JPH0441876A - Snow fall preventing member for steel tower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention promotes the melting of snow that has fallen on steel towers under natural conditions, or allows the snow to fall in pieces, thereby creating a large snowpack under the tower. In order to prevent snow from falling down and causing unexpected damage to people's homes, various construction facilities, or agricultural crops under the tower, the snow is prevented from falling and is retained on the tower members, allowing it to melt as the outside temperature rises. This invention relates to a member for preventing falling snow that is attached to a steel tower member so that it can be dissolved into water or broken into small pieces.

[Conventional technology] In recent years, with the progress of regional development, residential areas, etc. have come closer to existing power transmission lines, and many new power transmission lines have been constructed due to increased demand for electricity, making it difficult for power transmission lines to connect to residential areas, agricultural land, etc. There are many cases where steel towers are located close together.

When snow falls on a steel tower, as shown in FIG. 15, snow 20 clings to the main, diagonal, and horizontal members of the steel tower member 10, and grows into large snow masses depending on the location. If such snowflakes fall from a high place on a steel tower, they may cause damage to passersby, structures, or agricultural crops below the tower.

Therefore, if a net is attached to the steel tower, a heater is attached to the steel tower members to melt the snow, or a protrusion that serves as a stopper is installed on the steel tower members, when the snow tries to slide down the diagonal members, the stopper will catch the snow. Attempts have been made to stop the snow from falling, to allow the snow to melt naturally as outside temperatures rise, or to allow the snow to fall in pieces, but none of these methods can be said to be sufficient. This is the reality.

[Problems to be Solved by the Invention] As shown in Fig. 15, according to the results of observing the falling state of snow capped on each steel tower member 10.10, it was found that snow capped on the main material, horizontal members, and diagonal members of the steel tower. Unless it is blown outward by the wind, most of the snow falls directly downwards, and in the middle of its fall, it collides with other steel tower members, breaking into pieces and reaching the ground in relatively many cases.

However, the snowflakes falling from the arm part, especially the arm part 10A at the lowest position shown in FIG. 15, have no object to collide with downward, and fall as large snowflakes that have left the arm.

FIG. 14 is an explanatory diagram showing the state of the fall on the arm IOA over time.

The snow 20 initially covers the tower arm IOA as shown in FIG. 14(a). However, it rarely remains in that state, and due to the rise in outside temperature or the influence of wind, the snow 20 on the arm IOA gradually loses its balance, and as shown in Figure 14 (b), the balance of gravity from the tower arm IOA This causes the snowpack to shift and protrude,
Eventually, the protruding snow mass falls directly to the ground as shown in Figure (C).

If this type of snowfall falls while the snow is capped and the density of the snow is still sparse, the snowpack will form a single solution during its fall and become flaky by the time it reaches the ground. However, as shown in Figure 14 (a), some of this new snow remains capped, and as the outside temperature rises, some of it melts and becomes a snowpack containing moisture. In many cases, snow falls due to the water film formed between the steel tower and the steel tower, and in such cases, the above-mentioned solution is not solved and the snow falls as it is. If it does not fall while still containing moisture and freezes at night, it becomes a so-called frozen snow mass, and if such frozen snow mass falls from the tower arm 10 when the weather improves the next day, it may cause serious damage. There is a risk of giving.

In view of the above-mentioned circumstances, it is an object of the present invention to allow snow to move easily on the steel tower members, and to allow the snow to move directly onto the steel tower members without forming an overhanging snow mass as shown in FIG. 14(b). A falling snow prevention member for a steel tower, which can be attached to a steel tower member so that the capping continues, melts as the outside temperature rises, becomes melt water, drips and disappears, or breaks into pieces, and can configure the steel tower itself to prevent snow damage. This is what we are trying to provide.

[Means for Solving the Problems] The present invention preferably consists of a long planar body such as plastic or rubber, and is formed so that it can be attached in the longitudinal direction of a steel tower member, and has a large number of recesses in the longitudinal direction. It is formed by forming.

[Function] If a planar body in which a large number of recesses are formed in the longitudinal direction is attached to the surface of a steel tower member with an adhesive or the like, where there is a high risk of snow flakes falling, the concave portions can be formed on the planar body The large number of recessed portions actively prevent the movement of snow, making it possible to prevent the formation of overhanging snowpack as shown in FIG. 14(b) above.

[Example] The present invention will be described below with reference to Examples.

FIG. 1 shows an example of a snow fall prevention member 1 according to the present invention in which a large number of concave portions 2, 2 are continuously formed in the longitudinal direction as shown in the A-A cross-sectional view in FIG. 2(a). FIG. 3 is an explanatory perspective view showing how the steel tower member 10 made of angle material is adhered with agent 3;

Regarding the length L1 width W1 depth H of the recess 2 formed here, etc., the area where the steel tower to which this snow fall prevention member is attached is constructed, the snow quality determined by the area, the normal amount of snowfall, the inclination angle of the steel tower member However, considering the area where snowfall occurs, such as the Kanto region, which is the target of this invention, the snow cap height is at most about 50 cm, and the depth H can be determined by experiment. It is possible to achieve a sufficient effect with about 10 to 15 temples.

Regarding the width W, if it is too wide, snow damage prevention member 1
This is undesirable as it reduces the strength of the material itself.
It is desirable to select a width W that leaves an edge width comparable to the depth H described above.

Regarding the length, it is necessary to consider the creep length of the snowpack on the arm when snow falls (about 500 m).
Taking this into consideration, it is considered necessary to set the width to 500 m or less, and to set the lower limit to the same extent as the above-mentioned width W.

Note that FIG. 2(b) is a sectional view of an embodiment that is an improved version of FIG. 2(a) and has a modified recess 2 in which a recess 2a is further formed in the edge portion toward the inner wall surface.

FIG. 3 is an explanatory perspective view showing another embodiment of the present invention attached to a steel tower member.

In this embodiment, a drain slit 4 is formed between the recesses 2, 2 to create a continuous state, and FIG. 4 shows a sectional view taken along the line B-B in FIG. be.

When the outside temperature rises and part of the snow melts into water, such a drainage slit 4 allows the melted water to flow down through the drainage slit 4 and be removed as water droplets, especially as described above. This helps prevent the formation of frozen snowpack at night.

Incidentally, FIG. 4(b) is a sectional view showing a case where a drain slit 4 similar to the embodiment of FIG. 2(b) is formed.

FIG. 5 shows yet another embodiment, and FIG. 6 is a sectional view taken along line CC in FIG. As can be seen from FIG. 6, the recess 2 is a through-hole, and a drain hole 4- is formed to communicate with the through-hole, so that water from melted snow flows down from the drain hole 4' as described above. This is intended to prevent snow from being removed and forming a hydrated snowpack.

FIG. 7 shows an example in which the recess 2 is formed into a circular shape, and there is no particular difference other than the shape of the recess.

In addition, in FIG. 8, each side is attached to the steel tower member using an adhesive, whereas the snow fall prevention member 1 itself is attached with a mounting bracket 5 made of stainless steel, etc. 10 is an explanatory diagram showing an example in which the mounting fitting 5 is bent and gripped to facilitate installation and removal.

FIG. 9 is an explanatory perspective view showing an example in which the falling snow prevention member 1 according to the present invention is attached to a pipe member as the steel tower member 10,
There is nothing special about the installation other than the fact that the object has a circular cross section.

10 to 13 show examples in which each of four embodiments of the snow fall prevention member 1 according to the present invention is attached to a steel tower member 10 made of angle material, and is formed in this way. This example is given to show that the shape, number, arrangement, etc. of the recesses can be variously modified as necessary.

As mentioned above, the material for the snowfall prevention member for the steel tower constructed as above must be an appropriate material that is easy to process, such as plastic or rubber, and has weather resistance for many years. Needless to say, there is no particular limitation as long as it satisfies these conditions and can be easily attached and fixed to the steel tower parts.

[Effect of the invention] As described above, if a snow damage prevention type steel tower is constructed by attaching the snow fall prevention member according to the present invention to a steel tower member, the concave portion of the attached member actively prevents the movement of snow, and the snow fall prevention member according to the present invention is attached to a steel tower member. Since it is possible to maintain the state in which the snow is on the ground, there is no risk that the snowpack will slip and lose its balance due to creep and fall.If a drainage hole is provided in the concave part, the moisture generated by the melting of the snow will be drained into water droplets. As a result, it can be discharged dripping outside the steel tower member, and it is also possible to prevent the formation of highly dangerous frozen snow masses in the event of a fall.

If the snow stops moving on the steel tower members as described above, it will eventually all melt due to the outside temperature and disappear as water, making it possible to sufficiently prevent damage from falling snow.

[Brief explanation of the drawing]

Fig. 1 is an explanatory perspective view showing how the embodiment of the present invention is attached to a steel tower member, Fig. 2(a) is a sectional view taken along line A-A in Fig. 1, and Fig. 2(b) is an improved example thereof. FIG. 3 is an explanatory perspective view showing how another embodiment is attached to a steel tower member, FIG. 4(a) is a sectional view taken along line B-B in FIG. 3, and FIG.
A sectional view showing a case where a drainage slit is formed in the embodiment shown in FIG. 5, FIG. C-C of
7 is an explanatory perspective view showing how another embodiment is attached to a steel tower member; FIG. 8 is a cross-sectional explanatory view showing an embodiment having a mounting bracket for attaching to a steel tower member; FIG.
The figure is an explanatory perspective view showing how the embodiment according to the present invention is attached to a pipe-shaped steel tower member, and Figures 10 to 13 are explanatory perspective views showing how four different embodiments are attached to the steel tower member, respectively. , Fig. 14 (a), (b), and (C) are explanatory diagrams showing how snow capped on a steel tower arm becomes snowflakes and falls over time, and Fig. 15 shows how snow capped on a steel tower. FIG. snow fall prevention member, 2: recess, 3: adhesive, 14-' drainage slit or hole, 5: mounting bracket, 10: steel tower member, 10A double tower arm, 20: snow. Spear 5 Figure 8 Figure 3 Figure 10 Figure 12 Figure 2 Figure 4 Figure 11 j3rI! I Figure 14 Figure 15

Claims (1)

[Claims] (1) A falling snow prevention member for a steel tower, which is made of a planar body that can be attached to a steel tower member in the longitudinal direction and has a large number of recesses formed in the longitudinal direction.