A device and method for threading steel strands in a cast-in-place box girder

Abstract

The present invention discloses a device and a threading method for steel strands of a cast-in-place box girder, specifically relating to the technical field of steel strand installation, including a base, on which a support assembly is arranged. The support assembly includes a support frame arranged on the top of the base, and a number of support blocks with adjustable positions are distributed on the support frame. By preventing the steel strands from being intertwined with each other, and at the same time, the rotating rod can also be located outside the steel strands, the present invention realizes the function of supporting the steel strands, reduces the friction between the steel strands and the second wire sleeve and the first wire sleeve during pulling, improves the stability and convenience during the threading of a single steel strand, facilitates the penetration of the steel strand through the corrugated pipe, and enables the force to be evenly distributed when the steel strand is stressed. It has the advantages of improving the tensile control stress of a single steel strand and preventing the steel strand from being broken.

Description

Technical Field

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

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

[0003] Among them, the patent with publication number CN215407487U discloses a steel strand threading device for cast-in-place box girders with simple and convenient construction, including a motor and a speed reducer connected to each other. It also includes a steel strand, a steel strand guiding head, and a clamping head. One end of the steel strand is connected to the output shaft of the speed reducer through the clamping head, and the steel strand guiding head is arranged at the other end of the steel strand;

[0004] When this structure is in use, the cooperation of the motor and the speed reducer drives the steel strand to rotate, enabling the steel strand to pass through bellows with a long distance and a complex spatial curve. Through the rapid rotation of the steel strand, the prestressed threading work can be completed with high quality and quantity in the shortest time, avoiding the situation of twisting and breaking wires during the tensioning process. However, when this structure is in use, it is not easy to comb the steel strands, resulting in easy entanglement during wiring installation. At the same time, it is not easy to individually adjust the tension of each steel strand appropriately, and the effect of the prestressed threading work is not good when in use. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a steel strand threading device and a threading method for cast-in-place box girders, aiming to solve the problems proposed in the above background art.

[0006] The present invention provides the following technical solutions: A steel strand threading device for cast-in-place box girders, including a base, and a support assembly is arranged on the base;

[0007] The support assembly includes a support frame arranged on the top of the base. A number of support blocks with adjustable positions are distributed on the support frame, and a support ring for bundling wires is fixedly arranged on each support block. An extension frame with an adjustable position is arranged on one side of the support ring, and a hinged plate with an adjustable angle is arranged on one side of the extension frame. A number of support rods are fixedly arranged on the hinged plate, and sliding grooves are formed through each support rod;

[0008] A lower extension rod is slidably connected in each of the plurality of sliding grooves, and the bottom end of the lower extension rod is inclined downward. The bottom end of the lower extension rod is hinged with a first wire sleeve. A second wire sleeve is hinged on the first wire sleeve. One end of the second wire sleeve is rotatably connected with two rotating rods. A lower pull box is fixedly arranged at the bottom of the support rod. A plurality of electric push rods are hinged on the lower pull box, and the output ends of the electric push rods are fixedly provided with hinged frames. A hinged block is hinged on each of the plurality of hinged frames, and one end of each hinged block extends to the corresponding first wire sleeve. The hinged block and the first wire sleeve are detachably connected by bolts;

[0009] It can be seen that in the above technical solution, after being constrained by the support ring, each steel strand passes through the corresponding first wire sleeve and second wire sleeve respectively, realizing the function of combing the steel strands after being constrained by the support ring, avoiding the intertwining of each steel strand. At the same time, the rotating rod can also be located outside the steel strand to realize the function of supporting the steel strand, reducing the friction between the steel strand and the second wire sleeve and the first wire sleeve during pulling, improving the stability and convenience of a single steel strand threading, and facilitating the steel strand to penetrate the corrugated pipe. The hinged frame and the hinged block displace, and then the first wire sleeve can adjust the angle at the bottom end of the lower extension rod by the traction force during the displacement of the hinged frame and the hinged block, causing the steel strand to twist. The second wire sleeve can abut against the outside of the twisted area of the steel strand to realize the function of limiting the tightness adjustment of the steel strand;

[0010] Optionally, in a possible implementation manner, two sliding plates are rotatably connected to the outside of the support ring, and each sliding plate extends to the extension frame. The sliding plate is slidably connected with the extension frame. One end of the sliding plate is threadedly connected with a limit knob. The limit knob penetrates 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 covers the hinged plate and is hinged with the hinged plate. A rotating ring is rotatably connected to the top of the base. A first bevel gear is rotatably connected to the rotating ring. A vertical cylinder is rotatably connected to the middle of the first bevel gear. The bottom end of the vertical cylinder penetrates the first bevel gear and is fixed on the rotating ring. A plurality of handles are inserted on the outside of the first bevel gear. A plurality of second bevel gears are distributed on the first bevel gear, and each second bevel gear is located on one side of the corresponding support block. The second bevel gear meshes with the first bevel gear. One end of the second bevel gear is fixedly provided with a lead screw. The lead screw is threadedly connected with the support block. One end of the lead screw is rotatably connected with a guide rod. The guide rod penetrates the support block and is inserted on the vertical cylinder. The support block is slidably connected with the guide rod. A hydraulic rod is hinged on the base. The output end of the hydraulic rod is hinged with a traction pulling member. One end of the traction pulling member is hinged with a restraint belt. The restraint belt is located outside the rotating ring. One end of the restraint belt is installed on the base by bolts, and the traction pulling member is rotatably connected with the base;

[0011] It can be seen that in the above technical solution, each structure on the hinged cover, hinged plate and support rod makes a circular motion along the axis point of the support ring, twisting together the steel strands constrained in the middle of the support ring, facilitating the uniform distribution of force when the steel strands are stressed, increasing the tensile control stress of a single steel strand, avoiding the steel strands from being pulled off. Also, by rotating the limit knob counterclockwise, the skateboard and the extension frame lose their limits, and the extension frame can be adjusted on the skateboard, making it easy to adjust the length of the area where the steel strands can be twisted together. Then, the second bevel gear drives the lead screw to rotate, enabling the support block to displace on the guide rod, allowing each support block to approach or move away from the axis point of the support frame, facilitating the tension adjustment of the steel strands. The restraint belt spreads outwards, causing the rotating ring to lose its limit on the base, and then enabling the rotating ring to rotate, realizing the function of adjusting the angles of each support block facing the outside of the support frame and improving the convenience during the threading of the steel strands.

[0012] A threading method using the above-mentioned in-situ cast box girder steel strand threading device includes the following steps:

[0013] Step 1, the staff installs the device at the designated position. When threading the steel strands, the steel strands are passed through the base, rotating ring, first bevel gear and vertical cylinder from the bottom of the base and extended into the support ring respectively, and are constrained by the support ring. Then, each steel strand is passed through the corresponding first wire sleeve and second wire sleeve respectively, realizing the function of combing the steel strands after being constrained by the support ring, avoiding the intertwining of each steel strand. At the same time, the rotating rod can also be located outside the steel strands, realizing the function of supporting the steel strands, reducing the friction between the steel strands and the second wire sleeve and the first wire sleeve during pulling, improving the stability and convenience during the threading of a single steel strand, and facilitating the penetration of the steel strands through the corrugated pipe.

[0014] Step 2, after the electric push rod is started, the output end of the electric push rod extends to drive the hinged frame and the hinged block to displace. Then, the first wire sleeve can adjust the angle at the bottom end of the downward extension rod under the traction force when the hinged frame and the hinged block displace, causing the steel strands to twist. And the second wire sleeve can abut against the outside of the twisted area of the steel strands, realizing the function of limiting the steel strands during the tightening and loosening adjustment.

[0015] Step 3, at the same time, the extension frame and the skateboard can also be rotated, and then each structure on the hinged cover, hinged plate and support rod makes a circular motion along the axis point of the support ring, twisting together the steel strands constrained in the middle of the support ring, facilitating the uniform distribution of force when the steel strands are stressed, increasing the tensile control stress of a single steel strand, avoiding the steel strands from being pulled off. Also, by rotating the limit knob counterclockwise, the skateboard and the extension frame lose their limits, and the extension frame can be adjusted on the skateboard, making it easy to adjust the length of the area where the steel strands can be twisted together.

[0016] Step 4: The first bevel gear can also be rotated by turning the handle, which in turn causes the second bevel gear to drive the lead screw to rotate, enabling the support block to displace on the guide rod, allowing each support block to approach or move away from the center point of the support frame, facilitating the tension adjustment of the steel strand.

[0017] Step 5: Extend from the output end of the hydraulic rod to deflect the traction pulling member, which in turn causes the restraint belt to spread outwards, causing the swivel ring to lose its limit on the base, and then enabling the swivel ring to rotate, realizing the function of adjusting the angle of each support block facing the outside of the support frame and improving the convenience during the threading of the steel strand.

[0018] Technical effects and advantages of the present invention:

[0019] 1. The steel strand is constrained by the support ring in the present invention, and then each steel strand passes through the corresponding first wire sleeve and second wire sleeve respectively, realizing the function of combing the steel strands after being constrained by the support ring, avoiding the intertwining of each steel strand. At the same time, the rotating rod can also be located outside the steel strand to realize the function of supporting the steel strand, reducing the friction between the steel strand and the second wire sleeve and the first wire sleeve during pulling, improving the stability and convenience during the threading of a single steel strand, and facilitating the penetration of the steel strand through the corrugated pipe.

[0020] 2. In the present invention, the output end of the electric push rod extends to drive the displacement of the hinged frame and the hinge block, which in turn enables the first wire sleeve to adjust the angle at the bottom end of the downward extension rod through the traction force during the displacement of the hinged frame and the hinge block, causing the steel strand to twist, while the second wire sleeve can abut against the outside of the twisted area of the steel strand, realizing the function of limiting the steel strand during the tension adjustment.

[0021] 3. In the present invention, the structures on the hinged cover, the hinged plate and the support rod move in a circular motion along the center point of the support ring to twist the steel strands constrained in the middle of the support ring together, facilitating the uniform distribution of force when the steel strand is stressed, improving the tensile control stress of a single steel strand, avoiding the steel strand from being broken. It is also possible to rotate the limit knob counterclockwise to make the sliding plate and the extension frame lose their limits, and the extension frame can be adjusted on the sliding plate, facilitating the adjustment of the length of the area where the steel strands can be twisted together.

[0022] 4. In the present invention, the second bevel gear drives the lead screw to rotate, enabling the support block to displace on the guide rod, allowing each support block to approach or move away from the center point of the support frame, facilitating the tension adjustment of the steel strand. By deflecting the traction pulling member, the restraint belt spreads outwards, causing the swivel ring to lose its limit on the base, and then enabling the swivel ring to rotate, realizing the function of adjusting the angle of each support block facing the outside of the support frame and improving the convenience during the threading of the steel strand.

[0023] In summary, the overall design is simple and the structure is reasonable. When the respective structures cooperate, each steel strand passes through the corresponding first strand sleeve and second strand sleeve respectively, realizing the function of combing the steel strands after being constrained by the support ring, avoiding the intertwining of each steel strand. At the same time, the rotating rod can also be located outside the steel strands to realize the function of supporting the steel strands, reducing the friction between the steel strands and the second strand sleeve and the first strand sleeve during pulling, improving the stability and convenience of single steel strand threading, making it easy for the steel strands to penetrate the corrugated pipe. The traction force during the displacement of the hinge frame and hinge block is adjusted at the bottom end of the downward extension rod, causing the steel strands to twist. The second strand sleeve can then abut against the outside of the twisted area of the steel strands to realize the function of limiting during the tensioning adjustment of the steel strands. The various structures on the hinge cover, hinge plate, and support rod move in a circular motion along the center point of the support ring, twisting the steel strands constrained in the middle of the support ring together, facilitating the uniform distribution of force when the steel strands are stressed, increasing the tension control stress of a single steel strand, avoiding the steel strands from being broken, and each support block can approach or move away from the center point of the support frame, facilitating the tensioning adjustment of the steel strands. By rotating the rotating ring, the function of adjusting the angle of each support block facing the outside of the support frame is realized, improving the convenience of steel strand threading. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present disclosure, the accompanying drawings required for use in some embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the accompanying drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, other accompanying drawings can also be obtained based on these drawings. In addition, the accompanying drawings in the following description can be regarded as schematic diagrams and do not limit the actual dimensions of the products, the actual processes of the methods, the actual timings of the signals, etc. involved in the embodiments of the present disclosure.

[0025] Figure 1 Top view of the overall structure of the present invention.

[0026] Figure 2 Side view of the support assembly provided by the present invention.

[0027] Figure 3 Three-dimensional view of the support frame, vertical cylinder, support block, first bevel gear, hydraulic rod, and traction pulling member provided by the present invention.

[0028] Figure 4 Three-dimensional view of the support frame, vertical cylinder, support block, lead screw, second bevel gear, and guide rod provided by the present invention.

[0029] Figure 5 Three-dimensional view of the first bevel gear, rotating ring, base, hydraulic rod, traction pulling member, and restraint belt provided by the present invention.

[0030] Figure 6A perspective view of the support ring, extension frame, hinge cover, support rod, downward extension rod, second wire sleeve, and first wire sleeve provided by the present invention.

[0031] Figure 7 A perspective view of the support ring, extension frame, sliding plate, limit knob, and hinge cover provided by the present invention.

[0032] Figure 8 A perspective view of the hinge plate, support rod, downward pull box, electric push rod, and hinge frame provided by the present invention.

[0033] Figure 9 A perspective view of the downward extension rod, first wire sleeve, second wire sleeve, and rotating rod provided by the present invention.

[0034] Reference numerals: 1, base; 2, support frame; 3, support block; 4, support ring; 5, extension frame; 6, hinge plate; 7, support rod; 8, chute; 9, downward extension rod; 10, first wire sleeve; 11, second wire sleeve; 12, rotating rod; 13, downward pull box; 14, electric push rod; 15, hinge frame; 16, hinge block; 17, sliding plate; 18, limit knob; 19, hinge cover; 20, rotating ring; 21, first bevel gear; 22, vertical cylinder; 23, lead screw; 24, second bevel gear; 25, guide rod; 26, handle; 27, hydraulic rod; 28, traction pull piece; 29, restraint strap. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As shown in the attached Figure 1 - Figure 9A cast-in-place box girder steel strand threading device as shown, through the support assembly provided on the base 1, each steel strand is respectively passed through the corresponding first strand sleeve 10 and the second strand sleeve 11, realizing the function of combing the steel strands after being constrained by the support ring 4, avoiding the intertwining of each steel strand. At the same time, the rotating rod 12 can also be located outside the steel strand, realizing the function of supporting the steel strand, reducing the friction between the steel strand and the second strand sleeve 11 and the first strand sleeve 10 during pulling, improving the stability and convenience of single steel strand threading, and facilitating the penetration of the steel strand through the corrugated pipe. The traction force during the displacement of the hinge frame 15 and the hinge block 16 is angle-adjusted at the bottom end of the downward extension rod 9, causing the steel strand to be twisted, while the second strand sleeve 11 can abut against the outside of the twisted area of the steel strand, realizing the function of limiting during the tensioning adjustment of the steel strand. Each structure on the hinge cover 19, the hinge plate 6, and the support rod 7 makes a circular motion along the center point of the support ring 4, twisting the steel strands constrained in the middle of the support ring 4 together, facilitating the uniform distribution of force when the steel strand is stressed, improving the tensile control stress of a single steel strand, avoiding the steel strand from being broken, and each support block 3 can approach or move away from the center point of the support frame 2, facilitating the tensioning adjustment of the steel strand. By rotating the rotating ring 20, the function of adjusting the angle of each support block 3 facing the outside of the support frame 2 is realized, improving the convenience of steel strand threading, and the specific structure of the component is as follows;

[0037] The support assembly includes a support frame 2 provided on the top of the base 1. A number of support blocks 3 with adjustable positions are distributed on the support frame 2, and a support ring 4 for bundling strands is fixedly provided on each support block 3. An extension frame 5 with an adjustable position is provided on one side of the support ring 4, an articulated plate 6 with an adjustable angle is provided on one side of the extension frame 5, a number of support rods 7 are fixedly provided on the articulated plate 6, and a chute 8 is penetrated through each support rod 7.

[0038] A downward extension rod 9 is slidably connected in each of the multiple chutes 8, and the bottom end of the downward extension rod 9 is inclined downward. The bottom end of the downward extension rod 9 is hinged to a first strand sleeve 10. A second strand sleeve 11 is hinged to the first strand sleeve 10. Two rotating rods 12 are rotatably connected to one end of the second strand sleeve 11. A downward pull box 13 is fixedly provided at the bottom of the support rod 7. A number of electric push rods 14 are hinged to the downward pull box 13, and the output end of each electric push rod 14 is fixedly provided with a hinge frame 15. A hinge block 16 is hinged to each of the multiple hinge frames 15, and one end of each hinge block 16 extends to the corresponding first strand sleeve 10. The hinge block 16 and the first strand sleeve 10 are detachably connected by bolts.

[0039] Two sliding plates 17 are rotatably connected to the outer side of the support ring 4, and each sliding plate 17 extends to the extension frame 5. The sliding plate 17 is slidably connected to the extension frame 5. One end of the sliding plate 17 is threadedly connected with a limit knob 18. The limit knob 18 penetrates 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 hinge cover 19. The hinge cover 19 covers the hinge plate 6 and is hinged to the hinge plate 6. A rotating ring 20 is rotatably connected to the top of the base 1. A first bevel gear 21 is rotatably connected to the rotating ring 20. A vertical cylinder 22 is rotatably connected to the middle of the first bevel gear 21. The bottom end of the vertical cylinder 22 penetrates through the first bevel gear 21 and is fixed on the rotating ring 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 distributed on the first bevel gear 21, and each second bevel gear 24 is located on one side of the corresponding support block 3. The second bevel gear 24 meshes with the first bevel gear 21. One end of the second bevel gear 24 is fixedly provided with a lead screw 23. The lead screw 23 is threadedly connected with the support block 3. One end of the lead screw 23 is rotatably connected with a guide rod 25. The guide rod 25 penetrates through the support block 3 and is inserted on the vertical cylinder 22. The support block 3 is slidably connected with the guide rod 25. A hydraulic rod 27 is hinged on the base 1. The output end of the hydraulic rod 27 is hinged with a traction pulling member 28. One end of the traction pulling member 28 is hinged with a restraint belt 29. The restraint belt 29 is located outside the rotating ring 20. One end of the restraint belt 29 is installed on the base 1 through a bolt, and the traction pulling member 28 is rotatably connected with the base 1.

[0040] A wire threading method, using the cast-in-place box girder steel strand wire threading device as described above, includes the following steps:

[0041] Step 1, the staff installs the device at the designated position. When threading the steel strand, the steel strand penetrates 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 extends into the support ring 4 respectively, and is constrained by the support ring 4. Then, each steel strand penetrates through the corresponding first wire sleeve 10 and the second wire sleeve 11 respectively, realizing the function of combing the steel strands after being constrained by the support ring 4, avoiding the intertwining of each steel strand. At the same time, the rotating rod 12 can also be located outside the steel strand, realizing the function of supporting the steel strand, reducing the friction between the steel strand and the second wire sleeve 11 and the first wire sleeve 10 during pulling, improving the stability and convenience of single steel strand threading, and facilitating the penetration of the steel strand through the corrugated pipe.

[0042] Step 2, after the electric push rod 14 is started, the output end of the electric push rod 14 extends to drive the displacement of the hinge frame 15 and the hinge block 16, and then the first wire sleeve 10 can adjust the angle at the bottom end of the downward extension rod 9 by the traction force during the displacement of the hinge frame 15 and the hinge block 16, causing the steel strand to twist, while the second wire sleeve 11 can abut against the outside of the twisted area of the steel strand, realizing the function of limiting when adjusting the tightness of the steel strand.

[0043] Step 3: Meanwhile, the extension frame 5 and the sliding plate 17 can also be rotated, so that each structure on the hinge cover 19, the hinge plate 6 and the support rod 7 makes a circular motion along the central point of the support ring 4, twisting the steel strands constrained in the middle of the support ring 4 together, facilitating the uniform distribution of force when the steel strands are stressed, increasing the tensile control stress of a single steel strand, avoiding the steel strands from being broken. Also, by rotating the limit knob 18 counterclockwise, the sliding plate 17 and the extension frame 5 lose their limits, and the extension frame 5 can be adjusted on the sliding plate 17, making it easy to adjust the length of the area where the steel strands can be twisted together.

[0044] Step 4: It is also possible to drive the first bevel gear 21 to rotate by rotating the handle 26, and then drive the second bevel gear 24 to drive the lead screw 23 to rotate, so that the support block 3 can be displaced on the guide rod 25, enabling each support block 3 to approach or move away from the central point of the support frame 2, facilitating the tension adjustment of the steel strands.

[0045] Step 5: Extend the output end of the hydraulic rod 27, causing the traction pulling member 28 to deflect, and then causing the restraint belt 29 to spread outwards, so that the swivel ring 20 loses its limit on the base 1, and then enabling the swivel ring 20 to rotate, realizing the function of adjusting the angle of each support block 3 facing the outside of the support frame 2, and improving the convenience during the threading of the steel strands.

[0046] When using the above structure, the steel strands are passed through the base 1, the swivel ring 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 are constrained by the support ring 4. Then, each steel strand passes through the corresponding first wire sleeve 10 and the second wire sleeve 11 respectively, realizing the function of combing the steel strands after being constrained by the support ring 4. At the same time, the rotating rod 12 can also be located outside the steel strands, making it easy for the steel strands to pass through the corrugated pipe. The output end of the electric push rod 14 extends to drive the hinge frame 15 and the hinge block 16 to displace, and then the first wire sleeve 10 can adjust the angle at the bottom end of the downward extension rod 9, while the second wire sleeve 11 can abut against the outside of the twisted area of the steel strands.

[0047] Meanwhile, the extension frame 5 and the sliding plate 17 can also be rotated to twist the steel strands constrained in the middle of the support ring 4 together. Rotate the limit knob 18 counterclockwise to make the sliding plate 17 and the extension frame 5 lose their limits, and the extension frame 5 can be adjusted on the sliding plate 17. The second bevel gear 24 drives the lead screw 23 to rotate, so that the support block 3 can be displaced on the guide rod 25, enabling each support block 3 to approach or move away from the central point of the support frame 2. Extend the output end of the hydraulic rod 27 to deflect the traction pulling member 28, and then cause the restraint belt 29 to spread outwards, and then enable the swivel ring 20 to rotate, realizing the function of adjusting the angle of each support block 3 facing the outside of the support frame 2.

[0048] Different from the prior art, the present application discloses a steel strand threading device for cast-in-place box girders. By respectively threading each steel strand through the corresponding first strand sleeve 10 and second strand sleeve 11, the function of combing the steel strands after being constrained by the support ring 4 is realized, avoiding the intertwining of each steel strand. At the same time, the rotating rod 12 can also be located outside the steel strands to realize the function of supporting the steel strands, reducing the friction between the steel strands and the second strand sleeve 11 and the first strand sleeve 10 during pulling, improving the stability and convenience of single steel strand threading, and facilitating the penetration of the steel strands through the corrugated pipe. The traction force during the displacement of the hinge frame 15 and the hinge block 16 is angle-adjusted at the bottom end of the downward extension rod 9, causing the steel strands to be twisted. The second strand sleeve 11 can then abut against the outside of the steel strand twisting area to realize the function of limiting during the tensioning adjustment of the steel strands. Each structure on the hinge cover 19, the hinge plate 6, and the support rod 7 makes a circular motion along the center point of the support ring 4, twisting the steel strands constrained in the middle of the support ring 4 together, facilitating the uniform distribution of force when the steel strands are stressed, improving the tensile control stress of a single steel strand, and avoiding the steel strands from being broken. Moreover, each support block 3 can approach or move away from the center point of the support frame 2, facilitating the tensioning adjustment of the steel strands. By rotating the rotating ring 20, the function of adjusting the angle of each support block 3 facing the outside of the support frame 2 is realized, improving the convenience of steel strand threading.

[0049] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A post-cast box girder steel strand threading device, comprising a base (1), characterized in that: A support component is provided on the base (1). The support component includes a support frame (2) provided on the top of the base (1). A number of support blocks (3) with adjustable positions are distributed on the support frame (2). A support ring (4) is fixedly provided on each of the support blocks (3). An extension frame (5) is provided on one side of the support ring (4). A hinge plate (6) is provided on one side of the extension frame (5). A number of support rods (7) are fixedly provided on the hinge plate (6). A chute (8) is formed through each of the support rods (7). A downward extension rod (9) is slidably connected in each of the plurality of chutes (8). The bottom end of the downward extension rod (9) is hinged to a first wire sleeve (10). A second wire sleeve (11) is hinged to the first wire sleeve (10). Two rotating rods (12) are rotatably connected to one end of the second wire sleeve (11). A downward pull box (13) is fixedly provided at the bottom of the support rod (7). A number of electric push rods (14) are hinged to the downward pull box (13). The output end of each of the electric push rods (14) is fixedly provided with a hinge box (15). A hinge block (16) is hinged to each of the plurality of hinge boxes (15). One end of each of the hinge blocks (16) extends to the corresponding first wire sleeve (10). The hinge block (16) and the first wire sleeve (10) are detachably connected by bolts. Two sliding plates (17) are rotatably connected to the outside of the support ring (4). Each of the sliding plates (17) extends to the extension frame (5). The sliding plate (17) is slidably connected to the extension frame (5). A limit knob (18) is threadedly connected to one end of the sliding plate (17). The limit knob (18) penetrates the extension frame (5) and extends to one side of the extension frame (5).

2. The post-cast box girder steel strand threading device according to claim 1, wherein: One end of the extension frame (5) is fixedly provided with a hinge cover (19). The hinge cover (19) covers the hinge plate (6) and is hinged to the hinge plate (6).

3. The post-cast box girder steel strand threading device according to claim 1, characterized in that: A rotating ring (20) is rotatably connected to the top of the base (1). A first bevel gear (21) is rotatably connected to the rotating ring (20). A vertical cylinder (22) is rotatably connected to the middle of the first bevel gear (21). The bottom end of the vertical cylinder (22) penetrates the first bevel gear (21) and is fixed to the rotating ring (20). A number of handles (26) are inserted on the outside of the first bevel gear (21).

4. The post-cast box girder steel strand threading device according to claim 3, characterized in that: A number of second bevel gears (24) are distributed on the first bevel gear (21). Each of the second bevel gears (24) is located on one side of the corresponding support block (3). The second bevel gear (24) meshes with the first bevel gear (21).

5. The post-cast box girder steel strand threading device according to claim 4, characterized in that: A lead screw (23) is fixedly provided at one end of the second bevel gear (24). The lead screw (23) is threadedly connected to the support block (3). One end of the lead screw (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).

6. The post-cast box girder steel strand threading device according to claim 5, wherein: A hydraulic rod (27) is hinged on the base (1). The output end of the hydraulic rod (27) is hinged with a traction pulling member (28). One end of the traction pulling member (28) is hinged with a restraint belt (29). The restraint belt (29) is located outside the swivel ring (20). One end of the restraint belt (29) is installed on the base (1) by bolts, and the traction pulling member (28) is rotatably connected to the base (1).

7. A method for threading, using the cast-in-place box girder strand threading device described in claim 6, characterized in that: It includes the following steps: Step 1: When threading the steel strand, pass the steel strand through the base (1), the swivel ring (20), the first bevel gear (21) and the vertical cylinder (22) from the bottom of the base (1) and extend them into the support ring (4) respectively. After being constrained by the support ring (4), then pass each steel strand through the corresponding first wire sleeve (10) and the second wire sleeve (11) respectively to realize the function of combing the steel strands after being constrained by the support ring (4). At the same time, the rotating rod (12) can also be located outside the steel strand, which is convenient for the steel strand to penetrate the corrugated pipe; Step 2: The output end of the electric push rod (14) extends to drive the articulated frame (15) and the articulated block (16) to displace, so that the first wire sleeve (10) can adjust the angle at the bottom end of the downward extension rod (9), while the second wire sleeve (11) can abut against the outside of the steel strand twisting area; Step 3: At the same time, the extension frame (5) and the sliding plate (17) can also be rotated to twist the steel strands constrained in the middle of the support ring (4) together. Rotate the limit knob (18) counterclockwise so that the sliding plate (17) and the extension frame (5) lose their limits, and the extension frame (5) can be adjusted on the sliding plate (17); Step 4: The second bevel gear (24) drives the lead screw (23) to rotate, so that the support block (3) can displace on the guide rod (25), so that each support block (3) can approach or move away from the center point of the support frame (2); Step 5: The output end of the hydraulic rod (27) extends to deflect the traction pulling member (28), so that the restraint belt (29) diffuses outwards, so that the swivel ring (20) can rotate, realizing the function of adjusting the angles of the support blocks (3) facing the outside of the support frame (2).

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