Curing sheet and its connecting structure

Abstract

To provide a curing sheet with improved insulation property, and to provide a connection structure of the same.SOLUTION: A curing sheet used in a work in a charging facility comprises: a sheet portion 6 formed of a mesh-like sheet material 5 composed of an insulating material; a belt portion 7 provided at a peripheral edge portion of the sheet portion; and a button hole 8 provided in the belt portion. The belt portion comprises a mesh-like belt portion sheet material 9 laminated on the sheet material forming the peripheral edge portion and composed of an insulating material. The sheet material and the belt portion sheet material form the belt portion having a first layer Y1 at a front side, a second layer Y2 in the middle, and a third layer Y3 at a rear side. The button holes are provided at the same positions of the first layer and the third layer as one pair, and the second layer is interposed between the pair of button holes.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a protective sheet and a connection structure thereof, and in particular to a protective sheet and a connection structure thereof used during work on charging equipment. [Background technology]

[0002] In charging equipment including a line to which a voltage is applied, various types of work may be performed. For example, painting work, which is one type of work, may be performed on a steel tower, which is one type of charging equipment.

[0003] During this process, the tower is covered with a protective sheet to prevent paint from splashing onto the surrounding area. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-13827 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, sometimes a part of the curing sheet comes off the tower due to strong winds, etc. In this case, if the curing sheet is blown by the strong wind and comes into contact with a live line, there is a risk that high voltage current will flow from the line through the curing sheet. Therefore, in order to increase the safety of workers, a curing sheet with improved insulation performance is desired.

[0006] The present disclosure has been devised in light of the above circumstances, and its purpose is to provide a protective sheet and a connection structure thereof with improved insulating performance. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, A protective sheet used during work on a charging facility, a sheet portion formed of a mesh-shaped sheet material made of an insulating material; A band portion provided on a peripheral edge of the sheet portion; A buttonhole provided on the belt portion; Equipped with the belt portion includes a mesh-shaped belt portion sheet material made of an insulating material and laminated on the sheet material forming the peripheral edge portion, the sheet material and the band sheet material form the band having a first layer on a front side, a second layer in the middle, and a third layer on a back side; The buttonholes are provided in pairs at the same positions on the first layer and the third layer, and the second layer is interposed between the pair of buttonholes. The present invention provides a protective sheet characterized by the above.

[0008] Preferably, the curing sheet does not contain a conductive material.

[0009] Preferably, the protective sheet is configured to have a voltage resistance characteristic of a predetermined voltage per predetermined length in a dry state.

[0010] Preferably, the predetermined length is 1 m and the predetermined voltage is 300 kV.

[0011] Preferably, at least one of the sheet material and the band sheet material has a raschel structure formed from synthetic resin fibers.

[0012] Preferably, at least one of the sheet portion and the band portion includes a flame retardant material.

[0013] Preferably, the band sheet material is folded back in the width direction and attached to the sheet material in a state in which the sheet material is sandwiched therebetween, The strip sheet material forms the first and third layers, and the sheet material forms the second layer.

[0014] Preferably, the strap sheet material is sewn to the sheet material at locations on the outside and inside of the buttonholes.

[0015] Preferably, the sheet portion is formed by two sheets of the sheet material overlapping each other. The two sheets of material form the second layer.

[0016] Preferably, the charging facility is a steel tower, and the work is painting work.

[0017] According to one aspect of the present disclosure, A curing sheet connection structure formed by connecting the curing sheets, A first curing sheet and a second curing sheet each consisting of the curing sheet; A linear material that connects the first curing sheet and the second curing sheet; Equipped with The filament is inserted through the buttonholes of the first layer and the third layer at the near edge portion of the first curing sheet and penetrates the second layer, and is inserted through the buttonholes of the first layer and the third layer at the near edge portion of the second curing sheet and penetrates the second layer, Both ends of the wire are bound to each other. The present invention provides a protective sheet connecting structure. Effect of the Invention

[0018] According to the present disclosure, it is possible to provide a protective sheet and a connection structure thereof with improved insulating performance. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a schematic diagram showing a state in which the protective sheet according to the present embodiment is used. [Diagram 2] FIG. 2 is a front view showing the protective sheet 1. [Diagram 3] FIG. 4 is an enlarged view showing the structure of the belt portion. [Figure 4] FIG. 2 is a schematic diagram showing a test device for the curing sheet. [Diagram 5] FIG. 4 is a cross-sectional view showing a method of installing the protective sheet. [Figure 6] FIG. 2 is an enlarged view showing the protective sheet connection structure of the present embodiment. [Figure 7] FIG. 11 is an enlarged view showing another example of a protective sheet connecting structure. [Figure 8] FIG. 11 is a cross-sectional view showing a configuration of a third modified example. [Figure 9] FIG. 13 is a cross-sectional view illustrating a schematic configuration of a fourth modified example. [Figure 10] FIG. 13 is a cross-sectional view illustrating a schematic configuration of a fifth modified example. [Figure 11] FIG. 13 is a front view showing a schematic configuration of a sixth modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the following embodiments.

[0021] FIG. 1 is a schematic diagram showing a state in which a protective sheet according to this embodiment is used. The protective sheet 1 is used during work at a charging facility. In this embodiment, the charging facility is a steel tower 2, and the work is painting work. The charging facility refers to equipment or a structure including a line or equipment to which a voltage can be applied, and includes a state in which a voltage is actually applied (live line state) and a state in which a voltage is not applied (non-live line state). The voltage includes high voltage and extra high voltage as defined in Article 2, Paragraph 1 of the Technical Standards for Electrical Equipment, but may also include low voltage. The steel tower 2 of this embodiment includes an extra high voltage line supported by its upper part outside the figure.

[0022] In the illustrated example, the curing sheet 1 is laid at the lower end of the iron tower 2. A first support member 3 extending horizontally is installed at a predetermined height position of the iron tower 2, and the curing sheet 1 is suspended from the first support member 3. A horizontal scaffold board (not shown) is installed at the same height position as the first support member 3. The first support member 3, the curing sheet 1, and the scaffold board are provided on the front, rear, left, and right sides of the iron tower 2, and these four sides are covered by the curing sheet 1. A second support member 4 extending horizontally is installed at a height position lower than the first support member 3 and closer to the ground G, and the lower end of the curing sheet 1 is supported by the second support member 4. The second support member 4 is also provided on the front, rear, left, and right sides of the iron tower 2.

[0023] Figure 2 shows the curing sheet 1 of this embodiment. The front, rear, left, right, upper, and lower directions of the curing sheet 1 are defined as shown in the figure. However, it should be noted that these directions are only defined for convenience of explanation. The front side in the paper thickness direction of the figure is the front side, which is the front side of the curing sheet 1. The back side in the paper thickness direction of the figure is the back side, which is the back side of the curing sheet 1. The dimensions, scales, etc. of each part are not accurate and are exaggerated for easy understanding.

[0024] The curing sheet 1 includes a sheet portion 6, a band portion 7 provided at the peripheral edge of the sheet portion 6, and buttonholes 8 provided in the band portion 7. The curing sheet 1 is quadrilateral, specifically a vertically long rectangle, and has a length L1 in the vertical direction (longitudinal direction) and a width W1 (<L1) in the horizontal direction (width direction). The symbols CL and CW indicate the center in the length L1 direction (referred to as the length center) and the center in the width W1 direction (referred to as the width center), respectively. The intersection of these is defined as the curing sheet center O1. The side spaced apart from the curing sheet center O1 in the sheet surface direction is the outer side, and the approaching side is the inner side.

[0025] The sheet portion 6 is formed of a mesh-like sheet material 5 made of an insulating material. The sheet portion 6 and the sheet material 5 do not contain a conductive material. The sheet material 5 has a raschel structure formed by raschel-weaving synthetic resin fibers or threads, which are insulating materials, and has a relatively strong structure. Any type of synthetic resin may be used, but in this embodiment, it is polyethylene. The sheet portion 6 is a vertically long rectangle having substantially the same dimensions as the protective sheet 1. The sheet portion 6 in this embodiment is formed of a single sheet material 5.

[0026] The belt portion 7 includes a mesh-shaped belt portion sheet material 9 made of an insulating material. The belt portion sheet material 9 is similar to the sheet material 5, and has a raschel structure formed by raschel-weaving synthetic resin fibers or threads, which are insulating materials, and is a relatively strong structure. Any type of synthetic resin may be used, but in this embodiment, it is polyethylene. The belt portion 7 and the belt portion sheet material 9 do not include a conductive material. As will be described in detail later, the belt portion sheet material 9 is laminated on the peripheral portion of the sheet portion 6. This increases the thickness of the peripheral portion of the protective sheet 1, improving its strength.

[0027] The belt portion 7 is provided continuously along the entire length of the four edge portions of the sheet portion 6, i.e., continuously along the entire circumference of the sheet portion 6. The belt portion 7 has a length extending in the longitudinal direction of the edge portion and a width W7 extending in a direction perpendicular to the longitudinal direction of the edge portion. The length of the belt portion 7 in this embodiment is equal to the length of each corresponding edge portion. Since the structure of the belt portion 7 at each edge portion is the same, the structure of the belt portion 7 at the upper edge portion surrounded by the imaginary circle III will be representatively described below.

[0028] 3, (A) is a front view similar to FIG. 2, and (B) is a cross-sectional view taken along line IIIB-IIIB of (A). As shown in the figure, the band sheet material 9 is folded back in the width direction and attached to the sheet material 5 with the sheet material 5 sandwiched therebetween. The band sheet material 9 originally has a width about twice the width W7 of the band 7, but by folding back once in the width direction, the width is reduced to half. The sheet material 5 is sandwiched between the folded back band sheet material 9, and the sheet material 5 is inserted to the innermost position. The end edge 10 of the sheet material 5 (the upper end edge in the illustrated example) is abutted against or approaches the inner surface of the fold 11 of the band sheet material 9.

[0029] In this state, the belt sheet material 9 is sewn to the sheet material 5 with a sewing thread at the outer side (upper side in the illustrated example) and inner side (lower side in the illustrated example) of the buttonhole 8. Reference numeral 12 denotes the sewing thread or a seam formed by the sewing thread. The seam 12 extends along the longitudinal direction of the belt 7.

[0030] The buttonhole 8 is provided in the widthwise center of the belt 7, extends in the longitudinal direction of the belt 7, and is formed in the shape of a slit. In this embodiment, the buttonhole 8 is formed at the same time as the belt sheet material 9 is sewn, but it may be formed after the belt sheet material 9 is sewn by cutting and stitching holes in the belt sheet material 9. The buttonhole 8 is located exactly midway between the outer and inner seams 12 in the width direction of the belt 7. As shown in FIG. 2, a plurality of buttonholes 8 are provided at predetermined intervals (equally spaced in this embodiment) in the longitudinal direction of the belt 7.

[0031] A pair of buttonholes 8 are provided at the same positions on the belt sheet material 9 located on the front side and the belt sheet material 9 located on the back side, sandwiching the sheet material 5. The sheet material 5 is interposed between the pair of buttonholes 8. Therefore, the pair of buttonholes 8 appear to be blocked by the sheet material 5 and do not communicate with each other.

[0032] When the belt portion 7 is formed in this manner, the sheet material 5 and the belt portion sheet material 9 form the belt portion 7 having a first layer Y1 on the front side, a second layer Y2 in the middle, and a third layer Y3 on the back side. The belt portion sheet material 9 forms the first layer Y1 and the third layer Y3, and the sheet material 5 forms the second layer Y2. A pair of buttonholes 8 are provided at the same positions in the first layer Y1 and the third layer Y3, and the second layer Y2 is interposed between the pair of buttonholes 8.

[0033] The protective sheet 1 of this embodiment configured as described above does not contain any conductive material as a whole, has high insulation properties, and is configured to have a withstand voltage characteristic of a predetermined voltage per predetermined length. In this embodiment, the predetermined length is 1 m, and the predetermined voltage is 300 kV. Hereinafter, the predetermined length is referred to as the withstand voltage reference length, and the predetermined voltage is referred to as the minimum withstand voltage value. Note that the length here refers to the length in a general sense, including the length L1 and width W1 of the protective sheet 1.

[0034] The interval between the buttonholes 8 in the longitudinal direction of the band 7 is shorter than the standard length for the withstand voltage.

[0035] Fig. 4 shows a test device for conducting a voltage withstand test on a curing sheet. A square, dry curing sheet 1X with a length L1 = 1 m and a width W1 = 1 m is used as the test curing sheet. This curing sheet 1X is attached to a pair of electrodes 21, 22 spaced 1 m apart from each other above and below. The length L1 and width W1 of the curing sheet 1X and the distance between the electrodes 21, 22 are equal to the reference length for voltage withstand.

[0036] The electrodes 21 and 22 are formed of horizontally extending conductive stainless steel pipes. The entire upper edge of the protective sheet 1X is attached to the upper electrode 21 in contact with the sheet, and the entire lower edge of the protective sheet 1X is attached to the lower electrode 22 in contact with the sheet.

[0037] An AC voltage is applied to the upper electrode 21, and the lower electrode 22 is grounded. When the magnitude of the AC voltage applied to the upper electrode 21 gradually increases, the insulation of the protective sheet 1X breaks down when it reaches a certain voltage, and current flows from the upper electrode 21 to the lower electrode 22. This insulation breakdown is called flashover, and the voltage at which insulation breakdown occurs is called the flashover voltage.

[0038] In the case of Test Curing Sheet 1X, no flashover occurred even when the voltage was increased to 300kV. Therefore, it can be said that the flashover voltage of Test Curing Sheet 1X is higher than 300kV. In other words, Test Curing Sheet 1X has a voltage resistance characteristic of at least 300kV.

[0039] From this test, it can be seen that the protective sheet 1 of this embodiment has a withstand voltage characteristic of 300 kV per meter in a dry state. Because it has such extremely high withstand voltage characteristics and insulating performance, the protective sheet 1 can be safely used in charging equipment.

[0040] Next, a method of using the protective sheet 1 of this embodiment will be described.

[0041] 1, a protective sheet connected body 13 is used in which three protective sheets 1 with a width W1 of 1.8 m and a length L1 of 10 to several tens of meters are connected side by side (in the width W1 direction) to a total width of 5.4 m. The protective sheets 1 in this protective sheet connected body 13 are connected by sewing together the band portions 7 adjacent to each other in the horizontal direction.

[0042] The front-rear, left-right, top-bottom directions in Figure 1 are the same as those in Figure 2. In the illustrated example, the front of the steel tower 2 is covered by two curing sheet connected bodies 13 arranged side by side. These curing sheet connected bodies 13 are arranged so as to leave as few gaps as possible between them, and their upper parts are overlapped. As described above, the upper and lower edges of the curing sheet connected bodies 13 are attached to and supported by the first supporting material 3 and the second supporting material 4, respectively. The lower edge of the curing sheet connected body 13 is brought close to the ground G or is landed on the ground.

[0043] Although not shown, the rear surface and the left and right sides of the tower 2 are also covered by the protective sheet connectors 13. Painting of the tower 2 is carried out on the inside or back side of these protective sheet connectors 13, and paint is prevented from splashing onto the outside or front side of the protective sheet connectors 13.

[0044] The number of connected protective sheets 1 in the protective sheet connected body 13 is not limited to 3, but may be any number such as 2 or 4. If necessary, the protective sheets 1 may be connected vertically (in the length L1 direction).

[0045] The first support member 3 and the second support member 4 are formed of rods made of an insulating material. In this embodiment, the first support member 3 and the second support member 4 are formed of hollow rods made of FRP and having a circular cross section.

[0046] In this embodiment, an example is shown in which only the lower end of the tower 2 is covered with the curing sheet 1, but it is of course possible to cover the upper part as well. For example, the tower 2 has multiple arms at its upper part that protrude horizontally and support the railway line, and these arms can also be covered with the curing sheet 1.

[0047] We will now explain how to attach the curing sheet 1 to the first supporting material 3 and the second supporting material 4. As a representative example, we will explain how to attach the upper edge of the curing sheet 1 to the first supporting material 3 as shown in Figure 3. Although we will not explain this, the attachment methods for other attachment points are similar.

[0048] In Fig. 5, (A) is a front view, and (B) is a VB-VB cross-sectional view of (A). As shown in Fig. 5, a filamentary material 14 is used to attach the curing sheet 1 to the first support material 3. A plastically deformable metal wire or metal wire is used as the filamentary material 14, and in this embodiment, a wire that is generally used at construction sites and the like is used.

[0049] The filamentary material 14 is inserted through the buttonholes 8 in the first layer Y1 and the third layer Y3 of the belt portion 7 of the protective sheet 1, and also penetrates the second layer Y2. More specifically, when attaching the filamentary material 14 to the belt portion 7, one end of the filamentary material 14 is inserted, for example, through the buttonhole 8 in the first layer Y1, and then pierced through the second layer Y2. At this time, the mesh hole in the second layer Y2 is forcibly pushed open by the end of the filamentary material 14. Thereafter, the end of the filamentary material 14 is inserted through the buttonhole 8 in the third layer Y3. In this way, the filamentary material 14 is attached to the belt portion 7 of the protective sheet 1.

[0050] Next, the filament 14 is wound around the portion of the belt 7 located outside the buttonhole 8 (upper side in the illustrated example), twisted one or more times, and then wound around the first support material 3. Then, both ends of the filament 14 are twisted one or more times to be fixed to each other, i.e., bound together, and the installation of the protective sheet 1 is completed. Reference numeral 15 indicates the first twisted portion, and reference numeral 16 indicates the last twisted portion. The first twisted portion 15 may be omitted.

[0051] In this way, the band portion 7 at the upper edge of the protective sheet 1 is attached to the first support material 3 by the wire material 14 at the positions of the multiple buttonholes 8. As a result, the protective sheet 1 is supported by the first support material 3 in a suspended state.

[0052] The protective sheet 1 is attached to the second support material 4 using a buttonhole 8 close to it and a wire material 14.

[0053] Unless otherwise specified, the spacing between the wire members 14 is set to be greater than the specified distance (1 m). This ensures that the wire members 14 can withstand a specified voltage (300 kV) even if the protective sheet 1 comes off and the wire members 14 come into contact with a live line, thereby improving safety.

[0054] Next, a method for connecting a plurality of protective sheets 1 and a protective sheet connection structure formed by connecting a plurality of protective sheets 1 will be described.

[0055] 6 shows a protective sheet connecting structure 17 of this embodiment. The protective sheet connecting structure 17 includes a first protective sheet 1A and a second protective sheet 1B made of the protective sheet 1, and a linear material 14 connecting the first protective sheet 1A and the second protective sheet 1B.

[0056] The first and second protective sheets 1A and 1B are arranged side by side. The first protective sheet 1A has a proximal edge portion 18A adjacent to the second protective sheet 1B. The second protective sheet 1B has a proximal edge portion 18B adjacent to the first protective sheet 1A.

[0057] The connection by the filament material 14 is made using the buttonholes 8, 8 located at the closest height position on both adjacent edge portions 18A, 18B. One end of the filament material 14 is inserted through the buttonholes 8 on the front and back of the first protective sheet 1A and penetrates the sheet material 5 in the same manner as above. Similarly, the other end of the filament material 14 is inserted through the buttonholes 8 on the front and back of the second protective sheet 1B and penetrates the sheet material 5. In this embodiment, the insertion and penetration are from the back side to the front side, but this may be reversed.

[0058] Next, both ends of the linear material 14 protruding from the front sides of the first and second protective sheets 1A, 1B are twisted one or more times to bind them together, completing the connection, and forming a protective sheet connection structure 17.

[0059] Such connections are made at the positions of the required number of buttonholes 8. The connection points are preferably spaced apart by the above-mentioned predetermined distance (1 m) or more.

[0060] The protective sheet connecting structure 17 of this embodiment is applicable to connecting the adjacent edge portions of two adjacent protective sheets 1 in two horizontally arranged protective sheet connected bodies 13 as shown in Fig. 1. It is also applicable to connecting the adjacent edge portions of two protective sheets 1 in one protective sheet connected body 13. Naturally, it is also applicable to connecting the adjacent edge portions of two protective sheets 1 arranged vertically.

[0061] The protective sheet connecting structure 17 of this embodiment is also applicable to the case where the adjacent edge portions (i.e., the belt portions 7) of two protective sheets 1 are overlapped and connected together. In this case, as shown in Fig. 7, the belt portions 7 of the first and second protective sheets 1A, 1B are overlapped and the positions of the buttonholes 8 of both are aligned. Then, one end of the filament material 14 is inserted through both buttonholes 8 at the first position P1, and the other end of the filament material 14 is inserted through both buttonholes 8 at the second position P2 away from (preferably adjacent to) the first position P1. Both ends of the filament material 14 are twisted and bound together, and the protective sheet connecting structure 17 is completed.

[0062] Next, the effects of this embodiment will be described.

[0063] As described above, this embodiment can provide a protective sheet 1 with improved voltage resistance characteristics and insulating performance. Therefore, even if a part of the protective sheet 1 is detached from the tower 2 due to a strong wind or the like and is blown by the strong wind into contact with a live line, it is possible to prevent a high voltage current from flowing from the line to the protective sheet. This ensures the safety of workers.

[0064] The protective sheet 1 of this embodiment also has the following advantage. Generally, when painting a live-line steel tower, the protective sheet 1 must be installed at the start of the day's work and removed at the end of the day's work, which requires installation and removal work. This installation and removal work reduces the actual painting work time per day and reduces work efficiency. This may also extend the overall construction period.

[0065] On the other hand, although it may be possible to omit the connection and disconnection work by shutting down the live line, it is actually difficult to shut down the live line, especially in the summer when electricity demand is high. Therefore, the method of improving work efficiency by shutting down the live line is not realistic.

[0066] On the other hand, the protective sheet 1 of this embodiment has excellent voltage resistance characteristics and insulating performance, so that it may be possible to omit the work of attaching and detaching the protective sheet 1 even when painting a steel tower in a live line state. That is, it may be possible to leave the protective sheet 1 on from the beginning to the end of the construction period, as in the case of painting a general house or the like. This may extend the effective painting work time per day, improve work efficiency, and shorten the entire construction period. In addition, since it is not necessary to stop the live line, painting work can be done at any time, and the timing of painting work can be set at any time regardless of power demand, etc. This increases the flexibility of work timing.

[0067] Furthermore, according to this embodiment, since the belt portion 7 has the first layer Y1, the second layer Y2, and the third layer Y3, a high-strength belt portion 7 can be provided at the edge portion of the protective sheet 1. Therefore, when the protective sheet 1 is attached by attaching the belt portion 7 to another member, it is possible to reliably prevent the belt portion 7 from being torn and damaged.

[0068] Furthermore, according to this embodiment, the belt portion 7 is provided with the buttonholes 8 as described above, and the filament material 14 is inserted through the buttonholes 8 for attachment, improving the strength of the attachment portion. That is, if a long period of time passes after attachment, the through holes in the sheet material 6 (second layer Y2) through which the filament material 14 passes may widen, which may cause the sheet material 6 to tear. However, in this embodiment, the filament material 14 is also inserted through the buttonholes 8 on the front and back at the same time. Therefore, the buttonholes 8 restrict the through holes from expanding, and tearing of the sheet material 6 can be suppressed.

[0069] In general mesh sheets, multiple metal eyelet rings are provided on the edge portion. In contrast, the buttonholes 8 of this embodiment are simply cuts in the belt-like sheet material 9, and do not contain metal or conductive materials. This also improves the insulating performance of the protective sheet 1.

[0070] Furthermore, according to this embodiment, since the sheet material 6 (second layer Y2) is interposed between the front and back buttonholes 8, it is possible to prevent paint from passing through the buttonholes 8 and scattering to the outside.

[0071] The protective sheet connecting structure 17 of this embodiment can also achieve the same effects.

[0072] Next, a modified example will be described. Note that a description of the same parts as in the basic embodiment will be omitted, and the following description will focus mainly on the differences from the basic embodiment.

[0073] (Variation 1) At least one of the sheet portion 6 and the belt portion 7 may contain a flame-retardant material. Specifically, at least one of the insulating fiber constituting the sheet material 5 and the insulating fiber constituting the belt portion sheet material 9 may contain a flame-retardant material. By including such a flame-retardant material, the safety of the protective sheet 1 can be further improved.

[0074] (Variation 2) A mark for identifying whether or not a flame-retardant material is present may be provided on the protective sheet 1. For example, the color of the buttonhole 8 can be changed depending on whether or not a flame-retardant material is present, or the colored line on the belt part 7 can be changed. This makes it easy to handle the protective sheet 1, as the presence or absence of a flame-retardant material can be determined at a glance.

[0075] (Variation 3) 8, the sheet portion 6 may be formed by two sheets of sheet material 5 superimposed on each other. In this case, the two sheets of sheet material 5 form the second layer Y2.

[0076] The two sheet materials 5 have the same length L1 and width W1 and are completely overlapped with each other, and are sewn together at the same time that the belt-like sheet material 9 is sewn together.

[0077] By doubling the sheet material 5 in this manner, the sheet portion 6 can be made stronger.

[0078] (Variation 4) 9A and 9B show schematic diagrams of various modified examples of the band portion 7. For ease of comparison, FIG. 9A shows the basic embodiment (FIG. 3B).

[0079] In the modified example shown in (B), two strip sheet materials 9, 9 having the same width as the strip 7 are sandwiched between the sheet material 5 and sewn to the sheet material 5. At this time, the strip sheet material 9 on the front side forms the first layer Y1, the middle sheet material 5 forms the second layer Y2, and the strip sheet material 9 on the back side forms the third layer Y3.

[0080] In the modification shown in (C), an edge portion of the sheet material 5 is folded twice in an S-shape to form a belt portion 7. The belt portion sheet material 9 is integrated with the sheet material 5. The front sheet material 5 forms the first layer Y1, and the middle and rear sheet materials 5 (which form the belt portion sheet material 9) form the second layer Y2 and the third layer Y3. Buttonholes 8 are provided in the front sheet material 5 and the rear sheet material 5.

[0081] In the modification shown in (D), the belt sheet material 9 is folded in half and sewn to the back side of the sheet material 5. The front sheet material 5 forms the first layer Y1, and the middle and back belt sheet materials 9 form the second layer Y2 and the third layer Y3. Buttonholes 8 are provided in the front sheet material 5 and the back belt sheet material 9.

[0082] (Variation 5) Fig. 10 shows a combination of a sheet portion 6 formed by overlapping two sheets of sheet material 5 with the modified examples shown in Fig. 9(B) to (D). For ease of comparison, Fig. 10(A) shows the basic embodiment (Fig. 8).

[0083] The modified example shown in Fig. 10(B) is a combination with the modified example shown in Fig. 9(B) The two intermediate sheet materials 5 form the second layer Y2.

[0084] The modified example shown in Figure 10(C) is a combination with the modified example shown in Figure 9(C). Another sheet material 5 is added to the front side of the front sheet material 5 (Y1) of the modified example shown in Figure 9(C). The added frontmost sheet material 5 forms the first layer Y1. The two middle sheet materials 5 (sheet material 5 and band sheet material 9) form the second layer Y2. The back sheet material 5 (strap sheet material 9) forms the third layer Y3. Buttonholes 8 are provided in the additional sheet material 5 and the back sheet material 5.

[0085] The modified example shown in Fig. 10(D) is a combination with the modified example shown in Fig. 9(D). Another sheet material 5 is added to the front side of the front sheet material 5 (Y1) of the modified example shown in Fig. 9(D). The added frontmost sheet material 5 forms the first layer Y1. The two middle sheet materials, i.e., the sheet material 5 and the band sheet material 9, form the second layer Y2. The back band sheet material 9 forms the third layer Y3. Buttonholes 8 are provided in the additional sheet material 5 and the back band sheet material 9.

[0086] In addition to the above, the structure of the band portion 7 can be modified in various ways.

[0087] (Variation 6) 11 shows modified examples regarding the arrangement of the belt portion 7 in the protective sheet 1. FIG. 11(A) shows the basic embodiment (FIG. 2).

[0088] In the modification shown in (B), the belt portion 7 is divided in the longitudinal direction of the edge of the sheet portion 6, and multiple belt portions 7 are provided at intervals along the longitudinal direction. The multiple belt portions 7 are provided intermittently along the four edges of the sheet portion 6, i.e., intermittently along the entire circumference of the sheet portion 6. Each belt portion 7 has buttonholes 8 on the front and back.

[0089] Since strength is essentially required mainly at the position of the buttonhole 8, it is possible to obtain sufficient strength for the protective sheet 1 even if the belt portion 7 is limited to the position of the buttonhole 8 in this way. Furthermore, with the structure of this modified example, the material cost of the belt portion sheet material 9 can be reduced.

[0090] In this modified example, one band 7 is provided for each set of front and back buttonholes 8, but one band 7 may be provided for multiple sets of front and back buttonholes 8.

[0091] (Variation 7) The charging equipment does not necessarily have to be a tower, but may be, for example, a power transmission, receiving or transforming equipment, and the work does not necessarily have to be painting work, but may be, for example, repair, maintenance, inspection or construction work.

[0092] (Variation 8) The predetermined length (standard length for withstand voltage) and the predetermined voltage (minimum withstand voltage value) are not limited to 1 m and 300 kV, but can be set to any value within a range in which the above-mentioned objects and functions can be achieved.

[0093] (Variation 9) Only one of the sheet material 5 and the band sheet material 9 may have a raschel structure formed from synthetic resin fibers, and the other may have another structure.

[0094] (Variation 10) Only one of the sheet portion 6 and the band portion 7 may include a flame retardant material.

[0095] Various other modifications are possible.

[0096] The configurations of the above-mentioned embodiments and modifications can be combined in part or in whole unless there is a particular contradiction. The embodiments of the present disclosure are not limited to the above-mentioned embodiments, and all modifications, applications, and equivalents encompassed within the spirit of the present disclosure as defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be interpreted as being limited, and can be applied to any other technology that falls within the spirit of the present disclosure. [Explanation of symbols]

[0097] 1. Protective sheet 1A First protective sheet 1B Second protective sheet 2. Steel Tower 5 Sheet material 6 Seat section 7 Belt 8 Buttonhole 9 Belt sheet material 14 Wire material 17 Curing sheet connection structure 18A, 18B Near edge Y1 1st tier Y2 2nd tier Y3 3rd layer

Claims

1. A protective sheet used during work on a charging facility, a sheet portion formed of a mesh-shaped sheet material made of an insulating material; A band portion provided on a peripheral edge of the sheet portion; A buttonhole provided on the belt portion; Equipped with the belt portion includes a mesh-shaped belt portion sheet material made of an insulating material and laminated on the sheet material forming the peripheral edge portion, the sheet material and the strip sheet material form the strip having a first layer on a front side, a second layer in the middle, and a third layer on a back side; The buttonholes are provided in pairs at the same positions on the first layer and the third layer, and the second layer is interposed between the pair of buttonholes. A protective sheet characterized by the above.

2. Contains no conductive materials The protective sheet according to claim 1.

3. The device is configured to have a withstand voltage characteristic of a predetermined voltage per a predetermined length in a dry state. The protective sheet according to claim 1 or 2.

4. The predetermined length is 1 m, and the predetermined voltage is 300 kV. The protective sheet according to claim 3.

5. At least one of the sheet material and the belt sheet material has a raschel structure formed of synthetic resin fibers. The protective sheet according to any one of claims 1 to 4.

6. At least one of the sheet portion and the band portion contains a flame retardant material. The protective sheet according to any one of claims 1 to 5.

7. The band sheet material is folded back in the width direction and attached to the sheet material in a state in which the band sheet material is sandwiched between the band sheet material and the sheet material. The strip sheet material forms the first and third layers, and the sheet material forms the second layer. The protective sheet according to any one of claims 1 to 6.

8. The strap sheet material is sewn to the sheet material at positions outside and inside the buttonholes. The protective sheet according to any one of claims 1 to 7.

9. The sheet portion is formed by two sheets of the sheet material overlapping each other. The two sheets of material form the second layer. The protective sheet according to any one of claims 1 to 8.

10. The charging equipment is a steel tower, and the work is painting work. The protective sheet according to any one of claims 1 to 9.

11. A protective sheet connection structure formed by connecting the protective sheets according to any one of claims 1 to 10, A first curing sheet and a second curing sheet each comprising the curing sheet; A linear material connecting the first curing sheet and the second curing sheet; Equipped with The filament is inserted through the buttonholes of the first layer and the third layer at the near edge portion of the first curing sheet and penetrates the second layer, and is inserted through the buttonholes of the first layer and the third layer at the near edge portion of the second curing sheet and penetrates the second layer, Both ends of the wire are bound to each other. A protective sheet connecting structure.

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