JP2004120956A - Trough for multipurpose duct of electric cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trough for a multipurpose duct of electric cables where various communication cables and power cables are housed together with no effect of electromagnetic waves, and the communication cables are aligned without being entangled to allow easy additional drawing of communication cables. <P>SOLUTION: A recess 1d for housing a power cable 6 is formed on the bottom 1c of a trough body 1 along the entire length of it, with the recess 1d covered with an electromagnetic wave shield plate 4. A plurality of cable support plates 3 provided with a plurality of cable insert holes 3a are provided with a constant space, inside such trough body 1 as above the electromagnetic wave shield plate 4 that houses a communication cable 5 with a lid 2 attached to the trough body 1. The electromagnetic waves from the power cable 6 is shielded with the electromagnetic wave shield plate 4 to eliminate the effect on the communication cable 5, and the cable support plate 3 aligns the communication cables 5 for housing. A partition for shielding electromagnetic waves may be erected from the bottom of the trough body to provide into a power cable housing and a communication cable housing. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a small-sized trough for a common electric wire groove buried in a narrow sidewalk or the like.
[0002]
[Prior art]
In recent years, the development of electric wire joint ditch has been promoted based on the new ground undergrounding plan. When constructing an electric wire joint groove on a narrow sidewalk or on a road section without a sidewalk, it is necessary to make the electric wire joint groove compact. Therefore, it is desirable to accommodate various communication cables and low-voltage power cables together in the trough.
[0003]
[Problems to be solved by the invention]
However, when the communication cable and the power cable are housed together inside the small electric wire common groove trough, there is a problem that electromagnetic waves emitted from the power cable adversely affect the communication cable.
[0004]
Also, if a large number of communication cables such as an optical cable and a CATV cable are accommodated inside a small trough for a common wire groove, the cables become entangled and cluttered, making it difficult to understand the type of the cable. However, there is a problem that even if an attempt is made to pull in an additional new cable, the entangled cable is in the way and the new cable cannot be easily pulled in.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to address the above problems, and has as its object to eliminate the influence of electromagnetic waves and to accommodate various communication cables and power cables together, and to add communication cables neatly and without tangling. It is an object of the present invention to provide a trough for a wire common groove, which can easily perform a work for drawing in a communication cable.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the electric wire joint groove trough of the present invention has a recess for accommodating the power cable formed at the bottom of the trough body over the entire length of the trough body, and covers this recess with an electromagnetic wave shielding plate. Inside the trough body above the electromagnetic wave shielding plate that houses the communication cable, a plurality of cable support plates with a plurality of cable insertion holes are erected at regular intervals in the longitudinal direction of the trough body, and the lid is It is characterized by being attached to a trough body.
[0007]
The trough for an electric wire common groove having such a configuration accommodates a power cable in a concave portion formed at the bottom of the trough main body, and inserts a cable through a cable support plate erected inside the trough main body above the electromagnetic wave shielding plate. By inserting various communication cables into the holes, the communication cables can be housed together with the power cable in a state where they are neatly arranged. It does not adversely affect the communication cable because it is blocked by the communication cable. Then, when pulling in an additional new cable, the additional cable can be easily pulled in in a neatly arranged state by passing the additional cable through a surplus cable insertion hole of the cable support plate using a pull-in wire or the like. . Further, since the power cable and the communication cable are vertically separated by the electromagnetic wave shielding plate, by making a hole in the side wall of the trough main body, the power cable and the communication cable can be pulled out laterally without interference.
[0008]
In this trough for a wire common groove, it is desirable to use an iron plate having excellent electromagnetic wave blocking performance as the electromagnetic wave blocking plate. If such an iron plate is used, it is possible to sufficiently prevent adverse effects on the communication cable.
[0009]
In another trough for a common wire groove of the present invention, a partition wall for blocking electromagnetic waves is erected from the bottom of the trough main body over the entire length of the trough main body, and the inside of the trough main body communicates with the power cable housing section. A plurality of cable support plates, each having a plurality of cable insertion holes, are erected at regular intervals in the longitudinal direction of the trough main body, and the cover is covered with the trough main body. It is characterized by wearing.
[0010]
The trough for an electric wire common groove having such a configuration accommodates a power cable in the power cable housing portion and inserts various communication cables into cable insertion holes of a cable support plate erected in the communication cable housing portion. However, the communication cables can be housed together with the power cables in a state where they are neatly arranged, and even if housed in this way, the electromagnetic waves emitted from the power cables are blocked by the partition walls for blocking the electromagnetic waves. There is no adverse effect. Also, the additional cable can be easily drawn in the orderly arranged state by passing the additional cable through the surplus cable insertion hole of the cable support plate.
[0011]
In this electric wire common groove trough, it is desirable to set up a partition wall for blocking electromagnetic waves with an iron plate adhered to one side, and when such a partition wall is set up, an excellent electromagnetic wave blocking action is provided by the iron plate on one side. Therefore, adverse effects on the communication cable can be sufficiently prevented.
[0012]
In any of the above-mentioned troughs for electric wire common grooves, it is desirable that the cable insertion hole of the cable support plate is formed in a bell mouth shape, that is, a tapered shape in which the hole diameter gradually increases as approaching the tip. When the mouse-shaped cable insertion hole is formed, the communication cable is smoothly inserted without being caught on the edge of the hole, so that the communication cable can be prevented from being damaged and trouble caused by moisture entering from the damaged part can be prevented. Can be prevented.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 is an exploded perspective view of a trough for a common groove for electric wires according to an embodiment of the present invention, FIG. 2 is a plan view of a trough body of the trough for a common groove for electric wires, and FIG. 3 is a view of a cable support plate used in the trough. FIG. 4 is an enlarged cross-sectional view of the cable support plate taken along the line AA, FIG. 5 is a cross-sectional view of the trough, and FIG. 6 is a schematic cross-sectional view showing a buried construction state of the trough.
[0014]
As shown in FIG. 1, a trough for a wire common groove according to this embodiment includes a trough body 1, two lids 2, several (seven in FIG. 1) cable support plates 3, and electromagnetic wave shielding. And the plate 4.
[0015]
The trough main body 1 is a trough-shaped long molded body formed of concrete and having a substantially U-shaped cross-section, and as shown in FIGS. 1 and 2, upper ends of both side walls 1 a of the trough main body 1. Are formed with lid receiving steps 1b, 1b. A recess 1d for accommodating a low-voltage power cable is formed in the bottom 1c of the trough main body 1 over the entire length of the trough main body 1, and the inner surfaces of both side walls 1a, 1a of the trough main body 1 are formed on the bottom 1c. A plurality of pairs (seven pairs in FIGS. 1 and 2) of opposed vertical grooves 1e, 1e are formed at regular intervals in the longitudinal direction of the trough body 1.
[0016]
An electromagnetic wave shielding plate 4 is provided on the bottom 1c of the trough main body 1 in an overlapping manner, and the electromagnetic wave shielding plate 4 covers a concave portion 1d for accommodating a power cable. As the electromagnetic wave shielding plate 4, an iron plate or the like having excellent electromagnetic wave shielding performance is preferably used.
[0017]
The trough body 1 may be formed of a material other than concrete, for example, SMC (sheet molding compound) or another synthetic resin. It is preferable to provide a reinforcing rib for increasing the height.
[0018]
The lid 2 to be put on the trough main body 1 is formed in a rectangular plate shape from concrete or the like, and the length of the lid 2 is half the length of the trough main body 1 so that two can be attached to the trough main body 1. It has been. As shown in FIG. 5, these lids 2 are detachably attached by locking both side edges thereof to lid receiving steps 1b, 1b of the trough main body 1. Note that these lids 2 may be formed of the above-mentioned SMC or synthetic resin.
[0019]
The cable support plate 3 is a rectangular plate as shown in FIGS. 1, 3 and 4, and is preferably made of SMC or other synthetic resin, but may be of metal. As shown in FIG. 3, the cable support plate 3 has a plurality of cable insertion holes 3a arranged in a horizontal line and formed in two rows vertically, and each cable insertion hole 3a is formed as shown in FIG. , A bell mouth shape, that is, a tapered shape in which the hole diameter gradually increases toward the tip.
[0020]
By providing such a bell-mouth-shaped cable insertion hole 3a, the communication cable 5 can be smoothly inserted without being hooked on the edge of the cable insertion hole 3a, so that the communication cable 5 can be prevented from being damaged. In addition, it is possible to prevent trouble from occurring due to moisture entering from the damaged portion. In addition, when the cable insertion holes 3a are formed in two rows in the vertical direction as described above, it goes without saying that a large number of communication cables 5 can be accommodated, but as shown in FIG. The communication cable 5 to be accommodated is inserted through the communication cable 5a to be accommodated, and the communication cable 5a to be drawn out to the side of the trough main body 1 is inserted into the cable insertion hole 3a in the upper row, thereby connecting the upper communication cable 5a to the lower side. This is convenient because it can be pulled out to the side of the trough so as not to contact the communication cable 5. Further, since the power cable 6 and the communication cable 5 are vertically separated by the electromagnetic wave shielding plate 4, by making a hole in the side wall of the trough main body, the electronic cable 6a to be drawn out also does not interfere with the communication cable 5 in the horizontal direction. Can be withdrawn.
[0021]
Note that the bell mouth-shaped cable insertion holes 3a may be formed in only one line, or may be formed in three or more lines vertically. The bell mouth-shaped cable insertion hole 3a may be formed integrally with the cable support plate 3 using a synthetic resin or the like as shown in FIG. The insertion holes 3 a may be formed separately and attached to the cable support plate 3. Although the cable insertion hole 3a shown in FIG. 4 is formed so as to protrude on both front and rear sides of the cable support plate 3, it is formed so as to protrude on either one of the front and rear sides, and the protruding cable insertion hole allows the communication cable 5 to be inserted. The cable support plate 3 may be erected inside the trough main body 1 so as to be on the side where the cable is inserted.
[0022]
The cable support plate 3 has a rectangular frame whose four peripheral edges (upper edge 3b, left and right side edges 3c, 3d, and lower edge 3e) have a width substantially equal to the width of the vertical grooves 1e, 1e of the trough body 1. As shown in FIGS. 1 and 4, the left and right side edges 3c and 3d of the cable support plate 3 are inserted into the vertical grooves 1e and 1e of the trough main body 1 from above, so that the electromagnetic wave shielding plate is formed. The upper part of the trough body 1 above the upper part 4 is stood up at regular intervals without any backlash. When the left and right side edges 3c, 3d of the cable support plate 3 are inserted into the vertical grooves 1e, 1e in this manner, no metal fittings or the like for fixing are required, so that the number of parts is reduced, and the cable support plate 3 Erecting work can be performed efficiently in an extremely short time.
[0023]
The distance between the cable support plates 3 is not particularly limited, but is preferably set to, for example, about 0.3 to 1 m. With such a distance, the communication cable 4 inserted into the cable insertion hole 3a is greatly lowered. It can be supported in a substantially linear state so as not to be bent.
[0024]
As shown in FIGS. 1 and 5, when the cable support plate 3 is erected inside the trough main body 1 above the electromagnetic wave shielding plate 4, the upper edge 3 b of the cable support plate 3 and the lid receiving step of the trough main body 1 are provided. The parts 1b, 1b are at the same height. Therefore, when the lid 2 is attached to the trough body 1, the upper edge 3b of the cable support plate 3 comes into contact with the lower surface of the lid 2 to support the lid 2 from below. This makes it difficult for the lid 2 to crack or the trough body 1 to be crushed. Further, since both side walls 1a, 1a of the trough main body 1 are also supported from the inside by the cable support plate 3, the pressure resistance against the earth pressure acting on the trough main body 1 from the left and right is also improved. Such an effect of improving the pressure resistance is sufficiently exhibited when the mutual distance between the cable support plates 3 is about 0.3 to 1 m as described above.
[0025]
As shown in FIG. 6, the trough for a wire common groove having the above-described configuration has the trough body 1 laid below the surface layer 7 a of the pavement of the narrow sidewalk 7, and the power cable 6 is recessed in the trough body 1. 1d and accommodated therein, and various communication cables 5 such as optical cables and CATV cables are inserted into the cable insertion holes 3a of the respective cable support plates 3 so that the communication cables 5 are arranged in a neat manner so as not to be entangled. It is housed in the main body 1, the lid 2 is attached to the trough main body 1, and is buried under the surface layer 7a. Even if the power cable 6 and the communication cable 5 are housed together, the electromagnetic wave emitted from the power cable 6 is blocked by the electromagnetic wave shielding plate 4, so that the communication cable 5 is not adversely affected. Further, when an additional new communication cable is to be pulled in, the additional cable is passed through the remaining cable insertion hole 3a of the cable support plate 3 using a pull-in wire or the like, so that the cable is easily pulled in an orderly state. Therefore, the workability is good.
[0026]
As described above, since the above-mentioned trough for electric wire common groove can receive the power cable 6 and the communication cable 5 together without the influence of the electromagnetic wave, the power cable 6 is inserted into a resin pipe or the like and separately buried below the trough. This eliminates the necessity to perform the work, thereby simplifying the construction and reducing the size of the joint groove for electric wires.
[0027]
FIG. 7 is an exploded perspective view of a trough for a common wire groove according to another embodiment of the present invention, FIG. 8 is a plan view of a trough body of the trough for a common wire groove, and FIG. 9 is a cross-sectional view of the trough.
[0028]
As shown in FIG. 7, the trough for a common wire groove has a partition wall 1 f for blocking electromagnetic waves extending from the bottom 1 c of the trough body 1 having a substantially U-shaped cross section over the entire length of the trough body 1. The inside of the trough main body 1 is partitioned into a power cable housing 1g and a communication cable housing 1h by the partition wall 1f. Then, in order to enhance the electromagnetic wave blocking performance of the partition wall 1f, an iron plate 1i is attached to one surface of the partition wall 1f on the side of the power cable housing section.
[0029]
As shown in FIG. 8, a plurality of sets of opposing vertical grooves 1e, 1e are formed in the longitudinal direction of the trough main body on the side wall 1a and the partition wall 1f located on both sides of the communication cable accommodating portion 1h of the trough main body 1. A horizontal groove 1j connecting the lower ends of these vertical grooves 1e, 1e is formed in the bottom 1c of the trough main body 1. As shown in FIGS. 7 and 9, the left and right side edges 3c and 3d and the lower edge 3e of the cable support plate 3 are inserted into the vertical grooves 1e and 1e and the horizontal groove 1j from above. A plurality of 3 are erected without any backlash in the communication cable housing 1h at regular intervals.
[0030]
Similar to the above-described cable support plate 3, the cable support plate 3 is formed by arranging bell-mouth-shaped cable insertion holes 3a in a horizontal row and forming two rows in the upper and lower rows. It is set smaller than the above-mentioned cable support plate 3 so as to match the width dimension.
[0031]
Other structures of the electric wire common groove trough are the same as those of the above-described electric wire common groove trough. Therefore, in FIGS. 7, 8, and 9, the same members are denoted by the same reference numerals, and description thereof will be omitted.
[0032]
As shown in FIG. 9, the electric wire common groove trough of this configuration accommodates the electric power cable 6 in the electric power cable accommodating portion 1g and inserts the cable through the cable support plate 3 erected in the communication cable accommodating portion 1h. By inserting various communication cables 5 into the holes 3a, the communication cables 5 can be housed together with the power cable 6 in a state where they are neatly arranged so as not to be entangled. Since the electromagnetic wave emitted from the cable 6 is sufficiently blocked by the electromagnetic wave blocking partition wall 1f having the iron plate 1i adhered to one side, the communication cable 5 is not adversely affected. Also, the additional cable can be easily drawn in the orderly arranged state by passing the additional cable through the surplus cable insertion hole 3a of the cable support plate 3 also in the electric wire common groove trough.
[0033]
As described above, since the electric cable common groove trough can also accommodate the power cable 6 and the communication cable 5 together without the influence of electromagnetic waves, the power cable 6 is inserted into a resin pipe or the like and separately buried below the trough. This eliminates the necessity to perform the work, thereby simplifying the construction and reducing the size of the joint groove.
[0034]
【The invention's effect】
As is clear from the above description, the electric wire common groove trough of the present invention blocks electromagnetic waves emitted from the power cable by the electromagnetic wave shielding plate and the partition wall for electromagnetic wave shielding, so that the communication cable is not adversely affected. The power cable and the communication cable can be housed in a neatly arranged state together, the additional communication cable can be easily pulled in, the wire joint groove can be made compact, and the workability can be improved. To play.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an electric wire common groove trough according to an embodiment of the present invention.
FIG. 2 is a plan view of a trough body of the electric wire common groove trough.
FIG. 3 is a front view of a cable support plate used in the electric wire common groove trough.
FIG. 4 is an enlarged sectional view of the cable support plate taken along line AA.
FIG. 5 is a sectional view of the electric wire common groove trough.
FIG. 6 is a schematic sectional view showing a buried construction state of the trough.
FIG. 7 is an exploded perspective view of an electric wire common groove trough according to another embodiment of the present invention.
FIG. 8 is a plan view of a trough main body of the electric wire common groove trough.
FIG. 9 is a sectional view of the electric wire common groove trough.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Trough main body 1c Trough bottom 1d Recess 1f for accommodating power cable Partition wall 1g for shielding electromagnetic waves 1g Power cable accommodating section 1h Communication cable accommodating section 1i Iron plate 2 adhered to partition wall 2 Cover 3 Cable support plate 3a Cable Insertion hole 4 Electromagnetic wave shielding plate 5, 5a Communication cable 6 Power cable

Claims (5)

At the bottom of the trough body, a recess for accommodating the power cable is formed over the entire length of the trough body, and this recess is covered with an electromagnetic wave shielding plate, and inside the trough body above the electromagnetic wave shielding plate for housing the communication cable, A trough for a wire joint groove, wherein a plurality of cable support plates having a plurality of cable insertion holes are erected at regular intervals in the longitudinal direction of the trough body, and a lid is attached to the trough body. A partition wall for blocking electromagnetic waves is erected from the bottom of the trough main body over the entire length of the trough main body, and the inside of the trough main body is divided into a power cable housing section and a communication cable housing section. A trough for an electric wire joint groove, comprising a plurality of cable support plates having cable insertion holes formed therein at predetermined intervals in a longitudinal direction of the trough main body, and a lid attached to the trough main body. The trough according to claim 1, wherein the electromagnetic wave shielding plate is an iron plate. The trough for an electric wire common groove according to claim 2, wherein the partition wall for blocking electromagnetic waves is one in which an iron plate is stuck on one surface. The trough according to claim 1 or 2, wherein the cable insertion hole of the cable support plate is formed in a bell mouth shape.

Images