Prefabricated scaffolding

Abstract

To provide a prefabricated scaffolding that can be easily installed while ensuring safety. [Solution] The prefabricated scaffolding 1 according to this embodiment comprises a fixing member 3 that is fixed to electrical equipment, and a plurality of portable scaffolding members 4, each having a single step 43 and varying heights. The plurality of scaffolding members 4 are arranged so that the relatively taller scaffolding members 4 are connected to the fixing member 3, and the relatively lower scaffolding members 4 are sequentially connected to the relatively taller scaffolding members 4, thereby forming a staircase-like scaffolding.

Description

Technical Field

[0001] The present disclosure relates to an assembled scaffold used when working on electrical equipment.

Background Art

[0002] Conventionally, when working at heights, for example, a stepladder, a ladder, or a portable workbench as described in Patent Document 1 has been used.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in recent years, the use of stepladders and ladders may be prohibited or restricted from the viewpoint of safety. In this case, although it may be considered to use a portable workbench, in an electrical room where electrical equipment is densely arranged, the passageway is relatively narrow, so it may not be possible to carry it in, or even if a foldable one is carried in, it may not be possible to unfold and install it. Also, even if trying to use a single-pipe scaffold that assembles so-called single-pipe pipes, the assembly work period takes a long time, so the work cannot be carried out quickly, and there is a problem that the rental cost and installation cost of the equipment become high.

[0005] The present disclosure has been made in view of the above circumstances, and its object is to provide an assembled scaffold that can be easily installed while ensuring safety.

Means for Solving the Problems

[0006] A prefabricated scaffolding according to one aspect of the present disclosure comprises a fixing member that is fixed to electrical equipment, and a plurality of portable scaffolding members having one step and each having a different height, wherein the plurality of scaffolding members form a stepped scaffolding by connecting the relatively taller scaffolding members to the fixing member and sequentially connecting the relatively lower scaffolding members to the relatively taller scaffolding members. [Brief explanation of the drawing]

[0007] [Figure 1] A schematic diagram showing an example of the configuration of a prefabricated scaffolding according to the embodiment. [Figure 2] A schematic diagram showing examples of electrical equipment layouts and work objects. [Figure 3] A schematic diagram showing an example of the configuration of the fixing member. [Figure 4] A schematic diagram showing an example of the configuration of fixing screws. [Figure 5] A schematic diagram showing a basic structural example of scaffolding components. [Figure 6] A schematic diagram showing examples of scaffolding component dimensions. [Figure 7] A schematic diagram showing examples of how scaffolding members are connected and installed. [Figure 8] A schematic diagram illustrating other uses of prefabricated scaffolding. [Figure 9] A schematic diagram showing examples of how the fixing members are fixed. [Modes for carrying out the invention]

[0008] The embodiments will now be described with reference to the drawings. As shown in Figures 1(a) and (b), the prefabricated scaffolding 1 according to this embodiment is intended for use in performing work on electrical equipment such as a cubicle-type high-voltage power receiving facility (hereinafter simply referred to as cubicle 2). In this embodiment, as an example, a cubicle 2 with a height (H1) of approximately 2300 mm is assumed.

[0009] The prefabricated scaffolding 1 consists of a fixing member 3 that is fixed to the cubicle 2, and multiple portable scaffolding members 4 of different heights. Note that the electrical equipment does not necessarily have to be the cubicle 2; any relatively heavy equipment with a generally rectangular or cubic enclosure can be used with the prefabricated scaffolding 1.

[0010] In this embodiment, the prefabricated scaffolding 1 comprises three scaffolding members 4: scaffolding member 4A, scaffolding member 4B, and scaffolding member 4C. In this embodiment, the prefabricated scaffolding 1 forms a staircase-like scaffolding that can be ascended and descended to the top surface of the cubicle 2 using a commercially available work platform 5. The number of scaffolding members 4 is not limited to this, and a configuration using a different number of scaffolding members 4 may be used, as shown in Figure 9 which will be described later, or a configuration without using a work platform 5 may be used.

[0011] Here, we will describe an example of work performed on the top surface of the cubicle 2. As shown in Figure 2(a), for example, multiple cubicles 2 are arranged adjacent to each other in the electrical room 6, and above them, cable racks 7 for laying electrical wiring may be provided. Workers then climb up and down to the top surface of the cubicle 2 to perform tasks such as repairing the cable racks 7 or inspecting the electrical wiring. In other words, in this embodiment, the cable racks 7 or the wiring laid thereon are assumed to be the objects of work. Note that Figure 2 is a schematic representation to explain the arrangement of electrical equipment and may not necessarily match the actual scale, and other electrical equipment besides the cubicle 2 may also be arranged alongside it.

[0012] In this case, as shown in Figure 2(b), the width (W1) of the passage 8A between adjacent cubicles 2 and the width (W2) of the passage 8B between opposing cubicles 2 are kept to the minimum necessary to increase the capacity of the electrical room 6. For example, the width (W1) of passage 8A may be approximately 600 mm, and the width (W2) of passage 8B may be approximately 1000 mm. In other words, the space available for work may be limited near electrical equipment such as cubicles 2 that are to be lifted and lowered.

[0013] Therefore, with conventional portable work platforms, it may not be possible to transport them into the electrical room 6 using the passageway 8 or to install them near the cubicle 2. Also, when using general scaffolding made of single pipes, there are problems such as delays in the start of work and high costs, as mentioned above. Furthermore, from a safety standpoint, the use of ladders and step ladders may be prohibited, or the types of work that can be performed may be limited. Therefore, in this embodiment, a prefabricated scaffolding 1 that can be easily installed while ensuring safety is adopted.

[0014] As shown in Figure 3, the fixing member 3 of the prefabricated scaffolding 1 has two column members 31 arranged along the wall surface of the cubicle 2, and a plurality of inter-column connecting members 32 that connect the column members 31 at multiple positions separated vertically. The column members 31 are formed as L-shaped flat plates in side view, with the shorter side of the L fixed to the upper surface of the cubicle 2, and the longer side of the L extending vertically along the wall surface. In other words, in this embodiment, the fixing member 3 is directly fixed to the cubicle 2. In this embodiment, the fixing member 3 is installed in such a way that a gap is formed between it and the wall surface of the cubicle 2. Also, because the fixing member 3 is formed as a flat plate, the amount that it protrudes from the side surface of the cubicle 2 is small. Note that the column members 31 can be made lighter by cutting out material, or by using square timbers, round bars, or pipes.

[0015] Further, a cushioning material 33 is provided on the surface of each column member 31 on the side of the cubicle 2. The main purpose of this cushioning material 33 is to prevent damage to the cubicle 2, but it is also possible to prevent the column member 31 from floating by adhering it with the side of the cubicle 2 as the adhesive surface. Further, the cushioning material 33 also functions as a gap forming member that forms and maintains a gap that allows the scaffolding member 4 to be hooked between the fixing member 3 having a relatively thin shape and the cubicle 2. Thereby, even when the lower end side of the column member 31 is not fixed, it becomes possible to easily hook the scaffolding member 4. Note that the column member 31 may be configured to contact the wall surface of the cubicle 2 without providing the cushioning material 33.

[0016] Also, the vertical length (L11) of the column member 31 is shorter than the height (H1) of the cubicle 2. For example, in the present embodiment, the length (L11) of the column member 31 is approximately 1500 mm. This is to prevent the lower end from interfering with the floor surface when fixing to the cubicle 2 having a relatively low height. For example, the column member 31 having the above length can be attached to the cubicle 2 having a height ranging from approximately 1600 mm to approximately 2300 mm. When the target electrical equipment is limited, it is also possible to use a column member 31 having a length corresponding to the height of the electrical equipment or to fix the lower end side of the column member 31 to the floor surface.

[0017] Also, the distance (L12) between the column members 31 is set to a length that allows the protruding portion 41 (see FIG. 5) of the scaffolding member 4 described later to be inserted. This distance (L12) is defined by the inter-column connecting member 32. This inter-column connecting member 32 is for connecting the scaffolding member 4 as described later, but also functions as a reinforcing member for defining the distance (L12) between the column members 31 and maintaining the shape of the fixing member 3.

[0018] In this embodiment, four inter-column connecting members 32 are provided. They are formed in a flat plate shape and fixed to the surfaces of the respective column members 31 by welding, bolt fastening, or the like. At this time, the thickness (L13) and height (L14) of the inter-column connecting members 32 are such that the wall portion 42 (see FIG. 5) of the scaffolding member 4 described later can be hooked. Also, a plurality of inter-column connecting members 32 are provided at positions spaced apart in the vertical direction. Further, the distance (L15) between the inter-column connecting members 32 is such that the protruding portion 41 and the wall portion 42 of the scaffolding member 4 can be inserted.

[0019] Note that the number of the inter-column connecting members 32 is an example, and it is considered that the basic shape of the fixing member 3 can be maintained if at least two are provided at positions on the upper end side and the lower end side rather than the center. Also, although not shown, the inter-column connecting members 32 can be configured to be provided at a position that does not protrude from the surface of the column member 31, that is, between the column members 31. By providing this cushioning material 33, a gap that can hook the scaffolding member 4 is formed between the flat fixing member 3 and the cubicle 2.

[0020] The fixing member 3 having such a configuration is fixed using the screw holes 21 provided on the top surface of the cubicle 2. These screw holes 21 are for eye bolts provided in advance for relatively heavy electrical equipment such as the cubicle 2, and are not newly provided for the assembled scaffolding 1. In other words, the fixing member 3 is fixed using the existing structure of the electrical equipment.

[0021] Specifically, hole portions 34 are provided on the short sides of the L shape of the column members 31, and each column member 31 is fixed by fixing screws 9 with the hole portions 34 aligned with the screw holes 21. Therefore, the lateral width (L16) of the fixing member 3 is such that the positions of the hole portions 34 and the screw holes 21 coincide.

[0022] As shown in Figure 4, the fixing screw 9 has a square frame-shaped head with threads at its lower end. The head of the fixing screw 9 is formed, for example, by making a ring shape from a rod-shaped base material, and the width of the inner circumference (L21), the length of the inner circumference (L22), and the thickness of the frame-shaped part (L23, L24) in Figure 4 are all sized to be gripped by hand. In other words, the head of the fixing screw 9 is formed in a frame shape that is sized to be grasped by a worker. Furthermore, as shown in Figure 1, the fixing screw 9 is attached near the end of the cubicle 2, so that the worker can ascend and descend the assembly scaffolding 1 while gripping the head, thereby increasing safety during ascent and descent. Note that the fixing screw 9 may have other shapes, such as an annular head, as long as it is grippable by a worker.

[0023] Furthermore, in the case of a cubicle 2 of approximately 2300 mm or less, as in this embodiment, it is considered that by using a work platform 5 or a two-step platform, it is possible to reach the top and safely perform the work of fixing the fixing member 3. Therefore, the modular scaffolding 1 can be used in a manner in which the fixing member 3 is fixed to the cubicle 2 at the start of work and the fixing member 3 is removed after the work is completed. In addition, if the fixing member 3 does not obstruct passage, the fixing member 3 can basically be fixed to the cubicle 2, and the modular scaffolding 1 can be assembled by connecting only the scaffolding members 4 during work.

[0024] As shown in Figure 5(a), the scaffolding member 4 has one tread 43 provided at the upper end, four legs 44 provided at the four corners on the lower side of the tread 43, and one or more inter-leg connecting members 45 connecting the legs 44. Although not shown in the figure, these inter-leg connecting members 45 are fixed to the legs 44 by welding or bolting. Note that Figure 5 shows the structure of scaffolding member 4A as an example, but each scaffolding member 4 has the same basic structure, although the position of the tread 43 in the height direction differs. Therefore, in this embodiment, a scaffolding member 4 of a different height means that the position where the tread 43 is provided in the height direction is different. Note that the shape and scale of each scaffolding member 4 described below are examples and are not limited to them, and may not necessarily match the actual product.

[0025] Furthermore, in this embodiment, the scaffolding member 4 is provided with two protrusions 41 and wall portions 42 at positions separated in the vertical direction. Of these, the uppermost protrusion 41 is formed integrally with the tread 43. On the other hand, the second lower protrusion 41 is formed by fixing a connecting member 46, which is roughly L-shaped in cross-sectional view, between the legs 44, as shown as an example in Figure 5(b). In this case, the multiple protrusions 41 are each provided on the same side of the tread 43 in plan view. Note that the second and subsequent protrusions 41 and wall portions 42 can also be formed using a member in which the leg-to-leg connecting member 45 and the connecting member 46 are integrated into a single structure.

[0026] Furthermore, the projection 41 is set to a length such that the amount of projection (D1) from the end of the tread 43 is equal to or greater than the thickness (L13) of the inter-column connecting member 32, and the distance (D2) between the leg portion 44A and the wall portion 42A is equal to or greater than the thickness (L13) of the inter-column connecting member 32. Also, the length (D3) of the wall portion 42 from the lower surface of the projection 41 is set to a length that allows it to hook onto at least the inter-column connecting member 32 or the inter-leg connecting member 45 of another scaffolding member 4. In this case, it is desirable that the length (D3) of the wall portion 42 be approximately 1 / 3 or more of the height (L14) of the inter-column connecting member 32 or the height (D4) of the inter-leg connecting member 45, in order to prevent the hook from coming loose even if the scaffolding member 4 tilts. In this embodiment, the height (L14) of the inter-column connecting member 32 and the height (D4) of the inter-leg connecting member 45 are the same, and the length (D3) of the wall section 42 is also the same as the height (L14) of the inter-column connecting member 32 and the height (D4) of the inter-leg connecting member 45.

[0027] Furthermore, a packing 11 made of rubber or fabric is provided on the inner surface of the wall section 42, that is, the surface facing the leg section 44. This prevents the scaffolding member 4 from coming loose when it is connected to the fixing member 3 or other scaffolding members 4, as will be described later. By providing a packing 11 with appropriately adjusted thickness and elasticity, the column-to-column connecting member 32 or the leg-to-leg connecting member 45 can be tightly clamped, making it difficult to come loose. Moreover, the hooking structure itself remains unchanged, and it is possible to make it difficult to come loose without using tools, so the ease of assembly is not compromised. It is also possible to provide packing 11 on the leg section 44 side or on both the wall section 42 side and the leg section 44 side. However, it is not always necessary to provide packing 11. Furthermore, a mechanism to prevent detachment can be provided, which involves inserting a pin that penetrates the wall section 42 and the column-to-column connecting member 32, or the wall section 42 and the leg-to-leg connecting member 45.

[0028] In this embodiment, as shown in Figure 6(a), the scaffolding member 4A has a height (L31) of 1850 mm to the step board 43A. In this embodiment, the step board 43A is sized so that a worker's feet do not extend beyond it when standing on it, for example, it is formed in the shape of a roughly rectangular flat plate with a side length (L32) of 300 mm. The step board 43A is treated to prevent slipping, for example by creating irregularities on the surface or attaching rubber material, although this is not shown in the figures. Furthermore, the size, height, and shape of the step board 43 shown in each figure are examples and are not limited thereto; for example, reinforcing braces can be provided on the underside or reinforcing walls can be provided on the outer edge.

[0029] On one side of the step plate 43A, which is the right side in the illustration, there is a projection 41A that protrudes outward and a wall portion 42A that extends downward from the tip of the projection 41A. In addition, a leg-to-leg connecting member 45A is provided between the leg portions 44. The width of the projection 41A in the vertical direction (L33) is smaller than the width between the leg portions 44A (L34) and the distance between the column members 31 (L12). By making the width of the projection 41A (L33) close to the width between the leg portions 44A (L34) and the distance between the column members 31 (L12), misalignment during connection can be suppressed.

[0030] As shown in Figure 6(b), the scaffolding member 4B has a height (L41) of 1400 mm and a tread 43B that is roughly rectangular in shape with a side length (L42) of 300 mm. This tread 43B is also treated with an anti-slip finish. Legs 44B are provided at the four corners of the underside of the tread 43B, and multiple inter-leg connecting members 45B are provided between each of the legs 44B.

[0031] Furthermore, on the right-hand side of the tread 43B, there is a projection 41B that protrudes outward, and a wall portion 42B that extends downward from the tip of the projection 41B. Below that, there is a second projection 41B and wall portion 42B. These projections 41B and wall portions 42B have the same shape as the projection 41A and wall portion 42A shown in Figure 5(b). Therefore, the width (L43) of the projection 41 is smaller than the distance between the legs 44 and the distance between the column members 31. Also, the width between the legs 44B (L44) is set to be the same as the width between the legs 44A (L34).

[0032] As shown in Figure 6(c), the scaffolding member 4C has a tread 43C that is roughly rectangular in shape, with a height (L51) of 950 mm and a side length (L52) of 300 mm. This tread 43C is also treated with an anti-slip finish. Legs 44C are provided at the four corners of the underside of the tread 43C, and inter-leg connecting members 45C are provided between each of the legs 44C.

[0033] Furthermore, on the right-hand side of the tread 43C, there is a projection 41C that protrudes outward, and a wall portion 42C that extends downward from the tip of the projection 41C. Below that, there is a second projection 41C and wall portion 42C. These projections 41C and wall portions 42C have the same shape as the projection 41 and wall portion 42 shown in Figure 5(b). Therefore, the width (L53) of the projection 41C is smaller than the distance between the legs 44 and the distance between the column members 31. Also, the width (L54) between the legs 44C is set to be the same as the width (L34) between the legs 44A.

[0034] Thus, each scaffolding member 4 is formed to be relatively small, making it easy to transport using the passage 8 of the electrical room 6 if it is used individually. In addition, each scaffolding member 4 has the same shape when viewed from above in a plan view. The number of protrusions 41 and wall portions 42 is not limited to these; it is also possible to have only one, or to have three or more protrusions 41 and wall portions 42 in the vertical direction, as illustrated in Figure 8(b) described later.

[0035] Each scaffolding member 4 is connected to the others by inserting its respective protruding portion 41 between the legs 44 of the relatively taller scaffolding member 4 and hooking its respective wall portion 42 onto the leg-to-leg connecting member 45 of the relatively taller scaffolding member 4. In addition, the scaffolding member 4 with the highest position of the tread 43 among the connected scaffolding members 4 is connected to the fixing member 3 by inserting its protruding portion 41 between the column members 31 of the fixing member 3 and hooking its wall portion 42 onto the column-to-column connecting member 32. As a result, each scaffolding member 4 is connected to the others in a manner that restricts relative movement in the front-to-back direction and the left-to-right direction perpendicular to the front-to-back direction, assuming the direction in which the protruding portion 41 is inserted is the front-to-back direction. Similarly, the scaffolding members 4 connected to the fixing member 3 are also connected to the fixing member 3 in a manner that restricts relative movement in the front-to-back direction and the left-to-right direction.

[0036] As a result, by placing the work platform 5 next to the scaffolding member 4C as shown in Figure 1, a staircase-like scaffolding is formed that allows ascent and descent from the floor to the top of the cubicle 2. In this embodiment, the height of the cubicle 2 (H1) is 2300 mm, the height of the work platform 5 (L1) is 500 mm, and the so-called risers of each step (L2, L3, L4, L5) are each 450 mm. Although the risers described above are larger than those of ordinary houses and buildings, considering that commercially available work platforms 5 have a riser of 500 mm, a riser of about 450 mm in a work site is sufficient for safe ascent and descent. Also, in Figure 1(a), the scaffolding members 4 and the work platform 5 are arranged in a straight line to make the configuration of the assembled scaffolding 1 easier to understand, but the overall length in the left-right direction can be shortened by placing the work platform 5 either above or below the scaffolding member 4C as shown.

[0037] Furthermore, each scaffolding member 4 has a tread 43 that is roughly square-shaped, and each leg connecting member 45 is provided between the legs 44. Therefore, for example, in the case of scaffolding member 4B, as shown by the dashed arrows in Figure 7(a), it can be connected to scaffolding member 4A from the other three sides of the tread 43A that do not have a protruding portion 41A, that is, from three directions of the scaffolding member 4. This allows for connection not only perpendicular to the cubicle 2 as shown in Figure 1, but also along the cubicle 2 as shown in Figure 7(b) depending on the width of the passage 8, or the direction of connection can be changed midway as shown in Figure 7(c).

[0038] According to the embodiments described above, the following effects can be obtained. The prefabricated scaffolding 1 according to this embodiment comprises a fixing member 3 that is fixed to electrical equipment, and a plurality of portable scaffolding members 4 each having a single step 43 and being of different heights. The plurality of scaffolding members 4 are arranged so that the relatively taller scaffolding members 4 are connected to the fixing member 3, and the relatively lower scaffolding members 4 are sequentially connected to the relatively taller scaffolding members 4, thereby forming a staircase-like scaffolding.

[0039] This allows each scaffolding member 4 to be relatively small enough to be transported into the electrical room 6, and after transport, they can be connected to each other to form a stepped scaffolding. Furthermore, by connecting the scaffolding members 4 to the fixing members 3 that are fixed to the electrical equipment, the scaffolding members 4 are prevented from shifting. Therefore, installation can be done easily while ensuring safety.

[0040] The scaffolding member 4 can be connected to the relatively taller scaffolding member 4 from three sides of the rectangular plate-shaped tread 43. This makes it possible to change the installation configuration of the scaffolding member 4 according to the work site and to install it in a way that does not block narrow passages 8, thereby improving convenience.

[0041] Each scaffolding member 4 has a protruding portion 41 that projects outward from one side of a rectangular tread 43, a wall portion 42 that extends downward from the tip of the protruding portion 41, four legs 44 provided at the four corners of the tread 43, and one or more inter-leg connecting portions that connect the legs 44. The protruding portion 41 is inserted between the legs 44 of a relatively taller scaffolding member 4, and the wall portion 42 is hooked onto the inter-leg connecting portion 45 of a relatively taller scaffolding member 4 to connect them. This allows for easy assembly and disassembly of the modular scaffolding 1, that is, the connection and disconnection of the scaffolding members 4, without the use of tools. Furthermore, by restricting the relative movement of each scaffolding member 4, the scaffolding members 4 are prevented from shifting during ascent and descent, thus ensuring safety.

[0042] The fixing member 3 has two column members 31 arranged along the wall surface of the electrical equipment, and a plurality of inter-column connecting members 32 that connect the column members 31 at multiple positions separated vertically. The scaffolding member 4 is connected to the fixing member 3 by having its protruding portion 41 inserted between the column members 31 of the fixing member 3 and its wall portion 42 hooked onto the inter-column connecting members 32. This makes it possible to easily connect the fixing member 3 and the scaffolding member 4, that is, to position the assembled scaffolding 1, without using any tools.

[0043] The scaffolding member 4 has multiple protruding parts 41 and wall parts 42 at positions separated in the vertical direction, and is connected at multiple positions in the vertical direction. As a result, it can be connected to each other at multiple positions, making it less likely to come apart and improving stability.

[0044] The fixing member 3 is secured using the screw holes 21 for eye bolts provided on the top surface of the electrical equipment. The fixing screws 9 that secure the fixing member 3 have heads shaped like a frame, large enough for a worker to grip. This allows the fixing member 3 to be secured without modifying the structure of the electrical equipment. Furthermore, safety is improved because the heads of the fixing screws 9 can be grasped when ascending or descending the assembled scaffolding 1.

[0045] Furthermore, since the stepping board 43 is formed in a square shape and legs 44 are provided at the four corners of its underside, even if the edge of the stepping board 43 is stepped on, it will be supported by the legs 44. In other words, by making the stepping board 43 so that it does not extend beyond the outer edge of the legs 44, the risk of the scaffolding member 4 tilting can be reduced.

[0046] In the embodiment, a configuration using a work platform 5, scaffolding member 4A, scaffolding member 4B, and scaffolding member 4C was illustrated. However, as shown in Figure 8(a), for example, if the cubicle 2A has a height (H61) of approximately 1900 mm or less, a staircase-like scaffolding that allows ascent and descent to the top surface of the cubicle 2A can be formed by using the work platform 5, scaffolding member 4B, and scaffolding member 4C. In this case, the riser height (L61) of the top step will be approximately 500 mm or less, making it sufficiently possible to ascend and descend.

[0047] Furthermore, as shown in Figure 8(b), it is also possible to use a scaffolding member 4D that is lower than the scaffolding member 4C, without using the work platform 5. In this case, if the scaffolding member 4 needs to be higher, stability can be increased by providing three or more protruding parts 41 and wall parts 42 in the vertical direction. Although not shown in the figures, it is also possible to form a staircase-like scaffolding that makes it easier to ascend and descend by using the work platform 5 and four scaffolding members 4, with a smaller rise per step than in the embodiment. Considering the effort involved in actual installation, it is thought that the assembly-type scaffolding 1 can be used without significantly compromising practicality if it is constructed with three or four scaffolding members 4.

[0048] Furthermore, actual cubicles 2 can be relatively long in depth, and for example, when fixing the fixing member 3 to the side as shown in Figure 9(a), the spacing between the screw holes 21 (L71) may be about 1500 mm. In that case, by making the width between the holes 34 (L72) longer, as in the fixing member 3A, the position of the holes 34 can be aligned with the position of the screw holes 21. Note that Figures 9(a) and (b) show a configuration in which the assembly scaffolding 1 is installed on the side of the cubicle 2, with the upper side with the handles facing forward.

[0049] In this case, the connection position of the scaffolding member 4 can be changed within the length range of the column-to-column connecting member 32, thereby improving usability. Furthermore, if there is a prohibited area (X) on the top surface of the cubicle 2 where it is forbidden to place feet, such as an opening for wiring or an exhaust vent, safety during ascent and descent can be ensured by shifting the lifting position.

[0050] Alternatively, as shown in Figure 9(b), when using a relatively narrow fixing member 3, a configuration using an auxiliary member 10 can be used. This auxiliary member 10 is formed in the shape of a plate having a hole 101 for fixing to the screw hole 21 of the cubicle 2 and two screw holes 102 arranged at a predetermined interval (L81) for fixing the fixing member 3. In this case, by providing multiple pairs of screw holes 102, the position in which the fixing member 3 is fixed can be changed to some extent.

[0051] In this embodiment, a configuration in which the fixing member 3 is directly fixed to the cubicle 2 was illustrated. However, if sufficient installation space can be secured, the fixing member 3 can also be indirectly fixed to the electrical equipment by fixing it to the floor or by providing a separate fixing member.

[0052] In this embodiment, a tread 43 with a roughly square shape is shown as an example, but a rectangular shape can be used. In that case, it is sufficient to make it connectable from one direction of the scaffolding member 4. Alternatively, the tread 43 can be configured with protrusions 41 on two directions.

[0053] The embodiments described above are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0054] In the drawing, 1 is a prefabricated scaffolding, 2 and 2A are cubicles, 3 is a fixing member, 4 and 4A to 4D are scaffolding members, 9 is a fixing screw, 21 is a screw hole, 31 is a column member, 32 is a column connecting member, 41 and 41A to 41C are protruding parts, 42 and 42A to 42C are wall parts, 43 and 43A to 43C are treads, 44 and 44A to 44C are legs, and 45 and 45A to 45C are leg connecting members.

Claims

1. A fixing member that is fixed to the electrical equipment, It comprises multiple portable scaffolding members, each having a single step and varying heights, A prefabricated scaffolding system in which a plurality of scaffolding members are assembled to form a stepped scaffolding by connecting the relatively taller scaffolding members to the fixing members and sequentially connecting the relatively lower scaffolding members to the relatively taller scaffolding members.

2. The assembly-type scaffolding according to claim 1, wherein the scaffolding member is connectable from three sides of the tread, which is formed in the shape of a rectangular plate.

3. The assembly-type scaffolding according to claim 1, wherein the scaffolding member has a projection that protrudes outward from one side of the rectangular plate-shaped step board, a wall portion extending downward from the tip of the projection, four legs provided at the four corners of the step board, and one or more inter-leg connecting members connecting the legs, and the projecting portion is inserted between the legs of the relatively taller scaffolding member, and the wall portion is hooked onto the inter-leg connecting member of the relatively taller scaffolding member to connect them.

4. The fixing member comprises two column members arranged along the wall surface of the electrical equipment, and a plurality of inter-column connecting members connecting the column members at multiple positions separated vertically. The assembly-type scaffolding according to claim 3, wherein the scaffolding member is connected to the fixing member by the projection being inserted between the column members of the fixing member and the wall being hooked onto the column-to-column connecting member.

5. The scaffolding member has multiple protruding portions and wall portions at vertically separated positions and is connected at multiple positions, as described in claim 3 or 4.

6. The aforementioned fixing member is secured using the screw holes for eye bolts provided on the top surface of the electrical equipment. The assembly scaffolding according to claim 1, wherein the fixing screw for fixing the fixing member has a head that is shaped like a frame and is large enough to be grasped by a worker.

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