JP2005117877A - Underground multi-purpose duct box for electric wires - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contribute to the streamlining of branching and connecting work of cables, naturally of making a box itself compact, by providing improvements so as to enable making of the effective width of an underground multi-purpose duct box as small as possible, and contain cables which include trunk system cables and wiring system cables individually and systematically. <P>SOLUTION: Duct sleeves 3, 4 into which cable pipe lines C, c for the trunk system cables and the wiring system cables are each inserted are mounted on both sidewall portions 2a, 2c facing each other of the narrow side of a box unit 1 of a rectangular parallelepiped. The upper edge portion of the inside wall surface of one side wall portion 2b of sidewall portions 2b, 2d that face each other of long side of the box unit 1 is formed into a stepped portion 5. On this stepped portion 5, a receiving metal strip 6, that receives a support bracket for a closure, is mounted so as to become flush with the inside wall surface with a gap provided between the back wall surface 5a of the stepped portion 5 and the strip. Inside the box unit 1, a partition member 8 is provided that partitions the cables drawn out of the cable pipe lines C, c. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a common groove box for electric wires provided in the ground for branch connection work for drawing various types of electric wires such as information communication cables laid underground in each customer.

  Needless to say by literature, branch connection work such as information communication cables laid underground is carried out using a common groove box buried under roads (mainly sidewalks) such as sidewalks and roadways, In this common groove box, various cables such as metal cables, optical cables and coaxial cables drawn out from the cable pipes are accommodated, and branching to each customer side using closures and tap-offs dedicated to each cable. Connection work is in progress. Since the branch connection work was carried out by a worker in the common groove box, it was necessary to enlarge the box by the work space. In general, the common groove box protrudes from one of the inner wall surfaces of the box, for example, the length of a receiving metal for mounting and fixing a closure is 200 mm, and a width of 500 mm is added as a working space, and 700 mm is the largest. Designed as narrow.

  On the other hand, when installing a common ditch box, water pipes and gas pipes buried in the installation location often become obstacles, resulting in the problem of relocation of these obstacles. Together with this, the construction cost of the joint groove box will be greatly affected. In order to avoid such a problem, as one of the attempts to make the width of the joint groove box as small as possible, the closure can be lifted upward from the permanent position in the joint groove box, and the closure can be supported at the lifting position on the ground. Thus, there has been proposed a closure support hardware that allows an operator to be on the ground side and perform a cable branch connection work. Here, the closure is a device used for branch connection of a normal information communication system cable, and the tap-off is a device used for branch connection of a coaxial cable having high rigidity of CATV.

  By the way, the joint groove box in which the operator is on the ground side and can perform the cable branch connection work can reduce the width of the box, but on the other hand, when the closure performing the branch connection work is moved upward, or when the closure is lowered, The cable closures that are entangled with the various cables accommodated in the cable, especially the hard (highly rigid) coaxial cable, cannot be pulled up easily, and the branch connection work is complicated and the workability is reduced. There is a problem of getting extremely bad. In addition, the common groove box needs to be configured to have a light and compact structure by making the width as small as possible so that it can be applied to narrow sidewalk width. An elongated flat steel receiver for receiving the support metal of the closure is attached to one surface of the inner wall surface of the common groove box in a state protruding slightly from the inner wall surface.

  The present invention solves the above-mentioned problem, and its purpose is to receive an ordinary information communication system cable group, a hard coaxial cable, etc. in a common groove box in an orderly manner and to receive a support metal fitting for the closure. The receiving metal is provided flush with the inner wall surface of the common groove box, and the box is improved so that the effective width of the box is as small as possible. It is to provide a joint groove box for electric wires that can contribute to rationalization of the wire. Another object of the present invention is to provide a joint groove box which is improved so as to facilitate the laying and branch connection work of a trunk cable and a wiring cable.

  In order to achieve the above object, the joint groove box of the electric wire, which is a feature of the present invention, has both a main cable and a wiring cable on both side walls facing each other on the short side of the box body which is a rectangular parallelepiped. Duct sleeves are respectively attached, while the inner wall surface of one of the opposing side wall portions on the long side of the box body is formed with a portion near the upper edge as a paragraph portion. In this case, a receiving metal for receiving the support metal of the closure is attached flush with the inner wall surface with a gap provided between the inner wall and the inner wall of the box. It is the structure provided with the partition member which partitions off the cable pulled out from the cable pipe line.

  In the above configuration of the joint groove box for this electric wire, both duct sleeves are mounted so as to be shifted from each other in the horizontal direction so as to be positioned to the left and right from the vertical center line of the side wall (conventionally positioned on the vertical center line) Is preferable for facilitating cable branch connection work. In addition, the box body is made of resin (resin) concrete in terms of strength, so that the wall thickness of 110 mm required for cement concrete can be increased to 60 mm, which makes the outer dimensions of the product 100 mm in total. It can be downsized, and burial work that does not require obstacles on narrow roads can be done.

  According to the joint groove box of the present invention configured as described above, the effective width is configured to be a small width that can be buried avoiding underground obstacles, so the relocation work of existing living pipelines is greatly It is possible to reduce the cost and achieve cost reduction. In addition, the box body can store cables with high rigidity, such as difficult-to-handle cables, with other wiring cables in an orderly manner, preventing congestion and interference between cables, and moving the closure upward The branch connection work of the wiring system cable can be easily performed.

  Hereinafter, specific embodiments for carrying out the present invention will be described with reference to the drawings. 1 to 2, a box body 1 that is a rectangular parallelepiped is made of resin (resin) concrete, which is a high-strength material using polyester instead of cement, and opposite side walls on the short side of the box body 1. 2a and 2c are provided with duct sleeves 3 and 4 for inserting the cable lines C and c of the trunk cable and the wiring cable, respectively, and the side walls 2b and 2d facing each other on the long side. The inner wall surface portion of one side wall portion 2b (on the side of the cable leading to a customer or the like) is formed in a paragraph portion (a recessed portion having a depth of about 25 mm) 5 near the upper edge.

  The duct sleeves 3 and 4 are mounted so as to be shifted from each other in the horizontal direction so as to be positioned to the left and right from the vertical center line of the side walls 2a and 2c, and the duct sleeve 4 is provided higher than the other duct sleeve 3. It is preferable that the cable branch connection work is facilitated. In the paragraph portion 5, a receiving hardware 6 for receiving a support metal fitting (described later with reference to FIG. 3) with a gap a between the rear wall surface 5 a of the paragraph portion 5 is provided with a bolt 7 a and a nut. 7b and spacer s are used. That is, a nut 7 b is embedded in the box body 1 at the back of the paragraph 5 by a so-called insert molding method when the box body 1 is formed, in a state flush with the back wall 5 a of the paragraph 5.

  The receiving piece 6 and the spacer s are provided with an insertion hole (burr hole) for the bolt 7a. By screwing the bolt 7a inserted from the insertion hole into the nut 7b via the spacer s, the receiving piece 6 is A gap a is formed between the rear wall surface 5a of the paragraph part 5 and can be fixed to the paragraph part 5 in a state of being flush with the inner wall surface part of the side wall part 2b. Of course, other means may be used. The receiving metal 6 is made of an elongated flat steel having a thickness of about 9 mm, and the receiving metal 6 is provided with a plurality of fixing holes 6a (burst holes) for fixing the closure supporting metal to a required receiving position. It has been. Further, a partition member 8 for partitioning the cable drawn from the cable conduits C and c is provided in the box body 1.

  In FIG. 1, the partition member 8 is a gate-shaped bar attached to the bottom of the box body 1 along the longitudinal direction of the box body 1, but this may be a member that can partition a cable. Other shapes may be used. Further, although not shown in the figure, on the inner wall surface portion of the side wall portion 2d opposite to the inner wall surface portion on which the metal fitting 6 is provided, a plurality of strip-shaped metal fittings for attaching tap-offs are vertically attached at intervals, and the trunk cable It is also possible to carry out a branch connection on the side opposite to the other cables, and the inner wall surface of each of the strip-shaped hardware is a paragraph portion (see FIG. 2) corresponding to the strip-shaped hardware. The broken-line part) 9 is arranged side by side, and a short saddle-shaped metal object is attached to these paragraph parts 9 so as to provide a gap in the same manner as the receiving metal object 6 described above. In the figure, reference numeral 10 denotes a drain outlet with a check valve.

  In FIG. 3, the closure 11 is mounted on a support metal 13 via a support base 12, and is latched to a receiving metal 6 at both upper and lower ends (the lower half of the support metal 13 is omitted) of the support metal 13. An inverted U-shaped fitting portion 14 that can be formed is fixed. In the illustrated case, the fitting portion 14 on the upper end side is hooked on the support metal 6 and the closure 11 is supported at a permanent position in the joint groove box (box body 1). The stopper pin 15 provided on the holder 6 is inserted into the stopper hole 6a of the hardware 6 to prevent the metal hardware 6 from moving left and right. When carrying out the branch connection work of the cable, the support metal 12 is pulled upward, and the fitting part on the lower end side is received and hooked on the metal 6 as described above.

  The joint groove box configured as described above can support the closure and the tap-off on the opposite sides by using the opposing inner wall surfaces as required, and the width of the common groove box requires a wall thickness. The upper part (the part where the paragraph parts 5 and 8 are provided) can be downsized to 700 mm, and the lower part can be reduced to 620 mm. In addition, when implementing this joint groove box so that only one of a closure or a tap-off can be supported, the said horizontal width can also be reduced further.

  It is a perspective view which cuts off and shows an embodiment of the present invention partially.   It is the sectional view on the AA line of FIG.   It is a figure explaining the support state of the closure to the receiving metal object shown in FIG. 1, and is the fragmentary perspective view which abbreviate | omitted the lower half part side of the receiving metal object.

Explanation of symbols

1 is a box body 2a, 2b, 2c, 2d is a side wall part 3, 4 is a duct sleeve 5, 5 is a paragraph part 5a is a back wall surface 6 is a receiving metal 6a is a retaining hole 7a is a bolt 7b is a nut 8 is a partition member 10 is a drain port a is gap C, c is cable conduit

Claims (3)

  Duct sleeves for inserting both cable lines of the trunk cable and wiring cable are attached to opposite side walls on the short side of the box body which is a rectangular parallelepiped, while the long side of the box body is The inner wall surface portion of one side wall portion of the opposite side wall portions is formed with a portion near the upper edge in a paragraph portion, and in this paragraph portion, a gap is provided between the inner wall surface portion and the rear wall surface of the paragraph portion. The receiving hardware for receiving the supporting hardware is attached flush with the inner wall surface, and the box body is provided with a partition member for partitioning the cables drawn out from the both cable conduits. Joint groove box for electric wires.   2. The joint groove box for electric wires according to claim 1, wherein the box body is made of resin (resin) concrete.   3. The joint groove box for electric wires according to claim 1 or 2, wherein both the duct sleeves are attached so as to be shifted in the horizontal direction so as to be located on the left and right from the vertical center line of the side wall.

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