JP6460734B2 - Air exposure test container and air exposure test equipment - Google Patents

Description

  The present invention relates to an atmospheric exposure test container and an atmospheric exposure test apparatus, and more particularly to an apparatus for a shielding exposure test.

Bridges and other steel structures are required to consider the weather resistance and corrosion resistance in an open air environment.
For evaluation of these weather resistance and corrosion resistance, Japanese Industrial Standard JISZ2381 “General Rules for Atmospheric Exposure Test Methods” (Non-patent Document 1) is used.

  In structures such as bridges, the outer surface is exposed to sunlight and wind and rain, and therefore, evaluation by the “direct exposure test” is preferable among the above-mentioned standards. On the other hand, the underside and inside of the bridge girder are not easily exposed to sunlight or wind and rain, and residual salinity on the surface of the structure affects the weather resistance. Therefore, the “shield exposure test” is preferred because it can avoid the influence of wind and rain that causes these residual salts to be washed away.

In the shielding exposure test, an atmospheric exposure test apparatus in which a test piece as a test material is accommodated in an exposure container or an exposure stand having a desired shielding performance is used.
For example, it is known to use a patch made of a test material as a small rectangular plate as a test piece, use a housing similar to a 100-leaf box as an exposure container, and avoid the influence of wind and rain while providing ventilation. (Non-Patent Document 2).

Among them, the “cylindrical exposure container” described on pages 45 to 46 of Non-Patent Document 2 accommodates a emblem test piece in a small vinyl chloride container, and allows ventilation while avoiding direct exposure to wind and rain. Is to be obtained.
Such a compact atmospheric exposure test apparatus can be used by being attached to a high place such as a utility pole, and can be applied to various environmental exposure tests.

Japanese Industrial Standards JISZ2381: 2001 “General Rules for Atmospheric Exposure Tests”, Japanese Standards Association “Applicability assessment and anti-corrosion preventive safety of weather-resistant steel bridges” September 2009, Japan Steel Structure Association

  The exposure test apparatus described in Non-Patent Document 1 described above is an apparatus in which a large number of small test pieces are installed on an internal frame in a relatively large, substantially rectangular parallelepiped cover. However, since the angle of the top plate of the cover is not specified, there is a problem that test results vary due to condensation from the bottom surface of the top plate. In addition, since a relatively large test device is used, the top plate swells during production, and the results vary further depending on the position of the test piece. Further, the installation height of the test piece is not specified, and the test device is covered. Since the shape of the is square, there is a problem that the influence of the wind differs depending on the installation position of the test piece in addition to the influence of the wind depending on the apparatus.

  Also, in the test using a housing similar to the above-mentioned 100-leaf box, the condensation and rainwater adhering to the kite during strong winds such as typhoons enter the housing by the wind and adhere to the test piece, resulting in large variations in test results. There's a problem.

In the cylindrical exposure container described above, the four corners of the emblem test piece are suspended and supported by wires along the upper surface opening of the truncated cone-shaped cylinder, and the upper surface side is further covered with a cylindrical cover, so that direct wind and rain can be prevented. Avoid exposure.
However, depending on the climatic conditions, condensation may form on the inside of the cover, and this condensed moisture may drip and hit the test piece.
If the adhering salt on the surface of the test piece is washed away due to such water dripping, there is a possibility that an appropriate test result cannot be obtained. Furthermore, when moisture dripping is limited to a specific part, the result of comparison with other surrounding test pieces may not be appropriate, and a highly reliable result could not be obtained.

  An object of the present invention is to provide an atmospheric exposure test container and an atmospheric exposure test apparatus in which the container is compact and can avoid the effects of moisture condensation and wind direction.

The atmospheric exposure test container of the present invention has a cylindrical main body that accommodates a test body, and a hood that covers the upper surface side of the main body, and the lower surface of the hood has a region with an inclination angle of 30 degrees or more with respect to a horizontal plane. The test body is formed in a plate shape having a test material on the surface thereof, and the test body is horizontal from the side inside the main body. And the lower surface thereof is arranged at the height of the lower end of the main body.

  In the present invention, the test body supported inside the main body can be covered with a hood and used as a shielding exposure test. At this time, the lower surface of the hood, that is, the inner surface facing the test body is inclined at an angle of 30 degrees or more with respect to the horizontal plane, and condensation is generated on this surface, so that the water droplet grows and drops. Even if it reaches, this water droplet flows down along the inclined lower surface. Therefore, even if condensation occurs on the lower surface of the hood, it can be prevented from dripping as water droplets, and the influence of moisture condensation on the specimen can be eliminated.

The shape of the hood of the present invention can be conical or pyramidal. The hood may have a hemispherical shape, a shape obtained by extending the hood vertically, a truncated cone shape, or the like.
A cylindrical support portion having a smaller diameter than the main body may be formed at the tip of the hood. Alternatively, a small-diameter hemisphere may be formed at the tip of a conical or pyramidal hood.

In a part of these shapes (such as a hemispherical shape or a truncated cone shape), an area that is not inclined at 30 degrees or more with respect to the horizontal plane is generated in a part around the apex. However, if such a region is 20% or less of the entire planar shape of the hood, water droplets can flow down to the surrounding inclined surface and can be used as the hood of the present invention.
These shapes are the same when the hood is formed of a normal plate material, but the inner surface side and the outer surface side are the same shape.For example, a conical plate material is installed on the inside to form the inner surface, and a cylindrical plate material is formed on the outside. It may be installed to form the outer surface. In this case, the inclination angle of the inner surface is set to 30 degrees or more regardless of the outer shape.

In the present invention, the test body is formed in a plate shape having a test material on the surface, and is supported horizontally from the side inside the main body, and the lower surface thereof is disposed at the height of the lower end of the main body. Therefore, the dew condensation generated on the inner surface of the hood is not transmitted to the test body but drops downward.
And since the said test body is covered by the cylindrical main body, it can prevent rain and also the influence of the vortex etc. resulting from a wind direction. Furthermore, since the lower end of the test body is coincident with the lower end of the main body, it is possible to set a wind and rain exposure environment similar to the lower flange of the bridge using H steel or the like. Therefore, an exposure test environment that is closer to reality can be obtained.

  In addition, as a plate-shaped test body, the existing test piece which stuck the emblem of the test material on the surface of a plate-shaped base material can be used, and the plate-shaped test piece formed entirely with the test material can be used. . It is desirable that the base material on which the patch is applied is insulative.

In the atmospheric exposure test container of the present invention, it is preferable that the test material is installed on an upper surface of the test body, and a drainage groove is formed on the upper surface of the test body along an outer periphery of the test material. .
In the present invention as described above, even when dew condensation occurs around the test body, the dew condensation water can be effectively drained by the drain groove, and the dew condensation water can be prevented from adhering to the test material.

In the atmospheric exposure test container of the present invention, the test material is installed on the upper surface of the test body, and the upper surface of the test body has a slope for drainage that decreases from the outer periphery of the test material toward the outer periphery of the test body. Is preferably formed.
In the present invention as described above, even when dew condensation occurs around the specimen, the dew condensation water can be effectively drained by the inclination of the test material, and the dew condensation water can be prevented from adhering to the test material.

  The atmospheric exposure test apparatus of the present invention has a plurality of the aforementioned atmospheric exposure test containers of the present invention.

In the present invention as described above, the measurement results under different conditions can be acquired simultaneously by individually adjusting the test material, shape, installation conditions, and the like of each specimen contained in a plurality of test containers.
At this time, since each test container is compact, for example, it is possible to select various installation forms according to the situation, for example, by arranging the test containers vertically and supporting them on a support column or by supporting them side by side.
Furthermore, since each test container is an atmospheric exposure test container according to the present invention, it is possible to avoid the influence of dew condensation on the inner surface of the container and the wind direction with respect to the test body accommodated in the main body.

  According to the atmospheric exposure test apparatus of the present invention, it is possible to obtain a highly accurate result by eliminating the influence of condensed water and wind direction while making a compact container. You can get the environment.

The side view which shows the atmospheric exposure test apparatus in one Embodiment of this invention. The longitudinal cross-sectional view which shows the test container of the said embodiment. The cross-sectional view which shows the test container of the said embodiment. The top view (A) and longitudinal cross-sectional view (B) which show the groove | channel for drainage formed in the test body. The top view (A) and longitudinal cross-sectional view (B) which show the inclination and groove | channel for drainage formed in the test body. The typical perspective view which shows the modification of the food | hood of the said embodiment. The typical perspective view which shows the modification of the food | hood of the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, the atmospheric exposure test apparatus 1 of the present embodiment has two test containers 2 supported by a column 10.
The column 10 has a fixed plate 12 at the lower end of the column 11, and the fixed plate 12 is fixed by anchor bolts embedded in the foundation.

The test containers 2 are supported on the upper part of the support column 10 via the brackets 13 and are arranged side by side with each other.
In the present embodiment, the test container 2 is the atmospheric exposure test container of the present invention, and a plate-like test body 4 is accommodated therein.

As shown in FIG. 2 and FIG. 3, the test container 2 is a container in which a plate-shaped test body 4 is accommodated inside an air exposure test container 20.
The atmospheric exposure test container 20 includes a cylindrical main body 21 and a hood 22 that covers the upper surface side of the main body 21. The main body 21 and the hood 22 are formed of a weather-resistant and low-cost material such as vinyl chloride, and are integrally formed with each other.

The main body 21 is formed in a cylindrical shape.
The hood 22 has a conical part 221, a cylindrical part 222 connected to the upper end thereof, and a spherical part 223 connected to the upper end thereof.
The inner side of the conical part 221 of the hood 22, that is, the lower surface side, has an inclination angle of 30 degrees or more with respect to the horizontal plane.

The test body 4 is the same as an existing test piece, and a test patch 41 made of a test material is pasted on the front and back of a flat octagonal plate-like base material 42.
As the base material 42, for example, a plate material made of an insulating material which is hardly corroded, such as vinyl chloride resin or FRP (fiber reinforced plastic) is used.

The test body 4 should just be formed in the plate shape which has a test material on the surface, for example, the whole test body 4 may be formed with the test material.
The base material 42 is not an octagon, but may be a hexagon or more polygons or a circle. In short, it is desirable that the base material 42 be as close to a circle as possible so that the distance from the inner periphery of the lower surface opening surface of the cylindrical main body 21 does not vary depending on the orientation.
The base material 42 may be a normal rectangular plate material. For example, as long as the distance from the inner periphery of the lower surface opening surface of the cylindrical main body 21 is obtained to some extent, even if the base material 42 is square, the influence of the variation in the distance depending on the direction is less likely to occur.

The test body 4 is horizontally supported in the main body 21 from the side, and its lower surface is arranged at the height of the lower end of the main body 21.
The test body 4 is supported by four bolts 211.
The main body 21 is formed with through-holes 212 through which bolts 211 can be inserted at four intervals in the circumferential direction along the lower edge. The bolt 211 is inserted into the through hole 212 and the tip thereof is screwed into the female screw hole 421 of the base material 42.
The number of bolts 211 is not limited to four, and may be three. In this case, it may be installed at intervals of 120 degrees in the circumferential direction of the main body 21.

As shown in FIG. 4, a drainage groove 43 can be formed in the test body 4.
At this time, it is effective to provide the drainage groove 43 not only on the upper surface but also on the lower surface. That is, it is possible to prevent the condensed water generated on the outer periphery from reaching the inner test patch 41 on the lower surface of the test body 4.

As shown in FIG. 5, the upper surface of the test body 4 can be drained with an inclination 44.
By adopting such a configuration, even when the dew condensation is formed around the test body 4, the dew condensation water around the test body 4 is effectively drained to the outer peripheral side, and the dew condensation water around the test patch 41 adheres. Can be prevented.

In the example shown in FIG. 5, the slope 44 is provided on the upper surface of the test body 4, and the groove 43 is provided on the lower surface. Although not shown, the upper and lower surfaces of the test body 4 may be provided with an inclination 44. However, the slope 44 on the lower surface side is inclined upward toward the inner test patch 41 so that the dew condensation water generated around the test body 4 moves toward the outer periphery of the test body 4. Is desirable.
Furthermore, although illustration is omitted, the test body 4 can be used in combination with the slope 44 as shown in FIG. 5 and the groove 43 as shown in FIG.

According to this embodiment, the following effects can be obtained.
In the test container 2, the test body 4 was accommodated in the air exposure test container 20. For this reason, the test body 4 supported inside the main body 21 is covered with the hood 22 and can be used as a shielding exposure test.

At this time, the lower surface of the hood 22, that is, the inner side surface facing the test body 4 is inclined at an angle of 30 degrees or more with respect to the horizontal plane. Condensation occurs on this surface, and the water droplet grows and drops. Even if it reaches this point, this water droplet flows down along the inclined lower surface.
Therefore, even if condensation occurs on the lower surface of the hood 22, it can be prevented from dripping as water droplets, and the influence of condensed moisture on the test body 4 can be eliminated.

The test body 4 was formed in a plate shape having a test material on the surface, was supported horizontally from the side in the main body 21, and its lower surface was disposed at the height of the lower end of the main body 21.
With such an arrangement, dew condensation generated on the inner surface of the hood 22 is not transmitted to the test patch 41 and can be prevented from dripping downward. Furthermore, a wind and rain exposure environment similar to that of the lower flange of a bridge using H steel or the like can be set for the plate-shaped test body 4, and an atmospheric exposure test in a state close to actual conditions can be performed.

Furthermore, in this embodiment, since the test container 2 was supported side by side by the support column 10, the basic corrosion state at the installation point can be measured simultaneously.
Moreover, since the atmospheric exposure test container 20 itself is compact, the test container 2 can increase the degree of freedom of installation.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to embodiment mentioned above, The deformation | transformation etc. in the range which can achieve the objective of this invention are included in this invention.
For example, the shape of the hood 22 of the atmospheric exposure test container 20 is not limited to the shape of the above embodiment, and the inner surface, that is, the lower surface may have an inclination angle of 30 degrees or more with respect to the horizontal plane, and various shapes can be adopted. it can.
In addition, for example, instead of extending the column from the ground, it is also possible to install a test vessel by attaching a column etc. to an existing structure, or to attach other measurement equipment such as a flying salinometer or similar test vessel to the column Can be adopted.

  FIG. 6A shows the shape of the hood 22 of the above embodiment, which includes a conical portion 221, a cylindrical portion 222 connected to the upper end thereof, and a spherical portion 223 connected to the upper end thereof. In this shape, 90% or more excluding the central region of the spherical portion 223 has an inclination angle of 30 degrees or more with respect to the horizontal plane.

In FIG. 6B, the hood 22B has a conical portion 221B and a spherical portion 223B connected to the upper end thereof. Even in the case of such a hood 22B, if the area of the central portion of the spherical portion 223 where the oblique angle is not 30 degrees or more with respect to the horizontal plane is less than 20%, it can be used for the atmospheric exposure test container 20.
In FIG. 6C, the hood 22C is formed of a spherical portion 223C that is hemispherical as a whole. Even such a hood 22C can be used for the atmospheric exposure test container 20 if the central region where the inclination angle is not 30 degrees or more with respect to the horizontal plane is less than 20%.

Each form of FIG. 6 described above uses a curved surface such as a cone or a hemisphere, but may be a hood using an inclined plane.
In FIG. 7A, the hood 22D is composed of a pair of flat surfaces 221D, and the inclination angle of each flat surface 221D is 30 degrees or more with respect to the horizontal surface.
In FIG. 7B, the hood 22E is formed in a quadrangular pyramid shape, and the inclination angle of each of the four side surfaces 221E is 30 degrees or more with respect to the horizontal plane.
Such hoods 22D and 22E can also be used for the atmospheric exposure test container 20.

In the above embodiment, the main body 21 is cylindrical, that is, has a constant inner and outer diameter along the central axis. However, the main body 21 may be formed of a conical surface, and further, as a conical surface continuous with the hood 22. Also good.
In FIG. 7 (C), the atmospheric exposure test container 20 is a single conical member, the lower part is a main body 21 that accommodates the test body, and the upper part is a hood 22. You can also.

  In addition, as a structure for supporting the test body 4 in the atmospheric exposure test container 20, it is desirable to take into consideration that an insulating material is appropriately interposed in order to avoid corrosion due to electrical conduction.

  The present invention relates to an atmospheric exposure test container and an atmospheric exposure test apparatus, and can be used as an apparatus for a shielding exposure test.

DESCRIPTION OF SYMBOLS 1 ... Atmospheric exposure test apparatus 2 ... Test container 4 ... Test body 10 ... Support | pillar 11 ... Column 12 ... Fixed plate 13 ... Bracket 20 ... Atmospheric exposure test container 21 ... Main body 211 ... Bolt 212 ... Through-hole 22, 22B, 22C, 22D, 22E ... Hood 221, 221B ... Conical part 221D ... Plane 221E ... Side 222 ... Cylindrical part 223, 223B, 223C ... Spherical part 41 ... Test patch 42 ... Base material 421 ... Hole 43 ... Groove 44 ... Inclination

Claims (4)

It has a cylindrical main body that accommodates the test body, and a hood that covers the upper surface side of the main body, and the lower surface of the hood has an area with an inclination angle of 30 degrees or more with respect to a horizontal plane. % , The test body is formed in a plate shape having a test material on the surface, the test body is supported horizontally from the side inside the main body, and its lower surface is An atmospheric exposure test container, which is disposed at a height of a lower end of the main body. In the atmospheric exposure test container according to claim 1,
The test material is placed on the top surface of the test body, and a drainage groove is formed on the top surface of the test body along the outer periphery of the test material. In the atmospheric exposure test container according to claim 1 or 2,
The test material is installed on the upper surface of the test body, and the upper surface of the test body is formed with a slope for drainage that decreases from the outer periphery of the test material toward the outer periphery of the test body. Air exposure test container.   An air exposure test apparatus comprising a plurality of the air exposure test containers according to any one of claims 1 to 3.

Images