Stay cable tensioning automatic locking device

Abstract

According to the stay cable tensioning automatic locking device, a power device and a reduction gearbox are fixedly installed on a supporting foot, and a transmission gear shaft is fixed to an output shaft of the reduction gearbox; the gear ring is sleeved on the nut and is fixedly connected with the set screw through a flat key; the transmission gear shaft is meshed with the gear ring to form gear transmission, and a data input unit is arranged and used for inputting and setting parameters including a designed tensioning force F set, a locking starting displacement set value S set and a locking torque set value M set; the data acquisition unit is used for acquiring a displacement value measured by the displacement sensor and a torque value measured by the torque sensor; and the automatic locking and loading control unit is used for sending an instruction to the power device according to the collected displacement value and torque value so as to implement locking action. The automatic locking device has the advantages that automatic locking of the tensioning nut is achieved, inhaul cable tensioning safety accidents are avoided, efficiency is high, and labor cost is low.

Description

Technical Field

[0001] This utility model relates to the field of prestressing technology, specifically to an automatic locking device for tensioning cable-stayed bridges. Background Technology

[0002] In the tensioning of parallel wire cables in cable-stayed bridges, a tensioning rod is typically connected to the cable anchor cup, with a nut fitted over the anchor cup. A hydraulic pump station then drives a jack to tension the tensioning rod. After tensioning to the desired position, the nut is rotated to lock the tension force. During tensioning, because the cables are usually very long, multiple strokes are required to reach the set tension force. The existing tensioning method involves stopping the machine after each stroke, manually tightening the nut to lock the tension force, and then repeating this process multiple times until the design tension force is reached. This method has the following shortcomings:

[0003] 1. If the tensioning jack suddenly fails, the cable will retract instantly, causing the locking nut to impact the anchor box, posing a great safety threat to the components and workers.

[0004] 2. Manually tightening the nuts results in a large workload and incomplete tightening.

[0005] 3. The machine must be stopped after each stretch, and continuous tensioning is not possible, resulting in low efficiency. Utility Model Content

[0006] The purpose of this invention is to provide an automatic locking device for cable tensioning that automatically locks the nut during cable tensioning, promptly locks the tension force, improves construction quality, avoids cable tensioning safety accidents, and reduces manual workload; it also enables continuous tensioning without stopping the machine, thus improving construction efficiency.

[0007] The technical solution disclosed in this utility model is:

[0008] An automatic locking device for cable tensioning includes a power unit, a reduction gearbox, a transmission gear shaft, a gear ring, a torque sensor, a displacement sensor, and a control center. The power unit and the reduction gearbox are fixedly mounted on the support legs, and the transmission gear shaft is fixed to the output shaft of the reduction gearbox. The gear ring is fitted onto a nut and is connected and fixed by a flat key and a set screw. The transmission gear shaft and the gear ring mesh to form a gear transmission. When the nut is in contact with the anchor box, the distance between the nut and the upper end of the gear ring and the reduction gearbox is greater than the stroke of the jack piston.

[0009] As a preferred embodiment, the control center is equipped with:

[0010] (1) Data input unit: used to input and set parameters, including the design tension F 设 Locking start displacement setting value S 设 Locking torque setting value M设 ;

[0011] (2) Data acquisition unit: used to acquire displacement values ​​measured by displacement sensors and torque values ​​measured by torque sensors;

[0012] (3) Automatic locking loading control unit: Based on the collected displacement and torque values, it sends a command to the power unit to perform the locking action.

[0013] The advantages of this invention are that it enables automatic locking of tension nuts, avoids cable tensioning safety accidents, and is highly efficient with low labor costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the installation of the automatic locking device for cable tensioning of this utility model.

[0015] Figure 2 This is a structural diagram of the gear ring and nut of the automatic locking device for cable tensioning of this utility model.

[0016] Figure 3 This is a schematic diagram of the present invention in its initial working state.

[0017] Figure 4 This is a schematic diagram of the working state of this utility model under tension.

[0018] Figure 5 This is a schematic diagram of the present invention in the locked state.

[0019] Figure 6 This is a schematic diagram of the present invention in the working state after tensioning is completed.

[0020] In the attached diagram: 1-Control center, 2-Tensioning rod, 3-Anchor, 4-Jack, 5-Power unit, 6-Gearbox, 7-Torque sensor, 8-Transmission gear shaft, 9-Gear ring, 10-Nut, 11-Anchor box, 12-Support leg, 13-Anchor cup, 14-Displacement sensor, 15-Flat key, 16-Jack piston, 17-Set screw. Detailed Implementation

[0021] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0022] Please refer to Figure 1 , Figure 2 and Figure 3This utility model includes a power unit 5, a reduction gearbox 6, a transmission gear shaft 8, a gear ring 9, a torque sensor 7, a displacement sensor 14, and a control center 1. The power unit 5 is mounted on the support legs, and the transmission gear shaft 8 is fixed to the output shaft of the reduction gearbox 6. The power unit 5 is used to drive the transmission gear shaft 8 to rotate. The reduction gearbox 6 is used to adjust the rotational speed of the transmission gear shaft 8 to improve the locking accuracy. The gear teeth of the transmission gear shaft 8 mesh with the gear ring 9, which not only transmits torque to the gear ring 9, but also forms a structure that allows the gear ring 9 to slide along the tooth groove of the transmission gear shaft 8. The gear ring 9 is fitted onto the nut 10 and connected by a flat key 13, and fixed to the nut 10 by a set screw 17, which is used to transmit torque to the nut 10. When the nut 10 is in contact with the anchor box 11, the distance s between the nut 10 and the upper end of the gear ring 9 and the reduction gearbox 7 is greater than the stroke of the piston of the jack 4. The torque sensor 7 is used to measure the torque of the transmission gear shaft 8 and transmit it to the control center 1 in real time. The displacement sensor 14 is used to measure the displacement of the nut 10 and transmit it to the control center 1 in real time. The control center 1 is integrated into the intelligent tensioning system and is used to process data and issue control commands.

[0023] The control center is equipped with:

[0024] (1) Data input unit: used to input and set parameters, including the design tension F 设 Locking start displacement setting value S 设 Locking torque setting value M 设 ;

[0025] (2) Data acquisition unit: used to acquire displacement values ​​measured by displacement sensors and torque values ​​measured by torque sensors;

[0026] (3) Automatic locking loading control unit: Based on the collected displacement and torque values, it sends a command to the power unit to perform the locking action.

[0027] One method for implementing this utility model is as follows:

[0028] like Figure 1 Install the equipment as shown, and tighten nut 10 all the way to make it contact the anchor box, as shown. Figure 3 As shown. Then, set the parameters in control center 1, including: tension force F. 设 Locking start displacement setting value

[0029] S 设 Locking torque setting value M 设 Then, the equipment is started for tensioning. During the tensioning process, displacement sensor 14 monitors the real-time displacement S of nut 10. 实The data is transmitted to control center 1, where the pressure sensors of the intelligent tensioning system simultaneously monitor the real-time tension force F. 实 Control Center 1 will send S in real time 实 Value and S 设 In comparison, F 实 With F 设 In comparison, and based on the comparison results, the following control strategies are adopted:

[0030] (1) Before the tension reaches the design tension, i.e., F 实 <F 设 When the real-time displacement value of nut 10 reaches the locking start displacement set value, i.e., S 实 ≥S 设 ,like Figure 4 As shown, control center 1 issues a command, power unit 5 starts, and begins locking; during the locking process, torque sensor 7 measures the torque M of transmission gear shaft 8 in real time. 实 And transmit it to control center 1. When the real-time torque reaches the locking torque set value, i.e., M 实 ≥M 设 ,like Figure 5 As shown, control center 1 issues a command to stop locking, and waits until S is reached again. 实 ≥S 设 Then, tighten again. Continue this process until the tension reaches the design tension. After tightening, return the jack to its original position to end the tensioning process. Figure 6 As shown.

[0031] (2) When the tension reaches the design tension, when F 实 ≥F 设 At that time, regardless of S 实 Has it reached S? 设 Control center 1 sends locking commands to lock the device until M. 实 ≥M 设 Stop, complete tensioning and locking.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A stay cable tensioning automatic locking device, characterized by: The device includes a power unit, a reduction gearbox, a transmission gear shaft, a gear ring, a torque sensor, a displacement sensor, and a control center. The power unit and the reduction gearbox are fixedly mounted on the support legs, and the transmission gear shaft is fixed to the output shaft of the reduction gearbox. The gear ring is fitted onto a nut and connected and fixed by a flat key and a set screw. The transmission gear shaft and the gear ring mesh to form a gear transmission. When the nut is in contact with the anchor box, the distance between the nut and the upper end of the gear ring and the reduction gearbox is greater than the stroke of the jack piston.

2. The stay cable tensioning automatic locking device according to claim 1, characterized in that: The control center is equipped with: (1) Data input unit: for inputting and setting parameters, including design tension F 设 , locking start displacement setting value S 设 , locking torque setting value M 设 ; (2) Data acquisition unit: used to acquire displacement values ​​measured by displacement sensors and torque values ​​measured by torque sensors; (3) Automatic locking loading control unit: Based on the collected displacement and torque values, it sends a command to the power unit to perform the locking action.

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