JP2003299218A - Branch leader head for cable protecting tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch leader head for a cable protecting tube of which the workability in handing, transportation, installation and the like is improved by reducing the weight of the branch measure and which is easily connected to an external tube. <P>SOLUTION: The branch lead head for the cable protecting tube is made of a synthetic resin and comprises a cylindrical lead head body 11, a pair of trunk-line side external tube connecting ports 13, 14 formed in a leader head body peripheral wall, and each composed of a faucet or a spigot to which the end of an external tube is connected via a rubber ring, a branch external tube connecting port 16 formed in the branch direction of a branch cable, and composed of a faucet or a spigot to which the end of the branch external tube is connected via a rubber ring, a bottom lid 17 for blocking the bottom opening of the leader head body, a rising tube 18 connected to the upper opening of the leader head body, and sheath tube support members 21 mounted inside the connecting ports and having a plurality of sheath tube connecting ports 20 to which ends of sheath tubes are connected. <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, it is installed at a portion where a cable is branched in a conduit structure of a cable protection pipe used when laying a cable such as an optical fiber and a power line. A branch for a cable protection tube.

[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 pulling the cable into each building, install a special branch box in the middle of the cable protection pipeline and connect the branch outer tube to this branch box to pull the branched cable into the building. There is.

[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.

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 to the branch box. The purpose is to provide a Masu.

[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 a synthetic resin, which is installed at a cable branch portion of the cable protection tube, wherein the cable branch box is provided with a cylindrical box body and an end of the outer tube provided on a peripheral wall of the box body. A pair of trunk side outer pipe connection ports, each of which is connected via a rubber ring and formed of a receiving port or a spigot, and an end of the branch outer pipe, which is provided in the branching direction of the branch cable, is connected through the rubber ring. A branch outer pipe connection port consisting of a receiving port or a spout, a bottom lid closing the bottom opening of the box body, a rising pipe connected to the upper opening of the box body, and provided inside each of the connection ports. It has a plurality of sheath pipe connection ports to which the ends of the sheath pipe are respectively connected. It is characterized by comprising a tubular support member.

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. 4 and 5 show a modified example of the branch box, FIG. 4 is a partial sectional front view of the branch box, and FIG. 5 is a plan view 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 trunk lines provided at opposite positions on the peripheral wall of the box main body 11 and connected to respective ends of the trunk-side outer pipes 12 which are formed of ABS resin or the like. Side outer pipe connecting port 13 and trunk side outer pipe connecting port 14 and branch outer pipe connecting port 16 provided in the branch direction of the branch cable and connected to the end of the branch outer pipe 15.
A bottom lid 17 for closing the bottom opening of the box main body 11, a rising pipe 18 connected to the upper opening of the box main body 11, and a sheath pipe 19 provided inside each of the connection ports 13, 14, 16. And a sheath pipe support member 21 having a plurality of sheath pipe connection ports 20 to which the respective ends are connected.

A rib pipe having a high flat strength is used for each of the outer pipes 12 and 15, and each of the connection ports 13, 14 and 16 provided in the box main body 11 is connected to each of the outer pipes 1 to be connected.
It is formed in a receptacle shape or a spigot shape corresponding to the shapes of the 2 and 15 ends. Each of these connection ports 13, 14, 1
6 and each of the outer tubes 12 and 15 are connected to each other via a rubber ring 22 attached to the outer circumference of the outlet side.

The connection ports 13, 14, 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 the state where the branch basin 10 is buried in the ground, the pedestal 23 is provided so as to cover the upper part of the rising pipe 18. The lid 24 is installed.

The sheath pipe support member 21 is a disc-shaped member having a short pipe attached to a through hole provided as a sheath pipe connection port 20, and the end of the sheath pipe 19 is fitted into the short pipe. Thus, the sheath tube 19 is supported.

As shown in FIG. 3, when the cable is drawn into the building from the cable protection conduit 26 laid between the manholes 25 made of concrete, the branch box 10 is buried at the cable branch position so that the trunk outside The trunk side outer pipe 12 is connected to the pipe connection receiving port 13 and the main line side outer pipe connecting port 14, respectively, and the branch outer pipe 15 is connected to the branch outer pipe connecting port 16 and each sheath pipe supporting member. 21 for each sheath pipe connection port 20
The respective sheath tubes 19 are connected to. The concrete manhole 25 is connected to an outer pipe or the like forming the cable protection pipe line 26 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. Further, a connection port is provided at a predetermined position of the branch box 10, and the branch box 10 and each outer tube 12,
Since it can be easily connected to 15 via the rubber ring 22, the outer pipe connecting work can be performed very easily. The branch connection between the main cable and the branch cable, the connection of the sheath pipe, and the pulling of the cable into the sheath pipe can be performed in the same manner as in the past.

Further, in the branch rod shown in FIGS. 1 to 3, the branching direction of the branch cable is orthogonal to the laying direction of the main cable, but as shown in FIG. 4 and FIG. The branching direction of the cable can be inclined with respect to the main line side, and the branch outer pipe connection port can be provided in any direction such as 30 degrees, 45 degrees, and 60 degrees. Further, it is possible to provide branch outer pipe connection ports on both sides in the laying direction of the main cable, and it is also possible to provide a plurality of branch outer pipe connection ports on one side of the main line.

6 and 7 show a second embodiment of the branch box for a cable protection tube of the present invention. FIG. 6 is a partial sectional front view of the branch box, and FIG. 7 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 pulling a cable by itself, which is preferably laid in the upper opening of the box 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 a 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 the work on site can be reduced.

The riser pipe 31 and the connection ports 33, 3
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.

[0021]

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.

[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 showing a modified example of the branch box.

FIG. 5 is a plan view showing a modified example of the branch box.

FIG. 6 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. 7 is a front view showing a usage state of the branch tub.

[Explanation of symbols]

10 ... Branch Masu, 11 ... Masu main body, 12 ... Trunk side outer pipe, 13
... Main line side outer pipe connection receiving port, 14 ... Main line side outer pipe connecting port, 15 ... Branch outer pipe, 16 ... Branch outer pipe connecting port, 17
... bottom lid, 18 ... rising pipe, 19 ... sheath pipe, 20 ... sheath pipe connection port, 21 ... sheath pipe support member, 22 ... rubber ring, 23 ... pedestal part, 24 ... protective lid, 25 ... concrete manhole,
26 ... Cable protection pipe line, 31 ... Standing pipe, 32 ... Single accommodating 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 trunk lines composed of a tubular box body and a receptacle or spigot provided on the peripheral wall of the box body and connected to the end of the outer tube via a rubber ring. Connect the outer pipe connection port, the branch outer pipe connection port that is provided in the branching direction of the branch cable, and that has the end or end of the branch outer pipe connected via a rubber ring, and the bottom opening of the box body. A sheath pipe having a closing bottom lid, a rising pipe connected to the upper opening of the box body, and a plurality of sheath pipe connection ports provided inside the respective connection ports to which the ends of the sheath pipe are respectively connected. A branch box for a cable protection tube, which is provided with a support member. 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: