to the rail vehicle (4), and a movable clamping plate (62) is slidably connected to the guide plate (61); The movable clamping plate (62) is provided with two fixing plates (63), and the fixing plates (63) are located on both sides of the tensioning jack (15); The tensioning jack (15) is provided with a plurality of clamping members (23), the clamping member (23) in the middle is provided with two symmetrical bosses (28), the bosses (28) are provided with connecting sleeves (64), and the connecting sleeves (64) are connected to the bosses (28) by bolts (66) and matching nuts; The connecting sleeve (64) is provided with a positioning shaft (65), and the positioning shaft (65) is rotated inside the fixing plate (63).

8. The prestressed tendon tensioning auxiliary trolley according to claim 1, characterized in that: There are two movable splints (62), a connecting block (67) and a plurality of guide wheels (68) are provided between the two movable splints (62), the guide wheels (68) are rotatably connected to the movable splints (62), and the guide wheels (68) abut against the guide plates (61); An active groove (69) is provided at the end of the fixed plate (63), and the positioning shaft (65) is located inside the active groove (69); The ends of the fixing plate (63) and the ends of the tensioning jack (15) are both provided with sensors, and the sensors are used to detect the working position of the tensioning jack (15).

9. A prestressed tendon tensioning auxiliary trolley according to any one of claims 1 to 8, characterized in that: The following steps are included: S1, the trolley chassis (11) drives the trolley to move to the work station, and the sensor detects the position of the steel strand in the work station (x s ,y s ,z s ); Using triangulation method, three sensors A, B, and C are set up. The known coordinates of sensors A, B, and C are (x A ,y A ,z A )、(x B ,y B ,z B )、(x C ,y C ,z C ), according to the distance d from the sensor to the steel strand A d B d C , the strand positions are solved by the following set of equations: S2. According to the monitored data, the rail car (4) and the electric hoist (14) work to drive the tensioning jack (15) to move to the position where the steel strand is located; The moving distance of the rail vehicle L1=v1t1, wherein t1 is the moving time, v1 is the moving speed of the rail vehicle, v1=2πnr / i, n is the rotation speed of the second motor (44), i is the gear ratio of the second gear (47) to the first gear (45), and r is the radius of the roller (43); The tensioning jack moves a distance L2=v2t2 in the vertical direction, wherein t2 is the moving time, v2 is the lifting speed, v2=Pη / F, P is the motor output power of the electric hoist (14), F is the lifting force, and η is the working efficiency of the electric hoist (14); S3, using the tensioning mechanism (2) to adjust the angle of the tensioning jack (15), so that the steel strand can pass through the tensioning jack (15) more smoothly, and stabilize the position of the tensioning jack (15); S4, the rail car (4) and the electric hoist (14) work, driving the tensioning jack (15) to move, so that the steel strand passes through the tensioning jack (15); S5, after the tensioning is completed, the rail car (4) and the electric hoist (14) are started to remove the tensioning jack (15).

10. The prestressed tendon tensioning auxiliary trolley according to claim 9, characterized in that: The following steps are also included: S31, starting the first motor (55) in the linear moving mechanism (5) connected to the tensioning mechanism (2) to drive the screw rod (53) to rotate and adjust the position of the pull ring (24); S32, the winch of the tensioning mechanism (2) works to pull the connecting rope (22), drive the pull ring (24) to move, and drive the tensioning jack (15) to rotate a certain angle; S33, an angle sensor is provided on the tensioning jack (15), the angle sensor detects the angle of the tensioning jack (15), the control unit determines that the angle of the tensioning jack (15) is consistent with the angle of the steel strand, and stops the winch; In S4, the position of the steel strand is first fixed, and the end of the steel strand has no burrs; According to the angle β of the steel strand, when the rail car (4) drives the tensioning jack (15) to move a distance L, the electric hoist (14) drives the tensioning jack (15) to move L·tanβ; During the movement, L1 and L2 are controlled by controlling n and P so that t1=t2, L=L1, and L·tanβ=L2.

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