CN113589735A - Wireless multi-point prestress collaborative tensioning control system - Google Patents
Wireless multi-point prestress collaborative tensioning control system Download PDFInfo
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Abstract
The invention relates to a wireless multipoint prestress collaborative tensioning control system which comprises a main controller and two or more prestress tensioning devices, wherein the main controller is connected with the prestress tensioning devices and comprises a central processing module, a wireless communication module, a display module, a storage module, a touch operation module and an alarm module; the prestress tensioning equipment comprises a jack, a driving device, a displacement sensor, a pressure sensor, a data processor, a secondary controller and a power switch; the invention overcomes the defects of large measurement error, low control precision, lack of data monitoring for the tensioning process and low construction efficiency caused by human factors in the prior art, realizes the full-automatic control of a computer, has high control precision for the tensioning process, coordinates the tensioning at multiple points, synchronously corrects the tensioning, monitors and feeds back the data in real time, and has high tensioning efficiency and relatively low cost.
Description
Technical Field
The invention relates to the technical field of prestress tensioning, in particular to a wireless multipoint prestress collaborative tensioning control system.
Background
The prestress tensioning means that tension is added in advance in a component, so that the applied prestress tensioning component bears compressive stress, and further generates certain deformation to deal with the load of the structure, including the load of the self weight of the component, wind load, snow load, earthquake load action and the like. Generally, the steel strand, the jack, the anchor plate and the clamping piece are used for tensioning. Before the engineering structural member bears external load, pretension stress is applied to the steel strands in the tension module, the bending resistance and rigidity of the member are improved, the occurrence time of cracks is delayed, and the durability of the member is improved. In terms of mechanical structure, the term "prestressing" means that the tensile modules are subjected to a stress, which has the advantage of increasing the rigidity of the structure itself and of reducing vibrations and elastic deformations, which significantly improves the elastic strength of the tensile modules and makes them more resistant.
In the prior prestressed tensioning, particularly during multipoint prestressed tensioning, a high-pressure oil pump is mainly controlled manually to control the operation of a tensioning jack, and the tensioning conditions of all points are monitored manually, so that the synchronism, the load holding time and the tensioning control stress in the tensioning process cannot be effectively controlled. Adopt many stretch-draw equipment, with intercom transmission information, according to the reading of oil pump manometer through the stretch-draw personnel, contrast corresponding pulling force value, judge whether reach the pulling force, hardly guarantee real-time information feedback, the error is great, and simultaneously, every stretch-draw equipment all will solitary engineering technical personnel control, and the construction progress is slow, and many the uniformity that can't guarantee the construction progress of being under construction simultaneously, seriously influence the efficiency of construction.
At present, the construction quality of prestress tensioning is uneven, process control technology and equipment are lacked, and even if problems are found after tensioning, the problems are difficult to remedy. The control precision of effective prestress of construction tensioning is poor, and comprises the control precision of the tensioning stress and the tensioning elongation in the tensioning process and the synchronous precision of the tensioning, load holding and unloading processes of jacks at two ends in the tensioning process, once the prestress tensioning precision is out of control, longitudinal cracks and inverted arches at an anchoring end of the structure are caused to occur if the prestress tensioning precision is light, and accidents such as transverse cracks and prestressed tendon breaking occur if the prestress tensioning precision is heavy; the prestress tensioning process is lack of effective monitoring, cracking and downbearing phenomena exist in more bridges in service in China, and the main reason is lack of effective control over prestress tensioning quality through a large number of surveys and detections, so that even if problems such as excessive prestress loss or overload are found, the problems are difficult to remedy. For example, in the suwan bridge and the wiring engineering, the suwan bridge is a double-tower double-cable-plane cable-stayed bridge, the full bridge has 160 cable-stayed cables, the two cable planes are in an oblique crossing type, the cable guide pipes have crossing angles in the horizontal direction, the cable guide pipes at different positions have different crossing angles, and the requirement on the positioning accuracy of the cable guide pipes is high. Meanwhile, the stay cable is a finished product whole bundle cable, the weight of a single cable is large, and the single cable needs to be tensioned for 3 times, so that the effective control on the prestress tensioning quality in time has important influence on the smooth progress of the engineering.
Chinese patent CN 245761 discloses an intelligent control prestress tensioning device, which is characterized in that a signal acquisition component and a corresponding signal processing device are additionally arranged, so that the prestress tensioning process is digitized, the construction human factors of a prestressed structure are reduced, and the tensioning precision of the prestressed structure is improved. Chinese patent CN1212464C discloses a full-automatic prestressed tensioning device, which comprises a tensioning jack driven by an oil pump, a force sensor, a displacement sensor and a control assembly of the tensioning device, wherein an electromagnetic valve controlled by the control assembly of the tensioning device is arranged in an oil supply path of the oil pump, and the force sensor comprises a ground force sensing elastic member with a strain gauge fixed on the outer surface thereof and a top head with a prestressed rib hole positioned in the force sensing elastic member. The prestress tensioning scheme provided by the patent application is controlled by a single chip microcomputer, the tensioning precision can only be ensured within the range of 1%, the A/D conversion precision of the single chip microcomputer is limited, the prestress tensioning process is lack of effective monitoring, and the application of the scheme is further limited.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a wireless multipoint prestress cooperative tensioning control system which is controlled by a computer in a full-automatic manner, has high control precision, is used for multipoint cooperative tensioning, synchronously proofreads tensioning, monitors and feeds back real-time data, has high tensioning efficiency and relatively low cost, and adopts the technical scheme as follows:
a wireless multipoint prestress collaborative tensioning control system comprises a main controller and two or more prestress tensioning devices, wherein the main controller is connected with the prestress tensioning devices;
the prestress tensioning equipment comprises a jack, a driving device, a displacement sensor, a pressure sensor, a data processor, a secondary controller and a power switch; the secondary controller is connected with the data processor, the data processor is connected with the driving device, the driving device is connected with the jack, and the power switch is respectively connected with the secondary controller and the driving device.
Preferably, limiting plate is connected to jack one end, and connect with the prestressing tendons that treats stretch-draw member matching, and the instrument anchor is connected to the other end, the limiting plate is connected displacement sensor, the jack is connected pressure sensor, data processor connects respectively displacement sensor and pressure sensor.
Preferably, the main controller comprises a central processing module, a wireless communication module, a display module, a storage module, a touch operation module and an alarm module, wherein the central processing module is respectively connected with the wireless communication module, the display module, the storage module, the touch operation module and the alarm module.
Preferably, the main controller is provided with a printing interface and a USB interface.
Preferably, drive arrangement includes solenoid valve, oil pump and motor, the oil pump with through oil piping connection between the jack, be equipped with the solenoid valve on the oil pipe, the solenoid valve with data processor connects, the oil pump with the motor is connected, be equipped with the manometer on the oil pump.
Preferably, the pressure sensor is arranged at an oil inlet or an oil outlet in the jack, and the pressure sensor is a resistance strain gauge with high precision and high stability.
Preferably, the main controller is connected with a mobile phone terminal or a remote computer through a wireless network.
Preferably, the secondary controller comprises a wireless communication interface, a display screen, a control chip and an alarm, the control chip is respectively connected with the wireless communication interface, the display screen and the alarm, and the secondary controller performs data transmission with the main controller through the wireless communication interface.
Preferably, the secondary controller further comprises a data storage unit and a data detection unit, the data storage unit is used for storing working parameters of corresponding jacks, the data detection unit is used for detecting the working parameters of the jacks, the data storage unit is connected with the data detection unit, the data storage unit and the data detection unit are respectively connected with the control chip, and the data detection unit is connected with the alarm. According to another technical scheme, the wireless multipoint prestress collaborative tensioning control method comprises the following steps:
s1, starting a main controller and a prestress tensioning device, inputting and storing working parameters into the main controller, wherein the working parameters comprise a tensioning parameter, a tensioning stress limit value, a tensioning elongation limit value and a tensioning stress control value;
s2, the main controller sends a tensioning instruction and working parameters to each secondary controller, the secondary controllers receive the instruction and store the working parameters, the secondary controllers send the instruction, the driving device is started, and the jack is driven to stretch;
s3, the data processor collects data obtained by the displacement sensor and the pressure sensor, the data are converted through a formula to obtain stretching elongation and stretching stress, the converted data are transmitted to the secondary controller, and the secondary controller analyzes and processes the data and sends the data to the main controller;
s4, the main controller judges whether the tensile stress of each prestressed tension device in the step S3 reaches the tensile stress control value set in the step S1, if so, the next step is continued, and if not, the next step is continued to the step S2 and the driving device is controlled to pressurize;
if the tensile stress exceeds the tensile stress limit value of the step S1 or the tensile elongation exceeds the tensile elongation limit value, a fault alarm is given, and the tensioning is stopped;
if the difference exists between the tension stresses of the pre-stressed tension devices and is more than 2%, executing a correction command;
and S5, recording the stretching elongation and the stretching stress of each prestressed stretching device by the main controller, and simultaneously sending a closing signal to each secondary controller to stop the stretching operation.
The beneficial technical effects obtained by the invention are as follows:
1) the invention solves the defects of large measurement error, low control precision, lack of data monitoring for the tensioning process and low construction efficiency caused by human factors in the prior art, realizes the full-automatic control of a computer, has high control precision for the tensioning process, coordinates the tensioning at multiple points, synchronously corrects the tensioning, monitors and feeds back the data in real time, and has high tensioning efficiency and relatively low cost;
2) the invention realizes visual operation by forming a human-computer interaction interface by the display module and the touch operation module, acquires the tensioning data of each prestressed device by the secondary controllers and transmits the tensioning data to the main controller in real time, the main controller records the tensioning stress and the tensioning elongation value in the multipoint prestress tensioning process in real time, establishes a change curve graph, and effectively monitors the data of the tensioning process, thereby avoiding the problem of large measurement error caused by human factors and improving the tensioning control precision;
3) according to the invention, by arranging the alarm device, when the main controller detects that the tension stress and the tension elongation reach or exceed the preset control range, the main controller sends an instruction to the alarm module, gives an alarm corresponding to the alarm, and automatically stops the tension, so that the accident that the tension of the prestressed tendons is out of control is effectively avoided, and the operation safety is improved;
4) the invention realizes the prestress tensioning cooperative control by synchronously tensioning each prestress and synchronously calibrating the tensioning process, and when the main controller detects that the tensioning is asynchronous, the main controller corrects the tensioning in time, thereby being convenient for adjusting the tensioning parameters to control, realizing the automatic control of the tensioning process and being not influenced by human factors.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a wireless multi-point prestress cooperative tensioning control system according to the present invention;
FIG. 2 is a schematic structural view of the pre-stress tensioning apparatus of the present invention;
FIG. 3 is a schematic diagram of a main controller according to the present invention;
FIG. 4 is a schematic structural diagram of the controller according to the present invention;
fig. 5 is a flowchart of a wireless multipoint prestress collaborative tensioning control method according to the present invention.
In the above drawings: 1. a main controller; 2. a data processor; 3. a power switch; 4. a jack; 5. a displacement sensor; 6. a limiting plate; 7. a pressure sensor; 8. a tool anchor; 9. a motor; 10. an oil pump; 11. an electromagnetic valve; 12. a pressure gauge; 13. a printing interface; 14. a USB interface; 15. a secondary controller; 16. a central processing module; 17. a touch operation module; 18. a wireless communication module; 19. a display module; 20. a storage module; 21. an alarm module; 22. a control chip; 23. a display screen; 24. a wireless communication interface; 25. pre-stress tensioning equipment; 26. an alarm.
Detailed Description
Technical solutions of the present invention will be described in detail below by way of embodiments with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.
Example 1
As shown in fig. 1, a wireless multipoint prestress collaborative tensioning control system comprises a main controller 1 and two or more prestress tensioning devices 25, wherein the prestress tensioning devices 25 are connected with the main controller 1;
as shown in fig. 2, the prestress tension device 25 includes a jack 4, a driving device, a displacement sensor 5, a pressure sensor 7, a data processor 2, a secondary controller 15 and a power switch 3; the secondary controller 15 is connected with the data processor 2, the data processor 2 is connected with the driving device, the secondary controller 15 controls the operation of the driving device through the data processor 2, the driving device is connected with the jack 4, and the driving device provides power for the jack 4 to drive the jack 4 to operate; the power switch 3 is respectively connected with the secondary controller 15 and the driving device, the power switch 3 is turned on, the secondary controller 15 is started, the driving device is powered on, and the standby state is achieved.
One end of a jack 4 is connected with a limiting plate 6 and is connected with a prestressed tendon matched with a member to be tensioned, the other end of the jack is connected with a tool anchor 8, the limiting plate 6 is connected with a displacement sensor 5 through a connecting piece, the displacement sensor 5 is used for obtaining the displacement of a piston of the jack 4 in the tensioning process, the jack 4 is connected with a pressure sensor 7, the pressure sensor 7 is used for obtaining the pressure of hydraulic oil, the displacement sensor 5 and the pressure sensor 7 are both connected with a data processor 2, the data processor 2 carries out data acquisition through the displacement sensor 5 and the pressure sensor 7, and the data processor 2 carries out conversion method through presetting, the stretching elongation and the stretching stress in the stretching process are calculated through the collected data, the data are transmitted to the secondary controller 15, the secondary controller 15 transmits the data to the main controller 1, and the main controller 1 analyzes and processes the received data.
As shown in fig. 3, the main controller 1 includes a central processing module 16, a wireless communication module 18, a display module 19, a storage module 20, a touch operation module 17, and an alarm module 21, wherein the central processing module 16 is connected to the wireless communication module 18, the display module 19, the storage module 20, the touch operation module 17, and the alarm module 21, respectively.
The wireless communication module 18 includes a wireless single chip and its peripheral circuits, and implements the functions of receiving and transmitting signals.
The central processing module 16 is connected with the secondary controller 15 through the wireless communication module 18, the central processing module 16 is used for analyzing and processing data, an operator inputs working parameters including tension parameters, tension stress limit values and tension stress control values through the touch operation module 17 and puts the working parameters into the storage module 20, the central processing module 16 analyzes and confirms the input working parameters firstly and sends instructions to the secondary controller 15, and the secondary controller 15 controls the tension process after receiving the instructions.
The display module 19 displays the data transmitted by the secondary controller 15 in real time, and is provided with two modes of curve graph display and numerical value display, so that an operator can switch display at any time, and the real-time monitoring of the data in the tensioning process is realized.
When the central processing module 16 detects that the stretching elongation or the stretching stress in the stretching process reaches or exceeds a limit value, an instruction is sent to the alarm module 21, the alarm mode comprises a light prompt mode, a sound prompt mode or a simultaneous prompt mode, a prompt signal is sent to an operator, the fault prestress stretching equipment 25 can be conveniently processed, meanwhile, the central processing module 16 has an automatic reporting and stopping function, a stopping instruction is sent to the existing problem prestress stretching equipment 25, and the prestress stretching equipment 25 automatically stops working.
In one embodiment, the alarm module 21 includes two or more alarms, each corresponding to one of the prestressed tensioning devices 25, and when one or more of the prestressed tensioning devices 25 is detected to be out of order, the corresponding alarm gives an alarm.
When the central processing module 16 detects that the stretching elongation or the stretching stress in the stretching process reaches or exceeds the control value, a stop instruction is sent to the secondary controller 15 to stop the stretching action at the moment, so that the self-protection function of the system is realized.
When the central processing module 16 detects that the tension stress of each pre-stressed tension device 25 in the tension process has a difference value, and the difference value is more than 2%, a correction instruction is sent, the pre-stressed tension device 25 with a large tension stress value stops accelerating, the tension stress is kept unchanged, the pre-stressed tension device 25 with a small tension stress value continues accelerating, and the synchronous tension acceleration is carried out until the tension stress is the same.
The main controller 1 is provided with a printing interface 13 and a USB interface 14, the printing interface 13 is connected with a micro printer in the main controller 1, so that data collected in the tensioning process can be printed conveniently, and the USB interface 14 is convenient for exporting the data collected in the tensioning process to the mobile data storage device.
In one embodiment, the printing interface 13 is externally connected with a printer, so as to print out the data acquired during the tensioning process.
As shown in fig. 4, the secondary controller 15 includes a wireless communication interface 24, a display screen 23, a control chip 22 and an alarm 26, the control chip 22 is connected to the wireless communication interface 24, the display screen 23 and the alarm 26, the secondary controller 15 performs data transmission with the main controller 1 through the wireless communication interface 24, when the prestressed tensioning device 25 corresponding to the secondary controller 15 fails, the alarm 26 sends an alarm signal to prompt an operator to perform processing, and the display screen 23 is used for displaying a parameter value of the tensioning process of the prestressed tensioning device 25 in real time.
The wireless communication interface 24 includes a wireless single chip and its peripheral circuits, and implements the functions of receiving and transmitting signals.
In one embodiment, the secondary controller 15 further includes a data storage unit and a data detection unit, the data storage unit is configured to store working parameters corresponding to the jack 4, the data detection unit is configured to detect the working parameters of the jack 4, the data storage unit is connected to the data detection unit, the data storage unit and the data detection unit are respectively connected to the control chip 22, the data detection unit is connected to the alarm 26, when it is detected that a parameter value of the jack 4 in the tensioning process exceeds a limit value of the prestress tensioning device 25, an alarm signal is automatically sent, and the secondary controller 15 sends a stop instruction, so as to effectively avoid occurrence of a dangerous accident.
The working process is as follows:
the main controller 1 sends a command to the secondary controller 15 through the wireless communication module 18, the secondary controller 15 controls the prestress tensioning equipment 25 to perform tensioning operation, the control chip 22 receives the command and then transmits the command to the data processor 2, further the tensioning of the member to be tensioned is controlled by driving the jack 4, the data processor 2 performs data acquisition through the displacement sensor 5 and the pressure sensor 7, the data processor 2 converts the data acquired by the sensor through a preset conversion method to obtain the tensioning elongation and the tensioning stress in the tensioning process, then transmits the data to the control chip 22, the control chip 22 on one hand sends the data to the display screen 23, the display screen 23 displays the variation data of the tensioning elongation and the tensioning stress in real time, the control chip 22 on the other hand sends the data to the main controller 1 through the wireless communication interface 24, and the data are analyzed and stored by the main controller 1, and simultaneously comparing the tension synchronicity of the pre-stressed tension devices 25, if the tension stress has a difference value which is more than or equal to 2%, carrying out corresponding correction operation, and if the tension stress control value is reached, stopping the tension.
In one embodiment, the data processor 2 sends a command to the driving device to drive the jack 4 to perform the tensioning operation, and the command sent by the data processor 2 to the driving device is a level signal command.
Drive arrangement includes solenoid valve 11, oil pump 10 and motor 9, through oil piping connection between oil pump 10 and the jack 4, be equipped with solenoid valve 11 on the oil pipe, solenoid valve 11's control end is connected with data processor 2, opening of data processor 2 control solenoid valve 11, and then the oil mass of control from oil pump 10 entering hydro-cylinder, oil pump 10 is connected with motor 9, motor 9 drives oil pump 10 and operates, be equipped with manometer 12 on the oil pump 10, the pressure reading is looked over at the scene of being convenient for, realize artifical check-up.
In one embodiment, the number of the electromagnetic valves 11 is two, the oil cylinder of the jack 4 is connected with one ends of the two electromagnetic valves 11 through oil pipes, the other ends of the two electromagnetic valves 11 are connected with the oil pump 10, and the control ends of the two electromagnetic valves 11 are connected with the data processor 2 to control the oil amount entering the oil cylinder from the oil pump 10, so that the tensioning efficiency is improved.
The pressure sensor 7 is arranged at an oil inlet in the jack 4 and is far away from the oil pump 10 and the motor 9, electromagnetic interference caused by the work of the motor 9 is avoided, the accuracy of data acquisition of the pressure sensor 7 is ensured, the tensioning precision of prestress is improved, and the pressure sensor 7 is a resistance strain gauge with high precision and high stability.
In one embodiment, the pressure sensor 7 is arranged at an oil outlet in the jack 4, is far away from the oil pump 10 and the motor 9, avoids electromagnetic interference generated by the operation of the motor 9, ensures the accuracy of data acquisition of the pressure sensor 7, and improves the tensioning precision of prestress, and the pressure sensor 7 is a resistance strain gauge with high precision and high stability.
In one embodiment, pressure sensors 7 are arranged at an oil inlet and an oil outlet in the jack 4, and the pressure sensors 7 are resistance strain gauges with high precision and high stability, so that the tensioning control precision is improved.
In one embodiment, the pre-stressed tensioning device 25 further comprises an anti-arching displacement sensor, which is connected to the data processor 2 and is connected to the member to be tensioned for detecting an anti-arching value of the member to be tensioned.
The main controller 1 is connected with a mobile phone terminal or a remote computer through a wireless network, so that an operator can conveniently set prestress tension control through the mobile phone terminal or the remote computer, and look up the data change condition in the tension process in real time to realize remote monitoring operation.
In this embodiment, the wireless multipoint prestress collaborative tensioning control system provided by the invention can be specifically applied to a project of a suwan bridge, and has the advantages of full-automatic control of a computer, high control precision in a tensioning process, multipoint collaborative tensioning, synchronous correction of tensioning, real-time data monitoring feedback and high tensioning efficiency.
Example 2
Based on the above embodiment 1, as shown in fig. 5, a wireless multipoint prestress collaborative tensioning control method includes the following steps:
s1, starting the main controller 1 and the prestress tensioning equipment 25, inputting and storing working parameters into the main controller 1, wherein the working parameters comprise tensioning parameters, a tensioning stress limit value, a tensioning elongation limit value and a tensioning stress control value.
S2, the main controller 1 sends a tensioning instruction and working parameters to each secondary controller 15, the secondary controller 15 receives the instruction and stores the working parameters, the secondary controller 15 sends the instruction, the driving device is started, and the jack 4 is driven to tension the member to be tensioned;
the method for tensioning the member to be tensioned by driving the jack 4 comprises the following steps:
s211, firstly, carrying out initial stress tensioning, wherein the initial stress is 10% of the tensioning stress;
s212, tensioning the medium stress, wherein the medium stress is 30% of the tensioning stress;
and S213, tensioning the final stress, wherein the final stress is 100% of the tensioning stress, and the load is maintained for 2 min.
S3, the data processor 2 collects data obtained by the displacement sensor 5 and the pressure sensor 7, the data are converted through a preset formula to obtain stretching elongation and stretching stress, the converted data are transmitted to the secondary controller 15, and the secondary controller 15 analyzes and processes the data and sends the data to the main controller 1.
S4, the main controller 1 judges whether the tensile stress of each prestressed tensioning equipment 25 in the step S3 reaches the tensile stress control value set in the step S1, if so, the next step is continued, and if not, the next step is continued to the step S2 and the driving device is controlled to pressurize;
if the tensile stress exceeds the tensile stress limit value of the step S1 or the tensile elongation exceeds the tensile elongation limit value, a fault alarm is given, and the tensioning is stopped;
if the difference exists between the tension stresses of the pre-stressed tension devices 25 and is more than 2%, executing a correction command; the main controller 1 sends a correction instruction to the prestress tensioning equipment 25, executes a pause acceleration instruction for the prestress tensioning equipment 25 with large tensioning stress, and executes a continuous acceleration instruction for the prestress tensioning equipment 25 with small tensioning stress, thereby correcting the difference.
S5, the main controller 1 records the stretching elongation and the stretching stress of each pre-stressed stretching device 25 at this time, and sends a closing signal to each sub controller 15 to stop the stretching operation.
Example 3
In this embodiment, the wireless multipoint prestress collaborative tensioning control system and the control method thereof according to the present invention can be specifically applied to the project of the suwan bridge, and include the following steps:
firstly, the main controller 1 and the prestress tensioning equipment 25 are started, working parameters are input into the main controller 1 and stored, and the working parameters comprise tensioning parameters, a tensioning stress limit value, a tensioning elongation limit value and a tensioning stress control value.
Then the main controller 1 sends a tensioning instruction and working parameters to each secondary controller 15, the secondary controllers 15 receive the instruction and store the working parameters, the secondary controllers 15 send the instruction, a driving device is started, and the jacks 4 are driven to tension the members to be tensioned; the method for tensioning the member to be tensioned by driving the jack 4 comprises the following steps: firstly, carrying out initial stress tensioning, wherein the initial stress is 10% of the tensioning stress; then carrying out intermediate stress tensioning, wherein the intermediate stress is 30% of the tensioning stress; and then, tensioning with final stress, wherein the final stress is 100% of the tensioning stress, and the load is maintained for 2 min.
And then the data processor 2 acquires the data obtained by the displacement sensor 5 and the pressure sensor 7, converts the data into tensile elongation and tensile stress through a preset formula, transmits the converted data to the secondary controller 15, and the secondary controller 15 analyzes and processes the data and sends the data to the main controller 1.
Secondly, the main controller 1 judges whether the tension stress of each pre-stress tension device 25 in the previous step reaches the tension stress control value set in the first step, if so, the next step is continued, and if not, the next step is carried out and the driving device is controlled to pressurize; if the tensile stress exceeds the tensile stress limit value of the first step or the tensile elongation exceeds the tensile elongation limit value, a fault alarm is given, and the tensioning is stopped; if the difference exists between the tension stresses of the pre-stressed tension devices 25 and is more than 2%, executing a correction command; the main controller 1 sends a correction instruction to the prestress tensioning equipment 25, executes a pause acceleration instruction for the prestress tensioning equipment 25 with large tensioning stress, and executes a continuous acceleration instruction for the prestress tensioning equipment 25 with small tensioning stress, thereby correcting the difference.
Finally, the main controller 1 records the stretching elongation and the stretching stress of each pre-stress stretching device 25 at the moment, and simultaneously sends a closing signal to each secondary controller 15 to stop the stretching operation.
The wireless multi-point prestress collaborative tensioning control method can realize automatic control of the tensioning process and improve the tensioning control precision.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications, variations and combinations will be apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A wireless multipoint prestress collaborative tensioning control system is characterized by comprising a main controller (1) and two or more prestress tensioning devices (25), wherein the main controller (1) is connected with the prestress tensioning devices (25);
the prestress tensioning equipment (25) comprises a jack (4), a driving device, a displacement sensor (5), a pressure sensor (7), a data processor (2), a secondary controller (15) and a power switch (3); the secondary controller (15) is connected with the data processor (2), the data processor (2) is connected with the driving device, the driving device is connected with the jack (4), and the power switch (3) is respectively connected with the secondary controller (15) and the driving device.
2. A wireless multipoint prestress collaborative tensioning control system according to claim 1, wherein one end of the jack (4) is connected with a limiting plate (6) and is connected with a prestress rib matched with a member to be tensioned, the other end of the jack is connected with a tool anchor (8), the limiting plate (6) is connected with the displacement sensor (5), the jack (4) is connected with the pressure sensor (7), and the data processor (2) is respectively connected with the displacement sensor (5) and the pressure sensor (7).
3. The system for controlling the multipoint prestress collaborative tensioning according to claim 1, wherein the main controller (1) comprises a central processing module (16), a wireless communication module (18), a display module (19), a storage module (20), a touch operation module (17) and an alarm module (21), and the central processing module (16) is respectively connected with the wireless communication module (18), the display module (19), the storage module (20), the touch operation module (17) and the alarm module (21).
4. A wireless multipoint prestress collaborative tensioning control system according to any one of claims 1-3, characterized in that a printing interface (13) and a USB interface (14) are arranged on the main controller (1).
5. A wireless multipoint prestress collaborative tensioning control system according to any one of claims 1-3, wherein the driving device comprises an electromagnetic valve (11), an oil pump (10) and a motor (9), the oil pump (10) is connected with the jack (4) through an oil pipe, the oil pipe is provided with the electromagnetic valve (11), the electromagnetic valve (11) is connected with the data processor (2), the oil pump (10) is connected with the motor (9), and the oil pump (10) is provided with a pressure gauge (12).
6. A wireless multipoint prestress collaborative tensioning control system according to any one of claims 1-3, wherein the pressure sensor (7) is arranged at an oil inlet or an oil outlet in the jack (4), and the pressure sensor (7) is a resistance strain gauge with high precision and high stability.
7. The wireless multipoint prestress collaborative tensioning control system according to any one of claims 1 to 3, wherein the main controller (1) is connected with a mobile phone terminal or a remote computer through a wireless network.
8. The wireless multipoint prestress collaborative tensioning control system according to any one of claims 1 to 3, wherein the secondary controller (15) comprises a wireless communication interface (24), a display screen (23), a control chip (22) and an alarm (26), the control chip (22) is respectively connected with the wireless communication interface (24), the display screen (23) and the alarm (26), and the secondary controller (15) performs data transmission with the main controller (1) through the wireless communication interface (24).
9. The system of claim 8, wherein the secondary controller (15) further comprises a data storage unit and a data detection unit, the data storage unit is used for storing the working parameters of the corresponding jack (4), the data detection unit is used for detecting the working parameters of the jack (4), the data storage unit is connected with the data detection unit, the data storage unit and the data detection unit are respectively connected with the control chip (22), and the data detection unit is connected with the alarm (26).
10. The wireless multipoint prestress collaborative tensioning control method of the wireless multipoint prestress collaborative tensioning control system according to any one of claims 1-9, characterized by comprising the following steps:
s1, starting the main controller (1) and the prestress tensioning equipment (25), inputting and storing working parameters into the main controller (1), wherein the working parameters comprise tensioning parameters, a tensioning stress limit value, a tensioning elongation limit value and a tensioning stress control value;
s2, the main controller (1) sends a tensioning instruction and working parameters to each secondary controller (15), the secondary controllers (15) receive the instruction and store the working parameters, the secondary controllers (15) send the instruction, the driving device is started, and the jack (4) is driven to tension the member to be tensioned;
s3, the data processor (2) collects data obtained by the displacement sensor (5) and the pressure sensor (7), the data are converted through a formula to obtain stretching elongation and stretching stress, the converted data are transmitted to the secondary controller (15), and the secondary controller (15) analyzes and processes the data and sends the data to the main controller (1);
s4, the main controller (1) judges whether the tensile stress of each prestressed tension device (25) in the step S3 reaches the tensile stress control value set in the step S1, if so, the next step is continued, and if not, the next step is continued to the step S2 and the driving device is controlled to pressurize;
if the tensile stress exceeds the tensile stress limit value of the step S1 or the tensile elongation exceeds the tensile elongation limit value, a fault alarm is given, and the tensioning is stopped;
if the difference exists between the tension stresses of the pre-stressed tension devices (25) and is more than 2%, executing a correction command;
s5, the main controller (1) records the stretching elongation and the stretching stress of each prestress stretching device (25) at the moment, and simultaneously sends a closing signal to each secondary controller (15) to stop the stretching operation.
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| CN202110893213.1A CN113589735A (en) | 2021-08-04 | 2021-08-04 | Wireless multi-point prestress collaborative tensioning control system |
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| CN101989092A (en) * | 2009-07-31 | 2011-03-23 | 中国建筑第八工程局有限公司 | Wireless control system and method for multipoint prestress synergic tensioning |
| CN104963514A (en) * | 2015-04-27 | 2015-10-07 | 同济大学 | Control system with a plurality of prestress intelligent tensioning devices |
| US20170284111A1 (en) * | 2015-07-29 | 2017-10-05 | Seoul National University R&Db Foundation | System for monitoring tension force of tendon in post-tensioning |
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