Cast-in-place box girder steel strand pulling device and pulling method

Abstract

The invention discloses a cast-in-place box girder steel strand pulling device and method, and particularly relates to the technical field of steel strand installation, the cast-in-place box girder steel strand pulling device comprises a base, a supporting assembly is arranged on the base, the supporting assembly comprises a supporting frame arranged at the top of the base, and a plurality of position-adjustable supporting blocks are distributed on the supporting frame. The steel strands are prevented from being staggered together, meanwhile, the rotating rods can be located on the outer sides of the steel strands, the function of supporting the steel strands is achieved, the friction force between the steel strands and the second bunching sleeve and the friction force between the steel strands and the first bunching sleeve are reduced when the steel strands are pulled, the stability and convenience of single steel strand penetrating are improved, the steel strands easily penetrate through the corrugated pipe, and the steel strand penetrating efficiency is improved. The steel strand tensioning device has the advantages that the tensioning control stress of a single steel strand is improved, and the steel strand is prevented from being snapped.

Description

Technical Field

[0001] The present invention relates to the technical field of steel strand installation, and more specifically, to a steel strand bundle threading device and a bundle threading method for a cast-in-place box girder. Background Art

[0002] The cast-in-place box girder strand threading device is mainly used to thread the prestressed steel strands into the corrugated pipes in the cast-in-place box girder, which is an important link in the prestressed construction of large-scale building structures such as bridges and tunnels. Through this device, it can ensure that the steel strands pass through the corrugated pipes accurately and efficiently.

[0003] Among them, the patent with announcement number CN215407487U discloses a cast-in-place box girder steel strand threading device with simple and convenient construction, including a motor and a reducer connected to each other, a steel strand, a steel strand guide head and a buckling head, one end of the steel strand is connected to the output shaft of the reducer through the buckling head, and the steel strand guide head is arranged at the other end of the steel strand; When this structure is in use, the steel strands are driven to rotate by the cooperation of the motor and the reducer, so that the steel strands can pass through corrugated pipes with long distances and complex spatial curves. Through the rapid rotation of the steel strands, the prestressed bundle threading work can be completed in the shortest time with guaranteed quality and quantity, avoiding the situation of twisting and breaking of wires during the tensioning process. However, this structure is not easy to comb the steel strands when in use, which makes it easy for them to be intertwined during wiring installation. At the same time, it is not easy to perform proper tensioning adjustment on each steel strand individually, and the prestressed bundle threading work effect is not good when in use. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a cast-in-place box girder steel strand threading device and threading method, aiming to solve the problems raised in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: a cast-in-place box girder steel strand threading device, comprising a base, on which a support assembly is arranged; The support assembly comprises a support frame arranged on the top of the base, a plurality of position-adjustable support blocks are distributed on the support frame, and a support ring for cable harness is fixedly arranged on each of the support blocks, a position-adjustable extension frame is arranged on one side of the support ring, an angle-adjustable hinge plate is arranged on one side of the extension frame, a plurality of support rods are fixedly arranged on the hinge plate, and a slide groove is penetrated through each of the support rods; A plurality of the slide grooves are slidably connected with a lower extension rod, and the bottom end of the lower extension rod is tilted downward, the bottom end of the lower extension rod is hinged with a first harness sleeve, the first harness sleeve is hinged with a second harness sleeve, one end of the second harness sleeve is rotatably connected to two rotating rods, a pull-down frame is fixedly provided at the bottom of the support rod, a plurality of electric push rods are hinged on the pull-down frame, and an articulated frame is fixedly provided at the output end of each of the electric push rods, a plurality of articulated frames are articulated with an articulated block, and one end of each articulated block extends to the corresponding first harness sleeve, and the articulated block is detachably connected to the first harness sleeve by a bolt; It can be seen that in the above technical solution, after being constrained by the support ring, each steel strand is respectively passed through the corresponding first harness sleeve and the second harness sleeve, so as to realize the function of combing the steel strand constrained by the support ring, and avoid the steel strands from being staggered together. At the same time, the rotating rod can be located on the outside of the steel strand, so as to realize the function of supporting the steel strand, reduce the friction between the steel strand and the second harness sleeve and the first harness sleeve when the steel strand is pulled, improve the stability and convenience of the single steel strand when the strand is bundled, and facilitate the steel strand to pass through the corrugated tube, the articulated frame and the articulated block to move, and then the first harness sleeve can be adjusted at an angle at the bottom end of the lower extension rod by the traction force when the articulated frame and the articulated block are displaced, so that the steel strand is twisted, and the second harness sleeve can contact the outside of the twisted area of ​​the steel strand, so as to realize the function of limiting the position when the tightness of the steel strand is adjusted; Optionally, in a possible embodiment, the outer side of the support ring is rotatably connected to two slides, and each of the slides extends to the extension frame, the slide is slidably connected to the extension frame, one end of the slide is threadedly connected to a limit knob, the limit knob passes through the extension frame and extends to one side of the extension frame, one end of the extension frame is fixedly provided with a hinged cover, the hinged cover is provided on a hinge plate and is hinged to the hinge plate, the top of the base is rotatably connected to a swivel, the swivel is rotatably connected to a first bevel gear, the middle part of the first bevel gear is rotatably connected to a vertical cylinder, the bottom end of the vertical cylinder passes through the first bevel gear and is fixed to the swivel, and a number of handles are inserted into the outer side of the first bevel gear , a plurality of second bevel gears are distributed on the first bevel gear, and each of the second bevel gears is respectively located on one side of the corresponding support block, the second bevel gear is meshed with the first bevel gear, a screw is fixedly provided at one end of the second bevel gear, the screw is threadedly connected to the support block, one end of the screw is rotatably connected to a guide rod, the guide rod passes through the support block and is inserted into the vertical cylinder, the support block is slidably connected to the guide rod, a hydraulic rod is hinged on the base, a traction member is hinged at the output end of the hydraulic rod, one end of the traction member is hinged to a constraint belt, the constraint belt is located on the outside of the swivel, one end of the constraint belt is mounted on the base by a bolt, and the traction member is rotatably connected to the base; It can be seen that in the above technical solution, the articulated cover, the articulated plate and the structures on the support rod make circular motion along the axis point of the support ring, and the steel strands constrained in the middle of the support ring are twisted together, which is convenient for uniform force distribution when the steel strands are subjected to force, improves the tensioning control stress of the single steel strand, and avoids the steel strand from being broken. The limit knob can also be rotated counterclockwise to make the slide plate and the extension frame lose the limit. The extension frame can be adjusted on the slide plate, which is easy to adjust the length of the area where the steel strands can be twisted together, so that the second bevel gear drives the screw to rotate, so that the support block can be displaced on the guide rod, so that each support block can be close to or away from the axis point of the support frame, which is convenient for tensioning and adjusting the steel strand. The constraint belt spreads outward, so that the swivel loses the limit on the base, and then the swivel can rotate, realizing the function of adjusting the angle of each support block facing the outside of the support frame, thereby improving the convenience of threading the steel strands.

[0006] A stranding method, using the above cast-in-place box girder steel strand stranding device, comprises the following steps: Step 1: The staff installs the device at the designated position. When threading the steel strands, the steel strands are passed through the base, the swivel, the first bevel gear and the vertical cylinder from the bottom of the base and extended into the support ring respectively. The support ring constrains the steel strands, and then each steel strand is passed through the corresponding first harness sleeve and the second harness sleeve respectively, so as to realize the function of combing the steel strands constrained by the support ring and avoid the steel strands from being staggered. At the same time, the rotating rod can also be located on the outside of the steel strand to realize the function of supporting the steel strand, reduce the friction between the steel strand and the second harness sleeve and the first harness sleeve when the steel strand is pulled, improve the stability and convenience of the single steel strand when threading the bundle, and facilitate the steel strand to pass through the corrugated pipe; Step 2: After the electric push rod is started, the output end of the electric push rod extends to drive the hinge frame and the hinge block to move, so that the first harness sleeve can adjust the angle at the bottom end of the lower extension rod through the traction force when the hinge frame and the hinge block are moved, so that the steel strand is twisted, and the second harness sleeve can contact the outside of the twisted area of ​​the steel strand, so as to realize the function of limiting the position when adjusting the tightness of the steel strand; Step three, the extension frame and the slide plate can be rotated at the same time, so that the hinged cover, the hinged plate and the structures on the support rod can make circular motion along the axis point of the support ring, and the steel strands constrained in the middle of the support ring can be twisted together, which is convenient for the steel strands to be evenly distributed when they are stressed, improve the tension control stress of a single steel strand, and avoid the steel strands from being broken. The limit knob can also be rotated counterclockwise to make the slide plate and the extension frame lose the limit, and the extension frame can be adjusted on the slide plate, which is easy to adjust the length of the area where the steel strands can be twisted together; Step 4: The first bevel gear can be rotated by rotating the handle, and then the second bevel gear can drive the screw to rotate, so that the support block can be displaced on the guide rod, so that each support block can be close to or away from the axis point of the support frame, which is convenient for tensioning and adjusting the steel strand; Step five: The output end of the hydraulic rod extends to deflect the traction puller, which in turn causes the restraint belt to spread outward, causing the swivel to lose its limit on the base, and then allows the swivel to rotate, thereby achieving the function of adjusting the angle of each support block facing the outside of the support frame, thereby improving the convenience of threading the steel strands.

[0007] Technical effects and advantages of the present invention: 1. The present invention constrains the steel strands through the support ring, and then passes each steel strand through the corresponding first cable sleeve and the second cable sleeve, so as to realize the function of combing the steel strands constrained by the support ring, and avoid the steel strands from being staggered together. At the same time, the rotating rod can be located outside the steel strands to realize the function of supporting the steel strands, reduce the friction between the steel strands and the second cable sleeve and the first cable sleeve when they are pulled, improve the stability and convenience of a single steel strand when it is bundled, and facilitate the steel strands to pass through the corrugated pipe; 2. The present invention extends the output end of the electric push rod to drive the hinge frame and the hinge block to move, so that the first harness sleeve can be adjusted at the bottom end of the lower extension rod by the traction force when the hinge frame and the hinge block are moved, so that the steel strand is twisted, and the second harness sleeve can contact the outside of the twisted area of ​​the steel strand, so as to realize the function of limiting the position when adjusting the tightness of the steel strand; 3. The present invention makes the hinged cover, hinged plate and various structures on the support rod move in a circle along the axis point of the support ring, so as to twist the various steel strands constrained in the middle of the support ring together, which facilitates the uniform distribution of force when the steel strands are subjected to force, improves the tension control stress of a single steel strand, and avoids the steel strand from being broken. The limit knob can also be rotated counterclockwise to make the slide plate and the extension frame lose the limit, and the extension frame can be adjusted on the slide plate, so that the length of the area where the steel strands can be twisted together can be easily adjusted; 4. The present invention drives the screw to rotate through the second bevel gear, so that the support block can be displaced on the guide rod, so that each support block can be close to or away from the axis point of the support frame, which is convenient for adjusting the tension of the steel strand. By deflecting the traction puller, the restraint belt spreads outward, so that the swivel loses its limit on the base, and then the swivel can rotate, realizing the function of adjusting the angle of each support block facing the outside of the support frame, and improving the convenience of steel strand bundle threading; To sum up, the overall design is simple and the structure is reasonable. Through the corresponding cooperation of various structures, each steel strand is respectively passed through the corresponding first wire harness sleeve and the second wire harness sleeve, so as to realize the function of combing the steel strand constrained by the support ring, avoid the staggered steel strands, and at the same time, the rotating rod can be located on the outside of the steel strand to realize the function of supporting the steel strand, reduce the friction between the steel strand and the second wire harness sleeve and the first wire harness sleeve when pulling, improve the stability and convenience of single steel strand when passing the bundle, and make it easy for the steel strand to pass through the corrugated tube. The traction force when the hinge frame and the hinge block are displaced is adjusted at the bottom end of the lower extension rod to make the steel strand twist. bend, and the second cable bundle can resist the outside of the twisted area of ​​the steel strand, so as to realize the function of limiting the steel strand when adjusting the tightness. The hinged cover, the hinged plate and the structures on the support rod make circular motion along the axis point of the support ring, and twist the steel strands constrained in the middle of the support ring together, so as to facilitate the uniform distribution of force when the steel strand is subjected to force, improve the tensioning control stress of a single steel strand, and avoid the steel strand being broken. Moreover, each support block can be close to or away from the axis point of the support frame, so as to facilitate the tension adjustment of the steel strand, and can be rotated through the swivel to realize the function of adjusting the angle of each support block facing the outside of the support frame, thereby improving the convenience of threading the steel strand. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required for use in some embodiments. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not intended to limit the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0009] Figure 1 It is a top view of the overall structure of the present invention.

[0010] Figure 2 A side view of a support assembly provided by the present invention.

[0011] Figure 3 A stereoscopic diagram of the support frame, vertical cylinder, support block, first bevel gear, hydraulic rod and traction pull member provided by the present invention.

[0012] Figure 4 A three-dimensional diagram of the support frame, vertical cylinder, support block, lead screw, second bevel gear and guide rod provided by the present invention.

[0013] Figure 5 A stereoscopic diagram of the first bevel gear, swivel, base, hydraulic rod, traction pull and restraint belt provided by the present invention.

[0014] Figure 6A three-dimensional diagram of the support ring, the extension frame, the hinged cover, the support rod, the lower extension rod, the second cable tie sleeve and the first cable tie sleeve provided by the present invention.

[0015] Figure 7 A three-dimensional diagram of the support ring, extension frame, slide plate, limit knob and hinged cover provided by the present invention.

[0016] Figure 8 A three-dimensional diagram of the hinged plate, support rod, pull-down frame, electric push rod and hinged frame provided by the present invention.

[0017] Fig. 9 A stereoscopic diagram of the lower extension rod, the first cable tie sleeve, the second cable tie sleeve and the rotating rod provided by the present invention.

[0018] The accompanying drawings are marked as follows: 1. base; 2. support frame; 3. support block; 4. support ring; 5. extension frame; 6. hinged plate; 7. support rod; 8. slide groove; 9. lower extension rod; 10. first harness sleeve; 11. second harness sleeve; 12. rotating rod; 13. pull-down frame; 14. electric push rod; 15. hinge frame; 16. hinge block; 17. slide plate; 18. limit knob; 19. hinge cover; 20. swivel; 21. first bevel gear; 22. vertical cylinder; 23. screw rod; 24. second bevel gear; 25. guide rod; 26. handle; 27. hydraulic rod; 28. traction pull piece; 29. ​​restraint belt. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] As attached Figure 1 - Fig. 9The steel strand threading device for a cast-in-place box girder shown in the figure passes each steel strand through the corresponding first wire harness sleeve 10 and the second wire harness sleeve 11 through the support assembly arranged on the base 1, so as to realize the function of combing the steel strand constrained by the support ring 4 and avoid the steel strands from being staggered together. At the same time, the rotating rod 12 can also be located on the outside of the steel strand to realize the function of supporting the steel strand, reduce the friction between the steel strand and the second wire harness sleeve 11 and the first wire harness sleeve 10 when the steel strand is pulled, improve the stability and convenience of the single steel strand when threading the bundle, and facilitate the steel strand to pass through the corrugated tube. The traction force when the hinge frame 15 and the hinge block 16 are displaced is adjusted at the bottom end of the lower extension rod 9, so that the steel strand is twisted, and the second The cable sleeve 11 can contact the outside of the twisted area of ​​the steel strand, and realize the function of limiting the position when adjusting the tightness of the steel strand. The hinged cover 19, the hinged plate 6 and the support rod 7 make circular motions along the axis of the support ring 4, and the steel strands constrained in the middle of the support ring 4 are twisted together, which is convenient for the uniform distribution of force when the steel strand is stressed, improves the tension control stress of a single steel strand, and avoids the steel strand from being broken. Each support block 3 can be close to or away from the axis of the support frame 2, which is convenient for tensioning and adjusting the steel strand. The swivel 20 can be rotated to realize the function of adjusting the angle of each support block 3 facing the outside of the support frame 2, which improves the convenience of threading the steel strand, and the specific structure of the component is set as follows; The support assembly includes a support frame 2 arranged on the top of the base 1, and a plurality of position-adjustable support blocks 3 are distributed on the support frame 2, and each support block 3 is fixedly provided with a support ring 4 for wiring, and a position-adjustable extension frame 5 is arranged on one side of the support ring 4, and an angle-adjustable hinge plate 6 is arranged on one side of the extension frame 5, and a plurality of support rods 7 are fixedly arranged on the hinge plate 6, and each support rod 7 is penetrated by a slide groove 8.

[0021] A plurality of slide grooves 8 are slidably connected with lower extension rods 9, and the bottom end of the lower extension rod 9 is tilted downward, a first wiring harness sleeve 10 is hinged at the bottom end of the lower extension rod 9, a second wiring harness sleeve 11 is hinged on the first wiring harness sleeve 10, one end of the second wiring harness sleeve 11 is rotatably connected to two rotating rods 12, a pull-down frame 13 is fixedly provided at the bottom of the support rod 7, a plurality of electric push rods 14 are hinged on the pull-down frame 13, and an articulated frame 15 is fixedly provided at the output end of each electric push rod 14, a plurality of articulated frames 15 are articulated with an articulated block 16, and one end of each articulated block 16 extends to the corresponding first wiring harness sleeve 10, and the articulated block 16 is detachably connected to the first wiring harness sleeve 10 by bolts.

[0022] The outer side of the support ring 4 is rotatably connected to two slides 17, and each slide 17 extends to the extension frame 5. The slide 17 is slidably connected to the extension frame 5. One end of the slide 17 is threadedly connected to a limit knob 18, which passes through the extension frame 5 and extends to one side of the extension frame 5. One end of the extension frame 5 is fixedly provided with a hinged cover 19, which is provided on the hinged plate 6 and hinged to the hinged plate 6. The top of the base 1 is rotatably connected to a swivel 20, and the swivel 20 is rotatably connected to a first bevel gear 21. The middle part of the first bevel gear 21 is rotatably connected to a vertical cylinder 22, and the bottom end of the vertical cylinder 22 passes through the first bevel gear 21 and is fixed to the swivel 20. A plurality of handles 26 are inserted on the outer side of the first bevel gear 21. A plurality of second bevel gears 24 are arranged, and each second bevel gear 24 is respectively located on one side of the corresponding support block 3, the second bevel gear 24 is meshed with the first bevel gear 21, a screw rod 23 is fixedly provided at one end of the second bevel gear 24, the screw rod 23 is threadedly connected to the support block 3, one end of the screw rod 23 is rotatably connected to a guide rod 25, the guide rod 25 penetrates the support block 3 and is inserted on the vertical cylinder 22, the support block 3 is slidably connected to the guide rod 25, a hydraulic rod 27 is hinged on the base 1, a traction member 28 is hinged on the output end of the hydraulic rod 27, one end of the traction member 28 is hinged to a restraint belt 29, the restraint belt 29 is located on the outside of the swivel 20, one end of the restraint belt 29 is mounted on the base 1 by bolts, and the traction member 28 is rotatably connected to the base 1.

[0023] A stranding method, using the above cast-in-place box girder steel strand stranding device, comprises the following steps: Step one, the staff installs the device at the designated position. When the steel strands are bundled, the steel strands are passed from the bottom of the base 1 through the base 1, the swivel 20, the first bevel gear 21 and the vertical cylinder 22 and extended into the support ring 4 respectively. After being constrained by the support ring 4, each steel strand is then passed through the corresponding first harness sleeve 10 and the second harness sleeve 11 respectively, so as to realize the function of combing the steel strands constrained by the support ring 4 and avoid the steel strands being staggered together. At the same time, the rotating rod 12 can also be located on the outside of the steel strand to realize the function of supporting the steel strand, reduce the friction between the steel strand and the second harness sleeve 11 and the first harness sleeve 10 when the steel strand is pulled, improve the stability and convenience of a single steel strand when bundled, and facilitate the steel strand to pass through the corrugated tube.

[0024] Step two, the electric push rod 14 is started, and the output end of the electric push rod 14 extends to drive the hinge frame 15 and the hinge block 16 to move, so that the first wire sleeve 10 can adjust the angle at the bottom end of the lower extension rod 9 through the traction force when the hinge frame 15 and the hinge block 16 are moved, so that the steel strand is twisted, and the second wire sleeve 11 can contact the outside of the twisted area of ​​the steel strand, realizing the function of limiting the tightness of the steel strand.

[0025] Step three, the extension frame 5 and the slide plate 17 can be rotated at the same time, so that the various structures on the hinged cover 19, the hinged plate 6 and the support rod 7 make circular motion along the axis point of the support ring 4, and the various steel strands constrained in the middle of the support ring 4 are twisted together, which is convenient for the uniform distribution of force when the steel strands are subjected to force, improves the tensioning control stress of the single steel strand, and avoids the steel strand from being broken. The limit knob 18 can also be rotated counterclockwise to make the slide plate 17 and the extension frame 5 lose the limit, and the extension frame 5 can be adjusted on the slide plate 17, which is easy to adjust the length of the area where the steel strands can be twisted together.

[0026] In step four, the first bevel gear 21 can be driven to rotate by rotating the handle 26, and then the second bevel gear 24 drives the screw rod 23 to rotate, so that the support block 3 can be displaced on the guide rod 25, so that each support block 3 can be close to or away from the axis point of the support frame 2, which is convenient for tensioning and adjusting the steel strand.

[0027] Step five, the output end of the hydraulic rod 27 is extended to deflect the traction pull piece 28, and then the restraint belt 29 spreads outward, so that the swivel 20 loses its limit on the base 1, and then the swivel 20 can rotate, thereby realizing the function of adjusting the angle of each support block 3 facing the outside of the support frame 2, thereby improving the convenience of threading the steel strands.

[0028] According to the above structure, when in use, the steel strands are passed through the base 1, the swivel 20, the first bevel gear 21 and the vertical cylinder 22 from the bottom of the base 1 and extended into the support ring 4 respectively, and constrained by the support ring 4. Then, each steel strand is passed through the corresponding first cable sleeve 10 and the second cable sleeve 11 respectively, so as to realize the function of combing the steel strands constrained by the support ring 4. At the same time, the rotating rod 12 can also be located on the outside of the steel strands, which is convenient for the steel strands to pass through the corrugated tube. The output end of the electric push rod 14 extends to drive the articulated frame 15 and the articulated block 16 to move, so that the first cable sleeve 10 can be adjusted in angle at the bottom end of the lower extension rod 9, and the second cable sleeve 11 can contact the outside of the twisted area of ​​the steel strands.

[0029] At the same time, the extension frame 5 and the slide plate 17 can be rotated to twist the steel strands constrained in the middle of the support ring 4 together, and the limit knob 18 is rotated counterclockwise to make the slide plate 17 and the extension frame 5 lose their limits. The extension frame 5 can be adjusted on the slide plate 17, and the second bevel gear 24 drives the screw rod 23 to rotate, so that the support block 3 can be displaced on the guide rod 25, so that each support block 3 can be close to or away from the axis point of the support frame 2, and the traction pull piece 28 extended from the output end of the hydraulic rod 27 is deflected, thereby making the constraint belt 29 spread outward, and then making the swivel 20 able to rotate, thereby realizing the function of adjusting the angle of each support block 3 facing the outside of the support frame 2.

[0030] Different from the prior art, the present application discloses a strand threading device for a cast-in-place box girder, which realizes the function of combing the steel strands constrained by the support ring 4 by respectively passing each steel strand through the corresponding first wire harness sleeve 10 and second wire harness sleeve 11, thereby avoiding the steel strands from being staggered together. At the same time, the rotating rod 12 can also be located on the outside of the steel strand to realize the function of supporting the steel strand, reduce the friction between the steel strand and the second wire harness sleeve 11 and the first wire harness sleeve 10 when the steel strand is pulled, improve the stability and convenience of single steel strand threading, and facilitate the steel strand to pass through the corrugated tube. The traction force during the displacement of the hinge frame 15 and the hinge block 16 is adjusted at an angle at the bottom end of the lower extension rod 9, so that the steel strand can be easily threaded. The second cable sheath 11 can resist the outside of the twisted area of ​​the steel strand, realizing the function of limiting the steel strand when adjusting the tightness. The hinged cover 19, the hinged plate 6 and the support rod 7 make circular motions along the axis of the support ring 4, and twist the steel strands constrained in the middle of the support ring 4 together, which is convenient for uniform force distribution when the steel strand is subjected to force, improves the tensioning control stress of a single steel strand, and avoids the steel strand from being broken. Moreover, each support block 3 can be close to or away from the axis of the support frame 2, which is convenient for tensioning and adjusting the steel strand. The swivel 20 can be rotated to realize the function of adjusting the angle of each support block 3 facing the outside of the support frame 2, thereby improving the convenience of threading the steel strand.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cast-in-place box girder steel strand threading device, comprising a base (1), characterized in that: A supporting assembly is provided on the base (1); The support assembly comprises a support frame (2) arranged on the top of the base (1), a plurality of positionally adjustable support blocks (3) are distributed on the support frame (2), and a support ring (4) is fixedly arranged on each of the support blocks (3), an extension frame (5) is arranged on one side of the support ring (4), a hinge plate (6) is arranged on one side of the extension frame (5), a plurality of support rods (7) are fixedly arranged on the hinge plate (6), and a slide groove (8) is penetrated through each of the support rods (7); A plurality of the slide grooves (8) are slidably connected to a lower extension rod (9), a first cable harness (10) is hingedly connected to the bottom end of the lower extension rod (9), a second cable harness (11) is hingedly connected to the first cable harness (10), and one end of the second cable harness (11) is rotatably connected to two rotating rods (12).

2. The cast-in-place box girder steel strand threading device according to claim 1 is characterized in that: A pull-down frame (13) is fixedly provided at the bottom of the support rod (7), a plurality of electric push rods (14) are hingedly connected to the pull-down frame (13), and a hinged frame (15) is fixedly provided at the output end of each electric push rod (14).

3. The cast-in-place box girder steel strand threading device according to claim 2 is characterized in that: A plurality of the hinged frames (15) are hingedly connected to hinge blocks (16), and one end of each hinge block (16) extends to a corresponding first harness sleeve (10), and the hinge block (16) and the first harness sleeve (10) are detachably connected via bolts.

4. The cast-in-place box girder steel strand threading device according to claim 3 is characterized in that: Two slide plates (17) are rotatably connected to the outer side of the support ring (4), and each of the slide plates (17) extends to the extension frame (5). The slide plates (17) are slidably connected to the extension frame (5), and one end of the slide plate (17) is threadedly connected to a limit knob (18), and the limit knob (18) passes through the extension frame (5) and extends to one side of the extension frame (5).

5. The cast-in-place box girder steel strand threading device according to claim 4 is characterized in that: A hinged cover (19) is fixedly provided at one end of the extension frame (5); the hinged cover (19) is provided on the hinged plate (6) and is hingedly connected to the hinged plate (6).

6. The cast-in-place box girder steel strand threading device according to claim 5, characterized in that: The top of the base (1) is rotatably connected to a rotating ring (20), the rotating ring (20) is rotatably connected to a first bevel gear (21), the middle of the first bevel gear (21) is rotatably connected to a vertical cylinder (22), the bottom end of the vertical cylinder (22) passes through the first bevel gear (21) and is fixed to the rotating ring (20), and a plurality of handles (26) are inserted on the outer side of the first bevel gear (21).

7. The cast-in-place box girder steel strand threading device according to claim 6, characterized in that: A plurality of second bevel gears (24) are distributed on the first bevel gear (21), and each of the second bevel gears (24) is located on one side of a corresponding support block (3), and the second bevel gear (24) is meshed with the first bevel gear (21).

8. The cast-in-place box girder steel strand threading device according to claim 7, characterized in that: A screw rod (23) is fixedly provided at one end of the second bevel gear (24), the screw rod (23) being threadedly connected to the support block (3), one end of the screw rod (23) being rotatably connected to a guide rod (25), the guide rod (25) passing through the support block (3) and being plugged into the vertical cylinder (22), the support block (3) being slidably connected to the guide rod (25).

9. The cast-in-place box girder steel strand threading device according to claim 8, characterized in that: A hydraulic rod (27) is hingedly connected to the base (1); a traction member (28) is hingedly connected to the output end of the hydraulic rod (27); a restraining belt (29) is hingedly connected to one end of the traction member (28); the restraining belt (29) is located outside the swivel (20); one end of the restraining belt (29) is mounted on the base (1) by means of bolts; and the traction member (28) is rotatably connected to the base (1).

10. A stranding method, using the cast-in-place box girder steel stranding device according to claim 9, characterized in that: The following steps are included: Step 1: When the steel strands are bundled, the steel strands are passed through the base (1), the rotating ring (20), the first bevel gear (21) and the vertical cylinder (22) from the bottom of the base (1) and are respectively extended into the support ring (4), and are constrained by the support ring (4). After that, each steel strand is respectively passed through the corresponding first bundle sleeve (10) and the second bundle sleeve (11), so as to realize the function of combing the steel strands constrained by the support ring (4). At the same time, the rotating rod (12) can also be located on the outside of the steel strands, so that the steel strands can be easily passed through the corrugated tube; Step 2: the output end of the electric push rod (14) extends to drive the hinge frame (15) and the hinge block (16) to move, thereby enabling the first cable sleeve (10) to adjust the angle at the bottom end of the lower extension rod (9), and the second cable sleeve (11) to contact the outside of the twisted area of ​​the steel strand; Step 3: The extension frame (5) and the slide plate (17) can be rotated at the same time to twist the steel strands constrained in the middle of the support ring (4) together, and the limit knob (18) is rotated counterclockwise so that the slide plate (17) and the extension frame (5) are free from limit, and the extension frame (5) can be adjusted on the slide plate (17); Step 4: The second bevel gear (24) drives the screw rod (23) to rotate, so that the support blocks (3) can be displaced on the guide rod (25), so that each support block (3) can be close to or away from the axis point of the support frame (2); Step 5: The traction pull piece (28) is extended through the output end of the hydraulic rod (27) to deflect, thereby causing the restraining belt (29) to spread outward, and then allowing the swivel (20) to rotate, thereby achieving the function of adjusting the angle of each support block (3) facing the outside of the support frame (2).

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