CN106592429A - Suspension bridge main cable anti-corrosion device and method - Google Patents
Suspension bridge main cable anti-corrosion device and method Download PDFInfo
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- CN106592429A CN106592429A CN201611169062.0A CN201611169062A CN106592429A CN 106592429 A CN106592429 A CN 106592429A CN 201611169062 A CN201611169062 A CN 201611169062A CN 106592429 A CN106592429 A CN 106592429A
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- nitrogen
- gas
- main push
- towing rope
- air inlet
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
Abstract
The invention discloses a suspension bridge main cable anti-corrosion device and method. The device includes a gas incoming clamp, gas discharging clamps, a dehumidification and nitrogen generation device and an automatic control system, wherein the gas incoming clamp and the gas discharging clamps sleeve a sealed main cable; temperature and humidity sensors are installed in the gas incoming clamp and the gas discharging clamps; the temperature and humidity sensors are connected with the automatic control system; the gas inlet of the gas incoming clamp is provided with a normally open type solenoid valve; the gas outlets of the gas discharging clamps are provided with normally closed solenoid valves; the normally open type solenoid valve and the normally closed solenoid valves are connected with the automatic control system; the dehumidification and nitrogen generation device includes a dehumidification unit and a nitrogen generation unit; the gas outlets of the dehumidification unit and the nitrogen generation unit are connected in parallel with a three-way control valve and then are connected with the gas inlet of the gas incoming clamp; and the dehumidification unit and the nitrogen generation unit are connected with the automatic control system. The suspension bridge main cable anti-corrosion device can monitor humidity and oxygen content of the internal space of the main cable and automatically select the operation mode of the dehumidification and nitrogen generation device so as to make the purity of nitrogen filling the main cable higher than 99%, and therefore, the service life of a bridge can be greatly prolonged.
Description
Technical field
The present invention relates to a kind of main rope of suspension bridge erosion protection system and method, belong to bridge life-cycle protection technology field.
Background technology
Main push-towing rope is the life line of suspension bridge, is made up of multi beam steel tendon, and steel tendon is by multiply high-strength galvanized steel wire group
Into.Because suspension bridge use environment is severe, mostly hot humid environment is the service life for ensureing bridge, and the corrosion of main push-towing rope is prevented
Shield is particularly important.The corrosion rate of main push-towing rope is determined have by the environment residing for it with the presence of humidity, temperature and hazardous medium
Close.Such as：Used as deciding factor, when the relative humidity of air is below 60%, the corrosion of main push-towing rope is very slight to humidity；But
When relative humidity increases to a certain numerical value, the corrosion rate of main push-towing rope will be raised suddenly, and this numerical value is referred to as critical humidity.When
In normal temperature environment, in the presence of moisture in an atmosphere, oxygen and other pollutant, there is electrochemical corrosion in main push-towing rope steel wire, i.e.,
There is chemical reaction and be changed into rust in the water, oxygen in the anode of steel wire composition galvanic element, with air, rust can absorb a large amount of water
Point, cause rusty scale volumetric expansion to make corrosion continue to expand to inside；When in hot environment, main push-towing rope steel wire can occur chemical corruption
After erosion, i.e. metal and dry air contact, surface can generate the compounds such as chloride, sulfide, oxide, so as to be formed to steel
The chemical attack of silk, and the moisture film of Steel Wire Surface is also the principal element for accelerating this process.
In prior art, come real by the way of control inner air relative humidity more than the erosion protection system of main rope of suspension bridge
Existing anti-corrosion protection purpose, avoids being caused in Steel Wire Surface formation moisture film by the content for constantly removing water vapor in air
Steel wire corrodes.This kind of method has certain effect for the corrosion rate for slowing down main push-towing rope, but with the increase of bridge service phase, it is main
The corrosion rate of cable also can gradually increase, and not only shorten the life-span of bridge, and for the safety of whole bridge also constitutes prestige
The side of body.Also, traditional bridge dehumidifying anti-corrosion method does not have realization and automatically controls, shape of the dehumidification system in continuous operation
State, causes the energy and greatly wastes.
In sum, dehumidify the weak point of anti-corrosion method for above main push-towing rope, if can have a kind of device can be from root
The etching problem of main rope of suspension bridge is solved in sheet, can be realized by using automatic control system again, by with great research
Meaning.
The content of the invention
For above-mentioned existing technical problem, the present invention provides a kind of main rope of suspension bridge erosion protection system and method, utilizes
Automatic control system is higher than to provide a nitrogen gas purity inside main push-towing rope realizing dehumidifying and the automatic switchover of two kinds of functions of nitrogen processed
99% environment for not occurring to corrode, fundamentally to solve the etching problem of main rope of suspension bridge.
For achieving the above object, the present invention provides a kind of main rope of suspension bridge erosion protection system, including being sleeved on main push-towing rope
Air inlet folder and exhaust clip, dehumidify the equipment of making nitrogen, and the automatic control system for being provided with PLC；
Temperature Humidity Sensor is separately installed with described inlet and outlet folder, each Temperature Humidity Sensor is communicated respectively by RS485
Line connects the PLC serial ports of automatic control system；
Normally open type magnetic valve is provided with the air inlet of described air inlet folder, the exhaust ports of exhaust clip are provided with normally closed solenoid valve,
And normally opened, normally closed solenoid valve connects the PLC outfans of automatic control system by the control end of A.C. contactor respectively；
The described dehumidifying equipment of making nitrogen includes Dehumidifying element and nitrogen unit processed, and both air vents are connected in parallel to after three-way control valve,
The air inlet pressed from both sides with air inlet by pipeline is connected, and both connect automatic control system by the control end of A.C. contactor respectively
PLC outfans.
Further, described Dehumidifying element is mainly sequentially connected by rotary dehumidifier, booster fan and is constituted.
Further, described nitrogen unit processed mainly by air compressor, cooling driers, air cleaning facility, nitrogen making machine successively
Connection composition.Further, the air vent of described nitrogen making machine carries pressure-regulating valve door, and the outlet pressure of nitrogen making machine is 0.1-
0.6MPa, the gas pressure of pressure-regulating valve door is adjusted to 4-6KPa.
Further, described main push-towing rope is sealed by the way of be wrapped band or fluid sealant.
The present invention provides a kind of anti-corrosion method of said apparatus again, comprises the following specific steps that：
（One）Using relative humidity and oxygen content in Temperature Humidity Sensor real-time monitoring inlet and outlet folder, arrange when each is detected
During peak >=45% of the relative humidity in gas folder, automatic control system opens Dehumidifying element, and normally closed solenoid valve is powered,
Exhaust clip is opened；The dry gas that now Dehumidifying element is produced enter main push-towing rope space by air inlet folder, while former in main push-towing rope space
Some gas is discharged by exhaust clip；
（Two）In Dehumidifying element running, when the peak ＜ 45% of the relative humidity in each exhaust clip is detected, from
Autocontrol system closes Dehumidifying element, and opens nitrogen unit processed, and normally closed solenoid valve is remained powered on, and exhaust clip is stayed open；
Nitrogen of the purity that now nitrogen unit processed is produced higher than 99% enters main push-towing rope space by air inlet folder, while original in main push-towing rope space
Gas continue through exhaust clip discharge；
（Three）In nitrogen unit running processed, when the peak ＜ 1% of the oxygen content in each exhaust clip is detected, automatically
Control system closes nitrogen unit processed, and normally closed solenoid valve power-off, aerofluxuss clip closure；Nitrogen gas purity is now flooded with inside main push-towing rope high
In 99% dry gas, and it is isolated with outside air.
Main rope of suspension bridge erosion protection system of the present invention utilizes Automatic Control Theory, by the temperature in inlet and outlet folder
Humidity sensor is monitored in real time to the humidity and oxygen content of main push-towing rope inner space, and by the data is activation for collecting to
Automatic control system is processed and fed back, so as to automatically select the operational mode of the dehumidifying equipment of making nitrogen.When main push-towing rope space it is relative
During peak >=45% of humidity, automatic control system selects Dehumidifying element operational mode；When the highest of main push-towing rope space relative humidity
During value ＜ 45%, automatic control system automatically switches to nitrogen unit operational mode processed；As the peak ＜ 1% of main push-towing rope space oxygen content
When, automatic control system nitrogen unit processed out of service, and exhaust clip is closed, and make because air inlet folder is connected with the dehumidifying equipment of making nitrogen
The stable gas pressure of air inlet is obtained, so as to ensure that main push-towing rope interior volume completely cuts off with outside air, gas pressure is constant, maintain one not
There is the environment of corrosion.
In sum, present invention is mainly applied on bridge, different from traditional air dehumidification method, introducing is automatically controlled
System, makes the moisture in the air being passed through in main push-towing rope be removed completely, and oxygen content falls below 1%, and with drying, clean
High nitrogen substitutes the raw-gas in main push-towing rope space, is that bridge cable steel construction creates a ring that corrosion reaction cannot occur
Border, fundamentally solves the problems, such as that bridge cable steel construction occurs electrochemical corrosion, is a kind of long-acting bridge anti-corrosion method.
In traditional bridge dehumidifying Corrosion prevention scheme, due to the conveying gas capacity of dehumidification system it is limited, air inlet folder, exhaust clip
Mounting distance is greatly increased than comparatively dense, not only cost, and installation is wasted time and energy, and the effect on moisture extraction overall for cable also has necessarily
Impact.Compared to prior art, the invention has the advantages that：
1st, reducing the mounting distance of the packing density of air inlet folder, exhaust clip, air inlet folder and exhaust clip can be prolonged by original 200 meters
Grow to more than 2000 meters so that the gas fed distance inside main push-towing rope is greatly prolonged, and so as to save the energy, reduces cost,
Improve arrangement efficiency.
2nd, can real-time monitoring according to the humidity and oxygen content of main push-towing rope inner space, and automatically select the dehumidifying equipment of making nitrogen
Operational mode, realizes the automatic switchover of dehumidifying and two kinds of functions of nitrogen processed, simplifies artificial operation, improves main push-towing rope internal gas
The accuracy of quality control.
When dry gas of the nitrogen gas purity higher than 99% the 3rd, can be flooded with inside main push-towing rope, by controlling normally opened, normally closed type
Electromagnetic valve and form closed environment, and keep the gas pressure inside main push-towing rope, fundamentally prevent the corrosion of main push-towing rope, greatly prolong
Life-span of bridge.
Description of the drawings
Fig. 1 is the general arrangement of apparatus of the present invention；
Fig. 2 is the control principle drawing of the inventive method；
In figure：1st, air inlet folder, 2, exhaust clip, 3, conveyance conduit, 4, entablature, 5, the dehumidifying equipment of making nitrogen, 61, two end bays one,
62nd, two end bay two, 7, in across.
Specific embodiment
With reference to embodiment and accompanying drawing, the invention will be further described, but does not constitute the concrete restriction to the present invention.
As shown in Fig. 2 apparatus of the present invention include the air inlet folder 1 being sleeved on main push-towing rope and exhaust clip 2, dehumidify the equipment of making nitrogen 6,
And it is provided with the automatic control system of PLC.
Wherein：Temperature Humidity Sensor is separately installed with inlet and outlet folder 1,2, each Temperature Humidity Sensor passes through respectively
RS485 connections connect the PLC serial ports of automatic control system.Wherein, air inlet folder 1 at Temperature Humidity Sensor predominantly detect it is right
As if the relative humidity and oxygen content of the gas in feeding main push-towing rope space, the workability of Dehumidifying element and nitrogen unit processed can be reflected
Can, reference is provided for staff, it is easy to follow-up maintenance.Temperature Humidity Sensor predominantly detects pair as if main push-towing rope at exhaust clip 2
The relative humidity and oxygen content of the gas of inner space, is also this device parameter index to be controlled.
Normally open type magnetic valve is provided with the air inlet of air inlet folder 1, the exhaust ports of exhaust clip 2 are provided with normally closed solenoid valve,
And normally opened, normally closed solenoid valve connects the PLC outfans of automatic control system by the control end of A.C. contactor respectively.
The dehumidifying equipment of making nitrogen 5 includes Dehumidifying element and nitrogen unit processed, wherein, Dehumidifying element mainly by rotary dehumidifier, add
Pressure fan is sequentially connected composition.Nitrogen unit processed is mainly connected successively by air compressor, cooling driers, air cleaning facility, nitrogen making machine
Connect composition.The air vent of nitrogen making machine carries pressure-regulating valve door, and the outlet pressure of nitrogen making machine is 0.1-0.6MPa, pressure-regulating valve
The gas pressure of door is adjusted to 4-6KPa.
The air vent of Dehumidifying element and nitrogen unit processed is connected in parallel to after three-way control valve, by the air inlet of pipeline and air inlet folder 1
Mouth is connected, and both connect the PLC outfans of automatic control system by the control end of A.C. contactor respectively.
Embodiment 1：
As shown in figure 1, main rope of suspension bridge outside adopts sealant sealing, a confined space is internally formed；Two end bays one, two
61st, 62 360m, 480m are respectively, its cable footpath is 852mm；In across 7 be 1200m, its cable footpath be 852mm.
During enforcement, the main rope of suspension bridge need to install two sets of erosion protection systems of the present invention：One is respectively mounted at two entablatures 4
The individual nitrogen corrosion protection equipment 5 processed that dehumidifies；An air inlet folder 1 is set with each cable of two end bays one, 2 61,62 and two are located at
The exhaust clip 2 of its both sides；In four air inlets be set with 7 each cable press from both sides 1, five exhaust clips 2, and air inlet folder 1 and row
Gas folder 2 is alternately arranged.
According to the characteristic of main rope of suspension bridge, supply gas distance respectively 180m, 240m of two end bays one, 2 61,62, in across 7
Distance of supplying gas for 150m, the gas output for selecting rotary dehumidifier is 1500 m3/ h, the outlet pressure of booster fan is 4KPa,
The gas production of air compressor is 2.5m3/ min, outlet pressure are 0.85MPa, and the outlet pressure of nitrogen making machine is 0.1-0.6MPa,
The regulation pressure of outlet pressure regulating valve door is 4-6KPa.
When apparatus of the present invention power transmission works, exhaust clip is normally closed, and normally opened, the main push-towing rope that Temperature Humidity Sensor is collected is pressed from both sides in air inlet
The humidity of inner space is sent in the PLC of automatic control system with the signal of oxygen content by RS485 connections, by data
Process, PLC sends control signal, select the operational mode of the dehumidifying equipment of making nitrogen.It is relatively wet at each exhaust clip 2 when detecting
During peak >=45% of degree, PLC sends control signal so as to select Dehumidifying element operational mode, while and normally closed solenoid valve
It is powered, exhaust clip is opened, the gas that Dehumidifying element is produced is delivered in main push-towing rope by the conveyance conduit 3 shown in Fig. 1 and air inlet folder 1
Portion, the raw-gas inside main push-towing rope are discharged by exhaust clip 2.When the peak for detecting the relative humidity at each exhaust clip 2
During ＜ 45%, PLC sends control signal so as to switch to nitrogen unit operational mode processed, while and normally closed solenoid valve remain powered on,
Exhaust clip is stayed open, and nitrogen unit processed will produce nitrogen of the purity higher than 99% by conveyance conduit 3 as shown in Figure 1 and air inlet
Folder 1 is delivered to inside main push-towing rope, and main push-towing rope inside raw-gas are discharged by exhaust clip 2.When detecting oxygen content at each exhaust clip
Peak ＜ 1% when, PLC sends signal and controls nitrogen unit processed and is automatically stopped operation, while normally closed solenoid valve power-off, aerofluxuss
Clip closure, thus main push-towing rope inner space is isolated with outside air, and internal gas pressure is in air inlet folder 1 and the work of exhaust clip 2
Keep constant with lower, form an environment that cannot occur to corrode.
Embodiment 2：
Complete layout is similar with Fig. 1.Main rope of suspension bridge outside is sealed using the band mode that is wrapped, and is internally formed a confined air
Between, two sets of erosion protection systems of the present invention need to be installed.Wherein, two end bays one, 2 61,62 are respectively 460m, 491m, its cable footpath difference
For 886mm, 901mm, each cables of two end bays is respectively provided with an air inlet folder 1 and two are located at the exhaust clips that 1 both sides are pressed from both sides in air inlet
2.In across for 1480m, its cable footpath is 886mm, in across each cable be respectively provided with four air inlets and press from both sides 1, five exhaust clips 2, and enter
Gas folder 1 and exhaust clip 2 are alternately arranged.The nitrogen corrosion protection equipment 5 processed that dehumidifies is respectively mounted at two entablatures 4.
According to the characteristic of main rope of suspension bridge, supply gas distance respectively 230m, 245.5m of two end bays one, 2 61,62, in across
Distance supply gas for 185m, the gas output for selecting rotary dehumidifier is 1500 m3/ h, the outlet pressure of booster fan is 4KPa, empty
The gas production of air compressor is 2.5m3/ min, outlet pressure are 0.85MPa, and the outlet pressure of nitrogen making machine is 0.1-0.6MPa, is gone out
The regulation pressure of mouth pressure-regulating valve door is 4-6KPa.
This device course of work is similar to Example 1, when the peak for detecting the relative humidity at each exhaust clip 2 >=
When 45%, first with this device Dehumidifying element being dehumidified to outdoor air, after compression processes, obtain the air of dried and clean,
Main push-towing rope space is passed through by gas transmission pipeline 3.As the peak ＜ 45% for detecting the relative humidity at each exhaust clip 2,
After recycling nitrogen unit processed to be compressed outdoor air, by cooling driers, air cleaning facility, the sky of dried and clean is obtained
Gas, then by the equipment of making nitrogen, oxygen is removed, make nitrogen gas concn higher than 99%, the high nitrogen of hypoxia of dried and clean is finally given,
And main push-towing rope space is passed through by gas transmission pipeline 3, until detecting the peak ＜ 1% of oxygen content at each exhaust clip.It is above-mentioned
The humid air that two steps cause closed bridge main push-towing rope Central Plains and have is replaced by the gas of drying, high nitrogen, in this kind of environmental theory
The corrosion of steel construction can be completely prevented, so as to greatly improve the life-span of bridge.
And under dehumidifying, nitrogen pattern processed, the normally closed solenoid valve at exhaust clip is powered all the time so that exhaust clip keeps beating
Open, facilitate the exclusion of main push-towing rope inner space raw-gas, while the power-off always of the normally open type magnetic valve at air inlet folder so that air inlet is pressed from both sides
Stay open, the gas and high-purity nitrogen after convenient dehumidifying is passed through inside main push-towing rope.
After this device quits work, the equal power-off of normally opened, normally closed solenoid valve, aerofluxuss clip closure prevents the gas in main push-towing rope
Body and extraneous circulation；And air inlet folder is still opened, because it is directly connected with the dehumidifying equipment of making nitrogen, by the pressure influence of the equipment, therefore
And inlet pressure is stable, the gas in main push-towing rope and extraneous circulation will not be made.So that main push-towing rope inner space formation one is close
The environment for closing, and main push-towing rope by concentration higher than 99% nitrogen surround and from corrosion.
Additionally, the layout of each component of this device, Yi Jizhuan can be adjusted according to ambient humidity, length of warping winch and control standard
Wheel dehumidifier, booster fan, air compressor, the particular technique parameter of the equipment of making nitrogen and the range of accommodation of outlet pressure.
It is above specific implementation method, all any modifications made in the range of the spirit and principles in the present invention, equivalent are replaced
Change and improve, should be included within the scope of the present invention.
Claims (6)
1. a kind of main rope of suspension bridge erosion protection system, it is characterised in that including the air inlet folder being sleeved on the main push-towing rope of sealing（1）With
Exhaust clip（2）, dehumidify the equipment of making nitrogen（5）, and the automatic control system for being provided with PLC；
Described inlet and outlet folder（1、2）Temperature Humidity Sensor is inside separately installed with, each Temperature Humidity Sensor passes through respectively
RS485 connections connect the PLC serial ports of automatic control system；
Described air inlet folder（1）Air inlet at be provided with normally open type magnetic valve, exhaust clip（2）Exhaust ports be provided with normally closed type electricity
Magnet valve, and normally opened, normally closed solenoid valve connects respectively the PLC outputs of automatic control system by the control end of A.C. contactor
End；
The described dehumidifying equipment of making nitrogen（5）Including Dehumidifying element and nitrogen unit processed, both air vents are connected in parallel to three-way control valve
Afterwards, pressed from both sides by pipeline and air inlet（1）Air inlet be connected, and both are respectively by the control end of A.C. contactor connection control automatically
The PLC outfans of system processed.
2. a kind of main rope of suspension bridge erosion protection system according to claim 1, it is characterised in that described Dehumidifying element master
To be sequentially connected by rotary dehumidifier, booster fan and be constituted.
3. a kind of main rope of suspension bridge erosion protection system according to claim 1 and 2, it is characterised in that described nitrogen list processed
Unit is mainly sequentially connected by air compressor, cooling driers, air cleaning facility, nitrogen making machine and is constituted.
4. a kind of main rope of suspension bridge erosion protection system according to claim 3, it is characterised in that the row of described nitrogen making machine
QI KOU carries pressure-regulating valve door, and the outlet pressure of nitrogen making machine is 0.1-0.6MPa, and the gas pressure of pressure-regulating valve door is adjusted
For 4-6KPa.
5. a kind of main rope of suspension bridge erosion protection system according to claim 1 and 2, it is characterised in that described main push-towing rope is adopted
Sealed with the mode of be wrapped band or fluid sealant.
6. a kind of anti-corrosion method according to claim 1-5 any one described device, it is characterised in that including following concrete step
Suddenly：
（One）Pressed from both sides using the inlet and outlet of Temperature Humidity Sensor real-time monitoring（1、2）Interior relative humidity and oxygen content, it is each when detecting
Individual exhaust clip（2）During peak >=45% of interior relative humidity, automatic control system opens Dehumidifying element, and normally closed type electromagnetism
Valve is powered, exhaust clip（2）Open；The dry gas that now Dehumidifying element is produced are pressed from both sides by air inlet（1）Into main push-towing rope space, while
Raw-gas in main push-towing rope space pass through exhaust clip（2）Discharge；
（Two）In Dehumidifying element running, when detecting each exhaust clip（2）The peak ＜ 45% of interior relative humidity
When, automatic control system closes Dehumidifying element, and opens nitrogen unit processed, and normally closed solenoid valve is remained powered on, exhaust clip（2）Protect
Hold opening；Nitrogen of the purity that now nitrogen unit processed is produced higher than 99% is pressed from both sides by air inlet（1）Into main push-towing rope space, while main push-towing rope
Raw-gas in space continue through exhaust clip（2）Discharge；
（Three）In nitrogen unit running processed, when detecting each exhaust clip（2）During the peak ＜ 1% of interior oxygen content, from
Autocontrol system closes nitrogen unit processed, and normally closed solenoid valve power-off, exhaust clip（2）Close；Now it is flooded with nitrogen inside main push-towing rope
Dry gas of the purity higher than 99%, and be isolated with outside air.
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| CN201611169062.0A CN106592429B (en) | 2016-12-16 | 2016-12-16 | A kind of main rope of suspension bridge erosion protection system and method |
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| CN107366228A (en) * | 2017-07-25 | 2017-11-21 | 西南交通大学 | For the air drying methods of main rope of suspension bridge, system and air duct |
| CN108797392A (en) * | 2018-05-31 | 2018-11-13 | 中交公路规划设计院有限公司 | A kind of novel bridge Active Anticorrosion method |
| CN108824231A (en) * | 2018-09-04 | 2018-11-16 | 中智桥康（武汉）科技有限公司 | It is a kind of with inert gas maintenance main rope of suspension bridge protective system and its maintenance anti-corrosion mode implementation method |
| CN109140995A (en) * | 2018-08-20 | 2019-01-04 | 江苏中矿大正表面工程技术有限公司 | A kind of main rope of suspension bridge removal moisture drying system and detection device |
| CN111945562A (en) * | 2020-08-12 | 2020-11-17 | 郑州大学 | Dehumidification method of main cable of suspension bridge |
| CN114395982A (en) * | 2022-01-24 | 2022-04-26 | 中国矿业大学 | Liquid nitrogen supply system with corrosion inhibition and fire extinguishing functions for bridge steel cable |
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| CN111945562A (en) * | 2020-08-12 | 2020-11-17 | 郑州大学 | Dehumidification method of main cable of suspension bridge |
| CN111945562B (en) * | 2020-08-12 | 2022-07-01 | 郑州大学 | Dehumidification method of main cable of suspension bridge |
| CN114395982A (en) * | 2022-01-24 | 2022-04-26 | 中国矿业大学 | Liquid nitrogen supply system with corrosion inhibition and fire extinguishing functions for bridge steel cable |
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| CN106592429B (en) | 2018-08-28 |
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Inventor after: Ni Ya Inventor after: Liu Jun Inventor after: Zhao Qingqing Inventor after: Wang Bo Inventor after: Yang Fan Inventor after: Gao Haitang Inventor after: Zhou Chunxia Inventor after: Liu Guobin Inventor after: Chen Tianjian Inventor before: Li Peng Inventor before: Chen Tianjian Inventor before: Liu Jun Inventor before: Wang Bo Inventor before: Zhao Qingqing Inventor before: Ni Ya Inventor before: Yang Fan Inventor before: Gao Haitang Inventor before: Zhou Chunxia Inventor before: Liu Guobin |