CN103526948B - The control method of intelligent tensioning system and intelligent tensioning system - Google Patents
The control method of intelligent tensioning system and intelligent tensioning system Download PDFInfo
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- CN103526948B CN103526948B CN201310504240.0A CN201310504240A CN103526948B CN 103526948 B CN103526948 B CN 103526948B CN 201310504240 A CN201310504240 A CN 201310504240A CN 103526948 B CN103526948 B CN 103526948B
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Abstract
A kind of control method of intelligent tensioning system and intelligent tensioning system.Being characterized in setting up loading velocity control unit, for detecting the pressure of oil-in, and the pretightning force of the inlet pressure real-time monitored and setting at different levels being compared; Set up prestressing tendon elongation control unit, for detect in real time presstressed reinforcing steel stretching process and after reaching setting stretching force at different levels setting the dwell time shift value; The stretch-draw different jack tensile elongation value comparison step in addition that one-level is later; The control signal of stretching process different phase condition is converted to electromagnetic valve action and frequency converter rotating speed control overflow; And according to the signal that pressure sensor, displacement transducer in stretching process constantly feed back, fuzzy conditioning is carried out to concerned control command.Its advantage improves DATA REASONING precision and efficiency of construction, and alleviate the labour intensity of constructor, reduce costs, improve efficiency, eliminate the potential safety hazard of constructor, whole stretching process can once complete.
Description
Technical field
The present invention relates to prestressed concrete engineering technical field of construction equipment, particularly a kind of control method of intelligent tensioning system and intelligent tensioning system.
Background technology
Pre-stress construction quality is the critical process and the most important condition that ensure structural safety and durability.Traditional prestress tensioning equipment and construction method all adopt manual operation, by the handwheel control valve adjustment also controlled pressure of manual operation oil pump, force value for manually to read from pressure meter, artificial use steel ruler or tape measure read the measurement of elongation of steel strand, such pressure error is large, and synchronization accuracy is low, the wide-span case beam particularly needing repeatedly to fall and rigid frame bridge, because each run all needs to reinstall jack and moveable anchor, labour intensity and potential safety hazard very big.Also there are some tensioning equipments automatically controlled to occur at present, but there is a lot of defect: 1, cannot realize single pump list top, can realize again many pump many tops scheme, range of application has considerable restraint; 2, data transmission is unstable, often meeting occurrence record shortage of data; 3, control system performance is unreliable, and tensioning system fault rate is high, occurs phenomenon out of control sometimes, causes the situation that stretching control force is excessive or too small; 4, control system Signal transmissions is discontinuous, " strike " phenomenon causing system to work; 5, automatic Tensioning can only be realized in single stroke, multiple stroke automatic pouring cannot be realized and open.
Summary of the invention
Object of the present invention is just to provide one accurately can control, measures and show steel strand tension ductility and stretching force and correlation values index, and can realize control method and the intelligent tensioning system of the intelligent tensioning system of multiple-pass automatic pouring Zhang Gongneng.
Solution of the present invention is such:
A kind of control method of intelligent tensioning system, Intelligent pumping station, intelligent jack and computer controlling center, three is organically combined by high-pressure oil pipe, data transmission cable and control element, carries out multistage stretch-draw and backhaul, and in multistage stretch-draw, every grade of stretch-draw comprises step:
(a), set up loading velocity control unit in computer controlling center, for detecting the pressure of oil-in, and the stretching force of the inlet pressure real-time monitored and setting at different levels is compared, when inlet pressure is less than setting pressure, export fuel supply signal, jack loads, until inlet pressure >=setting stretching force;
(b), set up prestressing tendon elongation control unit in computer controlling center, utilize the displacement transducer being arranged at jack detect in real time prestressing tendon stretching process and after reaching setting stretching force at different levels at the shift value of setting dwell time.
Technical scheme also comprises more specifically: also comprise step: after every grade of stretch-draw terminates, and preserves the displacement of every grade of stretch-draw, pressure data.
Further: in step (a) to the method that jack loads to be: when jack load is apart from control load≤5% at different levels, system reduces the frequency of frequency converter automatically, makes load accurately apply to put in place.
It is further: also to comprise pressure holding step: when load accurately applies to put in place, computer controlling center is held lotus pressurize mode to system employing and is carried out pressurize, after dwell time completes, computer controlling center control system gives jack fuel feeding automatically, until reach the pressurize of whole cable tensios control load and backhaul puts in place.
Further: when many pump many tops stretch-draw, the later stretch-draw of one-level also comprises step:
Different jack tension power checks step: monitored the load of each jack respectively by pressure sensor and be sent to computer controlling center, the load of computer center to often pair of jack compares, when when one of them jack reaches setting load, another does not reach, reach the electromagnetic valve stopping that the jack of setting load is corresponding, fuel cut-off, do not reach the electromagnetic valve continuation energising that the jack of setting load is corresponding, continue fuel feeding, until reach setting load, electromagnetic valve stops and starting pressurize.
Further: when many pump many tops stretch-draw, the later stretch-draw of one-level also comprises step:
Different jack tensile elongation value comparison step: stretch value when being stretched to each jack respectively by displacement transducer carries out Real-Time Monitoring and compares, set the little value of deviation setting of often pair of jack and large value, be most perfect condition when the little value of difference △ L< deviation setting of often pair of jack Extension Values of Prestress Reinforcements, solenoid valves, continues fuel feeding; When the large value of deviation setting little value≤△ L≤deviation setting, though be the most desirable non-enable state, electromagnetic valve continues energising, continues fuel feeding; When the large value of △ L> deviation setting, the electromagnetic valve power-off that the jack that stretch value is large is corresponding, fuel cut-off, the electromagnetic valve that the jack that stretch value is little is corresponding continues energising, continues fuel feeding, until the little value of △ L< deviation setting, get back to most perfect condition, the electromagnetic valve stopped is energized again, fuel feeding again, so until reach setting pressure at different levels.
Further: described backhaul comprises step:
The retraction value that displacement transducer detects is measured when (a), oil return;
Measure stretch value b (), backhaul put in place after and preserve form, curve;
(c), setting backhaul safe pressure setting value, when return pressure is lower than backhaul safe pressure setting value, then Controlling solenoid valve stops after backhaul puts in place; If backhaul puts in place, the instantaneous pressure of generation is higher than backhaul safe pressure setting value, forces Controlling solenoid valve to stop by pressure switch.
Further: described computer controlling center to the method that data process is: the control signal of stretching process different phase condition to be converted to electromagnetic valve action and frequency converter rotating speed control overflow; And according to the signal that pressure sensor, displacement transducer in stretching process constantly feed back, fuzzy conditioning is carried out to concerned control command, guarantee system automatically controls whole stretching process and accurately completes prestressed stretch-draw procedures by pre-programmed step.
A kind of application rights requires that described in 1, method carries out the intelligent tensioning system of stretch-draw, comprise Intelligent pumping station, intelligent jack and computer controlling center, three is organically combined by high-pressure oil pipe, data transmission cable and control element, described Intelligent pumping station comprises switch board, oil pump, control valve group, it is characterized in that: described Intelligent pumping station
Be provided with frequency converter, the instruction that described frequency converter sends according to control centre carries out speed governing by changing frequency to motor;
At output pressure hydraulic fluid port, pressure sensor is housed, force value is sent to control centre, oil return opening is equipped with pressure switch, when return pressure reaches setting, the signal of telecommunication is sent to control centre;
Described control centre comprises:
Data input cell: for inputting the stretch-draw parameter of setting;
Data acquisition unit: for gather comprise pressure sensor force value, the first displacement transducer and the shift value of second displacement sensor, the signal of telecommunication of pressure switch;
Automatic controlled loading speed control unit: according to the force value of the pressure sensor collected, the first displacement transducer and the shift value of second displacement sensor, the signal of telecommunication of pressure switch, send instruction to frequency converter and speed governing is carried out to motor; When jack carries out stretch-draw, receive the shift value of the force value of pressure sensor, the first displacement transducer and second displacement sensor, export the signal that solenoid operated directional valve is controlled, until reach the stretching force of design; Jack backhaul on earth time, receive the setting signal of pressure switch, export the signal that solenoid operated directional valve is controlled, cut off the circuit of solenoid operated directional valve, stop to jack fuel feeding.
Technical scheme also comprises more specifically: described intelligent tensioning jack is connected with displacement transducer, institute's displacement sensors is fixed with magnet base, intelligent tensioning jack outer wall is fixed on by magnetic force, the outer face that described intelligent jack piston stretches out is fixed with spacing back-up ring, and the movable gauge head of institute's displacement sensors is connected with the spacing back-up ring of described end face by shift fork; Institute's displacement sensors connects the input of the data collecting instrument controlled by described control centre.
Further: described intelligent tensioning jack front end is provided with automated tool anchor slab, automated tool anchor slab front end is provided with guide peg, described guide peg and movable panel connect into slide construction, spring mechanism is provided with, for pushing movable panel automated backhaul between described guide peg and movable panel.
Advantage of the present invention is:
1, displacement transducer for measuring piston displacement is set on the oil cylinder of jack and measures the pressure sensor of cylinder cavity pressure, can automatically measure and control elongation and the tensile load of the prestressing tendon of each stretch-draw, the respective data transfer of collection shows after calculating to control centre by each sensor on a display screen, can effectively improve DATA REASONING precision and efficiency of construction, alleviate the labour intensity of constructor, reduce costs.
2, do not need close-in measurement and observation, improve the safety of construction, and constructing operation is convenient.
3, can control easily and observe tentioning stroke, thus in construction the development length of controlled pressure value and prestressing tendon exactly as requested, ensure that stretching force.
4, when long prestressing tendon stretching construction, jack and moveable anchor can put in place by automated backhaul under the elastic force effect of back-moving spring, and without the need to manually reinstalling, improve efficiency, eliminate the potential safety hazard of constructor.
5, displacement transducer is fixed on the outside of jack cylinder by the magneticaction of magnet base, can be convenient to dismounting.
6, wireless transmission unit is blue-tooth device, and signal is strong, good stability, and do not disturb by other wireless signals extraneous, maximum transmission distance reaches 800 meters.
7, oil return opening is provided with pressure switch, plays safeguard protection effect when backhaul.
8, whole stretching process can once complete.
Accompanying drawing explanation
Accompanying drawing is embodiments of the invention.
Fig. 1 is intelligent tensioning system list pump list top of the present invention scenario-frame schematic diagram.
Fig. 2 is that two pumps two of the many pumps of intelligent tensioning system of the present invention many tops scheme push up combining structure schematic diagram.
Fig. 3 is that two pumps four of the many pumps of intelligent tensioning system of the present invention many tops scheme push up combining structure schematic diagram.
Fig. 4 is the present invention's intelligence jack structure schematic diagram.
Fig. 5 is Intelligent pumping station structural representation of the present invention.
Fig. 6 is Intelligent pumping station valve body structure schematic diagram of the present invention.
Fig. 7 is Intelligent pumping station hydraulic schematic diagram of the present invention (pump one pushes up).
Fig. 8 is Intelligent pumping station hydraulic schematic diagram of the present invention (pump two pushes up).
Fig. 9 is intelligent tensioning system list pump list top of the present invention scheme control program flow chart.
Figure 10 is that two pumps two of the many pumps of intelligent tensioning system of the present invention many tops scheme push up combination control program from one-level stretch-draw to the flow chart of secondary stretch-draw ending phase.
Figure 11 is that two pumps two of the many pumps of intelligent tensioning system of the present invention many tops scheme push up combination control program from whole stretch-draw to the flow chart of stretch-draw ending phase.
Figure 12 is that two pumps four of the many pumps of intelligent tensioning system of the present invention many tops scheme push up combination control program flow chart one.
Figure 13 is that two pumps four of the many pumps of intelligent tensioning system of the present invention many tops scheme push up combination control program flowchart 2.
Figure 14 is that many pump many tops scheme force value is checked and stretch value compares flow chart.
In figure: 1, main pumping station, 2, main control cabinet, 3, Bluetooth antenna, 4, oil pipe, 5, data wire, 6, first moveable anchor, 17, second moveable anchor, 7, first displacement transducer, 16, second displacement sensor 8, first intelligent jack, 15, second intelligent jack, 9, first limiting plate, 14, second limiting plate, 10, first work anchor slab, 13 second work anchor slabs, 11, steel strand, 12, prestressed girder, 18, sub-control cabinet, 19, auxiliary pump station, 20, continuous steel frame case beam, 21, setscrew nut, 22, inlet nozzle, 23, magnet base switch, 24, magnet base, 25, punching cover, 26, piston, 27, oil cylinder, 28, oil return nozzle, 29, shift fork, 30, spacing back-up ring, 31, automated tool anchor slab, 32, tool clamping piece, 33, dynamic top board, 34, back-moving spring, 35, guide peg, 36, the fuel tank pump housing, 37, pressure sensor, 38, safety valve, 39, solenoid operated directional valve, 40, pressure meter tube connector, 41 oil-feed tables, 42, oil return table, 43, motor, 44, switch board, 45, electrical socket, 46, body frame structure for automotive, 47, oil filler, 48, oil return table interface, 49, oil return pipe interface, 50, pressure switch, 51, oil inlet pipe interface, 52, left control valve group, 53, right control valve group.
Detailed description of the invention
Of the present invention:
A kind of control method of intelligent tensioning system, Intelligent pumping station, intelligent jack and computer controlling center, three is organically combined by high-pressure oil pipe, data transmission cable and control element, carries out multistage stretch-draw and backhaul, and in multistage stretch-draw, every grade of stretch-draw comprises step:
(a), set up loading velocity control unit in computer controlling center, for detecting the pressure of oil-in, and the stretching force of the inlet pressure real-time monitored and setting at different levels is compared, when inlet pressure is less than setting pressure, export fuel supply signal, jack loads, until inlet pressure >=setting stretching force;
(b), set up prestressing tendon elongation control unit in computer controlling center, utilize the displacement transducer being arranged at jack detect in real time prestressing tendon stretching process and after reaching setting stretching force at different levels at the shift value of setting dwell time.
After every grade of stretch-draw terminates, the displacement of every grade of stretch-draw, pressure data are preserved.
In step (a) to the method that jack loads be: when jack load is apart from control load 5% at different levels, system reduces the frequency of frequency converter automatically, makes load accurately apply to put in place.
Pressure holding step is: when load accurately applies to put in place, computer controlling center is held lotus pressurize mode to system employing and is carried out pressurize, after dwell time completes, computer controlling center control system gives jack fuel feeding automatically, until reach the pressurize of whole cable tensios control load and backhaul puts in place.
When many pump many tops stretch-draw, the later stretch-draw of one-level also comprises step:
(1) different jack tension power checks step: monitored the load of each jack respectively by pressure sensor and be sent to computer controlling center, the load of computer center to often pair of jack compares, when when one of them jack reaches setting load, another does not reach, reach the electromagnetic valve stopping that the jack of setting load is corresponding, fuel cut-off, do not reach the electromagnetic valve continuation energising that the jack of setting load is corresponding, continue fuel feeding, until reach setting load, electromagnetic valve stops and starting pressurize.
(2) different jack tensile elongation value comparison step: stretch value when being stretched to each jack respectively by displacement transducer carries out Real-Time Monitoring and compares, set the little value of deviation setting of often pair of jack and large value, be most perfect condition when the little value of difference △ L< deviation setting of often pair of jack Extension Values of Prestress Reinforcements, solenoid valves, continues fuel feeding; When the large value of deviation setting little value≤△ L≤deviation setting, though be the most desirable non-enable state, electromagnetic valve continues energising, continues fuel feeding; When the large value of △ L> deviation setting, the electromagnetic valve power-off that the jack that stretch value is large is corresponding, fuel cut-off, the electromagnetic valve that the jack that stretch value is little is corresponding continues energising, continues fuel feeding, until the little value of △ L< deviation setting, get back to most perfect condition, the electromagnetic valve stopped is energized again, fuel feeding again, so until reach setting pressure at different levels.
Described backhaul comprises step:
The retraction value that displacement transducer detects is measured when (a), oil return;
Do not measure stretch value b (), backhaul put in place after and preserve form, curve;
(c), setting backhaul safe pressure setting value, when return pressure is lower than backhaul safe pressure setting value, then Controlling solenoid valve stops after backhaul puts in place; If backhaul puts in place, the instantaneous pressure of generation is higher than backhaul safe pressure setting value, forces Controlling solenoid valve to stop by pressure switch.
Described computer controlling center to the method that data process is: the control signal of stretching process different phase condition is converted to electromagnetic valve action and frequency converter rotating speed control overflow; And according to the signal that pressure sensor, displacement transducer in stretching process constantly feed back, fuzzy conditioning is carried out to concerned control command, guarantee system automatically controls whole stretching process and accurately completes prestressed stretch-draw procedures by pre-programmed step.
A kind of application rights requires that described in 1, method carries out the intelligent tensioning system of stretch-draw, comprise Intelligent pumping station, intelligent jack and computer controlling center, three is organically combined by high-pressure oil pipe, data transmission cable and control element, described Intelligent pumping station comprises switch board, oil pump, control valve group, it is characterized in that: described Intelligent pumping station
Be provided with frequency converter, the instruction that described frequency converter sends according to control centre carries out speed governing by changing frequency to motor 43;
At output pressure hydraulic fluid port, pressure sensor 37 is housed, force value is sent to control centre, oil return opening is equipped with pressure switch 50, when return pressure reaches setting, the signal of telecommunication is sent to control centre;
Described control centre comprises:
Data input cell: for inputting the stretch-draw parameter of setting;
Data acquisition unit: for gather comprise pressure sensor 37 force value, the first displacement transducer 7 and the shift value of second displacement sensor 16, the signal of telecommunication of pressure switch 50;
Automatic controlled loading speed control unit: according to shift value, pressure switch 50 force value of pressure sensor 37, first displacement transducer 7 collected and second displacement sensor 16, send instruction to frequency converter and speed governing is carried out to motor 43; When jack carries out stretch-draw, receive the shift value of the force value of pressure sensor 37, the first displacement transducer 7 and second displacement sensor 16, export the signal that solenoid operated directional valve 39 is controlled, until reach the stretching force of design; Jack backhaul on earth time, receive the setting signal of pressure switch 50, export the signal that solenoid operated directional valve 39 is controlled, cut off the circuit of solenoid operated directional valve 39, stop to jack fuel feeding.
Described intelligent tensioning jack is connected with displacement transducer, institute's displacement sensors is fixed with magnet base, intelligent tensioning jack outer wall is fixed on by magnetic force, the outer face that described intelligent jack piston stretches out is fixed with spacing back-up ring, and the movable gauge head of institute's displacement sensors is connected with the spacing back-up ring of described end face by shift fork; Institute's displacement sensors connects the input of the data collecting instrument controlled by described control centre.
Described intelligent tensioning jack front end is provided with automated tool anchor slab, automated tool anchor slab front end is provided with guide peg, described guide peg and movable panel 33 connect into slide construction, between described guide peg and movable panel, be provided with spring mechanism, for pushing movable panel automated backhaul.
Based on technique scheme, the present invention has following embodiment:
Embodiment 1:
As Fig. 1, 4, 5, 6, 7, shown in 9, for the embodiment on single pump list top, intelligent tensioning system mainly comprises ground tackle 10, first limiting plate 9, first moveable anchor 6, first intelligent jack 8, main pumping station 1, main pumping station 1 is connected with the be arranged at prestressing tendon first intelligent jack 8 by multiple-tubing string 4, main pumping station 1 has switch board, the data collecting instrument controlled by control system is provided with in switch board, the arranged outside of the first intelligent jack 8 has the first displacement transducer 7 measuring jack piston rod extension elongation, the oil-feed oil circuit of the first intelligent jack 8 is also provided with the pressure sensor 37 measuring jack pressure value, first displacement transducer 7 and the pressure sensor 37 of the control system of main pumping station 1 and first of prestressing tendon the intelligent jack 8 are electrically connected, the data wire 5 of the first displacement transducer 7 accesses corresponding data collecting instrument input, main control cabinet 2 is provided with the frequency converter controlled by control system and the wireless transmission unit of carrying out data transmission, the panel of switch board is provided with online button and stretch-draw start button.
When prestressing tendon stretching construction, first steel strand 11 in the reserving hole channel of prestressed girder 12, first work anchor slab 10 is installed, second work anchor slab 13 and the first limiting plate 9, again the first intelligent jack 8 is arranged on the outside of limiting plate, load onto the first moveable anchor 6, with multiple-tubing string 4 entering main pumping station 1, oil return interface is the entering of intelligent jack 8 with first respectively, oil return nozzle correspondence connects, and connect data wire 5, the guidance panel of switch board starts pumping plant respectively, press stretch-draw start button, main pumping station 1 is under control of the control system to the first intelligent jack 8 fuel feeding, the piston of jack drives the first moveable anchor 6 outwards to move while overhanging, reach object steel strand 11 being loaded to stretch-draw.Along with the increase of piston displacement, the force value of the first intelligent jack 8 inner chamber also will strengthen, the mobile shift fork being installed on the first displacement transducer 7 outside jack can be overhanging along with jack piston, the displacement readings of the first displacement transducer 7 also will produce respective change, now control system carries out data acquisition by corresponding analogue collection module to the first displacement transducer 7 and pressure sensor 37, control centre automatically analyses and compares to this item number certificate and calculates, when jack load is apart from control load≤5% at different levels, system reduces the frequency of frequency converter automatically, load is made accurately to apply to put in place, now system carries out holding lotus pressurize automatically, after dwell time completes, system gives jack fuel feeding automatically, until reach the pressurize of whole cable tensios control load and backhaul puts in place.
See Fig. 9, the present embodiment stretching process is one-level stretch-draw, secondary stretch-draw, whole level stretch-draw and backhaul, wherein stretch-draw at different levels is by the pressure detecting oil-in in computer controlling center, and the pretightning force of the inlet pressure real-time monitored and setting at different levels is compared, when inlet pressure is less than setting pressure, export fuel supply signal, jack loads, until inlet pressure >=setting pretightning force;
Set up prestressing tendon elongation control unit in computer controlling center, utilize the displacement transducer being arranged at jack detect in real time prestressing tendon stretching process and after reaching setting stretching force at different levels at the shift value of setting dwell time.
To the method that jack loads be: when jack load is apart from control load 5% at different levels, system reduces the frequency of frequency converter automatically, makes load accurately apply to put in place.
When load accurately applies to put in place, computer controlling center adopts system and holds lotus pressurize mode and carry out pressurize, and after the dwell time completes, computer controlling center control system gives jack fuel feeding automatically, until reach the pressurize of whole cable tensios control load and backhaul puts in place.
Described computer controlling center to the method that data process is: the control signal of stretching process different phase condition is converted to electromagnetic valve action and frequency converter rotating speed control overflow; And according to the signal that pressure sensor, displacement transducer in stretching process constantly feed back, fuzzy conditioning is carried out to concerned control command, guarantee system automatically controls whole stretching process and accurately completes prestressed stretch-draw procedures by pre-programmed step.
After every grade of stretch-draw terminates, the displacement of every grade of stretch-draw, pressure data are preserved.
Embodiment 2:
As Fig. 2, 8, 10, shown in 11, intelligent tensioning system mainly comprises the first work anchor slab 10, second work anchor slab 13, first limiting plate 9, second limiting plate 14, first moveable anchor 6, second moveable anchor 17, first intelligent jack 8, second intelligent jack 15, main pumping station 1 and auxiliary pump station 19, main pumping station 1 and auxiliary pump station 19 are respectively by multiple-tubing string 4 and the first intelligent jack 8 being arranged at prestressing tendon two ends, second intelligent jack 15 is connected, main pumping station 1 and auxiliary pump station 19 all have switch board, the data collecting instrument controlled by control system is provided with in switch board, first intelligent jack 8, the outside of the second intelligent jack 15 is respectively arranged with the first displacement transducer 7 measuring jack piston rod extension elongation, second displacement sensor 16, at the first intelligent jack 8, the oil-feed oil circuit of the second intelligent jack 15 is also provided with the pressure sensor 37 measuring jack pressure value, first displacement transducer 7 and the pressure sensor 37 of the control system of main pumping station 1 and first of prestressing tendon one end the intelligent jack 8 are electrically connected, second displacement sensor 16 and the pressure sensor 37 of the control system at auxiliary pump station 19 and second of the prestressing tendon other end the intelligent jack 15 are electrically connected, first displacement transducer 7, second displacement sensor 16 accesses corresponding analogue collection module respectively by two data lines 5, the frequency converter controlled by control system and the wireless transmission unit of carrying out data transmission is provided with in main control cabinet 2 and sub-control cabinet 18, the wireless transmission unit that this example implements to adopt is blue-tooth device, for guaranteeing communication efficiency, in the outside of main control cabinet 2 and sub-control cabinet 18, the Bluetooth antenna 3 realizing data transmission is all installed, the panel of each switch board is all provided with online button and stretch-draw start button.
When prestressing tendon stretching construction, first steel strand 11 in the reserving hole channel of prestressed girder 12, first instrument anchor slab 10 is installed, second instrument anchor slab 13 and the first limiting plate 9, second limiting plate 14, again by the first intelligent jack 8, second intelligent jack 15 is arranged on the outside of corresponding limiting plate respectively, load onto the first moveable anchor 6, second moveable anchor 17, with multiple-tubing string 4 entering main pumping station 1 and auxiliary pump station 19, oil return interface is the intelligent jack 8 with first respectively, entering of second intelligent jack 15, oil return nozzle connects one to one, and connect data wire 5, the guidance panel of switch board starts main pumping station 1 and auxiliary pump station 19 respectively, button on panel is chosen as online, press stretch-draw start button, the control system of main pumping station 1 and the control system at auxiliary pump station 19 realize data by Bluetooth antenna 3 and transmit, main pumping station 1 and auxiliary pump station 19 namely interlock control system control under respectively to the first intelligent jack 8, second intelligent jack 15 fuel feeding, the piston of jack drives the first moveable anchor 6 respectively while overhanging, second moveable anchor 17 outwards moves, reach object steel strand 11 being loaded to stretch-draw.Along with the increase of piston displacement, first intelligent jack 8, the force value of the second intelligent jack 15 inner chamber also will strengthen, be installed on the first displacement transducer 7 outside jack, the mobile shift fork of second displacement sensor 16 can be overhanging along with jack piston, first displacement transducer 7, the displacement readings of second displacement sensor 16 also will produce respective change, the control system now linked by corresponding analog module to the first displacement transducer 7, second displacement sensor 16 and pressure sensor 37 carry out data acquisition, and to this item number according to automatically analysing and comparing and calculating, when jack load is apart from control load≤5% at different levels, system reduces the frequency of frequency converter automatically, load is made accurately to apply to put in place, now system carries out holding lotus pressurize automatically, after dwell time completes, system gives jack fuel feeding automatically, until reach the pressurize of whole cable tensios control load and backhaul puts in place.
When adopting the scheme on the many tops of many pumps, main pumping station 1 and auxiliary pump station 19 according to the needs of engineering reality, can connect with the intelligent jack being arranged at a branch of prestressing tendon two ends, as shown in Figure 2; Or connect with the intelligent jack being arranged at two bundle prestressing tendon two ends.
See Figure 10, 11, Figure 14, in the control method of the present embodiment and embodiment 1, in secondary stretch-draw and whole level stretch-draw, add different jack tension power checks rapid: can't help pressure sensor respectively to the first intelligent jack 8, the load of the second intelligent jack 15 carries out monitoring and being sent to computer controlling center, computer center is to the first intelligent jack 8, the load of the second intelligent jack 15 compares, when when the first intelligent jack 8 reaches setting load, the second intelligent jack 15 does not reach, the electromagnetic valve of the first intelligent jack 8 correspondence stops, fuel cut-off, the electromagnetic valve of the second intelligent jack 15 correspondence continues energising, continue fuel feeding, until reach setting load, electromagnetic valve stops and starting pressurize.Otherwise, second intelligent jack 15 reaches setting load and the first intelligent jack 8 when not reaching, the electromagnetic valve of the second intelligent jack 15 correspondence stops, fuel cut-off, the electromagnetic valve of the first intelligent jack 8 correspondence continues energising, continue fuel feeding, until reach setting load, electromagnetic valve stops and starting pressurize.
See Figure 10, 11, Figure 14, in the control method of the present embodiment and embodiment 1, different jack tensile elongation value comparison step is added: by the first displacement transducer 7 in secondary stretch-draw and whole level stretch-draw, second displacement sensor 16 is respectively to the first intelligent jack 8, stretch value when second intelligent jack 15 stretches carries out Real-Time Monitoring and compares, set the little value of deviation setting of piston stretch value when the first intelligent jack 8 and the second intelligent jack 15 stretch and large value, be most perfect condition when the little value of difference △ L< deviation setting of stretch value, solenoid valves, continue fuel feeding, when the large value of deviation setting little value≤△ L≤deviation setting, though be the most desirable non-enable state, electromagnetic valve continues energising, continue fuel feeding, when the large value of △ L> deviation setting, as the piston stretch value of the intelligent jack 15 of piston stretch value > second of the first intelligent jack 8, the electromagnetic valve power-off of the first intelligent jack 8 correspondence, fuel cut-off, the electromagnetic valve of the second intelligent jack 15 correspondence continues energising, continues fuel feeding, until the little value of △ L< deviation setting, get back to most perfect condition, the electromagnetic valve of the first intelligent jack 8 correspondence is energized again, again fuel feeding.Otherwise, as the piston stretch value of the intelligent jack 15 of piston stretch value < second of the first intelligent jack 8, the electromagnetic valve power-off of the second intelligent jack 15 correspondence, fuel cut-off, the electromagnetic valve of the first intelligent jack 8 correspondence continues energising, continues fuel feeding, until the little value of △ L< deviation setting, get back to most perfect condition, the electromagnetic valve of the second intelligent jack 15 correspondence is energized again, again fuel feeding.So until reach setting pressure at different levels.
Embodiment 3:
As Fig. 3, 12, 13, shown in 14, namely each pumping plant connects one or two intelligent jack respectively, thus realizes symmetrical to a branch of or two bundle steel strand simultaneously, synchronous tension, to improve engineering construction quality and operating efficiency, in structure shown in Fig. 3, carries out stretch-draw at continuous steel-structure box girder 20 four intelligent jack, wherein No. 1, No. 3 a branch of presstressed reinforcing steels of intelligent tensioning jack pair carry out stretch-draw, No. 2, No. 4 another bundle presstressed reinforcing steels of intelligent tensioning jack pair carry out stretch-draw, No. 1, No. 2 intelligent tensioning jack are positioned at one end of continuous steel-structure box girder 20, No. 3, No. 4 intelligent tensioning jack are positioned at the other end of continuous steel-structure box girder 20, the different jack tension power increased in secondary stretch-draw and whole level stretch-draw check step: compare being positioned at continuous steel-structure box girder 20, that is: by No. 1 with a branch of intelligent tensioning jack tension force value, No. 3 intelligent tensioning jack tension force value compare, by No. 2, No. 4 intelligent tensioning jack tension force value compare.The different jack tensile elongation value comparison step increased in secondary stretch-draw and whole level stretch-draw are: compare being positioned at continuous steel-structure box girder 20 with a branch of intelligent tensioning jack tensile elongation value, that is: No. 1, No. 3 intelligent tensioning jack tensile elongation values are compared, No. 2, No. 4 intelligent tensioning jack tensile elongation values compared, all the other processing methods are consistent with embodiment 2.
In above-described embodiment, for the operating mode of long prestressing tendon, intelligent tensioning jack front end of the present invention is provided with automated tool anchor slab, automated tool anchor slab front end is provided with guide peg, described guide peg and movable panel 33 connect into slide construction, spring mechanism is provided with, for pushing movable panel automated backhaul between described guide peg and movable panel.
Such as: continuous rigid frame bridge and box girder bridge, need to carry out the stretch-draw repeatedly of multiple stroke, then the moveable anchor of intelligent jack is replaced by automated tool anchor, as shown in Figure 4.Jack mainly comprises oil cylinder 27, punching cover 25, piston 26, first displacement transducer 7, the tool clamping piece 32 that the outer end of piston 26 is equipped with the automated tool anchor slab 31 for clamping prestressing tendon and is contained in this automated tool anchor slab 31 taper hole, the periphery of automated tool anchor slab 31 is provided with positioning step, automated tool anchor slab 31 compresses this positioning step by the spacing back-up ring 30 of end face and is fixed on piston 26 outer end, the uniform multiple guide pegs 35 being fixed with the axis along piston 26 and arranging on automated tool anchor slab 31, described spring mechanism comprises back-moving spring 34, namely each guide peg 35 is all arranged with back-moving spring 34, the outer end of guide peg 35 is provided with the limited block for limiting back-moving spring 34, movable panel 33 is sheathed on multiple guide peg 35, movable panel 33 is placed between tool clamping piece 32 and back-moving spring 34, movable panel 33 offers the through hole installing prestressing tendon.
When prestressing tendon stretching construction, oil pump is from inlet nozzle 22 to jack fuel feeding, oil pressure makes piston 26 stretch out outside oil cylinder 27, the automated tool anchor slab 31 be arranged on piston 26 is driven while piston 26 movement, tool clamping piece 32 and the spacing back-up ring 30 of end face and shift fork 29 move thereupon, the displacement readings that shift fork 29 pulls the movable gauge head of the first displacement transducer 7 to make it produce produces corresponding change, and along with the increase of displacement, force value in working chamber also will increase, controller carries out data acquisition by analogue collection module to pressure sensor 37 and the first displacement transducer 7, after meeting the requirements of elongation and tensile load, stretch-draw work completes, unloaded operation oil pressure, fluid makes piston 26 reset from oil return nozzle 28 to oil cylinder 27 fuel feeding, under the effect of back-moving spring 34, tool clamping piece 32 puts in place with automated tool anchor slab 31 and piston 26 backhaul, for stretch-draw work is next time prepared.In the process of above-mentioned stretching construction, the change conditions of related data can be observed from display in real time.
Claims (7)
1. the control method of an intelligent tensioning system, Intelligent pumping station, intelligent jack and computer controlling center, three is organically combined by high-pressure oil pipe, data transmission cable and control element, carries out multistage stretch-draw and backhaul, and in multistage stretch-draw, every grade of stretch-draw comprises step:
(a), set up loading velocity control unit in computer controlling center, for detecting the pressure of oil-in, and the stretching force of the inlet pressure real-time monitored and setting at different levels is compared, when inlet pressure is less than setting stretching force, export fuel supply signal, jack loads, until inlet pressure >=setting stretching force;
(b), set up prestressing tendon elongation control unit in computer controlling center, utilize the displacement transducer being arranged at jack detect in real time prestressing tendon stretching process and after reaching setting stretching force at different levels at the shift value of setting dwell time, it is characterized in that: also comprise pressure holding step: when load accurately applies to put in place, computer controlling center is held lotus pressurize mode to system employing and is carried out pressurize, after dwell time completes, computer controlling center control system gives jack fuel feeding automatically, until reach the pressurize of whole cable tensios control load and backhaul puts in place.
2. the control method of intelligent tensioning system according to claim 1, is characterized in that: when many pump many tops stretch-draw, and the later stretch-draw of one-level also comprises step:
Different jack tensile elongation value comparison step: stretch value when being stretched to each jack respectively by displacement transducer carries out Real-Time Monitoring and compares, set the little value of deviation setting of often pair of jack and large value, be most perfect condition when the little value of difference △ L< deviation setting of often pair of jack Extension Values of Prestress Reinforcements, solenoid valves, continues fuel feeding; When the large value of deviation setting little value≤△ L≤deviation setting, though be the most desirable non-enable state, electromagnetic valve continues energising, continues fuel feeding; When the large value of △ L> deviation setting, the electromagnetic valve that the jack that stretch value is large is corresponding stops, fuel cut-off, the electromagnetic valve that the jack that stretch value is little is corresponding continues energising, continues fuel feeding, until the little value of △ L< deviation setting, get back to most perfect condition, the electromagnetic valve stopped is energized again, fuel feeding again, so until reach setting pressure at different levels.
3. the control method of intelligent tensioning system according to claim 1, is characterized in that: described backhaul comprises step:
The retraction value that displacement transducer detects is measured when (a), oil return;
Measure stretch value b (), backhaul put in place after and preserve form, curve;
(c), setting backhaul safe pressure setting value, when return pressure is lower than backhaul safe pressure setting value, then Controlling solenoid valve stops after backhaul puts in place; If backhaul puts in place, the instantaneous pressure of generation is higher than backhaul safe pressure setting value, forces Controlling solenoid valve to stop by pressure switch.
4. the control method of intelligent tensioning system according to claim 1, is characterized in that: described computer controlling center to the method that data process is: the control signal of stretching process different phase condition is converted to electromagnetic valve action and frequency converter rotating speed control overflow; And according to the signal that pressure sensor, displacement transducer in stretching process constantly feed back, fuzzy conditioning is carried out to concerned control command, guarantee system automatically controls whole stretching process and accurately completes prestressed stretch-draw procedures by pre-programmed step.
5. an application rights requires that described in 1, method carries out the intelligent tensioning system of stretch-draw, comprise Intelligent pumping station, intelligent jack and computer controlling center, three is organically combined by high-pressure oil pipe, data transmission cable and control element, described Intelligent pumping station comprises switch board, oil pump, control valve group, it is characterized in that: described Intelligent pumping station:
Be provided with frequency converter, the instruction that described frequency converter sends according to control centre carries out speed governing by changing frequency to motor (43);
At output pressure hydraulic fluid port, pressure sensor (37) is housed, force value is sent to control centre, oil return opening is equipped with pressure switch (50), when return pressure reaches setting, the signal of telecommunication is sent to control centre;
Described control centre comprises:
Data input cell: for inputting the stretch-draw parameter of setting;
Data acquisition unit: comprise the force value of pressure sensor (37), the first displacement transducer (7) and the shift value of second displacement sensor (16), the signal of telecommunication of pressure switch (50) for gathering;
Automatic controlled loading speed control unit: according to the force value of the pressure sensor collected (37), the first displacement transducer (7) and the shift value of second displacement sensor (16), the signal of telecommunication of pressure switch (50), send instruction to frequency converter and speed governing is carried out to motor (43); When jack carries out stretch-draw, receive the shift value of the force value of pressure sensor (37), the first displacement transducer (7) and second displacement sensor (16), export the signal that solenoid operated directional valve (39) is controlled, until reach the stretching force of design; Jack backhaul on earth time, receive pressure switch (50) setting signal, export the signal that solenoid operated directional valve (39) is controlled, cut off solenoid operated directional valve (39) circuit, stop to jack fuel feeding.
6. intelligent tensioning system according to claim 5, it is characterized in that: described intelligent tensioning jack is connected with displacement transducer, institute's displacement sensors is fixed with magnet base, intelligent tensioning jack outer wall is fixed on by magnetic force, the outer face that described intelligent jack piston stretches out is fixed with spacing back-up ring, and the movable gauge head of institute's displacement sensors is connected with the spacing back-up ring of described end face by shift fork; Institute's displacement sensors connects the input of the data collecting instrument controlled by described control centre.
7. intelligent tensioning system according to claim 6, it is characterized in that: described intelligent tensioning jack front end is provided with automated tool anchor slab, automated tool anchor slab front end is provided with guide peg, described guide peg and movable panel (33) connect into slide construction, spring mechanism is provided with, for pushing movable panel automated backhaul between described guide peg and movable panel.
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Address after: 545112 Sifang Industrial Zone, Xinxing Industrial Park, Liujiang County, Liuzhou City, Guangxi Zhuang Autonomous Region Patentee after: Liuzhou Qianqiao Technology Co.,Ltd. Address before: 545112 Sifang Industrial Zone, Xinxing Industrial Park, Liujiang County, Liuzhou City, Guangxi Zhuang Autonomous Region Patentee before: LIUZHOU QIAN BRIDGE ENGINEERING MATERIALS Co.,Ltd. |