JP7464492B2 - Guide sleeve for electrical cable passing through building walls and electrical cable wiring installation method - Google Patents

Description

The present invention relates to a guide sleeve for guiding electric cables such as power cables and signal cables, and an electric cable wiring construction method using the guide sleeve, and in particular to a guide sleeve and wiring construction method suitable for electric cables that pass through the walls of a building.

For example, electrical cables connected to electrical equipment such as water heaters and outdoor air conditioner units installed outside a building are wired to pass through the exterior wall of the building. A through hole is drilled in the exterior wall and the electrical cable is inserted through it. The gap between the periphery of the through hole and the electrical cable is then sealed with a water-stopping material to stop water entering. There are various types of electrical cables, such as power cables for supplying electricity and signal cables for remote operation. Some electrical equipment requires multiple power cables or multiple signal cables.

Patent Document 1 discloses a method of installing through-wall piping in which a guide sleeve including a flange-shaped base plate and a cylindrical portion is attached to a through-hole in a wall, and a fluid pipe such as an air conditioning pipe is passed through the cylindrical portion.

JP 2013-087823 A

When multiple electric cables must be routed through the wall of a building, it is cumbersome to form a through hole in the wall for each electric cable. When multiple electric cables are bundled and inserted through one through hole, it is not easy to completely seal the gap between the periphery of the through hole and the multiple electric cables in the through hole with a water-stopping material, and the amount of water-stopping material required increases. Even if the guide sleeve of Patent Document 1 is applied, the difficulty of water stoppage and the amount of water-stopping material required increase, just by replacing the through hole in the wall with the cylindrical part of the guide sleeve.
In view of the above circumstances, the present invention aims to provide a guide sleeve that, when wiring one or more electrical cables through the wall of a building, reduces the number of through holes to be drilled in the wall and enables easy waterproofing around the electrical cables with a small amount of water-stopping material after wiring.

In order to solve the above problem, the present invention provides a guide sleeve for guiding one or more electric cables through a wall of a building, comprising:
an annular base plate fixed to a periphery of a through hole formed in the wall;
a cylindrical portion protruding from an inner peripheral edge of the base plate in a direction intersecting the base plate;
A closure plate portion formed in a plate shape intersecting the axis of the cylindrical portion, the peripheral portion of which is continuous with the cylindrical portion,
The blocking plate portion is provided with a plurality of closed ring-shaped easily breakable portions spaced apart from each other, and the outer blocking plate portion of each easily breakable portion and the inner separable portion are connected via the easily breakable portions around the entire circumference of the separable portion.

By using the guide sleeve, regardless of the number of electric cables, only one through hole for passing the guide sleeve needs to be formed in the wall of the building. There is no need to form multiple through holes in the wall of the building for each electric cable. Furthermore, only the necessary ones are selected from the multiple easy-to-break parts of the guide sleeve and broken to pass the electric cable through. The easy-to-break parts that are not used are left as they are without breaking. Therefore, the area of the gap or opening to which the water-stopping material should be applied is reduced, and the amount of water-stopping material to be applied can be reduced. The water-stopping material only needs to be applied to the annular gap between the periphery of the through hole part created by breaking the easy-to-break part and the outer periphery of the electric cable passed through the through hole part, and there is no need to seal the gap between the multiple bundled electric cables, making the application of the water-stopping material easy.
Furthermore, by passing an electric cable through each through hole created by breaking the easily breakable portions, the multiple electric cables can be separated from each other by the distance between the corresponding easily breakable portions, at least in the blocking plate portion, and the edges can be cut.

It is preferable that each of the easily breakable parts is a closed annular groove formed in the blocking plate part, and that the groove does not penetrate the blocking plate part over the entire circumference. This eliminates the need for waterproofing treatment for the easily breakable parts that remain unbroken.

It is preferable that a partition wall separating the first and second easily breakable portions of the plurality of easily breakable portions is provided inside the tubular portion so as to intersect with the blocking plate portion. This makes it possible to prevent as much as possible contact between the electric cable inserted by breaking the first easily breakable portion and the electric cable inserted by breaking the second easily breakable portion inside the guide sleeve.

It is preferable that the blocking plate portion is disposed in the middle of the axial direction of the cylindrical portion, and the protruding end portion of the cylindrical portion protrudes beyond the blocking plate portion. This allows an insertion allowance for the covering tube of the electric cable or the like to be provided at least by the distance from the blocking plate portion to the protruding end portion of the cylindrical portion.

The method of the present invention is an electrical cable wiring construction method for wiring one or more electrical cables through a wall of a building using the above-mentioned guide sleeve, comprising the steps of:
The guide sleeve is placed in a through hole formed in the wall;
Before or after the installation, one or more of the easily breakable portions are selected from the plurality of easily breakable portions in the guide sleeve, and the selected easily breakable portion is broken to separate and remove the inner separable portion from the guide sleeve, thereby forming a through hole portion having a periphery around the selected easily breakable portion;
The electric cable is inserted through the through hole.
The present invention is characterized in that a water-stopping material is provided between the periphery of the through hole and the guide sleeve, and between the periphery of the through hole portion and the electric cable.

According to the present invention, when wiring one or more electrical cables through the wall of a building, fewer through holes need to be drilled in the wall, and after wiring, water can be easily sealed around the electrical cables with a small amount of water-stopping material.

FIG. 1 is a front view of a guide sleeve according to a first embodiment of the present invention. Fig. 2(a) is a plan sectional view taken along the line IIa-IIa in Fig. 1. Fig. 2(b) is an enlarged sectional view of a circled portion IIb in Fig. 2(a). FIG. 3 is a perspective view of the guide sleeve as viewed from the front and below. FIG. 4 is a front view taken along line IV-IV in FIG. 5, showing the exterior wall of the building on which the guide sleeve is installed before the waterproofing material is applied. FIG. 5 is a side cross-sectional view of the exterior wall after construction. FIG. 6 is a front view of a guide sleeve according to a second embodiment of the present invention. FIG. 7 is a stepwise sectional view of the guide sleeve according to the second embodiment taken along the bend line VII-VII in FIG. FIG. 8 is a perspective view of the guide sleeve according to the second embodiment. FIG. 9 is a cross-sectional view of an exterior wall of a building, showing an application example of the guide sleeve according to the second embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First Embodiment

FIG. 5 shows, for example, an exterior wall 1 (wall) near an outdoor water heater (not shown) in a building. A through hole 2 is formed in the exterior wall 1. One or more electric cables 3 for the water heater are passed through the through hole 2. In detail, the exterior wall 1 includes a structural plywood 1a (wall body), an indoor wall 1b on the indoor side sandwiching the structural plywood 1a, and a siding 1c (exterior wall) on the outdoor side. Hole portions 2a and 2c constituting the through hole 2 are formed through the structural plywood 1a and the siding 1c, respectively. A waterproof outlet 4 is provided on the outer surface of the siding 1c so as to cover the hole portion 2c.
A waterproof sheet 5 is attached to the surface of the structural plywood 1a facing the outdoors (the left side surface in FIG. 5).

As shown in Fig. 5, the electric cable 3 includes a low-voltage signal cable 3a and a high-voltage power cable 3b. The signal cable 3a is housed in a sleeve pipe 3d such as a CD pipe. Although not shown, the indoor end of the signal cable 3a is connected to a remote control panel in the bathroom or kitchen. There may be only one signal cable 3a, or there may be two (multiple) signal cables, one for the bathroom and one for the kitchen.
When there is no particular distinction between the types of cables 3a and 3b, they are referred to as "electrical cables 3." Each electric cable 3 (3a, 3b) passes between the structural plywood 1a and the interior wall 1b, passes through a through hole 2, and is connected to a waterproof outlet 4. Although detailed illustration is omitted, the water heater is electrically connected to the waterproof outlet 4.

4 and 5, a guide sleeve 10 for guiding these electric cables 3 is provided in the through hole 2 of the outer wall 1. The material of the guide sleeve 10 is not particularly limited, but is preferably an insulating material such as resin. More preferably, the material of the guide sleeve 10 is ABS resin, but is not limited thereto and may be polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), etc.
Preferably, the guide sleeve 10 is made by injection molding of resin.

As shown in Figures 1 to 3, the guide sleeve 10 has a base plate 11, a cylindrical portion 20, and a closing plate portion (lid plate portion) 30, which are integral with each other. The base plate 11 has an outer shape that is, for example, rectangular, and is an annular plate having a circular hole 12 in the center. Screw holes 13 are formed in the four corners of the base plate 11.

The tube portion 20 is formed in a cylindrical shape. The tube portion 20 protrudes from the base plate 11 to the outdoor side (lower side in FIG. 2(a) and left side in FIG. 3). The inner peripheral surface of the tube portion 20 is flush with the inner peripheral edge of the circular hole 12 of the base plate 11. As shown in FIG. 5, the axis L ₂₀ of the tube portion 20 is inclined slightly downward toward the outdoor side (left side in FIG. 5). This provides a drainage gradient to the lower portion of the inner peripheral surface of the tube portion 20. The drainage gradient is preferably 1° or less. As shown in FIG. 3, a drainage hole 22 is formed through the lower portion of the tube portion 20. The drainage hole 22 extends along the axis L ₂₀ of the tube portion 20 from the corner portion with the closing plate portion 30 described later to near the base plate 11.

As shown in Figures 1 to 3, a blocking plate portion 30 is provided on the protruding end portion 21 of the tubular portion 20 facing the outdoors. The blocking plate portion 30 is formed in a plate shape that intersects with the axis _L20 of the tubular portion 20. The peripheral edge portion of the blocking plate portion 30 is connected to the protruding end portion 21 of the tubular portion 20. The blocking plate portion 30 blocks the protruding end portion 21 of the tubular portion 20. Strictly speaking, in the guide sleeve 10 when not in use or in a default state before use, the protruding end portion 21 of the tubular portion 20 is blocked by the blocking plate portion 30 except for the drainage hole 22.
In the following description of the closure plate portion 30, unless otherwise specified, it is assumed that the guide sleeve 10 is in a default state before use or before it is used.

As shown in FIG. 1, the closure plate portion 30 has, for example, three (multiple) easily breakable portions 31, 31, 32 spaced apart from one another. Each easily breakable portion 31, 32 is formed in a closed ring shape. For example, the two first easily breakable portions 31 are relatively large and circular. The second easily breakable portion 32 is formed in a relatively small rectangular shape (square). The closure plate portion 30 can be easily broken at the easily breakable portions 31, 32. The inside of each easily breakable portion 31, 32 forms a detachable portion 33 that is separated from the closure plate portion 30 by breaking the easily breakable portion 31, 32.

As shown in FIG. 2(a), specifically, each of the easily breakable portions 31, 32 is a relatively deep groove 35 in a closed ring shape formed on the front surface 30a (surface facing the outdoors) of the closure plate portion 30. As shown in FIG. 2(b), the depth t ₃₅ of the groove 35 is preferably half or more of the thickness t ₃₀ of the closure plate portion 30, and more preferably about 70% to 90% of the thickness t ₃₀ of the closure plate portion 30. The cross-sectional shape of the groove 35 is, for example, a right-angled triangle having a vertical surface 35a and a slant surface 35b. The vertical surface 35a constitutes the groove side surface on the outer periphery side of the annular groove 35. The slant surface 35a constitutes the groove side surface on the inner periphery side of the annular groove 35. The angle φ ₃₅ (FIG. 2(a)) between the vertical surface 35a and the slant surface 35b is preferably about φ ₃₅ = 20° to 40°, and more preferably about φ ₃₅ = 30°.
The cross-sectional shape of the groove 35 is not limited to a right-angled triangle, but may be another triangular shape such as an isosceles triangle, or may be a semicircular shape.

The groove 35 does not reach the rear surface 30b (the surface facing the internal space of the tube portion 20) of the closure plate portion 30 along its entire circumference. Therefore, the closure plate portion 39 on the outside of each easily breakable portion 31, 32 of the closure plate portion 30 and the separable portion 33 are connected via the easily breakable portions 31, 32 along the entire circumference of the separable portion 33.

As shown in Figures 4 and 5, the guide sleeve 10 in use is disposed between the structural plywood 1a and the siding 1c of the exterior wall 1. The base plate 11 is disposed around the hole portion 2a on the exterior side of the structural plywood 1a. The base plate 11 is fixed to the structural plywood 1a by driving the screws 19 through the screw holes 13 into the structural plywood 1a. Thus, the guide sleeve 10 is fixed to the exterior wall 1.
The circular hole 12 overlaps with the hole portion 2a. The internal space of the cylindrical portion 20 communicates with the hole portion 2a through the circular hole 12.
The drainage holes 22 face downward. The inside of the tube portion 20 is connected through the drainage holes 22 to the intra-wall ventilation layer 1d between the structural plywood 1a and the siding 1c.

4 and 5, the protruding end 21 of the tube portion 20 is inserted into the hole 2c of the siding 1c. The closing plate portion 30 is disposed so as to be substantially flush with the outer surface of the siding 1c.
As shown in FIG. 5, an annular gap 6 between the periphery of the hole portion 2c of the siding 1c and the outer periphery of the tube portion 20 is watertight sealed by a water-stopping material 40 such as a caulking material.

As shown in Figures 4 and 5, in the guide sleeve 10 in use, some of the easily breakable portions 31, 32 are broken, and the separable portion 33 inside is separated and removed to form the through holes 36, 37. For example, in Figure 4, one of the two circular easily breakable portions 31 and one rectangular easily breakable portion 32 are broken. As a result, one circular through hole 36 and one rectangular through hole 37 are formed.
As shown in FIG. 4 , of the plurality of easily breakable portions 31 , 32 , the remaining easily breakable portion 31 is not broken, and its inner detachable portion 33 remains as a part of the closure plate portion 30 .

5, an electric cable 3 is passed through each of the through-holes 36, 37. More specifically, a signal cable 3a covered with a sleeve pipe 3d is passed through the circular through-hole 36. A power cable 3b is passed through the rectangular through-hole 37.
The annular gaps 36c, 37c between the periphery of each through hole 36, 37 and the outer periphery of the electric cable 3 are watertight sealed by a water-stopping material 41 such as a caulking material.

<Electric cable wiring method>
Using the above-mentioned guide sleeve 10, the electric cable 3 is routed as follows.
The guide sleeve 10 is delivered to the construction site of the building in a default state, i.e., in a state where the easily breakable portions 31, 32 are not broken at all.
The guide sleeve 10 is installed in a through hole 2 formed in the outer wall 1. Regardless of the number of electric cables 3 to be routed, it is sufficient to form only one through hole 2 in the outer wall 1 for the guide sleeve 10 to pass through. It is not necessary to form multiple through holes in the outer wall 1 for each electric cable 3.
Before or after the guide sleeve 10 is installed on the outer wall 1, one or more of the easily breakable portions 31, 32 in the guide sleeve 10 are selected according to the number and type of electric cables 3 to be wired. The selected easily breakable portions 31, 32 are broken. For example, the selected easily breakable portions 31, 32 can be broken by piercing the bottom of the groove 35 with the tip of a flathead screwdriver or by hitting the separable portion 33 with a hammer. The easily breakable portions 31, 32 can be easily broken by forming them as deep annular grooves.
When only one electric cable 3 is required, only one easy-to-break portion is broken, whereas when three electric cables 3 are required, three easy-to-break portions 31, 32 are broken.
By breaking the selected frangible portions 31, 32, the separable portion 33 inside the selected frangible portions 31, 32 is separated from the guide sleeve 10. The separated separable portion 33 is removed. As a result, the through holes 36, 37 are formed with the selected frangible portions 31, 32 as their peripheries.

Next, the corresponding electric cables 3 are inserted into the through holes 36 and 37 .
Furthermore, the annular gap 6 is sealed by applying a water-stopping material 40 between the periphery of the hole portion 2c of the wall 1 and the guide sleeve 10, and the annular gaps 36c, 37c are sealed by applying a water-stopping material 41 between the periphery of the through-hole portions 36, 37 of the guide sleeve 10 and the electric cable 3.

According to the wiring construction method using the guide sleeve 10, the required number of through holes 36, 37 can be formed to pass the required electric cables 3 through. By leaving the unused easy-to-break portions 31 unbroken, it is possible to prevent the through holes 36 from being formed in vain. The unbroken easy-to-break portions 31 are not penetrated all around, so there is no need for waterproofing treatment. Naturally, there is no need to waterproof the blocking plate portion 39 of the blocking plate portion 30 other than the easy-to-break portions 31.
Therefore, the area of the gap or opening to which the waterproofing material should be applied is reduced, and the amount of waterproofing material to be applied can be reduced, which in turn shortens the construction period.
It is only necessary to apply the water-stopping materials 40, 41 to the small area annular gaps 36c, 37c in addition to the annular gap 6 on the outer periphery of the guide sleeve 10, and there is no need to seal the gaps between multiple bundled electric cables, making the work of applying the water-stopping material easy.
Furthermore, by passing the electric cables 3 through each of the through-hole portions 36, 37, at least in the blocking plate portion 30, the multiple electric cables 3 can be separated from each other by the blocking plate portion 39, thereby cutting the edges of the electric cables 3 from each other.

Next, another embodiment of the present invention will be described. In the following embodiment, the same reference numerals are given to the same components as those in the above-described embodiment, and the description thereof will be omitted.
Second embodiment (FIGS. 6 to 10)
As shown in Figures 6 to 8, in a guide sleeve 10B according to a second embodiment of the present invention, a partition wall 25 is provided inside the tubular portion 20. The partition wall 25 is disposed substantially parallel to the axis _L20 and intersects with the closure plate portion 30. The partition wall 25 is provided over the entire axial length of the tubular portion 20. The indoor end of the partition wall 25 is flush with the indoor side surface of the base plate 11. The outdoor end of the partition wall 25 is flush with the protruding end portion 21 of the tubular portion 20.

The partition 25 is disposed between the two first easily breakable portions 31 and the second easily breakable portion 32. The partition 25 separates the two first easily breakable portions 31 and the second easily breakable portion 32. The interior of the tube portion 20 is divided by the partition 25 into a first in-tube wiring path 23 and a second in-tube wiring path 24. As shown in FIG. 9, for example, a signal cable 3a is passed through the first in-tube wiring path 23. For example, a power cable 3b is passed through the second in-tube wiring path 24.

As shown in Figures 6 to 8, the closure plate portion 30 of the guide sleeve 10B is recessed toward the base plate 11 from the protruding end portion 21 of the tubular portion 20, and is positioned in the middle of the axial direction of the tubular portion 20. Inside the tubular portion 20, the closure plate portion 30 and the partition wall 25 intersect at a right angle. The peripheral portion of the closure plate portion 30 is continuous with the inner peripheral surface of the tubular portion 20.

Therefore, the protruding end 21 of the tube portion 20 protrudes beyond the closing plate portion 30. The protruding distance _L21 from the closing plate portion 30 to the protruding end 21 is preferably _L21 = several mm to several tens of mm, and more preferably _L21 = approximately 10 mm.

A breakable protrusion 34 is formed on the front surface 30a of each detachable portion 33. The breakable protrusion 34 is formed in a rectangular shape when viewed from the front.

As shown by the phantom lines in FIG. 7, when breaking the selected easily breakable portion 31 (32), a flat-head screwdriver 7, for example, is prepared as a breaking tool. The tip of the flat-head screwdriver 7 is placed against the recessed corner formed by the breaking protrusion 34 and the closing plate portion 30, and the rear end of the flat-head screwdriver 7 is struck with a hammer 8. This causes a stress wave to propagate as an impact stress to the selected easily breakable portion 31 (32), making it possible to easily break the easily breakable portion 31 (32).

By breaking the easily breakable portion 31 (32), a through hole portion 36 (37) is formed. Through the through hole portion 36 (37), the wiring path portions on both sides of the closing plate portion 30 in the in-tube wiring path 23 (24) are connected to each other. In other words, the in-tube wiring path 23 (24) is opened. The electric cable 3 is passed through the opened in-tube wiring path 23 (24).

As shown in FIG. 9, inside the guide sleeve 10B, the signal cable 3a of the first in-cylinder wiring path 23 and the power cable 3b of the second in-cylinder wiring path 24 are wired completely isolated by the partition wall 25. Therefore, it is possible to reliably prevent these cables 3a and 3b from contacting each other inside the guide sleeve 10B.

9, the protruding end 21 of the guide sleeve 10B is flush with the outdoor side surface of the exterior wall 1 and substantially abuts against the waterproof outlet 4. Meanwhile, the blocking plate 30 is positioned recessed from the waterproof outlet 4 by a distance _L21 toward the indoor side. Therefore, the sheath pipe 3d can be passed through the through hole 36 and retracted toward the waterproof outlet 4 beyond the blocking plate 30. In short, the guide sleeve 10B makes it possible to set the retraction allowance of the sheath pipe 3d.
Furthermore, the tip of the insulating coating portion 3f of the power cable 3b can be reliably positioned on the waterproof outlet 4 side relative to the closure plate portion 30 through the through hole portion 36.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the number of easily breakable portions 31, 32 of the guide sleeve 10 is not limited to three, but may be two, four or more, as long as it is plural.
The groove 35 of the easily breakable portion may be formed on the rear side surface 30b of the closure plate portion 30, or on both surfaces 30a, 30b.
The electrical equipment to which the electrical cable 3 is connected is not limited to a water heater, but may be an outdoor unit of an air conditioner, a television receiver, etc. The electrical cable passed through the guide sleeve may be a television antenna cable. In other words, the guide sleeve can also be used as an inlet for a television antenna cable.
The wall in which the guide sleeve is provided and through which the electric cable passes is not limited to the exterior wall of the building, but may also be an interior wall.

The present invention can be applied, for example, to wiring electrical cables that penetrate the exterior walls of a house.

1. Exterior wall (wall)
2 Through hole 3 Electric cable 3a Signal cable (electric cable)
3b Power cable (electrical cable)
3f insulating coating portion 6 annular gap 10 guide sleeve 10B guide sleeve 11 base plate 12 circular hole 20 tube portion 21 protruding end portion 23 first tube internal wiring path 24 second tube internal wiring path 25 partition wall 30 closing plate portion 31 first easily breakable portion 32 second easily breakable portion 33 detachable portion 34 breaking protrusion 35 groove 36, 37 through hole portion 36c, 37c annular gap 39 closing plate portion 40, 41 water stop material

Claims (5)

A guide sleeve for guiding one or more electrical cables through a wall of a building, comprising:
an annular base plate fixed to a periphery of a through hole formed in the wall;
a cylindrical portion protruding from an inner peripheral edge of the base plate in a direction intersecting the base plate;
A closure plate portion formed in a plate shape intersecting the axis of the cylindrical portion, the peripheral portion of which is continuous with the cylindrical portion,
A guide sleeve for a building wall-penetrating electrical cable, characterized in that the blocking plate portion has a plurality of closed, annular, easily breakable portions spaced apart from each other, and the outer blocking plate portion of each easily breakable portion and the inner separable portion are connected via the easily breakable portions around the entire circumference of the separable portion. The guide sleeve for a building wall-penetrating electrical cable according to claim 1, characterized in that each of the easily breakable portions is a closed annular groove formed in the blocking plate portion, and the groove does not penetrate the blocking plate portion in the thickness direction over the entire circumference. The guide sleeve for a building wall-penetrating electrical cable according to claim 1 or 2, characterized in that a partition wall separating a first easily breakable portion and a second easily breakable portion of the plurality of easily breakable portions is provided inside the tubular portion so as to intersect with the blocking plate portion. The guide sleeve for a building wall-penetrating electrical cable according to any one of claims 1 to 3, characterized in that the blocking plate portion is disposed in the middle of the axial direction of the cylindrical portion, and the protruding end portion of the cylindrical portion protrudes beyond the blocking plate portion. An electric cable wiring method for wiring one or more electric cables through a wall of a building using the guide sleeve according to any one of claims 1 to 4,
The guide sleeve is placed in a through hole formed in the wall;
Before or after the installation, one or more of the easily breakable portions are selected from the plurality of easily breakable portions in the guide sleeve, and the selected easily breakable portion is broken to separate and remove the inner separable portion from the guide sleeve, thereby forming a through hole portion having a periphery around the selected easily breakable portion;
The electric cable is inserted through the through hole.
An electric cable wiring installation method, comprising providing a water-stopping material between the periphery of the through hole and the guide sleeve, and between the periphery of the through hole portion and the electric cable.

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