CN206438425U - A kind of synchronous uninstalling system of suspension cable - Google Patents

Abstract

The utility model relates to the technical field of synchronous unloading of cables of cable-stayed bridges, provides a synchronous unloading system for actual construction, realizes the automation of synchronous unloading of cable-stayed cables, avoids the influence of human factors on construction, and is safe, efficient, accurate and economical. The stay cable synchronous unloading system of the utility model includes: a displacement sensor, a hydraulic cylinder, a pressure sensor, a speed regulating valve, an electric pump, an electromagnetic reversing valve, a power supply system and a control platform. The utility model can automatically and quickly realize the synchronous unloading of the four stay cables. While realizing the synchronous unloading of the stay cables, it can also feed back the construction data in real time and check with the control data to ensure the accuracy and safety of the construction process. .

Description

A cable-stayed synchronous unloading system

technical field

The utility model relates to the field of cable-stayed cable unloading, in particular to a cable-stayed cable synchronous unloading system.

Background technique

For cable-stayed bridges that have been in operation for many years, due to many reasons such as cable-stayed wire corrosion and fatigue, anchorage loosening, concrete shrinkage and creep, support settlement displacement, construction and maintenance, etc., the bridge structure has problems in terms of stress. Some potential safety hazards have caused many cable-stayed bridges built in the last century to have or face the problem of changing cables. When removing the old cable-stayed cables, due to the large tension of the cable-stayed cables, there is a greater risk of directly removing the cable-stayed cables, and when the old cable-stayed bridge has existing structures, such as the main tower, If the stay cables can be used after replacement, the dismantling of the stay cables needs to be strictly controlled. If a corresponding synchronous unloading plan for the stay cables can be formulated according to the specific structure of the stay cables, it can be safely dismantled While staying cable, it can also ensure the safety of the original structure and make it reused, which has good economic benefits.

Since the unloading process of the cable-stayed cables needs to be strictly controlled, the unloading equipment and control methods need to be precise. In the existing synchronous unloading equipment and control methods for cable-stayed cables of cable-stayed bridges, there are many problems: more workers are required on site, and the synchronous unloading In the control process, human factors have a great influence on the whole unloading, such as length measurement and oil pressure pump control, it is difficult to ensure the accuracy of construction. The most important thing for the synchronous unloading of cable-stayed cables is "synchronization", which is difficult to achieve with existing equipment Synchronization of unloading of multiple stay cables in a set of stay cables.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and provide a cable-stayed synchronous unloading system, which can reduce the number of on-site operators, and at the same time, eliminate the influence of human factors on the construction process and results, and can realize high-efficiency , Precise synchronous unloading control of stay cables.

The purpose of this utility model is achieved by the following technical solutions:

A stay cable synchronous unloading system, including a control platform, a hydraulic cylinder, a speed regulating valve, an oil pump and a power supply system, the upper end of the hydraulic cylinder is equipped with a displacement sensor for measuring and recording the stroke of the hydraulic cylinder in real time, the A signal transmitting device and a signal receiving device are installed in the displacement sensor; a pressure sensor is installed at the lower end of the hydraulic cylinder, a signal transmitting device is installed in the pressure sensor, the pressure sensor is connected with the speed regulating valve, and the regulating valve The speed valve is connected with the oil pump, the speed regulating valve is used to adjust the oil flow, so that the operating speed of the hydraulic cylinder is the set value of the control platform, and the oil pump is equipped with an electromagnetic reversing valve and a signal receiving device. The oil pump is powered by the power supply system;

The control platform is composed of a speed setting area, a stroke setting area, a cable force display area, an unloading cable force ratio setting area, a control key, a number input direction key, a number input key and a power key. The signal receiving device of the speed regulating valve transmits a signal; the stroke setting area is used to control the stroke distance of the hydraulic cylinder; the cable force display area is used to display the cable force value of the stay cable; the unloading cable force ratio The setting area is the ratio of the preset unloading cable force value of each level to the maximum cable force value, which is used to limit the unloading value of the cable force while controlling the unloading of the stay cable in stages through the length, so as to facilitate the unloading of the stay cable force in stages control; the control key is used to control the travel direction of the hydraulic cylinder through the reversing solenoid valve.

The reversing solenoid valve is provided with four gear positions of "up", "down", "stop" and "start".

The reversing solenoid valve adjusts the gear position in real time by receiving the control signal sent by the control platform.

Compared with the prior art, the beneficial effects brought by the technical solution of the utility model are:

The cable-stayed synchronous unloading system of the utility model can directly input the control data in the unloading process to the control platform, and realize signal transmission through various signal receiving and transmitting devices, realizing the automation of the cable-stayed synchronous unloading control, The unavoidable human factors in the original equipment are eliminated, the external interference factors are few, the measurement and control are accurate, the precision is high, and the unloading of the stay cables can be completed efficiently, and the system is stable and reliable, which is relatively safe, efficient and efficient compared with the original equipment. Accurate, economical, with better economic benefits.

Description of drawings

Fig. 1 is a schematic diagram of the cable-stayed synchronous unloading system of the present invention.

Fig. 2 is a schematic diagram of the operation interface of the control platform of the present invention.

Reference signs: 1-displacement sensor 2-hydraulic cylinder 3-pressure sensor 4-speed control valve 5-oil pump 6-electromagnetic reversing valve 7-power supply system 8-control platform 9-speed setting area 10-stroke setting area 11- Cable force display area 12-Unloading cable force ratio setting area 13-Control key 14-Number input direction key 15-Number input key 16-Power key

detailed description

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figures 1 and 2, a synchronous cable unloading system includes a control platform 7, a hydraulic cylinder 2, a speed control valve 4, an oil pump 5, and a power supply system 7. The cable provides four hydraulic cylinders 2, the upper end of the hydraulic cylinder 2 is equipped with a displacement sensor 1, the displacement sensor 1 can measure and record the stroke of the hydraulic cylinder 2 in real time, and the displacement sensor 1 is also equipped with a signal transmitting device and a signal receiving device , can send the recorded stroke data of the hydraulic cylinder 2 to the control platform 8, and can also receive the signal sent by the control platform 8. When the stroke of the hydraulic cylinder 2 reaches the system setting value, the signal transmitting device at the displacement sensor 1 A "stop" signal will be sent to the electromagnetic reversing valve 6, so that the hydraulic cylinder 2 will stop working;

The lower end of the hydraulic cylinder 2 is equipped with a pressure sensor 3, and a signal transmitting device is installed in the pressure sensor 3, which can send the pressure value of the pressure sensor 3 to the control platform 8 and display it in the cable force display area 11 of the control platform 8, which is related to the pressure The sensor 3 is connected to the speed control valve 4, and the speed control valve 4 is equipped with a signal receiving device. When receiving the speed signal of the control platform 8, the speed control valve 4 can adjust the oil flow, so that the operating speed of the hydraulic cylinder 2 is the control platform. 8 setpoints. The speed regulating valve 4 is connected with the oil pump 5, and the oil pump 5 is equipped with an electromagnetic reversing valve 6 and a signal receiving device, and the signal receiving device at the oil pump 5 can receive the signal from the displacement sensor 1 and the control signal from the control platform 8, and the electromagnetic The reversing valve 6 changes gear positions "up", "down", "stop" and "start" according to the signal received. The four oil pumps 5 are powered by the power supply system 7 and are controlled by the control platform 8 at the same time.

The control platform is composed of speed setting area 9, stroke setting area 10, cable force display area 11, unloading cable force ratio setting area 12, control keys 13, number input direction keys 14, number input keys 15 and power key 16.

The speed setting area 9 sends signals to the signal receiving device at the speed control valve 4; the stroke setting area 10 can control the "up" and "down" stroke distances of the hydraulic cylinder 2. When the stroke of the hydraulic cylinder 2 reaches the set value, the displacement sensor 1 signal transmitting device will send a "stop" signal to the 6 signal receiving devices of the electromagnetic reversing valve, so that the hydraulic cylinder 2 stops working; the 11th area of the cable force display is the calibrated data of the hydraulic calibration system, that is, the cable force value of the cable stay, It is convenient for the on-site personnel to obtain the cable force of the cable stay in real time; the unloading cable force ratio setting area 12 is for the on-site control personnel according to the classification unloading requirements, the preset ratio of the unloading cable force value of each level to the maximum cable force value, so that when the length is controlled The unloading value of the cable force is limited at the same time as the staged unloading of the stay cables, which is convenient for the precise control of the staged unloading of the cable force of the stay cables, and is beneficial to the protection of the original main tower structure; the control key 13 is a signal for the direction of travel of the hydraulic cylinder 2 Sending end: digital input direction key 14 is convenient for controlling different digital input areas.

The control of the stay cable synchronous unloading system requires two stages. In the first stage, a single stay cable is jacked up so that the force of the stay cable is transferred to the hydraulic cylinder. First, the power supply system 7 is connected, and then The speed setting area 9 of the control platform 8 is to input the speed value (determined according to experience) corresponding to the area corresponding to the stay cable for the jacking operation, and the other control data is the default value of the control platform system is 0, and the control platform 8 sends a signal to the speed regulating valve 4. The speed regulating valve 4 adjusts the oil flow according to the signal. Click the "Up" key in the control key 13, and then click the "Start" key, the control platform 8 sends a signal to the electromagnetic reversing valve 6, the electromagnetic reversing valve 6 adjusts the gear according to the signal, and the hydraulic cylinder 2 starts to work. On the cable-stayed bridge tower, there is a special person at the anchorage end of the cable-stayed cable to check whether the nut at the anchorage end can rotate during the lifting process of the hydraulic cylinder 2. Once it is found that the nut can just rotate, click the "stop" button in the control key 13 immediately, The control platform 8 sends a signal to the electromagnetic reversing valve 6, and the electromagnetic reversing valve 6 adjusts the gear position according to the signal, and the hydraulic cylinder stops working. At this time, the cable force value displayed in the cable force display area of the control platform is the maximum value F ₀ , and the first stage of work of the stay cable is completed. Repeat the above operations to complete the first stage work of the other three stay cables.

The second phase of the control of the cable-stayed synchronous unloading system is as follows: firstly, connect the power supply system 7, according to the monitoring command, that is, the tension value of each level of the four cable-stayed cables, calculate and complete unloading at the same time, each hydraulic pressure The operating speed of the cylinder 2 is input in the speed setting area 9 of the control platform 8, and the control platform 8 sends a signal to the speed regulating valve 4, and the speed regulating valve 4 adjusts the oil flow according to the signal. Put the input of the tensor into the stroke setting area 10. In order to ensure the safety of the construction process, according to the number of grades of monitoring instructions from the monitoring party, determine the proportional value of the unloading cable force at this level, and input it into the unloading cable force ratio setting area 12. . Click the "down" and "start" keys in the control keys 13, the control platform 8 sends a signal to the electromagnetic reversing valve 6, the electromagnetic reversing valve 6 adjusts the gear according to the signal, and the hydraulic cylinder 2 starts to work. The displacement sensor 1 records the stroke of the hydraulic cylinder in real time, and feeds the data back to the control platform 8 , and the system of the control platform 8 automatically compares the stroke data of the hydraulic cylinder with the data set in the stroke setting area 10 . At the same time, the pressure sensor 3 feeds back the cable force value to the cable force display area 11, and the control platform 8 system automatically calculates value, and compare it with the data in the unloading cable force ratio setting area 12. When the stroke of the hydraulic cylinder reaches the data in stroke setting area 10 or When the value reaches the ratio value in the unloading cable force ratio setting area 12, the control platform 8 automatically sends a "stop" signal to the electromagnetic reversing valve 6, and the electromagnetic reversing valve 6 adjusts the gear according to the signal, and the four hydraulic cylinders stop working at the same time. The second phase of synchronous unloading of the stay cables has been completed. Repeat the above operations, and perform the uninstallation of the next level according to the instructions in the monitoring, and guide the completion of all the uninstallation work.

The specific steps for the control method that needs to unload four stay cables synchronously are as follows:

The first stage: perform separate operations on the four stay cables to be unloaded, and transfer the force of the stay cables to the hydraulic cylinder. The specific control process is as follows:

(1) Connect the power to the whole system, click the "off/on" button on the control platform, that is, the power button, and turn it on;

(2) In the speed setting area of the control platform, firstly input a value in the speed setting area corresponding to the cable to be lifted (at this stage, the value can be determined according to experience), and do not input the values in the other speed setting areas, and the speed setting area If no value is entered, the system defaults to zero, that is, the corresponding hydraulic system does not work;

(3) Click the "up" button to indicate that the hydraulic cylinder is running in the jacking direction;

(4) Click "Start", at this time, the hydraulic cylinder starts to run;

(5) During the operation of the hydraulic cylinder, set up a special person at the anchorage end of the cable-stayed tower to check whether the nut can be rotated. If the nut cannot be rotated, do nothing. ” key, the system stops working. At this time, the cable force value in the cable force display area of the control platform is the maximum value F ₀ , and F ₀ will be used as the initial value of the cable force in the second stage. The first phase of work for this stay cable is completed;

(6) Repeat steps (2)-(5) to complete the first phase of work for the four stay cables.

The second stage is the synchronous unloading stage of the four stay cables. In particular, it is pointed out that the force of the four stay cables is different. The tensor value is different, so the speed value set in the speed setting area is different, which is also the difference between the "synchronous" unloading of the stay cable in the utility model and other synchronous tensioning and unloading devices and systems. The specific control process is as follows:

(1) Connect the power to the whole system, click the "off/on" button on the control platform, and start the machine;

(2) According to the tensor value of the group of four stay cables given by the monitoring command, under the premise that the unloading is completed at the same time, calculate the speed value of the speed setting area corresponding to each stay cable, and input it to complete the speed set up;

(3) According to the tensor value of the group of four stay cables given by the monitoring command, input correspondingly in the stroke setting area of the control platform to complete the stroke setting;

(4) Click "down", the control platform sends a signal, and the signal receiving device at the electromagnetic reversing valve receives the signal, and changes the gear position according to the signal;

(5) Click "Start", the whole system starts to run, and the four groups of hydraulic cylinders descend to unload;

(6) The above-mentioned displacement sensor records and feeds back the stroke of the hydraulic cylinder in real time. If the stroke does not reach the set stroke value, the control platform does not respond. When the hydraulic cylinder stroke just reaches the stroke set value, the control platform sends a "stop ” signal, the signal receiving device at the electromagnetic reversing valve receives the signal, and changes the gear position according to the signal, and the four hydraulic cylinders stop working at the same time; while the hydraulic cylinders are running, the cable force value F ₁ will be displayed in real time, and the control platform system will be calculated automatically Value, compared with the cable force proportional setting value, when the value reaches the proportional setting value, the control platform will also send a "stop" signal to make the hydraulic cylinder stop working;

(7) As long as the stay cable synchronous unloading system stops working, it means that the level unloading has been completed.

(8) Repeat (1)—(6) according to the unloading classification requirements of the monitoring party until all the four stay cables in the group are unloaded.

The present invention is not limited to the embodiments described above. The above description of specific embodiments is intended to describe and illustrate the technical solution of the present utility model, and the above specific embodiments are only illustrative and not restrictive. Without departing from the purpose of the utility model and the scope protected by the claims, those skilled in the art can also make many forms of specific transformations under the inspiration of the utility model, and these all belong to the protection scope of the utility model Inside.

Claims (3)

1. A stay cable synchronous unloading system is characterized in that it comprises a control platform, a hydraulic cylinder, a speed regulating valve, an oil pump and a power supply system, and the upper end of the hydraulic cylinder is equipped with a device for measuring and recording the stroke of the hydraulic cylinder in real time. The displacement sensor is equipped with a signal transmitting device and a signal receiving device; the lower end of the hydraulic cylinder is equipped with a pressure sensor, and a signal transmitting device is installed in the pressure sensor, and the pressure sensor is connected with the speed regulation The speed regulating valve is connected with the oil pump, the speed regulating valve is used to adjust the oil flow, so that the operating speed of the hydraulic cylinder is the set value of the control platform, and the oil pump is equipped with an electromagnetic reversing valve and a signal receiving device, the oil pump is powered by the power supply system; The control platform is composed of a speed setting area, a stroke setting area, a cable force display area, an unloading cable force ratio setting area, a control key, a number input direction key, a number input key and a power key. The signal receiving device of the speed regulating valve transmits a signal; the stroke setting area is used to control the stroke distance of the hydraulic cylinder; the cable force display area is used to display the cable force value of the stay cable; the unloading cable force ratio The setting area is the ratio of the preset unloading cable force value of each level to the maximum cable force value, which is used to limit the unloading value of the cable force while controlling the unloading of the stay cable in stages through the length, so as to facilitate the unloading of the stay cable force in stages control; the control key is used to control the travel direction of the hydraulic cylinder through the reversing solenoid valve. 2 . A synchronous unloading system for stay cables according to claim 1 , wherein the reversing solenoid valve is provided with four gear positions of "up", "down", "stop" and "start". 3. A stay cable synchronous unloading system according to claim 1 or 2, characterized in that the reversing solenoid valve adjusts the gear position in real time by receiving the control signal sent by the control platform.