Steel tower ground contact part rain guard tool

Abstract

To provide a steel tower ground contact part rain guard tool which can surely prevent corrosion at a ground contact part of a main column material supported at a steel tower foundation.SOLUTION: A steel tower ground contact part rain guard tool 1 includes: an umbrella part 2 in which an upper edge 2a opposes to an outer peripheral surface 50a of a main column material 50 so as to prevent corrosion in a ground contact part 51 of the main column material 50 supported at a steel tower foundation 60, and in which a lower edge 2b is arranged having a minimum interval d with the ground G; a covering part 3 which has flexibility, and in which an upper end 3a comes into close contact with the outer peripheral surface 50a above the umbrella part 2, and in which a lower end 3b is fixed to a surface 2d of the umbrella part 2; and a support part 4 stretched between the outer peripheral surface 50a and a rear surface 2e of the umbrella part 2, and for supporting the umbrella part 2 and the covering part 3.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a rain shield that prevents corrosion due to moisture of main pillar materials supported on a steel tower foundation, and in particular to a rain shield for a steel tower ground-side portion that prevents corrosion of the main pillar materials at the ground-side portion. [Background technology]

[0002] First, the ground-side portion of a main pillar material that constitutes a steel tower for power transmission will be described with reference to Fig. 6. Fig. 6 is a side view showing the ground-side portion of a main pillar material that constitutes a conventional steel tower. As shown in Figure 6, the ground-level portion 51 refers to the range of the main pillar material 50 supported by the tower foundation 60 that is close to the upper surface 60a of the tower foundation 60. This main pillar material 50 is an L-shaped steel with a mountain-shaped outer peripheral surface 50a, and is a single continuous steel material that extends from the upper end (not shown) that forms the top of the tower to the lower end 50A that is supported by the tower foundation 60. Therefore, moisture from rainfall or snowfall flows down the main pillar material 50 to the ground-level portion 51. Therefore, the water that flows down from the ground surface 51 is likely to accumulate there, and since the area is surrounded by vegetation that grows thick on the ground G and has poor ventilation, corrosion as shown by the shaded area S is likely to occur. Furthermore, a safety wire 70 for ensuring the safety of workers is usually attached to the main pillar material 50 along the longitudinal direction Y of the main pillar material 50 by a holder 71 that holds the safety wire 70. Therefore, it is thought that corrosion can occur in the ground portion 51 due to moisture that falls from the lower end 70a of the safety wire 70 or moisture that flows down along the holder 71. In order to solve these problems, technologies have been developed in recent years to prevent corrosion of steel tower foundations, although not of main pillar materials, and ideas related to this have already been disclosed.

[0003] Patent Document 1 discloses an idea entitled "Corrosion Prevention Cover for Steel Tower Foundation" relating to a corrosion prevention cover to be attached to the bottom of a steel tower frame. The invention disclosed in Patent Document 1 is characterized by an umbrella-shaped cover that prevents corrosion of the tower foundation due to rainfall, and is installed watertight from the bottom of the tower frame down to the ground so as to cover the entire tower foundation. Specifically, this type of design uses rubber magnets to attach the cover to the tower frame. This allows raindrops to flow over the rubber magnets and the cover before reaching the ground. This prevents rain from flowing directly onto the tower foundation, preventing corrosion of the tower foundation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 7-21930 Summary of the Invention [Problem to be solved by the invention]

[0005] The design disclosed in Patent Document 1 uses rubber magnets to attach the cover to the tower frame. However, because the rubber magnets are attached to the tower frame, they may not be pressed firmly against the surface. In this case, the rubber magnets' watertightness is not fully realized. As a result, rainwater passes between the tower frame and the rubber material and flows under the tower frame, which may cause corrosion in the area of ​​the tower frame near the top surface of the tower foundation, i.e., at ground level. In addition, since the cover is attached watertight from the bottom of the tower aggregate down to the ground so as to completely cover the periphery of the tower foundation, at least a part of the ground level is included inside the cover. Therefore, the inside of the cover has a closed structure and poor ventilation, so there is a risk that part of the ground level will corrode due to water vapor rising from the ground.

[0006] The present invention has been made in response to such conventional circumstances, and aims to provide a rain shield for the ground-side portion of a steel tower that can reliably prevent corrosion at the ground-side portion of the main pillar material supported by the steel tower foundation. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the first invention is a rain shield for a steel tower ground-side portion that prevents corrosion at the ground-side portion of a main pillar material supported by a steel tower foundation, and is characterized by comprising an umbrella portion whose upper edge faces the circumferential surface of the main pillar material and whose lower edge is spaced apart from the ground, a flexible covering portion above the umbrella portion, whose upper end is in close contact with the circumferential surface and whose lower end is fixed to the front surface of the umbrella portion, and a support portion that spans the circumferential surface and the back surface of the umbrella portion and supports the umbrella portion and the covering portion.

[0008] In the invention having such a configuration, it is desirable that the umbrella portion is made of a material that has the shape retention and strength to withstand deformation even when it rains or snows, while the covering portion is made of a flexible material that can deform under external force and thereby the inner surface of the upper end can be tightly attached to the outer surface. Furthermore, depending on the shape of the main pillar material, the umbrella portion and the covering portion may be installed around the entire periphery or may be installed only around a portion of the periphery of the main pillar material.

[0009] Furthermore, the umbrella portion may be supported by the peripheral surface of the main pillar material only via the support portion, or may be supported by the peripheral surface via the support portion and the mounting member held by this support portion. The support portion may be, for example, a plate- or rod-shaped member having one end abutting the circumferential surface and the other end abutting the rear surface of the umbrella portion.

[0010] In the invention having the above configuration, a flexible covering portion is provided above the umbrella portion, and the upper end of this covering portion is in close contact with the peripheral surface, thereby preventing moisture from penetrating through the gap between the peripheral surface of the main pillar material and the upper end of the covering portion. Therefore, moisture that travels down the main pillar material flows down the covering portion and the umbrella portion, preventing it from flowing down to the ground-level portion of the main pillar material.

[0011] In addition, the lower end of the covering portion is fixed to the front surface of the umbrella portion, and the umbrella portion and covering portion are supported by a support portion that spans the circumferential surface of the main pillar material and the back surface of the umbrella portion, so when the support portion is pulled to the circumferential surface of the main pillar material, the upper end of the covering portion adheres more firmly to the circumferential surface. Furthermore, the lower edge of the umbrella portion is spaced apart from the ground, ensuring ventilation inside the back side of the umbrella portion.

[0012] The second invention is characterized in that, in the first invention, a safety wire is attached to the main pillar material along its longitudinal direction, the lower end of this safety wire is located above the rain shield at the ground level of the tower, and the lower edge of the umbrella portion extends outward from the circumferential surface of the main pillar material so that it exceeds the projection position where the lower end of the safety wire is projected vertically downward.

[0013] In an invention having such a configuration, in addition to the effect of the first invention, the lower edge of the umbrella portion extends outward from the circumferential surface of the main pillar material beyond the vertically downward position of the lower end of the safety wire, so that the umbrella portion blocks moisture falling from the lower end of the safety wire.

[0014] The third invention is characterized in that, in the first or second invention, the tower foundation has a three-dimensional shape with an upper surface surrounded by a perimeter line, the main pillar material is an L-shaped steel beam whose short cross section is surrounded by a mountain-shaped outer peripheral surface, an inner peripheral surface parallel to the outer peripheral surface, and a pair of side surfaces connecting the outer peripheral surface and the inner peripheral surface, the lower end of the main pillar material is erected at an angle away from the center of the tower, the umbrella portion has a size capable of covering at least an outer area which is a part of the upper surface, and the outer area is an area sandwiched between the boundary line between the outer peripheral surface and the upper surface and an opposing edge line which is a part of the perimeter line and faces this boundary line.

[0015] In the invention configured as described above, the main pillars are L-shaped steel beams with angled outer surfaces, and the lower ends of the main pillars are erected with an inclination away from the center of the tower, so moisture flows down mainly along the outer surfaces of the main pillars, which makes it easy for corrosion to occur at the ground level of the outer surfaces.

[0016] In the invention having the above configuration, in addition to the effects of the first or second invention, the umbrella portion covers at least the outer area, which is a part of the upper surface, so that moisture flowing down the outer surface of the main pillar material does not fall directly onto the outer area, and therefore moisture that falls onto the outer area bounces back and is prevented from reaching the ground.

[0017] A fourth invention is characterized in that in the first or second invention, the umbrella portion is made of FRP material. In the invention having such a configuration, in addition to the effects of the first or second invention, the umbrella portion is made of FRP (fiber reinforced plastic) material, so it is lightweight, has shape retention against rainfall, etc., and exhibits strength that makes it difficult to break. In addition, the umbrella portion also exhibits resistance to deterioration even when installed over a long period of time. [Effects of the Invention]

[0018] According to the first invention, the upper end of the covering portion is in close contact with the peripheral surface of the main pillar material, thereby preventing moisture that has traveled down the main pillar material from flowing down to the ground surface, thereby preventing corrosion at the ground surface. Furthermore, when the support part is pulled to the circumferential surface of the main pillar material, the inner surface of the upper end of the covering part adheres more firmly to the circumferential surface, so that by adjusting the position of the umbrella part via the support part, it is possible to further prevent moisture from penetrating into the ground area. Furthermore, if the inside of the back side of the umbrella portion is breathable, water vapor rising from the ground will not be trapped inside the umbrella portion, which also effectively prevents corrosion at the ground level.

[0019] According to the second invention, in addition to the effect of the first invention, the umbrella portion blocks water dropping from the lower end of the safety wire, thereby preventing corrosion of the ground portion caused by this water.

[0020] According to the third invention, in addition to the effects of the first or second invention, the umbrella portion covers at least the outer area, which is a part of the upper surface, thereby preventing corrosion caused by moisture flowing down the outer surface of the mountain-shaped portion, and therefore corrosion at the ground level can be prevented even if the umbrella portion is not installed so as to completely surround the main column material. In addition, the umbrella portion also prevents moisture that hits the outer region from bouncing back, so according to the third invention, corrosion at the ground level of the outer surface can be efficiently prevented when the main column material is L-shaped steel.

[0021] According to the fourth aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, the umbrella portion is lightweight and easy to handle. Furthermore, the umbrella portion has various characteristics such as high strength, so that it can stably exert its corrosion prevention effect on the ground portion for a long period of time. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a plan view of a ground-side rain shield for a steel tower according to an embodiment. [Figure 2] FIG. 1 is a side view of a rain shield for a steel tower ground-side portion according to an embodiment. [Figure 3] FIG. 1 is a side view showing the use state of a ground-side rain shield for a steel tower according to an embodiment. [Figure 4] FIG. 1 is a plan view showing the use state of a ground-side rain shield for a steel tower according to an embodiment. [Figure 5] FIG. 1 is a perspective view showing the operation of a rain shield for a steel tower ground-side portion according to an embodiment. [Figure 6] FIG. 1 is a side view showing the ground-level portion of a main pillar material constituting a conventional steel tower. DETAILED DESCRIPTION OF THE INVENTION [Example]

[0023] A rain shield for a steel tower near the ground according to an embodiment of the present invention will be described in detail with reference to Figs. 1 to 5. Fig. 1 is a plan view of a rain shield for a steel tower near the ground according to an embodiment. Fig. 2 is a side view of a rain shield for a steel tower near the ground according to an embodiment. Note that the components shown in Fig. 6 are given the same reference numerals in Figs. 1 and 2, and their description will be omitted. As shown in Figures 1 and 2, the tower ground-side rain shield 1 according to the embodiment is a rain shield for preventing corrosion at the ground-side portion 51 (see Figure 6) of a main pillar material 50 supported by a tower foundation 60. The main pillar material 50 is an L-shaped steel beam with a mountain-shaped outer peripheral surface 50a, and the tower foundation 60 is frustum-shaped (see Figures 3 and 4).

[0024] The tower ground-side rain shield 1 comprises an umbrella part 2, a covering part 3 arranged above the umbrella part 2, and a support part 4 that supports the umbrella part 2 and the covering part 3. These components will be explained in order below. First, the umbrella portion 2 is made of FRP material and has an upper edge 2a, a lower edge 2b, and side edges 2c, 2c. The lower edge 2b has a tip portion 2g formed in the center thereof and having a substantially right angle. The umbrella portion 2 also has a front surface 2d and a back surface 2e, which are inclined downward from the upper edge 2a to the lower edge 2b. Furthermore, the umbrella portion 2 has a ridge portion 2f that divides the entire umbrella portion 2 equally into left and right portions.

[0025] Next, the covering portion 3 is made of a flexible silicone material and has an upper end 3a, a lower end 3b, and side ends 3c, 3c. In the case of Figure 1, the upper end 3a overlaps the upper edge 2a of the umbrella portion 2 and is in close contact with the outer peripheral surface 50a of the main pillar material 50. Meanwhile, the lower end 3b is fixed to the front surface 2d of the umbrella portion 2 with an adhesive (not shown). The covering portion 3 also has a front surface 3d and a back surface 3e. The front surface 3d and the back surface 3e are concave and curved from the upper end 3a to the lower end 3b. Furthermore, the covering portion 3 has corners 3f formed so that its overall shape matches the mountain-shaped outer peripheral surface 50a of the main pillar material 50.

[0026] In detail, as shown in FIG. 2, the front surface 3d of the covering portion 3 is formed with an inclined surface 3d1 near the upper end 3a and an inclined surface 3d2 near the lower end 3b so that moisture from above the upper end 3a can easily flow down. The back surface 3e has flat inner surfaces 3e1 and 3e2 at the upper end 3a and the lower end 3b, respectively.

[0027] The support portion 4 is a generally triangular plate made of FRP material and includes a contact end 4a and a fixed end 4b. The contact end 4a is cut into a valley shape and contacts the top of the mountain-shaped outer peripheral surface 50a. The fixed end 4b, on the other hand, protrudes in a mountain shape and is fixed to the back surface 2e of the umbrella portion 2 at a position corresponding to the ridge line portion 2f using an adhesive (not shown). Therefore, the support portion 4 spans the outer peripheral surface 50a of the main pillar material 50 and the back surface 2e of the umbrella portion 2, and supports the umbrella portion 2 and the covering portion 3. The support portion 4 also has an insertion hole 4c through which an attachment member 5 (see FIGS. 3 and 4) for attaching the support portion 4 to the main pillar material 50 is inserted.

[0028] Next, the state of use of the rain shield for the pylon ground-side portion according to the embodiment will be described with reference to Fig. 3. Fig. 3 is a side view showing the state of use of the rain shield for the pylon ground-side portion according to the embodiment. Note that the same reference numerals are used in Fig. 3 for the components shown in Figs. 1, 2 and 6, and their description will be omitted. As shown in FIG. 3, the main pillar material 50 is erected with its lower end 50A inclined in a direction away from the center of the tower (in the direction of the outline arrow). The tower base 60 is also frusto-conical in shape, with an upper surface 60a surrounded by a perimeter line 60b.

[0029] The tower ground-side rain shield 1 is attached above the ground-side portion 51 of the main pillar material 50 via the support part 4. More specifically, the tower ground-side rain shield 1 is attached so as to be immovable using an attachment member 5 that passes through the insertion hole 4c of the support part 4. As shown in Fig. 4, the attachment member 5 is a stainless steel band 5a and fixing brackets 5b to which both ends of the stainless steel band 5a are fixed.

[0030] The upper edge 2a of the umbrella portion 2 faces the outer peripheral surface 50a of the main pillar material 50 and forms a valley shape so as to abut against this outer peripheral surface 50a. The upper edge 2a and lower edge 2b are attached along the short-side direction X of the main pillar material 50, and the side edge 2c is attached along the longitudinal direction Y which is perpendicular to the short-side direction X. The lower edge 2b of the umbrella portion 2 is disposed with a minimum distance d from the ground G.

[0031] Furthermore, the upper end 3a of the covering part 3 is in close contact with the outer peripheral surface 50a of the main pillar material 50. The upper end 3a and lower end 3b of the covering part 3 are attached along the short direction X of the main pillar material 50, and the side end 3c is attached along the long direction Y of the main pillar material 50.

[0032] Here, the main pillar material 50 has a safety wire 70 attached thereto by a holder 71 along the longitudinal direction Y of the main pillar material 50. The lower end 70a of the safety wire 70 is disposed above the tower ground-side rain shield 1. Therefore, it is conceivable that moisture will not only fall from the lower end 70a of the safety wire 70, but also flow down along the holder 71. Therefore, the tower ground-side rain shield 1 also takes into consideration the possibility that moisture from the safety wire 70 and the like may cause further corrosion of the ground-side portion 51.

[0033] Specifically, the lower edge 2b of the umbrella portion 2 projects outward from the outer peripheral surface 50a of the main pillar material 50 so that the lower end 70a exceeds a projection position 70b where the lower end 70a is projected downward along the vertical direction V. Note that the projection position 70b represents a position on a horizontal plane and does not depend on the height in the vertical direction V.

[0034] Next, the state of use of the rain shield for the pylon ground-side portion according to the embodiment will be described with reference to Fig. 4. Fig. 4 is a plan view showing the state of use of the rain shield for the pylon ground-side portion according to the embodiment. Note that the same reference numerals are used in Fig. 4 for the components shown in Figs. 1 to 3 and 6, and their description will be omitted. As shown in FIG. 4, a cross section C of the main pillar material 50 in the short direction X 60 is surrounded by a mountain-shaped outer peripheral surface 50a, an inner peripheral surface 50b parallel to the outer peripheral surface 50a, and a pair of side surfaces 50c, 50c connecting the outer peripheral surface 50a and the inner peripheral surface 50b. Furthermore, since the main pillar material 50 is erected with its lower end 50A tilted away from the center of the tower (in the direction of the white arrow), moisture flows mainly down the outer peripheral surface 50a of the main pillar material 50. Therefore, corrosion is likely to occur at the ground level portion 51 (see Figure 3) of the outer peripheral surface 50a.

[0035] When the tower ground-side rain shield 1 is viewed from above along the vertical direction V, the umbrella portion 2 is large enough to cover the outer area 61, which is part of the upper surface 60a of the tower foundation 60. This outer area 61 is an area on the upper surface 60a of the tower foundation 60, sandwiched between a boundary line 60d between the outer peripheral surface 50a and the upper surface 60a of the main pillar material 50 and an opposing edge line 60c that is a part of the perimeter line 60b and faces the boundary line 60d. Furthermore, the outer area 61 is sandwiched between two imaginary straight lines L, L that connect the side edge 2c and the side end 3c.

[0036] In the tower ground-side rain shield 1 configured as described above, above the umbrella portion 2, the upper end 3a of the flexible covering portion 3 is in close contact with the outer surface 50a of the main pillar material 50, thereby preventing moisture from penetrating between this outer surface 50a and the upper end 3a. Furthermore, since a flat inner surface 3e1 is formed at the upper end 3a of the back surface 3e, the upper end 3a tightly adheres to the outer peripheral surface 50a, thereby effectively preventing the intrusion of moisture. This prevents moisture that has traveled down the main pillar material 50 from flowing down to its ground-level portion 51.

[0037] Furthermore, a flat inner surface 3e2 is formed at the lower end 3b of the back surface 3e, so the lower end 3b is uniformly and strongly adhered to the front surface 2d of the umbrella portion 2. This not only prevents moisture from entering between the lower end 3b and the front surface 2d, but also ensures that when the umbrella portion 2 is pulled toward and attached to the main post material 50, the inner surface 3e1 of the covering portion 3 adheres tightly to the outer peripheral surface 50a. The adhesion of this inner surface 3e1 can be improved by tightening the stainless steel band 5a.

[0038] Furthermore, the lower edge 2b of the umbrella part 2 is positioned with a minimum distance d from the ground G, ensuring breathability inside the back surface 2e side of the umbrella part 2. Therefore, water vapor rising from the ground G does not become trapped inside the umbrella part 2.

[0039] Next, the operation of the rain shield for the pylon ground-side portion according to the embodiment will be described in detail with reference to Fig. 5. Fig. 5 is a perspective view showing the operation of the rain shield for the pylon ground-side portion according to the embodiment. Note that the same reference numerals are used in Fig. 5 to denote the components shown in Figs. 1 to 4 and 6, and their explanation will be omitted. As shown in Figure 5, in the tower ground-side rain shield 1, the umbrella portion 2 is large enough to cover the outer area 61 shown by the diagonal lines, so that moisture flowing down the outer surface 50a of the main pillar material 50 from above the tower ground-side rain shield 1 and moisture falling directly onto the umbrella portion 2 are separated at the ridge portion 2f of the umbrella portion 2 and flow directly down to the ground, as shown by arrow W.

[0040] That is, the moisture flowing down the outer peripheral surface 50a does not fall directly onto the outer region 61. Therefore, the moisture that falls onto the outer region 61 bounces back and is prevented from reaching the ground portion 51 of the outer peripheral surface 50a.

[0041] In addition, the lower edge 2b of the umbrella portion 2 extends outward from the outer surface 50a of the main pillar material 50 so as to exceed the projection position 70b. Therefore, the moisture that flows down the lower end 70a of the safety wire 70 and the retaining device 71 is also blocked by the umbrella portion 2 and, as described above, is separated and flows directly down to the ground.

[0042] As described above, with the tower ground-level rain shield 1, as shown in Figure 5, the umbrella portion 2 prevents moisture that has flowed down the outer surface 50a of the main pillar material 50 from above the ground-level rain shield 1, or moisture that has flowed down the lower end 70a of the safety wire 70, from falling directly onto the ground-level portion 51 or bouncing off the outer area 61, thereby preventing corrosion at the ground-level portion 51. In particular, since moisture is prevented from penetrating between the outer peripheral surface 50a and the inner surface 3e1 of the covering portion 3, corrosion at the base portion 51 can be reliably prevented. In addition, since the inside of the back surface 2e of the umbrella portion 2 is ensured to be breathable, water vapor rising from the ground G does not become trapped inside the umbrella portion 2, which also ensures that corrosion at the ground portion 51 is prevented.

[0043] In addition, the tower ground-side rain shield 1 can be easily attached to the main pillar material 50 using the support part 4 and the mounting part 5, and since the umbrella part 2 is made of lightweight FRP material, it is easy to handle. Furthermore, since the umbrella portion 2 is made of FRP material, it has the ability to maintain its shape against rainfall, etc., is strong enough to withstand breakage, and is resistant to deterioration over long periods of installation, so it can stably prevent corrosion of the ground portion 51 over a long period of time.

[0044] The rain shield for the ground-side portion of the steel tower according to the present invention is not limited to the one shown in the embodiment. For example, there may be a gap between the upper edge 2a of the umbrella portion 2 and the outer peripheral surface 50a of the main pillar material 50. This gap can be covered by the covering portion 3. The lower edge 2b of the umbrella portion 2 may be arc-shaped. Furthermore, the side edges 2c, 2c of the umbrella portion 2 and the side ends 3c, 3c of the covering portion 3 may be brought closer to the circumferential edge 60b on the inner circumferential surface 50b, for example, to cover an area of ​​the upper surface 60a that is wider than the outer region 61. Alternatively, multiple support portions 4 may be provided. [Industrial Applicability]

[0045] The present invention can be used as a rain shield for the ground-side portion of a steel tower that prevents corrosion at the ground-side portion of a main pillar material supported by a steel tower foundation. [Explanation of symbols]

[0046] DESCRIPTION OF SYMBOLS 1...Rain protection device for steel tower ground-level portion 2...Umbrella portion 2a...Upper edge 2b...Lower edge 2c...Side edge 2d...Front surface 2e...Back surface 2f...Ridge portion 2g...Tip portion 3...Covering portion 3a...Top end 3b...Bottom end 3c...Side end 3d...Front surface 3d1, 3d2...Sloped surface 3e...Back surface 3e1, 3e2...Inner surface 3f...Corner portion 4...Support portion 4a...Abutting end 4b...Fixed end 4c...Through-hole 5...Mounting member 5a...Stainless steel band 5b...Fixing metal fitting 50...Main pillar material 50A...Bottom end 50a...Outer surface 50b...Inner surface 50c...Side surface 51...Ground-level portion 60...Steel tower foundation 60a...Top surface 60b...Periphery line 60c...Opposite edge line 60d...boundary line 61...outer area 70...safety wire 70a...lower end 70b...projection position 71...holder

Claims

1. A tower ground-side rain shield that prevents corrosion at the ground-side of a main pillar material supported on a tower foundation, An umbrella portion whose upper edge faces the peripheral surface of the main pillar material and whose lower edge is disposed with a gap between it and the ground; a flexible covering portion above the umbrella portion, the covering portion having an upper end that is in close contact with the circumferential surface and a lower end that is fixed to the front surface of the umbrella portion; A rain shield for a ground-side section of a steel tower, characterized in that it is provided with a support section that spans the peripheral surface and the back surface of the umbrella section and supports the umbrella section and the covering section.

2. A safety wire is attached to the main pillar material along its longitudinal direction, The lower end of this safety wire is located above the ground-side rain shield of the tower, The tower ground-side rain shield device described in claim 1, characterized in that the umbrella portion extends outward from the peripheral surface of the main pillar material so that the lower edge exceeds the projected position where the lower end of the safety wire is projected vertically downward.

3. The tower foundation has a three-dimensional shape having an upper surface surrounded by a perimeter line, The main pillar material is an L-shaped steel whose cross section in the short side direction is surrounded by a mountain-shaped outer peripheral surface, an inner peripheral surface parallel to the outer peripheral surface, and a pair of side surfaces connecting the outer peripheral surface and the inner peripheral surface, and the lower end of the main pillar material is erected at an angle away from the center of the tower, the umbrella portion has a size capable of covering at least an outer region that is a part of the upper surface, A rain shield for a ground-side section of a tower as described in claim 1 or claim 2, characterized in that the outer area is an area sandwiched between a boundary line between the outer peripheral surface and the upper surface and an opposing edge line that is opposite this boundary line and is part of the perimeter line.

4. The rain shield for a ground-side portion of a steel tower according to claim 1 or 2, characterized in that the umbrella portion is made of FRP material.

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