CN105113417A - Bridge prestress tensioning system - Google Patents
Bridge prestress tensioning system Download PDFInfo
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- CN105113417A CN105113417A CN201510583164.6A CN201510583164A CN105113417A CN 105113417 A CN105113417 A CN 105113417A CN 201510583164 A CN201510583164 A CN 201510583164A CN 105113417 A CN105113417 A CN 105113417A
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Abstract
A bridge prestress tensioning system comprises a computer unit, a tensioning instrument, a displacement sensor, a jack, a pressure sensor, a force sensor and a controller. The displacement sensor is arranged on the outer side of a cylinder barrel of the jack and connected with a piston rod, and the force sensor is arranged on a cylinder barrel base of the jack; the tensioning instrument comprises a temperature sensor arranged on the side wall of an oil tank, and the computer unit can send a signal and drives the jack to carry out tensioning operation through the controller; the controller is connected with the displacement sensor, the force sensor and the temperature sensor and transmits data information collected by the sensors to the computer unit to be further processed; and the force sensor, the displacement sensor and the temperature sensor are connected with the controller to achieve intelligence and standardization of bridge prestress tensioning work; and the system is scientific and reasonable in whole structure, convenient to install and operate, high in work automation degree, reliable in equipment running and capable of being widely suitable for being used in cooperation with various bridge prestress tensioning systems.
Description
Technical field
The present invention relates to a kind of bridge prestress tensioning system.
Background technology
Current existing prestress tensioning equipment and Control Component thereof comprise the collection control unit of each data when stretch-draw opens and closes control unit and is used for gathering stretch-draw operation, and tensioning equipment comprises oil pump unit, motor, drived control mechanism, fuel tank, cylinder apparatus etc.; The pressure sensor measuring oil pressure value is equiped with in fuel tank, stretch-draw cylinder apparatus is installed the displacement transducer being used for measuring oil cylinder piston shift value, the solenoid electric valve for the turnover of hydraulic control oil is equiped with in fuel tank, fuel tank is installed data collection control unit, be connected with computer unit by wireless or wired mode; Data are preserved to the automatic data collection of stretching force, stretch value when implementing stretch-draw operation, can synchronism operation be carried out, complete stretch-draw record, substantially achieve intelligent tensioning process.
But also there is many deficiencies in existing tensioning system: as Sensor Problem, when pressure sensor is measured, the force value being only jack oil-in of general measure is not stress value, and the data that pressure sensor detects easily are subject to the impact of oil temperature, oil viscosity and impurity; As hydraulic fluid temperature aspect, when in prior art, hydraulic means runs, hydraulic oil high-speed motion, temperature constantly raises, and hydraulic pressure oil viscosity changes, and causes hydraulic system to occur leaking or falling pressure, during north of china in winter construction, environment temperature is very low, and cause hydraulic oil viscosity very large, driving, measurement etc. all have certain difficulty; Force value synchronism control problem, motor speed is non-adjustable, or simply carries out oil-feed according to same oil-feed speed, and railroad bridge prestressed pore passage frictional resistance is very large, and two ends shift value is asynchronous excessive; Rate of debarkation control aspect, mostly adopts the relief hole of same diameter to carry out pressure release, or utilizes valve block itself to carry out pressure release, and pressure release speed is single and very fast, causes jack cylinder to define impact to steel strand, result in excessive loss of prestress; Compatibility function aspect, for railroad bridge pre-stress construction, duct friction resistance test is very important, and every 100 beams must do once, and present equipment does not have this function, and test needs to adopt a set of equipment in addition; Information Security aspect, existing equipment is all manually compile data, or after automatically record stores, print and transmission.
Disclose a kind of tensioning system in patent of invention CN201210460779, solve some technical problems existed in this area, such as above-mentioned force value synchronism control problem and Information Security aspect; But do not relate to other problem in this patent, as force snesor problem and hydraulic fluid temperature problem.
Summary of the invention
For above-mentioned situation, the object of the invention is to provide a kind of bridge prestress tensioning system, and it to be connected by arranging force snesor, displacement transducer and temperature pick up the intellectuality and standardization that realize bridge prestress stretch-draw operation with controller; And overall structure is scientific and reasonable, to install and easy to operate, working automation degree be high, reliability by force, be easy to promote the popularization use.
For realizing above-mentioned task, a kind of bridge prestress tensioning system, it comprises computer unit, stretch-draw instrument, displacement transducer, jack, pressure sensor, force snesor and controller; Outside the cylinder barrel that institute's displacement sensors is arranged at jack and the extension elongation be connected with piston rod for measuring piston rod, for measuring the force value of hydraulic oil in jack oil suction chamber in the inner wall of cylinder that described pressure sensor is arranged on jack, the cylinder barrel base that described force snesor is arranged at jack is connected the stress value for measuring during jack tension steel strand with beam body; Described stretch-draw instrument comprise be arranged at fuel tank sidewall temperature pick up for measuring the temperature of hydraulic oil, the signal that described controller energy receiving computer unit sends controls the hydraulic means of stretch-draw instrument and drives the steel strand on jack pair beam body to carry out tension operation, and described controller is connected with displacement transducer, pressure sensor, force snesor and temperature pick up respectively and the data information transfer that described sensor gathers is for further processing to computer unit.
For realizing structure of the present invention, effect optimization, its further step: the frequency converter that described stretch-draw instrument comprises hydraulic means, radiator fan, cooler, electrothermal tube, temperature pick up, variable-frequency motor and is connected with controller.
The stepper motor that described hydraulic means comprises oil pump unit, pressure meter, hydraulic valve block, cleaner, reversal valve, digital throttle and is connected with digital throttle, described oil pump unit is connected with fuel tank, the hydraulic oil for refluxing after filtering jack pressure release on the oil return opening that described cleaner is connected to oil pump unit.
Described reversal valve and stepper motor are connected with controller respectively, and described stepper motor is for controlling to adjust the flow of digital throttle.
The force value that described pressure meter is connected to also available pressure sensor and/or force snesor on hydraulic valve block is checked.
The hydraulic oil UNICOM of detecting head in the oil guiding hole and fuel tank of fuel tank sidewall of described temperature pick up, described controller whether can exceed setting range to control startup electrothermal tube according to oil temperature that temperature pick up is surveyed or cooler regulates oil temperature automatically.
Described controller comprises and control treatment module and the wireless receiving module with control treatment model calling, and this wireless receiving module adopts wireless transmission frequency and the computer unit exchange data information of 433MHz.
Described force snesor is radial force snesor and is fixedly connected on the cylinder barrel base of jack through screw, and this force snesor adopts calibration equation to convert and calibrates.
Oil suction chamber and the oil back chamber of described jack are connected with hydraulic valve block through oil guide pipe.
Described jack and stretch-draw instrument are more than two and arrange in pairs, can carry out tension operation simultaneously, can carry out tension operation when all arranging four to the steel strand at two ends on diplopore beam body simultaneously when all arranging two to the steel strand at two ends on single hole beam body.
A kind of bridge prestress tensioning system of the present invention, it comprises computer unit, stretch-draw instrument, displacement transducer, jack, pressure sensor, force snesor and controller; Outside the cylinder barrel that institute's displacement sensors is arranged at jack and the extension elongation be connected with piston rod for measuring piston rod, for measuring the force value of hydraulic oil in jack oil suction chamber in the inner wall of cylinder that described pressure sensor is arranged on jack, the cylinder barrel base that described force snesor is arranged at jack is connected the stress value for measuring during jack tension steel strand with beam body; Described stretch-draw instrument comprise be arranged at fuel tank sidewall temperature pick up for measuring the temperature of hydraulic oil, the signal that described controller energy receiving computer unit sends controls the hydraulic means of stretch-draw instrument and drives the steel strand on jack pair beam body to carry out tension operation, and described controller is connected with displacement transducer, pressure sensor, force snesor and temperature pick up and the technical scheme that is for further processing to computer unit of the data information transfer gathered by described sensor respectively; It to be connected by arranging force snesor, displacement transducer and temperature pick up the intellectuality and standardization that realize bridge prestress stretch-draw operation with controller; And overall structure is scientific and reasonable, install and easy to operate, digital regulated precision is high, and equipment is reliable, and operation automation degree is high, is easy to promote the popularization use.
The beneficial effect that the present invention is produced compared to existing technology:
I, the hydraulic means that the present invention adopts is provided with digital throttle, aperture by digital throttle in uninstall process regulates rate of debarkation, slow pressure release can be ensured, avoid in release oil return process there is prestress wire ultra stretching, stripped thread, return back to top the problems such as too fast collision ground tackle, reduces prestressed loss;
II, the present invention adopts displacement transducer to be directly connected with the piston rod of jack, can the change in displacement of induction piston bar in real time, the stretch value of reaction prestress wire, certainty of measurement is high, not by interference from human factor, and by contrasting can carry out duct friction test to the steel strand actual elongation value of displacement sensor and the deviation of theory calculate stretch value;
III, the cylinder barrel base that the present invention adopts force snesor to be arranged at jack is connected with controller, directly can measure the stress value during steel strand on jack tension beam body, it is more accurate to measure, and stress value control accuracy during stretch-draw operation is ± 1.5%, and can realize data intelligent process;
IV, the present invention adopts temperature pick up to be arranged at fuel tank sidewall and the temperature of the automatic regulator solution force feed of via controller, the impact of surrounding environment on tensioning system can be reduced, improve the degree of accuracy of measurement, and can prevent hydraulic system from occurring to leak or fall pressure, thus improve fuel feeding effect;
V, the present invention adopts temperature pick up and cooler, electrothermal tube acting in conjunction, for the oil temperature of accurate hydraulic control oil, thus protection hydraulic oil and the application life for extending whole tensioning system;
VI, the present invention adopts frequency converter to be connected the operating frequency controlling variable-frequency motor with controller, the oil-feed flow and speed that change jack can be adjusted in real time according to stretch-draw desired value, thus realize controlling tensioning speed, overcome the uneven problem of prestressing force and realize data intelligent process;
VII, the present invention realizes intellectuality and the standardization of bridge prestress stretch-draw operation by arranging force snesor, displacement transducer and temperature pick up etc.; And overall structure is scientific and reasonable, install and easy to operate, digital regulated precision is high, and equipment is reliable, and operation automation degree is high, alleviates labour intensity, improves production efficiency, and manufacturing cost significantly reduces, wide market, is convenient to promote the use of.
The present invention is widely used in the system support of different types of rridges prestressed stretch-draw and uses.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
The accompanying drawing forming the application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the stretch-draw schematic diagram of jack of the present invention.
Fig. 3 is the rear elevation of stretch-draw instrument of the present invention.
Fig. 4 is the front elevation drawing of stretch-draw instrument of the present invention.
Fig. 5 is the stretch-draw operation schematic diagram of the present invention and single hole beam body.
Fig. 6 is the stretch-draw operation schematic diagram of the present invention and diplopore beam body.
In figure: 1-computer unit, 2-stretch-draw instrument, 21-hydraulic means, 211-oil pump unit, 212-pressure meter, 213-hydraulic valve block, 214-reversal valve, 215-digital throttle, 216-stepper motor, 217-cleaner, 22-radiator fan, 23-cooler, 24-electrothermal tube, 25-variable-frequency motor, 26-temperature pick up, 3-displacement transducer, 4-jack, 41-oil suction chamber, 42-cylinder barrel, 43-oil back chamber, 44-piston rod, 5-pressure sensor, 6-force snesor, 7-controller, 71-control treatment module, 72-wireless receiving module, 8-beam body, 81-steel strand.
Detailed description of the invention
With reference to accompanying drawing, the present invention is achieved in that a kind of bridge prestress tensioning system, and it comprises computer unit 1, stretch-draw instrument 2, displacement transducer 3, jack 4, pressure sensor 5, force snesor 6 and controller 7; Outside the cylinder barrel 42 that institute's displacement sensors 3 is arranged at jack 4 and the extension elongation be connected with piston rod 44 for measuring piston rod 44, for measuring the force value of hydraulic oil in jack 4 oil suction chamber 41 on cylinder barrel 42 inwall that described pressure sensor 5 is arranged on jack 4, cylinder barrel 42 base that described force snesor 6 is arranged at jack 4 is connected the stress value for measuring during jack 4 tension steel strand 81 with beam body 8; Described stretch-draw instrument 2 comprise be arranged at fuel tank sidewall temperature pick up 26 for measuring the temperature of hydraulic oil, the signal that described controller 7 energy receiving computer unit 1 sends controls the hydraulic means 21 of stretch-draw instrument 2 and drives the steel strand 81 on jack 4 pairs of beam bodies 8 to carry out tension operation, and described controller 7 is connected with displacement transducer 3, pressure sensor 5, force snesor 6 and temperature pick up 26 respectively and the data information transfer gathered by described sensor is for further processing to computer unit 1.
As depicted in figs. 1 and 2, the oil suction chamber 41 of jack 4 of the present invention and oil back chamber 43 are connected with hydraulic valve block 213 through oil guide pipe; Force snesor 6 of the present invention is radial force snesor and is fixedly connected on cylinder barrel 42 base of jack 4 through screw, and the force value of this force snesor 6 can convert through calibration equation and calibrate.
As shown in Figure 3 and Figure 4, the stretch-draw instrument 2 of the present invention frequency converter that comprises hydraulic means 21, radiator fan 22, cooler 23, electrothermal tube 24, temperature pick up 26, variable-frequency motor 25 and be connected with controller 7; Described temperature pick up 26 and cooler 23, electrothermal tube 24 acting in conjunction, for the oil temperature of accurate hydraulic control oil, thus protection hydraulic oil and the application life for extending whole tensioning system; The stepper motor 216 that described hydraulic means 21 comprises oil pump unit 211, pressure meter 212, hydraulic valve block 213, cleaner 217, reversal valve 214, digital throttle 215 and is connected with digital throttle 215, described oil pump unit 211 is connected with fuel tank, the hydraulic oil for refluxing after filtering jack 4 pressure release on the oil return opening that described cleaner 217 is arranged on oil pump unit 211; Described reversal valve 214 and stepper motor 216 are connected with controller 7 respectively, and described stepper motor 216 is for controlling to adjust the flow of digital throttle 215; The force value that described pressure meter 212 is connected to also available pressure sensor 5 and/or force snesor 6 on hydraulic valve block 213 is checked; The hydraulic oil UNICOM of detecting head in the oil guiding hole and fuel tank of fuel tank sidewall of described temperature pick up 26, described controller 7 whether can exceed setting range to control startup electrothermal tube 24 according to surveyed oil temperature or cooler 23 regulates oil temperature automatically; Described controller 7 comprises and control treatment module 71 and the wireless receiving module 72 that is connected with control treatment module 71, and this wireless receiving module 72 adopts wireless transmission frequency and computer unit 1 exchange data information of 433MHz.
As shown in Figure 5 and Figure 6, jack 4 of the present invention and stretch-draw instrument 2 are more than two and arrange in pairs, tension operation can be carried out to the steel strand 81 at two ends on single hole beam body 8 when all arranging two simultaneously, tension operation can be carried out to the steel strand 81 at two ends on diplopore beam body 8 when all arranging four simultaneously, effectively raise production efficiency.
By reference to the accompanying drawings, operating principle of the present invention is: the two ends first jack 4 being connected to beam body 8, the oil-out of the oil pump unit 211 on stretch-draw instrument 2 by oil pipe respectively with reversal valve 214, the UNICOMs such as digital throttle 215 and hydraulic valve block 213, then switch on power start-up simulation machine unit 1, open the cable tensios control software in computer unit 1, corresponding work functions interface is selected according to engineering practice, the tension data that input is necessary, as engineering project information, stretch-draw component information, setting tension stress value, setting elongation etc., input complete after start stressing sequence, this Time Controller 7 can receive the control signal sent from computer unit 1, control starter motor 25, hydraulic oil in stretch-draw instrument 2 top tank flows into the oil suction chamber 41 of jack 4 through oil pump unit 211, reversal valve 214, digital throttle 215, hydraulic valve block 213, oil guide pipe and is ejected by piston rod 44 successively, carries out stretching construction, meanwhile pressure sensor 5 gathers the force value of jack 4 oil suction chamber 41, displacement transducer 3 gathers the stretch value of jack 4 piston rod 44, force snesor 6 gathers the stress value of steel strand 81 on jack tension beam body 8, temperature pick up 26 gathers the oil temperature of hydraulic oil, and in real time by data transfer to controller 7, feed back to computer unit 1 again the signal gathered is carried out to calculating with setting value and compares, control stretch-draw instrument 2 carries out stretch-draw operation in real time adjustment to jack 4, when computer unit 1 to gather signal calculate compare reach setting stress value and elongation time, the pressurize of a period of time is carried out in jack 4 stopping actions, when after the stretch-draw end of job, controller 7 can drive the oil return opening of reversal valve 214 UNICOM oil pump unit 211, makes the hydraulic oil in jack 4 be back in the fuel tank of stretch-draw instrument through oil guide pipe, hydraulic valve block 213, digital throttle 215, reversal valve 214, cleaner 217, cooler 23, can realize data intelligent process in stretch-draw operation process, stress value control accuracy during stretch-draw operation is ± 1.5%, and by contrasting can carry out duct friction test to steel strand 81 actual elongation value of displacement transducer 3 measurement and the deviation of theory calculate stretch value, described force snesor 6 is for more directly and exactly detecting stress value during jack 4 tension steel strand 81, and described pressure sensor 5 mainly plays check effect force snesor 6 being shown to data.
The prestressing force pull system that the present invention relates to may be used in the bridge of highway, railway, also may be used for other and relates to prestressing force part, the side slope place of such as railway or highway; When the prestressing force pull system that the present invention relates to is for bridge in railway, the beam body length direction of described bridge and the length direction of bridge are consistent, and the length of beam body is such as 24m or 32m; Present invention achieves and control the fast remote of bridge prestress tensioning system, such as the present invention uses wireless network to carry out Long-distance Control, and does not re-use GPRS transmission of the prior art, and the data transmission that medium-long range of the present invention is controlled can complete in 5 seconds.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations; Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a bridge prestress tensioning system, is characterized in that comprising computer unit (1), stretch-draw instrument (2), displacement transducer (3), jack (4), pressure sensor (5), force snesor (6) and controller (7), institute's displacement sensors (3) is arranged at cylinder barrel (42) outside of jack (4) and is connected the extension elongation for measuring piston rod (44) with piston rod (44), for measuring the force value of jack (4) oil suction chamber (41) interior hydraulic oil on cylinder barrel (42) inwall that described pressure sensor (5) is arranged on jack (4), cylinder barrel (42) base that described force snesor (6) is arranged at jack (4) is connected the stress value for measuring during jack (4) tension steel strand (81) with beam body (8), described stretch-draw instrument (2) comprise be arranged at fuel tank sidewall temperature pick up (26) for measuring the temperature of hydraulic oil, the signal that described controller (7) energy receiving computer unit (1) sends is to control the hydraulic means (21) of stretch-draw instrument (2) and to drive jack (4) to carry out tension operation to the steel strand (81) on beam body (8), described controller (7) respectively with displacement transducer (3), pressure sensor (5), force snesor (6) is connected with temperature pick up (26) and the data information transfer gathered by described sensor is for further processing to computer unit (1).
2. a kind of bridge prestress tensioning system according to claim 1, is characterized in that the frequency converter that described stretch-draw instrument (2) comprises hydraulic means (21), radiator fan (22), cooler (23), electrothermal tube (24), temperature pick up (26), variable-frequency motor (25) and is connected with controller (7).
3. a kind of bridge prestress tensioning system according to claim 2, it is characterized in that described hydraulic means (21) comprises oil pump unit (211), pressure meter (212), hydraulic valve block (213), cleaner (217), reversal valve (214), digital throttle (215) and the stepper motor (216) be connected with digital throttle (215), described oil pump unit (211) is connected with fuel tank, hydraulic oil for refluxing after filtering jack (4) pressure release on the oil return opening that described cleaner (217) is connected to oil pump unit (211).
4. a kind of bridge prestress tensioning system according to claim 3, it is characterized in that described reversal valve (214) and stepper motor (216) are connected with controller (7) respectively, described stepper motor (216) is for controlling to adjust the flow of digital throttle (215).
5. a kind of bridge prestress tensioning system according to claim 3, is characterized in that described pressure meter (212) is connected to upper and available pressure sensor (5) and/or force snesor (6) force value of hydraulic valve block (213) and checks.
6. a kind of bridge prestress tensioning system according to claim 1, it is characterized in that the hydraulic oil UNICOM of the detecting head of described temperature pick up (26) in the oil guiding hole and fuel tank of fuel tank sidewall, described controller (7) can according to temperature pick up (26) survey oil temperature whether exceed setting range to control start electrothermal tube (24) or cooler (23) automatically regulate oil temperature.
7. a kind of bridge prestress tensioning system according to claim 1, it is characterized in that the wireless receiving module (72) that described controller (7) comprises control treatment module (71) and is connected with control treatment module (71), this wireless receiving module (72) adopts wireless transmission frequency and computer unit (1) exchange data information of 433MHz.
8. a kind of bridge prestress tensioning system according to claim 1, it is characterized in that described force snesor (6) is fixedly connected on cylinder barrel (42) base of jack (4) for radial force snesor through screw, this force snesor (6) adopts calibration equation to convert and calibrates.
9. a kind of bridge prestress tensioning system according to claim 1, is characterized in that the oil suction chamber (41) of described jack (4) and oil back chamber (43) are connected with hydraulic valve block (213) through oil guide pipe.
10. a kind of bridge prestress tensioning system according to claim 1 ~ 9 any one, it is characterized in that described jack (4) and stretch-draw instrument (2) are more than two and arrange in pairs, tension operation can be carried out to the steel strand (81) at the upper two ends of single hole beam body (8) when all arranging two simultaneously, when all arranging four, tension operation can be carried out to the steel strand (81) at the upper two ends of diplopore beam body (8) simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583164.6A CN105113417A (en) | 2015-09-14 | 2015-09-14 | Bridge prestress tensioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583164.6A CN105113417A (en) | 2015-09-14 | 2015-09-14 | Bridge prestress tensioning system |
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| CN105113417A true CN105113417A (en) | 2015-12-02 |
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| CN201510583164.6A Pending CN105113417A (en) | 2015-09-14 | 2015-09-14 | Bridge prestress tensioning system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887683A (en) * | 2016-04-11 | 2016-08-24 | 长安大学 | Prestressed tensioning system |
| CN107436132A (en) * | 2017-08-28 | 2017-12-05 | 江苏开通建设工程有限公司 | With the device and method of flow sensor measurement deformed bar stretching extension value |
| CN110788987A (en) * | 2019-10-28 | 2020-02-14 | 陶汉成 | Automatic tensioning equipment for prestressed pipe pile |
| CN112014310A (en) * | 2020-09-07 | 2020-12-01 | 广西大学 | Prestressed pipeline friction loss test and calculation method |
| CN113733343A (en) * | 2021-11-04 | 2021-12-03 | 中铁九局集团第三建设有限公司 | All-round stretch-draw monitoring auxiliary system of pretensioning track board production line |
-
2015
- 2015-09-14 CN CN201510583164.6A patent/CN105113417A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887683A (en) * | 2016-04-11 | 2016-08-24 | 长安大学 | Prestressed tensioning system |
| CN107436132A (en) * | 2017-08-28 | 2017-12-05 | 江苏开通建设工程有限公司 | With the device and method of flow sensor measurement deformed bar stretching extension value |
| CN110788987A (en) * | 2019-10-28 | 2020-02-14 | 陶汉成 | Automatic tensioning equipment for prestressed pipe pile |
| CN110788987B (en) * | 2019-10-28 | 2021-03-02 | 苏州艾思欧新型复合材料有限公司 | Automatic tensioning equipment for prestressed pipe pile |
| CN112014310A (en) * | 2020-09-07 | 2020-12-01 | 广西大学 | Prestressed pipeline friction loss test and calculation method |
| CN113733343A (en) * | 2021-11-04 | 2021-12-03 | 中铁九局集团第三建设有限公司 | All-round stretch-draw monitoring auxiliary system of pretensioning track board production line |
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Application publication date: 20151202 |
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