JP2010209532A - Device for regulating humidity of internal space of long hollow pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce deterioration in a hollow pipe caused by rust etc., so as to maintain high durability by suppressing dew condensation and the accumulation of water in such a manner as to suppress the occurrence of a high humidity fluctuation in one cycle per day between high and low humidity in a vertically or obliquely-installed long hollow pipe for use in a bridge, a building, etc., without the use of a power source. <P>SOLUTION: A cap body 10 is provided at the uppermost end of the vertical hollow steel pipe 1 in such a manner as to communicate with the internal space 1c of the hollow pipe 1; a large number of small holes 10b are formed at the outer peripheral surface of the cap body 10; a small-size humidity fluctuation suppressing device 11 in which three waterproof permeable films are formed at required spaces in an internal ventilation passage of a communication cylinder is horizontally attached to each of the small holes 10b; a fixing plate 12 and a mesh net 13 for supporting an outer end of the small-size humidity fluctuation suppressing device 11 are attached; and an overcoat 14 is attached to form a lower ventilation passage 15a by enveloping them. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  According to the present invention, the humidity of the internal space of a hollow pipe such as a steel pipe or pipe standing vertically or obliquely high, such as a main pillar pipe of a bridge or a building, greatly varies depending on the humidity and temperature of the atmosphere. The present invention relates to a technique for increasing the durability of a hollow tube by suppressing it to a low level using a water vapor permeable membrane and reducing deterioration such as rust and corrosion of the hollow tube due to condensed water caused by humidity fluctuations.

  Conventionally, no specific measures have been taken to adjust the humidity in the vertical hollow tube other than natural ventilation. In the current weather environment, which is causing abnormalities in the heat belt circulation of heat exchange due to global warming, etc., the difference between cold and warm becomes large, and it is difficult for the progress of corrosion in vertical hollow pipes such as rapid weather fluctuations and wind speed fluctuations. Unfavorable situation goes on. Corrosion phenomenon, which is a kind of chemical reaction, also progresses rapidly with increasing temperature, and it is likely that the service life will be significantly less than the expected service life, and the risk of seriously threatening safety has also increased. But before warming became apparent, it was impossible to predict.

  Conventionally, as a measure to suppress the entry of rainwater, insects, birds, dust, etc. into the steel pipe of a vertical main pillar installed outdoors, as shown in JP-A-2004-229811, the uppermost end opening inside the main pillar In addition, there is known a structure in which an inverted J-shaped elbow tube having a lower opening is connected and a mesh is attached to the lower opening. However, the inside of the steel pipe communicates with the atmosphere, and air and humidity (water vapor) can freely enter and exit. For this reason, when the humidity of the air greatly fluctuates, the humidity of the air inside the steel pipe also fluctuates greatly, and this fluctuation may cause dew condensation and accumulated water inside the steel pipe. This may accelerate the progress of corrosion and rust inside the steel pipe and shorten the service life of the steel pipe. In order to avoid this, a drainage hole was provided at the bottom of the steel pipe so that condensed water and rainwater would not accumulate in the steel pipe. However, even this did not prevent deterioration due to condensation. Furthermore, even if the inside of the steel pipe is completely sealed, dew condensation or the phenomenon that water is stored in the protected space that should have been sealed cannot be avoided.

The inventor of the present application provides a water vapor movement control apparatus that controls the movement of water vapor and keeps humidity fluctuations in the room low by arranging a plurality of waterproof water vapor permeable membranes in an air passage that communicates the sealed chamber and the atmosphere. This application has been published as JP-A-7-68124, JP-A-5-322060, and JP-A-2008-200552.
These devices developed by the present inventor were able to maintain the rate of humidity drop with one arrangement per room space 125L. However, it has not been conceived to use a permeable membrane for adjusting the humidity inside a special tube called a hollow tube of a building of 100 m or more.

JP 2004-229811 A JP 7-68124 A JP-A-5-322060 JP 2008-200552 A

  The present invention eliminates these conventional problems, and high daily and high humidity cycles are generated in a vertical or inclined hollow tube used in bridges and buildings used outdoors. Humidity adjustment device for long hollow tubes that suppresses humidity fluctuations with no power source, suppresses condensation and accumulated water, reduces deterioration of hollow tubes due to rust caused by large humidity changes, and maintains high durability Is to provide.

In addition, as another problem, when the space volume of the hollow tube controlled by the water vapor movement control device becomes large, the membrane area increases, and the range of the vertical movement of the surface temperature generated due to changes in weather also increases. As the size increases, the respiration phenomenon due to the expansion and contraction of the internal air in the protected space, which is a closed space, also increases, and the pressure resistance and durability of the membrane become a problem.
In order to suppress the progress of corrosion, it is important to prevent surface contamination due to foreign substances (salts, sulfides, etc.) that promote the corrosion reaction and to suppress moisture that causes the corrosion reaction rapidly.
Also, considering the tensile strength and deformation of the membrane, when applied to a large area, the waterproof permeable membrane itself is deformed, resulting in abnormal fluctuations in the amount of permeation and unpredictable temperature gradients. It is highly probable that it would be difficult to create a device with a large surface area. Another problem of the present invention is that even when the internal space of the hollow tube for humidity adjustment becomes a large capacity, the membrane can be reliably secured over a long period of time by controlling the movement of water vapor within an appropriate membrane strength. There is.

The configuration of the present invention that solves this problem is as follows.
1) A humidity adjusting device for an internal space of a non-open long hollow tube installed vertically or obliquely outdoors, and is provided with a plurality of air passages formed so as to communicate the inside of the hollow tube and the outside air. An upper humidity fluctuation suppression device is installed at the top end of the hollow tube to prevent humidity fluctuations in the tube according to the membrane characteristics by arranging the waterproof water vapor permeable membranes separated by a predetermined distance, and is hollow except for the upper humidity fluctuation suppression device Airtight inside the tube, non-ventilated felt drainage that drains the water in the tube to the outside by capillarity at the bottom end to form a non-vented drainage channel, the inside of the hollow tube is an upper humidity fluctuation suppression device The water vapor permeable membrane and drainage body prevent atmospheric dust, rainwater and insects from entering, and suppress large fluctuations in the humidity inside the hollow tube to suppress deterioration due to humidity fluctuations in the hollow tube. Humidity adjustment device 2 for the internal space of long hollow tubes to increase durability ) At the bottom end of the hollow tube, a lower humidity fluctuation suppression device is also provided at the lower end of the hollow pipe, which is arranged with a plurality of waterproof water vapor permeable membranes separated by a predetermined distance in the air passage that communicates with the outside air. The humidity adjusting device for the internal space of the long hollow tube described in 1) above, wherein a non-venting felt drainage body is provided inside the lower humidity fluctuation suppressing device to form a non-venting drainage channel. The humidity fluctuation suppression device is provided with many small-diameter communication holes on the outer peripheral surface of a hollow covered cylindrical cap body attached to the uppermost tube opening of the hollow tube, and one end is connected to the communication hole and the other end is the atmosphere. A small humidity fluctuation suppressor provided with a plurality of waterproof water vapor permeable membranes separated by a predetermined distance in the air passage inside the small-diameter communication tube provided so as to communicate with each other is attached airtightly and horizontally to each communication hole, In addition, wind and rainwater is directly outside the small humidity fluctuation suppressor. The humidity adjusting device for the internal space of the long hollow tube as described in 1) or 2) above, wherein a mesh net for preventing contact is provided on the outer side of the covered cylinder, and the outside is further protected by a mantle having a ventilation space. It is in.

According to the present invention, when the water vapor inside the hollow tube is high humidity by the upper humidity fluctuation suppressing device at the uppermost end of the hollow tube, the water vapor inside the hollow tube is discharged to the atmosphere, and when the moisture is low, The water vapor on the side is moved into the hollow tube to suppress fluctuations in humidity within the hollow tube. And when discharging | emitting water vapor | steam with the uppermost upper humidity fluctuation | variation suppression apparatus, the water vapor | steam in a hollow tube tends to raise the inside of a hollow tube, the humidity of upper space becomes higher, and is discharged | emitted rapidly.
As a result, even if the humidity in the hollow tube exceeds 80%, the relative humidity can be quickly reduced to 80% or less, and when the humidity is significantly lower than 50%, the humidity can be increased to a value close to 50%. , Suppresses humidity fluctuations in the hollow tube, thus reducing the occurrence of corrosion due to large humidity fluctuations, suppressing fluctuations in the concentration of condensed water and water vapor, and suppressing the diffusion of moisture into the material where the corrosion reaction has started. Suppresses the occurrence of
Also, the water accumulated at the bottom of the hollow tube can be drained out of the hollow tube by a non-breathable felt drainage body, resulting in high humidity, the generation of rust due to water and the deterioration of the hollow tube.
Furthermore, rainwater, dust, salt, volcanic ash, yellow sand, and insects are blocked by the waterproof water vapor permeable membrane of the upper humidity fluctuation suppression device and the non-ventilated drainage body so as not to enter the hollow tube.

The uppermost upper humidity fluctuation suppressing device has a structure in which a large number of small holes are provided on the outer peripheral surface of a covered cylindrical cap body attached to the uppermost end of the hollow tube, and a large number of small humidity fluctuation suppressors are provided in each small hole. In this case, the small humidity fluctuation suppressor has a small inner diameter, so that it does not deform so that the membrane swells greatly with air pressure, can have high pressure resistance, and can be used even in the case of a large volume hollow tube internal space. Yes.
In addition, in the case where mesh nets and mantles are provided around the periphery of these small humidity fluctuation suppressors, make sure that rainwater, wind, insects, dust, volcanic ash, and yellow sand do not directly contact these small humidity fluctuation suppressors. The influence is reduced.

FIG. 1 is an explanatory diagram showing the overall arrangement of the embodiment. FIG. 2 is an exploded explanatory view of the cap body and the fixing plate of the upper humidity fluctuation suppressing device of the embodiment. FIG. 3 is a longitudinal sectional view of the upper humidity fluctuation suppressing device of the embodiment. FIG. 4 is an explanatory view showing a mounting state of the small humidity fluctuation suppressor of the embodiment. FIG. 5 is a vertical cross-sectional view of the small humidity fluctuation suppressor of the embodiment. FIG. 6 is a vertical cross-sectional view of the lower and middle humidity fluctuation suppressing device. FIG. 7 is an explanatory view showing an example of attachment to an oblique hollow tube. FIG. 8 is a schematic diagram showing the change over time in the mass of water vapor transferred by the permeable membrane. FIG. 9 is an explanatory diagram showing the water vapor transfer mass ratio by the permeable membrane. FIG. 10 shows the permeation mass in the direction from the nonwoven fabric surface of the permeable membrane to the water repellent surface, and the change in permeation characteristics as water vapor transfer mass over time of three types of membranes from 98 → 65% RH and 50 → 65% RH. It is explanatory drawing which shows.

In the present invention, the upper humidity fluctuation suppressing device attached to the hollow tube at the uppermost end position so as to communicate with the inside of the hollow pipe may be one or plural, or a plurality of small humidity fluctuation suppressing devices may be assembled.
The small humidity fluctuation suppressor provided at the uppermost end of the hollow tube is preferably installed horizontally.

If the humidity fluctuation suppressing device or the humidity fluctuation suppressing device with a non-ventilated drainage body is also attached to the lowermost end and the middle position of the hollow tube, the ability to further suppress the fluctuation of humidity becomes higher.
This is because the flow path of the fluid in the pipeline is heat transfer to the air due to the difference in wind speed between the high and low altitude areas, and the surface temperature of the pipeline due to the large heat of vaporization caused by wind after rain. This is an intermediate leak point for preventing an increase in humidity and condensation due to a decrease in temperature. The attachment position of the intermediate part is the buoyancy generated by the saturated water vapor pressure calculated in consideration of the actual measurement data in the pipe and the turbulent flow in the hollow pipe by the air via the intermediate humidity fluctuation suppression device attached to the intermediate part The ratio of the dry air that flows in due to the occurrence of this is effectively arranged to facilitate the increase in the exhaust direction.
Further, the non-breathable felt drainage body at the lowermost end of the hollow tube may be provided integrally in a humidity fluctuation suppressing device provided at the lowermost end.

  As a waterproof permeable membrane used in the humidity fluctuation suppressing device and small humidity fluctuation suppressor provided in the upper, lower or middle part, the outside air side is composed of a waterproof permeable membrane composed of a hygroscopic nonwoven fabric, and the inside is outside air It consists of a waterproof permeable membrane that is more permeable than the side, and the intermediate membrane is a waterproof permeable membrane that is more permeable than the inner and outside air sides, and the degree to which the water vapor transfer property changes over time However, a combination of membranes in which the magnitude relationship does not change for a certain period of time is used.

  Furthermore, it is preferable to provide a conductive porous mesh in the vicinity of the waterproof permeable membrane. This mesh (conductive porous body) is placed in the vicinity of the membrane, homogenizing the temperature change in the vicinity of the membrane, homogenizing the direction of movement of water vapor, supporting and reinforcing the membrane, and the oligodynamic effect of copper Thus, the surface of the membrane is prevented from being soiled by bacteria and fungi.

  The present invention will be described with an embodiment in which a substantially vertical main column steel pipe of a building exceeding 100 m is implemented as a hollow pipe.

  In this embodiment, a lidded cylindrical metal cap body is attached to the opening at the uppermost end of a hollow pipe, which is a main pillar steel pipe of a building, so that the opening and the inside of the cap body communicate with each other. A large number of small holes having small diameters are provided along the small holes. A small humidity fluctuation suppressor is horizontally attached to each small hole, and a mesh net and a mantle are attached to the outer periphery of the small humidity fluctuation suppressor. Furthermore, an intermediate / lower humidity fluctuation suppression device is provided in the middle and lower end of the hollow tube with the membrane part of the air passage reinforced by the small humidity fluctuation suppressor, and the middle / lower humidity fluctuation suppression device has a capillary phenomenon. Is provided with a non-breathable felt drainage body that drains to the outside, and a non-ventilated drainage channel is formed inside.

  1, 2, 3, 4, and 5, T is a main pillar of a building of 100 m or more, W is an upper humidity fluctuation suppressing device attached to the uppermost end of the hollow tube 1, and L is a steel pipe that is a main pillar. Lower humidity fluctuation suppression device formed inside a middle drainage body attached to the lowermost end of the empty pipe 1, M is an intermediate humidity fluctuation suppression device formed inside a middle drainage body attached in the middle of the hollow tube 1 is there.

  1 is a hollow tube made of steel pipe connected by a flange having an inner diameter of 30 cm and a height of 100 m or more, and 1a and 1b are flange portions of the hollow tube 1, and 2 is a concrete foundation of the main column T. 10 is a covered octagonal cylindrical cap body having an inner diameter of 30 cm of the upper humidity fluctuation suppressing device W, 10a is a flange portion of the cap body, and 10b is a single vertical column provided on each outer peripheral surface of the octagonal cylinder of the cap body 10. 96 small holes with steps provided on each of the eight surfaces in a ratio of six rows on one side, 10c are bolt holes for connecting to the uppermost flange portion 1a of the hollow tube 1 provided on the flange portion 10a Reference numeral 10d denotes a packing that hermetically connects the flange portions 1a and 10a, and also has a function of thermally insulating the hollow tube 1 from heat. 10e is a screw hole on the upper surface, 10f is an internal space of the cap body 10, 11 is a small humidity fluctuation suppressor having an inner diameter of about 32 mm and an outer diameter of about 36 mm attached to each small hole 10b, and 11a, 11b, and 11c are small humidity. It is a waterproof permeable membrane of the air passage in the fluctuation suppressor 11, the outside air side is made of a waterproof permeable membrane composed of a hygroscopic nonwoven fabric, and the inside is made of a waterproof permeable membrane having higher permeability than the outside air side. The intermediate membrane is a waterproof permeable membrane that is more permeable than the inside and outside air, and the degree to which the water vapor transfer characteristics change over time changes in magnitude when the order is constant for a certain period of time. Do not use a combination membrane.

  11d is a communicating tube of a casing having the inside of the small humidity fluctuation suppressor 11 as a ventilation passage, 11e is a mesh of a conductive porous body provided close to the intermediate waterproof permeable membrane 11b, 11f is a waterproof permeable membrane 11a, 11 b is an outer chamber defined by 11 b, 11 g is an inner chamber defined by the waterproof permeable membranes 11 b and 11 c, 11 h is a packing that abuts against the inner wall surface of the small hole 10 b, and the small hole 10 b is a small humidity fluctuation suppressor. 11 is an air passage that communicates the outside air-side space 15c, the cap body 10, and the lumen 10f.

  Reference numeral 12 denotes a vertically long fixed plate that holds the outer peripheral portion of the six vertical two rows of small humidity fluctuation suppressors 11 on the outer peripheral surface of the cap body 10, and 12a is the same that connects the small humidity fluctuation suppressor 11 and the outside air side space 15c. A stepped locking hole for locking the outer edge of the small humidity fluctuation suppressor 11 provided on the inner surface of the fixing plate, 12b is a mounting screw with a spring 12c for fixing the fixing plate 12 to the outer peripheral surface of the cap body 10, 12c is a spring that urges the fixing plate 12 and the mesh net 13 toward the cap body 10, and 13 is arranged on the outer periphery of the fixing plate 12, and is attached to the fixing plate 12 with a spacer 12e with a connection screw 12d, This is a vertically long mesh net that prevents wind, water, etc. and radiant heat from the outer jacket 14 described later from directly affecting the small humidity fluctuation suppressor 11. Although the mesh net 13 and the fixed plate 12 in the drawing are arranged in parallel, for example, the upper part is narrow and the lower part may be wide so that the adverse effects from radiant heat and wind and rain may be broken. 14 is a metal outer jacket that is attached to the outside of the mesh net so that the entire mesh net, a small humidity fluctuation suppressor, and the cap body are covered, 14a is a mounting screw that attaches the outer jacket to the upper surface of the cap body 10, and 14b is heat insulating. 15a, 15b and 15c are ventilation passages, 17 is a drainage drainage groove provided at the lower end attached to the outside of the flange portion 10a and a draining plate for preventing freeze breakage, and 18a, 18c and 18c are metal jackets 14 This is a ground wire for electrical grounding for lightning protection connecting the cap body 10 and the hollow tube 1.

Reference numerals 20a to 20k are components common to the lower humidity fluctuation suppressing device L and the intermediate humidity fluctuation suppressing device M, and have the same air passage and membrane structure as the small humidity fluctuation suppressing device 11, and the small humidity fluctuation suppressing device 11 is used. Is a medium-sized one having an outer diameter of 47 mm. Reference numerals 20a, 20b, and 20c are waterproof permeable membranes having the same inner diameter as the waterproof permeable membranes 11a, 11b, and 11c of the small humidity fluctuation suppressor 11. 20d is a communication cylinder as a casing, 20e is a conductive porous mesh provided in the vicinity of the waterproof permeable membrane 20b, 20f is an outer chamber defined by the waterproof permeable membranes 20a and 20b, and 20g is a waterproof permeable membrane. 20 h is an inner chamber defined by 20 c, 20 h is a communication pipe that connects the internal space of the hollow tube 1 and the communication cylinder 20 d of the lower / intermediate humidity fluctuation suppressing devices L and M, and 20 i is a felt capillary action and water. A non-breathable drainage body 20k is moved, and 20k is a drainage channel formed in the peripheral wall of the communication cylinder 20d.
In addition, the reinforcement mesh of the film | membrane is provided and it is strengthened rather than the small small humidity fluctuation suppressor 11 of the upper part.

Felt drainage 20i is made almost neutral by adjusting the pH of an emulsion that has been subjected to antiseptic and insecticidal treatments using tannic acid as a preservative for long-chain proteins such as agar or oblate on the fibers in the felt. The surface of the felt that was impregnated with the colloidal liquid and dried was covered with a film-like water-soluble paste such as Arabic glue.
When the whole is hardened with a paste such as Arabian glue, it takes a long time to swell and disintegrate even if it comes into contact with moisture after being cured and dried contained in the felt. By the way, in order to destroy the airtightness at an early stage in contact with moisture and to ensure water permeability, the outermost coating (arabic glue coating) is made faster by utilizing the swelling of protein chains that have entered the felt. It can collapse (within 3 minutes) and promote drainage.
In this drainage mechanism, after the drainage function is activated, the felt material has an air filter effect even after the glue and the protein in the felt are partially eluted, and the foreign matter is introduced into the protective space. Intrusion is prevented and a ventilation path is formed, but the movement of water vapor is limited. The material of the felt material is arbitrary, such as polyester cotton, nylon, synthetic fiber, and natural fiber, but a material having high weather resistance is preferable. A material with low hygroscopicity is more convenient for drying the colloidal liquid, is easy to manufacture, and is stable.

  When the hollow tube 1 is inclined, as shown in FIG. 6, the large humidity fluctuation suppressor 11 is arranged horizontally so that water does not easily adhere to and accumulate on the outside of 11a and 11c. You may arrange | position the auxiliary | assistant inclination ring 19 for arrange | positioning so that a capacity | capacitance type water vapor movement control apparatus may be arrange | positioned horizontally.

The outer jacket 14 of the upper humidity fluctuation suppressing device W is covered with a conductive material or made of a conductive constituent material, and is electrically connected to the ground wire 18a, 18b, 18c and grounded to the hollow tube 1. . As a result, burnout due to direct lightning is prevented.
The outer jacket 14 prevents strong wind, rainwater, dust and sunlight such as ultraviolet rays from directly hitting the small humidity fluctuation suppressor 11. It is further covered with a mesh net 13 on the inside, and has a structure in which water droplets are less likely to stagnate. As a result, even when the wind speed on the ground is 2 m / sec, it frequently occurs when the altitude is 60 m at a high altitude, such as 8 m / sec. It can be prevented that the surface temperature fluctuates abnormally and the water vapor movement is adversely affected.

The design of the mesh net 13 disposed under the outer cannula 14 to reduce the wind force under the outer cannula 14 is arbitrary, and in the embodiment, the arrangement of the punch holes is arbitrary such as a stacked arrangement, and a plurality of porous holes The mesh may be formed from a punched plate, and a plurality of these porous meshes may be arranged at a distance.
Further, the space 15c may not be parallel to the fixed plate.

  The lowermost and middle humidity fluctuation suppression devices L and M have an action of promoting the discharge of water vapor due to the generation of turbulent flow in the drainage or pipes. The outermost mantle 14 is shaded and protected from rain, and the rim-like draining plate 17 inside the mantle 14 is a turbulent levee.

  The fixing plate 12 is pressed against the cap body 10 by a mounting screw 12b and a spring 12c via a packing 11h in a stepped small hole 10b provided on the outer peripheral surface of the cap body 10 at the outer periphery of the small humidity fluctuation suppressor 11. Is done. The mesh net 13 and the fixing plate 12 are fixed to each other with a spacer 12e by a connecting screw 12d. These are penetrated by the mounting screw 12b, and the small humidity fluctuation suppressor 11 is pressed by the spring 12c in the direction of the cap body 10 through the packing 11h in the stepped small hole 10b.

  If a lightning strike occurs at the top of the hollow tube 1 of the building, the internal pressure of the hollow tube interior 1c and the internal space 10f of the cap body 10 suddenly rises and excessively increases in the small humidity fluctuation suppressor 11. The small humidity fluctuation suppressor 11 slides and floats in the stepped small hole 10b so that no pressure is applied, and sudden pressure changes in the internal space 1c of the hollow tube 1 and the internal space 10f of the cap body 10 occur. Is buffered by a leak and prevents damage to the inside of the small humidity fluctuation suppressor 11. Although not shown in the figure, a pressure change detection sensor having the same diameter as 11 can be arranged to detect a pressure abnormality.

The annular draining plate 17 is inside the outer jacket 14 and is fixed to the flange portion 10 a of the cap body 10. Between the outer sheath 14 and the flange of the cap body 10, there is an annular air passage 15a with a gap of about 5 mm.
The movement of the water vapor passes through the membrane 11a, 11b, 11c and the small chambers 11f, 11g, which are the ventilation passages of the small humidity fluctuation suppressor 11, via the inner space 10f of the cap body by the hollow tube inside 1c, and the mesh net. 13 and the fixed plate 12 through the mesh net 13 from the air passage 15c to the air passage 15b on the inner side of the outer jacket 14, and diffused into the atmosphere from the air passage 15a. The draining plate 17 prevents the action of stirring the direct wind from the mantle 14 and the direct blowing of wind and rain to the small humidity fluctuation suppressor 11, and improves the water vapor movement characteristics of the small humidity fluctuation suppressor 11. Reduce adverse effects.

Further, a heat resistant heat insulating material may be disposed in the gap d between the fixed plate 12 and the cap body 10.
The outer jacket 14 is attached to the top of the cap body 10 with a mounting screw 14a, but the screw hole 10e does not penetrate the top of the cap body 10 and water leakage does not occur.
The mesh net 13 has a high wind speed of 8 to 10 m / sec at a wind speed of about 2 m / sec or 50 m on the ground, and is often 8 to 10 m / sec. In this case, a rapid temperature fluctuation of the small humidity fluctuation suppressor 11 can be avoided, so that the performance and the durability can be stabilized.

The mantle 14 forms a sun shield and a ventilation passage 15a between the flange portions 10a of the cap body 10 and forms a small annular slit 15a that prevents strong wind and heavy rain from entering the mantle 14.
The material of the outer jacket 14 is made of metal, but the inner surface is coated with a heat-resistant heat-insulating coating to prevent adverse effects due to radiant heat from the outer jacket 14 to the small humidity fluctuation suppressor 11, and the inside of the outer jacket 14 is exposed to ultraviolet rays. Protect from.
Further, a heat insulating material for insulating radiant heat may be disposed on the outer periphery of the mesh net 13 under the outer jacket 14.

  In this embodiment, the water vapor in the hollow tube 1 is controlled to move mainly by the upper humidity fluctuation suppressing device W and secondarily by the lower humidity fluctuation suppressing device L and the intermediate humidity fluctuation suppressing device M. The humidity fluctuation is approximately 80% RH or less, and the lower part is suppressed to a humidity close to 50% RH.

  In the upper humidity fluctuation suppressing device W, the water vapor tends to gather together with the upward flow, but the water vapor enters the cap body 10 having an inner diameter of 30 cm at the uppermost end of the hollow tube 1. This water vapor acts to reduce the humidity fluctuation in the hollow tube 1 by 96 small humidity fluctuation suppressors 11 having an inner diameter of about 32 mm provided horizontally on the outer peripheral surface of the cap body 10, and to the outside air side. Promotes water vapor diffusion. Similarly, in the lower and middle portions of the hollow tube 1, the medium-sized humidity fluctuation suppression devices L and M having an outer diameter of 47 mm also reduce humidity fluctuations to generate turbulent flow and efficiently promote the discharge of water vapor. .

  The action of moisture fluctuation suppression by the water vapor movement control of the small humidity fluctuation suppressor 11 and the middle and lower middle-sized humidity fluctuation suppression devices L and M is the same as that of the waterproof permeable membranes 11a, 11b, 11c, 20a, 20b and 20c. This is due to action. Hereinafter, the phenomenon of humidity suppression will be described.

An air passage that communicates the inside of the hollow tube with the outside air is divided into two small chambers from the moving boundary surfaces of these three types of waterproof permeable membranes, and heat exchange is performed between these spaces. The movement phenomenon is limited by the film, and the heat exchange at the movement boundary surface is performed in the movement direction with a tendency to change the isobaric pressure. In this process, a propagation loss of kinetic energy occurs.
This heat transfer is the same in the reverse direction, but the pressure on the atmosphere side does not change because the volume is not limited as shown in FIG. Therefore, the movement from the hollow tube side to the atmosphere side is caused by the difference in water vapor pressure between the hollow tube and the atmosphere, and the movement is likely to continue until the water vapor pressure in the atmosphere side and the hollow tube becomes equal, and the movement toward the atmosphere. Easy to move.
Similarly, when the water vapor pressure is higher on the outside air side than in the hollow tube, the water vapor moves toward the hollow tube. However, this moving direction results in an increase in pressure inside the hollow tube and requires a clear amount of work. In addition, the work pressure for increasing the pressure inside the hollow tube and the pressure from the intermediate permeable membrane to another permeable membrane is required, but it is suppressed because there is a propagation loss of thermal energy. As a result, the inside of the hollow tube is less likely to have a higher water vapor pressure on the outside air side than the inside of the hollow tube, and the contradiction in the pressure difference is stabilized by the movement of the air instead of the movement of the water vapor. This phenomenon is similar to the reverse osmosis phenomenon as a result.
In the specific progress of the movement of water vapor, the heat propagation from the hollow tube internal space is caused by the buoyancy of the water vapor in the direction of the outside air from the assembly of the small humidity suppressors 11 of the upper humidity fluctuation suppressing device at the top. It is discharged as a parallel circuit.
In the lower or middle humidity fluctuation suppression devices L and M, the effect of hindering the movement of water vapor from the outside air to the protection space is expected, so the membrane portion is reinforced. As a result, the dehumidified air flows into the protection space and prevents the entry of foreign matter in the external airflow.

In order to explain the amount of movement of the boundary surface that forms the difference in the amount of water vapor movement, FIGS. 8 and 9 are schematic views showing the ratio of the amount of permeation of the permeable membrane in the air passage.
In addition, in order to determine the amount of water vapor movement, the pressure inside the hollow tube is set to 1, and the water vapor movement changed over time based on the result of precise measurement of the amount of water vapor movement under isothermal isobaric pressure. Assuming the case where the top three of the mass diagram 8 are theoretically combined, the transmission amount is obtained by simply calculating the ratio.
In FIG. 10, the permeation | transmission mass of the water-repellent surface direction from the nonwoven fabric of a film | membrane is shown. This result shows the permeation | transmission mass of the water vapor | steam from a nonwoven fabric to a water-repellent surface direction. As for the change in the amount of movement in the reverse direction, in the case of the membrane, the nonwoven fabric having a larger surface area faces the outside air, the movement speed becomes faster, but the influence of temperature tends to increase.
However, in general, the amount of movement of water vapor from the nonwoven fabric in the direction of the water-repellent surface and the amount of movement from the water-repellent surface to the nonwoven fabric surface may be substantially equal. It is desirable to arrange these directions in consideration of the surface contamination of the film and the temperature change of the surface.

  In particular, in the upper humidity fluctuation suppressing device W of the present embodiment, the inner diameter of the cap body is 300 mm, the inner diameter of the small humidity fluctuation suppressor 11 is 32 mm, about 1/10 of the diameter, and about 1/100 in area. Therefore, the pressure resistance against the pressure of the permeable membrane can be used without any problem.

  As described above, without the apparatus of the present embodiment, even when the humidity in the intermediate pipe 1 in the steel tower changes from 90% RH to 40% RH in one cycle per day, the humidity is 80% RH. The lower one can also be close to 50% RH, greatly reducing the humidity fluctuation range, suppressing the occurrence of condensation in the hollow tube, preventing surface contamination in the pipe, and rusting and corrosion inside the hollow tube The lifespan can be extended by reducing

  INDUSTRIAL APPLICABILITY The present invention can be used for deterioration due to humidity in a vertical pipe installed in a building as well as a hollow pipe of a main pillar of an outdoor bridge / building.

T Main pillar W Upper humidity fluctuation suppression device L Lower humidity fluctuation suppression device M Intermediate humidity fluctuation suppression device 1 Hollow tube d Gap 1a, 1b Flange 1c Internal space 2 Concrete foundation 10 Cap body 10a Flange 10b Small hole 10c Bolt hole 10d Packing 10e Screw hole 10f Inner space 11 Small humidity fluctuation suppressor 11a, 11b, 11c Waterproof permeable membrane 11d Communication cylinder 11e Mesh 11f Outer small chamber 11g Inner small chamber 11h Packing 12 Fixing plate 12a Locking hole 12b Mounting screw 12c Spring 12d Screw 12e Spacer 13 Mesh net 14 Mantle 14a Mounting screw 14b Heat insulating material 15a, 15b, 15c Air passage 17 Drain plate 18a, 18b, 18c Ground wire 19 Auxiliary inclined ring 20a, 20b, 20c Waterproof permeable membrane 20d Passing tube 20e meshes 20f outer chamber 20g inner chamber 20h communicating pipe 20i drainage body 20k drainage

Claims (3)

  A humidity control device for the internal space of a non-open long hollow tube installed vertically or obliquely outdoors, and a plurality of waterproofs in an air passage formed to communicate the inside of the hollow tube with the outside air An upper humidity fluctuation suppression device is installed at the uppermost end of the hollow tube to suppress humidity fluctuations in the tube according to the membrane characteristics by separating the water vapor permeable membrane by a predetermined distance, and inside the hollow tube except for the upper humidity fluctuation suppression device The bottom end is provided with a non-breathable felt drainage body that drains the water in the pipe to the outside by capillary action to form a non-ventilated drainage channel. The permeation membrane and drainage body prevent atmospheric dust, rainwater and insects from entering, and suppress large fluctuations in the humidity inside the hollow tube, thereby suppressing deterioration due to humidity fluctuations in the hollow tube and durability of the hollow tube Increase the humidity of the internal space of the long hollow tube.   The lower end of the hollow tube is also provided with a lower humidity fluctuation suppression device that arranges a plurality of waterproof water vapor permeable membranes at predetermined intervals in an air passage communicating with the outside air to suppress humidity fluctuations in the tube according to the membrane characteristics. The humidity adjusting device for an internal space of a long hollow tube according to claim 1, wherein a non-breathable felt drainage body is provided inside the humidity fluctuation suppressing device to form a non-ventilated drainage channel.   The uppermost upper humidity fluctuation suppressing device is provided with many small-diameter communication holes on the outer peripheral surface of a hollow covered cylindrical cap body attached to the uppermost tube opening of the hollow tube, and one end is connected to the communication hole. A small humidity fluctuation suppressor provided with a plurality of waterproof water vapor permeable membranes separated from each other by a predetermined distance in an air passage inside a small-diameter communication tube provided so that the other end communicates with the atmosphere is airtight in each communication hole and A structure in which the mesh net is installed on the outer side of the covered cylinder and is further protected by a mantle having a ventilation space. The humidity adjusting device for the internal space of the long hollow tube according to 1 or 2.

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