CN108894115A - A kind of pylon based on laser range sensor adjusts cable system automatically - Google Patents
A kind of pylon based on laser range sensor adjusts cable system automatically Download PDFInfo
- Publication number
- CN108894115A CN108894115A CN201810766395.4A CN201810766395A CN108894115A CN 108894115 A CN108894115 A CN 108894115A CN 201810766395 A CN201810766395 A CN 201810766395A CN 108894115 A CN108894115 A CN 108894115A
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- China
- Prior art keywords
- pylon
- laser range
- range sensor
- jack
- setting value
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
Abstract
The present invention provides a kind of pylons based on laser range sensor to adjust cable system automatically, it includes laser range sensor, its data information for being suitable for real-time dynamic acquisition pylon offset distance, and the data information is sent to monitoring center, monitoring center receives the data information, union processing is stored, compared with preset pylon offset threshold；Control centre, it connect with monitoring center's signal, when pylon offset distance is greater than the pylon offset threshold, the control centre receives signal, pumping station system is controlled to open, it adjusts the oil inlet oil circuit of rope jack to open, rope jack fuel feeding is adjusted to carry out tensioning to steel strand wires, until amendment pylon offset.The technical solution can dynamic acquisition pylon offset distance in real time data information, and tensioning amendment pylon offset is carried out to steel strand wires automatically.
Description
Technical field
The present invention relates to a kind of pylons to deviate dynamic observation system, especially a kind of tower based on laser range sensor
Frame adjusts cable system automatically.
Background technique
After founding of New, with the rapid development of bridge construction cause, a large amount of arch bridge has been built successively.Concrete
Arch bridge is applied to earliest among the railroad bridge construction in China, the bridge of rich Sha County Yongdinghe River 7 of the main span 150m built for 1966
It is the concrete arch-type bridge of largest domestic span at that time.China is concentrated mainly on construction method for the research of concrete arch-type bridge
Optimization aspect.With non-support cable crane system method, limited bracket construction method, cantilever-construction, construction by swing, Synchronous lifting
The successive appearance of the construction methods such as method, stiff skeleton construction method, concrete arch-type bridge have welcome the spring of development.2007, China
Concrete arch-type bridge --- the white sand ditch 1# bridge of 150m has been built up using Hanging Basket cantilever pouring technology for the first time.However, using Hanging Basket
When cantilever pouring construction method pours arch ring concrete, the dynamic measurement of pylon offset and correction, knotted rope (anchor cable) are continuous pre-
It is tightly construction Difficulties and priority control technique.Do not had using common construction method practical to pylon offset and each Suo Li
The automatic collection of the data such as stress, entirely with manual control, error is big, and risk is high.
When general concrete Arch Bridge Construction arch ring is poured, the offset of pylon is all by total station or GPS positioning system
System assists rectifying a deviation using the Suo Li, jack stroke, cable wind rope that manually adjust knotted rope and anchor cable, the preceding card of work progress
Then knotted rope and the single preload of anchor cable steel strand wires are integrally adjusted rope with large-tonnage jack, need to meet arch ring simultaneously by formula jack
Linear and pylon is stablized, and mainly by artificial observation and record, the method defect is as follows：
1) husky top grand bridge arch ring is constructed using Hanging Basket cantilever pouring, in concreting process, due to concrete weight
The increase of amount, pylon can be tilted along axis into bridge, if monitoring is improper with observation measures, pylon has unstability risk, be made
At serious safe mass accident.
2) since the steel strand wires that knotted rope (anchor cable) uses use the single preload of preceding clip type jack, jack stroke is short, by
It is many and longer in steel strand wires, it needs to carry out jack repeatedly to fall to open, preload can be met, labor intensity is big, effect
Rate is low, high altitude operation, increases security risk, since successively to pre-tighten stress inconsistent for each steel strand wires when single preload, steel is caused to twist
Line discontinuity, practical not to be able to satisfy the identical pretightning force of each steel strand wires, there are risks in anchoring procedure.
3) construction period is long, construction efficiency is low.
Summary of the invention
It is an object of that present invention to provide it is a kind of can dynamic acquisition pylon offset distance in real time data information, and it is automatic
A kind of pylon based on laser range sensor for carrying out tensioning amendment pylon offset to steel strand wires adjusts cable system automatically.
Technical solution of the present invention is：A kind of pylon based on laser range sensor adjusts cable system automatically comprising：
Laser range sensor is suitable for the data information of real-time dynamic acquisition pylon offset distance, and by the number
It is believed that breath is sent to monitoring center, monitoring center receives the data information, and storage union processing is inclined with preset pylon
Threshold value is moved to compare；
Control centre connect with monitoring center's signal, deviates threshold when pylon offset distance is greater than the pylon
When value, the control centre receives signal, and control pumping station system is opened, and adjusts the oil inlet oil circuit of rope jack to open, adjusts rope very heavy
It pushes up fuel feeding and tensioning is carried out to steel strand wires, until amendment pylon offset.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein the Laser Measuring
It is set to the side of pylon column away from sensor, will be seen that pylon column described in laser directive by emitting camera lens, by described
The laser beam of pylon column reflection is received by reception camera lens by PSD element, and is handled by analogy and digital circuit,
Microprocessor analysis calculates pylon offset output valve.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein described in each
Laser range sensor respectively respectively corresponds a number, and is connect by wireless data transmission mode with the monitoring center.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein the Laser Measuring
Information data is sent to the monitoring center away from sensor, monitoring center outputting standard analog signals in proportion, and
Measured distance can be read in the analog quantity window of setting.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein the tune Suo Qian
Jin top includes stretch-draw jack；
The monitoring center includes PLC control unit, analogue collection module and wireless transport module, the PLC control
Unit controls the analogue collection module and is subject to calculation process according to collected information data, exports stretching force setting value
Or displacement setting value, the control centre issue instruction, control institute according to the stretching force setting value or displacement setting value of input
Pumping station system unlatching is stated, the oil inlet oil circuit of stretch-draw jack is opened, and stretch-draw jack fuel feeding carries out tensioning to steel strand wires, until
Steel twisted-line tension-force or displacement reach the stretching force setting value or the displacement setting value.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein the tune Suo Qian
Jin top further includes pretightening jack；PLC control unit output further includes pretightning force setting value, the control centre according to
The pretightning force setting value of input, issue corresponding instruction, control the pretightening jack carry out pre-tighten work to steel strand wires reach institute
Pretightning force setting value is stated, and controls the pretightening jack oil inlet oil circuit simultaneously and closes, the stretch-draw jack oil inlet oil circuit
It opens, until steel twisted-line tension-force or displacement reach the stretching force setting value or the displacement setting value.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein in the control
The heart is suitable for instruction separate unit or the more pumping station system synchronous workings.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein the pumping plant system
System includes fuel tank, control valve group and pressure sensor, and the control valve group includes valve body, solenoid directional control valve, automatically controlled overflow valve,
Oil inlet, oil return opening are provided in the control valve group, each oil inlet and oil return opening are separately equipped with the electromagnetic switch
Valve；The pressure sensor and the automatically controlled overflow valve are arranged on oil inlet oil circuit.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein when a certain steel
When twisted wire pretightning force reaches pretightning force setting value, pressure information is transferred to control centre by pressure sensor, and control centre issues
Instruction, automatically controlled overflow valve starting, pretightening jack can not be pressurized again, and the cylinder piston of the pretightening jack stops working, remaining
The corresponding pretightening jack of steel strand wires for not reaching preload setting power works on, until all steel strand wires reach pretightning force
Setting value, overall control center issue instruction, and electromagnetic switch valve events stop to pretightening jack fuel feeding.
Preferably, a kind of above-mentioned pylon based on laser range sensor adjusts cable system automatically, wherein the tensioning thousand
After one stroke of tensioning of jin top, if pressure and/or displacement do not reach setting value, then automated backhaul carries out of next stroke
It draws.
The present invention having the beneficial effect that compared with the prior art：The technical solution can automatic dynamic acquire in real time pylon reality
Hour offset is more than the offset threshold set apart from and when deviation, and control centre receives signal, controls pumping station system and opens automatically
It opens, adjusts the oil inlet oil circuit of rope jack to open, rope jack fuel feeding is adjusted to carry out tensioning automatically to steel strand wires, until amendment pylon
Offset, specifically, pumping plant provides power source to jack, configuration automated tool anchor has the function of continuously to adjust rope (tensioning), control
System processed can instruct to separate unit or more pumping plant synchronous workings, cable system can be adjusted to combine same with automatic offset monitoring system
One operating platform realizes the real-time acquisition of pylon offset data and storage, related data can be transferred to office system by network
System is observed in real time.
Data show, steel strand wires pre-tighten speed automatically and can reach 16m/ hours the program in actual operation.
Detailed description of the invention
It, below will be to tool in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Body embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing be some embodiments of the present invention, for those of ordinary skill in the art, what is do not made the creative labor
Under the premise of, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is that the embodiment of the present invention uses laser sensor to read schematic diagram to pylon yaw displacement；
Fig. 2 is automatic tune Cable Structure schematic diagram.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described reality
Applying example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to what the present invention protected
Range.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, can be understood with concrete condition above-mentioned
The concrete meaning of term in the present invention.
As depicted in figs. 1 and 2, a kind of pylon based on laser range sensor adjusts cable system automatically comprising：
Laser range sensor 6 is suitable for the data information of real-time 10 offset distance of dynamic acquisition pylon, and will be described
Data information is sent to monitoring center, and monitoring center receives the data information, storage union processing, with preset pylon
Offset threshold compares；
Control centre 1 connect with monitoring center's signal, when 10 offset distance of pylon is deviated greater than the pylon
When threshold value, the control centre 1 receives signal, and control pumping station system 2 is opened, and the oil inlet oil circuit of rope jack (3,4) is adjusted to open
It opens, rope jack (3,4) fuel feeding is adjusted to carry out tensioning to steel strand wires 5, until amendment pylon offset.
The laser range sensor 6 is set to the side of pylon column, by transmitting camera lens 7 it will be seen that laser directive institute
Pylon column 10 is stated, is received by reception camera lens 8 by PSD element 9 by the laser beam that the pylon column 10 reflects,
And handled by analogy and digital circuit, microprocessor analysis, calculate pylon offset output valve.
Laser range sensor 6 is designed with the light velocity based on optical triangulation principle.Transmitter passes through camera lens
It will be seen that laser homed on its target object, by the laser beam that object emits, by receiving camera lens, (position detection is filled by PSD
Set) element reception.Distance from receiver to measured object determines that light beam reaches the angle of receiving element.This angle determines
Light beam falls in the position on PSD receiving element.Light beam is handled in the position of PSD receiving element by analogy and digital circuit,
And pass through microprocessor analysis, corresponding output valve is calculated, and in the analog quantity window of pylon setting, export in proportion
Master die analog quantity signal, can read measured distance.
Each described laser range sensor 6 respectively respectively corresponds a number, and by wireless data transmission mode with
Monitoring center's connection.
Information data is sent to the monitoring center by the laser range sensor 6, and the monitoring center is defeated in proportion
Master die analog quantity signal out, and measured distance can be read in the analog quantity window of setting.
The tune rope jack (3,4) includes stretch-draw jack 3；
The monitoring center includes PLC control unit, analogue collection module and wireless transport module, the PLC control
Unit controls the analogue collection module and is subject to calculation process according to collected information data, exports stretching force setting value
Or displacement setting value, the control centre issue instruction, control institute according to the stretching force setting value or displacement setting value of input
The unlatching of pumping station system 2 is stated, the oil inlet oil circuit of stretch-draw jack 3 is opened, and stretch-draw jack fuel feeding carries out tensioning to steel strand wires 5,
Until 5 stretching force of steel strand wires or displacement reach the stretching force setting value or the displacement setting value.
The tune rope jack (3,4) further includes pretightening jack 4；The PLC control unit output further includes pretightning force
Setting value, the control centre issue corresponding instruction according to the pretightning force setting value of input, control the pretightening jack 4 into
Row pre-tightens work to steel strand wires 5 and reaches the pretightning force setting value, and controls the 4 oil inlet oil circuit of pretightening jack simultaneously and close
Close, the 3 oil inlet oil circuit of stretch-draw jack is opened, until 5 stretching force of steel strand wires or displacement reach the stretching force setting value or
The displacement setting value.
The control centre 1 is suitable for instruction separate unit or the more pumping station systems 2 work asynchronously.
The pumping station system 2 includes fuel tank, control valve group and pressure sensor, and the control valve group includes valve body, electromagnetism
Reversal valve, automatically controlled overflow valve are provided with oil inlet, oil return opening in the control valve group, and each oil inlet and oil return opening are matched respectively
If a solenoid directional control valve；The pressure sensor and the automatically controlled overflow valve are arranged on oil inlet oil circuit.
When a certain 5 pretightning force of steel strand wires reaches pretightning force setting value, pressure information is transferred to control by pressure sensor
Center processed, control centre issue instruction, automatically controlled overflow valve starting, and pretightening jack can not be pressurized again, the pretightening jack 4
Cylinder piston stops working, remaining corresponding pretightening jack of steel strand wires for not reaching preload setting power works on, until institute
There are steel strand wires to reach pretightning force setting value, overall control center issues instruction, and electromagnetic switch valve events stop to pretightening jack
Fuel feeding.
It is if pressure and/or displacement do not reach setting value, then automatic to return after 3 tensioning of stretch-draw jack, one stroke
The tensioning of the next stroke of Cheng Jinhang.
The technical solution can automatic dynamic acquire in real time pylon real time offset distance and also when deviation be more than setting offset
Threshold value, control centre receive signal, and control pumping station system automatically turns on, and adjust the oil inlet oil circuit of rope jack to open, adjust rope very heavy
Top fuel feeding carries out tensioning to steel strand wires automatically, until amendment pylon offset is matched specifically, pumping plant provides power source to jack
Setting automated tool anchor has the function of continuously to adjust rope (tensioning), and control system can instruct to separate unit or more pumping plant synchronous workings,
Cable system can be adjusted to combine in same operating platform with automatic offset monitoring system, realize the real-time acquisition of pylon offset data
And store, related data can be transferred to office system by network and be observed in real time.
Data show, steel strand wires pre-tighten speed automatically and can reach 16m/ hours the program in actual operation.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；
Although present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that：Its
It is still possible to modify the technical solutions described in the foregoing embodiments, or special to some or all of technologies
Sign is equivalently replaced；And these are modified or replaceed, the present invention that it does not separate the essence of the corresponding technical solution is each to be implemented
The range of example technical solution.
Claims (10)
1. a kind of pylon based on laser range sensor adjusts cable system automatically, which is characterized in that including：
Laser range sensor is suitable for the data information of real-time dynamic acquisition pylon offset distance, and by the data information
It is sent to monitoring center, monitoring center receives the data information, storage union processing, with preset pylon offset threshold phase
Compare；
Control centre connect with monitoring center's signal, when pylon offset distance is greater than the pylon offset threshold,
The control centre receives signal, and control pumping station system is opened, and adjusts the oil inlet oil circuit of rope jack to open, adjusts rope jack fuel feeding
Tensioning is carried out to steel strand wires, until amendment pylon offset.
2. a kind of pylon based on laser range sensor according to claim 1 adjusts cable system automatically, which is characterized in that
The laser range sensor is set to the side of pylon column, will be seen that pylon described in laser directive is vertical by emitting camera lens
Column is received, and by analog- and digital- by the laser beam that the pylon column reflects by receiving camera lens by PSD element
Processing of circuit, microprocessor analysis calculate pylon offset output valve.
3. a kind of pylon based on laser range sensor according to claim 1 adjusts cable system automatically, which is characterized in that
Each described laser range sensor respectively respectively corresponds a number, and by wireless data transmission mode and the monitoring
Heart connection.
4. a kind of pylon based on laser range sensor according to claim 1 adjusts cable system automatically, which is characterized in that
Information data is sent to the monitoring center by the laser range sensor, and outputting standard is simulated in proportion for the monitoring center
Signal is measured, and measured distance can be read in the analog quantity window of setting.
5. a kind of pylon based on laser range sensor according to claim 1 adjusts cable system automatically, which is characterized in that
The tune rope jack includes stretch-draw jack；
The monitoring center includes PLC control unit, analogue collection module and wireless transport module, the PLC control unit
It controls the analogue collection module and calculation process is subject to according to collected information data, export stretching force setting value or displacement
Setting value, the control centre issue instruction, control the pumping plant system according to the stretching force setting value or displacement setting value of input
System is opened, and the oil inlet oil circuit of stretch-draw jack is opened, and stretch-draw jack fuel feeding carries out tensioning to steel strand wires, until steel strand tension
Power or displacement reach the stretching force setting value or the displacement setting value.
6. adjusting cable system automatically according to a kind of pylon based on laser range sensor that claim 5 is stated, which is characterized in that institute
Stating and adjusting rope jack further includes pretightening jack；PLC control unit output further includes pretightning force setting value, in the control
The heart issues corresponding instruction according to the pretightning force setting value of input, controls the pretightening jack and pre-tighten work to steel strand wires
Reach the pretightning force setting value, and controls the pretightening jack oil inlet oil circuit simultaneously and close, the stretch-draw jack oil inlet
Oil circuit is opened, until steel twisted-line tension-force or displacement reach the stretching force setting value or the displacement setting value.
7. a kind of pylon based on laser range sensor according to claim 5 or 6 adjusts cable system automatically, feature exists
In the control centre is suitable for instruction separate unit or the more pumping station system synchronous workings.
8. a kind of pylon based on laser range sensor according to claim 6 adjusts cable system automatically, which is characterized in that
The pumping station system includes fuel tank, control valve group and pressure sensor, and the control valve group includes valve body, solenoid directional control valve, electricity
Overflow valve is controlled, is provided with oil inlet, oil return opening in the control valve group, each oil inlet and oil return opening are separately equipped with described in one
Solenoid directional control valve；The pressure sensor and the automatically controlled overflow valve are arranged on oil inlet oil circuit.
9. a kind of pylon based on laser range sensor according to claim 8 adjusts cable system automatically, when a certain steel
When twisted wire pretightning force reaches pretightning force setting value, pressure information is transferred to control centre by pressure sensor, and control centre issues
Instruction, automatically controlled overflow valve starting, pretightening jack can not be pressurized again, and the cylinder piston of the pretightening jack stops working, remaining
The corresponding pretightening jack of steel strand wires for not reaching preload setting power works on, until all steel strand wires reach pretightning force and set
Definite value, overall control center issue instruction, and electromagnetic switch valve events stop to pretightening jack fuel feeding.
10. a kind of pylon based on laser range sensor according to claim 8 adjusts cable system automatically, feature exists
In after one stroke of the stretch-draw jack tensioning, if pressure and/or displacement do not reach setting value, then automated backhaul is carried out
The tensioning of next stroke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810766395.4A CN108894115A (en) | 2018-07-12 | 2018-07-12 | A kind of pylon based on laser range sensor adjusts cable system automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810766395.4A CN108894115A (en) | 2018-07-12 | 2018-07-12 | A kind of pylon based on laser range sensor adjusts cable system automatically |
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| Publication Number | Publication Date |
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| CN108894115A true CN108894115A (en) | 2018-11-27 |
Family
ID=64349371
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810766395.4A Pending CN108894115A (en) | 2018-07-12 | 2018-07-12 | A kind of pylon based on laser range sensor adjusts cable system automatically |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111708064A (en) * | 2020-06-19 | 2020-09-25 | 中铁建大桥工程局集团南方工程有限公司 | Steel truss bridge construction elevation regulation and control method based on Beidou carrier differential positioning |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000064227A (en) * | 1998-08-27 | 2000-02-29 | Sumitomo Constr Co Ltd | Bridge erection method |
| CN103526948A (en) * | 2013-10-24 | 2014-01-22 | 柳州黔桥工程材料有限公司 | Control method of intelligent tension system and intelligent tension system |
| CN106285013A (en) * | 2016-10-18 | 2017-01-04 | 柳州黔桥工程材料有限公司 | Steel strand wires group's anchor monoblock type automatic synchronization control method |
| CN108239937A (en) * | 2017-09-14 | 2018-07-03 | 贵州桥梁建设集团有限责任公司 | Arch bridge tower frame self-balance control method |
-
2018
- 2018-07-12 CN CN201810766395.4A patent/CN108894115A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000064227A (en) * | 1998-08-27 | 2000-02-29 | Sumitomo Constr Co Ltd | Bridge erection method |
| CN103526948A (en) * | 2013-10-24 | 2014-01-22 | 柳州黔桥工程材料有限公司 | Control method of intelligent tension system and intelligent tension system |
| CN106285013A (en) * | 2016-10-18 | 2017-01-04 | 柳州黔桥工程材料有限公司 | Steel strand wires group's anchor monoblock type automatic synchronization control method |
| CN108239937A (en) * | 2017-09-14 | 2018-07-03 | 贵州桥梁建设集团有限责任公司 | Arch bridge tower frame self-balance control method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111708064A (en) * | 2020-06-19 | 2020-09-25 | 中铁建大桥工程局集团南方工程有限公司 | Steel truss bridge construction elevation regulation and control method based on Beidou carrier differential positioning |
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Application publication date: 20181127 |
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