Prestress tensioning device for bridge construction

Abstract

The invention relates to the technical field of bridge construction, and particularly discloses a prestress tensioning device for bridge construction. A frame is arranged on the top surface of the vehicle body; a sliding plate is slidably mounted on the inner side wall of the frame body; a tensioning jack capable of tensioning the bridge steel strand is arranged on the top surface of the sliding plate; a lifting mechanism capable of enabling the sliding plate to slide in the vertical direction is arranged on the frame body; an adjusting mechanism capable of adjusting the position and the angle of the tensioning jack is arranged on the sliding plate; when the steel strand extending out of the bridge end has the left-right drooping phenomenon, the left-right swinging angle and the pitching angle of the tensioning jack can be adjusted through the adjusting mechanism, the tensioning jack is made to be aligned with the bridge steel strand, and the steel strand can be conveniently inserted into the tensioning jack to conduct prestress tensioning work.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to a prestressed tensioning device for bridge construction. Background Art

[0002] At present, in the process of bridge construction, due to the limited length of the beams and slabs, the formation of the bridge often requires the splicing of multiple beams and slabs. In order to improve the firmness and service life of the bridge, the beams and slabs need to be prestressed. Prestressing is to add tension to the components in advance, so that the prestressed components are subjected to compressive stress, thereby causing them to produce a certain deformation to cope with the load on the structure itself.

[0003] In the prior art, a tensioning trolley is often used to carry out prestressing tensioning work on bridges. However, the existing tensioning trolley can only simply adjust the position of the tensioning jack when threading the steel strand, and it is inconvenient to adjust the handover of the tensioning jack. When the steel strand at the bridge end deviates in direction due to construction errors, it is inconvenient for workers to thread the steel strand. Summary of the invention

[0004] The present application provides a prestressed tensioning device for bridge construction, which can conveniently adjust the position and angle of the tensioning jack, and facilitate the threading of steel strands for prestressed tensioning work.

[0005] The present application provides a prestressed tensioning device for bridge construction, which adopts the following technical solution: A prestressed tensioning device for bridge construction comprises a vehicle body; a frame is arranged on the top surface of the vehicle body; a slide plate is slidably mounted on the inner wall of the frame; a tensioning jack for tensioning bridge steel strands is arranged on the top surface of the slide plate; a lifting mechanism for enabling the slide plate to slide in a vertical direction is arranged on the frame; an adjusting mechanism is arranged on the slide plate; the adjusting mechanism can realize the adjustment of the position and angle of the tensioning jack.

[0006] By adopting the above technical scheme, when carrying out the prestressed tensioning construction of the bridge, the vehicle body is moved to the bottom of the protruding end of the bridge steel strand, and the sliding plate is driven to move by the lifting mechanism arranged on the frame, so that the tensioning jack arranged on the top of the sliding plate is moved to an appropriate height, and then the adjusting mechanism is used to adjust the position and angle of the tensioning jack, so that the tensioning jack can be aligned with the protruding steel strand on the bridge, so that the bridge steel strand can be smoothly inserted into the tensioning jack for prestressed tensioning work, thereby improving the efficiency of the prestressed tensioning work of the bridge steel strand.

[0007] Preferably, a through groove is provided on the top surface of the skateboard; the adjusting mechanism includes a first motor, a first slider and a box body; the first motor is installed on the outer wall of the skateboard, and the output end of the first motor is coaxially fixed with a screw rod extending into the through groove; the first slider is sleeved on the outer wall of the screw rod, the first slider is threadedly matched with the screw rod, and the first slider is slidingly matched with the inner wall of the through groove; the box body is fixed to the top surface of the first slider, the box body is slidingly matched with the top surface of the skateboard, and a cover plate is hinged on the top side wall of the box body; the tensioning jack is installed on the top surface of the cover plate; a pushing assembly capable of lifting the cover plate is provided in the box body; a rotating assembly capable of rotating the frame is provided on the vehicle body.

[0008] By adopting the above technical solution, when the slide plate drives the tensioning jack to move to a suitable height, the first motor is started to drive the screw to rotate, so that the first slider drives the box body to move along the axial direction of the screw to adjust the position of the tensioning jack. When the steel strands extending outward from the bridge end droop to the left and right, the tensioning jack can be adjusted in the left and right swing angles and the upward tilt angles through the cooperation of the rotating component and the pushing component, so that the tensioning jack is aligned with the bridge steel strands, which facilitates the insertion of the steel strands into the tensioning jack for prestressing work.

[0009] Preferably, the pushing assembly includes a first hydraulic cylinder; the first hydraulic cylinder is vertically mounted on the inner wall of the bottom end of the box body, and a first piston rod in contact with the bottom surface of the cover plate is disposed at the output end of the first hydraulic cylinder.

[0010] By adopting the above technical solution, when the first hydraulic cylinder is started to drive the first piston rod to extend, the end of the first piston rod will slide along the bottom surface of the cover plate and lift the cover plate, causing the tensioning jack set on the top surface of the cover plate to gradually rise up, and the upward angle of the tensioning jack is adjusted so that the tensioning jack can be aligned with the steel strand drooping from the end surface of the bridge, making it convenient for the steel strand to be inserted into the tensioning jack for tensioning work.

[0011] Preferably, a slide groove is provided on the bottom surface of the cover plate; a first sphere extending into the slide groove is fixedly connected to the top end of the first piston rod; and the first sphere is slidably matched with the inner side wall of the slide groove.

[0012] By adopting the above technical solution, during the process of the first piston rod driving the first piston rod to rise and fall, the first sphere will slide along the inner wall of the slide groove. The cooperation between the first sphere and the inner wall of the slide groove can increase the contact area between the first piston rod and the cover plate when the first piston rod extends the cover plate, thereby improving the stability of the first piston rod when lifting the cover plate, and also reducing the friction resistance when the first piston rod lifts the cover plate, making it convenient to adjust the lifting angle of the tensioning jack.

[0013] Preferably, the rotating assembly includes a second motor; the second motor is vertically mounted on the bottom surface of the vehicle body, and the output end of the first motor is coaxially fixed with a rotating shaft extending to the top of the vehicle body and fixed with the bottom surface of the frame.

[0014] By adopting the above technical solution, starting the second motor to drive the rotating shaft to rotate can synchronously drive the frame to rotate, so that the tensioning jack can swing left and right, so that the left and right deflection angles of the tensioning jack can be aligned with the left and right deflection angles of the steel strand, making it convenient for the steel strand to be inserted into the tensioning jack for prestressing work.

[0015] Preferably, the top surface of the vehicle body is provided with a plurality of grooves located at the bottom of the frame; a second sphere is provided in each of the grooves; the second sphere rolls with the inner wall of the groove, and the top of the second sphere contacts the bottom surface of the frame outside the groove.

[0016] By adopting the above technical solution, the second ball arranged in the groove can support the frame to ensure the stability of the frame. When the second motor drives the frame to rotate, the second ball can roll in the groove, thereby reducing the friction resistance of the second motor when driving the frame to rotate.

[0017] Preferably, the lifting mechanism comprises a plurality of electric hoists; the plurality of electric hoists are evenly distributed on the top surface of the frame located on both sides of the slide, and each electric hoist is provided with a sling; one end of the sling away from the electric hoist is fixedly connected to the top surface of the slide.

[0018] By adopting the above technical solution, when the vehicle body is moved to the vicinity of the bridge to carry out steel strand tensioning work, the electric hoist is started to reel in the sling, and the sling drives the slide plate to move upward in the vertical direction during the reeling process, thereby adjusting the height position of the tensioning jack, so that the tensioning jack can be extended to a suitable height to insert the steel strand for bridge prestressing tensioning work.

[0019] Preferably, a limiting groove arranged along the vertical direction is opened on the side wall of the frame close to the slide; a limiting block inserted into the limiting groove is fixedly connected to the side wall of the slide close to the limiting groove; the limiting block is slidably matched with the inner side wall of the limiting groove.

[0020] By adopting the above technical solution, when the slide plate is raised or lowered in the vertical direction to adjust the height position of the tensioning jack, the limit block will slide along the inner wall of the limit groove, and the movement of the slide plate will be guided and limited through the cooperation between the limit block and the inner wall of the limit groove, thereby reducing the possibility of shaking and deflecting of the slide plate and improving the stability of the slide plate during the lifting and moving process.

[0021] Preferably, a second hydraulic cylinder arranged vertically is provided on the outer side wall of the vehicle body; a second piston rod pointing vertically downward is provided at the delivery end of the second hydraulic cylinder; and a pressure plate is fixedly connected to the bottom end of the second piston rod.

[0022] By adopting the above technical solution, when the vehicle body is moved to a designated position to tension the steel strands of the bridge, the second hydraulic cylinder drives the second piston rod to move downward, so as to cause the pressure plate at the bottom of the second piston rod to move downward and press tightly against the bottom surface, thereby improving the stability of the vehicle body and reducing the possibility of movement of the vehicle body.

[0023] Preferably, a rubber pad is provided on the bottom surface of the pressing plate.

[0024] By adopting the above technical solution, when the pressure plate moves down and is pressed on the ground, the rubber pad on the bottom of the pressure plate can increase the friction between the pressure plate and the ground, improve the pressing effect of the pressure plate on the ground, and improve the stability of the vehicle body during the tensioning process.

[0025] In summary, this application has the following beneficial effects: 1. When the slide plate drives the tensioning jack to move to a suitable height, the first motor is started to drive the screw rod to rotate, so that the first slider drives the box body to move along the axial direction of the screw rod, and the position of the tensioning jack is adjusted to match the position of the extended end of the steel strand to insert the steel strand. When the steel strand extending outward from the bridge end droops to the left and right, the tensioning jack can be adjusted in the left and right swing angle and the upward tilt angle through the cooperation of the rotating component and the jacking component, so that the tensioning jack is aligned with the bridge steel strand, which is convenient for the steel strand to be inserted into the tensioning jack for prestressing work; 2. When the vehicle body is moved to the designated position to tension the steel strands of the bridge, the second hydraulic cylinder is started to drive the second piston rod to move downward, so that the pressure plate at the bottom of the second piston rod moves downward and presses on the bottom surface, thereby improving the stability of the vehicle body and reducing the possibility of movement of the vehicle body; 3. When the pressure plate moves down and is pressed on the ground, the rubber pad on the bottom of the pressure plate can increase the friction between the pressure plate and the ground, improve the pressing effect of the pressure plate on the ground, and thus improve the stability of the vehicle body during the tensioning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a prestressed tensioning device for bridge construction; Figure 2 It is a schematic diagram of the coordination structure of the frame, the slide plate and the lifting mechanism in this application; Figure 3 It is a schematic diagram of the matching structure of the slide plate, the first slide block and the box body in the present application; Figure 4 It is a schematic diagram of the exploded structure of the vehicle body, frame and rotating assembly in this application; Figure 5 It is a schematic diagram of the matching structure of the box body, the cover plate and the push assembly in this application; Figure 6 It is a schematic diagram of the matching structure of the second hydraulic cylinder and the pressure plate in this application.

[0027] Explanation of the reference numerals in the accompanying drawings: 1. body; 11. groove; 2. frame; 21. limit groove; 3. slide plate; 31. through groove; 32. limit block; 4. tensioning jack; 5. lifting mechanism; 51. electric hoist; 52. sling; 6. adjustment mechanism; 61. first motor; 62. first slider; 63. box body; 64. screw rod; 65. cover plate; 651. slide groove; 66. push assembly; 661. first hydraulic cylinder; 662. first piston rod; 663. first sphere; 67. rotating assembly; 671. second motor; 672. rotating shaft; 673. second sphere; 7. second hydraulic cylinder; 71. second piston rod; 72. pressure plate; 721. rubber pad. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "bottom" and "top" used in the following description refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] The present invention discloses a prestressed tensioning device for bridge construction, such as Figure 1 and Figure 2 As shown, it includes a vehicle body 1, a frame 2, a skateboard 3, a tensioning jack 4 and a lifting mechanism 5. The frame 2 is installed on the top surface of the vehicle body 1, and the skateboard 3 is horizontally installed inside the frame 2. The skateboard 3 slides with the inner wall of the frame 2. The tensioning jack 4 is horizontally installed on the top surface of the skateboard 3. The tensioning jack 4 can tension the bridge steel strands inserted therein. The tensioning jack 4 is a prior art, and its specific composition structure is no longer repeated. The lifting mechanism 5 is arranged on the top surface of the frame 2. The lifting mechanism 5 can drive the skateboard 3 to be lifted and lowered in the vertical direction. The lifting mechanism 5 includes four electric hoists 51. The four electric hoists 51 are respectively installed on the top surface of the frame 2 on both sides away from each other of the skateboard 3. Each electric hoist 51 is provided with a sling 52, and the ends of the sling 52 away from the electric hoist 51 are fixedly connected to the top surface of the skateboard 3.

[0030] When carrying out the prestressed tensioning construction of the bridge, the vehicle body 1 is moved to the bottom of the protruding end of the bridge steel strand, and the electric hoist 51 installed on the frame 2 is started to reel in the sling 52. During the reeling process, the sling 52 will drive the slide plate 3 to move up in the vertical direction, so that the tensioning jack 4 is lifted to the height position of the bridge steel strand, so as to further adjust the position and angle of the tensioning jack 4 and then install the steel strand.

[0031] like Figure 2 and Figure 3As shown, two limit blocks 32 are fixedly connected to the two side walls of the slide plate 3 that are far away from each other, and limit grooves 21 arranged along the vertical direction are opened on the side walls of the frame 2 corresponding to the positions of the limit blocks 32. The four limit blocks 32 are respectively inserted into the four limit grooves 21 and slideably cooperate with the inner walls of the limit grooves 21. The limit blocks 32 and the limit grooves 21 are in a dovetail shape that cooperate with each other.

[0032] When the sling 52 drives the skateboard 3 to rise and fall in the vertical direction, the limit block 32 will slide in the vertical direction along the inner wall of the limit groove 21. The movement of the skateboard 3 is guided and limited through the cooperation between the dovetail-shaped limit block 32 and the limit groove 21, thereby reducing the possibility of the skateboard 3 shaking and deviating when the sling 52 drives the skateboard 3 to move, and improving the stability of the lifting and lowering movement of the skateboard 3.

[0033] like Figure 1 , Figure 3 and Figure 4 As shown, the slide plate 3 is provided with an adjustment mechanism 6 for adjusting the position and angle of the tensioning jack 4. The adjustment mechanism 6 includes a first motor 61, a first slider 62, a box body 63, a push assembly 66 and a rotating assembly 67. A through slot 31 is provided on the top surface of the slide plate 3. The first motor 61 is horizontally mounted on the outer wall of the slide plate 3 near one end of the through slot 31. A screw rod 64 extending into the through slot 31 is coaxially fixed to the output end of the first motor 61. The screw rod 64 is rotatably matched with the inner wall of the through slot 31. The first slider 62 is sleeved on the screw rod 64. The outer wall is threadedly matched with the screw rod 64, the first slider 62 is slidably matched with the inner wall of the through groove 31, the box body 63 is arranged on the top surface of the slide plate 3, the bottom surface of the box body 63 is fixedly connected to the top surface of the first slider 62, and a cover plate 65 is hinged on the outer wall at the top end of the box body 63. The tensioning jack 4 is horizontally installed on the top surface of the cover plate 65. The pushing assembly 66 is arranged inside the box body 63. The pushing assembly 66 can lift the cover plate 65 to lift the tensioning jack 4. The rotating assembly 67 is arranged at the bottom of the frame 2, and the rotating assembly 67 can drive the frame 2 to rotate.

[0034] When the slide plate 3 drives the tensioning jack 4 to move to a suitable height, the first motor 61 is started to drive the screw rod 64 to rotate, so that the first slider 62 drives the box body 63 to move axially along the screw rod 64, and the position of the tensioning jack 4 is adjusted to cooperate with the position of the protruding end of the steel strand to insert the steel strand. When the steel strand protruding from the bridge end droops left and right, the tensioning jack 4 can be adjusted in the left and right swing angle and the upward angle through the cooperation of the rotating component 67 and the pushing component 66, so as to align the tensioning jack 4 with the bridge steel strand, and facilitate the insertion of the steel strand into the tensioning jack 4 for prestressing.

[0035] like Figure 1 and Figure 4As shown, the rotating assembly 67 includes a second motor 671 and a plurality of second spheres 673. The second motor 671 is vertically mounted on the bottom surface of the vehicle body 1. The output end of the second motor 671 is coaxially fixed with a rotating shaft 672 that penetrates the vehicle body 1, extends to the top of the vehicle body 1 and is fixed to the bottom surface of the frame 2. The rotating shaft 672 rotates with the vehicle body 1. A plurality of grooves 11 arranged around the rotating shaft 672 are provided on the top surface of the vehicle body 1. The plurality of grooves 11 are evenly arranged circumferentially along the rotating shaft 672. A plurality of second spheres 673 are respectively arranged in the plurality of grooves 11. The second spheres 673 roll with the inner walls of the grooves 11. The top end of each second sphere 673 extends to the top of the vehicle body 1 and contacts the bottom surface of the frame 2.

[0036] When the left and right deflection angle of the tensioning jack 4 is adjusted, the second motor 671 is started to drive the frame 2 to rotate synchronously through the rotating shaft 672, so that the tensioning jack 4 deflects left and right with the frame 2, so that the left and right deflection angle of the tensioning jack 4 can be aligned with the left and right deflection angle of the steel strand. The second sphere 673 arranged on the vehicle body 1 can provide support for the frame 2 when the frame 2 is in a stationary state. During the rotation of the frame 2, the second sphere 673 will roll in the groove 11, thereby reducing the friction resistance when the second motor 671 drives the frame 2 to rotate, so as to realize the adjustment of the left and right deflection angle of the tensioning jack 4.

[0037] like Figure 1 , Figure 3 and Figure 5 As shown, the pushing assembly 66 includes a pair of first hydraulic cylinders 661 and a pair of first spheres 663. The pair of first hydraulic cylinders 661 are vertically installed on the inner wall of the bottom end of the box body 63. The output ends of the two first hydraulic cylinders 661 are both provided with first piston rods 662. The pair of first spheres 663 are respectively fixedly connected to the top ends of the two first piston rods 662. A pair of slide grooves 651 are provided on the bottom surface of the cover plate 65. The top ends of the two first spheres 663 extend into the two slide grooves 651 respectively, and the first spheres 663 slide in cooperation with the inner walls of the slide grooves 651.

[0038] When the upward inclination angle of the tensioning jack 4 is adjusted, the first hydraulic cylinder 661 is started to drive the first piston rod 662 to extend, causing the first sphere 663 at the end of the first piston rod 662 to slide along the inner wall of the slide groove 651 and lift the cover plate 65, causing the cover plate 65 to be lifted up to adjust the upward inclination angle of the tensioning jack 4, so that the upward inclination angle of the tensioning jack 4 can match the drooping angle of the steel strand. The cooperation between the first sphere 663 and the inner wall of the slide groove 651 not only improves the lifting stability, but also reduces the friction resistance of the first piston rod 662 pushing the cover plate 65, thereby facilitating the adjustment of the upward inclination angle of the tensioning jack 4.

[0039] like Figure 1 and Figure 6As shown, a group of vertically arranged second hydraulic cylinders 7 are fixedly connected to the outer wall of the vehicle body 1, and the group of second hydraulic cylinders 7 are evenly distributed along the outer periphery of the vehicle body 1. A second piston rod 71 pointing vertically downward is provided at the output end of each second hydraulic cylinder 7, and a pressure plate 72 is fixedly connected to the bottom end of the second piston rod 71, and a rubber pad 721 is fixedly connected to the bottom surface of the pressure plate 72.

[0040] When the vehicle body 1 is moved to the end where the bridge steel strands are extended for prestressing tensioning, the second hydraulic cylinder 7 is started to drive the second hydraulic cylinder 7 to move downward, causing the pressure plate 72 to be pressed against the ground. The provision of the rubber pad 721 increases the friction between the pressure plate 72 and the ground, thereby improving the pressing effect of the pressure plate 72 on the ground. The multiple pressure plates 72 arranged around the vehicle body 1 cooperate to support and stabilize the vehicle body 1, thereby reducing the possibility of movement of the vehicle body 1 during the prestressing tensioning process and improving the stability of the vehicle body 1.

[0041] Working principle: When carrying out the prestressed tensioning construction of the bridge, the vehicle body 1 is moved to the bottom of the protruding end of the bridge steel strand, and the electric hoist 51 provided on the frame body 2 is started to reel the sling 52. During the reeling process, the sling 52 will drive the slide plate 3 to move up in the vertical direction, so that the tensioning jack 4 is lifted to the height position where the bridge steel strand is located, and then the first motor 61 is started to drive the screw rod 64 to rotate. During the rotation of the screw rod 64, the first slider 62 will drive the box body 63 to move along the axial direction of the screw rod 64, thereby further adjusting the position of the tensioning jack 4, so that the tensioning jack 4 can be moved to the protruding end of the bridge steel strand; When the steel strand at the protruding end of the bridge droops left and right due to construction errors, the second motor 671 can be started to drive the rotating shaft 672 to rotate, so that the frame 2 drives the tensioning jack 4 to swing left and right, and then the first hydraulic cylinder 661 can be started to drive the first piston rod 662 to extend, so that the first ball 663 at the end of the first piston rod 662 slides along the inner wall of the slide groove 651 and lifts the cover plate 65, so that the cover plate 65 is tilted up to adjust the upward tilt angle of the tensioning jack 4, thereby adjusting the left and right deflection angle and the upward tilt angle of the tensioning jack 4, so that the tensioning jack 4 can be aligned with the steel strand drooping left and right at the protruding end of the bridge, so as to facilitate the insertion of the steel strand into the tensioning jack 4 to perform the prestressing work of the bridge; When the steel strand tensioning work is carried out, the second hydraulic cylinder 7 can be started to drive the second hydraulic cylinder 7 to move downward, so that the pressure plate 72 arranged at the bottom of the second hydraulic cylinder 7 is pressed tightly against the ground. Through the cooperation of multiple pressure plates 72 arranged around the vehicle body 1 and pressed tightly against the ground, the vehicle body 1 is supported and stabilized, thereby improving the stability of the vehicle body 1 and reducing the possibility of movement of the vehicle body 1 during the steel strand tensioning process.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A prestressed tensioning device for bridge construction, characterized in that: The invention comprises a vehicle body (1); a frame (2) is arranged on the top surface of the vehicle body (1); a slide plate (3) is slidably mounted on the inner wall of the frame (2); a tensioning jack (4) capable of tensioning bridge steel strands is arranged on the top surface of the slide plate (3); a lifting mechanism (5) capable of enabling the slide plate (3) to slide in a vertical direction is arranged on the frame (2); an adjusting mechanism (6) is arranged on the slide plate (3); the adjusting mechanism (6) can adjust the position and angle of the tensioning jack (4).

2. A prestressed tensioning device for bridge construction according to claim 1, characterized in that: The top surface of the slide plate (3) is provided with a through slot (31); the adjustment mechanism (6) comprises a first motor (61), a first slider (62) and a box body (63); the first motor (61) is mounted on the outer wall of the slide plate (3); the output end of the first motor (61) is coaxially fixedly connected with a screw rod (64) extending into the through slot (31); the first slider (62) is sleeved on the outer wall of the screw rod (64); the first slider (62) and the screw rod (64) are threadedly matched; the first slider (63) The box body (63) is fixedly connected to the top surface of the first slider (62), the box body (63) is slidably matched with the top surface of the slide plate (3), and a cover plate (65) is hinged on the top side wall of the box body (63); the tensioning jack (4) is installed on the top surface of the cover plate (65); a pushing assembly (66) capable of lifting the cover plate (65) is arranged in the box body (63); and a rotating assembly (67) capable of rotating the frame body (2) is arranged on the vehicle body (1).

3. A prestressed tensioning device for bridge construction according to claim 2, characterized in that: The pushing assembly (66) comprises a first hydraulic cylinder (661); the first hydraulic cylinder (661) is vertically mounted on the inner wall of the bottom end of the box body (63); and a first piston rod (662) in contact with the bottom surface of the cover plate (65) is disposed at the output end of the first hydraulic cylinder (661).

4. A prestressed tensioning device for bridge construction according to claim 3, characterized in that: The bottom surface of the cover plate (65) is provided with a slide groove (651); the top end of the first piston rod (662) is fixedly connected with a first ball (663) extending into the slide groove (651); the first ball (663) is slidably matched with the inner wall of the slide groove (651).

5. The prestressed tensioning device for bridge construction according to claim 2, characterized in that: The rotating assembly (67) comprises a second motor (671); the second motor (671) is vertically mounted on the bottom surface of the vehicle body (1); the output end of the first motor (61) is coaxially fixedly connected to a rotating shaft (672) extending to the top of the vehicle body (1) and fixedly connected to the bottom surface of the frame (2).

6. A prestressed tensioning device for bridge construction according to claim 5, characterized in that: The top surface of the vehicle body (1) is provided with a plurality of grooves (11) located at the bottom of the frame body (2); a second sphere (673) is provided in each of the grooves (11); the second sphere (673) is in rolling engagement with the inner side wall of the groove (11), and the top of the second sphere (673) is provided with contact with the bottom surface of the frame body (2) outside the groove (11).

7. The prestressed tensioning device for bridge construction according to claim 1, characterized in that: The lifting mechanism (5) comprises a plurality of electric hoists (51); the plurality of electric hoists (51) are evenly installed on the top surface of the frame (2) located on both sides of the slide plate (3); each electric hoist (51) is provided with a sling (52); one end of the sling (52) away from the electric hoist (51) is fixedly connected to the top surface of the slide plate (3).

8. A prestressed tensioning device for bridge construction according to claim 7, characterized in that: A limiting groove (21) arranged in the vertical direction is provided on the side wall of the frame (2) close to the slide plate (3); a limiting block (32) is fixedly connected to the side wall of the slide plate (3) close to the limiting groove (21) and is inserted into the limiting groove (21); the limiting block (32) is slidably matched with the inner side wall of the limiting groove (21).

9. The prestressed tensioning device for bridge construction according to claim 1, characterized in that: A second hydraulic cylinder (7) arranged vertically is provided on the outer side wall of the vehicle body (1); a second piston rod (71) pointing vertically downward is provided at the delivery end of the second hydraulic cylinder (7); and a pressure plate (72) is fixedly connected to the bottom end of the second piston rod (71).

10. A prestressed tensioning device for bridge construction according to claim 9, characterized in that: A rubber pad (721) is provided on the bottom surface of the pressing plate (72).

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