CN102062620A - Automatic control test bed of prestressed anchorage system - Google Patents
Automatic control test bed of prestressed anchorage system Download PDFInfo
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- CN102062620A CN102062620A CN 201010568471 CN201010568471A CN102062620A CN 102062620 A CN102062620 A CN 102062620A CN 201010568471 CN201010568471 CN 201010568471 CN 201010568471 A CN201010568471 A CN 201010568471A CN 102062620 A CN102062620 A CN 102062620A
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Abstract
The invention discloses an automatic control test bed of a prestressed anchorage system. The test bed comprises a long rack, a jack, an oil pump station, a computer arranged on a console and a front box. The automatic control test bed is characterized in that: one end of a short rack is connected with the outer side of the lower right part of the long rack, and a press sensor is connected with the other end of the short rack; the pressure sensor is connected with a pressure digital display, and the pressure digital display is connected with the front box; a combination valve is arranged on the oil pump station, and the combination valve is provided with an electromagnetic valve, a proportional overflow valve and an oil pressure sensor connected with the front box; a main displacement sensor is arranged on the jack, and the main displacement sensor is connected with the front box; and a plurality of micro displacement sensors are arranged on the end face of the short rack and connected with the front box. The test bed can accurately complete static load experiment, repeated tension process experiment, synchronous clamping piece and stranded wire retraction experiment, anchorage device retraction experiment and full friction experiment. The test bed has high repetition precision and good reliability, greatly improves the experiment efficiency, and is convenient to implement comprehensive quality control on an anchorage device connector.
Description
Technical field
The present invention relates to the construction work experimental provision, be specifically related to prestress anchorage system and control testing table automatically.
Background technology
Prestress anchorage system is used very extensive in construction work.Generally steel strand wires, connector and ground tackle are called prestress anchorage system.The GB/T14370-2000 standard code must be tested before use to ground tackle and connector.At present, the amount of recovery of steel strand wires, ground tackle is by the hand dipping reading, the defective that has low precision, oil pressure pressure reading, pressure gauge reading can not be gathered simultaneously, and the installation in each test of existing testing table is too complicated, loaded down with trivial details, lacks the function that one-step installation is finished multiple test, therefore, ground tackle test can not reach re-set target, is difficult to realize the control to its quality, and present gantries is developed at above-mentioned deficiency just.
Summary of the invention
The purpose of this invention is to provide a kind of prestress anchorage system and control testing table automatically, it can be finished the static load experiment to prestressed anchor and connector, repeats the tensioning process experiment in one-step installation, intermediate plate and steel strand wires bounce back experiment synchronously, the experiment of ground tackle retraction and full frictional resistance test; Can also carry out the cyclic loading experiment separately, experimental result is accurate, repeatable accuracy height, good reliability.
Prestress anchorage system of the present invention is controlled testing table automatically, the oil pump station that comprise the long table frame, be connected the lifting jack of outside, bottom, long table frame left side, links to each other by high-pressure oil pipe and low pressure pipe with lifting jack, be located at the computing machine on control desk top, the front tank that is located at the control desk bottom and is connected with computing machine, front tank is connected with the 220V power supply by first power lead, oil pump station is connected with the 380V power supply by the second source line, it is characterized in that:
One end of one short stand is connected with the outside of long table frame lower right side, and a pressure transducer is connected with the other end of short stand; This pressure transducer is connected with the pressure digital display instrument by first lead, and this pressure digital display instrument is connected with front tank by second lead, and is connected with the 220V power supply by the 3rd power lead;
One combination valve is located on the oil pump station, is provided with the solenoid valve, proportional pressure control valve and the oil pressure sensor that link to each other with front tank on combination valve;
One status of a sovereign displacement sensor is located on the lifting jack, and this status of a sovereign displacement sensor is connected with front tank;
Many miniature displacement transducers are located on the magnetic force gauge stand of short stand end face by support bar, and are connected with front tank by many miniature displacement transducer signal lines.
Described prestress anchorage system is controlled testing table automatically, its described front tank is provided with the 220V power interface, the RS232 interface, status of a sovereign displacement sensor interface, solenoid valve interface, the proportional pressure control valve interface, the oil pressure sensor interface, 8 miniature displacement transducer interfaces, the 220V power interface on the front tank is connected with the 220V power supply, the RS232 interface is connected with the pressure digital display instrument by the RS232 signal wire, status of a sovereign displacement sensor interface is connected with status of a sovereign displacement sensor by status of a sovereign displacement sensor signal wire, solenoid valve interface is connected with solenoid valve by control line of electromagnetic valve, proportional pressure control valve interface passing ratio surplus valve control line is connected with proportional pressure control valve, the oil pressure sensor interface is connected with oil pressure sensor by the oil pressure sensor signal wire, 8 miniature displacement transducer interfaces are connected with 8 miniature displacement transducers by 8 miniature displacement transducer signal lines.
Described prestress anchorage system is controlled testing table automatically, and the status of a sovereign displacement sensor gauge head of its described status of a sovereign displacement sensor is connected with the circular big baffle plate of lifting jack by the circular small front apron that is installed on the lifting jack.
Described prestress anchorage system is controlled testing table automatically, is provided with control circuit in front tank, and this control circuit comprises single chip circuit, reference circuit, Acquisition Circuit, Proportion valve controlling circuit, reversal valve control circuit, communicating circuit and power circuit; Described single chip circuit comprises single-chip microcomputer U5, capacitor C 6, reset resistor R20 and by crystal oscillator Y1, the oscillatory circuit that capacitor C 14, C15 constitute; Capacitor C 6 is connected on 7 pin of single-chip microcomputer U5, is used to the power filter of single-chip microcomputer; The reset resistor R20 one termination power VCC other end connects 1 pin of single-chip microcomputer U5, provides reset signal for single-chip microcomputer when being used to power on; 9 pin, the other end of the crystal oscillator Y1 one termination single-chip microcomputer U5 of oscillatory circuit connects 10 pin of single-chip microcomputer U5, is used to single-chip microcomputer that frequency of operation is provided; The model of single-chip microcomputer U5 is ATMEGA8, and this single chip circuit is used to control total system.
Described prestress anchorage system is controlled testing table automatically, and its described reference circuit comprises first reference circuit and second reference circuit; First reference circuit comprises reference source U1, operational amplifier U3, resistance R 15, R2, R3, R17, R18, R19 and capacitor C 5; Power supply VCC connects the 2 pin ground connection, 3 pin of 1 pin of reference source U1 and 3 pin, reference source U1 3 pin by resistance R 2 concatenation operation amplifier U3 by resistance R 15; 2 pin of operational amplifier U3 meet reference voltage output end REF5V by resistance R 3 ground connection and by resistance R 17, R19,4 pin ground connection, and 8 pin were connected the 24V power supply of capacitor C 5 filtering, and 1 pin meets reference voltage output end REF5V by resistance R 18; Be used for providing the quantification benchmark to the Acquisition Circuit of back; Second reference circuit comprises reference source U2, resistance R 16; Power supply VCC meets reference voltage output end REF2.5 by 1 pin and 3 pin, the 2 pin ground connection of reference source U2,3 pin that resistance R 16 connects reference source U2; Be used for providing the quantification benchmark to the Proportion valve controlling circuit of back; The model of reference source U1, U2 is TL431, and the model of operational amplifier U3 is LM358.
Described prestress anchorage system is controlled testing table automatically, its described Acquisition Circuit comprises the connection terminal J2 of external pressure transducer, meet connection terminal J4, J5, J6, the J8 of 8 microsensors, meet the connection terminal J7 of status of a sovereign displacement sensor and oil pressure sensor, the RC filtering circuit that resistance R 1, R4, R5, R6, R7, R8, R9, R11, R12, R110, R13 and capacitor C 24, C23, C22, C21, C20, C19, C18, C17, C25, C26 constitute, acquisition chip U4; The simulating signal of sensor acquisition is imported acquisition chip U4 into by connection terminal after filtering, U4 is converted into digital signal and exports to single-chip microcomputer U5; 14 pin of acquisition chip U4 are connected with the reference voltage output end REF5V of first reference circuit, and the 15-18 pin is connected with the 16-19 pin of single-chip microcomputer U5 respectively; The model of acquisition chip U4 is TLC2543.
Described prestress anchorage system is controlled testing table automatically, and its described Proportion valve controlling circuit comprises DA chip U7, connection terminal J9, resistance R 22, capacitor C 11; Reference voltage output end REF2.5,8 pin that the 1-3 pin of DA chip U7 is connected with the 4-6 pin of single-chip microcomputer U5,5 pin ground connection, 6 pin connect second reference source connect power supply VCC, 7 pin through capacitor C 11 filtering and are connected with 2 pin of connection terminal J9 by resistance R 22 and will send into proportioning valve amplifier control ratio valve by the simulation model of DA chip U7 conversion by J9; The model of DA chip is TLV5618.
Described prestress anchorage system is controlled testing table automatically, and its described reversal valve control circuit comprises resistance R 14, R21, triode Q1, Q2, diode D1; Q1 and Q2 constitute compound transistor, and the collector of triode Q2 connects the external reversal valve coil of 5 pin, connection terminal J9 of connection terminal J9; The base stage of triode Q1 is connected with 28 pin of single-chip microcomputer U5 by resistance R 14.The Single-chip Controlling signal enters the electric current of the external reversal valve coil of compound transistor control J9 by R14.
Described prestress anchorage system is controlled testing table automatically, its described communicating circuit comprises serial port chip U6, capacitor C 8, C9, C10, C12, C13, connection terminal J3,9 pin of serial port chip U6 connect 2 pin of single-chip microcomputer U5,10 pin connect 3 pin of single-chip microcomputer U5,2 pin that 7 pin meet connection terminal J3,1 pin that 8 pin meet connection terminal J3, and the external RS232 of connection terminal J3 also connects computer; The model of serial port chip U6 is MAX232ACPE (16).
Described prestress anchorage system is controlled testing table automatically, and its described power circuit comprises connection terminal J1, filter capacitor C1, C2, C3, C4; 1 pin of connection terminal J1 connects the 24V power supply, 2 pin ground connection, and 3 pin meet power supply VCC, and capacitor C 2, C4 are to the 24V power filter, and capacitor C 1, C3 are to power supply VCC filtering, and this power circuit is used to total system that power supply is provided.
The present invention compares with prior art and has the following advantages:
(1) can in one-step installation, finish following experiment accurately: static load experiment, repeat tensioning process experiment, intermediate plate and twisted wire bounce back synchronously experiment, the experiment of ground tackle retraction and full frictional resistance test.Its repeatable accuracy height, good reliability improves conventional efficient greatly, is convenient to the ground tackle connector is implemented total quality control.
(2) adopt miniature displacement transducer to gather the amount of recovery of steel strand wires, intermediate plate, from motion tracking, can depict its synchronous curve, degree of accuracy is higher, has improved the automatization level of equipment.
(3) setting up of solenoid valve realized that experiment finishes and moves back the top automatically, has further improved the automatization level of equipment.
(4) provide the function of pressure digital display instrument and compunication, the power value that can gather stretch-draw end and Partner simultaneously.
(5) software and hardware system and computing machine are installed in the control box of an integral body, both be convenient to centralized control, simplified again and installed and operation, make equipment generous attractive in appearance, overall performance is good.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the interface synoptic diagram of front tank of the present invention
Fig. 3 is the power circuit diagram of control circuit of the present invention
Fig. 4 is the single chip circuit figure of control circuit of the present invention
Fig. 5 is the reference circuit figure of control circuit of the present invention
Fig. 6 is the Acquisition Circuit figure of control circuit of the present invention
Fig. 7 is the Proportion valve controlling circuit figure of control circuit of the present invention
Fig. 8 is the reversal valve control circuit figure of control circuit of the present invention
Fig. 9 is the communicating circuit figure of control circuit of the present invention
Figure 10 is a software flow pattern of the present invention
Synoptic diagram when Figure 11 tests for the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Automatically control testing table referring to prestress anchorage system illustrated in figures 1 and 2, the oil pump station 12 that comprise long table frame 33, be connected the lifting jack 32 of outside, bottom, long table frame left side, links to each other by high-pressure oil pipe 3 and low pressure pipe 4 with lifting jack, be located at the computing machine 18 on control desk 17 tops, the front tank 16 that is located at control desk 17 bottoms and is connected with computing machine, front tank is connected with the 220V power supply by first power lead 15, and oil pump station is connected with the 380V power supply by second source line 13;
One end of one short stand 27 is connected with the outside of long table frame lower right side, and a pressure transducer 26 is connected with the other end of short stand; This pressure transducer is connected with pressure digital display instrument 19 by first lead 21, and this pressure digital display instrument is connected with front tank 16 by second lead 14, and is connected with the 220V power supply by the 3rd power lead 20;
One combination valve 10 is located on the oil pump station 12, is provided with the solenoid valve 8, proportional pressure control valve 11 and the oil pressure sensor 9 that link to each other with front tank 16 on combination valve 10;
One status of a sovereign displacement sensor 34 is located on the lifting jack 32, and this status of a sovereign displacement sensor is connected with front tank;
Many miniature displacement transducers 22 are located on the magnetic force gauge stand 36 of short stand 27 end faces by support bar, and are connected with front tank 16 by many miniature displacement transducer signal lines 23.
Described front tank 16 is provided with 220V power interface 50, RS232 interface 49, status of a sovereign displacement sensor interface 40, solenoid valve interface 38, proportional pressure control valve interface 37, oil pressure sensor interface 39,8 miniature displacement transducer interfaces 41,42,43,44,45,46,47,48, the 220V power interface 50 on the front tank 16 is connected with 220V power supply 20, RS232 interface 49 is connected with pressure digital display instrument 19 by RS232 signal wire 14, status of a sovereign displacement sensor interface 40 is connected with status of a sovereign displacement sensor 34 by status of a sovereign displacement sensor signal wire 31, solenoid valve interface 38 is connected with solenoid valve 8 by control line of electromagnetic valve 7, proportional pressure control valve interface 37 passing ratio surplus valve control lines 5 are connected with proportional pressure control valve 11, oil pressure sensor interface 39 is connected with oil pressure sensor 9 by oil pressure sensor signal wire 6,8 miniature displacement transducer interfaces 41,42,43,44,45,46,47,48 pass through 8 miniature displacement transducer signal lines 23 is connected with 8 miniature displacement transducers 22.
The status of a sovereign displacement sensor gauge head 35 of described status of a sovereign displacement sensor 34 is connected with the circular big baffle plate 2 of lifting jack by the circular small front apron 1 that is installed on the lifting jack.
Referring to Fig. 4, in front tank 16, be provided with control circuit, this control circuit comprises single chip circuit, reference circuit, Acquisition Circuit, Proportion valve controlling circuit, reversal valve control circuit, communicating circuit and power circuit; Described single chip circuit comprises single-chip microcomputer U5, capacitor C 6, reset resistor R20 and by crystal oscillator Y1, the oscillatory circuit that capacitor C 14, C15 constitute; Capacitor C 6 is connected on 7 pin of single-chip microcomputer U5, is used to the power filter of single-chip microcomputer; The reset resistor R20 one termination power VCC other end connects 1 pin of single-chip microcomputer U5, provides reset signal for single-chip microcomputer when being used to power on; 9 pin, the other end of the crystal oscillator Y1 one termination single-chip microcomputer U5 of oscillatory circuit connects 10 pin of single-chip microcomputer U5, is used to single-chip microcomputer that frequency of operation is provided; The model of single-chip microcomputer U5 is ATMEGA8, and this single chip circuit is used to control total system.
Referring to Fig. 5, described reference circuit comprises first reference circuit and second reference circuit; First reference circuit comprises reference source U1, operational amplifier U3, resistance R 15, R2, R3, R17, R18, R19 and capacitor C 5; Power supply VCC connects the 2 pin ground connection, 3 pin of 1 pin of reference source U1 and 3 pin, reference source U1 3 pin by resistance R 2 concatenation operation amplifier U3 by resistance R 15; 2 pin of operational amplifier U3 meet reference voltage output end REF5V by resistance R 3 ground connection and by resistance R 17, R19,4 pin ground connection, and 8 pin were connected the 24V power supply of capacitor C 5 filtering, and 1 pin meets reference voltage output end REF5V by resistance R 18; Be used for providing the quantification benchmark to the Acquisition Circuit of back; Second reference circuit comprises reference source U2, resistance R 16; Power supply VCC meets reference voltage output end REF2.5 by 1 pin and 3 pin, the 2 pin ground connection of reference source U2,3 pin that resistance R 16 connects reference source U2; Be used for providing the quantification benchmark to the Proportion valve controlling circuit of back; The model of reference source U1, U2 is TL431, and the model of operational amplifier U3 is LM358.
Referring to Fig. 6, described Acquisition Circuit comprises the connection terminal J2 of external pressure transducer 26, meet connection terminal J4, J5, J6, the J8 of 8 microsensors 22, meet the connection terminal J7 of status of a sovereign displacement sensor 34 and oil pressure sensor 9, the RC filtering circuit that resistance R 1, R4, R5, R6, R7, R8, R9, R11, R12, R110, R13 and capacitor C 24, C23, C22, C21, C20, C19, C18, C17, C25, C26 constitute, acquisition chip U4; The simulating signal of sensor acquisition is imported acquisition chip U4 into by connection terminal after filtering, U4 is converted into digital signal and exports to single-chip microcomputer U5; 14 pin of acquisition chip U4 are connected with the reference voltage output end REF5V of first reference circuit, and the 15-18 pin is connected with the 16-19 pin of single-chip microcomputer U5 respectively; The model of acquisition chip U4 is TLC2543.
Referring to Fig. 7, described Proportion valve controlling circuit comprises DA chip U7, connection terminal J9, resistance R 22, capacitor C 11; Reference voltage output end REF2.5,8 pin that the 1-3 pin of DA chip U7 is connected with the 4-6 pin of single-chip microcomputer U5,5 pin ground connection, 6 pin connect second reference source connect power supply VCC, 7 pin through capacitor C 11 filtering and are connected with 2 pin of connection terminal J9 by resistance R 22 and will send into proportioning valve amplifier control ratio valve by the simulation model of DA chip U7 conversion by J9; The model of DA chip is TLV5618.
Referring to Fig. 8, described reversal valve control circuit comprises resistance R 14, R21, triode Q1, Q2, diode D1; Q1 and Q2 constitute compound transistor, and the collector of triode Q2 connects the external reversal valve coil of 5 pin, connection terminal J9 of connection terminal J9; The base stage of triode Q1 is connected with 28 pin of single-chip microcomputer U5 by resistance R 14.The Single-chip Controlling signal enters the electric current of the external reversal valve coil of compound transistor control J9 by R14.
Referring to Fig. 9, described prestress anchorage system is controlled testing table automatically, it is characterized in that: described communicating circuit comprises serial port chip U6, capacitor C 8, C9, C10, C12, C13, connection terminal J3,9 pin of serial port chip U6 connect 2 pin of single-chip microcomputer U5,3 pin that 10 pin meet single-chip microcomputer U5,2 pin that 7 pin meet connection terminal J3,1 pin that 8 pin meet connection terminal J3, and the external RS232 of connection terminal J3 also connects computer; The model of serial port chip U6 is [MAX232ACPE (16)].
Referring to Fig. 3, described power circuit comprises connection terminal J1, filter capacitor C1, C2, C3, C4; 1 pin of connection terminal J1 connects the 24V power supply, 2 pin ground connection, and 3 pin meet power supply VCC, and capacitor C 2, C4 are to the 24V power filter, and capacitor C 1, C3 are to power supply VCC filtering, and this power circuit is used to total system that power supply is provided.
During experiment, proportional pressure control valve 11 is installed on the combination valve 10 of oil pump 12, and passing ratio surplus valve control line 5 is connected with the proportional pressure control valve interface 37 of front tank 16; Status of a sovereign displacement sensor 34 by being installed, a piece is connected on the shell of lifting jack 32, status of a sovereign displacement sensor gauge head 35 is fixed on the circular small front apron 1 of lifting jack on the circular big baffle plate 2 of lifting jack, and is connected with the status of a sovereign displacement sensor interface 40 of front tank 16 by status of a sovereign displacement sensor signal wire 31; The connecting screw rod of oil pressure sensor 9 is connected on the screw of oil pump station 12, and is connected with the oil pressure sensor interface 39 of front tank 16 by oil pressure sensor signal wire 6; Computing machine 18 is connected with the RS232 interface 49 of front tank 16 by the RS232 signal wire; The power interface 50 of front tank 16 is connected with the 220V power supply by the 3rd power lead 20;
The connector 28 that to be tested is located by connecting on by the gasket ring that carries on the inside of lower right side of long table frame, the interior ground tackle that one end of many steel strand wires 29 is connected with lifting jack 32, the other end passes on the connector 28 passes short stand 27 again, is connected with the pressure transducer 26 that is located at short stand right side, anchor plate 25 and ground tackle 24; After transferring Suo Dingwei, steel strand wires of mounting strap extruded sleeve on the outer groove of connector 28 again, and pass the long table frame other end, lifting jack 32, anchor plate by root, and enter in the ground tackle, transfer Suo Dingwei then.In computing machine 18, carry out the parameter setting by requirement of experiment and experiment standard, start the oil pump of oil pump station 12, computing machine sends signal (digital quantity) and converts the magnitude of current to and amplify to front tank 16 by the RS232 signal wire, current signal through proportional pressure control valve control line 5 control ratio surplus valves 11 with automatic control jack cylinder pressure.The pressure of jack cylinder converts voltage signal to by oil pressure sensor 9, is sent to front tank 16 through oil pressure sensor control line 6, and voltage signal is converted to digital signal, handles through RS232 signal wire input computing machine 18 again; In this simultaneously, the displacement of jack piston sends to front tank 16 with voltage signal through status of a sovereign displacement sensor control line 31 by status of a sovereign displacement sensor 34, converts voltage signal to digital signal and handles through RS232 signal wire input computing machine 18.Pressure transducer 26 is converted to voltage signal with Partner pressure, passes to pressure digital display instrument 19 by pressure sensor signal line 21, and pressure digital display instrument 19 converts voltage signal to digital signal and handles through RS232 signal wire 14 input computing machines 18.8 miniature displacement transducers 22 pass to front tank 16 by 8 miniature displacement transducer signal lines 23 with voltage signal, and front tank is converted to digital signal with voltage signal, handle through RS232 signal wire input computing machine 18.
Referring to Figure 10, supervisory system on the computing machine 18 collects the data that front tank 16 sends, and shows initiatively stretching force, the stretching force of passive stretch-draw end, lifting jack elongation, steel strand wires amount of recovery, intermediate plate amount of recovery, the anchor deformation amount of stretch-draw end in real time by software processes; Show pressure/displacement curve, pressure/time curve, displacement/time curve, anchor deformation comparison diagram in real time; Carry out automatic pressure lifting control according to the experiment kind, can report to the police automatically and safety stops to abnormal conditions in the experimentation, draws corresponding data, image, form, report after experiment finishes.
Installation steps of the present invention:
Referring to Figure 11, install pressure transducer 26, lifting jack 32 successively at the right-hand member of the stand body 33 that places, this end just is called driven end; At stand body left end clump 54 is installed then, this end is exactly a drive end.
Driven end is installed: for the ease of location and installation, an anchor plate 25 is installed, then ground tackle 24 is installed in anchor plate 25 right sides on lifting jack one right side, so far, the installation of driven end main body.Drive end is installed: backing plate 56 is installed in the stopper slot on the clump 54.
At this moment, penetrate steel strand wires 29 by root, note when wearing twisted wire aligning with position, left end ground tackle hole, prevent to beat strand, the intermediate plate of packing into then it should be noted that earlier before intermediate plate is installed and will clean intermediate plate, allow lifting jack 32 elongation as far as possible of driven end simultaneously, like this so that in experimentation to the bit shift compensation of drive end.Then limiting plate 55 and backing plate 56 are penetrated steel strand wires, adjust the steel strand wires position, make its centre that places limiting plate 55 and backing plate 56, then drive end lifting jack 32 is aligned steel strand wires and penetrate, then erecting tools anchor 51 and status of a sovereign displacement sensor 34.
Subsequently miniature displacement sensor bracket 52 is installed in and is used for fixing 5 miniature displacement transducers 22 of surveying intermediate plate and twisted wire axial displacement on the stand pole 53, again 3 magnet bases that have miniature displacement transducer 22 are fixed on above the ground tackle 24, be used for the radial displacement of tested steel twisted wire, these 8 miniature displacement transducers are mainly used in test ground tackle frictional resistance retraction value first.
The machinery of whole like this platform experiment platform is installed and has just been finished.
Operation steps of the present invention:
After assembly installs, carry out test by following program, can realize that one-step installation presstressed reinforcing steel-ground tackle assembly gets final product integrated target of carrying out above-mentioned Multitest content:
1) applies initial stress.The nervous pull end ground tackle limiting plate of elder generation's rammer is then in single initial stress (the steel strand wires tensile strength standard value that applies of stiff end ground tackle one side
f Ptk10%), and adjust in turn and be no less than 4 times, be evenly distributed until each root steel strand wires initial stress.
2) press at the stretch-draw end
f Ptk20%, 40%, 60%, 80% fen 4 grades of constant speed load (loading velocity by computer controlled automatic at 100MPa/min), each pause point is held the lotus time and is as the criterion so that driven end (stiff end) force transducer displayed value is stable; Simultaneous computer is drawn the displacement △ of presstressed reinforcing steel and ground tackle part
a, △
bWith load increment correlation curve (this curve is only drawn in the stretching process in the first time).
3), read stretch-draw end end and stiff end force transducer power value in each pause point of the stretch-draw first time
F 1With
F 2, according to
F 1With
F 2Difference calculate the anchored end friction loss
μ, reach with the load rank
f PtkThe friction loss that obtained in 80% o'clock be as the criterion.
4) record the anchored end friction loss after, put the tension prestress muscle and drive the anchor clipper anchoring temporarily, treat to read the power value at stiff end again after stable
F 2', according to
F 2With
F 2' difference calculate the ground tackle neck-in.
5) loosening presstressed reinforcing steel at stiff end arrives
f Ptk* 10% initial stress level.
6) repeat above 1) ~ 5) step 4 time, obtain the value that contracts in 5 groups of anchored end frictional resistance values and the ground tackle, ask its mean value.
7) the last time add static test in (the 5th) stretching process.A selected steel strand wires installation position displacement sensor and be each parts decrement △ of reference measure testing machine under the initial stress state with ground
L', then step by step stretch-draw until
f Ptk80%, read the power value
F 1With
F 2Ask the frictional resistance value, the frictional resistance off-test; Hold anchoring temporarily behind the lotus 1h, read the power value at stiff end
F 2', according to
F 2With
F 2' difference calculate ground tackle neck-in, the off-test of contracting in the ground tackle; In driven end loading stretch-draw, rupture the record ultimate tension up to presstressed reinforcing steel
F Apu, jack piston elongation △
LWith testing machine decrement △
L', calculate the ground tackle efficiency factor
η aWith power muscle overall strain ε
Apu, and the destruction situation of observing presstressed reinforcing steel, ground tackle, static test finishes.
The whole test program repeats stretch-draw assembly 5 times, each stretch-draw divide 4 grades carry out and contain anchoring temporarily 1 time, move back anchor and loosen the power muscle 1 time, ground tackle has obtained abundant check to the adaptability of stretch-draw anchor technology in this process.
Claims (10)
1. prestress anchorage system is controlled testing table automatically, comprise long table frame (33), be connected the lifting jack (32) of outside, bottom, long table frame left side, by the continuous oil pump station (12) of high-pressure oil pipe (3) and low pressure pipe (4) and lifting jack, be located at the computing machine (18) on control desk (17) top, the front tank (16) that is located at control desk (17) bottom and is connected with computing machine, front tank is connected with the 220V power supply by first power lead (15), oil pump station is connected with the 380V power supply by second source line (13), it is characterized in that:
One end of one short stand (27) is connected with the outside of long table frame lower right side, and a pressure transducer (26) is connected with the other end of short stand; This pressure transducer is connected with pressure digital display instrument (19) by first lead (21), and this pressure digital display instrument is connected with front tank (16) by second lead (14), and is connected with the 220V power supply by the 3rd power lead (20);
One combination valve (10) is located on the oil pump station (12), is provided with the solenoid valve (8), proportional pressure control valve (11) and the oil pressure sensor (9) that link to each other with front tank (16) on combination valve (10);
One status of a sovereign displacement sensor (34) is located on the lifting jack (32), and this status of a sovereign displacement sensor is connected with front tank;
Many miniature displacement transducers (22) are located on the magnetic force gauge stand (36) of short stand (27) end face by support bar, and are connected with front tank (16) by many miniature displacement transducer signal lines (23).
2. prestress anchorage system according to claim 1 is controlled testing table automatically, it is characterized in that: described front tank (16) is provided with 220V power interface (50), RS232 interface (49), status of a sovereign displacement sensor interface (40), solenoid valve interface (38), proportional pressure control valve interface (37), oil pressure sensor interface (39), 8 miniature displacement transducer interfaces (41,42,43,44,45,46,47,48), the 220V power interface (50) on the front tank (16) is connected with 220V power supply (20), RS232 interface (49) is connected with pressure digital display instrument (19) by RS232 signal wire (14), status of a sovereign displacement sensor interface (40) is connected with status of a sovereign displacement sensor (34) by status of a sovereign displacement sensor signal wire (31), solenoid valve interface (38) is connected with solenoid valve (8) by control line of electromagnetic valve (7), proportional pressure control valve interface (37) passing ratio surplus valve control line (5) is connected with proportional pressure control valve (11), oil pressure sensor interface (39) is connected with oil pressure sensor (9) by oil pressure sensor signal wire (6), 8 miniature displacement transducer interfaces (41,42,43,44,45,46,47,48) be connected with 8 miniature displacement transducers (22) by 8 miniature displacement transducer signal lines (23).
3. prestress anchorage system according to claim 1 and 2 is controlled testing table automatically, it is characterized in that: the status of a sovereign displacement sensor gauge head (35) of described status of a sovereign displacement sensor (34) is connected with the circular big baffle plate (2) of lifting jack by the circular small front apron (1) that is installed on the lifting jack.
4. prestress anchorage system according to claim 1 and 2 is controlled testing table automatically, it is characterized in that: be provided with control circuit in front tank (16), this control circuit comprises single chip circuit, reference circuit, Acquisition Circuit, Proportion valve controlling circuit, reversal valve control circuit, communicating circuit and power circuit; Described single chip circuit comprises single-chip microcomputer U5, capacitor C 6, reset resistor R20 and by crystal oscillator Y1, the oscillatory circuit that capacitor C 14, C15 constitute; Capacitor C 6 is connected on 7 pin of single-chip microcomputer U5, is used to the power filter of single-chip microcomputer; The reset resistor R20 one termination power VCC other end connects 1 pin of single-chip microcomputer U5, provides reset signal for single-chip microcomputer when being used to power on; 9 pin, the other end of the crystal oscillator Y1 one termination single-chip microcomputer U5 of oscillatory circuit connects 10 pin of single-chip microcomputer U5.
5. prestress anchorage system according to claim 4 is controlled testing table automatically, it is characterized in that: described reference circuit comprises first reference circuit and second reference circuit; First reference circuit comprises reference source U1, operational amplifier U3, resistance R 15, R2, R3, R17, R18, R19 and capacitor C 5; Power supply VCC connects the 2 pin ground connection, 3 pin of 1 pin of reference source U1 and 3 pin, reference source U1 3 pin by resistance R 2 concatenation operation amplifier U3 by resistance R 15; 2 pin of operational amplifier U3 meet reference voltage output end REF5V by resistance R 3 ground connection and by resistance R 17, R19,4 pin ground connection, and 8 pin were connected the 24V power supply of capacitor C 5 filtering, and 1 pin meets reference voltage output end REF5V by resistance R 18; Be used for providing the quantification benchmark to the Acquisition Circuit of back; Second reference circuit comprises reference source U2, resistance R 16; Power supply VCC meets reference voltage output end REF2.5 by 1 pin and 3 pin, the 2 pin ground connection of reference source U2,3 pin that resistance R 16 connects reference source U2.
6. prestress anchorage system according to claim 4 is controlled testing table automatically, it is characterized in that: described Acquisition Circuit comprises the connection terminal J2 of external pressure transducer (26), meet connection terminal J4, J5, J6, the J8 of 8 microsensors (22), meet the connection terminal J7 of status of a sovereign displacement sensor (34) and oil pressure sensor (9), the RC filtering circuit that resistance R 1, R4, R5, R6, R7, R8, R9, R11, R12, R110, R13 and capacitor C 24, C23, C22, C21, C20, C19, C18, C17, C25, C26 constitute, acquisition chip U4; The simulating signal of sensor acquisition is imported acquisition chip U4 into by connection terminal after filtering, U4 is converted into digital signal and exports to single-chip microcomputer U5; 14 pin of acquisition chip U4 are connected with the reference voltage output end REF5V of first reference circuit, and the 15-18 pin is connected with the 16-19 pin of single-chip microcomputer U5 respectively; The model of acquisition chip U4 is TLC2543.
7. prestress anchorage system according to claim 4 is controlled testing table automatically, it is characterized in that: described Proportion valve controlling circuit comprises DA chip U7, connection terminal J9, resistance R 22, capacitor C 11; Reference voltage output end REF2.5,8 pin that the 1-3 pin of DA chip U7 is connected with the 4-6 pin of single-chip microcomputer U5,5 pin ground connection, 6 pin connect second reference source connect power supply VCC, 7 pin through capacitor C 11 filtering and are connected with 2 pin of connection terminal J9 by resistance R 22 and will send into proportioning valve amplifier control ratio valve by the simulation model of DA chip U7 conversion by J9; The model of DA chip is TLV5618.
8. prestress anchorage system according to claim 4 is controlled testing table automatically, it is characterized in that: described reversal valve control circuit comprises resistance R 14, R21, triode Q1, Q2, diode D1; Q1 and Q2 constitute compound transistor, and the collector of triode Q2 connects the external reversal valve coil of 5 pin, connection terminal J9 of connection terminal J9; The base stage of triode Q1 is connected with 28 pin of single-chip microcomputer U5 by resistance R 14; The Single-chip Controlling signal enters the electric current of the external reversal valve coil of compound transistor control J9 by R14.
9. prestress anchorage system according to claim 4 is controlled testing table automatically, it is characterized in that: described communicating circuit comprises serial port chip U6, capacitor C 8, C9, C10, C12, C13, connection terminal J3,9 pin of serial port chip U6 connect 2 pin of single-chip microcomputer U5,10 pin connect 3 pin of single-chip microcomputer U5,2 pin that 7 pin meet connection terminal J3,1 pin that 8 pin meet connection terminal J3, and the external RS232 of connection terminal J3 also connects computing machine.
10. prestress anchorage system according to claim 4 is controlled testing table automatically, it is characterized in that: described power circuit comprises connection terminal J1, filter capacitor C1, C2, C3, C4; 1 pin of connection terminal J1 connects the 24V power supply, 2 pin ground connection, and 3 pin meet power supply VCC, and capacitor C 2, C4 are to the 24V power filter, and capacitor C 1, C3 are to power supply VCC filtering, and this power circuit is used to total system that power supply is provided.
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| CN2010105684714A CN102062620B (en) | 2010-12-01 | 2010-12-01 | Automatic control test bed of prestressed anchorage system |
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| CN2010105684714A CN102062620B (en) | 2010-12-01 | 2010-12-01 | Automatic control test bed of prestressed anchorage system |
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| CN102062620B CN102062620B (en) | 2012-07-25 |
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| CN103884640A (en) * | 2014-03-21 | 2014-06-25 | 北京工业大学 | Prestressed pipeline friction testing apparatus and installation method of apparatus |
| CN110907286A (en) * | 2019-11-20 | 2020-03-24 | 华南理工大学 | VHM combined load loading system for large-scale model test |
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| Publication number | Publication date |
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| CN102062620B (en) | 2012-07-25 |
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