Scaffold device

Abstract

To provide a foldable ladder body by forming the ladder body using a first ladder element and a second ladder element and coupling the first ladder element and the second ladder element in a rotatable manner.SOLUTION: A scaffold device of the present invention ensures a scaffold under an aerial wire, and includes first and second ladder elements and a coupling structure. The coupling structure couples the first and second ladder elements in a rotatable manner. When the second ladder element is folded to the first ladder element side, the first ladder element and the second ladder element are arranged overlapping each other. On the other side, when a pole material of the first ladder element and a pole material of the second ladder element are arranged to be substantially concentric (including a state of being concentric) with each other, the first ladder element side and the second ladder element form a set of scaffold areas.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a scaffold for performing work below overhead wires, and more specifically to a scaffolding device that can be folded to a compact size. [Background technology]

[0002] Power plants generate electricity at several thousand to tens of thousands of volts, but to avoid losses due to electrical resistance, the electricity is converted to ultra-high voltage of around several hundred thousand volts before transmission. The voltage is then gradually reduced at various substations, such as ultra-high voltage substations, primary substations, secondary substations, and distribution substations, before being supplied to factories and other facilities, and is further reduced by pole-mounted transformers before being supplied to homes. In any case, the electricity generated at power plants is supplied to users via transmission and distribution lines that use electric wires and cables (hereinafter collectively referred to as "transmission lines, etc."), and naturally, there are a huge number of transmission lines, etc., deployed throughout the country.

[0003] Traditionally, power lines have mainly been strung on steel towers and power poles, but in recent years, undergrounding has been promoted, and for example, in Tokyo's 23 wards, 92.6% of the lines have been undergrounded (as of 2021). However, nationwide, the number of underground sections is still small, at just under 20%, and the current situation is that the majority of power lines are still strung on steel towers and power poles.

[0004] Various electrical equipment, including power lines, insulators, cross arms, and pole-mounted transformers, are used to transmit electricity to homes and other areas, and maintenance and inspection work on these electrical equipment is carried out on a daily basis. Various methods are used for this maintenance and inspection work depending on the location of the electrical equipment. For example, when performing maintenance and inspection work on power lines and other equipment at the top of a steel tower, scaffolding is installed because this is known as working at height. Traditionally, scaffolding known as "overhead ladders" has been widely used for work at the top of steel towers.

[0005] As shown in Figure 10, an overhead catenary ladder comprises a ladder body LD with multiple steps installed between two supports, a wire rope WR attached to the tip of the ladder body LD (the right end in the figure), and a hook HK attached to the tip of the wire rope WR. When using an overhead catenary ladder, the ladder body LD is positioned so that it is roughly horizontal below the power lines, etc., meaning that the ladder body LD is used as a foothold. In this case, one end of the ladder body LD is suspended from the power lines, etc. by the wire rope WR with the hook HK attached, and the other end is often supported using part of a steel tower.

[0006] As mentioned above, overhead line ladders are often used, and therefore various improved technologies for overhead line ladders have been proposed. For example, Patent Document 1 proposes a "work scaffold" that uses a "long member" instead of the wire rope WR shown in Figure 10, and that can adjust the distance between the power line, etc. and the ladder body LD by changing the length of this long member. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-241688 Summary of the Invention [Problem to be solved by the invention]

[0008] Conventionally used overhead line ladders, including the work scaffolding disclosed in Patent Document 1, often have a ladder body LD length of approximately 3.0 m to 4.5 m, with a total weight of approximately 18.0 kg for a 4.5 m ladder. When performing maintenance and inspection work on a transmission tower in a mountainous region, the overhead line ladder must be transported manually, but walking long distances while carrying 18.0 kg is a considerable burden on the transporter. In particular, when a temporary construction road leading to the transmission tower has not been constructed, the length of the ladder body LD (3.0 m to 4.5 m) makes transportation even more difficult. In addition to carrying a weight of 18.0 kg, transporting a long overhead line ladder while dodging vegetation and other obstacles requires considerable effort from the transporter.

[0009] The object of the present invention is to solve the problems of the prior art, that is, to provide a scaffolding device that can be transported in a more compact state than conventional scaffolding devices. [Means for solving the problem]

[0010] The present invention was made based on the idea that the ladder body is made up of a first ladder body and a second ladder body, and that the ladder body can be folded by rotatably connecting the first ladder body and the second ladder body, and is based on an unprecedented idea.

[0011] The scaffolding device of the present invention is a device for securing a scaffold below an overhead wire, and includes a first ladder body, a second ladder body, and a connecting structure. The first and second ladder bodies are each composed of a "support material" and a "step material" consisting of a left support and a right support, and the connecting structure is composed of a "left middle plate" and a "right middle plate" each having two insertion holes. The first and second ladder bodies are each composed of two or more step materials that are approximately perpendicular (including perpendicular) to the axial direction of the support material, and are attached to the left and right supports with a gap in the axial direction of the support material. "Protruding plates" with insertion holes are attached to the ends of the left and right supports. The connecting structure rotatably connects the first and second ladder bodies by pin connections in which axles are inserted through the insertion holes of the protruding plate and the left intermediate plate of the left support column of each of the first and second ladder bodies, and by pin connections in which axles are inserted through the insertion holes of the protruding plate and the right intermediate plate of the right support column of each of the first and second ladder bodies. When the second ladder body is rotated so as to fold toward the first ladder body, the first and second ladder bodies are positioned so as to overlap. On the other hand, when the support members of the first ladder body and the second ladder body are positioned so as to be approximately coaxial (including coaxial), a continuous foothold is formed by the first ladder body and the second ladder body. Then, by arranging the first and second ladder bodies along the overhead wire in the "foothold" state, a foothold can be secured below the overhead wire.

[0012] The scaffolding device of the present invention may also have a connecting structure including a left sliding body and a right sliding body. The cylindrical left sliding body inserted onto the left support column can slide in the axial direction of the left support column, and similarly, the cylindrical right sliding body inserted onto the right support column can slide in the axial direction of the right support column. When the scaffolding stage is formed, sliding the left sliding body causes it to be inserted onto the left support columns of the first ladder body and the second ladder body, and sliding the right sliding body causes it to be inserted onto the right support columns of the first ladder body and the second ladder body, thereby restricting the rotation of the first ladder body and the second ladder body.

[0013] The scaffolding device of the present invention may also have a left sliding body and a right sliding body that are composed of a splice plate and a curved plate. In this case, the left sliding body and the right sliding body are composed of two splice plates that are arranged opposite each other and have insertion holes, and curved plates whose ends are continuous with the respective splice plates. In this case, with the left sliding body fitted onto the left support columns of the first ladder body and the second ladder body, respectively, the left support columns can be fastened with the curved plate by bolts inserted into the insertion holes of the two overlapping splice plates. Similarly, with the right sliding body fitted onto the right support columns of the first ladder body and the second ladder body, respectively, the right support columns can be fastened with the curved plate by bolts inserted into the insertion holes of the two overlapping splice plates.

[0014] The scaffolding device of the present invention may further comprise an independent ladder body including support members and step members, and a tubular connector. In this case, the second ladder body and the independent ladder body can be detachably connected by inserting a connector into each of the left support members of the second ladder body and the independent ladder body, and inserting a connector into each of the right support members of the second ladder body and the independent ladder body.

[0015] The scaffolding device of the present invention may further include an overhead wire locking body and a locking shaft member. This overhead wire locking body includes an arm and a hook attached to the tip of the arm, and the locking shaft member is detachably attached to the end of the support material for the second ladder body. The locking shaft members are attached to the left and right support columns so as to be approximately perpendicular (including perpendicular) to the axial direction of the support material. The overhead wire locking body is attached to the locking shaft member so that the arm can rotate around the axis of the locking shaft member. In this case, the first ladder body and the second ladder body are suspended and supported by the overhead wire by hooking the hook of the overhead wire locking body onto the overhead wire.

[0016] The scaffolding device of the present invention may have left and right supports formed from CFRP, and the surface of the step material may be treated with an anti-slip coating. [Effects of the Invention]

[0017] The scaffolding device of the present invention has the following effects. (1) By folding it, it can be transported in a more compact state, which reduces the burden on the worker. (2) When the total length of the scaffold is 4.5 m, the main body of the scaffold (the first and second ladder bodies) and the independent ladder body can be transported separately, and the maximum transport weight can be reduced to about 8.5 kg (the main body of the scaffold). This also reduces the burden on the workers. (3) By protecting the connecting structure with the left and right sliding bodies, the connecting state between the first and second ladder bodies can be maintained more stably, which makes work on the scaffolding safer. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a side view schematically showing the scaffolding device of the present invention positioned below a power transmission line and generally along the power transmission line; [Figure 2] FIG. 2 is a plan view of the ladder body constituting the scaffolding device, viewed from above. [Figure 3] FIG. 2A is a perspective view showing the protruding plate, and FIG. 2B is a side view showing the protruding plate in a schematic manner. [Figure 4] (a) is a plan view showing the "connection structure" in a schematic manner, (b) is a front view showing the intermediate plate, and (c) is a side view showing the connection structure in a schematic manner. [Figure 5] (a) is a side view showing a schematic diagram of the connecting structure when the support member 111 of the first ladder body and the support member of the second ladder body are rotated until they overlap, and (b) is an oblique view showing the scaffolding device folded so that the first ladder body and the second ladder body overlap. [Figure 6] (a) is a perspective view showing a slide body extrapolated to a support material, and (b) is a cross-sectional view of the slide body cut along a plane perpendicular to the axial direction. [Figure 7] An oblique view schematically showing the state in which the protrusion plate coupler of the first ladder body and the protrusion plate coupler of the second ladder body are connected by an auxiliary rope. [Figure 8](a) is a plan view from above of the locking shaft member attached to the tip side of the second ladder body, and (b) is a plan view from above of the overhead line locking body attached to the locking shaft member. [Figure 9] A plan view of the ladder body that constitutes a scaffolding device including an independent ladder body, viewed from above. [Figure 10] This is a perspective view of the "overhead ladder" that has been widely used in the past. DETAILED DESCRIPTION OF THE INVENTION

[0019] An example of an embodiment of the scaffolding device of the present invention will be described with reference to the drawings. The present invention is a technology for securing a scaffolding below an "overhead line" and can be used for various overhead lines, but for convenience, the following description will be given using an example in which the overhead line is a power transmission line.

[0020] 1 is a side view schematically showing a scaffolding system 100 of the present invention, which is positioned below a power transmission line and generally along the line. As shown in this figure, the scaffolding system 100 of the present invention is suspended from the power line by connecting one end (the left side in the figure) to a steel tower or the like and hanging the other end from the power line. The scaffolding system 100 supported by the steel tower and the power line can form a generally horizontal plane below the power line and along the power line, and this plane can be used as scaffolding to carry out maintenance and inspection work on the power line.

[0021] The scaffolding device 100 of the present invention is configured to include a ladder body 110 as shown in Figure 2, and can also be configured to include a slide body 130, a locking shaft member 140, an overhead line locking body 150, an independent ladder body 110C, a connecting body 160, etc., which will be described later. Each of the main elements that make up the scaffolding device 100 of the present invention will be described in detail below.

[0022] FIG. 2 is a plan view of the ladder body 110 constituting the scaffolding device 100, seen from above. As shown in this figure, the ladder body 110 is composed of a first ladder body 110A and a second ladder body 110B. For convenience, the longitudinal direction of the ladder body 110 (left-right direction in the figure) will be referred to as the "axial direction," and the lateral direction of the ladder body 110 (up-down direction in the figure), which is perpendicular to the axial direction, will be referred to as the "width direction." Furthermore, one side of the axial direction where the second ladder body 110B is located (the right side in the figure) will be referred to as the "tip side," and the opposite side (the left side in the figure) will be referred to as the "rear end side." The left and right sides of the scaffolding device 100 are those viewed from the rear end side toward the tip side.

[0023] As shown in FIG. 2, the first ladder body 110A includes a left support member 111L disposed on the left side in the axial direction and a right support member 111R disposed on the right side in the axial direction. A plurality of widthwise step members 112 (three in the figure) are spaced apart in the axial direction and attached to the left support member 111L and the right support member 111R. In other words, the first ladder body 110A has a configuration similar to that of a normal ladder. A widthwise connecting bar 114 can also be attached to the left support member 111L and the right support member 111R at the rear end of the first ladder body 110A. The left support member 111L and the right support member 111R are collectively referred to as "support members 111."

[0024] The second ladder body 110B, like the first ladder body 110A, has a left support member 111L and a right support member 111R, and multiple (three in the figure) step members 112 arranged in the width direction are attached to the left support member 111L and the right support member 111R. In addition, a connecting bar 114 can be attached to the left support member 111L and the right support member 111R at the tip side of the second ladder body 110B.

[0025] The support members 111 (left support member 111L and right support member 111R) can be formed from a variety of materials, but a lightweight material such as carbon fiber reinforced plastic (CFRP) is preferable because it facilitates the transportation of the scaffolding device 100. CFRP has a Young's modulus of 80 GPa or more and a specific gravity of approximately 1.5, achieving a weight reduction that cannot be achieved with aluminum. When the support members 111 are made from CFRP, their surfaces can be protected with glass fiber reinforced plastic (GFRP), aramid fiber reinforced plastic (AFRP), impact-resistant paint such as polyurea, or sheet material made from elastomer or thermoplastic resin. The step members 112 can also be formed from a variety of materials, but it is preferable to use aluminum or other lightweight materials to reduce weight, and it is also recommended to apply a non-slip coating to the surface. The step member 112 can be fixed to the surface of the support member 111 in the form of a plate, or can be attached in the form of a ring so as to be wound around the left support member 111L and the right support member 111R.

[0026] A plate-shaped protruding plate 113 is attached to the end of the support member 111. Specifically, as shown in Fig. 2, a protruding plate 113 (hereinafter, specifically referred to as "left protruding plate 113L") is attached to the tip end of the left support member 111L associated with the first ladder body 110A, and a protruding plate 113 (hereinafter, specifically referred to as "right protruding plate 113R") is attached to the tip end of the right support member 111R associated with the first ladder body 110A. Furthermore, a left protruding plate 113L is attached to the rear end of the left support member 111L associated with the second ladder body 110B, and a right protruding plate 113R is attached to the rear end of the right support member 111R associated with the second ladder body 110B.

[0027] 3A and 3B are diagrams showing the protruding plate 113, with (a) being a perspective view and (b) being a side view seen in the width direction. As shown in this figure, the protruding plate 113 is a plate-like member whose outer shape is a combination of a rectangle and a semicircle, and has a small through-hole (hereinafter referred to as the "protruding plate insertion hole 113H") near its center.

[0028] As described above, the protruding plate 113 is attached to the end of the support member 111. When attaching the protruding plate 113 to the end of the support member 111, the support member 111 and the protruding plate 113 can be formed as a single unit, or the protruding plate 113 can be a separate piece and fixed to the support member 111 by gluing, welding, or the like. Alternatively, as shown in FIG. 3, the protruding plate 113 can be attached to the end of the support member 111 using a protruding plate coupler 113C to which the protruding plate 113 is fixed. Specifically, an adhesive is applied to the inner surface of the support member 111 and the surface of the protruding plate coupler 113C, and then a portion of the support member 111 is fitted onto the protruding plate coupler 113C as shown in FIG. 3(b). The adhesive hardens to fix the protruding plate coupler 113C (i.e., the protruding plate 113) to the support member 111. Like the step member 112, the protruding plate 113 and the protruding plate coupler 113C can be made of various materials, but it is preferable to use a light metal such as lightweight aluminum.

[0029] The first ladder body 110A and the second ladder body 110B are rotatably connected by a "connection structure." Figure 4 shows the connection structure, with (a) being a plan view of the connection structure from above, (b) being a front view of the intermediate plate 120 that constitutes the connection structure, and (c) being a side view of the connection structure viewed in the width direction. As shown in Figure 4(a), the connection structure includes the intermediate plate 120. This intermediate plate 120 is a plate-like member with an outer shape that combines a rectangle and two semicircles, and has two small through-holes (hereinafter referred to as "intermediate plate insertion holes 120H") formed therein. Like the protruding plate 113 and the protruding plate coupler 113C, the intermediate plate 120 can be formed from a variety of materials, but it is preferable to use a lightweight metal such as aluminum.

[0030] The first ladder body 110A and the second ladder body 110B are connected using an intermediate plate 120 and a protruding plate 113 attached to the support material 111. Below, the procedure for connecting the first ladder body 110A and the second ladder body 110B using the connecting structure will be described in detail with reference to Figure 4(a).

[0031] First, the first ladder body 110A and the second ladder body 110B are positioned so that the left protruding plate 113L of the left support member 111L of the first ladder body 110A faces the left protruding plate 113L of the left support member 111L of the second ladder body 110B, and the right protruding plate 113R of the right support member 111R of the first ladder body 110A faces the right protruding plate 113R of the right support member 111R of the second ladder body 110B. Next, an intermediate plate 120 is positioned to abut against the left protruding plate 113L, and another intermediate plate 120 is positioned to abut against the right protruding plate 113R. At this time, the left intermediate plate 120 is positioned so that the intermediate plate insertion hole 120H at its rear end aligns with the protruding plate insertion hole 113H of the left protruding plate 113L associated with the first ladder body 110A, and the intermediate plate insertion hole 120H at its front end aligns with the protruding plate insertion hole 113H of the left protruding plate 113L associated with the second ladder body 110B. Similarly, the right intermediate plate 120 is positioned so that the intermediate plate insertion hole 120H at its rear end aligns with the protruding plate insertion hole 113H of the right protruding plate 113R associated with the first ladder body 110A, and the intermediate plate insertion hole 120H at its front end aligns with the protruding plate insertion hole 113H of the right protruding plate 113R associated with the second ladder body 110B.

[0032] Then, connecting shafts 120P such as bolts or thumb screws are inserted into the intermediate plate insertion holes 120H and the protruding plate insertion holes 113H, which are aligned at four points. As a result, the first ladder body 110A (particularly the left protruding plate 113L and the right protruding plate 113R) and the intermediate plate 120 are pin-connected, and the second ladder body 110B (particularly the left protruding plate 113L and the right protruding plate 113R) and the intermediate plate 120 are pin-connected, so that the first ladder body 110A and the second ladder body 110B are rotatably connected via the intermediate plate 120.

[0033] 5(a) is a side view showing a schematic diagram of the connection structure when the support members 111 of the first ladder body 110A and the support members 111 of the second ladder body 110B are rotated until they overlap, and FIG. 5(b) is a perspective view showing the scaffolding device 100 folded so that the first ladder body 110A and the second ladder body 110B overlap. As shown in this figure, the scaffolding device 100 of the present invention can be folded so that the first ladder body 110A and the second ladder body 110B overlap, because the first ladder body 110A and the second ladder body 110B are rotatably connected. This allows the scaffolding device 100 to be transported in a compact state, and can be easily transported while avoiding vegetation and other obstacles, even in cases where temporary roads for construction work have not been constructed, thereby reducing the burden on workers.

[0034] On the other hand, when the second ladder body 110B is rotated 180° clockwise from the state shown in Fig. 5, the support members 111 of the first ladder body 110A and the support members 111 of the second ladder body 110B are arranged so as to be substantially coaxial (including coaxial), and a series of "scaffolding" consisting of the first ladder body 110A and the second ladder body 110B is formed. Then, with this scaffolding formed, one end (for example, the rear end) of the scaffolding device 100 can be connected to the steel tower and the other end (for example, the front end) can be hooked onto the power transmission line, as shown in Fig. 1, thereby securing a scaffolding below the power transmission line.

[0035] When using the scaffolding device 100 of the present invention, it is necessary to maintain the scaffold in a formed state. Meanwhile, since the first ladder body 110A and the second ladder body 110B are rotatably connected, it is desirable to temporarily restrict the rotation of the first ladder body 110A and the second ladder body 110B during use. In this case, it is recommended to use the "sliding body 130" shown in Figure 6. Figure 6(a) is a perspective view showing the sliding body 130 extrapolated to the support material 111, and Figure 6(b) is a cross-sectional view of the sliding body 130 cut along a plane perpendicular to the axial direction.

[0036] As shown in Figure 6(a), the slide body 130 provided on the left side (hereinafter, specifically referred to as the "left slide body 130L") is inserted outside the left support member 111L of the first ladder body 110A and the left support member 111L of the second ladder body 110B, and the slide body 130 provided on the right side (hereinafter, specifically referred to as the "right slide body 130R") is inserted outside the right support member 111R of the first ladder body 110A and the right support member 111R of the second ladder body 110B. Therefore, as shown in Figure 6(b), the slide bodies 130 (left slide body 130L and right slide body 130R) are hollow cylindrical.

[0037] In addition, the inner diameter of the slide body 130 is slightly larger than the outer diameter of the support member 111, which allows the slide body 130 to slide in the axial direction while being extrapolated onto the support member 111. For example, the right slide body 130R shown in Figure 6(a) is in a position covering the right support member 111R associated with the first ladder body 110A (i.e., on the rear end side), while the left slide body 130L, which has slid to the front end side, is in a position covering the connection portion between the first ladder body 110A and the second ladder body 110B (such as the front and rear left protruding plate 113L and intermediate plate 120).

[0038] The left slide 130L shown in FIG. 6(a) is inserted into a portion (front end) of the left support member 111L of the first ladder body 110A and into a portion (rear end) of the left support member 111L of the second ladder body 110B, thereby preventing the left support members 111L from rotating relative to each other. Similarly, when the right slide 130R is inserted into a portion (front end) of the right support member 111R of the first ladder body 110A and into a portion (rear end) of the right support member 111R of the second ladder body 110B, the right support members 111R are prevented from rotating relative to each other. By restricting the pin connections of the left and right support members 111 in this way, the rotation of the first ladder body 110A and the second ladder body 110B is restricted, thereby forming a stable foothold.

[0039] If the slide body 130, which is positioned to restrict the rotation of the first ladder body 110A and the second ladder body 110B, slides to a position where it comes off the support material 111 of one of the first ladder body 110A and the second ladder body 110B, it may not be possible to form a stable footing. Therefore, it is advisable to configure the slide body 130 to be fixed so that it does not slide from a predetermined position.

[0040] 6 is configured to include two splice plates 131 arranged opposite to each other and a curved plate 132 that is roughly circular in cross section, with a small gap formed between the two splice plates 131. The ends of the curved plate 132 are continuous with the respective splice plates 131, and the curved plate 132 and splice plate 131 are formed as a single unit. Each of the two opposing splice plates 131 is provided with one or more insertion holes.

[0041] 6, it is preferable to move the sliding body 130 while maintaining the gap formed between the two splice plates 131. On the other hand, when the sliding body 130 is arranged in a predetermined position, i.e., when it is inserted through the support material 111 of the first ladder body 110A and also through the support material 111 of the second ladder body 110B, it is preferable to insert bolts BT (or thumb screws) into the insertion holes of both of the opposing splice plates 131 and then tighten the bolts BT using nuts NT. The two splice plates 131 tightened by the bolts BT move closer to each other, and as a result, the support material 111 is tightened against the curved plate 132. This increases the frictional force between the outer peripheral surface of the support material 111 and the inner peripheral surface of the curved plate 132, thereby restricting the sliding movement of the sliding body 130.

[0042] When fastening the splice plates 131 with the bolts BT and nuts NT (or thumb screws), it is advisable to position the splice plates 131 in a position away from above, such as below or to the side, as in the case of the left slide body 130L shown in Figure 6(a). Before fastening with the bolts BT or the like, a gap is formed between the two splice plates 131, so the slide body 130 can be easily rotated around the axial direction. This allows a foothold to be formed with the splice plates 131 positioned below or to the side, allowing the worker to work safely without tripping over the splice plates 131.

[0043] As explained above, the first ladder body 110A and the second ladder body 110B are connected by inserting the connecting shaft 120P through the protruding plate insertion hole 113H of the protruding plate 113 and the intermediate plate insertion hole 120H of the intermediate plate 120. In this case, a bolt BT and a nut NT can also be used as the connecting shaft 120P. Fastening the protruding plate 113 and the intermediate plate 120 with the bolt BT and the nut NT is preferable as it prevents the second ladder body 110B from coming off the first ladder body 110A.

[0044] Furthermore, in preparation for unforeseen circumstances, the first ladder body 110A and the second ladder body 110B can be connected together with an auxiliary rope SR, as shown in Figure 7. Figure 7 is a perspective view that shows a state in which the protruding plate coupler 113C of the first ladder body 110A and the protruding plate coupler 113C of the second ladder body 110B are connected together with the auxiliary rope SR. The protruding plate coupler 113C shown in this figure has two auxiliary insertion holes 113S, and the first ladder body 110A and the second ladder body 110B can be connected together by inserting the auxiliary rope SR into these auxiliary insertion holes 113S. Specifically, a protruding plate coupler 113C fixed to the support member 111 of the first ladder body 110A and a protruding plate coupler 113C fixed to the support member 111 of the second ladder body 110B are used, and the support members 111 are connected to each other by inserting an auxiliary rope SR into each auxiliary insertion hole 113S. As a result, even if the connection between the protruding plate 113 and the intermediate plate 120 comes loose due to an unforeseen incident, the connection between the first ladder body 110A and the second ladder body 110B will not be released due to the effect of the auxiliary rope SR, and workers using the ladders as scaffolding can be protected from accidents.

[0045] When using the scaffolding device 100 of the present invention, the scaffolding is formed as described above, and then the scaffolding is positioned as shown in Fig. 1. Specifically, for example, the rear end of the scaffolding 100 is connected to a steel tower, and the front end of the scaffolding 100 is hung on the power transmission line, thereby allowing the scaffolding 100 to be positioned below the power transmission line. A connecting bar 114 shown in Fig. 2 can be used to connect the rear end of the scaffolding 100 to the steel tower. In other words, a part of the steel tower and the connecting bar 114 are fastened together using a separately prepared rope or the like.

[0046] On the other hand, when hooking the tip end of the scaffolding device 100 onto the power line, the locking shaft member 140 and overhead line locking body 150 shown in Figure 8 can be used. Figure 8(a) is a plan view from above of the locking shaft member 140 attached to the tip end of the second ladder body 110B, and Figure 8(b) is a plan view from above of the overhead line locking body 150 attached to the locking shaft member 140.

[0047] As shown in Figure 8(a), the locking shaft member 140 includes a locking shaft member 141 and left and right locking couplers 142, and is detachably attached to the tip end of the second ladder body 110B. Specifically, the two locking couplers 142 are respectively fitted onto the left support member 111L and the right support member 111R, and the locking shaft member 141 is inserted into the insertion holes provided in the locking couplers 142, thereby attaching the locking shaft member 140 to the second ladder body 110B. A bolt or thumbscrew is used as the locking shaft member 141, and by tightening the bolt or the like, the locking shaft member 140 is firmly fixed to the support member 111, and by loosening the bolt or the like, the locking shaft member 140 can be easily removed from the support member 111.

[0048] The overhead wire locking body 150 is configured to include an arm 151 and a hook 152 provided at the tip of the arm 151. One end of the arm 151 (the left side in the figure) is attached to the locking shaft member 141. At this time, it is preferable to attach the arm 151 so that it can rotate around the axis of the locking shaft member 141.

[0049] The scaffolding device 100, to which the locking shaft member 140 and the overhead line locking body 150 are attached, is suspended from the power line via the arm 151. Specifically, the arm 151 is rotated so that the hook 152 is positioned upward, and the hook 152 is hooked onto the power line, thereby being suspended from the power line. Note that the locking shaft member 140 and the overhead line locking body 150 may also be attached to the rear end side of the first ladder body 110A, and the hook 152 may be hooked onto part of the steel tower.

[0050] Depending on the situation in which the scaffolding device 100 of the present invention is used, the scaffolding consisting of the first ladder body 110A and the second ladder body 110B may not provide sufficient working area. In this case, as shown in Figure 9, the scaffolding can be expanded by further connecting an independent ladder body 110C. Like the first ladder body 110A and the second ladder body 110B, this independent ladder body 110C has a left support member 111L and a right support member 111R, and multiple (three in the figure) step members 112 arranged in the width direction are attached to the left support member 111L and the right support member 111R. In addition, a connecting bar 114 can be attached to the tip of the independent ladder body 110C between the left support member 111L and the right support member 111R.

[0051] The first ladder body 110A and the second ladder body 110B are always connected by a connecting structure, but the independent ladder body 110C is connected to the second ladder body 110B only when necessary using a connecting body 160. Note that connecting bodies 160 are provided for use on the left side and right side, and can be configured in the same manner as the sliding body 130 shown in Figure 6, for example.

[0052] When connecting the independent ladder body 110C to the second ladder body 110B using the connector 160, first the left connector 160 is inserted through a portion (tip side) of the left support member 111L of the second ladder body 110B and through a portion (rear end side) of the left support member 111L of the independent ladder body 110C, and similarly the right connector 160 is inserted through a portion (tip side) of the right support member 111R of the second ladder body 110B and through a portion (rear end side) of the right support member 111R of the independent ladder body 110C. Then, the left connector 160 is tightened with a bolt or the like, and the right connector 160 is tightened with a bolt or the like, thereby connecting the independent ladder body 110C to the second ladder body 110B. On the other hand, when removing the independent ladder body 110C from the second ladder body 110B, the fastening by the bolts or the like is released, and then the left and right connecting bodies 160 are removed from the left support member 111L and the right support member 111R. When using the independent ladder body 110C connected to the second ladder body 110B, it is advisable to attach the locking shaft member 140 and the overhead line locking body 150 to the tip side. [Industrial Applicability]

[0053] The scaffolding device of the present invention can be used as a scaffolding for work related to various overhead lines, and can be particularly suitably used as a scaffolding for maintenance and inspection work on power transmission lines, etc. According to the present invention, maintenance and inspection work on power transmission lines, etc. can be carried out safely and efficiently, and as a result, stable power transmission can be maintained, that is, electricity, which is a social infrastructure, can be properly maintained. Considering this, the present invention can be said to be not only applicable industrially but also to be expected to make a great contribution to society. [Explanation of symbols]

[0054] 100 Scaffolding device of the present invention 110 (Scaffolding equipment) ladder body 110A (of the ladder body) First ladder body 110B (of the ladder body) Second ladder body 110C (Scaffolding equipment) independent ladder body 111 (Ladder body) support material 111L Left support material (of the support materials) 111R Right support material (of the support materials) 112 (Ladder) Step material 113 (Ladder body) protruding plate 113C (Ladder body) protruding plate coupler 113H (Protruding plate) Protruding plate insertion hole 113L Left protruding plate (among protruding plates) 113R Right protruding plate (among protruding plates) 114 (ladder body) connecting bar 120 (Scaffolding equipment) intermediate board 120H (Intermediate plate) Intermediate plate insertion hole 120P (connection structure) connecting shaft material 130 (connected structure) slide body 130L Left slide body (of the slide body) 130R Right slide body (of the slide body) 131 (Sliding body) splice plate 132 (Sliding body) curved plate 140 (Scaffolding equipment) locking shaft member 141 (of locking shaft members) locking shaft members 142 (of a locking shaft member) locking coupler 150 (Scaffolding equipment) overhead line anchor 151 (Overhead line locking body) arm 152 (Overhead line locking body) hook 160 (Scaffolding) Connector HK Hook LD ladder body SR (Scaffolding equipment) auxiliary rope WR Wire Rope

Claims

1. A device for securing footholds below overhead wires, A first ladder body including a support member consisting of a left support and a right support, and a step member; A second ladder body including the support material and the step material; a connecting structure including a left intermediate plate having two insertion holes and a right intermediate plate having two insertion holes; The first ladder body and the second ladder body are configured such that two or more step members, each perpendicular or substantially perpendicular to the axial direction of the support member, are arranged at intervals in the axial direction of the support member and are attached to the left support member and the right support member, A protruding plate having an insertion hole is attached to the end of each of the left and right support columns, The connecting structure rotatably connects the first ladder body and the second ladder body by a pin connection in which an axle is inserted through the insertion hole of the protruding plate of the left support column of each of the first ladder body and the second ladder body and the insertion hole of the left intermediate plate, and a pin connection in which an axle is inserted through the insertion hole of the protruding plate of the right support column of each of the first ladder body and the second ladder body and the insertion hole of the right intermediate plate, When the second ladder body is rotated so as to fold toward the first ladder body, the first ladder body and the second ladder body are arranged so as to overlap each other, When the support material of the first ladder body and the support material of the second ladder body are arranged coaxially or approximately coaxially, a continuous foothold is formed by the first ladder body side and the second ladder body, By arranging the first ladder body and the second ladder body with the scaffolding formed along the overhead wire, a scaffolding can be secured below the overhead wire. A scaffolding device characterized by:

2. the connecting structure further includes a cylindrical left slide body that is fitted onto the left support column, and a cylindrical right slide body that is fitted onto the right support column, the left slide body fitted onto the left support column is slidable in the axial direction of the left support column, the right slide body, which is extrapolated to the right support column, is capable of sliding in the axial direction of the right support column; With the foothold formed, when the left slide body is slid, it is inserted onto the left support of each of the first ladder body and the second ladder body, and when the right slide body is slid, it is inserted onto the right support of each of the first ladder body and the second ladder body, thereby restricting the rotation of the first ladder body and the second ladder body.

2. The scaffolding device according to claim 1.

3. The left sliding body and the right sliding body each include two splice plates disposed opposite to each other and curved plates whose ends are continuous with the splice plates, The splice plate is provided with an insertion hole, With the left slide body inserted onto each of the left supports of the first ladder body and the second ladder body, the left support can be fastened to the curved plate by a bolt inserted into the insertion holes of the two overlapping splice plates, With the right slide body inserted onto the right support columns of the first ladder body and the second ladder body, the right support columns can be fastened to the curved plate by bolts inserted into the insertion holes of the two overlapping splice plates.

3. The scaffolding device according to claim 2.

4. An independent ladder body including the support material and the step material; A cylindrical connector is further provided, The second ladder body and the independent ladder body are detachably connected by inserting the connecting body onto the left support pillars of the second ladder body and the independent ladder body, respectively, and by inserting the connecting body onto the right support pillars of the second ladder body and the independent ladder body, respectively.

2. The scaffolding device according to claim 1.

5. an overhead wire locking body including an arm and a hook provided at the tip of the arm; Further provided is a locking shaft member detachably attached to the end of the support material of the second ladder body, the locking shaft member is attached to the left support column and the right support column while being perpendicular or approximately perpendicular to the axial direction of the support column; the overhead wire locking body is attached to the locking shaft member so that the arm can rotate around the axis of the locking shaft member; By hooking the hook of the overhead line anchoring body onto the overhead line, the first ladder body and the second ladder body are suspended and supported by the overhead line.

2. The scaffolding device according to claim 1.

6. the left support pillar and the right support pillar are formed of CFRP, The surface of the step material is treated with an anti-slip coating.

2. The scaffolding device according to claim 1.

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