Cable rack vertical support frame unit drop-in construction method

Abstract

Even if the vertical spacing between adjacent floors in a structure differs, cable racks can be lowered from the upper floor and their upper ends can be easily secured on the upper floor. [Solution] Multiple cable racks 1 and quadrilateral support frames 2 are prepared, openings 5 ​​are made at the same position on the floor 4 of each floor, cylindrical through frames 6 are made to surround each opening 5, the cable racks 1 and support frames 2 are partially overlapped and connected to assemble a unit 7, the unit 7 with the cable rack 1 on the bottom and the support frame 2 on the top is suspended from above and passed through the through frames 6 on the upper and lower adjacent floors, the lower part of each unit 7 is lowered to the floor below, the locking fittings 3 provided on both sides of the upper end of each support frame 2 are overlapped with the locking projections 6b of each through frame 6 and bolted in place, and a separate unit 7' is connected to the cable rack 1 of the unit 7 on the lower adjacent floor.

Description

Technical Field

[0001] The present invention relates to a method for installing a cable rack that supports power cables, communication cables, etc. for supplying power to equipment on each floor of a structure such as a building or a factory, through each floor at a construction site, and relates to a method of dropping a cable rack vertical support base unit that eliminates high-altitude work.

Background Art

[0002] At a construction site of a structure such as a building or a factory, it is necessary to lay cables such as power cables and communication cables from an electrical room to supply power to equipment on each floor. Therefore, when laying the above cables on each floor, the cable rack is installed vertically in a narrow space of an electrical dedicated shaft called EPS, and the above cables are laid.

[0003] When constructing this cable rack, it is basically necessary to provide support for each floor within a vertical support interval range of 6 m. However, depending on the form of the building, the intervals between floors vary, and there are cases where the interval exceeds 6 m, and in that case, intermediate support is required.

[0004] For this reason, a support base is connected to one end of the cable rack and unitized. However, if the support base is installed at a low position on each floor in a narrow EPS, it will interfere with the installation of the distribution board, etc., so the support base is attached from the ceiling surface. However, the attachment of the support base to the ceiling surface is high-altitude work, and since it is work for handling heavy objects at high altitude, there is a risk of danger.

[0005] In reality, when fixing the support frame to the ceiling, anchors are driven in to secure it, but this process of inserting liners and adjusting the level is time-consuming because the liners are repeatedly attached and removed. Furthermore, this work is performed at a height, with workers in awkward positions, looking upwards and reaching their arms. Moreover, since the support frame parts are suspended and assembled at a height, the support frame is prone to distortion. To address these issues, measures have been taken to eliminate the need for working at heights when installing cable racks, allowing for safe work at the floor level of each floor.

[0006] Patent Document 1 describes a method developed to solve the above-mentioned problems. It involves preparing the required number of cable racks in advance, each with the same length as the distance between the floors of adjacent floors. Each cable rack is lowered through an opening in the floor of the adjacent upper floor, and its upper end is fixed to the lower part of a mounting bracket fixed to the formwork on the opposing sides of the opening. The lower end of the cable rack is fixed to the upper part of a mounting bracket fixed to the formwork on the opposing sides of the opening in the floor of the adjacent lower floor. In this way, the upper and lower ends of each cable rack are fixed to mounting brackets fixed to the formwork on the opposing sides of the opening in the floor of each floor.

[0007] According to this construction method, cable racks are lowered to the floor below through openings in the floors of adjacent floors, the upper end of the cable rack is fixed to a mounting bracket fixed to the formwork of the opening, and the lower end of the cable rack is fixed to a mounting bracket in the opening of the adjacent lower floor. As a result, the conventional work of fixing cable racks to the ceiling surface of the floor below is eliminated, work at height is eliminated, and the safety of the work is improved. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2012-95396 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0009] However, the method described in Patent Document 1 is only applicable to structures such as buildings where the vertical spacing of each floor is uniform. It cannot be used in structures where the vertical spacing of each floor is different.

[0010] Therefore, in order to solve the above-mentioned problems, this invention aims to provide a cable rack vertical support frame unit drop-in method that allows cable racks to be lowered from the upper floor and their upper ends to be easily fixed on the upper floor, even when the vertical spacing between adjacent floors in a building or other structure is different. [Means for solving the problem]

[0011] The invention of claim 1 is a construction method for laying cable racks to support power cables, communication cables, etc., from the upper floor to the lower floor of a structure, wherein multiple ladder-shaped cable racks of a certain length and quadrilateral frame-shaped support frames with a width greater than the width of the cable racks are prepared, openings are made at the same position on the floor of each floor, cylindrical through frames are made to surround each opening, the cable racks and support frames are partially overlapped and connected to assemble a unit, and the unit with the cable racks on the bottom and the support frames on top is suspended from above and adjacent to the above and below. The lower part of each unit is lowered to the lower floor through the through-frames on each of the upper and lower floors, and the locking fittings provided on both sides of the upper end of each support frame are bolted onto the locking projections of each through-frame. On the lower floor adjacent to the upper and lower floors, the locking fittings of the support frame of a separate unit which is the inverted version of the unit, or only the support frame with the locking fittings at its lower end, are fixed at the through-frame location on that lower floor, and the lower end of the cable rack hanging down from the upper floor is connected to the cable rack or the upper part of the support frame of the separate unit, thus forming a cable rack vertical support frame unit drop-in construction method.

[0012] The invention of claim 2 is a construction method for laying cable racks to support power cables, communication cables, etc., from the upper floor to the lower floor of a structure, wherein multiple ladder-shaped cable racks of a certain length and quadrilateral frame-shaped support frames with a width greater than the width of the cable racks are prepared, openings are made at the same position on the floor of each floor, cylindrical through frames are made to surround each opening, the cable racks and support frames are partially overlapped and connected to assemble a unit, the unit with the cable rack on the bottom and the support frame on top is suspended from above and the cables are passed through the through frames on the upper and lower adjacent floors, and the cables of each unit The lower part is lowered to the floor below, and the locking fittings provided on both sides of the upper end of each support frame are overlapped with the locking projections of each through frame and bolted in place. On the floor below, which is adjacent to the floor above and below, the cable rack of a separate unit is placed on the upper side and the support frame on the lower side, and the locking fittings provided on both sides of the lower end of the support frame are overlapped with the locking fittings of the support frame, which are bolted to the through frame of each cable duct opening, and bolted in place to erect the unit. The upper end of the cable rack on the upper part of the support frame or the upper end of the support frame is connected and fixed to the lower end of the cable rack of the unit lowered from each of the floors above, thus creating a cable rack vertical support frame unit drop-in construction method.

[0013] The invention of claim 3 is a cable rack vertical support frame unit drop-in method according to claim 1 or 2, wherein the through frame is embedded in the floor around the opening at the bottom and raised above the floor surface at the top. [Effects of the Invention]

[0014] According to each of the inventions in claims 1 to 3, a unit is assembled by connecting a cable rack and a support frame, and the unit is suspended from an adjacent upper floor through a through-frame in an opening, with the cable rack facing downwards. The upper end of the support frame of the unit is then locked to the through-frame. Therefore, the work is performed at the through-frame location on the floor in question. Furthermore, the work of connecting the support frame or the upper end of the cable rack to the cable rack lowered from the upper floor can be done on the floor surface or on a stepladder on each floor, making the work easy. There is no need to fix the upper end of the support frame to the ceiling surface of each floor as in the conventional method. In other words, workers do not need to stand on the frame and work overhead in an upward position. This reduces the workload on workers and improves work safety.

[0015] Furthermore, even if the spacing between adjacent floors differs vertically, the length of the cable rack and the unit consisting of the cable rack can be easily adjusted, and by making such adjustments, it is possible to install the cable rack throughout each floor.

[0016] Furthermore, according to the invention of claim 3 in particular, since the lower half of the through-frame provided on the inner circumference of the opening provided on the floor surface of each floor is embedded in the concrete forming the floor, the strength is high, and support frames and cable racks that fix locking fittings to the through-frame can be stably supported and fixed. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic cross-sectional view showing the installation of cable racks and support frames between adjacent floors using the cable rack vertical support frame unit drop-in method of Embodiment Example 1 of this invention. [Figure 2] This is a perspective view of the cable rack and support frame used in the cable rack vertical support frame unit drop-in construction method according to Embodiment Example 1 of this invention. [Figure 3] This is a perspective view of the through-frame used in the cable rack vertical support frame unit drop-in construction method according to Embodiment Example 1 of this invention. [Figure 4]It is a plan view of a through-frame used in the method of dropping a cable rack vertical support base unit in Embodiment Example 1 of the present invention. [Figure 5] It is a longitudinal sectional view in the usage state of a through-frame used in the method of dropping a cable rack vertical support base unit in Embodiment Example 1 of the present invention. [Figure 6] It is a perspective view of a unit combining a cable rack and a support base in the method of dropping a cable rack vertical support base unit in Embodiment Example 1 of the present invention. [Figure 7] It is a perspective view of a unit composed of a cable rack and a support base in the method of dropping a cable rack vertical support base unit in Embodiment Example 1 of the present invention, suspended above a through-frame. [Figure 8] It is a perspective view showing a state where the upper end of the unit is locked to the through-frame by passing the unit through the through-frame in the method of dropping a cable rack vertical support base unit in Embodiment Example 1 of the present invention. [Figure 9] It is a sectional view of a state where the upper end of the unit is locked to the through-frame by passing the unit through a through-hole in the method of dropping a cable rack vertical support base unit in Embodiment Example 1 of the present invention. [Figure 10] It is a schematic sectional view of a state where the upper end of the unit is locked to the through-frame by passing the unit through through-holes on each floor and dropping the unit to the lower floor in the method of dropping a cable rack vertical support base unit in Embodiment Example 1 of the present invention. [Figure 11] It is a front view of a separate unit connecting between a cable rack hanging down from the upper floor adjacent vertically above and a through-frame on the lower floor in the method of dropping a cable rack vertical support base unit in Embodiment Example 2 of the present invention.

Embodiments for Carrying out the Invention

[0018] (Embodiment Example 1) The method of dropping a cable rack vertical support base unit in Embodiment Example 1 of the present invention will be described based on FIGS. 1 to 11.

[0019] In this cable rack vertical support frame unit drop-in construction method, first, as shown in Figure 2, multiple support frames 2 are prepared, each consisting of a ladder-shaped cable rack 1 of a certain length and a four-sided frame shorter than the length of the cable rack 1 but slightly wider than the cable rack 1. When the cable racks 1 are stacked, the support frames 2 are sized and shaped so that both sides of a portion of the cable rack 1 fit snugly inside the main columns 2a on both sides of the support frames 2. In addition, locking fittings 3 made of channel members are attached to the upper ends of the main columns 2a on both sides of the support frames 2, with their central parts fixed to the ends of the main columns 2a and their openings facing outwards, parallel to each other.

[0020] Furthermore, this construction method involves laying cable racks to support power cables, communication cables, etc., from the upper floors to the lower floors of the structure, and openings 5 ​​that penetrate the floors 4 are provided at the same location on the floors 4 of each upper and lower floor.

[0021] Figures 3 and 4 show a through frame 6 fitted to the inner circumference of the opening 5. The through frame 6 has an elongated quadrilateral shape, with an outer edge 6a that is bent outward at the upper and lower openings, and a U-shaped locking projection 6b at the top of each of the four corners. As shown in Figure 5, the through frame 6 is installed on the inner circumference of the opening 5, with its upper part above the floor surface 4a and its lower part embedded in the floor 4.

[0022] Then, as shown in Figure 6, the cable rack 1 and the support frame 2 are overlapped with a slight offset so that the lower part of the cable rack 1 protrudes below the support frame 2, and these are fixed in this state to form unit 7. As shown in Figure 7, this unit 7 is suspended from above by a suspension rope 8 and passed through the through frame 6 of the floor 4, and lowered to the next floor. As shown in Figures 8 and 9, the locking fittings 3 at the upper ends of both sides of the support frame 2 of unit 7 are placed on the locking projections 6b of the through frame 6, and these are bolted together.

[0023] Similarly to the above, as shown in Figure 10, a unit 7 is suspended from the through frame 6 on each floor, the cable rack 1 of each unit 7 is lowered to the floor below, and the locking fitting 3 at the upper end of the support frame 2 of the unit 7 is placed on the locking projection 6b of each through frame 6 and secured with bolts.

[0024] Subsequently, as shown in Figure 1, unit 7 is connected between the lower end of the cable rack 1 hanging from the upper floor and the through frame 6 of the floor 4 on that floor. At this time, the length from the lower end of the cable rack 1 to the upper edge of the through frame 6 is measured, and a new unit 7' is assembled by connecting and fixing the cable rack 1 and the support frame 2 to match this length, as shown in Figure 11.

[0025] Then, with the cable rack 1 on top and the support frame 2 on the bottom, the locking fittings 3 on both sides of the lower end of the support frame 2 are placed on the locking projections 6b at the upper end of the through frame 6 and bolted down, and then the upper end of the support frame 2 is connected and fixed to the lower end of the cable rack 1 hanging down from the upper floor. In this way, the units 7 are installed sequentially from the upper floors downwards, connecting the cable racks 1 through each floor.

[0026] In the above embodiment example 1, units 7 and 7', which are combinations of cable racks 1 and support frames 2, were provided between each of the vertically adjacent floors. However, depending on the spacing between the floors, unit 7' may be unnecessary, and the connection may be made using only the cable racks 1 or support frames 2 with locking fittings 3 at their lower ends. [Explanation of Symbols]

[0027] 1. Cable rack 2. Support frame 2a Main post 3 Locking fitting 4 floor 4a floor surface 5. Opening 6. Through frame 6a Outer edge 6b Locking projection 7 units 7' units 8. Suspension ropes

Claims

1. In a construction method for laying cable racks that support power cables, communication cables, etc., from the upper floors to the lower floors of a structure, Multiple ladder-shaped cable racks of a certain length and multiple quadrilateral frame-shaped support frames with a width greater than the width of the cable racks are prepared, openings are made at the same positions on the floor of each level, and cylindrical through frames are provided to surround each of these openings. The cable rack and the support frame are partially overlapped and connected to assemble the unit, the unit with the cable rack on the bottom and the support frame on top is suspended from above and passed through the through frames of the adjacent upper and lower floors, the lower part of each unit is lowered to the floor below, and the locking fittings provided on both sides of the upper end of each support frame are overlapped with the locking projections of each through frame and bolted in place. A cable rack vertical support frame unit drop-in method characterized by fixing the locking fitting of the support frame of a separate unit that is upside down, or the locking fitting of a support frame with the locking fitting at its lower end, at the penetration frame location of the lower floor, and connecting the lower end of the cable rack hanging down from the upper floor to the cable rack or upper part of the support frame of the separate unit.

2. In a construction method for laying cable racks that support power cables, communication cables, etc., from the upper floors to the lower floors of a structure, Multiple ladder-shaped cable racks of a certain length and multiple quadrilateral frame-shaped support frames with a width greater than the width of the cable racks are prepared, openings are made at the same positions on the floor of each level, and cylindrical through frames are provided to surround each of these openings. The cable rack and the support frame are partially overlapped and connected to assemble the unit, the unit with the cable rack on the bottom and the support frame on top is suspended from above and passed through the through frames of the adjacent upper and lower floors, the lower part of each unit is lowered to the floor below, and the locking fittings provided on both sides of the upper end of each support frame are overlapped with the locking projections of each through frame and bolted in place. A cable rack vertical support frame unit drop-in method, characterized in that, on the lower floor adjacent to the upper and lower floors, the cable rack of a separate unit is placed on the upper side and the support frame on the lower side, and the locking fittings provided on both sides of the lower end of the support frame are bolted onto the locking fittings of the support frame, which are bolted to the through-frame of each cable duct opening, to erect the unit, and the upper end of the cable rack on the upper part of the support frame or the upper end of the support frame is connected and fixed to the lower end of the cable rack of the unit lowered from each of the upper floors.

3. The cable rack vertical support frame unit drop-in method according to claim 1, characterized in that the lower part of the through-frame is embedded in the floor surrounding the opening and the upper part is raised above the floor surface.

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