JP7222807B2 - Bus duct installation method and bus duct structure configuration method - Google Patents

Description

The present invention relates to a bus duct installation method and a bus duct structure construction method.

Bus ducts are sometimes used in vertical power main lines provided in buildings such as high-rise buildings. When laying a bus duct, generally, a nylon sling is wrapped around the bus duct, or a special hanging tool (Non-Patent Document 1) is attached to the tip of the bus duct, a wire is attached to this nylon sling or hanging tool, and it is attached to the ceiling of each floor. It is known to lift by means of chain blocks attached to The bus ducts, which are lifted one by one, are connected to each other and fixed to the floor surface of each floor with fixing metal fittings and spring hangers.

Moreover, in Patent Documents 1 and 2, the end of a long bus duct (for example, 50 m long) in which rigid parts and flexible parts are alternately provided is towed and lifted vertically, and a fixed part is attached to the rigid part of the bus duct. A method of fixing and laying it on each floor while sequentially lowering it is disclosed.

JP-A-60-105768 JP-A-59-156106

Furukawa Electric Co., Ltd., "Hanging jig catalog for bus duct construction", Oct. 11, 2012, No. M2-12035

A plurality of bus ducts for high-rise buildings are usually installed on each floor. Therefore, for example, when laying two bus ducts, if the bus ducts are lifted one by one and connected, the connection of the bus ducts on each floor is performed at two locations, near the floor surface and near the ceiling. In this case, the work of connecting near the ceiling is a high-place work, and therefore a stepladder and, in some cases, a safety belt must be prepared, which may reduce work efficiency. In addition, since the space in which bus ducts are laid is generally narrow, it is necessary to bring a stepladder into the narrow work area and remove it during connection work, which may further reduce work efficiency.

The methods described in Patent Documents 1 and 2 do not require the work of connecting bus ducts, but the taller the building, the longer the total length and the heavier the total weight, so the handling efficiency is reduced and the work efficiency is reduced. As it decreases, the mechanical durability of the flexible portion and the complexity of the structure can become a problem.

In addition, when using a hanger attached to the tip of the bus duct as in Non-Patent Document 1, the connection part provided at the tip of the bus duct and the hanger interfere with each other. There is a problem that the work for connecting cannot be performed at the connecting portion, and the working efficiency is low.

The present invention has been made in view of the above, and its object is to provide a bus duct laying method and a bus duct structure constructing method that enable bus ducts to be laid efficiently regardless of the height of the building. That's what it is.

In order to solve the above-described problems and achieve the object, a bus duct laying method according to one aspect of the present invention is a method for laying bus ducts in a building having a plurality of floors, wherein a plurality of bus ducts are installed in a side part. A lifting step in which flexible tensile strength members are bridged and connected to each other and lifted vertically; a temporary placement step of temporarily placing the bus duct at a height in the vicinity of , a connection step of connecting the upper end connection portion of the temporarily placed bus duct and the lower end connection portion of the upper bus duct immediately above the temporarily placed bus duct; After the connecting step, a fixing step of suspending the connected bus duct and fixing it to the predetermined floor is included.

A bus duct installation method according to an aspect of the present invention is characterized in that, in the fixing step, the upper bus duct is fixed to the predetermined floor so that the upper end of the upper bus duct is at a height near the predetermined floor. .

A bus duct laying method according to an aspect of the present invention includes, when an existing bus duct is fixed to a floor on a lower floor than the predetermined floor, before or after fixing the upper bus duct to the predetermined floor, The present invention further includes an existing bus duct connecting step of connecting a lower end connecting portion of the lower bus duct and an upper end connecting portion of the existing bus duct.

A bus duct laying method according to an aspect of the present invention is characterized by including a step of attaching a hanging jig for hanging the tensile strength member to side portions of the plurality of bus ducts.

In the bus duct laying method according to an aspect of the present invention, the position where the tensile strength member is bridged over the bus duct is a position within a range of 20% to 40% of the total length of the bus duct from the upper end or the lower end of the bus duct. It is characterized by

A bus duct laying method according to an aspect of the present invention includes the step of attaching a temporary placement jig to a side portion of the temporarily placed bus duct, wherein the temporary placement jig is attached to the side portion of the temporarily placed bus duct. It is characterized by having a side portion and a bottom portion directly or indirectly in contact with the predetermined floor.

A bus duct installation method according to an aspect of the present invention is characterized in that the temporary placement jig has an overturn prevention portion extending in a direction intersecting with an extending direction of the bottom portion.

A bus duct laying method according to an aspect of the present invention is characterized in that the upper end of the lower bus duct in the temporary placement step has a height of 1.5 m or less from the predetermined floor.

A method for constructing a bus duct structure according to an aspect of the present invention is characterized by assembling the bus duct structure using the laying method.

According to the present invention, there is an effect that the bus duct can be installed efficiently and the bus duct structure can be constructed regardless of the high-rise level of the building.

FIG. 1 is a schematic diagram showing a schematic configuration of a bus duct. FIG. 2 is a schematic diagram showing a schematic configuration of the hanging jig. FIG. 3 is an explanatory diagram of a method of laying bus ducts. FIG. 4 is an explanatory diagram of a method of laying bus ducts. FIG. 5 is an explanatory diagram of a method of laying bus ducts. FIG. 6 is a schematic diagram showing a schematic configuration of the main body of the temporary placement jig. FIG. 7 is a schematic diagram showing a schematic configuration of a temporary placement jig overturn prevention unit. FIG. 8 is an explanatory diagram of a method of laying bus ducts. FIG. 9 is a schematic diagram showing a schematic configuration of a bus duct having plug-in holes.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment described below. In addition, in the description of the drawings, the same or corresponding elements are given the same reference numerals as appropriate. Also, it should be noted that the drawings are schematic, and the relation of dimensions of each element, the ratio of each element, etc. may differ from reality. Furthermore, even between the drawings, there are cases where portions having different dimensional relationships and ratios are included.

(Configuration of bus duct and hanging jig)
FIG. 1 is a schematic diagram showing a schematic configuration of a bus duct used in a laying method according to an embodiment. FIG. 1(a) is a view of the bus duct 10 viewed from the width direction, FIG. 1(b) is a view of the bus duct 10 viewed from the thickness direction, and FIG. - X-ray cross-sectional view. The bus duct 10 includes frames 11a and 11b, insulated conductors 12a, 12b and 12c, connection cases 13a, 13b, 13c and 13d, terminals 14a, 14b, 14c, 14d, 14e and 14f, and insulating spacers 15a and 15b. , 15c, 15d, 15e, 15f, leaf springs 16a, 16b, and fixing members 17a, 17b, 17c, 17d, 17e, 17f, 17g, 17h, 17i, 17j. The fixing members 17a to 17j are all fixing members composed of bolts and nuts.

The frames 11a and 11b extend in the longitudinal direction, are made of, for example, aluminum or steel, and are formed, for example, by extrusion molding or by bending a plate material. The frames 11a and 11b are fastened by fixing members 17c to 17j. Each of the insulated conductors 12a to 12c has a structure in which the surface of a plate-shaped conductor is covered with an insulating material. The conductor is made of aluminum, for example, and the insulating material is made of heat-resistant polyvinyl chloride (PVC) or heat-resistant polyester (PET) film, for example. The insulated conductors 12a to 12c are stacked and housed in a housing space formed between the fastened frames 11a and 11b.

The connection cases 13a and 13b are plate-like members, and are attached to the upper ends of the frames 11a and 11b in the longitudinal direction so as to face each other. The connection cases 13a and 13b are fixed to the side surfaces of the frames 11a and 11b by fixing members 17c and 17d. Fixing members 17a and 17b for connecting the bus duct 10 to other bus ducts are attached to the connection cases 13a and 13b via leaf springs 16a and 16b. The connection cases 13c and 13d are plate-like members, and are attached to the lower ends of the frames 11a and 11b in the longitudinal direction so as to face each other. The connection cases 13c and 13d are fixed to the side surfaces of the frames 11a and 11b by fixing members 17i and 17j.

Terminals 14a-14f are made of a conductor such as aluminum. Terminals 14a, 14b, and 14c are formed at upper ends of insulated conductors 12a, 12b, and 12c in the longitudinal direction, respectively, and are housed between connection cases 13a and 13b. The terminals 14d, 14e, and 14f are formed at the lower ends in the longitudinal direction of the insulated conductors 12a, 12b, and 12c, respectively, and are housed between the connection case 13c and the connection case 13d.

The insulating spacer 15a is attached to the terminal 14a, and is a member for insulating the terminal 14a from other bus duct terminals and connection cases when connected to another bus duct. The insulating spacer 15b is attached to the terminal 14b, and insulates the terminal 14b from the terminal 14c, and when connected to another bus duct, insulates the terminal 14b from the terminal of the other bus duct or the connection case. It is a member for The insulating spacer 15c is attached to the terminal 14c and insulates the terminal 14c from the terminal 14b, and when connected to another bus duct, insulates the terminal 14c from the terminal of the other bus duct or the connection case. It is a member for

The insulating spacer 15d is attached to the terminal 14d, and insulates the terminal 14d from the terminal 14e, and when connected to another bus duct, insulates the terminal 14d from the terminal of the other bus duct or the connection case. It is a member for The insulating spacer 15e is attached to the terminal 14e, and insulates the terminal 14e from the terminal 14d, and when connected to another bus duct, insulates the terminal 14e from the terminal of the other bus duct or the connection case. It is a member for The insulating spacer 15f is attached to the terminal 14f, and is a member for insulating the terminal 14f from other bus duct terminals and connection cases when connected to another bus duct. The insulating spacers 15a to 15f are all made of an insulating material or coated with an insulating material.

Connection cases 13a and 13b, terminals 14a to 14c, insulating spacers 15a to 15c, leaf springs 16a and 16b, and fixing members 17a and 17b constitute an upper end connection portion 10a of bus duct 10. As shown in FIG. The connection cases 13c, 13d, the terminals 14d to 14f, and the insulating spacers 15d to 15f constitute the lower end connection portion 10b of the bus duct 10. As shown in FIG.

As shown in FIG. 1(a), screw holes 18a and 18b are formed on the upper end sides of the side surfaces of the frames 11a and 11b when viewed in the width direction so as to be aligned in the thickness direction. Screw holes 18c and 18d are formed so as to line up in the thickness direction on the lower end sides of the side surfaces of the frames 11a and 11b as viewed in the width direction. Although not shown, screw holes are also formed at positions facing the screw holes 18a to 18d in the width direction of the frames 11a and 11b. These screw holes are constituted by blind rivets attached to the frames 11a, 11b, for example.

Next, a hanging jig for hanging the bus duct 10 will be described. FIG. 2 is a schematic diagram showing a schematic configuration of the hanging jig. 2(a) is a view of the lifting jig 20 viewed from the thickness direction, FIG. 2(b) is a view of the lifting jig 20 viewed from the width direction, and FIG. 2(c) is a drawing of the lifting jig It is the figure which looked at 20 from the longitudinal direction. The lifting jig 20 is made of steel, for example, and includes a body portion 21 , a base portion 22 , hanging member mounting portions 23 and 24 , and protrusions 25 and 26 .

The body portion 21 is a plate-like member, and bent portions 21a and 21b are formed along the longitudinal direction at both ends in the width direction. The distance between the bent portion 21a and the bent portion 21b is slightly larger than the total thickness of the frames 11a and 11b. Further, through holes 21c and 21d are formed in the main body 21 so as to be aligned in the width direction. The base portion 22 is a plate-like member and is fixed to the main body portion 21 . The suspension member mounting portions 23 and 24 are plate-shaped members and stand on the base portion 22 so as to face each other in the width direction. A through hole 23 a is formed in the hanging member mounting portion 23 . A through hole (not shown) is also formed in the suspension member mounting portion 24 so as to face the through hole 23a.

The projecting portions 25 and 26 are erected on the body portion 21 so as to be aligned in the width direction. The protruding portions 25 and 26 have a substantially cylindrical shape on the base end side and a substantially disc shape with a larger diameter on the tip end side than on the base end side.

(Laying method)
Next, a laying method according to an embodiment will be described with reference to FIGS. The object of laying is, for example, a high-rise building having a height of 20 m or more having multiple floors, and the figure shows floors F1, F2, and F3 of the 2nd, 3rd, and 4th floors of the multiple floors. Holes H1, H2 and H3 for vertically laying the bus duct 10 are formed in the floors F1, F2 and F3, respectively. It is assumed that the bus duct 10 has already been fixed to the hole H1 of the floor F1 by a spring hanger or a vertical fixing metal fitting 41 and laid. It is also assumed that the distance between floors (floor height) is 4.6 m and the length of the bus duct 10 is 2.3 m.

First, as shown in FIG. 3(a), a plurality of bus ducts 10 are transported by a trolley T to the location where the bus ducts are to be laid on the second floor. Subsequently, four hanging jigs 20 are attached to each bus duct 10 and fixed. The hanging jig 20 may be attached before transportation. Subsequently, using a chain block or a winch, a wire W, which is a flexible tensile strength member, is suspended from the upper floors of the fourth floor or higher through the holes H3 and H2 and attached to the first bus duct 10 .

As shown in FIG. 3(b), a lifting jig 20 is attached to each of the width direction side portions on the upper end side of the first bus duct 10. As shown in FIG. Each suspension jig 20 abuts on the bus duct 10, and aligns the through holes 21c and 21d of the suspension jig 20 with the screw holes (screw holes 18a and 18b or screw holes not shown) of the bus duct 10, respectively. , are fixed by screwing in the bolts 32,33. If the distance between the bent portions 21a and 21b of the lifting jig 20 is slightly larger than the thickness of the frames 11a and 11b, the bent portions 21a and 21b can lift the frames 11a and 11b in the thickness direction. The jig 20 can be positioned. Note that the terminals 14a to 14c and the insulating spacers 15a to 15c are omitted in FIG. 3(b).

A steel annular suspension member 31 such as a shackle is attached to the through holes 23 a and 24 a of the suspension member attachment portions 23 and 24 of each suspension jig 20 . Two wires W1, which are flexible tensile strength members, are attached to the ends of the wires W, and are respectively hung on the annular suspension members 31 of the suspension jigs 20 on the upper end side of the bus duct 10. . Similarly, a hanging jig 20 is attached to each of the width direction side portions on the lower end side of the first bus duct 10 . An annular suspension member 31 is attached to the through holes 23 a and 24 a of the suspension member attachment portions 23 and 24 of each suspension jig 20 .

Since the bus duct 10 is lifted by the wires W1 attached to the two lifting jigs 20 attached to the lateral side portions, the upper end connecting portion 10a does not interfere with the wires W1. In addition, the bus duct 10 is prevented from rotating about its longitudinal direction during lifting.

Subsequently, as shown in FIG. 3(c), the first bus duct 10 is lifted by the wire W while being supported by the worker. Then, the lifting is temporarily stopped in the middle of lifting, and two wires W2, which are flexible tensile members, are bridged and connected between the first bus duct 10 and the second bus duct 10.例文帳に追加At this time, each wire W2 is connected to each of the annular suspension members 31 of the two suspension jigs 20 on the lower end side of the first bus duct 10 and the two suspension jigs 20 of the two suspension jigs 20 on the upper end side of the second bus duct 10. It is bridged between the annular suspension member 31 and . As for the second bus duct 10, the lifting jig 20 may be attached to each of the widthwise side surfaces on the upper end side, and may not be attached to the widthwise side surfaces on the lower end side.

Subsequently, as shown in FIG. 3(d), the worker lifts up the two bus ducts 10 connected by each wire W2 while supporting the second bus duct 10. Then, as shown in FIG. As described above, the floor height is 4.6 m, and the length of the bus duct 10 is 2.3 m. It can be vertically lifted through the holes H1 and H2 without being caught by F2.

If the position at which the wires W1 and W2 are bridged over the bus duct 10 (the position of the annular suspension member 31 in this embodiment) is close to the upper end or lower end of the bus duct 10, the load on the operator when supporting the bus duct 10 is high. Become. Also, if it is close to the center of the bus duct 10, the bus duct 10 may rotate. Therefore, it is preferable that the wires W1 and W2 are laid over the bus duct 10 at a position within a range of 20% to 40% of the overall length of the bus duct 10 from the upper or lower end of the bus duct 10.

In FIG. 4A, the upper end of the first bus duct 10 (hereinafter sometimes referred to as the upper bus duct or bus duct 10A) is at a height above the fourth floor floor F3, and the second bus duct 10 (hereinafter , lower bus duct, or bus duct 10B) is vertically lifted until the lower end thereof reaches the height above the floor F2 of the third floor. The bus duct 10C is already installed in the hole H1. FIG. 4(b) is an enlarged view of area A in FIG. 4(a). As shown in FIG. 4(b), the bus duct 10A and the bus duct 10B are configured by the annular suspension members 31 of the two suspension jigs 20 on the lower end side of the bus duct 10A and the two suspension jigs on the upper end side of the bus duct 10B. 20 are connected by a wire W2 that is stretched between them. In this manner, the bus duct 10A and the bus duct 10B are connected by connecting the wires W2 between the width direction side surfaces. Note that the terminals 14a to 14f and the insulating spacers 15a to 15f are omitted in FIG. 4(b).

Since the bus duct 10A and the bus duct 10B are connected by each wire W2 attached to the two hanging jigs 20 attached to the lateral side portions, the lower end connecting portion 10b of the bus duct 10A and the upper end connecting portion 10a of the bus duct 10B are connected. and each wire W2. Also, the bus ducts 10A and 10B are prevented from rotating about the longitudinal direction during lifting.

Subsequently, a temporary placement process is performed. In the temporary placement step, after temporarily suspending the connected bus ducts 10A and 10B, the lower bus duct 10B is placed on the floor F2 so that the upper end of the lower bus duct 10B is at a height near the floor F2 in this case. This is the step of temporary placement.

FIG. 5(a) shows the state after the temporary placement step, and FIG. 5(b) is an enlarged view of region B in FIG. 5(a). Temporary placement is performed using two temporary placement jigs 50 . The temporary placement jig 50 includes a body portion 51 and an overturn prevention portion 52 .

6A, 6B, and 6C are a plan view, a front view, and a right side view, respectively. The main body portion 51 includes a plate-like bottom surface portion 51a and a side surface portion 51b that are substantially orthogonal to each other so as to form a substantially L shape in a front view, and a plate that is provided so as to be substantially orthogonal to both the bottom surface portion 51a and the side surface portion 51b. shaped reinforcing portion 51c. Further, eight screw holes 51aa arranged in two rows are formed in the bottom portion 51a. Two paddle holes 51ba are formed in the side portion 51b. The body portion 51 is formed, for example, by punching, bending, or welding a plate-like steel material.

7A and 7B are schematic diagrams showing a schematic configuration of the overturn prevention portion 52, and FIGS. 7A and 7B are a front view and a left side view, respectively. The overturn prevention portion 52 has a substantially L-shape when viewed from the side, and two counterbore holes 52a are formed on one surface. The overturn prevention portion 52 is formed, for example, by punching or bending a plate-like steel material.

The temporary placement jig 50 is constructed by inserting screws into counterbore holes 52a of the overturn prevention portion 52 and screwing each screw into any two screw holes 51aa formed in the bottom surface portion 51a of the body portion 51. be done. The head of the screw is accommodated in the counterbore portion of the counterbore hole 52a. At this time, the direction in which the bottom portion 51a extends (horizontal direction in FIG. 6(a)) and the direction in which the overturn prevention portion 52 extends (horizontal direction in FIG. 7(a)) intersect. cross to do.

Returning to FIG. 5, description will be made. In this example, a base channel 61 is attached to the floor F2 so as to surround the perimeter of the hole H2. Therefore, the bus duct 10B is placed on the floor F2 via the base channel 61 by the temporary placement jig 50. As shown in FIG.

Specifically, first, the protruding portions 25 and 26 of the lifting jigs 20 on the upper end side of the bus duct 10B are inserted into the paddle holes 51ba of the side portions 51b of the temporary placement jigs 50. As shown in FIG. As a result, the temporary placement jig 50 is attached to each of the lateral side portions of the bus duct 10B. After that, the bus ducts 10A and 10B are hung down to predetermined positions. As a result, the bus duct 10B is placed on the floor F2 while being supported by the bottom surface portion 51a of each temporary placement jig 50 coming into contact with the floor F2 via the overturn prevention portion 52 and the base channel 61. FIG.

Here, the bottom surface portion 51a of each temporary placement jig 50 extends away from the bus duct 10B in the width direction of the bus duct 10B, and can stably support the bus duct 10B. Moreover, since each overturn prevention portion 52 extends in a direction perpendicular to each bottom surface portion 51a, the bus duct 10B is also prevented from overturning in its thickness direction.

Further, since a plurality of screw holes 51aa are formed in the bottom surface portion 51a of the body portion 51, the positional relationship between the overturn prevention portion 52 and the base channel 61 can be adjusted by selecting the screw holes 51aa to be used. The bus duct 10B can be temporarily placed more stably if the overturn prevention portion 52 contacts both the upper surface and the side surface of the base channel 61 .

In addition, when the base channel 61 is not attached, it is preferable that the overturn prevention part 52 abut on both the surface of the floor F2 and the side surface in the hole H2.

Subsequently, as shown in FIG. 8A, a connection step is performed to connect the upper end connection portion 10a of the temporarily placed bus duct 10B and the lower end connection portion 10b of the bus duct 10A immediately above the bus duct 10B. At this time, the bus duct 10B is temporarily placed on the floor F2 so that its upper end is at a height near the floor F2. Improve efficiency. The upper end of the bus duct 10B preferably has a height of 1.5 m or less from the floor F2, and more preferably 1 m or less.

The upper end connection portion 10a and the lower end connection portion 10b are connected by inserting the connection cases 13a to 13d, the terminals 14a to 14f, and the insulating spacers 15a to 15f into each other, and fixing the bolts of the fixing members 17a and 17b to the plate springs 16a and 16b. fixed with

Subsequently, as shown in FIG. 8(b), after the connecting step, the connected bus ducts 10A and 10B are suspended, and a fixing step of fixing the bus duct 10A is performed. Fixing to the floor F2 can be performed using spring hangers or vertical fixing metal fittings 42 . At this time, the bus duct 10A may be fixed to the floor F2 so that its upper end is at a height near the floor F2. As a result, even when another bus duct is newly connected on top of the bus duct 10A, it is not necessary to prepare, bring in, or remove a stepladder when performing the connection work, as in the process of connecting the bus duct 10B and the bus duct 10A. Therefore, work efficiency is further improved.

In this example, since the bus duct 10C as an existing bus duct is fixed to the floor F1 on the lower floor than the floor F2, before or after fixing the bus duct 10A to the floor F2, the lower end connecting portion of the bus duct 10B and the bus duct 10C and the upper end connection part of the .

After that, two bus ducts are newly transported to the third floor, and the lifting process, temporary placement process, connection process, fixing process, and the existing bus duct connection process using the bus duct 10A as the existing bus duct are repeated. It is possible to install bus ducts for the above high floors.

As described above, according to the laying method according to the present embodiment, bus ducts can be laid with high work efficiency. Furthermore, by repeating the lifting process, the temporary placement process, the connecting process, the fixing process, and the existing bus duct connecting process, the bus ducts can be installed with good work efficiency regardless of the height of the building. Moreover, by using the laying method according to the present embodiment, a bus duct structure assembled by connecting a plurality of bus ducts 10 can be constructed with good work efficiency regardless of the height of the building.

In the above-described embodiment, the bus duct 10C is installed as an existing bus duct.

In the above-described embodiment, the temporary placement jig 50 is provided with the overturn prevention portion 52, but it is not necessarily provided. If the anti-overturn portion 52 is not provided, the bottom surface portion 51a of the main body portion 51 will contact the floor F2 directly or indirectly via the base channel 61. As shown in FIG.

In the above-described embodiment, the hanging jig 20 is attached to the side surface of the bus duct 10 in the width direction. A hanging jig configured so that a body can be hung thereon may be used.

In the above-described embodiment, the temporary placement jig 50 is attached to the bus duct 10 by the projections 25 and 26 of the hanging jig 20. However, the bus duct itself may have projections formed of bolts or the like. If the temporary placement jig 50 is configured to be directly attached, it may be attached directly to the bus duct. Similarly, if the bus duct itself has a structure that allows the tensile strength member to be directly laid over the bus duct, the tensile strength member may be directly laid over the bus duct without using a lifting jig.

In the above-described embodiment, the two bus ducts 10 are connected by the wire W2, but three or more bus ducts 10 may be connected. When installing two bus ducts on each floor, it is preferable to connect an even number of bus ducts 10 .

Moreover, in the above embodiment, the bus duct 10 does not have a plug-in hole, but the laying method according to this embodiment can also be applied to the laying of a bus duct having a plug-in hole.

FIG. 9 is a schematic diagram showing a schematic configuration of a bus duct having plug-in holes. FIG. 9(a) is a view of the bus duct 10D viewed from the width direction, and FIG. 9(b) is a view of the bus duct 10D viewed from the thickness direction. This bus duct 10D has a configuration in which the connection cases 13a, 13b and terminals 14a, 14b, 14c of the bus duct 10 are replaced with connection cases 13Da, 13Db and terminals 14Da, 14Db, 14Dc, respectively. Since the connection cases 13Da and 13Db and the terminals 14Da to 14Dc form the plug-in hole portion PH, the bus duct 10D is highly expandable so that branch paths can be provided.

Moreover, the present invention is not limited by the above embodiments. The present invention also includes a configuration obtained by appropriately combining the constituent elements of the above-described embodiments. Further effects and modifications can be easily derived by those skilled in the art. Therefore, broader aspects of the present invention are not limited to the above-described embodiments, and various modifications are possible.

10, 10A, 10B, 10C, 10D Bus duct 10a Upper end connection 10b Lower end connection 11a, 11b Frames 12a, 12b, 12c Insulated conductors 13a, 13b, 13Da, 13Db Connection cases 13c, 13d Connection cases 14a, 14b, 14c, 14d , 14e, 14f, 14Da, 14Db, 14Dc Terminals 15a, 15b, 15c, 15d, 15e, 15f Insulating spacers 16a, 16b Leaf springs 17a, 17b, 17c, 17d, 17e, 17f, 17g, 17h, 17i, 17j Fixing member 18a, 18b, 18c, 18d Screw hole 20 Hanging jig 21 Body portion 21a, 21b, 22b Bent portion 21c, 21d Through hole 22 Base portion 23, 24 Hanging member mounting portion 23a, 24a Through hole 25, 26 Protruding portion 31 Ring Suspension members 32, 33 Bolts 41, 42 Spring hanger or vertical fixing bracket 50 Temporary placement jig 51 Body portion 51a Bottom portion 51aa Screw hole 51b Side portion 51ba Daruma hole 51c Reinforcement portion 52 Overturn prevention portion 52a Counterbored hole 61 Base channel A, B area F1, F2, F3 floor H1, H2, H3 hole PH plug-in hole part T carriage W, W1, W2 wire

Claims (9)

A method for laying bus ducts in a building having multiple floors, comprising:
A lifting step in which a plurality of bus ducts are vertically lifted by connecting the plurality of bus ducts by bridging a flexible tensile member between the side portions;
a temporary placement step of temporarily placing the lower bus duct on the lower side after suspending the plurality of connected bus ducts so that the upper end of the lower bus duct is at a predetermined height in the vicinity of the floor;
a connecting step of connecting the upper end connecting portion of the temporarily placed bus duct and the lower end connecting portion of the upper bus duct immediately above the temporarily placed bus duct;
After the connecting step, a fixing step of suspending the connected bus duct and fixing it to the predetermined floor;
A method of laying a bus duct, comprising: 2. The bus duct laying method according to claim 1, wherein in said fixing step, said upper bus duct is fixed to said predetermined floor so that the upper end of said upper bus duct is at a height near said predetermined floor. When the existing bus duct is fixed to a floor on a lower floor than the predetermined floor, before or after fixing the upper bus duct to the predetermined floor, the lower end connection part of the lower bus duct and the existing bus duct 3. The bus duct laying method according to claim 1, further comprising an existing bus duct connecting step of connecting the upper end connecting portion. 4. The method of laying bus ducts according to claim 1, further comprising the step of attaching hanging jigs for hanging said tensile members on side portions of said plurality of bus ducts. 5. The position where the tensile strength member is bridged over the bus duct is a position within a range of 20% to 40% of the total length of the bus duct from the upper end or the lower end of the bus duct. 1. The installation method of the bus duct according to one. A step of attaching a temporary placement jig to a side portion of the temporarily placed bus duct, wherein the temporary placement jig is directly or indirectly attached to the side portion attached to the side portion of the temporarily placed bus duct and the predetermined floor. 6. The method of laying a bus duct according to claim 4 or 5, further comprising a bottom portion that abuts on the bus duct. 7. The bus duct laying method according to claim 6, wherein the temporary placement jig has an overturn prevention portion extending in a direction intersecting the direction in which the bottom portion extends. 8. The bus duct installation method according to claim 1, wherein the upper end of the lower bus duct in the temporary placement step is at a height of 1.5 m or less from the predetermined floor. A method for constructing a bus duct structure, comprising assembling the bus duct structure using the installation method according to any one of claims 1 to 8.

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