JP2002359909A - Installation method of cable rack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the installation method of a cable rack which can install the cable rack in the air, reduce a floor space for building pipe scaffoldings, reduce the installation cost, and suppress obstructions against other construction works. SOLUTION: A protruding scaffold 20 is made to protrude by a distance of approximately a single span, a hanging bolt 2 is provided at a position one span apart, and an L-shaped angle 3 is attached to the hanging bolt 2. Then the protruding scaffold 20 is made to protrude further by a distance of approximately one span, a hanging bolt 2 is provided at a position one span apart, and an L-shaped angle 3 is attached to the hanging bolt 2. This procedure is repeated, and the L-shaped angle 3 is added every one span by a work in the air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laying a cable rack supported by a ceiling or a side wall and laid in the air, for example, for laying cables in plant construction.

[0002]

2. Description of the Related Art FIG. 31 is a perspective view showing an installed state of a cable rack. In FIG. 31, the cable rack 1
Is constructed by arranging a pair of parent girders 1a in parallel with each other, and connecting the bottoms of the pair of parent girders 1a at predetermined intervals by child girders 1b. Then, a pair of suspension bolts 2 is suspended from the ceiling at predetermined intervals along a cable laying route, and an L-shaped angle 3 is attached to a lower end of each pair of suspension bolts 2. The cable racks 1 are successively placed on the L-shaped angles 3 suspended at predetermined intervals in the air as described above, and the ends of the adjacent cable racks 1 are connected with the fittings 4.
And a bolt 5, and the main girder 1 a of the cable rack 1 is fixed to the L-shaped angle 3 by a steady bracket 6, and the cable rack 1 is installed along the cable laying route.

Next, a conventional cable rack laying method will be described with reference to FIG. First, a single-pipe scaffold 9 as a temporary scaffold composed of a single pipe 9a is assembled on the floor 8 over the entire length of the cable-laying path along the cable-laying path. At this time, since there are obstacles such as the water distribution pipe 11 on the floor 8, the single pipe scaffold 9 is assembled while avoiding these obstacles. Then, the scaffold plate 10 made of a steel plate is placed on the assembled single-tube scaffold 9.
Next, the worker climbs on the single pipe scaffold 9 and gets on the scaffold plate 10, and makes a hole for the anchor in the ceiling 7. The anchor holes are formed at a pitch of, for example, 1.5 m along the installation route so as to form a pair with the installation route of the cable rack 1 therebetween. Then, the anchor is driven into each hole, and the suspension bolt 2 is fastened to the anchor. Next, the L-shaped angles 3 are fastened and fixed in three steps to each pair of suspension bolts 2 using nuts. And the cable rack 1 is an L-shaped angle 3
The main girder 1 a of the cable rack 1 is fixed to the L-shaped angle 3 by the steady rest 6. Further, the ends of the adjacent cable racks 1 are connected to each other by the fittings 4 and the bolts 5, and the cable rack 1 is laid.

[0004]

As described above, in the conventional cable rack 1 laying operation, the single pipe scaffold 9 has to be installed along the entire laying route along the laying route. Therefore, a large amount of scaffolding material (single pipe 9a) is required, and a large amount of labor is required for carrying the scaffolding material to the work place, assembling and dismantling the scaffold, and removing the scaffold from the work place, thereby increasing the construction cost. There were challenges. In addition, the single pipe scaffolding 9 installed on the floor 8 occupies a large space, and the single pipe scaffolding 9 is required for a long period of time. Other works such as plumbing were delayed,
There was also a problem that the construction period was prolonged. Water pipe 1
If facilities such as 1 are already installed under the cable rack 1 installation route, it is necessary to assemble the single-pipe scaffold 9 avoiding these existing facilities, and the scaffolding material increases accordingly. Loading into the work place, assembling and dismantling the scaffold,
In addition, there has been a problem that the labor and the construction cost for removing from the work place are further increased. Further, since the cable laying work is not usually performed subsequent to the cable rack 1 laying, the single pipe scaffold 9 which is an obstacle to the passage of a person or a car is once dismantled after the cable rack 1 is laid, and assembled again when the cable is laid. And it was extremely inefficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A temporary scaffold is installed within a range of several spans of the suspension bolt, and the suspension bolt and the suspension bolt for several spans are provided by using the temporary scaffold. After installing the L-shaped angle, the protruding scaffold is protruded using the L-shaped angle, and the suspension bolt, the L-shaped angle, and the cable rack are sequentially installed along the installation route using the protruding scaffold. ,
Reduce the installation area of temporary scaffolds installed on the floor,
Furthermore, the space under the cable rack installation route is freed, the labor for assembling and disassembling temporary scaffolding is reduced, construction costs are reduced, passage for people and vehicles is secured, and obstacles to other construction work are eliminated. It is an object of the present invention to obtain a cable rack laying method that can be suppressed.

[0006]

According to the present invention, a hanging bolt is suspended from a ceiling at predetermined intervals in a rack installation direction from a ceiling, and an L-shaped angle is attached to each pair of the hanging bolts. In a cable rack laying method in which the cable rack is fixed to the L-shaped angle and is arranged in the rack laying direction, a pair of beams arranged parallel to each other on the protruding scaffold. Slidably supporting at least the two L-shaped angles at the forefront in the rack installation direction, and after the pair of beams are slid in the rack installation direction to protrude by approximately one span. Coupling the pair of beams to at least the two frontmost L-shaped angles in the rack installation direction; and forming the pair of beams of the projecting scaffold. The pair of suspension bolts is suspended from the ceiling at a position one span away from the work floor provided on the extension side in the rack installation direction, and the L-shaped angle is horizontally disposed on the pair of suspension bolts. And a step of performing

After distributing the L-shaped angle for three spans in the rack installation direction, the cable rack is erected on the L-shaped angle for two spans excluding the L-angle at the forefront in the rack installation direction. It has a fixing step.

Further, the work floor is located vertically below the pair of beams.

A step of extending a scaffold plate supporting member from the L-shaped angle to one side in the rack installation direction in parallel with the L-shaped angle; and erecting a scaffold plate on the scaffold plate supporting material; Fixing step.

Further, the scaffold plate is located vertically below the L-shaped angle.

In addition, prior to the step of horizontally disposing the L-shaped angle at a position one span away from the work floor provided on the projecting side of the pair of beams of the projecting scaffold in the rack installation direction, the buckling is performed. The method further comprises a step of sandwiching the prevention member between the projecting side of the pair of beams and the ceiling.

Further, prior to the step of horizontally arranging the L-shaped angle at a position one span away from the working floor erected on the side of the projecting scaffold on the projecting side of the pair of beams and in the rack laying direction, a suspension bolt is provided. The method further comprises a step of disposing an opening prevention tool between the hanging bolts adjacent to the rack installation direction in the forefront of the rack installation direction.

Further, hanging bolts are suspended from the ceiling at predetermined intervals in the rack installation direction from the ceiling, and L-shaped angles are attached to the respective pairs of the suspension bolts to horizontally extend at predetermined intervals in the rack installation direction. In a cable rack laying method in which a cable rack is fixed to the L-shaped angle and arranged in the rack laying direction, a first aerial moving scaffold having a work floor erected between a pair of upper structural members is provided. A second aerial moving scaffold having a work floor laid between a pair of lower structural members is attached to a scaffold support bracket attached to the ceiling of each of the two pairs of the hanging bolts in the rack installation direction. And the lower structural material are slidably supported,
Positioning the first aerial moving scaffold in the second aerial moving scaffold and suspending the first aerial moving scaffold on the two pairs of hanging bolts; Moving the pair of the hanging bolts to the ceiling, and suspending the pair of the hanging bolts on the ceiling; and following the hanging bolt hanging step, the scaffold is provided on the ceiling side of the foremost pair of the hanging bolts in the rack installation direction. Subsequent to the scaffold support fitting attaching step of attaching a support fitting, and the scaffold support fitting attaching step, the first aerial moving scaffold is moved forward by about 1 span in the rack installation direction, and the upper structural member is moved to the rack. A first aerial moving scaffold suspension step of slidably supporting the foremost scaffold support in the laying direction and suspending the first aerial moving scaffold on the foremost two pairs of the hanging bolts in the rack laying direction; The above Subsequent to the aerial moving scaffold suspending step, the second aerial moving scaffold is moved forward by about one span in the rack installation direction, and the lower structural member is slid to the foremost scaffold support bracket in the rack installation direction. Freely from the front to the rear in the rack installation direction.
An L-shaped angle setting step of horizontally setting an L-shaped angle on the second pair of hanging bolts.

[0014] Further, following the L-shaped angle setting step, the scaffold plate supporting member is moved from the third L-shaped angle to the rear in the rack mounting direction in the rack mounting direction in parallel with the L-shaped angle. Extending to the side,
Erecting a scaffold plate on the scaffold plate support material.

Further, the scaffold plate is located vertically below the L-shaped angle.

In the hanging bolt hanging step, a drill is attached to a tip of the upper structural member, and the drill is remotely driven from a work floor of the second aerial moving scaffold to drill holes for hanging bolts on the ceiling. It is something to do.

In addition, the dust generated at the time of drilling is removed by suction.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a perspective view showing a protruding state of a protruding scaffold in a cable rack laying method according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a fixing bracket applied to the cable rack laying method according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a method of fixing a protruding scaffold in the cable rack laying method according to the first embodiment of the present invention. FIG. 3 (a) is a cross-sectional view thereof, and FIG. It is the side view.

In FIG. 1 and FIG.
Reference numeral 0 denotes a pair of beams 21, a handrail 22 fixed to the tips of the pair of beams 21, and a work floor 23 detachably mounted on the tip side of the pair of beams 21. The fixing bracket 25 includes a main body 26, a pair of hooks 27 extending parallel to each other from both ends of the main body 26, and a main body 2.
6 is composed of a nut portion 28 fixed to the center and a screw 29 screwed to the nut portion 28. Here, at the tip of each hook 27, hook portions 27a are formed on both sides. A through hole is formed in the center of the main body 26, and a screw 29 screwed to the nut 28 is provided.
Is extended to the extension side of the hook 27.

The projecting scaffold 20 constructed as described above
Means that a pair of beams 21 is provided inside each pair of suspension bolts 2,
In addition, it is arranged on the L-shaped angle 3 outside the cable rack 1, and the L-shaped angle 3
And protrude for about 1 span. At this time, the beam 21 is fixed to the two adjacent L-shaped angles 3 on the protruding side of the protruding scaffold 20 (that is, the two front L-shaped angles 3 in the rack installation direction) by the fixing bracket 25. Then, the work floor 23 is mounted on the distal end side of the pair of beams 21. Here, as shown in FIG. 3, the fixing bracket 25 is mounted so that the beam 21 is inserted into the pair of hooks 27 from above, and the hook portions 27a are
The beam 21 is fastened and fixed (coupled) to the L-shaped angle 3 by hooking the vertical piece of the mold angle 3 and tightening the screw 29. Then, by slightly loosening the screw 29, the fastening between the hook portion 27a and the vertical piece of the L-shaped angle 3 is loosened, and the beam 21 can slide on the horizontal piece of the L-shaped angle 3, and the hook portion 27a and the L By loosening the screw 29 until the engagement of the mold angle 3 with the vertical piece is released, the fixing bracket 25 can be removed.

Next, a method of laying the cable rack 1 using the projecting scaffold 20 will be described with reference to FIGS. 4 and 5. FIG. Here, the cable rack 1 is about 3
m, the arrangement pitch (1 span: S) of the L-shaped angle 3 is about 1.5 m, and the length of the beam 21 is 4.5 m (about 3 spans).

First, a single-pipe scaffold 9 for two spans is assembled on the starting end side of the cable rack 1 laying route, and a scaffold plate 10 is placed on the single-pipe scaffold 9. Next, the worker climbs the single-pipe scaffold 9 and gets on the scaffold plate 10, and drills six holes (two spans) on the ceiling 7 for anchors. Then, the anchor is driven into each hole, and the suspension bolt 2 is fastened to the anchor. Further, the L-shaped angle 3 is fastened and fixed in two steps to each pair of suspension bolts 2 using a nut. Then, the cable rack 1 is installed on the L-shaped angle 3, and the main girder 1 a of the cable rack 1 is fixed to the L-shaped angle 3
To be fixed. As a result, as shown in FIG. 4A, the cable rack 1 is connected to the L-shaped angle 3 for two spans.
Are laid in two stages.

Next, the projecting scaffold 20 is lifted on the scaffold plate 10 using the single-tube scaffold 9. Then, the protruding scaffold 20 is fixed to the L-shaped angle 3 by the fixing bracket 25 so as to protrude by one span as shown in FIG. Therefore, as shown in FIG. 4B, the worker gets on the work floor 23, makes a hole for an anchor at a predetermined position with a drill 30, and drives the anchor into the hole. Next, as shown in FIG. 4C, the suspension bolt 2 is fastened to the anchor, and the L-shaped angle 3 is fixed to the suspension bolt 2 in two steps. Then, the two fixing brackets 25 are attached to the lower L-shaped angle 3 and the beam 21 in a loosely fitted state (slidable state).

Next, the four fixing brackets 2 in the fastened state
Loosen the screw 29 of 5 and slide the beam 21 to protrude. At this time, the protruding scaffold 20 attempts to rotate around the newly mounted fixing bracket 25 as a fulcrum so that the leading end side of the scaffold falls by its own weight and the rear end side of the scaffolding 20 rises. The projection 25 supports the L-shaped angle 3 so as not to be separated from the L-shaped angle 3, so that the projecting operation of the projecting scaffold 20 is stably performed. When the amount of protrusion of the protruding scaffold 20 increases, the rear end of the beam 21 (the end in the direction opposite to the rack installation direction) comes off from the fixing bracket 25, and the fixing bracket 25 on the rear end side is removed. Then, after the protruding scaffold 20 is protruded by one span, the screws 29 of the remaining four fixing brackets 25 are tightened, and the protruding scaffold 20 is fixed.

Next, as shown in FIG.
A hole for an anchor is made at a predetermined position by a drill 30, and the anchor is driven into the hole. Next, as shown in FIG. 5A, the suspension bolt 2 is fastened to the anchor, and the L-shaped angle 3 is fixed to the suspension bolt 2 in two steps. Then, the two fixing brackets 25 are connected to the lower L-shaped angle 3 and the beam 2.
1 is loosely fitted. Then, the screws 29 of the four fixing brackets 25 in the fastened state are loosened, and the beam 21 is extended to protrude by one span. Then, the two fixing brackets 25 at the rear end are removed, and the remaining four fixing brackets 2 are removed.
The fifth screw 29 is tightened, and the projecting scaffold 20 is fixed.

Next, as shown in FIG.
A hole for an anchor is made at a predetermined position by a drill 30, and the anchor is driven into the hole. Next, as shown in FIG. 5C, the suspension bolt 2 is fastened to the anchor, and the L-shaped angle 3 is fixed to the suspension bolt 2 in two steps. Then, the two fixing brackets 25 are connected to the lower L-shaped angle 3 and the beam 2.
1 is loosely fitted. Further, as shown in FIG. 5D, the cable rack 1 is placed on the L-shaped angle 3 for two spans, and the ends of the adjacent cable racks 1 are connected to each other by the fittings 4 and the bolts 5. The cable rack 1 is laid on the L-shaped angle 3 for four spans.

The operation steps shown in FIGS. 4B to 4D and FIGS. 5A to 5D are repeated, and the cable rack 1 is laid along the laying route. Here, when it is necessary to bend the installation route of the cable rack 1 at a right angle in the middle of the route, the single pipe scaffold 9 is assembled at that point, and (b) to (d) of FIG. 4 and (a) of FIG. ~
The operation step (d) is repeatedly performed.

As described above, according to the first embodiment,
Hanging bolt 2, L-shaped angle 3, and cable rack 1
Can be installed in the air, so that there is no need to install the single pipe scaffold 9 over the entire length of the cable rack 1 installation route. Therefore, since the scaffolding material (single pipe 9a) is greatly reduced, the scaffolding material can be easily carried into the work place, the scaffold can be assembled, dismantled, and removed from the work place, and the construction cost can be reduced. Can be. Further, since the space occupied by the single pipe scaffold 9 installed on the floor 8 can be reduced, there is no obstruction to the passage of people and vehicles, and there is no need for mechanical piping work under the cable rack 1. Other works will be performed concurrently, and the construction period will be shortened. Further, even when facilities such as the water distribution pipe 11 are already installed under the installation route of the cable rack 1, the installation space for the single pipe scaffold 9 is small, and thus the single pipe scaffold 9 is assembled avoiding these existing facilities. be able to. Therefore, there is no increase in scaffolding material due to avoiding existing facilities. Further, since the hooks 27a are provided on both sides of the fixture 25, the hooks 27a can be engaged with the vertical pieces of the L-shaped angle 3 regardless of the orientation of the fixture 25, so that the attachment of the fixture 25 is simplified. Become.

Here, it is desirable that the beam 21 and the handrail 22 of the projecting scaffold 20 be made of aluminum in consideration of the work load to reduce the weight. Also,
Although the pair of beams 21 constituting the protruding scaffold 20 are arranged between the suspension bolt 2 and the cable rack 1, the pair of beams 21 may be arranged outside the suspension bolt 2.

Embodiment 2 FIG. FIG. 6 is a perspective view showing a protruding state of the protruding scaffold in the cable rack laying method according to Embodiment 2 of the present invention. In FIG.
The work floor 23A is bent and formed in a U-shape so as to drop the floor surface. The work floor 2 is replaced with the work floor 2
The configuration is the same as that of the first embodiment except that 3A is used.

Therefore, also in the second embodiment, the same effects as in the first embodiment can be obtained. Further, according to the second embodiment, since the work floor 23A is bent and formed in a U-shape so as to drop the floor surface, the work position of the worker is dropped to the floor 8 side, and the work position of the worker is reduced. More space. Therefore, in the first embodiment, the worker is forced to work while sitting, but in the second embodiment,
Thus, the worker can stand and work, and the work load on the worker is significantly reduced.

Embodiment 3 FIG. FIG. 7 is a perspective view showing a protruding state of the protruding scaffold in the cable rack laying method according to Embodiment 3 of the present invention. In FIG.
The protruding scaffold 20 </ b> A includes a pair of beams 21, a handrail 22 fixed to the tips of the pair of beams 21, and a pair of beams 2.
A work floor 23 is detachably mounted on the distal end of the beam 1, and a sheath 31 is fixed to the lower surface of each beam 21. The sheaths 31 are attached to the beams 21 one by one at a predetermined distance in the length direction of the beam 21 so that the hole direction is orthogonal to the length direction of the beam 21. The auxiliary beam 32 is inserted into the sheath 31 to change the installation direction.

Next, a characteristic part of the cable rack laying method according to the third embodiment will be described. First, the cable rack 1 is laid in the first laying direction (the direction of the arrow A in FIG. 7) in the same manner as in the first embodiment. When the cable rack 1 is laid to a position where the laying direction is changed to the second laying direction (the direction of the arrow B in FIG. 7), first, the two auxiliary beams 32 are inserted into the sheath 31, and FIG. It is extended for one span in parallel with the direction of the middle arrow B,
The work floor 23 is installed on two auxiliary beams 32. Then, the worker gets on the working floor 23 on the projecting scaffold 20A and the auxiliary beam 32, makes a hole for an anchor, drives the anchor into the hole, and attaches the suspension bolts 2a, 2b, 2c at intervals of one span. Next, the worker projects from the work floor 23 on the auxiliary beam 32, moves to the work floor 23 of the scaffold 20A, removes the auxiliary beam 32, and attaches the L-shaped angle 3 to the suspension bolts 2a, 2b in two steps.
Further, the projecting scaffold 20A is moved in the direction of arrow B in FIG.
It is placed on the lower L-angle 3 attached to the suspension bolts 2a and 2b so as to protrude by the span, and is fixed to the lower L-angle 3 attached to the suspension bolts 2a and 2b by the fixing bracket 25. Then, the worker moves onto the working floor 23 mounted on the tip end side of the protruding scaffold 20A, and attaches the L-shaped angles 3 to the suspension bolts 2c in two steps. Thereby, the laying direction is changed from the first laying direction to the second laying direction, and thereafter, the cable rack 1 is laid in the second laying direction in the same manner.

Therefore, also in the third embodiment, the same effect as in the first embodiment can be obtained. Further, according to the third embodiment, since the laying direction of the cable rack 1 can be changed in the air, there is no need to assemble the single pipe scaffold 9 at the place where the laying direction is changed as in the first embodiment. In addition, the number of times the scaffold material is carried into the work place, the number of times the scaffold is assembled and dismantled, and the number of times the scaffold is removed from the work place can be reduced, and the construction cost can be reduced.

Embodiment 4 FIG. FIG. 8 is a perspective view showing a protruding state of the protruding scaffold in the cable rack laying method according to the fourth embodiment of the present invention, and FIG. 9 is a temporary scaffold material applied to the cable rack laying method according to the fourth embodiment of the present invention. FIG. 10 is a side view showing a state in which a holding frame of a temporary scaffold applied to a cable rack laying method according to Embodiment 4 of the present invention is attached to an L-shaped angle.

9 and 10, the temporary scaffold 4
0 is a holding frame 41 attached to the L-shaped angle 3,
A scaffold plate support member 47 extending from the holding frame 41 in parallel with the L-shaped angle 3 and supporting the scaffold plate 48 is provided. The holding frame 41 is manufactured by drawing aluminum and has a hollow holding portion 42 provided with an insertion hole 42 a having a rectangular cross section for inserting the scaffold plate support member 47, and is integrally formed on one side upper portion of the holding portion 42. L-shaped angle 3
A groove 43a for inserting the horizontal piece 3a is formed by an upper piece 43c and a lower piece 43b.
A support arm 44 extending outward from one side surface of the holding portion 42 and receiving the distal end of the vertical piece 3b of the L-shaped angle 3;
A fixing screw 46 for screwing the horizontal piece 3a of the L-shaped angle 3 inserted into the groove 43a to prevent the L-shaped angle 3 from coming off; And a fixing screw 46 for screwing the scaffold support member inserted into the insertion hole 42a and screwed to the other side surface. The insertion hole 42a of the holding portion 42 is
Is parallel to the length direction. Further, a projection 44a is provided at the tip of the support arm 44.

The scaffold plate support member 47 is formed into a hollow rectangular rod having a rectangular outer shape substantially matching the inner diameter shape of the insertion hole 42a of the holding portion 42 by drawing aluminum. A through hole 47 a for supporting a handrail is formed at one end of the scaffold plate support member 47.

Next, a characteristic part of the cable rack laying method according to the fourth embodiment will be described. First, the cable rack 1 is laid in the same manner as in the first embodiment. Each time the projecting scaffold 20 is extended for one span, the suspension bolt 2 is suspended from the ceiling 7, and each time the L-shaped angle 3 is attached to the suspension bolt 2 in two steps, it is temporarily installed in the lower L-angle 3 thereof. The scaffold 40 is attached.

That is, first, as shown in FIG. 10, the holding frame 41 engages the horizontal piece 3a of the L-shaped angle 3 with the groove 43a.
It is attached to the L-shaped angle 3 from the tip side of the horizontal piece 3a so as to be housed inside. After the horizontal piece 3a is completely inserted into the groove 43a, the fixing screw 46 is tightened, and the holding frame 41 is attached to the L-shaped angle 3. In addition, receiving part 4
4b is in contact with the tip of the vertical piece 3b,
Clockwise rotation during 0 is prevented.

Next, the scaffold plate support member 47 is inserted into the insertion hole 42a of the holding portion 42 of the holding frame 41, and the fixing screw 46 is tightened.
The temporary scaffolding material 40 is fixed temporarily to 1). At this time, as shown in FIG. 8, the holding frame 41 is attached to the center of the horizontal piece 3a of the L-shaped angle 3 supporting the cable rack 1, and the scaffolding plate support 47 attached to the holding frame 41 is connected to the cable. The rack 1 extends to one side. Then
The handrail support 49 is inserted and fixed in the through hole 47 a of the scaffold plate support 47. Furthermore, the scaffold plate 48 is
7 and is fixed to the scaffold support 47 by set screws (not shown).

In this manner, the temporary scaffold 40 and the scaffold plate 48 are laid along with the work of laying the L-shaped angle 3 by protruding the protruding scaffold 20 by one span, whereby FIG. As shown, the scaffold plate 48 will be laid in parallel with the cable rack 1.

According to the fourth embodiment, in addition to the effect of the first embodiment, the scaffold plate 48 is laid in parallel with the cable rack 1, so that the cable rack 1 can be attached to the L-shaped angle 3. The fixing work and the fixing work between the cable racks 1 can be performed from the scaffold plate 48, so that the workability is improved and the work load of the worker can be reduced. Further, since the scaffold plate 48 is laid in parallel with the cable rack 1, the cable laying operation, the cable laying operation, and the cable laying operation are performed using the scaffold plate 48 during the cable laying operation. The binding work can be performed. Therefore, it is not necessary to install the single pipe scaffolding 9 over the entire length of the installation route during the installation work of the cable, and the construction period and the cost can be reduced.

Here, in the fourth embodiment, the temporary scaffold 40 is composed of two parts, the holding frame 41 and the scaffold plate support 47. However, the holding frame 41 and the scaffold plate support 47 are used. And may be formed as one body. In the fourth embodiment, the fixing between the holding frame 41 and the L-shaped angle 3 is based on the fastening of the fixing screw 46.
The method of fixing the 1 to the L-shaped angle 3 is not limited to this.

Embodiment 5 FIG. FIG. 11 is a main part side view for explaining a cable rack laying method according to Embodiment 5 of the present invention. In FIG. 11, a buckling prevention jack 50 as a buckling prevention member protrudes and the beam 2 of the scaffold 20 is projected.
1 is rotatably attached to the rear end side. The other configuration is the same as that of the first embodiment.

Next, a characteristic part of the cable rack laying method according to the fifth embodiment will be described. First, the cable rack 1 is laid in the same manner as in the first embodiment. Then, the protruding scaffold 20 is protruded for one span and fixed to the adjacent L angle 3 by the fixing bracket 25, and then the buckling prevention jack 50 is set up vertically. Then, the elevation handle 51 is operated to operate the male screw rod 52.
Is raised, and the receiving portion 53 is pressed against the ceiling 7. Thereafter, the user rides on the work floor 23 of the protruding scaffold 20, attaches the suspension bolts 2, and attaches the L-shaped angle 3. Then, the male screw rod 52 is lowered by operating the elevating handle 51, the receiving portion 53 is separated from the ceiling 7, and the process proceeds to the projecting operation for the next span of the projecting scaffold 20.

Here, when the worker gets on the work floor 23 on the tip side of the protruding scaffold 20, the load is applied to the fixing bracket 25 for fixing the foremost L-shaped angle 3 and the beam 21 in the installation direction. And acts to lift the rear end side of the beam 21. When the buckling prevention jack 50 is not provided, the stress is applied to the L-shaped angle 3 in the anti-laying direction via the fixing bracket 25 for fixing the L-shaped angle 3 in the anti-laying direction and the beam 21. In addition, there is a danger that the suspension bolt 2 will buckle. According to the fifth embodiment, the buckling prevention jack 50 is provided with the protruding scaffold 20 protruding by one span.
Is sandwiched between the rear end of the beam 21 and the ceiling 7, the stress acting to lift the rear end of the beam 21 is applied to the ceiling 7 via the buckling prevention jack 50. As a result, the buckling of the hanging bolt 2 is prevented without acting on the hanging bolt 2.

Embodiment 6 FIG. In each of the above embodiments, the cable rack 1 is laid on the L-shaped angle 3 attached to the suspension bolt 2 suspended from the ceiling 7, but in the sixth embodiment, it is shown in FIG. As described above, the cable rack 1 is laid on the L-shaped angle 3 horizontally extended on the support plate 60 attached to the side wall surface of the room along the laying path at every span.

Next, a characteristic part of the cable rack laying method according to the sixth embodiment will be described. First, as in the first embodiment, the single-pipe scaffold 9 for two spans is assembled at the start end side of the cable rack 1 laying route, and the scaffold plate 10 is placed on the single-pipe scaffold 9. Next, the worker climbs the single pipe scaffold 9 and gets on the scaffold plate 10, and drills holes for anchors on the side wall surface for two spans. Then, the anchor is driven into each hole, the fixing screw 62 is fastened to the anchor, and the support plate 60 is attached to the side wall surface. Further, the L-shaped angle 3 is made horizontal and welded to the support plate 60, and the reinforcing member 61 is further welded to the support plate 60 and the L-shaped angle 3. And the cable rack 1 is an L-shaped angle 3
The main girder 1 a of the cable rack 1 is fixed to the L-shaped angle 3 by the steady rest 6. As a result, the cable rack 1 is laid in two stages on the L-shaped angle 3 for two spans.

Next, as shown in FIG. 12, the fixing scaffold 20 is set in a state where the protruding scaffold 20 protrudes by one span.
5 fixes it to the L-shaped angle 3. Then, an operator gets on the work floor 23, drills a hole for an anchor at a predetermined position on the side wall surface with the drill 30, and drives the anchor into the hole. Then, the support plate 60 is attached by fastening the fixing screw 62 to the anchor, and the L-shaped angle 3 is fixed to the support plate 60 in two steps. Then, the two fixing brackets 25 are attached so that the lower L-shaped angle 3 and the beam 21 are loosely fitted. Next, the screws 29 of the four fixing brackets 25 in the fastened state are loosened, and the beam 21 is extended and projected. Then, after the protruding scaffold 20 is protruded by one span, the screws 29 of the remaining four fixing brackets 25 are tightened, and the protruding scaffold 20 is fixed. Thereafter, the cable rack 1 is laid in the same manner as in the first embodiment. Therefore, also in the sixth embodiment, the same effects as in the first embodiment can be obtained.

Embodiment 7 FIG. FIG. 13 is a cross-sectional view of a main part showing a beam fixing state of a protruding scaffold in a cable rack laying method according to Embodiment 7 of the present invention, and FIG.
3 is a sectional view taken along the line XIV-XIV in FIG. 13 and 14, the beam 21A is formed into a hollow rectangular rod having a rectangular external shape by, for example, drawing aluminum, and a slit 21a is formed at the center of two opposing sides over the entire length in the length direction. The protruding scaffold uses a beam 21A instead of the beam 21 in the protruding scaffold 20 of the first embodiment.
A, and a handrail 2 fixed to the tips of a pair of beams 21A
2 and a work floor 23 erected on the tip side of the pair of beams 21A. The fixing bracket 33 includes an L-shaped main body 34 having a hook 34a provided at one end and a hole 34b formed at the center of the other side, a thumb screw 35 inserted through the hole 34b, and a short side. Is shorter than the width of the slit 21a,
Also, the stopper 36 is formed in a rectangular flat plate having a longer side longer than the width of the slit 21a, and has a screw hole formed in the center thereof into which a thumbscrew 35 is screwed.

The projecting scaffold is composed of a pair of beams 2.
1A is disposed on the L-shaped angle 3 outside each of the suspension bolts 2, and is fixed to the two front L-shaped angles 3 on the protruding side by a fixing bracket 33, and is protruded for about one span and installed. . Here, the fixing bracket 33 engages the hook portion 34a with the vertical piece 3b of the L-shaped angle 3 while the thumb screw 35 is inserted into the hole 34b and the stopper 36 is screwed, and the other side is the beam 21A. To Then, the stopper 36 is inserted into the beam 21A from the slit 21a, and then the stopper 36 is turned 90 degrees, the thumb screw 35 is tightened, and the beam 21A is fastened and fixed to the L-shaped angle 3. By slightly loosening the thumb screw 35, the fastening between the fixing bracket 33 and the beam 21A is loosened, and the beam 21
A can slide on the L-shaped angle 3. At this time, the screw portion of the thumbscrew 35 passes through the slit 21a,
The beam 21A slides. Then, when the rear end of the beam 21A passes through the fixing bracket 33, the fixing bracket 33 is removed.

In the seventh embodiment, instead of the beam 21 and the fixture 25, the beam 21A and the fixture 3 are used.
3, the cable rack is laid in the same manner as in the first embodiment. Therefore, also in the seventh embodiment, the same effect as in the first embodiment can be obtained.
It goes without saying that the beam 21A may be arranged between the suspension bolt 2 and the cable rack.

Embodiment 8 FIG. FIG. 15 is a perspective view of a main part showing a beam fixing state of the projecting scaffold in the cable rack laying method according to the eighth embodiment of the present invention. FIG. 16 is a perspective view of the projecting scaffold in the cable rack laying method according to the eighth embodiment of the present invention. Main part sectional view showing the beam fixed state,
FIG. 17 is an exploded perspective view showing the beam fixing bracket of the protruding scaffold in the cable rack laying method according to Embodiment 8 of the present invention.

In FIGS. 15 and 16, the beam support member 37 is longer than the length of the L-shaped angle 3 by, for example, drawing aluminum and has the same inner diameter as the insertion hole 42a of the holding portion 42 of the holding frame 41. The hollow rectangular rod body having a rectangular outer shape is formed, and a slit 37a is formed at the center of two opposing sides over the entire length in the length direction. Fixture 3
8 is a rectangular flat plate-shaped fixing plate 39 having two holes 39a formed at diagonal positions, and a thumb screw 35 inserted into the hole 39a.
And a stopper 36 formed in a rectangular flat plate having a shorter side shorter than the width of the slit 21a and a longer side longer than the width of the slit 21a, and having a screw hole in which a thumbscrew 35 is screwed in the center. And a stopper 36A having a short side shorter than the width of the slit 37a and a long side formed in a rectangular flat plate shape longer than the width of the slit 37a, and having a screw hole in the center portion into which the thumbscrew 35 is screwed. It is composed of

Next, a characteristic portion of the cable rack laying method according to the eighth embodiment will be described. First, as in the first embodiment, the cable racks are distributed in two spans at the start end of the cable rack installation route. Then, the holding frame 41 is attached to the two front L-shaped angles 3 in the rack installation direction. Next, the beam support member 37 is inserted into the insertion hole 42 a of each holding portion 42 so that both ends extend from both ends of the L-shaped angle 3, and is fixedly fixed to the holding frame 41 by the fixing screw 46.

Therefore, one thumbscrew 35 is attached to the fixing plate 39.
Is inserted into the hole 39a from one side and screwed into the screw hole of the stopper 36A, and another thumbscrew 35 is inserted into the hole 39a from the other side of the fixing plate 39 and screwed into the screw hole of the stopper 36. , The fixing bracket 38 is assembled. Then, the fixing bracket 38 inserts the stopper 36A into the beam support member 37 from the slit 37a, turns the stopper 36A 90 degrees, tightens the thumbscrew 35, and is fixedly attached to both ends of the beam support member 37. . Then, a pair of beams 21A of the protruding scaffold are respectively supported by the beam support members 37.
The stopper 36 is disposed on the fixing plate 39 of the fixing bracket 38 attached to both ends of the beam 2 through the slit 21a.
1A, turn the stopper 36 90 degrees and turn the thumbscrew 3
5 is tightened, and a projecting scaffold is installed.

Next, the thumbscrew 35 is slightly loosened, and the beam 21A is slid on the beam supporting member 37 to protrude the protruding scaffold for about one span. At this time, the thread of the thumbscrew 35 passes through the slit 21a, and the beam 21A slides. Then, the thumb screws 35 are tightened, and the beams 21A are fixed to the beam support members 37 attached to the two front L-shaped angles 3 on the protruding side by the fixing brackets 38, respectively. As a result, the protruding scaffold protrudes by about one span and is fixed.

Next, the worker stands on the working floor of the protruding scaffold and suspends a pair of suspension bolts 2 at a position one span away. Then, the L-shaped angle 3 is connected to the pair of hanging bolts 2.
Attach to Thereafter, the holding frame 41 is attached to the front L-shaped angle 3, the beam support 37 is attached to the holding frame 41, and the fixing brackets 38 are attached to both ends of the beam support 37. Then, the beam 21A is fixed to 2
The thumbscrew 35 of the pair of fixing brackets 38 is slightly loosened, and the projecting scaffold is slightly protruded, and the beam 21A is placed on the frontmost fixing bracket 38. Therefore, the slit 21 of the beam 21A
A stopper 36 is inserted into a, and the thumbscrew 35 is tightened to slidably connect the front fixing bracket 38 and the beam 21A. Thereafter, the protruding scaffold is protruded for about one span, and each thumbscrew 35 is tightened to fix the protruding scaffold to the beam support 37. Thereafter, the cable rack is laid in the same manner as in the first embodiment.

As described above, in the eighth embodiment, the beam 21A is protruded by sliding the beam 21A on the beam support member 37 mounted on the holding frame 41 mounted on the L-shaped angle 3, and the scaffold is protruded in the rack installation direction. Since the cable rack is laid, the same effects as in the first embodiment can be obtained. In the eighth embodiment, the beam 21A is slidably supported or coupled to the L-shaped angle 3 via the support frame 41, the beam support 37, and the fixture 39, that is, indirectly. Will be.

Embodiment 9 FIG. 18 is a perspective view showing a protruding state of the protruding scaffold in the cable rack laying method according to the ninth embodiment of the present invention, and FIG. 19 is a diagram illustrating a temporary scaffold plate mounting method in the cable rack laying method according to the ninth embodiment of the present invention. FIG. 20 is a perspective view showing a hanging bolt opening prevention tool applied to a cable rack laying method according to Embodiment 9 of the present invention.

In FIGS. 18 to 20, the support member 54
Is manufactured as a hollow square rod having a rectangular outer shape equivalent to the inner diameter shape of the insertion hole 42a of the holding portion 42 of the holding frame 41.
The support member 54 is inserted into the insertion hole 42 a of the holding portion 42 so as to extend both ends, and is fixedly fixed to the holding frame 41 by a fixing screw 46. The hanging member 55 is formed as a rectangular square hollow body having a rectangular insertion hole 55a formed at one end, and a fixing pin 56 at the other end of the support member 54 at both ends.
And suspended. Scaffolding board support 47A
Is formed in a hollow rectangular rod having a rectangular outer shape equivalent to the inner diameter of the insertion hole 55a, and a through hole (not shown) for supporting a handrail is formed at one end. This scaffold plate support 47
A is inserted into the insertion hole 55a of the pair of hanging members 55, is fixed by the fixing pin 57, and extends horizontally to one side of the L-shaped angle 3.

The hanging bolt opening preventing member 63 includes a first cylindrical portion 64 and a second cylindrical portion 64 which is housed in the first cylindrical portion 64 so as to be movable forward and backward.
A cylindrical portion 65, a fastening portion 66 for fastening and fixing the second cylindrical portion 65 to the first cylindrical portion 64, and first and second cylindrical portions 64 and 6;
5 and a suspension bolt gripping portion 67 attached to the end of the fifth bolt. The suspension bolt holding portion 67 includes a fixed nut portion 67a fixed to the ends of the first and second cylindrical portions 64 and 65, a movable nut portion 67b rotatably mounted on the fixed nut portion 67a, And an operation lever 67c extending from the movable nut portion 67b. Further, the fixed nut portion 67a and the movable nut portion 67b are formed with a thread groove for a half circumference.

Next, features of the cable rack laying method according to the ninth embodiment will be described. First, as in the first embodiment, the cable racks are distributed in two spans at the start end of the cable rack installation route. Then, the projecting scaffold 20 is placed on the L-shaped angle 3, and the beam 21 is fixed by the fixing bracket 25 to the L-shaped angle 3.
In a loose fit. Further, the holding frame 41 is attached to the two front L-shaped angles 3 in the rack installation direction, the support member 54 is inserted into the insertion hole 42 a of each holding portion 42, and is fixed to the holding frame 41 with the fixing screw 46. I do. Further, hanging members 55 are suspended from both ends of the support member 54, and the scaffold plate support member 4 is suspended.
7A is attached to the hanging member 55 so as to extend horizontally to one side of the L-shaped angle 3, and the scaffold plate 48 is attached to the scaffold plate support member 47.
It is erected on A.

Next, the first of the hanging bolt opening prevention tools 63
The suspension bolt grip 67 on the side of the cylindrical portion 64 is fitted into the suspension bolt 2, and the operation lever 67 c is operated to move the movable nut 6.
7b is rotated. Therefore, the suspension bolt holding portion 67 is fastened and fixed to the suspension bolt 2 by the fixed nut portion 67a and the movable nut portion 67b. Then, loosen the fastening part 66,
The second cylindrical portion 65 is pulled out from the first cylindrical portion 64, and the suspension bolt gripping portion 67 on the second cylindrical portion 65 side is connected to the adjacent suspension bolt 2.
Fit into Next, the operating nut 67b is rotated by operating the operation lever 67c, and the suspension bolt gripping portion 67 is fastened and fixed to the suspension bolt 2 by the fixed nut portion 67a and the movable nut portion 67b. Therefore, the first cylindrical portion 64 and the second cylindrical portion 65 are fixed by tightening the fastening portion 66. As a result, the suspension bolt opening prevention tool 63 is installed in tension between the adjacent suspension bolts 2. Similarly, the suspension bolt opening prevention tools 63 are respectively installed between the suspension bolts 2 adjacent in the rack installation direction. In FIG. 18, for convenience, the suspension bolt opening prevention tool 63 is installed only on one side of the L-shaped angle 3, but actually the suspension bolt opening prevention tool 63 is installed on both sides of the L-shaped angle 3. I have.

Then, the protruding scaffold 20 is protruded for about one span, and the beam 21 is fastened and fixed to the L-shaped angle 3 by the fixing bracket 25. Then, the worker projects the scaffold 2
A pair of suspension bolts 2 are suspended at a position 1 span away from the work floor 23, and the L-shaped angle 3 is attached to the pair of suspension bolts 2. Thereafter, the holding frame 41 is attached to the front L-shaped angle 3, and the scaffolding plate support 47A is similarly set.
Is attached, and the scaffold plate 48 is erected on the scaffold plate support 47A. In addition, the hanging bolt opening prevention tool 63 is installed between the foremost hanging bolts 2 in the rack installation direction. Further, the cable rack 1 is laid.

Next, the fixing bracket 25 is loosened, the projecting scaffold 20 is slightly protruded, and the fixing bracket 25 is loosely fitted to the front L-shaped angle 3 and the beam 21 in the rack installation direction. Then, the protruding scaffold 20 is protruded for about one span. Thereafter, the cable rack 1 is laid in the same manner as in the first embodiment.

As described above, in the ninth embodiment, in addition to the effect of the first embodiment, since the scaffold plate 48 is laid in parallel with the cable rack 1, the L-shaped angle of the cable rack 1 is set. 3 and the work of fixing the cable racks 1 to each other can be performed from the scaffold plate 48, so that the workability is improved and the work load is reduced. In addition, using the scaffold plate 48, wire extension work, cable arrangement work, and bundling work can be performed. Further, since the scaffold plate 48 is located below the L-shaped angle 3 and the beam 21, the worker can work without taking a cramped posture, and the work load is significantly reduced. Further, with the protruding scaffold 20 protruding by one span, the suspension bolt opening preventing tool 63 is installed in a tension state between at least the two frontmost suspension bolts 2 in the rack installation direction, so that the beam 21 is lifted. The acting stress is received by the suspension bolt opening prevention tool 63, and the occurrence of buckling of the suspension bolt 2 is reliably prevented.

In the first to ninth embodiments, at the start end of the cable rack installation route, the projecting scaffold is used to install the suspension bolts 2, the L-shaped angles 3, and the cable rack 1 in the air. L for 2 spans
Although the cable rack 1 is erected and fixed to the mold angle 3, the number of spans of the L-shaped angle 3 is not limited to two spans 2. And the single pipe scaffold 9 assembled at the start end side of the cable rack installation route
It is needless to say that the number of spans can be changed in accordance with the number of spans in which the L-shaped angle 3 is provided. further,
The projecting scaffold beam is slidably supported or fixed to the two L-angles 3 at the forefront in the rack installation direction. However, depending on the length of the beam, the three foremost beams in the rack installation direction may be used. Alternatively, it may be slidably supported or fixed to the four L-shaped angles 3.

Embodiment 10 FIG. FIG. 21 shows a first embodiment of the cable rack laying method according to the tenth embodiment of the present invention.
FIG. 22 is a perspective view showing an aerial moving scaffold. FIG. 22 is a perspective view showing a second example of a cable rack laying method according to Embodiment 10 of the present invention.
FIG. 23 is a perspective view showing a scaffold for aerial movement, FIG. 23 is a perspective view showing a scaffolding support bracket in a cable rack laying method according to Embodiment 10 of the present invention, and FIG. 24 is a cable rack laying method according to Embodiment 10 of the present invention. 25 is a perspective view showing a scaffolding support fitting in FIG. 25, FIG. 25 is a partially cutaway sectional view for explaining a scaffold mounting state in a cable rack laying method according to Embodiment 10 of the present invention, and FIG. FIG. 27 is a perspective view illustrating a drill mounting state in the cable rack laying method, FIG. 27 is an exploded perspective view illustrating a drill mounting state in the cable rack laying method according to the tenth embodiment of the present invention, and FIG. 28 is an embodiment of the present invention. FIG. 29 is a top view illustrating a drill mounting state in the cable rack laying method according to the tenth embodiment, and FIG. Process diagram illustrating the Bururakku laying method, FIG. 30 is a process diagram illustrating a cable rack laying method according to Embodiment 10 of the present invention.

In FIG. 21, a first aerial moving scaffold 70 is shown.
Are a pair of long upper structural members 7 which are disposed in parallel with each other and are longer than two spans of the suspended bolts 2 to be suspended.
1 and a work floor 72 suspended from a pair of upper structural members 71. The work floor 72 includes three pairs of frame members 7.
3 are suspended from the opposite longitudinal ends and the center of the pair of upper structural members 71, respectively, and three floor plate support members 74 (not shown) are provided between the lower ends of the frame members 73 of each pair. A floor plate 75 is supported by three floor plate support members 74 and disposed in parallel with the pair of upper structural members 71, and a handrail 76 is provided between frame members 73 adjacent in the length direction of the upper structural member 71. And a chain 77 is provided between a pair of frame members 73 on one side in the longitudinal direction of the upper structural member 71, and a chain 77 is provided between a pair of frame members 73 on the other side in the longitudinal direction of the upper structural member 71. It is configured.

Here, as shown in FIG. 25, the upper structural member 71 is formed into a hollow rectangular rod having a rectangular external shape by, for example, drawing aluminum, and a slit 71a is provided at the center of two opposed side surfaces in the longitudinal direction. Is formed over the entire length of. The pair of upper structural members 71 are provided with slits 71.
They are arranged parallel to each other with the two side surfaces on which a is formed facing up and down. Further, each of the frame members 73 is fastened and fixed to the opposing side surfaces of the pair of upper structural members 71 by bolts 78 and nuts 79 and suspended from the upper structural members 71. Furthermore, a cylindrical collar 80 is loosely fitted to a bolt 78 between the upper structural member 71 and the frame member 73. As shown in FIG. 25, the floor plate support member 74 has a large-diameter pipe 74a connected to the lower end of one frame member 73 and a small-diameter pipe 74b connected to the lower end of the other frame member 73. Take a double pipe structure by inserting
The gap between the pair of frame members 73 can be adjusted by changing the extension of the pipe 74b from the pipe 74a.

In FIG. 22, the second aerial moving scaffold 81
Are a pair of long lower structural members 8 that are disposed in parallel with each other and are longer than two spans of the suspended bolts 2 to be suspended.
2 and a work floor 83 suspended from a pair of lower structural members 82. The work floor 83 has three pairs of frame members 8.
4 are suspended from both longitudinal ends and a central portion of the lower surface of the pair of lower structural members 82, respectively, and three floor plate supporting members 8 are provided.
5 (not shown) is installed between the lower ends of each pair of frame members 84,
A floor plate 86 is supported by three floor plate support members 85 and is disposed in parallel with the pair of lower structural members 82, and a handrail 87 is provided between frame members 84 adjacent in the longitudinal direction of the lower structural member 82 and the lower structural member 82. The frame 82 is constructed to extend between a pair of frame members 84 on the other side in the longitudinal direction of the member 82.

As shown in FIG. 25, the lower structural member 82 is formed into a hollow rectangular rod having a rectangular external shape by, for example, drawing aluminum, and a slit 82a is formed at the center of two opposed side surfaces in the longitudinal direction. Is formed over the entire length of. Then, the pair of lower structural members 82
They are arranged parallel to each other with the two side surfaces on which a is formed facing up and down. Further, in each of the frame members 84, the female screw portion 84a is formed on the upper end surface with the screw center aligned with the length direction of the frame member 84, and the female screw portion 84a is formed on the lower surface of the pair of lower structural members 82 by the slit 82a. The lower structural member 82 is fastened and fixed to a male screw portion of a connecting screw 88 extending from
It is suspended in. Also, as shown in FIG. 25, the floor plate supporting member 85 includes a large-diameter pipe 85a connected to the lower end of one frame member 84 and a small-diameter pipe 85b connected to the lower end of the other frame member 84. Is adopted, and the gap between the pair of frame members 84 can be adjusted by changing the amount of extension of the pipe 85b from the pipe 85a. Note that the gap between the pair of upper structural members 71 matches the gap between the pair of lower structural members 72, and the first aerial moving scaffold 7.
The work floor 72 of No. 0 is housed inside the work floor 83 of the second aerial moving scaffold 81.

23 and 24, the scaffolding support 90 has a first insertion hole 92 through which the upper structural member 72 is inserted.
And a second insertion hole 93 through which the lower structural member 82 is inserted. The metal frame 91 is formed in two stages, upper and lower, and a mounting piece extending from the upper portion of the frame 91 to one side of the frame 91. 94. A first guide groove 91 a into which the bolt 78 is inserted is provided with a first insertion hole 92 in the other side surface of the frame body 91.
A second guide groove 91b is formed over the entire length in the hole direction of the connecting screw 88, and the entire length of the second insertion hole 93 in the hole direction is formed on the lower surface of the frame body 91.

Rollers 95a are provided at both ends and the center of the first and second insertion holes 92 and 93 of the intermediate wall of the frame body 91 for separating the first and second insertion holes 92 and 93 from each other.
The first and second insertion holes 92 and 93 are rotatably mounted around an axis 96 a orthogonal to the hole direction of the first and second insertion holes 92 and 93 so that the peripheral surface is exposed in the first and second insertion holes 92 and 93. Further, the roller 95 b is connected to the first insertion hole 92 of the frame body 91.
Is mounted rotatably around an axis 96b orthogonal to the hole direction of the first insertion hole 92 so as to face each roller 95a. Further, a roller 95c is rotatably mounted below the second insertion hole 93 of the frame body 91 so as to be rotatable around an axis 96c orthogonal to the hole direction of the second insertion hole 93 so as to face each roller 95a. .

A notch 97 into which the hanging bolt 2 is inserted is formed at the center of the mounting piece 94, and a hanging bolt gripping part 98 is mounted on the lower surface of the mounting piece 94 so as to coincide with the notch 97. The hanging bolt gripping portion 98 includes a fixed nut portion 98a fixed to the lower surface of the mounting piece 94 and a movable nut portion 98 rotatably mounted on the fixed nut portion 98a.
b and the operating lever 9 extended from the movable nut portion 98b
8c. Also, the fixing nut portion 98a
The movable nut portion 98b is formed with a half circumference thread groove. A first fastening screw 99a is screwed to one side surface of the frame body 91 so as to extend into the first insertion hole 92, and a second fastening screw 99b is screwed to one side surface of the frame body 91 in the second insertion hole 93. It is screwed to extend inside.

26 to 28, the drill mounting body 100 has a dust collecting portion 101 formed at an upper portion, and a drill mounting portion 102 is separated from the dust collecting portion 101 by a partition wall 103 so that the lower portion of the dust collecting portion 101 can be separated. And the upper structural material 7
1 is connected to the dust collecting unit 101 and the dust collecting unit 1
01 is formed on one side. Then, a fixing thumb screw 105 is screwed to the lower surface of the fitting portion 104. Further, a T-shaped rail 106 is provided on two opposing inner wall surfaces of the drill mounting portion 102 and extends vertically. The U-shaped drill mounting frame 107 is formed such that the U-shaped slider 108 matches the groove direction of the U-shape with the length direction of the drill mounting frame 107, and the outer wall surfaces of the opposite sides of the drill mounting frame 107. Attached to. And the drill mounting frame 107
Are arranged in the drill mounting portion 102 so that the slider 108 can be fitted to the rail 106 and slidable in the vertical direction. Further, the drill 30 is fixed to the drill mounting frame 107 by using a mounting bracket 109, and the drill blade 30 a faces in the vertical direction, and penetrates the partition wall 103, and the dust collecting portion 10 is formed.
It extends into one.

[0078] The air cylinder 110 is
2, the piston 110 a is connected to the drill mounting frame 107 by a mounting bracket 111. The other end of the upper structural member 71 is closed, and the dust collecting hose 11 is closed.
2 is attached to the other end of the upper structural member 17.
The first air hose 113 is inserted from the other end of the upper structural member 71 and extends to one end of the upper structural member 71. Further, the second air hose 114 is connected to the fitting portion 104.
The other end is connected to the intake port 110b and the exhaust port 110c of the air cylinder 110 by extending from the drill mounting part 102 via the dust collecting part 101. The drill mounting portion 102 is offset with respect to the fitting portion 104 such that the drill blade 30a is shifted by a predetermined amount outside the upper structure member 71 in the arrangement direction of the pair of upper structure members 71.

Next, a cable rack laying method using the first and second aerial moving scaffolds 70 and 81 will be described with reference to FIGS. 29 and 30. First,
Although not shown, a single-pipe scaffold 9 for one span is assembled on the starting end side of the cable rack laying path, and a scaffold plate 10 is placed on the single-pipe scaffold 9 as in the first embodiment. Next, the worker climbs the single pipe scaffold 9 and moves the scaffold plate 10
Ride, 4 holes for anchor on ceiling 7 (for 1 span)
Open. Then, the anchor is driven into each hole, and the suspension bolt 2 is fastened to the anchor. As a result, the two pairs of suspension bolts 2 are suspended from the ceiling 7 as shown in FIG.

Next, the scaffolding support fitting 90 inserts the suspension bolt 2 into the notch 97 so that the mounting piece 94 is directed to the ceiling, and operates the operation lever 98c to rotate the movable nut 98b. As a result, the fixed nut portion 98a and the movable nut portion 98b are fastened and fixed to the suspension bolts 2, and the scaffolding support members 90 are attached to the suspension bolts 2 as shown in FIG. At this time, the scaffold support metal 9
0 is located inside a pair of suspension bolts 2 where the frame body 91 is suspended relative to both sides in the cable rack installation direction,
The first and second insertion holes 92 and 83 are provided so as to match the cable rack installation direction.

Next, the first aerial moving scaffold 70 is lifted on the scaffold plate 10 using the single-tube scaffold 9. And
One upper structural member 71 is inserted into the first insertion hole 92 of the two scaffolding support members 90 disposed on one side of the cable rack installation direction, and the other upper structural member 71 is inserted in the other direction in the cable rack installation direction. The first aerial moving scaffold 70 is hung by the two pairs of hanging bolts 2 by being inserted into the first insertion holes 92 of the two scaffolding support members 90 arranged on the side. Similarly, the second
The aerial moving scaffold 81 is lifted onto the scaffold plate 10 using the single-tube scaffold 9. Then, one lower structural member 82 is inserted into the second insertion hole 93 of the two scaffolding support members 90 arranged on one side in the cable rack installation direction, and the other lower structural member 82 is inserted in the cable rack installation direction. Are inserted into the second insertion holes 93 of the two scaffolding support brackets 90 disposed on the other side of the vehicle, and the second aerial moving scaffold 81 is connected to the two pairs of suspension bolts 2.
Hanged on. Thus, the first aerial moving scaffold 70 is located within the second aerial moving scaffold 81, and the first and second aerial moving scaffolds 70 and 81 are slidably suspended by the two pairs of hanging bolts 2.

Next, the worker rides on the floor plate 75 of the work floor 72 of the first aerial moving scaffold 70 and tightens the second fastening screw 99b of each scaffold support metal fitting 90 so that the lower structural member 82 is attached to the scaffold support metal fitting 90. Fixed to. Thereafter, the worker moves onto the floor plate 86 of the work floor 83 of the second aerial moving scaffold 81,
The first aerial moving scaffold 70 is pushed forward in the cable rack installation direction. As a result, the pair of upper structural members 71
While rotating 5a, 95b, the slide movement is performed within the first insertion hole 92 of the scaffold support metal fitting 90, and the first aerial moving scaffold 70 is moved.
Protrudes for about one span as shown in FIG.

Then, the worker climbs onto the floor plate 75 and fastens the first fastening screw 99a of each scaffold support bracket 90 to fix the upper structural member 71 to the scaffold support bracket 90.
Thereafter, the operator holds the drill mounting body 100 and
The second air hose 114 is connected to the joint 115 of the air hose 113, and then the fitting portion 104 is connected to the upper structural material 71.
29, and the fixing thumb screw 105 is tightened, and the drill 30 is turned into a position shown in FIG.
It is attached to one end of a pair of upper structural members 71. Then, the worker moves onto the floor plate 86, turns on the power of the drill 30, drives a suction pump (not shown) connected to the dust collection hose 112, and further compresses (not shown).
To drive air to the first and second air hoses 113,
The air is supplied to the air cylinder 110 via 114. Then, the piston 110a is extended, the slider 108 is guided by the rail 106 and rises, and the drill blade 3 of the drill 30 is moved.
0a hits the ceiling 7 and a pair of anchor holes are drilled. At this time, dust generated by drilling is collected by the dust collecting section 10.
1. It is sucked from the dust collection hose 112 through the fitting portion 104 and the upper structural material 71.

Then, the worker moves on the floor board 75,
The fixing thumb screw 105 is loosened, and the drill mounting body 100 is removed as shown in FIG. Then, the operator loosens the first fastening screw 99a, and then releases the floor plate 8
6, the first aerial moving scaffold 70 is returned 20-30 cm to the rear in the cable rack installation direction, and then moved to the floor plate 75 again to fasten the first fastening screw 99a. Then, the suspension bolts 2 are attached to the holes drilled in the ceiling 7, and the scaffolding support bracket 90 is attached to the pair of suspension bolts 2 at the forefront in the cable rack installation direction. After loosening the first fastening screw 99a, the worker moves onto the floor plate 86 and pushes the first aerial moving scaffold 70 forward by about one span in the cable rack installation direction. Thereby, the first aerial moving scaffold 70
The upper structural member 71 is inserted into the first insertion hole 92 of the pair of foremost scaffold support members 90 in the cable rack installation direction, and as shown in FIG. 30B, the two foremost pairs in the cable rack installation direction. Is suspended from the suspension bolt 2.

Next, the worker climbs on the floor plate 75,
After the first fastening screw 99a is tightened, it moves onto the floor plate 86, where the second fastening screw 99b is loosened, and then moves onto the floor plate 75. Then, the second aerial moving scaffold 81 is pulled forward in the cable rack installation direction. As a result, the pair of lower structural members 82 slide in the second insertion holes 93 of the scaffolding support fittings 90 while rotating the rollers 95a and 95c, and the lower structural members 82 support the foremost pair of scaffolds in the cable rack installation direction. It is inserted into the second insertion hole 93 of the metal fitting 90. Then, the second aerial moving scaffold 81 moves about one span, and is suspended from the two frontmost pairs of suspension bolts 2 in the cable rack laying direction, as shown in FIG.

Next, the worker moves on the floor board 86,
After the second fastening screw 99b is tightened, as shown in FIG. 30 (d), a third pair of L-shaped angles 3 is fixed to the rear from the pair of front suspension bolts 2 in the cable rack installation direction. . Then, as shown in FIG. 19, the holding frame 41 is attached to the L-shaped angle 3, and the scaffolding plate support 47A is attached.

Thereafter, the above operation is repeated, and the first and second aerial moving scaffolds 70 and 81 are alternately moved forward in the cable rack laying direction, and a pair of hanging bolts 2 are hung. Attach to the suspension bolt 2 and further attach the scaffolding plate support 47A to the L-shaped angle 3. During this operation, every time a plurality of scaffold plate support members 47A are installed, the scaffold plate 48 is laid on the scaffold plate support member 47A. Then, the worker gets on the scaffold plate 48 and lays the cable rack 1 on the L-shaped angle 3.

As described above, in the tenth embodiment, the first and second aerial moving scaffolds 70 and 81 are slidably supported by the two pairs of hanging bolts 2 and alternately forward by a predetermined amount in the cable rack installation direction. Since the operation of moving the suspension bolts 2 and the operation of fixing the L-shaped angle 3 are alternately performed, there is no need to install a single pipe scaffolding over the entire length of the cable rack installation path. The same effect as that of No. 1 can be obtained.

According to the tenth embodiment, since the scaffolding support bracket 90 is attached near the ceiling of the suspension bolt 2, the worker and the first and second aerial moving scaffolds 70 and 81 are provided.
Such weights do not easily act on the suspension bolts 2 as bending stress or buckling force, and furthermore, the work floors 72 and 83 are hardly shaken, thereby improving work safety. Furthermore, regardless of the height of the ceiling and the length of the suspension bolt 2, the cable rack can be laid, and excellent versatility can be obtained. In addition, the first and second
Since the work is performed by moving the aerial moving scaffolds 70 and 81 alternately in the cable rack laying direction, the worker can move the floor board 7 on the non-moving side.
5 and 86, aerial moving scaffolds 70 and 81 on the moving side
Can be moved, reducing the workload,
Work safety is improved. Also, handrails 76, 8 are provided on the work floors 72, 83 of the first and second aerial moving scaffolds 70, 81.
Since the gear 7 and the chain 77 are provided, work safety is improved.

Further, the drill 30 is moved to the first aerial moving scaffold 70.
Is attached to one end of the upper structural member 71, and is moved to the second aerial moving scaffold 81, and the drill 30 is remotely driven to perform the drilling. Therefore, only the reaction force due to the drilling is at the forefront in the cable rack installation direction. The first aerial moving scaffold 7 using the scaffolding support metal fitting 90 attached to the suspension bolt 2 as a fulcrum.
0 acts on the foremost part in the cable rack installation direction. Therefore, bending stress and buckling force acting on the suspension bolt 2 are reduced. Further, dust generated by drilling passes through the dust collecting portion 101, the fitting portion 104, and the upper structural material 71,
Since it is sucked from the dust collection hose 112, there is no contamination by dust, and workability is improved.

In the tenth embodiment, the scaffold support bracket 90 in which the first and second insertion holes 92 and 93 are formed.
, The first and second aerial moving scaffolds 70 and 81 are slidably supported. However, the first and second aerial moving scaffolds 70 and 81 are slidably supported by the first and second aerial moving scaffolds 70 and 81. First and second aerial moving scaffolds 70, 81
May be individually slidably supported.

[0092]

Since the present invention is configured as described above, it has the following effects.

According to the present invention, the suspension bolts are suspended from the ceiling in pairs in the rack installation direction at predetermined intervals, and
An L-shaped angle is attached to each pair of the hanging bolts, is horizontally disposed at predetermined intervals in the rack installation direction, and a cable rack is fixed to the L-shaped angle and is installed in the rack installation direction. In the laying method, a step of slidably supporting a pair of beams arranged parallel to each other on the projecting scaffold with respect to at least the two foremost two L-shaped angles in the rack laying direction, and connecting the pair of beams to the rack. Connecting the pair of beams to at least the two foremost L-shaped angles in the rack installation direction after sliding by approximately one span in the installation direction, and a pair of the protruding scaffolds. The pair of suspension bolts is suspended from the ceiling at a position 1 span away from the work floor installed on the side where the beam is extended, in the rack installation direction. And horizontally disposing the L-shaped angle on the pair of suspension bolts, thereby reducing the installation area of the temporary scaffolding installed on the floor, and further releasing the space under the cable rack installation route. In addition, the labor for assembling and disassembling temporary scaffolding can be reduced, construction costs can be reduced, and a cable rack laying method can be obtained that can secure passage for people and vehicles and suppress obstacles to other works. .

Further, after distributing the L-shaped angle for three spans in the rack installation direction, the cable rack is erected on the L-shaped angle for two spans excluding the L-angle at the forefront in the rack installation direction. Since the fixing step is provided, the cable rack can be laid in the air.

Further, since the work floor is located below the pair of beams in the vertical direction, the work space is widened and the work load on the worker is reduced.

A step of extending a scaffold plate supporting member from the L-shaped angle to one side in the rack installation direction in parallel with the L-shaped angle; and erection of a scaffold plate on the scaffold plate supporting material; Since the fixing step is provided, the work of laying the cable rack is simplified, and the work of installing the temporary scaffold when the cable is extended can be greatly reduced.

[0097] Further, since the scaffold plate is positioned vertically below the L-shaped angle, the work space is widened and the work load on the worker is reduced.

Further, prior to the step of horizontally disposing the L-shaped angle at a position one span away from the work floor provided on the projecting side of the pair of beams on the projecting scaffold in the rack installation direction, the buckling is performed. Since the step of sandwiching the prevention member between the projecting side of the pair of beams and the ceiling is provided, work safety on the projecting side of the projecting scaffold can be improved.

In addition, prior to the step of horizontally disposing the L-shaped angle at a position one span away from the work floor provided on the projecting side of the pair of beams on the projecting scaffold and in the rack laying direction, suspending bolts may be provided. Since the step of disposing the opening prevention tool between the hanging bolts adjacent to the rack mounting direction in the front of the rack mounting direction is provided, work safety on the protruding side of the protruding scaffold can be improved.

Further, hanging bolts are suspended from the ceiling at predetermined intervals in the rack installation direction in pairs from the ceiling, and L-shaped angles are attached to each pair of the suspension bolts to horizontally extend at predetermined intervals in the rack installation direction. In a cable rack laying method in which a cable rack is fixed to the L-shaped angle and arranged in the rack laying direction, a first aerial moving scaffold having a work floor erected between a pair of upper structural members is provided. A second aerial moving scaffold having a work floor laid between a pair of lower structural members is attached to a scaffold support bracket attached to the ceiling of each of the two pairs of the hanging bolts in the rack installation direction. And the lower structural material are slidably supported,
Positioning the first aerial moving scaffold in the second aerial moving scaffold and suspending the first aerial moving scaffold on the two pairs of hanging bolts; Moving the pair of the hanging bolts to the ceiling, and suspending the pair of the hanging bolts on the ceiling; and following the hanging bolt hanging step, the scaffold is provided on the ceiling side of the foremost pair of the hanging bolts in the rack installation direction. Subsequent to the scaffold support fitting attaching step of attaching a support fitting, and the scaffold support fitting attaching step, the first aerial moving scaffold is moved forward by about 1 span in the rack installation direction, and the upper structural member is moved to the rack. A first aerial moving scaffold suspending step of slidably supporting the foremost scaffold support in the laying direction and suspending the first aerial moving scaffold on the foremost two pairs of the hanging bolts in the rack laying direction; The above Subsequent to the aerial moving scaffold suspending step, the second aerial moving scaffold is moved forward by about one span in the rack installation direction, and the lower structural member is slid to the foremost scaffold support bracket in the rack installation direction. Freely from the front in the rack installation direction
And an L-shaped angle setting step of horizontally setting the L-shaped angle on the second pair of the suspension bolts, so that the installation area of the temporary scaffold installed on the floor is reduced, and the space under the cable rack installation route is further reduced. A cable rack laying method that frees up labor for assembling and disassembling temporary scaffolds, reducing labor costs, achieving a path for people and vehicles, and suppressing obstacles to other works. can get.

Further, following the L-shaped angle setting step, the scaffold plate supporting member is moved from the third L-shaped angle to the rear in the rack setting direction in the rack mounting direction in parallel with the L-shaped angle. Extending to the side,
And a step of erection of the scaffold plate on the scaffold plate support material, thereby simplifying the cable rack laying work,
The work of installing a temporary scaffold during cable extension can be greatly reduced.

Further, since the scaffold is located vertically below the L-shaped angle, the work space is widened and the work load on the worker is reduced.

In the hanging bolt suspending step, a drill is attached to the tip of the upper structural member, and the drill is remotely driven from the work floor of the second aerial moving scaffold to drill holes for hanging bolts on the ceiling. Since it is performed, the load of the worker is not applied to the first aerial moving scaffold at the time of drilling, and the bending stress and the buckling force acting on the suspension bolt at the time of drilling are reduced.

Further, since dust generated at the time of drilling is removed by suction, contamination by dust is prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a protruding state of a protruding scaffold in a cable rack laying method according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a fixing fitting applied to the cable rack laying method according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a method for fixing a protruding scaffold in the cable rack laying method according to the first embodiment of the present invention.

FIG. 4 is a process diagram illustrating a cable rack laying method according to the first embodiment of the present invention.

FIG. 5 is a process diagram illustrating a cable rack laying method according to the first embodiment of the present invention.

FIG. 6 is a perspective view showing a protruding state of a protruding scaffold in a cable rack laying method according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a protruding state of a protruding scaffold in a cable rack laying method according to a third embodiment of the present invention.

FIG. 8 is a perspective view showing a protruding state of a protruding scaffold in a cable rack laying method according to a fourth embodiment of the present invention.

FIG. 9 is an exploded perspective view showing a temporary scaffold applied to a cable rack laying method according to Embodiment 4 of the present invention.

FIG. 10 is a side view showing a state in which a holding frame of a temporary scaffold applied to a cable rack laying method according to a fourth embodiment of the present invention is attached to an L-shaped angle.

FIG. 11 is a side view of relevant parts for explaining a cable rack laying method according to Embodiment 5 of the present invention.

FIG. 12 is a perspective view showing a protruding state of a protruding scaffold in a cable rack laying method according to a sixth embodiment of the present invention.

FIG. 13 is a fragmentary cross-sectional view showing a beam fixing state of a protruding scaffold in a cable rack laying method according to Embodiment 7 of the present invention.

14 is a sectional view taken along the line XIV-XIV in FIG.

FIG. 15 is a perspective view of relevant parts showing a beam fixing state of a protruding scaffold in a cable rack laying method according to Embodiment 8 of the present invention.

FIG. 16 is a fragmentary cross-sectional view showing a beam-fixed state of a protruding scaffold in a cable rack laying method according to Embodiment 8 of the present invention.

FIG. 17 is an exploded perspective view showing a beam fixing bracket of a protruding scaffold in a cable rack laying method according to Embodiment 8 of the present invention.

FIG. 18 is a perspective view showing a protruding state of a protruding scaffold in a cable rack laying method according to a ninth embodiment of the present invention.

FIG. 19 is an essential part perspective view for explaining a method of temporarily installing a scaffold plate in a cable rack laying method according to Embodiment 9 of the present invention;

FIG. 20 is a perspective view showing a hanging bolt opening prevention tool applied to the cable rack laying method according to Embodiment 9 of the present invention.

FIG. 21 is a perspective view showing a first aerial moving scaffold in a cable rack laying method according to Embodiment 10 of the present invention.

FIG. 22 is a perspective view showing a second aerial moving scaffold in the cable rack laying method according to the tenth embodiment of the present invention.

FIG. 23 is a perspective view showing a scaffold support in a cable rack laying method according to Embodiment 10 of the present invention.

FIG. 24 is a perspective view showing a scaffold support in a cable rack laying method according to Embodiment 10 of the present invention.

FIG. 25 is a partially cutaway sectional view for explaining a scaffold mounting state in a cable rack laying method according to Embodiment 10 of the present invention.

FIG. 26 is a perspective view illustrating a drill mounting state in a cable rack laying method according to Embodiment 10 of the present invention.

FIG. 27 is an exploded perspective view illustrating a drill mounting state in a cable rack laying method according to Embodiment 10 of the present invention.

FIG. 28 is a top view illustrating a drill mounting state in the cable rack laying method according to Embodiment 10 of the present invention.

FIG. 29 is a process diagram illustrating a cable rack laying method according to Embodiment 10 of the present invention.

FIG. 30 is a process diagram illustrating a cable rack laying method according to Embodiment 10 of the present invention.

FIG. 31 is a perspective view showing an installed state of a cable rack.

FIG. 32 is a view illustrating a conventional cable rack laying method.

[Explanation of symbols]

1 cable rack, 2 hanging bolts, 3 L-angle, 20 and 20 A projecting scaffold, 21 and 21 A beam, 23 and 23 A work floor, 25 and 33 fixing bracket, 3
0 drill, 47, 47A scaffold plate support material, 48 scaffold plate, 50 buckling prevention jack (buckling prevention member), 6
0 Support member, 63 Hanging bolt opening prevention tool, 70
1st aerial moving scaffold, 71 upper structural material, 72 work floor, 81 2nd aerial moving scaffold, 82 lower structural material, 83
Work floor, 90 Scaffold support.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Joji Hayashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Kenji Hatsuda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. F-term (reference) 5G357 BA04 BB01 BC01

Claims (12)

[Claims] 1. A hanging bolt is suspended from a ceiling at predetermined intervals in a rack installation direction from a ceiling, and an L-shaped angle is attached to each pair of the hanging bolts to horizontally extend at predetermined intervals in the rack installation direction. In a cable rack laying method in which the cable rack is fixed to the L-shaped angle and is arranged in the rack laying direction, a pair of beams arranged in parallel with each other on the protruding scaffold is arranged at least in the front of the rack laying direction. Slidably supporting the two L-shaped angles, and sliding the pair of beams in the rack installation direction so as to protrude for approximately one span. A step of coupling to at least the two foremost L-shaped angles in the laying direction, and an operation erected on the projecting side of the pair of beams of the projecting scaffold. Suspending the pair of suspension bolts from the ceiling at a position one span away from the floor in the rack laying direction, and horizontally disposing the L-shaped angle on the pair of suspension bolts. Characteristic cable rack laying method. 2. After distributing the L-shaped angle in the rack installation direction for three spans, the cable rack is erected on the L-shaped angle for two spans excluding the L-angle at the forefront in the rack installation direction. The method for laying a cable rack according to claim 1, further comprising a fixing step. 3. The method of laying a cable rack according to claim 1, wherein the work floor is positioned vertically below the pair of beams. 4. A step of extending a scaffold plate support member from the L-shaped angle to one side of the rack laying direction in parallel with the L-shaped angle, erection of a scaffold plate on the scaffold plate support material, The method for laying a cable rack according to any one of claims 1 to 3, further comprising a fixing step. 5. The method of laying a cable rack according to claim 4, wherein the scaffolding plate is located vertically below the L-shaped angle. 6. A buckling process prior to the step of horizontally disposing the L-shaped angle at a position one span away from the work floor provided on the projecting side of the pair of beams of the projecting scaffold in the rack installation direction. The method of laying a cable rack according to any one of claims 1 to 5, further comprising: a step of sandwiching the prevention member between a projecting side of the pair of beams and a ceiling. 7. A hanging bolt prior to the step of horizontally disposing the L-shaped angle at a position one span away from the work floor installed on the projecting side of the pair of beams of the projecting scaffold in the rack installation direction. The cable rack according to any one of claims 1 to 5, further comprising a step of disposing an opening prevention tool between the hanging bolts adjacent to the rack installation direction in the foremost rack installation direction. Laying method. 8. A hanging bolt is suspended from the ceiling at predetermined intervals in a rack installation direction from the ceiling in pairs, and an L-shaped angle is attached to each pair of the hanging bolts to horizontally extend at predetermined intervals in the rack installation direction. A cable rack laying method in which a cable rack is fixed to the L-shaped angle and disposed in a rack laying direction, wherein a work floor is erected between a pair of upper structural members. A second aerial moving scaffold having a work floor laid between a pair of lower structural members is attached to a scaffold support bracket attached to a ceiling side of each of the two pairs of hanging bolts in the rack installation direction. And the lower structural member is slidably supported, and the first aerial moving scaffold is positioned in the second aerial moving scaffold, and is suspended from two pairs of the hanging bolts. About scaffold A hanging bolt suspending step of moving a pair of the suspending bolts to the ceiling by moving the rack forward by the span by the span, and following the suspending bolt suspending step, a pair of foremost suspenders in the rack installing direction. A scaffold support fitting attaching step of attaching the scaffold supporting fixture to the ceiling side of the bolt, and following the scaffold supporting fixture attaching step, the first aerial moving scaffold is moved forward by about 1 span in the rack installation direction, A first aerial in which the upper structural member is slidably supported by the scaffold support metal at the forefront in the rack laying direction, and the first aerial moving scaffold is hung by two foremost hanging bolts in the rack laying direction; Following the moving scaffold suspension step and the first aerial moving scaffold suspension step, the second
The aerial moving scaffold is moved forward by about 1 span in the rack installation direction to allow the lower structural material to be slidably supported by the foremost scaffold support in the rack installation direction, and then from the front in the rack installation direction. An L-shaped angle setting step of horizontally setting an L-shaped angle on the third pair of hanging bolts at the rear. 9. Following the L-shaped angle setting step, a scaffold plate support member is moved from the third L-shaped angle to the rear in the rack mounting direction in the rack mounting direction in parallel with the L-shaped angle. The method of laying a cable rack according to claim 8, further comprising: a step of extending to a side portion; and a step of erection of a scaffold plate on the scaffold plate support member. 10. The method of laying a cable rack according to claim 9, wherein said scaffolding plate is located vertically below said L-shaped angle. 11. In the hanging bolt hanging step, a drill is attached to a tip of the upper structural member, and the drill is remotely driven from a work floor of the second aerial moving scaffold to form a hole for hanging bolt mounting on the ceiling. 9. The method of laying a cable rack according to claim 8, wherein the cable rack is laid. 12. The method of laying a cable rack according to claim 11, wherein dust generated at the time of drilling is removed by suction.