A kind of main rope of suspension bridge erosion protection system and method
Technical field
The present invention relates to a kind of main rope of suspension bridge erosion protection system and methods, belong to bridge life-cycle protection technology field.
Background technology
Main push-towing rope is the lifeline of suspension bridge, is made of multi beam steel tendon, and steel tendon is by multiply high-strength galvanized steel wire group
At.Since suspension bridge use environment is severe, mostly hot humid environment, the corrosion for the service life of guarantee bridge, main push-towing rope is anti-
It protects particularly important.The corrosion rate of main push-towing rope is determined that the presence with humidity, temperature and hazardous medium has by the environment residing for it
It closes.Such as:Humidity is as deciding factor, and when the relative humidity of air is below 60%, the corrosion of main push-towing rope is very slight;But
When relative humidity increases to a certain numerical value, the corrosion rate of main push-towing rope will increase suddenly, this numerical value is known as critical humidity.When
In normal temperature environment, under the action of moisture in an atmosphere, oxygen and other pollutants, electrochemical corrosion occurs for main push-towing rope steel wire, i.e.,
Steel wire constitutes the anode of primary battery, and occurring to chemically react with water, the oxygen in air becomes iron rust, and iron rust can absorb a large amount of water
Point, cause rusty scale volume expansion that corrosion is made to continue to expand to inside;In hot environment, chemical corruption can occur for main push-towing rope steel wire
After erosion, i.e. metal and dry air contact, surface can generate the compounds such as chloride, sulfide, oxide, 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 the prior art, it is real to mostly use the mode for controlling inner air relative humidity for the erosion protection system of main rope of suspension bridge
Existing anti-corrosion protection purpose, by constantly removing the content of water vapor in air, to avoid causing in steel wire surface formation moisture film
Steel wire corrodes.Such method has certain effect for slowing down the corrosion rate of main push-towing rope, but with the increase of bridge service phase, main
The corrosion rate of cable can also gradually increase, and not only shorten the service life of bridge, but also also constitute prestige for the safety of entire bridge
The side of body.Also, there is no realizations to automatically control for traditional bridge dehumidifying anti-corrosion method, and dehumidification system is in the shape of continuous operation
State causes the energy and greatly wastes.
In conclusion for the shortcoming of above main push-towing rope dehumidifying anti-corrosion method, if can have a kind of device can be from root
The etching problem of main rope of suspension bridge is solved in sheet, and can be realized by using automatic control system, it will be with great research
Meaning.
Invention content
For above-mentioned existing technical problem, a kind of main rope of suspension bridge erosion protection system of present invention offer and method utilize
Automatic control system realizes dehumidifying and the automatic switchovers of two kinds of functions of nitrogen processed, is higher than to provide a nitrogen gas purity inside main push-towing rope
99% environment not corroded, fundamentally to solve the etching problem of main rope of suspension bridge.
To achieve the above object, the present invention provides a kind of main rope of suspension bridge erosion protection system, including is sleeved on main push-towing rope
Air inlet folder and exhaust clip, dehumidify the equipment of making nitrogen, and the automatic control system equipped with PLC;
It is separately installed with Temperature Humidity Sensor in the inlet and outlet folder, each Temperature Humidity Sensor passes through RS485 respectively
Connection connects the PLC serial ports of automatic control system;
Normally open type magnetic valve is equipped at the air inlet of the air inlet folder, the exhaust ports of exhaust clip are equipped with normally closed type electromagnetism
Valve, and normally opened, normally closed solenoid valve connects the PLC output ends of automatic control system by the control terminal of A.C. contactor respectively;
The dehumidifying equipment of making nitrogen includes Dehumidifying element and nitrogen unit processed, and the exhaust outlet of the two is connected in parallel to three-way control valve
Afterwards, it is connected with the air inlet that air inlet is pressed from both sides by pipeline, and the two is automatically controlled by the connection of the control terminal of A.C. contactor respectively
The PLC output ends of system.
Further, the Dehumidifying element is mainly sequentially connected by rotary dehumidifier, booster fan and is formed.
Further, the nitrogen unit processed mainly by air compressor, cooling driers, air cleaning facility, nitrogen making machine successively
Connection composition.Further, the exhaust outlet of the nitrogen making machine carries pressure-regulating valve door, and the outlet pressure of nitrogen making machine is 0.1-
The gas pressure of 0.6MPa, pressure-regulating valve door are adjusted to 4-6KPa.
Further, the main push-towing rope is sealed by the way of being wrapped band or fluid sealant.
The present invention provides a kind of anti-corrosion method of above-mentioned apparatus again, comprises the following specific steps that:
(One)Monitor the relative humidity and oxygen content in inlet and outlet folder in real time using Temperature Humidity Sensor, it is each when detecting
When the peak of the relative humidity in a exhaust clip >=45%, automatic control system opens Dehumidifying element, and normally closed solenoid valve is logical
Electricity, exhaust clip are opened;The dry gas that Dehumidifying element generates at this time enters main push-towing rope space by air inlet folder, while in main push-towing rope space
Original gas is discharged by exhaust clip;
(Two)In Dehumidifying element operational process, as the peak < 45% for detecting the relative humidity in each exhaust clip
When, automatic control system closes Dehumidifying element, and opens nitrogen unit processed, and normally closed solenoid valve remains powered on, and exhaust clip is kept
It opens;Nitrogen of the purity that nitrogen unit processed generates at this time higher than 99% enters main push-towing rope space by air inlet folder, while in main push-towing rope space
Original gas continues through exhaust clip discharge;
(Three)In nitrogen unit operational process processed, when detecting the peak < 1% of the oxygen content in each exhaust clip,
Automatic control system closes nitrogen unit processed, and normally closed solenoid valve powers off, and is vented clip closure;Nitrogen to be flooded with inside main push-towing rope pure at this time
Dry gas of the degree higher than 99%, and be isolated with outside air.
Main rope of suspension bridge erosion protection system of the present invention utilizes Automatic Control Theory, passes through the temperature in being pressed from both sides mounted on inlet and outlet
Humidity sensor monitors the humidity and oxygen content of main push-towing rope inner space in real time, and collected data are sent to
Automatic control system is handled and is fed back, to automatically select the operational mode of the dehumidifying equipment of making nitrogen.When main push-towing rope space is opposite
When the peak of humidity >=45%, automatic control system selects Dehumidifying element operational mode;When the highest of main push-towing rope space relative humidity
When 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 due to air inlet folder is connected with the dehumidifying equipment of making nitrogen
The stable gas pressure for obtaining air inlet, to ensure that main push-towing rope space interior completely cuts off with outside air, gas pressure is constant, and maintenance one is not
The environment corroded.
In conclusion present invention is mainly applied on bridge, it is different from traditional air dehumidification method, introducing automatically controls
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, and a ring that corrosion reaction can not occur is created for bridge cable steel construction
Border fundamentally solves the problems, such as that electrochemical corrosion occurs for bridge cable steel construction, is a kind of long-acting bridge anti-corrosion method.
In traditional bridge dehumidifying Corrosion prevention scheme, since the conveying gas capacity of dehumidification system is limited, air inlet folder, exhaust clip
Mounting distance is greatly increased than comparatively dense, not only cost, and installation is time-consuming and laborious, also has centainly for the effect on moisture extraction of cable entirety
Influence.Compared with the prior art, the invention has the advantages that:
1, the packing density of air inlet folder, exhaust clip is reduced, the mounting distance of air inlet folder and exhaust clip can be by original 200
Rice extends to 2000 meters or more so that the gas fed distance inside main push-towing rope greatly prolongs, and to save the energy, reduces into
This, improves arrangement efficiency.
2, the humidity and oxygen content according to main push-towing rope inner space can be monitored in real time, 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 manual operation, improve main push-towing rope internal gas
The accuracy of quality control.
When dry gas of the nitrogen gas purity higher than 99% 3, can be flooded with inside main push-towing rope, passes through and control normally opened, normally closed type
Solenoid 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
Service life 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 method for the present invention;
In figure:1, air inlet is pressed from both sides, and 2, exhaust clip, 3, conveyance conduit, 4, upper beam, 5, the dehumidifying equipment of making nitrogen, 61, two end bays
One, 62, two end bays two, 7, in across.
Specific implementation mode
With reference to embodiment and attached 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 the automatic control system equipped with PLC.
Wherein:It is separately installed with Temperature Humidity Sensor in 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, Temperature Humidity Sensor at air inlet folder 1 predominantly detects pair
As if it is sent into the relative humidity and oxygen content of the gas in main push-towing rope space, it can reflect the workability of Dehumidifying element and nitrogen unit processed
Can, reference is provided for staff, is convenient for follow-up maintenance.The object that predominantly detects of Temperature Humidity Sensor is main push-towing rope at exhaust clip 2
Relative humidity and oxygen content and the present apparatus parameter index to be controlled of the gas of inner space.
Normally open type magnetic valve is equipped at the air inlet of air inlet folder 1, the exhaust ports of exhaust clip 2 are equipped with normally closed solenoid valve,
And normally opened, normally closed solenoid valve connects the PLC output ends of automatic control system by the control terminal of A.C. contactor respectively.
The equipment of making nitrogen 5 that dehumidifies includes Dehumidifying element and nitrogen unit processed, wherein Dehumidifying element mainly by rotary dehumidifier plus
Pressure fan is sequentially connected composition.Nitrogen unit processed is mainly connected by air compressor, cooling driers, air cleaning facility, nitrogen making machine successively
Connect composition.The exhaust outlet 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.
After the exhaust outlet of Dehumidifying element and nitrogen unit processed is connected in parallel to three-way control valve, pass through the air inlet of pipeline and air inlet folder 1
Mouth is connected, and the two passes through the PLC output ends that the control terminal of A.C. contactor connects automatic control system respectively.
Embodiment 1:
As shown in Figure 1, being sealed using fluid sealant outside main rope of suspension bridge, inside forms a confined space;Two end bays one,
2 61,62 be respectively 360m, 480m, and cable diameter is 852mm;In across 7 be 1200m, cable diameter 852mm.
When implementation, which need to install two sets of erosion protection systems of the present invention:One is installed respectively at two upper beams 4
A dehumidifying nitrogen corrosion protection equipment 5 processed;It is set with an air inlet folder 1 on each cable of two end bays one, 2 61,62 and two are located at
The exhaust clip 2 of its both sides;In press from both sides 1, five exhaust clip 2, and air inlet folder 1 and row across being set with four air inlets on 7 each cable
Gas folder 2 is alternately arranged.
According to the characteristic of main rope of suspension bridge, two end bays one, 2 61,62 supply gas distance be respectively 180m, 240m, in across 7
Supply gas distance be 150m, select the gas output of rotary dehumidifier for 1500 m3The outlet pressure of/h, booster fan are 4KPa,
The gas production of air compressor is 2.5m3The outlet pressure of/min, outlet pressure 0.85MPa, nitrogen making machine are 0.1-0.6MPa,
The adjusting 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 collected main push-towing rope of Temperature Humidity Sensor is pressed from both sides in air inlet
The humidity of inner space and the signal of oxygen content are sent to by RS485 connections in the PLC of automatic control system, and data are passed through
Processing, PLC send out control signal, the operational mode of the selection dehumidifying equipment of making nitrogen.It is relatively wet at each exhaust clip 2 when detecting
When the peak of degree >=45%, PLC sends out control signal to select Dehumidifying element operational mode, while and normally closed solenoid valve
It is powered, exhaust clip is opened, and the gas that Dehumidifying element generates is delivered to by conveyance conduit 3 shown in FIG. 1 and air inlet folder 1 in main push-towing rope
Raw-gas inside main push-towing rope is discharged by exhaust clip 2 in portion.When the peak for detecting the relative humidity at each exhaust clip 2
When < 45%, PLC sends out control signal to switch to nitrogen unit operational mode processed, while and normally closed solenoid valve remain powered on,
Exhaust clip stays open, and nitrogen unit processed will generate nitrogen of the purity higher than 99% and pass through conveyance conduit 3 as shown in Figure 1 and air inlet
Folder 1 is delivered to inside main push-towing rope, and raw-gas inside main push-towing rope is discharged by exhaust clip 2.When detecting oxygen content at each exhaust clip
Peak < 1% when, PLC, which sends out signal and controls nitrogen unit processed, is automatically stopped operation, while normally closed solenoid valve powers off, and is vented
Clip closure, thus main push-towing rope inner space is isolated with outside air, and internal gas pressure is in the work of air inlet folder 1 and exhaust clip 2
It is remained unchanged under, forms an environment that can not corrode.
Embodiment 2:
Complete layout is similar with Fig. 1.It is sealed using the band mode that is wrapped outside main rope of suspension bridge, inside formation one is closed
Space need to install two sets of erosion protection systems of the present invention.Wherein, two end bays one, 2 61,62 are respectively 460m, 491m, cable diameter point
Not Wei 886mm, 901mm, an air inlet folder 1 is respectively set in each cables of two end bays and two are located at the exhausts that 1 both sides are pressed from both sides in air inlet
Folder 2.In across for 1480m, cable diameter 886mm, in across each cable four air inlets be respectively set press from both sides 1, five exhaust clip 2, and
Air inlet folder 1 and exhaust clip 2 are alternately arranged.One dehumidifying nitrogen corrosion protection equipment 5 processed is installed respectively at two upper beams 4.
According to the characteristic of main rope of suspension bridge, two end bays one, 2 61,62 supply gas distance be respectively 230m, 245.5m, in across
Distance of supplying gas is 185m, selects the gas output of rotary dehumidifier for 1500 m3The outlet pressure of/h, booster fan are 4KPa, empty
The gas production of air compressor is 2.5m3The outlet pressure of/min, outlet pressure 0.85MPa, nitrogen making machine are 0.1-0.6MPa, are gone out
The adjusting pressure of mouth pressure-regulating valve door is 4-6KPa.
The present apparatus course of work is similar to Example 1, when the peak for detecting the relative humidity at each exhaust clip 2 >=
When 45%, is being dehumidified to outdoor air, after compression processing first with present apparatus Dehumidifying element, is obtaining the air of dried and clean,
It is passed through main push-towing rope space by gas transmission pipeline 3.When detecting the peak < 45% of the relative humidity at each exhaust clip 2,
After recycling nitrogen unit compresses 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, so that nitrogen gas concn is higher than 99%, finally obtain the high nitrogen of hypoxemia of dried and clean,
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
Two steps so that original humid air is replaced by the gas of drying, high nitrogen in closed bridge main push-towing rope, in such environmental theory
It can be prevent completely the corrosion of steel construction, to greatly improve the service life of bridge.
And dehumidifying, under nitrogen pattern processed, the normally closed solenoid valve at exhaust clip is powered always so that exhaust clip holding is beaten
It opens, facilitates the exclusion of main push-towing rope inner space raw-gas, while the normally open type magnetic valve at air inlet folder powers off always so that air inlet is pressed from both sides
It stays open, gas and high-purity nitrogen after dehumidifying is facilitated to be passed through inside main push-towing rope.
After the present apparatus is stopped, normally opened, normally closed solenoid valve powers off, and is vented clip closure, prevents the gas in main push-towing rope
Body circulates with extraneous;And air inlet folder is still opened, and because it is directly connected with the dehumidifying equipment of making nitrogen, by the pressure influence of the equipment, therefore
And inlet pressure is stablized, and the gas in main push-towing rope will not be made to circulate with extraneous.So that main push-towing rope inner space formation one is close
The environment closed, and main push-towing rope by concentration higher than 99% nitrogen surround and from corrosion.
In addition, the layout of each component of the present apparatus, Yi Jizhuan can be adjusted according to ambient humidity, length of warping winch and control standard
Take turns dehumidifier, booster fan, air compressor, the particular technique parameter of the equipment of making nitrogen and the adjustable range of outlet pressure.
Above be specific implementation method, it is all within the scope of the spirit and principles in the present invention made by it is any modification, equally replace
It changes and improves, should all be included in the protection scope of the present invention.