JP4537234B2 - Tide fence - Google Patents

Description

The present invention, in order to prevent salt damage caused by splashes soar from the coast during monsoon and strong wind moves inland on the wind, about the tide fence installed in coastal areas or near.

  Changes in the tide flow around the coast due to the development of the coastal area, and changes in the environment such as sea level rise due to warming cause the shoreline to recede and the sea level to rise, and seawater splashes in strong winds during seasonal winds and strong winds As a result, the phenomenon of falling over the breakwater and falling into private houses and facilities has been seen. For this reason, salt damage has occurred, such as corrosion of roofs in general houses, corrosion of air conditioner outdoor units, and corrosion of electric devices in factories and the like.

  In order to prevent salt damage caused by such splashes, the sea breeze has been conventionally shielded or attenuated by a windbreak fence or the like. For example, Patent Document 1 below describes that a corrugated plate having a large number of through holes is used as a windbreak plate as a part of a blow-off windbreak fence for snowstorm countermeasures. In addition, Patent Document 2 below discloses an overtopping / sand fence in which through holes are provided in the front and rear fence shielding plates arranged at regular intervals, and the positions of the through holes are shifted by the front and rear fences. Yes. According to this overtopping / sand fence, the direct fluid that has passed from the front by the shield part of the non-perforated part of the rear fence is secondarily applied to the rear fence, so that the splash is scattered from the through hole of the rear fence. Therefore, it is described that it is possible to prevent direct flight to traffic roads and harbor facilities.

Furthermore, a commercially available perforated folded plate (steel plate bent into a zigzag shape) is installed in a zigzag shape in the height direction, or a fine net is used as a tide fence.
Japanese Unexamined Patent Publication No. 64-21105 JP 59-206508 A

  However, when the corrugated plate having a large number of through holes described in Patent Document 1 or the perforated folded plate is used as a tide fence, an effect of reducing the wind speed is recognized. Since the amount of so-called sprayed splash that exceeds the fence increases, the effect of preventing splashing is not satisfactory.

  In addition, the wave overtopping / sand fence described in Patent Document 2 can directly reduce the amount of splash that passes through the through-hole, but the sea breeze that hits the shielding part also gets over the fence and splashes inland. As a result, it was not satisfactory as an effect of preventing splashing.

  Therefore, the main problem of the present invention is a tide fence that is installed at the coastal area or in the vicinity thereof, and prevents the splashes from splashing inland by catching and dropping the splashes scattered on the wind. In addition, it is possible to reduce the amount of splash passage through the fence, and at the same time, to provide a tide fence that has a higher scattering prevention effect than before by reducing the amount of spray splashing over the fence and splashing inland .

In order to solve the above-mentioned problem, the present invention according to claim 1 is installed at a coastal part or in the vicinity thereof, and the splashes are scattered to the inland side by catching and dropping the splashes scattered on the wind. A tide fence to prevent
The tide fence is arranged with at least two or more rows of rod-like bodies in which rod-like bodies are arranged at predetermined intervals so as to form a row in a direction facing the sea side, in a direction orthogonal to the direction facing the sea side. The rod-like body row on the front row side and the rod-like body row on the back row side are arranged in a staggered manner between adjacent rod-like body rows, and the cross-sectional shape of the rod-like body is a circle, a triangle, a rhombus, a semicircle, a cutout circle And is oriented in an orientation that does not have a plane opposite to the wind
The rod-like body interval of the rod-like body rows is set to four times the rod-like body width dimension in the direction facing the sea side, and the spacing between the rod-like body rows is orthogonal to the direction facing the sea side. There is provided a tide fence characterized in that it is set to be twice as large as the width of the rod-shaped body in the direction .

As the present invention according to claim 2, a tide fence for preventing the splash from splashing inland by catching and sinking and dropping the splash scattered on the wind, located at the coast or in the vicinity thereof. Because
The tide fence is arranged with at least two or more rows of rod-like bodies in which rod-like bodies are arranged at predetermined intervals so as to form a row in a direction facing the sea side, in a direction orthogonal to the direction facing the sea side. The rod-like body row on the front row side and the rod-like body row on the back row side are arranged in a staggered manner between adjacent rod-like body rows, and the cross-sectional shape of the rod-like body is a circle, a triangle, a rhombus, a semicircle, a cutout circle And is oriented in an orientation that does not have a plane opposite to the wind
The rod-like body interval of the rod-like body rows is set to three times the rod-like body width dimension in the direction facing the sea side, and the spacing between the rod-like body rows is orthogonal to the direction facing the sea side. There is provided a tide fence characterized in that the tide fence is set to 1.5 times the rod-shaped body width dimension in the direction .

In the first and second aspects of the present invention , the rod-like body row in which the rod-like bodies are arranged at predetermined intervals so as to form a row in the direction facing the sea side is perpendicular to the direction facing the sea side. At least two or more rows are arranged, and between the adjacent rod-like body rows, the rod-like body rows on the front row side and the rod-like body rows on the rear row side are arranged in a staggered manner, and the cross-sectional shape of the rod-like bodies is circular, triangular, rhombus , Semicircular, notched circular, elliptical, and crescent shaped, and oriented in a direction that does not have a plane facing the wind . Therefore, the wind is contracted by the row of rod-like bodies located on the front side with respect to the sea breeze, and collides with the rod-like body row on the rear side. Alternatively, the collision probability of the splash and the rod-shaped body is increased by causing the separation vortex of the wind generated by the row of rod-shaped bodies located on the front side to collide with the row of rod-shaped bodies located on the rear side.

  In addition, the separation vortex generated behind the rod-shaped body is formed of vortices of various scales, so that the droplets collide with each other when flowing downstream, and agglomerate into large-sized particles due to aggregation. By promoting, it is possible to prevent the splashes from scattering to the inland side.

  In other words, in the fence using a conventional perforated corrugated plate or a perforated folded plate, the amount of blow-up becomes large, and a negative effect is produced on sedimentation. However, in the present invention, the wind blows through the rod-shaped bodies. In the process of blowing through between the rod-shaped bodies, the probability of collision with the rod-shaped bodies and the probability of contact is increased, and the turbulent state is artificially created by the contraction and separation flow of the wind. By increasing the chance of contact with each other, the droplets are agglomerated, and by increasing the sedimentation velocity, the fence and the rear side of the fence are immediately dropped to the ground.

Further, in claim 1, the interval between the rod-like body rows is set to four times the rod-like body width dimension in the direction facing the sea side, and the interval between the rod-like body rows faces the sea side. The rod-like body width dimension in a direction orthogonal to the direction is set to be twice as long , and in claim 2, the rod-like body interval of the rod-like body row is 3 with respect to the rod-like body width dimension in the direction facing the sea side. The interval between the rod-like body rows is set to 1.5 times the rod-like body width dimension in the direction orthogonal to the direction facing the sea side. Since the wind and separation vortex contracted by the rods on the front row side show a certain degree of diffusion tendency, even if a certain amount of gap is generated, a desired effect can be obtained as an effect of preventing splashing of the splash. .

As described above in detail, according to the present invention, it is possible to reduce the amount of droplets passing through the fence, and at the same time, it is possible to reduce the amount of spray splashed over the fence and splashing inland, which is more than the conventional product. It is possible to obtain the effect of preventing scattering. Also, during the bar-shaped body is capable of light transmission than has the slit, is also airy Unlike traditional plate-shaped fence.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a front view of a tide fence 1 according to the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, FIG. 3 is a view taken along the line III-III in FIG. FIG. 5 is a front view of the fence panel 2.

  The tide fence 1 is constructed with foundation concrete 7, 7... On the ground at a predetermined interval, and then is erected with pillars 3, 3. The tide fence main body which consists of the fence panel 2 between is attached so that it may face a wind direction. In the illustrated example, the struts 3, 3... Are reinforced in strength with respect to wind pressure by the retaining pillars 8 arranged in an oblique direction.

  As shown in detail in FIGS. 1 and 5, the fence panel 2 is composed of an upper bar 5A and a lower bar 5B as support materials, and a large number of rod-like bodies 4 and 4 between the upper bar 5A and the lower bar 5B. ... groups are arranged.

As shown in FIG. 4, the rod-like bodies 4, 4... Are arranged in at least two rows in the wind passage direction, in the illustrated example, in two rows, the rod-like body row 4 </ b> A on the front row side and the rear row side. The rod-shaped body row 4B is in a staggered arrangement. In this case, the rod-shaped bodies 4, 4 ... horizontal spacing P _H of (refer to horizontal rows of facing direction. More specifically the rod-like body columns 4A, 4B with respect to the sea-side) in the sea-side facing surface rows, The front view width B ₁ of the rod-shaped body 4 ( the rod-shaped body width dimension in the direction facing the sea side ) is set to four times (or three times), and the row interval P _V in the sea breeze passage direction is set to the rod-shaped body 4. It is desirable to set it to twice (or 1.5 times) the expected width B ₂ ( the rod-like body width dimension in the direction orthogonal to the direction facing the sea side ) . The wind and separation vortex contracted in the front row 4A of rod-like bodies show a certain degree of diffusion tendency, so that even if a small gap is generated, a desired effect can be obtained as a splash prevention effect. Can do.

  The cross-sectional shape of the rod-shaped body 4 is circular in the illustrated example, but any cross-sectional shape can be adopted. For example, as shown in FIGS. 6A to 6G, a rectangle, a triangle, a diamond, a semicircle, a notch, an ellipse, a crescent, and the like can be given. Among these cross-sectional shapes, FIGS. 6 (B) to 6 (G) that do not have a plane opposed to the wind are less than the rectangular shape of FIG. 6 (A) that has a plane opposed to the wind direction. The effect of reducing the amount of spray is great. In the case of the cross-sectional shape as shown in FIG.

In order to attach the fence panel 2 to the pillars 3, 3, the fence panels 2, 2 are brought between the pillars 3, 3,..., And the fence panel 2 is attached in order from the lower side by the mounting brackets 6b to 6f. The fence panel 2 is installed so as to be stacked on the upper side, and fixed by the mounting brackets 6a to 6d. In the illustrated example, the fence panel 2 is arranged in two upper and lower stages, but the number of stages is arbitrary. The height H of the tide fence 1 is set according to the height of the splash assumed in the coast part where the tide fence 1 is installed. At this time, the column height H is set to be an integral multiple of the fence panel 2.
[Other examples]
(1) In the above embodiment, the rod-shaped bodies 4, 4... Are oriented in the vertical direction, but may be oriented in the horizontal direction.
(2) In order to prevent the splash from blowing up, an eave portion protruding to the sea side along the horizontal direction may be provided at the top of the tide fence 1.

In this experimental example, a verification experiment was conducted on the splash-splash preventing effect of the tide fence according to the present invention.
(1) Experimental method
(A) Experimental equipment In the experiment, a simple wind tunnel with an extension of 6m x height of 1.8m x width of 1m, a floor on the bottom, walls on both sides and no ceiling on the top, and a blower were installed. Installed to generate a wind of 10m, and installed fences (Examples 1 to 4) according to this example and fences (Comparative Examples 1 and 2) according to comparative examples at a point 2.5m from the blower. did. Then, instead of splashing, coloring powder (basclin) is sprayed on the blower for 10 minutes under the condition of 0.5 (l / min), scattered on the wind, and gauze (20cm x 20cm) is applied to the splash measurement point. The amount of colorant that was installed and captured with gauze was measured.
(B) Measurement items and calculation method
(a) Splash passage amount The splash passage amount is a value defined as the amount of splash that does not fall on the lower surface at the 6m point (end) of the wind tunnel. For measurement, install multiple gauze in the height direction at 6m in the wind tunnel, and calculate the total amount of splashes from the amount of colorant attached to the gauze (unit time (min), unit gauze area 20cm x 20cm). Find the amount.

  The adhesion amount per sheet of gauze is such that the collected gauze (while wet) is dissolved with a certain amount of water, and the attached colorant is dissolved as completely as possible. Then, water is added to adjust the total solution amount. The absorbance of the total solution is measured with an absorptiometer. For the absorbance and concentration, a calibration line as shown in FIG. 8 is prepared in advance, and the solution concentration is calculated from the calibration line. Since the total amount of solution is known, the absolute amount of colorant contained therein (ie attached to the gauze) is known. That is, the concentration of the total solution amount (g / l) × the volume of the total solution amount (1) = the absolute amount of the colorant (g).

  The passage amount graph (FIG. 11), which will be described later, is the amount of the colorant solution adhered to a 20 cm × 20 cm gauze for one minute. Therefore, the calculation method is absolute amount of colorant (g) / 3% (basclin concentration) / experiment time (min) × 1 min.

As shown in FIG. 9, the entire passing droplet amount is integrated in the height direction to obtain the passing droplet amount per unit width and then converted into the wind tunnel width. Specifically, after integrating the function f (x) in the height direction from x = 0 to x = max (the height at which the measurement height is the x-axis and the amount of droplets is 0 from the ground), the integrated value / Convert to wind tunnel width by 20cm (gauze width) x 1m (wind tunnel width).
(b) Amount of droplet subsidence The amount of droplet subsidence is a value defined as the amount of droplets that settled on the floor surface in a 6 m section of wind tunnel extension. A tray is placed at a predetermined position (3 places in the transverse direction x 6 places in the flow direction, 18 places in total), and the total amount of sedimentation is determined from the amount of colorant dropped on the tray. Take the average value in the transverse direction. In addition, since the tray cannot be installed at the rod-shaped body installation position, the value of the sedimentation amount at the rod-shaped body installation position = sedimentation amount g / 10min / (wind tunnel width m × tray length) × tray area (1 sheet) ) M, so that the amount of sediment in the rod-shaped body group = (immediately passing amount−immediately passing amount) g × spray area m ² at the fence point (9 times the gauze area in the experiment) / measurement time min × Calculate from 10 min. Then, after integrating in the wind tunnel extension direction, the amount of subsidence in the wind tunnel direction is obtained, and then converted into the wind tunnel width by integral value / 24 cm (tray width) × 1 m (wind tunnel width).
(c) Splash spray amount The spray spray amount is a value defined as the amount of spray splashing over the tide fence. Gauze is installed on the upper part of the fence at the center of the cross section, and it is determined from the amount of colorant captured by the gauze.
(d) Wind speed The passing wind speed is measured at a height of 0.65m and at a position 20cm to the left and right of the center of the wind tunnel. The blowing wind speed is measured at one location in the upper center of the cross section.
(2) Manufacture of test fence (specimen) The experiment was conducted as a tide fence according to the present invention with two types of rod-like arrangements of the following conditions (a) and (d) shown in FIGS. 7 (A) and (D). A model of a fence (Examples 1 and 2 ), a fence of the prior art, no fence (Comparative Example 1), one using a perforated folded plate (Comparative Example 2), and a black net (mesh: 500 mm x 50 mm) Of the two types of rod-shaped body arrangements using the following conditions (b) and (c) shown in FIGS. 7B and 7C (Comparative Example 3) : A total of five types of fence models (fences 4 and 5) were conducted.
(a) Example 1 (3D-6): As shown in FIG. 7A, the pure interval between the cylinders is set to 75 mm, which is three times the diameter of the cylinders, and the arrangement of the cylinder groups is arranged in a staggered manner in six rows in the wind direction. A tide fence.
(b) Comparative Example 4 (1D-6 [18.4]): As shown in FIG. 7 (B), the column spacing is 25 mm, which is one time the column diameter, and the column array is arranged in six rows in the wind direction. A tide fence with a staggered arrangement of 8 columns, 5 columns, and 2 columns in each row, and an array angle of the columns from the leeward side of 18.4 °.
(c) Comparative Example 5 (1D-2): As shown in FIG. 7C, the pure interval between the cylinders is set to 25 mm, which is one time the cylinder diameter, and the arrangement of the cylinder groups is arranged in two rows in a zigzag direction. A tide fence.
(d) Example 2 (2D-6): As shown in FIG. 7 (D), the pure interval between the cylinders is 50 mm, which is twice the diameter of the cylinders, and the arrangement of the cylinder groups is arranged in a staggered arrangement of 6 rows in the wind direction. A tide fence.
(3) Experimental results
(a) Passing wind speed The results of passing wind speed are shown in FIG. In the four types of fences according to Examples 1 to 4, the wind speed decreases rapidly after passing through the fence, and a reduction effect is seen as compared with the fences of Comparative Examples 2 to 3.
(b) Splash passage amount FIG. 11 shows the amount of colored powder trapped at heights of 15 cm, 65 cm, and 115 cm at a measurement point of 6.0 m (wind tunnel end). In FIG. 11, the fences according to Examples 1 and 2 (3D-6, 2D-6 ) have a smaller amount of trapped sand than the perforated folded plate of Comparative Example 2.
(c) Blowing up splash amount Fig. 12 shows the amount of splashing by blowing up the wind from the fence, and Fig. 13 shows the blowing up wind speed. It can be seen from FIG. 12 and FIG. 13 that the blown-up splash and the blown-up wind speed are in a substantially proportional relationship. As shown in FIG. 12, the amount of the sprayed splash can be significantly reduced in the fences according to Examples 1 and 2 as compared with Comparative Examples 2 to 5 . Further, upflow as wind speed is also shown in Figure 13, fence according to Example 1, 2 were obtained the results be less than Comparative Example 1-5.
(d) Amount of droplet settling FIG. 14 shows a distribution map of the amount of droplet settling with the horizontal axis as the wind tunnel distance. From the figure, it has been found that the fences according to Examples 1 and 2 can sink a considerable amount of droplets by the fence. FIG. 15 shows the total sedimentation amount (in the wind tunnel). From the figure, the fence of Example 1 (3D-6) did not obtain a settling amount equal to or more than the settling amount of the perforated folded plate of Comparative Example 2, but it was almost the same level. It turns out that the fence which concerns on Example 4 can sink more droplets than the fence which concerns on Comparative Examples 2 and 3 (perforated folded plate, black net), and the effect of preventing splashes is very high. I understand.
(e) Ratio of total sedimentation amount, blowing droplet amount, and passing amount In Table 1 below, for each example of Examples 1 and 2 and Comparative Examples 1 to 5 , the total sedimentation amount, blowing droplet amount, droplet passing amount, and total amount Indicates. In addition, the ratio of the total sedimentation amount, the blown-up droplet amount, and the droplet passage amount is a percentage with respect to the total amount. Moreover, the ratio of each item with respect to the whole quantity was shown in FIG.

以上から、本発明に係る防潮柵は、風が透過する際に急速に風速を低減させることができるとともに、飛沫粒子を従来品以上に沈降させることができ、高い飛沫飛散防止効果が得られることが認められる。 As can be seen from Table 1 and FIG. 16, it can be seen that the fences according to Examples 1 and 2 have a large total sedimentation amount, a small amount of sprayed droplets, and a small amount of droplets passing through.

From the above, the tide fence according to the present invention can rapidly reduce the wind speed when the wind permeates, and can sink droplet particles more than the conventional product, and can obtain a high splash scattering prevention effect. Is recognized.

1 is a front view of a tide fence 1 according to the present invention. It is a cross section of the tide fence 1 (II-II arrow directional view of FIG. 1). It is a longitudinal cross-sectional view (III-III arrow directional view of FIG. 1) of the tide fence 1. FIG. It is the A section enlarged view of FIG. It is a front view of the fence panel. It is a figure which shows the cross-sectional shape example of the rod-shaped body. It is a figure which shows the rod-shaped body arrangement | positioning of Examples 1 and 2 and Comparative Examples 4 and 5 in an Example . FIG. 6 is a correlation diagram between absorbance and concentration. It is a figure which shows the calculation point of the splash passage amount. It is a graph which shows passing wind speed. It is a graph which shows the amount of splash passage. It is a bar graph which shows the amount of blowing splashes. It is a bar graph which shows the blowing wind speed. It is a distribution map of the amount of subsidence in a wind tunnel. It is a bar graph which shows the total sedimentation amount in a wind tunnel. It is a bar graph which shows the ratio of the amount of passage, the amount of blowing-up droplets, and the total amount of sedimentation.

  DESCRIPTION OF SYMBOLS 1 ... Tidal fence, 2 ... Fence panel, 3 ... Support | pillar, 4 ... Bar-shaped body, 5A ... Upper rail, 5B ... Lower rail, 6a-6f ... Mounting bracket, 7 ... Foundation concrete

Claims (2)

A tide fence that is installed in the coastal area or in the vicinity thereof, and prevents the splashes from splashing inland by capturing and sinking and dropping the splashes scattered on the wind,
The tide fence is arranged with at least two or more rows of rod-like bodies in which rod-like bodies are arranged at predetermined intervals so as to form a row in a direction facing the sea side, in a direction orthogonal to the direction facing the sea side. The rod-like body row on the front row side and the rod-like body row on the back row side are arranged in a staggered manner between adjacent rod-like body rows, and the cross-sectional shape of the rod-like body is a circle, a triangle, a rhombus, a semicircle, a cutout circle And is oriented in an orientation that does not have a plane opposite to the wind
The rod-like body interval of the rod-like body rows is set to four times the rod-like body width dimension in the direction facing the sea side, and the spacing between the rod-like body rows is orthogonal to the direction facing the sea side. A tide fence characterized in that the tide fence is set twice as large as the width of the rod-shaped body in the direction . A tide fence that is installed in the coastal area or in the vicinity thereof, and prevents the splashes from splashing inland by capturing and sinking and dropping the splashes scattered on the wind,
The tide fence is arranged with at least two or more rows of rod-like bodies in which rod-like bodies are arranged at predetermined intervals so as to form a row in a direction facing the sea side, in a direction orthogonal to the direction facing the sea side. The rod-like body row on the front row side and the rod-like body row on the back row side are arranged in a staggered manner between adjacent rod-like body rows, and the cross-sectional shape of the rod-like body is a circle, a triangle, a rhombus, a semicircle, a cutout circle And is oriented in an orientation that does not have a plane opposite to the wind
The rod-like body interval of the rod-like body rows is set to three times the rod-like body width dimension in the direction facing the sea side, and the spacing between the rod-like body rows is orthogonal to the direction facing the sea side. A tide fence characterized by being set to 1.5 times the rod-shaped body width dimension in the direction .

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