JP2003304617A - Branch inlet for cable-protecting tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch inlet for a cable-protecting tube which achieves easy connection of an outer tube to the branch inlet, while improving workability in handling, carrying, mounting or the like, by reducing the weight of the branch inlet. <P>SOLUTION: The synthetic resin made branch inlet for a cable protecting tube is equipped with a cylindrical inlet body 11, a pair of outer tube connecting ports 13, 14 consisting of a socket or a spigot, which is provided to the peripheral wall of the inlet body and to which an end of the outer tube is connected via a rubber ring, a branch tube connecting port 16 which is provided in the branch direction of a branch cable and to which an end of the branch tube 15 is connected, a bottom cover 17 for closing the bottom opening of the inlet body, a rise tube 18 connected to the top opening of the inlet body, and a sheath tube supporting member 21, which is provided to the insides of the outer tube connecting ports and with a plurality of sheath tube connecting ports 20, connected the ends of the sheath tube respectively. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch box for a cable protection pipe, and more specifically, in a conduit structure of a cable protection pipe used when laying a cable such as an optical fiber and a power line, a part of a plurality of main cable The present invention relates to a branch box for a cable protection pipe installed in a portion for branching.

[0002]

2. Description of the Related Art With the recent urban development, telephone lines and CAT
Buried cables such as V-cables and power lines are underway. As a means of burying these cables in the ground, an outer tube (protection tube) is laid between manholes and handholes installed at appropriate intervals, and a small-diameter sheath tube that pulls the cable through is stored in this outer tube. Cable protection tubes with this structure are widely used. In addition, when the cable is drawn into each building, a special branch box is installed in the middle of the cable protection pipeline, and a branch pipe in the building direction is connected to this branch box, and the cable branched inside this branch pipe I try to pull it into the building through.

[0003]

However, in the conventional branch stakes, concrete square stiles are mainly used, and even when connecting the outer branch pipe to the branch stake, work using mortar or the like on site. Was needed. Further, since the conventional branch basin is a heavy object made of concrete, it has many problems in handling, transportation, installation and the like. In particular, large-scale construction is required even when branching a part of a plurality of trunk side cables, for example, several cables.

Therefore, the present invention improves the workability in handling, transportation, installation, etc. by reducing the weight of the branch box, and also makes it easy to connect the outer pipe and the branch tube to the branch box. It is intended to provide a branching box for a protection tube.

[0005]

In order to achieve the above-mentioned object, the branch box for a cable protection pipe of the present invention has a plurality of sheath pipes inserted into an outer pipe, and a cable inserted into the sheath pipe. A branch box for a cable protection tube made of synthetic resin, which is installed at a cable branch portion of the cable protection tube, wherein the cable branch box includes a cylindrical box body and an end of the outer tube provided on a peripheral wall of the box body. A pair of outer pipe connecting ports, each of which is formed by a receiving port or a spigot connected via a rubber ring, and an end of a branch pipe provided in the branch direction of the branch cable and having a diameter corresponding to the sheath pipe are connected. A branch pipe connection port, a bottom lid that closes the bottom opening of the box body, a rising pipe connected to the upper opening of the box body, and an end portion of the sheath pipe provided inside the outer pipe connection port. And a sheath pipe support member having a plurality of sheath pipe connection ports connected to each other. It is characterized in that.

Further, in the branch box for a cable protection pipe of the present invention, the rising pipe has a pair of main line side connection ports for connecting the ends of the single housing pipes for individually passing the cable,
It is characterized in that it is provided with a branch side connection port for connecting a single housing pipe on the cable branch side.

[0007]

1 to 3 show a first embodiment of a branch box for a cable protection tube according to the present invention. FIG. 1 is a partially sectional front view of the branch box, and FIG. 2 is a view of the branch box. FIG. 3 is a plan view, and FIG. 3 is a front view showing a usage state of the branch box.

The branch box 10 for the cable protection tube is entirely made of synthetic resin such as polyvinyl chloride or polypropylene.
A cylindrical box main body 11 and a pair of outer tube connections which are provided at opposite positions on the peripheral wall of the box main body 11 and which are respectively connected to the ends of the outer tube 12 and which are formed of ABS resin or the like. Socket 13 and outlet 14 for connecting an outer pipe, a branch pipe connection port 16 provided in the branch direction of the branch cable and connected to an end of a branch pipe 15, and a bottom for closing the bottom opening of the box body 11 A lid 17, a riser pipe 18 connected to the upper opening of the box body 11, and a plurality of sheath pipe connections provided inside the outer pipe connection ports 13 and 14, respectively, and the ends of the sheath pipes 19 are connected to each other. A sheath tube support member 21 having a mouth 20.

A rib pipe having a high flat strength is used for the outer pipe 12, and the outer pipe connecting ports 13 and 14 provided in the box main body 11 correspond to the end shape of the outer pipe 12 to be connected. It is formed in a mouth shape or a spigot shape. The connection ports 13 and 14 and the outer tube 12 are connected to each other via a rubber ring 22 attached to the outer periphery of the outlet side.

Further, the branch pipe 15 has a diameter corresponding to the sheath pipe 19 on the main line side, and the number of branch pipes 15 corresponding to the number of branch cables is used. The number of branch pipe connection ports 16 corresponding to the number is provided on the peripheral wall of the box main body 11. The branch pipe 15 and the branch pipe connection port 16 may be connected by using a joint 23, for example, as shown in FIG. 2, and a connection method in which one side is an opening and the other side is a receiving port is also adopted. be able to. Further, a rubber ring may be used to connect the two,
Adhesion or the like can also be adopted.

The connection ports 13, 14 and 16 may be integrally formed with the box main body 11, and each connection port forming member is attached to the connection port mounting portion formed in the box main body 11 by adhesion or the like. The main body 11 and each connection port may be integrated.

The bottom lid 17 is attached to the bottom opening of the box main body 11 in a sealed state by adhesion or the like, and a protective material for enhancing impact resistance can be provided if necessary. Further, a lid having water-stopping property is attached to the upper end opening of the rising pipe 18, and in a state where the branch basin 10 is buried in the ground, a protection provided with a pedestal portion 24 is provided so as to cover the upper part of the rising pipe 18. The lid 25 is installed.

The sheath pipe support member 21 is a disc-shaped member having a short pipe attached to a through hole provided in the disc pipe-like member, and the end portion of the sheath pipe 19 is fitted into the short pipe. Thus, the sheath tube 19 is supported.

As shown in FIG. 3, when a part of the cable is pulled into the building from the cable protection pipe 27 laid between the concrete manholes 26, the branch box 10 is buried at the cable branch position, The outer pipe 12 is connected to the outer pipe connecting receptacle 13 and the outer pipe connecting outlet 14, and the branch pipe 15 is connected to the branch pipe connecting port 16 and each sheath pipe connecting port of the sheath pipe supporting member 21. 20 for each sheath tube
Are connected to each other. The concrete manhole 26 is connected to an outer pipe or the like forming the cable protection pipe line 27 in the same manner as in the conventional case.

At this time, since the entire branch rod 10 is made of synthetic resin, it is much lighter than the conventional concrete branch rod, so that the installation work of the branch rod 10 can be easily performed. Furthermore, since a connection port is provided at a predetermined position of the branch rod 10 and the branch rod 10 and the outer pipe 12 can be easily connected via the rubber ring 22,
Connection work for outer pipes and the like can be performed extremely easily. The branch connection between the trunk cable and the branch cable, the connection of the sheath pipe, and the pulling of the cable through the sheath pipe can be performed in the same manner as in the conventional case.

Further, in this embodiment, the branching direction of the branch cable is orthogonal to the laying direction of the trunk side cable, but the branching direction of the branch cable can be inclined with respect to the trunk side. The branch pipe connection port can be provided in any direction such as degrees, 45 degrees, and 60 degrees. Further, branch pipe connection ports can be provided on both sides in the laying direction of the main cable, and a plurality of sets of branch pipe connection ports can be provided on one side of the main line.

FIGS. 4 and 5 show a second embodiment of the branch box for a cable protection tube of the present invention. FIG. 4 is a partial sectional front view of the branch box, and FIG. 5 shows the use state of the branch box. It is a front view. The same components as those of the branch tub shown in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The branch rod shown in this embodiment is preferably a single accommodating unit for allowing a cable to be pulled through independently, which is preferably installed in the upper opening of the box main body 11 formed in the same manner as described above in a state of being separated from other cables. Rise pipe 3 with pipe branch
1 is attached.

The riser pipe 31 has a pair of main line side connection ports 33, 33 for connecting the single main line side accommodating pipe 32.
And a branch-side connection port 34 for connecting the branch-side single housing pipe, and a rubber ring mounting groove 35 is provided on the inner periphery of each connection port formed in a receiving shape. ing. That is, the individual accommodating pipes are formed so that they can be connected only by inserting the end portion of the individual accommodating pipe into the connection port in which the rubber ring 36 is mounted in the rubber ring mounting groove 35.

As described above, when laying a cable to be accommodated individually, the stand-up pipe 18 in the branch box 10 shown in the first embodiment is simply replaced by the stand-up pipe 31 corresponding to the single-container pipe connection. Since it is possible to lay a storage cable, it is easier to handle than a conventional concrete branch stile, and work on the site can be reduced.

The rising pipe 31 and the connection ports 33, 3 are
Since the structure of the connection portion with 4 can adopt a general synthetic resin pipe connection structure, its detailed description and illustration are omitted.

[0022]

As described above, according to the branch box for a cable protection tube of the present invention, since it is entirely made of synthetic resin, the weight is significantly reduced, and the workability in handling, transportation, installation, etc. is improved. Therefore, the construction cost can be reduced. Further, the outer pipe can be connected to the branch stub only by inserting it through the rubber ring, and it can be performed very easily. Further, since the branch side has a smaller diameter than the main line side and only the necessary number is provided, the cost is lower than when branching with the same structure as the main line side.

[Brief description of drawings]

FIG. 1 is a partial sectional front view of a branch box showing a first embodiment of the branch box for a cable protection tube of the present invention.

FIG. 2 is likewise a plan view of the branch basin.

FIG. 3 is a front view showing a usage state of the branch tub.

FIG. 4 is a partial cross-sectional front view of a branch box showing a second embodiment of the branch box for cable protection tubes of the present invention.

FIG. 5 is likewise a front view showing a usage state of the branch box.

[Explanation of Codes] 10 ... Branch Mouth, 11 ... Masu Main Body, 12 ... Outer Pipe, 13 ... Outer Pipe Connection Receptacle, 14 ... Outer Pipe Connection Outlet, 15 ... Branch Pipe, 1
6 ... Branch pipe connection port, 17 ... Bottom lid, 18 ... Standing pipe, 1
9 ... Sheath pipe, 20 ... Sheath pipe connection port, 21 ... Sheath pipe support member, 2
2 ... Rubber ring, 23 ... Joint, 24 ... Pedestal part, 25 ... Protective lid, 26 ... Concrete manhole, 27 ... Cable protection pipe line, 31 ... Rise pipe, 32 ... Single accommodation pipe, 33
... Main line side connection port, 34 ... Branch side connection port, 35 ... Rubber ring mounting groove, 36 ... Rubber ring

Claims (2)

[Claims] 1. A branch box for a cable protection tube made of synthetic resin, which is installed in a cable branch portion of a cable protection tube in which a plurality of sheath tubes are inserted inside the outer tube and a cable is inserted inside the sheath tube. The cable branch box is a pair of outer tubes including a cylindrical box body and a receiving port or a spout provided on the peripheral wall of the cell body and the end portion of the outer tube is connected via a rubber ring. A connection port, a branch pipe connection port provided in the branch direction of the branch cable and connected to an end of a branch pipe having a diameter corresponding to the sheath pipe, a bottom lid closing the bottom opening of the measure body, and the measure body A riser pipe connected to the upper opening of the outer pipe, and a sheath pipe support member having a plurality of sheath pipe connection ports provided inside the outer pipe connection port and connected to respective ends of the sheath pipe. A branch box for cable protection pipes. 2. The rising pipe includes a pair of trunk-side connection ports that connect the ends of the single accommodating pipes for individually passing the cables, and a branch-side connection port that connects the single accommodating pipes on the cable branch side. The branch box for a cable protection pipe according to claim 1, further comprising: