Opening / closing device mounting structure

Abstract

To reduce localized pressure on the surface of a fire-resistant covering material that makes up a wooden frame.SOLUTION: In an opening / closing device mounting structure in which an opening / closing device 1 is fastened to a wooden frame X whose surface is formed of a fire-resistant covering material x2, a base plate 40 having an area larger than a fastening surface 32a1 is sandwiched between the surface of the fire-resistant covering material x2 and the fastening surface 32a1 of the opening / closing device 1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a switchgear installation structure in which a switchgear is fastened to a wooden frame whose surface is formed with a fire-resistant covering material. [Background technology]

[0002] A typical shutter device comprises an opening / closing body that operates to close a space, a guide rail that guides the opening / closing body in the vertical direction, and a storage section (shutter box) that stores the opening / closing body above it (see, for example, Patent Document 1). In recent years, large building frameworks have been constructed from wood, and large shutter devices such as heavy-duty shutters are sometimes installed on these wooden frameworks. The walls of the wooden framework are made of a wooden base material with a fire-resistant covering material such as gypsum board superimposed on the surface. The shutter device has the support brackets of the storage section, the guide rails, and other components fastened to the surface of the fire-resistant covering material with screws or the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-173028 Summary of the Invention [Problem to be solved by the invention]

[0004] However, according to the above-mentioned prior art, the surface of the fire-resistant covering material is locally pressed by the support bracket, the guide rail, etc., which may cause damage or a decrease in fastening strength. [Means for solving the problem]

[0005] A switchgear installation structure in which a switchgear is fastened to a wooden frame whose surface is formed of a fire-resistant covering material, characterized in that a base plate having an area larger than the fastening surface is sandwiched between the surface of the fire-resistant covering material and the fastening surface of the switchgear. [Effects of the Invention]

[0006] Since the present invention is configured as described above, it is possible to reduce localized pressure on the surface of the fire-resistant covering material that constitutes the wooden skeleton. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a front view showing an example of a switchgear installed by the switchgear installation structure according to the present invention; [Figure 2] 2A and 2B show the opening and closing device installation structure, in which FIG. 2A is a longitudinal cross-sectional view taken along the line (II)-(II) in FIG. 1, and FIG. 2B is a view of the fastening portion as seen from the front side. [Figure 3] FIG. 10 is a side view showing the state in which the pivot bracket is fastened to the surface of the fire-resistant covering material. [Figure 4] 5A and 5B show another example of an opening / closing device installation structure according to the present invention, in which (a) is a longitudinal cross-sectional view of the essential parts, and (b) is a view of the fastening part as seen from the front side. [Figure 5] FIG. 5 is a side view showing how the pivot bracket is fastened to the surface of the fire-resistant covering material in the switchgear installation structure of FIG. [Figure 6] 5A and 5B show another example of an opening / closing device installation structure according to the present invention, in which (a) is a longitudinal cross-sectional view of the essential parts, and (b) is a view of the fastening part as seen from the front side. [Figure 7] 10(a) to 10(c) are enlarged longitudinal cross-sectional views of essential parts showing patterns of the lower end side shape of the base plate. [Figure 8] 5A and 5B show another example of an opening / closing device installation structure according to the present invention, in which (a) is a longitudinal cross-sectional view of the essential parts, and (b) is a view of the fastening part as seen from the front side. [Figure 9] 5A and 5B show another example of an opening / closing device installation structure according to the present invention, in which (a) is a longitudinal cross-sectional view of the essential parts, and (b) is a view of the fastening part as seen from the front side. [Figure 10] FIG. 10 is a longitudinal cross-sectional view of a main portion showing another example of a switchgear installation structure according to the present invention. [Figure 11] 5 is a front view of the fastening portions on both sides of the opening and closing device installation structure of FIG. 4. FIG. [Figure 12] FIG. 10 is a longitudinal cross-sectional view of a main part illustrating the flow of flammable gas generated by the heat of a fire in a conventional switchgear installation structure. DETAILED DESCRIPTION OF THE INVENTION

[0008] Next, an embodiment of the present invention will be described in detail with reference to the drawings. In this specification, the "thickness direction of the opening / closing body" refers to the thickness direction of the opening / closing body in the closed state, and the "width direction of the opening / closing body" refers to a direction that is approximately perpendicular to the opening / closing direction of the opening / closing body, but is not the thickness direction of the opening / closing body. Also, the "opening / closing direction of the opening / closing body" means the direction in which the opening / closing body slides to partition or open the space for opening and closing operations.

[0009] First Embodiment 1 to 3 show an example of a switchgear to which the switchgear installation structure according to the present invention is applied. In this switchgear installation structure A, a switchgear 1 is fixed to a wooden frame X whose surface is formed with a fire-resistant covering material x2.

[0010] The opening and closing device 1 comprises an opening and closing body 10 that opens and closes in the vertical direction, a guide rail 20 that guides the widthwise end of the opening and closing body 10 in the opening and closing direction, and a storage section 30 that extends and stores the opening and closing body 10 on the upper side (see FIG. 1). This opening and closing device 1 is fixed to a wooden skeleton X by sandwiching a base plate 40 between the opening and closing device 1 and the vertical surface of the wooden skeleton X (see FIG. 2).

[0011] The wooden skeleton X is a hanging wall in a wooden building, and is provided above the opening that is opened and closed by the opening and closing device 1, across the width direction. This wooden structure X (hanging wall) is integrally constructed from a hanging piece of wood x1 extending downward from the top across the width, and a fire-resistant covering material x2 covering the vertical surfaces and bottom end surface on both sides of the hanging piece of wood x1 in the thickness direction.

[0012] The hanging wooden piece x1 is formed from a wooden beam or the like that is long in the width direction, and has a suitable thickness of burning space on the surface side.

[0013] The fire-resistant covering material x2 is a fire-resistant board material, such as gypsum board or calcium silicate board, and is provided in a single layer or multiple layers (in the illustrated example, two layers) covering the vertical surfaces on both sides of the thickness direction and the lower end surface of the hanging wood x1.

[0014] The opening / closing body 10 is constructed by connecting multiple slats, each made by bending a horizontally elongated, roughly rectangular metal plate, in the vertical direction to form the opening / closing body main body 11, and connecting a seat plate 12 to the lower end of this opening / closing body main body 11 so that the seat plate 12 can be seated on a fixed surface below (for example, a floor, the ground, a door rail, etc.) (see Figure 1). Other examples of this opening / closing body 10 include a single or multiple panels, or a fire-resistant sheet or net-like material arranged in the opening / closing direction, or an appropriate combination of slats, panels, pipes, sheet or net-like materials, etc.

[0015] The guide rails 20 are provided on both ends of the opening / closing body 10, respectively. Each guide rail 20 is a long member that extends vertically, concavely surrounding the end of the width direction of the opening / closing body 10. The guide rail 20 is erected substantially vertically on the lower immovable surface, and its upper end is inserted into the storage section 30.

[0016] The storage section 30 includes a winding shaft 31 that winds up and unwinds the opening / closing body 10, support brackets 32, 32 that rotatably support the winding shaft 31 at both ends, a drive mechanism 33 that drives and rotates the winding shaft 31, a cover member 34 that covers the periphery of the opening / closing body 10 wound around the winding shaft 31, a lintel member 35 that stores the seat panel 12 when the opening / closing body 10 is fully open, and a connecting member 36 that integrally connects the left and right support brackets 32, the cover member 34, and the lintel member 35, etc. (see Figure 2).

[0017] The winding shaft 31 is formed in a substantially cylindrical shape and is supported by bearings or the like on both sides of the shaft support brackets 32, 32.

[0018] Each support bracket 32 ​​is formed by appropriately processing (for example, pressing or bending) a hard metal plate to integrally form a rectangular plate-shaped fastening piece 32a that follows the vertical plane of the wooden body X and a support piece 32b that protrudes from the fastening piece 32a away from the vertical plane of the wooden body X and supports the end side of the winding shaft 31.

[0019] The fastening piece 32a is formed in a vertically elongated rectangular shape, and the back surface facing the wooden skeleton X serves as a fastening surface 32a1. This fastening surface 32a1 is the surface that is superimposed on the base plate 40 in order to fasten each support bracket 32 ​​to the wooden skeleton X.

[0020] In addition, the fastening piece 32a has a plurality of (three in the illustrated example) through-holes 32a2 spaced apart in the vertical direction, and a fastening device 37 (e.g., a screw, bolt, anchor, etc.) is inserted into each fastening hole 32a2.

[0021] The support piece 32b has a through cutout 32b1 near the center for supporting the winding shaft 31, and curved pieces 32b2, 32b2 at the upper and lower ends for reinforcement.

[0022] The drive mechanism 33 is configured to transmit the rotational force of an opening / closing machine 33a (for example, an electric motor) which is a drive source to the winding shaft 31 by a pulley, a belt, or the like. In the drawing, reference numeral 33b denotes a bracket that supports the opening / closing device 33a, and is integrally connected to the pivot bracket 32.

[0023] The cover member 34 is a member that covers the periphery of the winding shaft 31 in the width direction, and is fixed to a stationary portion of the storage section 30 by a connecting member 36 and a frame (not shown) or the like.

[0024] The lintel member 35 forms an opening through which the opening / closing body 10 passes in the vertical direction. The edge portions of the opening of the lintel member 35 are located on both sides of the seat plate 12 of the opening / closing body 10 in the fully open state, spaced apart in the thickness direction of the opening / closing body (see FIG. 2(a)).

[0025] The connecting member 36 is a long member that spans almost the entire width of the storage section 30, and receives the left and right connecting members 36 from below and connects them together, while also fixing the cover member 34, lintel member 35, etc. together.

[0026] The base plate 40 is a member interposed between the storage section 30 and the wooden frame X in order to fix the storage section 30 having the above-described configuration to the wooden frame X. The base plate 40 is formed in a rectangular plate shape with an area larger than the fastening surface 32a1 of the fastening piece 32a, and has a plurality of through holes 41 so as to communicate with each fastening hole 32a2 of the fastening piece 32a.

[0027] The base plate 40 is configured to have higher rigidity (in other words, to be less likely to deform) than the portion of the opening and closing device 1 having the fastening surface 32a1 (the fastening piece 32a in the illustrated example). According to the illustrated example, the base plate 40 is formed into a plate shape from a hard metal material, and its thickness is made greater than the thickness of the fastening piece 32a of the pivot support bracket 32, thereby making it more rigid than the fastening piece 32a. Alternatively, the base plate 40 may be made of a material having higher rigidity than the support bracket 32 ​​.

[0028] 2(b), the base plate 40 having the above configuration is sandwiched between the surface of the fire-resistant covering material x2 of the wooden skeleton X and the fastening surface 32a1 of the fastening piece 32a so that the four sides are exposed around the fastening piece 32a. In other words, the four edges (four sides) of the base plate 40 protrude outward from between the surface of the fire-resistant covering material x2 and the fastening surface 32a1. The fastening pieces 32a and the base plate 40 are fastened to the wooden frame X by a plurality of fasteners 37 (screws in the example of FIG. 3).

[0029] The procedure for fastening each pivot bracket 32 ​​having the above-described configuration to the wooden body X via the base plate 40 will be explained in more detail as follows: the base plate 40 is placed on the surface of the fire-resistant covering material x2 of the wooden body X, and then the fastening surface 32a1 of the fastening piece 32a of the pivot bracket 32 ​​is placed on the surface of this base plate 40 (see Figures 2 and 3). Then, a plurality of fasteners 37 are inserted through the stacked base plate 40 and fastening pieces 32a. The head of each fastener 37 is engaged with the surface of the fastening piece 32a, and the screw portion is inserted through the fastening piece 32a and base plate 40, and screwed into the fire-resistant covering material x2 and the hanging wooden piece x1 of the wooden skeleton X.

[0030] Therefore, according to the opening and closing device installation structure A having the above configuration, the base plate 40, which has an area larger than the fastening surface 32a1, can mitigate localized strong pressure on the surface of the fire-resistant covering material x2 that constitutes the wooden skeleton X. As a result, it is possible to prevent damage to the surface of the fire-resistant covering material x2 and a decrease in the fastening strength of the pivot support bracket 32.

[0031] <Second embodiment> Next, another example of the switchgear installation structure according to the present invention will be described. The opening and closing device installation structure B described below is a modified version of the opening and closing device installation structure A, so the modified parts will be mainly described in detail, and similar parts will be given the same symbols, and duplicate explanations will be omitted.

[0032] In the switchgear installation structure B shown in Figs. 4 and 5, the base plate 40 in the switchgear installation structure A is replaced with a base plate 40B, and the pivot bracket 32 ​​is previously joined integrally to this base plate 40B.

[0033] The base plate 40B has the fastening piece 32a of the pivot bracket 32 ​​integrally joined to its center side, and has multiple through-holes 42 around this fastening piece 32a (on the square side in the illustrated example) through which the fastening device 37 is inserted. The fastening piece 32a may be joined to the base plate 40B by welding, but other joining means such as screwing, riveting, fitting, or an appropriate combination of these may also be used.

[0034] The base plate 40B, which has the support bracket 32 ​​integrally formed therewith, is placed on the fire-resistant covering material x2 of the wooden frame X, as shown in FIG. 5, and is fastened to the wooden frame X by fasteners 37 inserted into the fastening holes 42.

[0035] Therefore, according to the opening / closing device installation structure B shown in Figures 4 and 5, similarly to the opening / closing device installation structure A, the base plate 40B can alleviate the strong local pressure on the surface of the fire-resistant covering material x2, and furthermore, the base plate 40B and the support bracket 32 ​​can be firmly joined.

[0036] <Third embodiment> A switchgear installation structure C shown in FIG. 6 is obtained by replacing the base plate 40B in the switchgear installation structure B with a base plate 40C.

[0037] The base plate 40C is the same as the base plate 40B, except that the lower end portion thereof that comes into contact with the surface of the fire-resistant covering material x2 is chamfered over the entire length in the width direction. That is, the base plate 40C integrally includes a rectangular flat plate portion 40C1 and a curved portion 40C2 protruding from the lower end side of the flat plate portion 40C1.

[0038] The flat plate portion 40C1 has the fastening piece 32a of the pivot bracket 32 ​​integrally joined to the center thereof in substantially the same manner as the base plate 40B. The curved portion 40C2 has a shape in which the convex curved vertical cross section (see FIG. 7(a)) is continuous in the width direction.

[0039] Therefore, according to the opening and closing device installation structure C shown in Figure 6, in addition to obtaining substantially the same effects as the above-mentioned embodiment, it is possible to prevent damage to the fire-resistant covering material x2, particularly at the position corresponding to the lower end of the base plate 40C. That is, the load due to the weight of the switchgear 1 tends to concentrate on the lower end side of the base plate 40C. Therefore, the fire-resistant covering material x2 is pressed particularly strongly at a position corresponding to the lower end of the base plate 40C. However, according to the switchgear installation structure C, the curved portion 40C2 can reduce the local pressing force applied from the lower end of the base plate 40C to the fire-resistant covering material x2, thereby effectively preventing damage to the fire-resistant covering material x2.

[0040] Alternatively, the chamfered portion on the lower end of the base plate 40C may be as shown in FIGS. 7(b) and 7(c). The base, the main part of which is shown in FIG. 7(b), is a flat base having substantially the same shape as the base plate 40B, with the lower corners that come into contact with the fire-resistant covering material x2 being rounded and chamfered. The base, the main part of which is shown in FIG. 7(c), is a flat base having substantially the same shape as the base plate 40B, with the lower corners that come into contact with the fire-resistant covering material x2 formed in a C-chamfered shape.

[0041] <Fourth embodiment> A switchgear installation structure D shown in FIG. 8 is obtained by replacing the base plate 40B in the switchgear installation structure B with a base plate 40D.

[0042] The base plate 40D is formed in a generally polygonal shape having four or more sides in plan view (in the illustrated example, a quadrilateral shape having four sides), and an intersection 40D1 of adjacent sides is formed in a convex curve in plan view.

[0043] Therefore, according to the switchgear installation structure D shown in FIG. 8, it is possible to effectively prevent the fire-resistant covering material x2 from being damaged, particularly in the portions corresponding to the square sides of the base plate 40D. That is, the square corners of the base plate may locally pressurize the fire-resistant covering material x2 due to vertical and horizontal shaking caused by an earthquake, etc. The base plate 40D having the above-described configuration can reduce such localized pressing forces on the corners.

[0044] <Fifth embodiment> A switchgear installation structure E shown in FIG. 9 is obtained by replacing the base plate 40B in the switchgear installation structure B with a base plate 40E.

[0045] The base plate 40E is formed in a shape in plan view having an upper side and a lower side that is substantially parallel to the upper side, and the length W2' of the lower side is set longer than the length W2 of the upper side.

[0046] The base plate 40E is fastened to the surface of the fire-resistant covering material x2 at two points spaced apart substantially horizontally near the upper end and two points spaced apart substantially horizontally near the lower end. The fastening pitch W1' at the two points near the lower end is larger than the fastening pitch W1 at the two points near the upper end.

[0047] That is, the base plate 40E has fastening holes 42 at two locations spaced approximately horizontally near the upper side with a pitch W1, and fastening holes 42' at two locations spaced approximately horizontally near the lower side with a pitch W1'. The base plate 40E is fixed to the fire-resistant covering material x2 of the wooden skeleton X by fasteners 37 which are inserted into the fastening holes 42, 42, 42', 42', respectively.

[0048] Therefore, according to the switchgear installation structure E shown in FIG. 9, the pressing force per unit area applied from the base plate 40E to the fire-resistant covering material x2 can be made smaller toward the lower side. Furthermore, it is possible to effectively reduce the risk that the load due to the weight of the switchgear 1 will be concentrated on the lower side of the base plate 40 and that this load will damage the fire-resistant covering material x2.

[0049] Sixth Embodiment A switchgear installation structure F shown in FIGS. 10 and 11 is obtained by replacing the base plate 40 in the switchgear installation structure A with a base plate 40F.

[0050] The base plate 40F is formed in a generally flat plate shape spanning the two support brackets 32, 32 and made of a material that is impermeable to gas (a plate material made of hard metal in the illustrated example). The base plate 40F has an area larger than the rear surface of the storage section 30 (the surface facing the fire-resistant covering material x2). When the opening and closing device 1 is attached to the wooden skeleton X via the base plate 40F, the upper end of the base plate 40F protrudes upward from the storage section 30, and the lower end of the base plate 40F protrudes downward from the storage section 30 (see FIG. 10). The left end of the base plate 40F protrudes leftward from the storage section 30, and the right end of the base plate 40F protrudes rightward from the storage section 30. That is, the outer periphery of the base plate 40F protrudes outward from the storage section 30 along the surface of the fire-resistant covering material x2. With these configurations, the base plate 40F functions as a partition material that prevents gas from passing between the wooden skeleton X and the switchgear 1.

[0051] 10 and 11, the base plate 40F can effectively prevent the portion of the fire-resistant covering material x2 that corresponds to the back surface of the switchgear 1 from being damaged. Furthermore, when flammable gas is generated from the wooden structure X due to the heat of a fire, the base plate 40F can prevent the flammable gas from entering the switchgear 1 or passing through the lintel member 35 inside the switchgear 1 and igniting.

[0052] That is, it is known that the general combustion mechanism of wood is that heat generates flammable gas from the wood, and this flammable gas combines with surrounding oxygen to generate a flame. In a conventional switchgear installation structure, as illustrated in Fig. 12, flammable gas generated in the wooden skeleton X due to the heat of a fire may flow into the switchgear 100 and cause the fire to spread. However, according to the switchgear installation structure F having the above-described configuration, the flow of the above-described flammable gas can be blocked by the base plate 40F, and the above-described spread of fire can be prevented.

[0053] <Other variations> According to the above embodiment, the base plate 40, 40B, 40C, 40D, 40E or 40F is provided between the fire-resistant covering material x2 and the storage section 30, but as another example, the base may be provided between the fire-resistant covering material x2 and a switching device component other than those described above. For example, if the pedestal is provided between the fire-resistant covering material x2 and the guide rail 20, the pedestal can prevent the fire-resistant covering material x2 on the back side of the guide rail 20 from being damaged.

[0054] According to the above-mentioned opening / closing device installation structure E (see Figure 9), the length and fastening pitch of the lower side are made larger than the length and fastening pitch of the upper side, but as other examples, it is also possible to make the lengths of the upper and lower sides approximately the same and make the fastening pitch of the lower side larger than the fastening pitch of the upper side, or to make the length of the lower side larger than the length of the upper side and make the fastening pitch of the upper side and the fastening pitch of the lower side approximately the same.

[0055] According to the above embodiment, as a particularly preferred aspect, the above-mentioned base is formed from a hard metal plate material, but this base can also be made from a hard plate material other than metal (for example, a ceramic plate material or a plate material made of non-flammable hard resin), etc. In addition, in an embodiment specialized for preventing fire spread, such as the opening and closing device installation structure F, a base having approximately the same shape as the base plate 40F can be formed from a soft material that is impermeable to gases, thereby achieving the fire spread prevention effect.

[0056] In the above embodiment, the curved portion 40C2 and the convexly curved intersection portion 40D1 can be applied to base plates other than the base plates 40C and 40D. For example, the base plate 40, the base plate 40E, or the base plate 40F may have a curved portion 40C2 or the intersecting portion of adjacent pieces may be formed in a convex curve.

[0057] Furthermore, the present invention is not limited to the specific configurations described above, and can be modified as appropriate within the scope of the present invention.

[0058] <Summary> As described above, the above embodiments disclose the following inventions. (1) This is an opening / closing device installation structure in which an opening / closing device is fastened to a wooden frame whose surface is formed of a fire-resistant covering material, and the opening / closing device installation structure is characterized in that a base plate having an area larger than the fastening surface is sandwiched between the surface of the fire-resistant covering material and the fastening surface of the opening / closing device (see Figures 1 to 11). (2) The opening and closing device installation structure described in (1) (Figs. 2, 4, 6, 8, 9, and 11) is characterized in that the edge of the base plate protrudes outward from between the surface of the fire-resistant covering material and the fastening surface of the opening and closing device. (3) The switchgear installation structure according to (1) or (2), wherein the base plate has higher rigidity than a portion of the switchgear having the fastening surface. (4) The opening and closing device installation structure described in any one of (1) to (3) is characterized in that the lower end of the base plate that contacts the surface of the fire-resistant covering material is formed in a chamfered shape (see Figures 6 to 7). (5) The opening and closing device installation structure described in any one of (1) to (4) (see Figure 8) is characterized in that the base plate is formed in a roughly polygonal shape in a plan view having four or more sides, and the intersections of adjacent sides are formed in a convex curve. (6) The opening and closing device installation structure described in any one of (1) to (5) (see Figure 9) is characterized in that the base plate is formed in a planar view shape having an upper side and a lower side approximately parallel to the upper side, and the lower side is formed longer than the upper side. (7) The opening and closing device installation structure described in any one of (1) to (6) (see Figure 9) is characterized in that the base plate is fastened to the surface of the fire-resistant covering material at two points near the upper end and two points near the lower end, each of which are spaced approximately horizontally apart, and the fastening pitch of the two points near the lower end is larger than the fastening pitch of the two points near the upper end. (8) An opening / closing device installation structure according to any one of (1) to (7) (see Figures 2 to 11), characterized in that the opening / closing device is provided with a support bracket that supports the end side of the winding shaft, and the fastening surface is provided on the support bracket. (9) The opening and closing device installation structure described in (8) is characterized in that two of the support brackets are provided corresponding to both ends of the winding shaft, and the base plate is provided across the two support brackets (see Figures 10 and 11). (10) The opening and closing device installation structure described in (9) is characterized in that the base plate is made of a material that is impermeable to gas and separates the wooden body from the opening and closing device (see Figures 10 and 11).

[0059] The above embodiment also discloses an invention in which only the following constituent elements are essential. That is, one aspect of the present invention is an opening and closing device installation structure described in (8) (see Figures 10 and 11), characterized in that in an opening and closing device installation structure in which an opening and closing device is fastened to the surface of a wooden body, a partition material is sandwiched between the surface of the wooden body and the opening and closing device, and the partition material is made of a material that is impermeable to gas and separates the wooden body from the opening and closing device. According to this invention, even if flammable gas is generated from the wooden structure due to the heat of a fire, the partition material can prevent this flammable gas from flowing into the opening and closing device and igniting. [Explanation of symbols]

[0060] 1: Switchgear 10: Opening and closing body 20: Guide rail 30: Storage area 32: Axial support bracket 32a1: Adhering surface 32a: Fastening piece 32b: Support piece 40,40B,40C,40D,40E,40F: Base plate X: Wooden frame x1: hanging wood x2: Fire-resistant coating material

Claims

1. In a switchgear installation structure in which a switchgear is fastened to a wooden frame whose surface is formed with a fire-resistant covering material, A switchgear installation structure characterized in that a base plate having an area larger than the fastening surface is sandwiched between the surface of the fire-resistant covering material and the fastening surface of the switchgear.

2. 2. The switchgear installation structure according to claim 1, wherein an edge of the base plate protrudes outward from between the surface of the fire-resistant covering material and the fastening surface of the switchgear.

3. 2. The switchgear installation structure according to claim 1, wherein the base plate has a higher rigidity than a portion of the switchgear having the fastening surface.

4. 2. The switchgear installation structure according to claim 1, wherein the base plate has a lower end that is in contact with the surface of the fire-resistant covering material and is formed in a chamfered shape.

5. 2. The switchgear installation structure according to claim 1, wherein the base plate is formed in a generally polygonal shape having four or more sides in a plan view, and the intersections of adjacent sides are formed in a convex curve.

6. 2. The switchgear installation structure according to claim 1, wherein the base plate is formed in a shape in a plan view having an upper side and a lower side substantially parallel to the upper side, and the lower side is formed longer than the upper side.

7. The upper and lower ends of the base plate are fastened to the surface of the fire-resistant covering material at two locations spaced apart approximately horizontally, 2. The opening / closing device installation structure according to claim 1, wherein the fastening pitch at the two locations closer to the lower end is greater than the fastening pitch at the two locations closer to the upper end.

8. the opening and closing device includes a support bracket for supporting an end side of the winding shaft, 8. The opening / closing device installation structure according to claim 1, wherein the fastening surface is provided on the pivot support bracket.

9. Two of the support brackets are provided corresponding to both ends of the winding shaft, 9. The opening / closing device installation structure according to claim 8, wherein the base plate is provided across the two pivot support brackets.

10. 10. The switchgear installation structure according to claim 9, wherein the base plate is made of a gas-impermeable material and separates the wooden frame from the switchgear.

Images