KR20030037799A - Dehumidifier for bridge - Google Patents

Abstract

PURPOSE: A bridge dehumidifying device using a dehumidifying filter is provided to extend the life of a bridge by effective post management for the internal corrosion of a box girder. CONSTITUTION: The bridge dehumidifying device using an underwater dehumidifying filter comprises: a housing(200) installed in a connection pipe which connects both ends of two box girders; a ventilator(203) installed to an outlet side of the housing(200) to circulate the air in the box girders compulsively; a dehumidifying filter(210) composed of a primary metal net(212), Zeolites(211) and a secondary metal net(213) to absorb moisture in the air flew in the housing(200); a heater(214) installed closely to the outside of the dehumidifying filter(210) to evaporate the absorbed moisture in the Zeolites(211); an exhaust fan(261) installed on an exhaust pipe(260) which is installed on the outside of the housing(200) to discharge the evaporated moisture to the outside if the moisture of the Zeolites is evaporated by the heater(214); and a suction pipe(220) installed to the outside of the heater(214) to let the outside air flow in the housing(200) when the moisture is discharged by the exhaust fan(261).

Description

Dehumidifier for bridge

The present invention relates to a bridge dehumidification apparatus, and more particularly, to a bridge dehumidification apparatus to be dehumidified by a radiator installed inside and outside the box girder.

In general, the structural elements of the basic suspension bridge can be divided into reinforcement type, main cable, pylon, and anchorage part. The reinforcement supports and distributes the load and bears the aerodynamic stability of the overall structure. The load on the reinforcement is transmitted to the main cable through a hanger.

Reinforcement types of these suspension bridges have been constructed in a variety of forms, which can be divided into type I, trust and box girder. Type I molds were used in early Dandan suspension bridges, but they are rarely used since they are known to be aerodynamically disadvantageous. Trusts and box girders have advantages and disadvantages, depending on their aerodynamic properties, ease of installation, and ease of maintenance, and are selected for their superiority.

Box girders can be divided into PSC box girders and steel box girders depending on the material. Steel box girders are mainly used for large bridges.

However, steel box girders used in bridges are more likely to form oxides on the surface of metals because of the high moisture content around them and the sealed interior. The outer surface of the box girder can prevent the surface from rusting by performing antirust treatment such as painting, but there is a problem that the inside of the box girder is difficult to paint. In addition, even a slight anti-rust treatment, the anti-rust effect is lost over time, and there is a possibility that oxidized on the inner surface of the box girder due to the moisture inside.

A technique for preventing corrosion and removing rust inside a box girder is disclosed in Patent Publication No. 2000-59796. This technique uses a flexible axial wire brush, inserting the wire brush into the box girder to remove the rust, removing the rust that has been removed using a vacuum cleaner, drying the box girder, and then using the injector to the box. Dispersing a rust converting agent on the entire surface of the girder to convert the residual rust to the anticorrosive coating, and further comprises the step of adding a vaporizing corrosion inhibitor.

However, this technique is not only a method of removing rust after the rust has already occurred, but also requires a person to remove it using a machine or a tool. There is a problem to break through. And if the box girder is long, there is a problem that it is difficult to remove the rust deep in the wire brush and vacuum cleaner.

The present invention is to solve such a problem, an object of the present invention is to effectively remove the moisture inside the box girder of the bridge to prevent the inside of the box girder to prolong the life of the bridge, to increase the reliability of the bridge It is to provide a dehumidifier.

1 is an elevation view of a bridge to which a box girder according to the present invention is applied.

FIG. 2 is a cross-sectional view illustrating an arrangement structure of a box girder and a bridge dehumidifier of FIG. 1.

3 is a perspective view showing a bridge dehumidifier according to the present invention.

4 is a cross-sectional view showing a bridge dehumidifier according to the present invention.

5A and 5B are cross-sectional views showing an operating state of an intake pipe installed in a bridge dehumidifier according to the present invention.

<Description of the symbols for the main parts of the drawings>

12.Communicator

200 ... Housing

210 Zeolite

213 ... heater

220.Intake pipe

260 exhaust pipe

Bridge dehumidifying apparatus according to the present invention for achieving the above object is installed in parallel with each other the housing is installed in the interior of the communication pipe communicating one end and the other end of the two box girder reinforcement support the upper plate; A blower installed at an outlet side of the housing to forcibly circulate air in the box girder; A dehumidification filter in which a first metal net, a zeolite, and a second metal net are sequentially stacked from the air inlet side to absorb moisture in the air introduced into the housing; A heater installed adjacent to the outer circumferential side of the dehumidification filter of the housing to evaporate moisture absorbed in the zeolite; An exhaust pipe installed on the outer circumferential side of the housing and an exhaust fan installed on the exhaust pipe to exhaust the vaporized moisture to the outside when the moisture impregnated in the zeolite by the operation of the heater is evaporated; It is provided on the outside of the heater is provided with an intake pipe to allow outside air to flow into the housing when the moisture is exhausted by the exhaust fan.

Preferably, the inside of the intake pipe has an inlet formed on a side thereof, and a plunger having a suction passage formed with an outlet opened toward the inside of the housing, and a support plate protruding toward an inner circumferential side of the suction pipe at an inner end of the plunger. And a support jaw is formed between the support plate and the head of the plunger in the inner circumference of the intake pipe, and both sides of the support jaw open and close the suction path by moving the plunger from the inside of the intake pipe. Opening and closing means are provided.

In addition, the opening and closing means is installed between the head of the plunger and the support jaw and when the heat is applied to a predetermined temperature or more by the operation of the heater expands to a stored shape to push the plunger out of the suction pipe to the suction path The first shape-mold suppression alloy for introducing outside air into the furnace and the support plate of the plunger and the support jaw, and when the heat applied to the plunger is below a predetermined temperature, expands to the stored shape to expand the plunger into the suction pipe. And returning to block the inflow of outside air into the suction passage.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

Figure 1 schematically shows a bridge to which the bridge dehumidification apparatus according to the present invention is applied. The bridge is a bridge 10, which forms a substructure of the bridge, a first box girder 11 and a second box girder 11 'forming an upper structure, and a supporting structure for supporting the box girders 11, 11'. It includes. And the upper plate 12 is installed on the top of the box girder (11, 11 '), the packaging for the passage and walking of the vehicle is made thereon.

And the bridge dehumidifier according to the present invention is installed at both ends of the box girder (11) (11 ') as shown in FIG. By the way. The middle portions inside the box girders 11 and 11 'are isolated from each other. It is generally installed in a considerably longer length depending on the width and the installation site because the length of the box girders 11 and 11 'is extended by the length of the bridge. Therefore, it is preferable to separate the insides of the box girders 11 and 11 'at appropriate positions according to the lengths of the bridges, and to install separate bridge dehumidifiers in the isolated portions.

One box girder 11 isolated as described above is communicated with the other box girder 11 'which is arranged together in parallel on the side thereof by means of a communication tube 12. And the dehumidifier is provided with a blower 203 is to continue the air circulation in the two box girders (11, 11 ').

3 and 4, the bridge dehumidifier according to the present invention is installed in the communication tube 12, the inlet side 201 is in communication with the first box girder 11 side, the outlet side ( 202 is in communication with the second box girder 11 '. In addition, the inlet side 201 and the outlet side 202 are both provided with a cylindrical housing 200 in the form of a pipe, and the outlet side 202 of the housing 200 is provided with the blower 203 mentioned above.

In addition, a dehumidifying filter 210 for absorbing moisture in the air flowing from the first box girder 11 is installed at an intermediate portion between the inlet side 201 and the outlet side 202 of the housing 200. The dehumidification filter 210 is installed on both sides of the zeolite 211 and the zeolite 211 and is implemented with a first metal net 212 and a second metal net 213 for firmly supporting the zeolite 211. The metal meshes 212 and 213 should be implemented as a fine wire mesh having a pore structure as much as possible, so that the rigid support of the zeolite 211 with weak hardness is achieved.

In addition to the zeolite 211, activated carbon, diatomaceous earth, silica gel, starch, bentonite, alumina, and the like may be applied to the dehumidification filter 210. Repeatability and moisture absorption rate is almost 20 times better than that of zeolite. If necessary, titanium oxide or a glass filter may be installed on both sides of the zeolite 211 to have a dust collecting capability and a deodorizing capability.

Subsequently, an intake pipe 220 and an exhaust pipe 260 opened from the housing 200 to the outside of the communication pipe 12 are installed outside the middle portion of the housing 200 in which the zeolite 211 is installed, and the dehumidification filter 210 is provided. The heater 214 is mounted between the outer peripheral side of the intake pipe 220 and the exhaust pipe 260.

The heater 214 heats and evaporates the moisture of the dehumidification filter 210 when the predetermined amount of moisture is absorbed by the dehumidification filter 210, and exhausts it to the outside through the exhaust pipe 260. When the exhaust of the internal air through the exhaust pipe 260 is to replenish the air to the inside. That is, the intake pipe 220 is intended to prevent the formation of a vacuum state inside the box girders 11 and 11 ′.

More specifically, the exhaust pipe 260 and the intake pipe 220 will be described. First, the exhaust pipe 260 is provided with an exhaust fan 261 therein, and an opening and closing plate 262 is mounted at the outlet. The opening and closing plate 262 is supported at its coupling end by an exhaust pipe 260 and a torsion spring (not shown). Therefore, when the exhaust fan 261 operates, the outlet of the exhaust pipe 260 is opened by the blowing force, and when the exhaust fan 261 does not operate, the exhaust fan 261 is restored by the torsion spring to close the outlet of the exhaust pipe 260.

Intake pipe 220 is provided with a separate plunger 230 therein, as shown in Figure 5a and b. The plunger 230 has a substantially "I" shape, and a plurality of inlets are formed on the side of the head and extends along the inside of the plunger 230 to the support plate 232 formed at the bottom of the plunger 230. A suction passage 231 is formed in which the outlet is opened.

Therefore, the outside air is introduced into the side of the dehumidification filter 210 along the suction path 231 of the plunger 230 when the head of the plunger 230 protrudes outward.

In and out of the intake pipe 220 of the plunger 230 is operated by two shape memory alloys 240 and 250 in the form of a coil. To this end, a support jaw 221 protruding into a portion between the head of the plunger 230 and the support plate 232 is formed in the intake pipe 220, and the upper surface and the plunger 230 of the support jaw 221 are formed. The first mold restraint alloy 240 is installed between the head portions of the second mold rest recess alloy 250 on the bottom surface of the support jaw 221 and the support plate 232 of the plunger 230.

The first shape-retaining alloy 240 is a state in which the plunger 230 enters the inside of the intake pipe 220, that is, in a state in which no suction of external air is performed, and the second shape-retaining alloy 250 is formed. Is in the expanded state at this time. When the heat is applied from the heater 214, the shape is changed into their stored shapes. In the case of the first mold restraint alloy 240, the second mold restraint alloy 250 is in a contracted state. It is supposed to be.

Hereinafter, the operation state of the bridge dehumidifier according to the present invention configured as described above will be described.

The bridge dehumidifier of the present invention is installed in the communication tube 12 between the first box girder 11 and the second box girder 11 'and is operated by the blower 203 to operate the first box girder 11 and the second box. The moisture in the air circulating in the girder 11 'is dehumidified.

The action is largely in two forms. That is, by operating the blower 203, the air inside each box girder 11'11 'is circulated to dehumidify in the dehumidification filter 210 and the moisture absorbed by the dehumidifying filter 210 is evaporated. Exhaust is made by exhaust operation.

Dehumidification operation is the operation of the blower 203 after the air flowing from the first box girder 11 to the inlet side 201 of the housing 200 flows into the zeolite 211 through the first metal net 212 Water in the air is absorbed by the zeolite 211, and the air after the moisture is absorbed into the blower 203 through the second metal net 213 and then flows out to the second box girder 11 ′ and continues circulation. Will be.

If the dehumidification operation is continued for a considerable time, the zeolite 211 is in a state in which a considerable amount of moisture is absorbed. However, if the moisture absorbed from the zeolite 211 is not removed, the zeolite 211 cannot perform the continuous hygroscopic operation, and thus the semi-permanent use of the zeolite 211 must be periodically removed from the zeolite 211. It becomes possible.

For this purpose, the exhaust operation is performed, and the exhaust operation may be performed according to a state determined by the humidity sensor by installing a separate humidity sensor (not shown). The exhaust operation, which is started accordingly, operates the heater 214 while the blower 203 is stopped.

When the heater 214 is operated, the air impregnated in the zeolite 211 is heated and evaporated. The exhaust fan 261 of the exhaust pipe 260 operates to exhaust the evaporated water to the outside. The operation of the 261 opens the opening and closing plate 262 of the exhaust pipe 260 to externally exhaust the moisture.

On the other hand, there is a possibility that the inside of the box girders 11 and 11 'will be in a vacuum state due to such an exhaust operation. In order to prevent this, the intake pipe 220 is introduced into the outside air. The intake pipe 220 starts to restore the shape in the expanded state while the heated first mold restraint alloy 240 is contracted as the heater 214 operates, and at the same time, the second mold restraint alloy 250 When the shape restoration is started in the contracted state in the expanded state, the plunger 230 is pushed to the outside of the intake pipe 220 to expose the shape of the shape memory alloys 240 and 250 at this time. .

Accordingly, the inlet of the suction passage 231 formed in the plunger 230 is opened, and the external air is sucked by the suction force by the operation of the exhaust fan 262 described above. By the way, the air to be sucked may contain a significant amount of water to be introduced with the air to be sucked. However, since the installation position of the intake pipe 220 is located outside the side of the dehumidification filter 210, the moisture in the air to be sucked first passes through the zeolite 211, so that the box girder 11 and 11 are in a dehumidified state. ') Flows inside. Therefore, air replenishment is performed only with little damage to the dehumidification state inside the box girders 11 and 11 '.

When the exhaust operation is performed for a considerable time and the restoration of the moisture absorption state of the zeolite 211 is completed, the operation of the heater 214 is stopped, and at the same time, the operation of the exhaust fan 261 is also stopped. The blower is then operated again to perform the continuous dehumidification operation.

On the other hand, the plunger 230 of the intake pipe 220 is restored only when the heat heated by the heater 214 falls to a normal temperature state. Therefore, even if the operation of the heater 214 is stopped, the plunger 230 is gradually restored. At this time, the restoring operation is performed in the contracted state in the case of the first mold restraint alloy 240 and in the expanded state in the case of the second mold restraint alloy 250, thereby pulling the plunger 230 into the intake pipe 220. The inlet of the suction passage 231 is closed.

Bridge dehumidifier according to the present invention as described above has a dehumidification filter that can be permanently used for repeated dehumidification for the dehumidification inside the box girder and a heater and an exhaust pipe to restore the function of the dehumidification filter, the configuration of the embodiment Unlike the type and configuration of the dehumidification filter or some modifications to the configuration of the exhaust pipe and the suction pipe, it should be regarded that all included in the technical scope of the present invention basically including the configuration claimed in the present invention.

Bridge dehumidification apparatus according to the present invention as described above to the indoor radiator and the outdoor radiator to dehumidify the moisture in the air circulating in the two box girders after the rust generated in the box girder By making the management more efficient, there is an effect of improving the life and reliability of the bridge.

Claims (3)

A housing installed in the communication tube installed in parallel with each other so as to communicate one end and the other end of two box girders that reinforce and support the upper plate; A blower installed at an outlet side of the housing to forcibly circulate air in the box girder; A dehumidification filter in which a first metal net, a zeolite, and a second metal net are sequentially stacked from the air inlet side to absorb moisture in the air introduced into the housing; A heater installed adjacent to the outer circumferential side of the dehumidification filter of the housing to evaporate moisture absorbed in the zeolite; An exhaust pipe installed on the outer circumference of the housing and an exhaust fan installed on the exhaust pipe so as to exhaust the evaporated moisture to the outside when the moisture impregnated in the zeolite by the operation of the heater is evaporated; And an intake pipe installed outside the heater to allow outside air to flow into the housing when moisture is exhausted by the exhaust fan. The plunger of claim 1, wherein an inlet is formed at a side of the intake pipe, and a plunger having a suction passage having an outlet opened toward the inside of the housing is provided, and an inner end of the plunger is located at an inner circumferential side of the suction pipe. A protruding support plate is formed, and a support jaw is formed between the support plate and the head of the plunger in the inner circumference of the intake pipe, and both sides of the support jaw operate the plunger from the inside of the intake pipe into the suction port. Bridge dehumidifier characterized in that the opening and closing means for opening and closing the provided. According to claim 2, The opening and closing means is installed between the head of the plunger and the support jaw when the heat is applied to a predetermined temperature or more by the operation of the heater expands to the stored shape to push the plunger to the outside of the suction pipe The first shape-mold suppression alloy to allow the outside air to flow into the suction passage, and is installed between the support plate and the support jaw of the plunger and when the heat applied to the plunger is below a predetermined temperature, the plunger expands to the stored shape and causes the plunger to flow into the suction pipe. Bridge dehumidifying apparatus comprising a second shape-retaining alloy for returning to the inside of the inlet to block the inflow of outside air into the suction passage.