A novel prestressed tendon threading device for segmental girder bridges and its construction technology

Abstract

The present invention relates to a novel prestressed tendon threading device applied to segmental girder bridges, comprising: a power propulsion assembly, a through-hole pretreatment assembly, a protective cap, and a sphere assembly. The power propulsion assembly is used to provide power for the through-hole pretreatment assembly and the sphere assembly while threading prestressed steel tendons. The through-hole pretreatment assembly is connected to the power propulsion assembly and is used for linearly checking the bellows and cleaning the inner wall. By using the power propulsion assembly to replace the traditional power propulsion device and using the through-hole pretreatment assembly to solve the problems of small threading space for steel strands, unclear arc line shape of the duct, and the existence of edges, the protective cap is used to prevent the steel strands from being scratched, and the sphere assembly can prevent the steel strands from being positioned and wound. It can significantly improve the construction speed, prevent the prestressed steel strands from being scratched and wound, greatly improve the construction accuracy and efficiency, and ensure the construction quality of segmental girders.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and more particularly, to a novel prestressed cable threading device for segmental girder bridges and its construction technology. Background Art

[0002] Currently, most of the prestressed steel strands of segmental girder bridges are threaded manually. During the threading process, the manual measurement accuracy of the length of the steel strands is poor and the speed is slow. Moreover, during the threading process of the prestressed steel strands of segmental girder bridges, due to factors such as the small space of the prestressed ducts, the existence of linear errors in the duct curvature, and the presence of edges at the shear key joints, the prestressed bundles that have been threaded will be scratched, and the steel strands will be wound during the threading process of the prestressed steel bundles, resulting in early prestress loss, accelerating the corrosion of the prestressed steel strands, causing poor linearity (deflection) in the overall span of the segmental girder, and being prone to accelerating the damage of the steel bundles under the action of vehicle loads and the like in the later stage. To solve the above problems, the threading equipment and construction methods of the prestressed steel strands of segmental girder bridges are the key to construction.

[0003] In the existing related technical research and scientific research achievements in this field, the old method of threading the prestressed steel strands of segmental girder bridges is still adopted: manual threading combined with a power propulsion device. This old method has problems such as a small threading space for the steel strands, an unclear linearity of the duct curvature, the existence of edges, and the steel strands are easily scratched, the positioning of the steel strands is difficult and they are easily wound, affecting the construction accuracy and efficiency, and it is difficult to ensure the construction quality of the segmental girder. Summary of the Invention

[0004] The purpose of the present invention is to provide a novel prestressed cable threading device for segmental girder bridges and its construction technology.

[0005] To solve the above technical problems, the present invention provides a novel prestressed cable threading device for segmental girder bridges, including: a power propulsion assembly, a through-hole pretreatment assembly, a protective cap, and a sphere assembly. The power propulsion assembly is used to provide power for the through-hole pretreatment assembly and the sphere assembly while threading the prestressed steel bundle; the through-hole pretreatment assembly is connected to the power propulsion assembly and is used for linearly checking and inner wall cleaning of the corrugated pipe. The sphere assembly is installed at the end of the power propulsion assembly and is used for perforating and positioning and linear combing of single or multiple prestressed steel strands; the protective cap is installed at the end of the sphere assembly and is used to prevent scratches on the surface of the prestressed steel strands.

[0006] Further, the power propulsion assembly includes a device body, a chip, a travel distance measurer, a winch, and an air compressor. A power supply is installed inside the device body. A chip is installed on one side of the power supply. A pusher is installed at the bottom of the power supply. An air compressor is installed at the bottom of the pusher. An air pressure transmission pipe is installed on the top of the air compressor. An interface is provided at the end of the air pressure transmission pipe. A travel distance measurer is installed on one side of the pusher. A slot is installed on one side of the pusher. Two winches are installed inside the device body. A rope connector is installed at the traction end of the winch; the chip (single-chip microcomputer) is respectively connected to the power propulsion assembly, the air compressor, and the winch, and is used to control the operation of the power propulsion assembly, the through-hole pretreatment assembly, and the sphere assembly.

[0007] Further, the travel distance measurer is installed at the propulsion end of the power propulsion assembly and is connected to the chip.

[0008] Further, the through-hole pretreatment assembly includes a power propulsion rod, an air pressure transmission pipe, a through-hole end head, a debris removal end head, and a linear inspection end head installed on the slot. The power propulsion rod is a hollow telescopic structure with a certain elasticity. The air pressure transmission pipe is a high-pressure hose and is installed inside the power propulsion rod. The air pressure transmission pipe is connected to the air compressor. The power propulsion rod is connected to the transmission end of the power propulsion assembly. The through-hole end head, the debris removal end head, and the linear inspection end head are fixedly connected to the end of the power propulsion rod during use.

[0009] Further, the through-hole end head includes a through-hole fixed end and a through-hole pneumatic rotary head. The outer side of the pneumatic rotary head is an annular concrete grinding disc. The through-hole fixed end is connected to the power propulsion rod. The through-hole pneumatic rotary head is connected to the air pressure transmission pipe. The diameter of the through-hole end head is smaller than the inner diameter of the prestressed steel strand threading bellows of the segmental girder.

[0010] Further, the debris removal end head includes a debris removal fixed end and a debris removal pneumatic rotary head. The outer side of the pneumatic rotary head is a flexible brush. The through-hole fixed end is connected to the power propulsion rod. The through-hole pneumatic rotary head is connected to the air pressure transmission pipe. The diameter of the debris removal end head is smaller than the inner diameter of the prestressed steel strand bellows of the segmental girder.

[0011] Further, the sphere assembly includes a traction rope and an anti-tangling ball. The traction rope is connected to the winch of the power propulsion assembly. The anti-tangling ball is fixed to the end of the prestressed steel strand threading.

[0012] Further, the anti-tangling ball is a spherical structure. A perforation runs through the anti-tangling ball. Ball bearings are fixedly installed on the inner wall of the perforation. The diameter of the perforation inside the anti-tangling ball is larger than the diameter of the steel strand.

[0013] Furthermore, the protective cap is fixedly installed at the end of the prestressed steel strand passing through the bundle, preventing the cut end of the prestressed steel strand from scratching the surface of other prestressed steel strands, and can be used for temporarily fixing and connecting the anti-tangling ball. The protective cap is of a cylindrical structure. There is a fixed jack on the outer top of the protective cap, and several card slots are arranged inside. Corresponding bayonets are provided on the card slots. Spring balls are installed on the inner and outer sides of the protective cap. The diameter of the protective cap is smaller than the diameter of the prestressed steel strand passing through the corrugated pipe.

[0014] The present invention also provides a construction process for a new type of prestressed strand passing device applied to segmental girder bridges, and the specific steps are as follows:

[0015] S1: First, connect the power propulsion component and the through-hole end to the power propulsion rod and the pneumatic transmission pipe respectively, start the power propulsion component, and perform a through-hole operation on the corrugated pipe.

[0016] S2: By connecting the power propulsion component and the impurity removal end to the power propulsion rod and the pneumatic transmission pipe respectively, start the power propulsion component, and perform an impurity removal operation on the corrugated pipe after the through-hole; and connect the power propulsion component and the linear inspection end to the power propulsion rod, start the power propulsion component, perform a linear inspection operation on the corrugated pipe after the impurity removal, and measure the distance of the central axis of the corrugated pipe at the same time.

[0017] S3: Then install the sphere assembly on one or more steel strands to be strand-passed, connect the towing rope to the winch in the power propulsion component, install the sphere assembly, and fixedly connect one or more steel strands to the fixed jack in the protective cap, and install the protective cap.

[0018] S4: Since the sphere assembly and the protective cap have been assembled with one or more steel strands, use the power propulsion component to perform strand passing on the assembled one or more steel strands. After the power propulsion component automatically strand-passes one or more steel strands to the other end of the corrugated pipe, fix the protective cap at the end of the steel strand at the tail end of the corrugated pipe. The power propulsion component drives one or more steel strands to pull back, and positions one or more steel strands according to the position of the fixed jack of the protective cap at the end of the steel strand.

[0019] S5: Finally, start the power propulsion component, use the winch to pull the anti-tangling balls on one or more steel strands back to the strand-passing end of the corrugated pipe through the towing rope. After all the anti-tangling balls are pulled back to the inlet end of the corrugated pipe, remove the protective cap at the end of the steel strand at the other end of the corrugated pipe, and then the strand passing work for the next batch of steel strands can be started.

[0020] The beneficial effects of the present invention are as follows. A novel prestressed cable threading device and its construction process for segmental girder bridges of the present invention use a power propulsion component to replace the traditional power propulsion device, and use a through-hole pretreatment component to solve the problems of small cable threading space for steel strands, unclear arc line shape of the duct, and the existence of edges. The cable is protected from scratches by a protective cap, and the spherical component can prevent the positioning and winding of the steel strands. It can significantly improve the construction speed, prevent the scratching and winding of prestressed steel strands, greatly improve the construction accuracy and efficiency, and ensure the construction quality of segmental girders. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings and embodiments.

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the power propulsion component of the present invention;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of the power propulsion rod of the present invention;

[0024] Figure 3 It is a schematic cross-sectional structure diagram of the spherical component of the present invention;

[0025] Figure 4 It is a partial schematic diagram of the protective cap of the present invention;

[0026] Figure 5 It is a schematic cross-sectional structure diagram of the protective cap of the present invention;

[0027] Figure 6 It is a schematic structure diagram of the through-hole end of the present invention;

[0028] Figure 7 It is a schematic structure diagram of the impurity removal end of the present invention;

[0029] Figure 8 It is a schematic structure diagram of the linear inspection end of the present invention.

[0030] In the figure:

[0031] 1. Power propulsion component; 2. Power propulsion rod; 3. Pneumatic transmission pipe; 4. Through-hole end; 5. Impurity removal end; 6. Linear inspection end; 7. Spherical component; 8. Protective cap; 9. Prestressed steel strand;

[0032] 10. Power supply; 11. Chip; 12. Propulsion machine; 13. Slot; 14. Air compressor; 15. Interface; 16. Winch; 17. Rope body joint; 18. Travel distance measuring instrument;

[0033] 19. Through-hole pretreatment component; 191. Through-hole fixed end; 20. Pneumatic rotary head for through-hole; 21. Concrete grinding disc; 22. Impurity removal fixed end; 23. Pneumatic rotary head for impurity removal; 24. Flexible brush; 25. Conducting wire; 26. Fixed end of detection head; 27. Laser inclinometer;

[0034] 28. Card slot; 29. Bayonet; 30. Fixed jack;

[0035] 31. Anti-tangling ball; 32. Perforation; 33. Semi-embedded ball; 34. Traction rope; 35. Rope body buckle; 36. Embedded buckle. Detailed implementation mode

[0036] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0037] Embodiment 1:

[0038] As Figure 1-8 shown, a new type of prestressed tendon threading device applied to segmental girder bridges of the present invention includes: a power propulsion component, a through-hole pretreatment component, a protective cap, and a sphere component. The power propulsion component provides power for the through-hole pretreatment component and the sphere component while threading the prestressed steel strand. The power propulsion component includes a device body, a chip, a travel distance measuring instrument, a winch, and an air compressor. A power supply is installed inside the device body. A chip is installed on one side of the power supply. A propulsion machine is installed at the bottom of the power supply. An air compressor is installed at the bottom of the propulsion machine. An air pressure transmission pipe is installed on the top of the air compressor. An interface is provided at the end of the air pressure transmission pipe. A travel distance measuring instrument is installed on one side of the propulsion machine. A slot is installed on one side of the propulsion machine. Two groups of winches are installed inside the device body. A rope body joint is installed at the traction end of the winch. The chip (single-chip microcomputer) is respectively connected to the power propulsion component, the air compressor, and the winch, and is used to control the operation of the power propulsion component, the through-hole pretreatment component, and the sphere component. The travel distance measuring instrument is installed at the propulsion end of the power propulsion component and is connected to the chip.

[0039] Power propulsion component

[0040] It is improved based on the existing prestressed steel strand threading power propulsion device. On the basis of the original function of threading the steel strand, a chip (single-chip microcomputer), a travel distance measuring instrument, a winch and an air compressor are installed. The travel distance measuring instrument, the winch and the air compressor are all connected to the chip (single-chip microcomputer). The power propulsion component is used to provide propulsion power and travel control for the through-hole pretreatment component, the sphere component and the prestressed steel strand threading; when threading the prestressed steel strand, it provides power for the through-hole pretreatment component and the sphere component. The travel distance measuring instrument is installed at the power propulsion end of the prestressed steel strand of the power propulsion component. During the process of passing through the corrugated pipe, it monitors the travel of the power propulsion rod, determines the length of the central axis of the corrugated pipe, and determines the length of the corrugated pipe; the winch is installed inside the power propulsion component. Before threading the prestressed steel strand, the winch is connected to the traction rope in the sphere component, and is used to drive the anti-twist ball to work through the traction rope, providing anti-twist power for the sphere component; the air compressor is installed inside the power propulsion component. When passing through the corrugated pipe and removing impurities, the air compressor is respectively connected to the pneumatic transmission pipe in the through-hole pretreatment component, providing rotational power for the through-hole end and the impurity removal end respectively; the chip (single-chip microcomputer) is installed inside the power propulsion component, and the chip (single-chip microcomputer) is respectively connected to the power propulsion component, the air compressor and the winch, and is used to control the operation of the power propulsion component, the through-hole pretreatment component and the sphere component.

[0041] Using the travel distance measuring instrument, during the work of passing through the corrugated pipe before the prestressed steel strand threading work, it monitors the travel of the power propulsion rod, and then determines the length of the axis line of the corrugated pipe. After determining the length, the chip (single-chip microcomputer) controls the operation of the power propulsion component, controls the start and stop times of the power propulsion device and the air compressor during the corrugated pipe impurity removal and linear inspection work; controls the travel of the power propulsion rod, the through-hole end, the impurity removal end and the linear inspection end; controls the travel of the steel strand during the prestressed steel strand threading process.

[0042] When carrying out the work of passing through the corrugated pipe, the travel distance measuring instrument monitors the travel of the power propulsion rod and transmits this data to the chip (single-chip microcomputer).

[0043] When the work of passing through the corrugated pipe is completed and the corrugated pipe impurity removal equipment is assembled, the chip (single-chip microcomputer) controls the operation of the power propulsion device and the air compressor. According to the length of the axis line of the corrugated pipe monitored by the travel distance measuring instrument, after pushing the corrugated pipe impurity removal device to the outlet end of the corrugated pipe through the power propulsion rod, the chip (single-chip microcomputer) controls the air compressor, so that the impurity removal end in the corrugated pipe impurity removal device rotates in reverse, and at the same time controls the power propulsion device to rotate in reverse, and the power propulsion rod contracts, driving the corrugated pipe impurity removal device to move to the inlet end of the corrugated pipe. According to the corrugated pipe impurity removal situation, this process can be repeated multiple times until the impurity removal in the corrugated pipe is completed.

[0044] After the bellows cleaning work is completed, the chip (single-chip microcomputer) controls the power propulsion device to work. According to the length of the bellows axis line monitored by the travel rangefinder, the linear inspection head is pushed to the outlet end of the bellows through the power propulsion rod to inspect the linearity of the bellows. After the linear inspection is completed, the chip (single-chip microcomputer) controls the power propulsion device to reverse, the power propulsion rod contracts, driving the linear inspection head to move to the inlet end of the bellows, and reasonably controls the subsequent prestressed steel strand threading sequence and traveling speed according to the linear inspection results.

[0045] After the linear inspection work is completed and the sphere assembly and the protective cap are installed, the chip (single-chip microcomputer) controls the power propulsion device to work. According to the length of the bellows axis line monitored by the travel rangefinder, the sphere assembly, the protective cap and one or more prestressed steel strands are pushed to the outlet end of the bellows through the power propulsion rod. After the protective cap is fixed, the chip (single-chip microcomputer) controls the power propulsion device to reverse, driving the one or more steel strands to pull back, and perforating and positioning the one or more steel strands according to the fixed jack positions of the steel strand end protective caps.

[0046] After the prestressed steel strand threading and perforating and positioning work are completed, the chip (single-chip microcomputer) controls the winch to work. According to the length of the bellows axis line monitored by the travel rangefinder, the anti-tangling ball is driven to move to the inlet end of the bellows through the traction rope to complete the linear combing and anti-tangling work of the prestressed steel strands.

[0047] After the above work is completed, the connection between the power propulsion device and the prestressed steel strand is cut off. The chip (single-chip microcomputer) controls the power propulsion device to work. According to the length of the bellows axis line monitored by the travel rangefinder, the power propulsion rod is retracted, thus realizing the automatic control of the power propulsion component for the prestressed steel strand threading process.

[0048] The through-hole pretreatment component is connected to the power propulsion component and is used for linear inspection of the bellows and inner wall cleaning.

[0049] The through-hole pretreatment assembly includes a power propulsion rod, a pneumatic transmission pipe, a through-hole end head, a debris removal end head, and a linear inspection end head installed on the slot. The power propulsion rod is a hollow telescopic structure with a certain elasticity. The pneumatic transmission pipe is a high-pressure hose installed inside the power propulsion rod and connected to an air compressor. The power propulsion rod is connected to the transmission end of the power propulsion assembly. The through-hole end head, the debris removal end head, and the linear inspection end head are fixedly connected to the end of the power propulsion rod during use. The through-hole end head includes a through-hole fixed end and a pneumatic rotary head for the through-hole. The outer side of the pneumatic rotary head is an annular concrete grinding disc. The through-hole fixed end is connected to the power propulsion rod, and the pneumatic rotary head for the through-hole is connected to the pneumatic transmission pipe. The diameter of the through-hole end head is smaller than the inner diameter of the prestressed steel strand threading bellows of the segmental girder. The debris removal end head includes a debris removal fixed end and a pneumatic rotary head for debris removal. The outer side of the pneumatic rotary head is a flexible brush. The debris removal fixed end is connected to the power propulsion rod, and the pneumatic rotary head for debris removal is connected to the pneumatic transmission pipe. The diameter of the debris removal end head is smaller than the inner diameter of the prestressed steel strand bellows of the segmental girder.

[0050] Through-hole pretreatment assembly

[0051] Automated control of the prestressed steel strand threading process by the power propulsion assembly. The through-hole pretreatment assembly is used in the preparatory stage before the prestressed steel strand threading construction of the segmental girder bridge to perform through-hole, debris removal, and linear inspection on the prestressed steel strand threading bellows. The through-hole pretreatment assembly consists of a power propulsion rod, a pneumatic transmission pipe, a through-hole end head, a debris removal end head, and a linear inspection end head. The through-hole end head and the debris removal end head need to be connected to the power propulsion rod and the pneumatic transmission pipe respectively, and the linear inspection end head only needs to be connected to the power propulsion rod.

[0052] The power propulsion rod, the pneumatic transmission pipe, and the through-hole end head form a bellows through-hole device. Among them, the power propulsion rod is a hollow telescopic structure with a certain elasticity, preferably made of carbon fiber material. One end of the power propulsion rod is connected to the transmission end of the power propulsion assembly, and the other end can be respectively connected to the through-hole fixed end, the debris removal fixed end, the linear inspection end head, and the protective cap fixed end to provide driving force for related devices.

[0053] Among them, the pneumatic transmission pipe is a high-pressure hose, preferably made of steel wire-reinforced nylon hose material. The pneumatic transmission pipe is placed inside the power propulsion rod. One end of the pneumatic transmission pipe is connected to an air compressor, and the other end can be respectively fixedly connected to the pneumatic rotary head for the through-hole and the pneumatic rotary head for debris removal to provide rotational power for related devices.

[0054] Among them, the through-hole end head is a columnar structure. The through-hole end head consists of a fixed end and a pneumatic rotary head. The outer side of the pneumatic rotary head is an annular concrete grinding disc. The through-hole fixed end is connected to the power propulsion rod, and the pneumatic rotary head for the through-hole is connected to the pneumatic transmission pipe. The diameter of the through-hole end head is smaller than the inner diameter of the bellows.

[0055] The power propulsion rod, the pneumatic transmission pipe, and the impurity removal head form a corrugated pipe impurity removal device. Among them, the impurity removal head is a columnar structure, which consists of a fixed end and a pneumatic rotating head. The outer side of the pneumatic rotating head is a flexible brush. The impurity removal fixed end is connected to the power propulsion rod, and the impurity removal pneumatic rotating head is connected to the pneumatic transmission pipe. The diameter of the impurity removal head is larger than the inner diameter of the corrugated pipe for prestressed steel strands of the segment beam. The power propulsion rod and the linear inspection head form a corrugated pipe linear inspection device; among them, the linear inspection head consists of a fixed end and a laser inclinometer. The laser inclinometer is a prior art, and the fixed end of the inspection head is connected to the power propulsion rod.

[0056] Principle of through-hole impurity removal and linear inspection: Use the power propulsion rod to realize the forward and backward movement of the through-hole head, the impurity removal head, and the linear inspection head inside the corrugated pipe; use the pneumatic transmission pipe and the pneumatic rotating head to realize the rotation of the through-hole head and the impurity removal head inside the corrugated pipe; use the annular concrete grinding disc outside the through-hole pneumatic rotating head and the forward movement force of the through-hole head itself to realize the through-hole inside the corrugated pipe; use the flexible brush outside the impurity removal head and the forward and backward movement force of the impurity removal head to realize the removal of impurities inside the corrugated pipe; use the power propulsion rod and the linear inspection head to realize the linear inspection of the corrugated pipe.

[0057] When carrying out the through-hole work of the corrugated pipe, the power propulsion rod drives the through-hole head to move from the inlet end to the outlet end of the corrugated pipe. At the same time, the pneumatic transmission pipe introduces the compressed air of the air compressor into the through-hole pneumatic rotating head, and the through-hole pneumatic rotating head drives the outer annular concrete grinding disc to rotate, grinding the obstacles such as the residual cement mortar and concrete burrs inside the corrugated pipe to ensure the inner wall of the corrugated pipe is unobstructed.

[0058] When carrying out the impurity removal work of the corrugated pipe, the power propulsion rod drives the impurity removal head to move from the inlet end to the outlet end of the corrugated pipe. At the same time, the pneumatic transmission pipe introduces the compressed air of the air compressor into the impurity removal pneumatic rotating head, and the through-hole pneumatic rotating head drives the outer flexible brush to rotate, removing the impurities such as the residual cement mortar, concrete burrs, and dust inside the corrugated pipe to ensure the inner wall of the corrugated pipe is smooth.

[0059] When carrying out the linear inspection work of the corrugated pipe, the power propulsion rod drives the linear inspection head to move from the inlet end to the outlet end of the corrugated pipe. At the same time, the laser inclinometer in the linear inspection head starts to work, and then the linear distribution of the corrugated pipe is obtained.

[0060] After the above work is completed, according to the linear inspection situation of the corrugated pipe, adjust the appropriate position and traveling speed of the prestressed steel strand bundle, and then the steel strand threading work can be started.

[0061] The sphere assembly is installed at the end of the power propulsion assembly and is used for perforating and linearly combing single or multiple prestressed steel strands; the sphere assembly consists of a traction rope and an anti-twist ball. The traction rope is connected to the winch of the power propulsion assembly, and the anti-twist ball is fixed to the end of the prestressed steel strand passing through the bundle. The anti-twist ball is spherical in structure, and there is a perforation running through it. Ball bearings are fixedly installed on the inner wall of the perforation, and the diameter of the perforation in the anti-twist ball is larger than the diameter of the steel strand.

[0062] Sphere assembly

[0063] The sphere assembly is applied in the stage of prestressed steel strand passing through the bundle. It performs perforation positioning and linear combing for single or multiple prestressed steel strands that have completed passing through the bundle, preventing them from being misaligned and entangled. The sphere assembly consists of a traction rope and an anti-twist ball. Before the prestressed steel strand passes through the bundle, the sphere assembly is fixedly connected to the power propulsion assembly and the prestressed steel strand respectively; one end of the traction rope is connected to the winch, and the other end is connected to the anti-twist ball. The traction rope is preferably made of nylon and is used to pull the anti-twist ball to move from the outlet end of the corrugated pipe to the inlet end of the corrugated pipe; the anti-twist ball is spherical in structure, preferably made of MC nylon. There is a perforation running through the anti-twist ball, and rope body buckles are installed on both sides of the perforation. Ball bearings are fixedly installed on the inner wall of the perforation. The diameter of the perforation in the anti-twist ball is larger than the diameter of the steel strand. The anti-twist ball is used to comb the linearity of the prestressed steel strands and prevent entanglement between the steel strands.

[0064] Among them, the ball bearings on the inner wall of the perforation are semi-embedded. The ball bearings can roll fixedly under a certain friction force. The ball bearings are preferably made of stainless steel and are used to reduce the friction force between the anti-twist ball and the steel strand and prevent the steel strand from being scratched.

[0065] Principle of the sphere assembly: The perforation positioning and anti-entanglement functions after the prestressed steel strand passes through the bundle are realized by using the traction rope and the anti-twist ball. The anti-twist ball is pre-installed on the prestressed steel strand. When the prestressed steel strand passes through the bundle in place, the traction rope drives the anti-twist ball to move towards the inlet end of the corrugated pipe under the drive of the winch. By utilizing the characteristics of the spherical structure of the anti-twist ball with relatively low friction force and strong passing-through ability for multiple steel strands, combined with the protective cap, the perforation positioning and anti-entanglement of the steel strands are realized; the ball bearings on the inner wall of the steel strand perforation in the anti-twist ball are used to reduce the moving resistance of the anti-twist ball and protect the structure of the steel strand wire body.

[0066] Before starting the work of passing the prestressed steel strand through the bundle, the ends of the single or multiple steel strands to be passed through are inserted into the perforation of the anti-twist ball. One end of the traction rope is connected to the winch, and the other end is respectively connected to the rope body buckles on both sides of the perforation of the anti-twist ball. After the steel strand is fixedly connected to the protective cap, and the embedded buckle is embedded into the protective cap at the end of the steel strand, the work of passing the prestressed steel strand through the bundle can be started.

[0067] When the prestressed steel strand passes through the bundle, the speed at which the winch releases the traction wire is slightly faster than the advancing speed of the steel strand until the steel strand reaches the outlet end of the corrugated pipe.

[0068] When the prestressed steel strand is threaded in place, the protective cap is installed and fixed, and the prestressed steel strand is positioned at the rear pull, the winch starts, drives the recovery of the traction rope. After the embedded buckle is disengaged from the end protection cap of the steel strand, the traction rope drives the anti-twist ball to start the linear combing and anti-twist work of the steel strand until the anti-twist ball reaches the inlet end of the corrugated pipe.

[0069] The protective cap is installed at the end of the sphere assembly, used to prevent scratches on the surface of the prestressed steel strand, installed and fixed at the end of the prestressed steel strand threading, preventing the cut end of the prestressed steel strand from scratching the surface of other prestressed steel strands, and can be used to temporarily fix and connect the anti-twist ball. The protective cap is of a cylindrical structure, with a fixed jack on the outer top of the protective cap, several card slots inside, corresponding bayonets on the card slots, spring balls installed on the inner and outer sides of the protective cap, and the diameter of the protective cap is smaller than the diameter of the prestressed steel strand threading corrugated pipe.

[0070] Before the prestressed steel strand threading work is carried out, after the end of a single or multiple steel strands to be threaded is inserted into the perforation of the anti-twist ball, the end of the single or multiple steel strands is inserted into the protective cap for fixation according to the threading position, and then the embedded buckle is embedded into the bayonet in the end protection cap of the steel strand.

[0071] After the prestressed steel strand is threaded in place, the protective cap is fixedly installed on the outside of the outlet end of the corrugated pipe of the segmental girder bridge through the fixed jack on the outer top of the protective cap.

[0072] After the sphere assembly has completed its work, the protective cap can be removed.

[0073] The present invention also provides a construction process for a new type of prestressed steel strand threading device applied to segmental girder bridges, and the specific steps are as follows:

[0074] S1: First, connect the power propulsion component and the through-hole end to the power propulsion rod and the pneumatic transmission pipe respectively, start the power propulsion component, and perform through-hole operation on the corrugated pipe;

[0075] S2: By connecting the power propulsion component and the impurity removal end to the power propulsion rod and the pneumatic transmission pipe respectively, start the power propulsion component, and perform impurity removal operation on the corrugated pipe after through-hole; and connect the power propulsion component and the linear inspection end to the power propulsion rod, start the power propulsion component, perform linear inspection operation on the corrugated pipe after impurity removal, and measure the distance of the central axis of the corrugated pipe at the same time;

[0076] S3: Then install the sphere assembly on a single or multiple steel strands to be threaded, connect the traction rope to the winch in the power propulsion component, install the sphere assembly, and fixedly connect the single or multiple steel strands to the fixed jack in the protective cap, and install the protective cap;

[0077] S4: After the sphere component and the protective cap have been assembled with one or more steel strands, use the power propulsion component to thread the assembled one or more steel strands. After the power propulsion component automatically threads the one or more steel strands to the other end of the corrugated pipe, fix the end protection cap of the steel strand at the tail end of the corrugated pipe. The power propulsion component drives the one or more steel strands to pull backward, and positions the one or more steel strands according to the fixed jack position of the end protection cap of the steel strand;

[0078] S5: Finally, start the power propulsion component, and use a winch to pull back the anti-twist balls on the one or more steel strands through the towing rope. After all the anti-twist balls are pulled back to the inlet end of the corrugated pipe, remove the end protection cap of the steel strand at the other end of the corrugated pipe, and then the threading work of the next batch of steel strands can be started.

[0079] Through-hole of the corrugated pipe: Connect the power propulsion rod to the slot of the power propulsion component, connect the pneumatic transmission pipe joint to the pneumatic rotary head of the through-hole, connect the fixed end of the through-hole to the power propulsion rod, and start the power propulsion component. The power propulsion component pushes the power propulsion rod and the end of the through-hole to move. The air compressor drives the pneumatic rotary head of the through-hole to rotate through the pneumatic transmission pipe. The travel distance measuring instrument monitors the travel of the power propulsion rod until the power propulsion rod pushes the end of the through-hole to the outlet end of the corrugated pipe. The travel distance measuring instrument transmits the monitored travel to the chip (single-chip microcomputer), and the chip (single-chip microcomputer) controls the power propulsion component to rotate in the reverse direction and retract the power propulsion rod. At the same time, the chip (single-chip microcomputer) controls the air compressor to drive the pneumatic rotary head of the through-hole to rotate in the reverse direction through the pneumatic transmission pipe until the power propulsion rod retracts the end of the through-hole to the outlet end of the corrugated pipe according to the travel monitored by the travel distance measuring instrument. According to the situation of the through-hole, this process can be repeated multiple times until the obstacles such as residual cement mortar and concrete burrs in the corrugated pipe are polished, ensuring the smoothness of the inner wall of the corrugated pipe;

[0080] Debris removal from the corrugated pipe: The chip (single-chip microcomputer) controls the power propulsion component to turn off. After removing the relevant through-hole equipment, connect the pneumatic transmission pipe joint to the pneumatic rotary head for debris removal, connect the fixed end for debris removal to the power propulsion rod, and start the power propulsion component. The power propulsion component pushes the power propulsion rod and the end for debris removal to move. The air compressor drives the pneumatic rotary head for debris removal to rotate through the pneumatic transmission pipe. After the chip (single-chip microcomputer) controls the power propulsion component to push the end for debris removal to the designated position according to the travel monitored by the travel distance measuring instrument during the through-hole operation, the chip (single-chip microcomputer) controls the power propulsion component to rotate in the reverse direction and retract the power propulsion rod. At the same time, the chip (single-chip microcomputer) controls the air compressor to drive the pneumatic rotary head for debris removal to rotate in the reverse direction through the pneumatic transmission pipe until the power propulsion rod retracts the end for debris removal to the outlet end of the corrugated pipe according to the travel monitored by the travel distance measuring instrument. According to the debris removal situation, this process can be repeated multiple times until the impurities such as residual cement mortar, concrete burrs, and dust in the corrugated pipe are removed, ensuring the smoothness of the inner wall of the corrugated pipe;

[0081] Linear inspection of the bellows: Then the chip (single-chip microcomputer) controls the power propulsion component to be closed. After the relevant impurity removal equipment is removed, the wire in the linear inspection terminal is connected to the chip (single-chip microcomputer), and the fixed end of the inspection terminal is connected to the power propulsion rod. The power propulsion component is started, and the power propulsion component propels the power propulsion rod and the linear inspection terminal to move. The chip (single-chip microcomputer) controls the power propulsion component to propel the linear inspection terminal to the specified position according to the travel distance meter monitoring stroke during the through-hole operation. The chip (single-chip microcomputer) controls the power propulsion component to rotate in the opposite direction and retract the power propulsion rod until the power propulsion rod retracts the linear inspection terminal to the outlet end of the bellows according to the travel distance meter monitoring stroke. According to the linear inspection situation, the chip (single-chip microcomputer) analyzes and calculates the position and speed of the prestressed steel strand threading. At this point, the bellows through-hole, impurity removal and linear inspection work are completed, and the steel strand threading work can begin;

[0082] Installation of the ball assembly: The chip (single-chip microcomputer) controls the power propulsion assembly to be turned off. After removing the relevant linear inspection equipment, the end of the single steel strand to be bundled is inserted into the anti-winding ball hole, one end of the traction rope is connected to the rope body joint, and the other end is connected to the rope body buckle on both sides of the anti-winding ball hole. After the steel strand is fixedly connected to the protective cap, the embedded buckle is embedded in the buckle of the steel strand end protective cap, and the installation of the ball assembly is completed;

[0083] Installation of protective cap: before starting the work of threading the prestressed steel strands, after the end of the single steel strand to be threaded is inserted into the hole of the anti-winding ball, the single or multiple steel strand ends are inserted into the card slot inside the protective cap according to the threading position and fixed, and then the embedded buckle is embedded into the card slot inside the protective cap of the steel strand end, and the installation of the protective cap is completed;

[0084] Prestressed steel strand bundle threading: The ball assembly and the protective cap have been assembled with a single steel strand, and the power propulsion assembly is started. The power propulsion assembly propels the power propulsion rod to drive the steel strand end protective cap to move, and the winch rotates to release the traction line. The traction line release speed is slightly faster than the steel strand travel speed, until the power propulsion rod pushes the steel strand end protective cap to the outlet end of the corrugated pipe according to the travel distance meter monitoring travel, and the chip (single-chip microcomputer) controls the power propulsion assembly to stop pushing, and the protective cap is fixedly installed on the outside of the outlet end of the segment beam bridge corrugated pipe through the fixing jack on the top of the protective cap;

[0085] Perforation positioning: The chip (single-chip microcomputer) controls the winch to stop working, controls the power propulsion component to drive the single or multiple steel strands to pull a certain distance, and positions the single or multiple steel strands according to the fixed jack position of the steel strand end protection cap and the installation position of the anti-winding device;

[0086] Anti-twisting of steel strand: The chip (single-chip microcomputer) controls the power propulsion component to contract to the inlet end of the corrugated pipe according to the stroke measured by the stroke rangefinder. At the same time, the chip (single-chip microcomputer) controls the winch to start, and the winch pulls the anti-twisting ball back to the inlet end of the corrugated pipe through the towing rope, thus completing the positioning and anti-twisting work of a single perforation;

[0087] After all the anti-twisting balls are pulled back to the inlet end of the corrugated pipe, remove the protective cap at the end of the steel strand at the other end of the corrugated pipe, and then the steel strand threading work for the next batch can be started.

[0088] Embodiment 2:

[0089] Multiple steel strands can be fixedly connected in the protective cap at the same time to realize the threading work of multiple steel strands. In this embodiment, multiple groups of grooves and bayonets are arranged adjacent to each other in the protective cap. As Figure 6 shown, when threading the steel strands, multiple steel strands can be fixedly connected at the same time.

[0090] The construction process is the same as that of Embodiment 1, except that the number of strands of the prestressed steel strand threading is different.

[0091] Taking the above ideal embodiment based on the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A novel prestressed tendon threading device applied to segmental girder bridges, characterized in that Comprising: A power propulsion assembly (1), a through-hole pretreatment assembly (19), a protective cap (8), and a sphere assembly (7); The power propulsion assembly (1) is used to provide power for the through-hole pretreatment assembly (19) and the sphere assembly (7) while threading prestressed steel strands. The through-hole pretreatment assembly (19) is connected to the power propulsion assembly (1) and is used for linearly checking and cleaning the inner wall of the corrugated pipe. The sphere assembly (7) is installed at the end of the power propulsion assembly (1) and is used for perforation (32) positioning and linear combing of single or multiple prestressed steel strands (9); the sphere assembly (7) includes a traction rope (34) and an anti-tangling ball (31), the traction rope (34) is connected to the winch (16) of the power propulsion assembly (1), and the anti-tangling ball (31) is fixed to the threading end of the prestressed steel strand (9). The protective cap (8) is installed at the end of the sphere assembly (7) and is used to prevent scratches on the surface of the prestressed steel strand (9). The power propulsion assembly (1) includes a device body, a chip (11), a travel distance measuring instrument (18), a winch (16), and an air compressor (14). A power supply (10) is installed inside the device body. A chip (11) is installed on one side of the power supply (10). A pusher (12) is installed at the bottom of the power supply (10). An air compressor (14) is installed at the bottom of the pusher (12). An air pressure transmission pipe (3) is installed at the top of the air compressor (14). An interface (15) is provided at the end of the air pressure transmission pipe (3). A travel distance measuring instrument (18) is installed on one side of the pusher (12). A slot (13) is installed on one side of the pusher (12). Two groups of winches (16) are installed inside the device body. A rope body joint (17) is installed at the traction end of the winch (16). The chip (11) is respectively connected to the power propulsion assembly (1), the air compressor (14), and the winch (16) and is used to control the operation of the power propulsion assembly (1), the through-hole pretreatment assembly (19), and the sphere assembly (7).

2. The novel prestressed tendon threading device applied to segmental girder bridges according to claim 1, characterized in that, The travel distance measuring instrument (18) is installed at the propulsion end of the power propulsion assembly (1), and the travel distance measuring instrument (18) is connected to the chip (11).

3. A novel prestressed tendon threading device applied to segmental girder bridges according to claim 1, characterized in that, The through-hole pretreatment assembly (19) includes a power propulsion rod (2), an air pressure transmission pipe (3), a through-hole end (4), a debris removal end (5), and a linear inspection end (6) installed on the slot (13). The power propulsion rod (2) is a hollow telescopic structure with certain elasticity. The air pressure transmission pipe (3) is a high-pressure hose and is installed inside the power propulsion rod (2). The air pressure transmission pipe (3) is connected to the air compressor (14). The power propulsion rod (2) is connected to the transmission end of the power propulsion assembly (1). The through-hole end (4), the debris removal end (5), and the linear inspection end (6) are fixedly connected to the end of the power propulsion rod (2) during use.

4. A novel prestressed tendon threading device applied to segmental girder bridges according to claim 3, characterized in that, The through-hole end (4) consists of a fixed end and a pneumatic rotating head. The outer side of the pneumatic rotating head is an annular concrete grinding disc (21). The through-hole fixed end (191) is connected to the power propulsion rod (2), and the through-hole pneumatic rotating head (20) is connected to the air pressure transmission pipe (3). The diameter of the through-hole end (4) is smaller than the inner diameter of the corrugated pipe.

5. The novel prestressed tendon threading device applied to segmental girder bridges according to claim 4, characterized in that, The impurity removal end (5) includes an impurity removal fixed end (22) and an impurity removal pneumatic rotating head (23). The outer side of the pneumatic rotating head is a flexible brush (24). The through-hole fixed end (191) is connected to the power propulsion rod (2), and the through-hole pneumatic rotating head (20) is connected to the air pressure transmission pipe (3). The diameter of the impurity removal end (5) is smaller than the inner diameter of the corrugated pipe.

6. A novel prestressed tendon threading device applied to segmental girder bridges according to claim 1, characterized in that, The anti-winding ball (31) is a spherical structure. A perforation (32) runs through the anti-winding ball (31). Ball bearings are fixedly installed on the inner wall of the perforation (32). The diameter of the perforation (32) in the anti-winding ball (31) is larger than the diameter of the steel strand.

7. The novel prestressed tendon threading device applied to segmental girder bridges according to claim 6, characterized in that, The protective cap (8) is installed and fixed at the threading end of the prestressed steel strand (9) to prevent the cut end of the prestressed steel strand (9) from scratching the surface of other prestressed steel strands (9), and can be used to temporarily fix and connect the anti-winding ball (31). The protective cap (8) is a cylindrical structure. A fixed socket (30) is provided at the outer top of the protective cap (8), and several clamping grooves (28) are provided inside. Corresponding clamping openings (29) are provided on the clamping grooves (28). Spring ball bearings are installed on the inner and outer sides of the protective cap (8). The diameter of the protective cap (8) is smaller than the diameter of the corrugated pipe for threading the prestressed steel strand (9).

8. The construction process of a novel prestressed steel strand threading device applied to segmental girder bridges according to any one of claims 1-7, characterized in that S1: First, connect the power propulsion assembly (1) and the through-hole end (4) to the power propulsion rod (2) and the air pressure transmission pipe (3) respectively. Start the power propulsion assembly (1) to perform through-hole operation on the corrugated pipe. S2: By connecting the power propulsion assembly (1) and the impurity removal end (5) to the power propulsion rod (2) and the air pressure transmission pipe (3) respectively, start the power propulsion assembly (1) to perform impurity removal operation on the corrugated pipe after through-hole; and connect the power propulsion assembly (1) and the linear inspection end (6) to the power propulsion rod (2), start the power propulsion assembly (1) to perform linear inspection operation on the corrugated pipe after impurity removal, and measure the distance of the central axis of the corrugated pipe at the same time. S3: Then install the spherical assembly (7) on the single or multiple steel strands to be threaded, connect the towing rope (34) to the winch (16) in the power propulsion assembly (1), install the spherical assembly (7), and fixedly connect the single or multiple steel strands to the fixed socket (30) in the protective cap (8), and install the protective cap (8). S4: After the sphere component (7) and the protective cap (8) have been assembled with one or more steel strands, use the power propulsion component (1) to thread the assembled one or more steel strands. After the power propulsion component (1) automatically threads the one or more steel strands to the other end of the corrugated pipe, fix the end protection cap (8) of the steel strand at the tail end of the corrugated pipe. The power propulsion component (1) drives the one or more steel strands to pull back, and positions the one or more steel strands according to the position of the fixing jack (30) of the end protection cap (8) of the steel strand; S5: Finally, start the power propulsion component (1). Use the winch (16) to pull back the anti-twist balls (31) on the one or more steel strands through the towing rope (34) to the corrugated pipe threading end. After all the anti-twist balls (31) are pulled back to the corrugated pipe inlet end, remove the end protection cap (8) of the steel strand at the other end of the corrugated pipe, and then the threading work of the next batch of steel strands can begin.

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