JP4232135B2 - Branch method of underground cable and its branch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention allows a cable to be branched from a trunk cable such as a power cable, a cable for CATV, or a cable for cable broadcasting buried in the ground as needed, and efficiently connects an electric wire or a telephone line to a store or a residence. The present invention relates to a method for branching underground cables to be wired and a cable branch used for the branching method, and belongs to power / communication wiring technology.
[0002]
[Prior art]
Enhance the landscape of the road, in order to ensure smooth traffic, cables such as power lines or communication lines that have become mainly be buried in the ground.
In order to supply electric power and communication from the main line cables buried in these underground to stores and residences that are general consumers, the main cables are arranged at intervals of 40 to 50 m along the underground grooves in which the main line cables are stored. A common method is to use an existing handhole, branch the trunk cable in the handhole closest to the store or residence to be wired, and route the branched cable to the store or residence. .
[0003]
The hand hole has a diameter or one side than 1000 mm, typically Ru der large that 1200～1600Mm.
Therefore, that it provides a large number along the underground groove, so restricted in terms of expense in terms of space, that provided in 40~50m intervals as described above.
Therefore , if there is a store or residence of a customer who needs power or communication near the manhole or handhole, it is compared with sending power or communication by branching the cable from the power cable or communication cable. Easy.
[0004]
[Problems to be solved by the invention]
However, in order to send power and communications to stores and residences away from the handhole, it is necessary to dig up the ground for a considerable distance in order to pull the branch cable from the main cable, which requires a considerable work period for the construction of the branch cable. that require expenses.
In addition , since branching is generally performed in the hand hole, it is practically impossible to install such large hand holes at short intervals.
[0005]
In view of the present situation, the present invention shortens the lead-in construction period and facilitates construction when drawing a branch cable from a power and communication trunk cable buried in the ground into a store or a residence as a consumer. It is intended to provide an underground cable branching method and a branching cable used for the branching method.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention provides:
In order to relay the trunk cable buried in the ground, it is composed of a synthetic resin stand pipe and a main body between hand holes arranged at a required interval, and a detachable lid is attached. Divide the pipes to be installed at arbitrary intervals,
In a ring-shaped holding member provided between the vertical pipe in the branch pipe and the main body, a distributor installation table capable of holding a plurality of distributors in parallel is provided so as to be freely removable.
Route the trunk cable through the distributor in the branch,
When branch wiring to the target building, after taking out the distributor from the branch,
The underground cable branching method is characterized in that only a necessary trunk cable is distributed from the distributor and branched.
[0007]
The invention according to claim 2 of the present invention is
A main body made of a synthetic resin provided with a receiving port for receiving the end of a protective tube containing a trunk cable on each opposing side wall;
A synthetic resin stand pipe attached to the upper opening of the main body,
Consists of a lid that is detachably attached to the upper opening of the standpipe,
A plurality of distributors can be held in parallel so that a distributor with a trunk cable connected between the upper opening of the main body and the vertical pipe can be taken out from the upper opening of the vertical pipe. The underground cable branch is characterized by providing a ring-shaped holding member for holding through a distributor installation base .
[0008]
The invention according to claim 3 of the present invention is
In the underground cable branch according to claim 2,
The main subject is
A sleeve of the required length is attached to the receptacle of the protective tube provided on each of the opposing side walls,
It is characterized in that the end of the protective tube can be connected to each sleeve so as to be able to advance and retract within a required range.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the underground cable branch cable according to the present invention will be described below with reference to the accompanying drawings, and an underground cable branching method using the underground cable branch cable will be described.
[0010]
In Fig. 1, the branch for pulling underground cables into buildings such as homes and factories is branched. 1 The branch body (same as branch 1 in the drawing) is made of synthetic resin such as polyvinyl chloride. The branching main body 2, the standing pipe 3 standing on the branching main body 2, and the lid 4 that is detachably attached to the upper opening of the standing pipe 3.
[0011]
The main body 2 is formed of a cylindrical body with a closed bottom portion 2a, and is integrally formed with receiving ports 2b and 2b for receiving end portions of protective tubes that protect the trunk cable on opposing wall surfaces. A drawing pipe connecting portion 2c for drawing the branched branch cable to be drawn into the building is formed on the wall surface on either side between the receiving ports 2b and 2b.
[0012]
Wherein each receptacle 2b, Ru der those ends of the protective tube 9, 9 respectively for protecting the mains cable is connected.
At that time, the sleeves 10 and 10 made of synthetic resin are connected to the receiving ports 2b, and the ends of the protective tubes 9 and 9 are connected to the sleeves 10 so as to be able to advance and retreat. Can be absorbed even if the protective tube 9 expands or contracts somewhat due to fluctuations.
[0013]
In the upper opening of the branching main body 2, the base end portion of the cylindrical vertical tube 3 is inscribed and held with a ring member R for sealing interposed therebetween, and the main body 2 branches off from the vertical tube 3. Between the two, a ring-shaped holding member 5 is provided.
[0014]
A lid receiving member 6 is externally held in the upper opening of the standpipe 3, and the lid 4 is detachably attached to the lid receiving member 6, and the lid 4 is opened as necessary to draw in the branch cable. Ru der those capable of connecting the cables.
In addition , it is preferable that the said vertical tube 3 can adjust height within a required range.
[0015]
A distributor installation base 8 is fixed to the holding member 5 for holding the distributor 7 connected to one end of the branch cable branched from the trunk cable in parallel.
[0016]
The distributor installation stand 8 forms the notch in the plurality of comb-like on the upper edge of the apparent to the plate-like body in Figure 1, Ru der those for holding respective distributor 7 to the notch.
By adopting such a configuration, when the branch cable is drawn into the building, the distributor 7 can be easily taken out from the main body 2 that branches.
[0017]
The structure of the distributor installation base 8 is not particularly limited as long as the distributor 7 can be held in an aligned state and can be taken out from the main body 1 if necessary. In the state where the distributor 7 is held in the position 8, the distributor installation base 8 itself may be taken out from the main body 1.
[0018]
As shown in FIG. 3, the branching rod 1 having such a structure is drawn into an arbitrary interval, that is, in the future, between the handholes 11 that relay trunk cables such as power cables (the other handhole is not shown). It is to be installed at each point where is expected to be required.
[0019]
As shown in FIG. 4, the hand hole 11 is composed of a box body 11a having an upper opening and a lid 11b attached to the opening. it is to have a size enough to put.
In addition , for example, an insertion hole 11c for inserting a power cable and an insertion hole 11d for inserting a communication cable such as a telephone are formed on a wall surface located on the same axis as the protective tube 9 covering the trunk cable. The insertion hole 11e for inserting a protective tube that converges a plurality of communication cables such as CATV is formed.
[0020]
Branched masu installed in any point 1, from the mains cable branch the cable entry to the building A, Ru der those connected to the distributor 7 provided with one end thereof to the interior.
The cable branched from the main line cable may be either power and / or communication. In this embodiment, a description will be given with a protective tube that converges and holds a plurality of CATV communication cables.
[0021]
For example, the protective tube 9 in which six communication cables (three of which are spare cables) is converged is separated into two at the point where the branch 1 is made .
One end of the protective tube 9 of hand hole 11 side (the left side in FIG. 2) to the sleeve 10, also Ru respectively is inserted and held one end of the other protective tube 9 separating the (right side in FIG. 2) to the sleeve 10.
Three communication cables C ₁ out of the six held converged , C ₂ and C ₃ are connected to distributors 7, 7, 7, respectively, and the right communication cable C ₁ is connected via the distributor 7. , C ₂ and C ₃ are connected to integrate the trunk cable.
[0022]
In this state, in order to draw the cable into the building A in FIG. 3, the lid of the branch 1 that is closest to the building A is opened, and the distributor 7 to which the necessary communication cable, for example, the cable C ₁ is connected, is opened. branch mass 1 bring out by appropriate means to the outside.
Then , in the distributor 7, the communication cable C ₁ And retractable cable X ₁ Together to connect the, one end of the pull cable X _1, are inserted through the pull tube 12, the drawer in building A, in which branches the trunk cable.
[0023]
In this embodiment, the protection tube 9 is connected to the branching branch 1 by connecting the sleeve 10 to the receiving port 2b formed integrally with the branching main body 2, and the sleeve 10 via a rubber ring. one end of the protective tube 9 that are freely by interpolation holding retractable.
Therefore , since the inner pipes 13, 13... For individually holding the communication cables are accommodated and held in the protective tube 9, the tip portion of each inner pipe 13 is converged and held by the bell mouth 14. in but it may also be is inserted in a protective tube 9.
In addition, the mounting means no particular restriction is not name.
The protective tube 9 is preferably a synthetic resin double wave tube, a rib tube, or a straight tube. Further , the inner tube 13 is preferably a corrugated tube made of synthetic resin or a straight tube.
[0024]
The size of the branch mass 1, although basically without limitation, considering the ease and economy of installation, have preferably those cylindrical diameter of about 300 to 400 mm.
Further, although the distributor installation base 8 has been described as a plate-like body, for example, on the ring-shaped holding member 5, the bottom side of the semicircular plate body whose bottom side is smaller than the diameter of the standpipe 3 is arranged upward. It is also possible to form a plate-like body integrally with the plate-like body as a distributor installation base.
[0025]
Furthermore, the distributor can identify the distributor corresponding to the trunk cable so that the desired distributor can be immediately taken out from the plurality of distributors when the branch cover is opened and taken out to the outside. It is preferable that it is configured to be able to.
[0026]
【The invention's effect】
In the underground cable branching method according to the present invention, branching branches are arranged at arbitrary intervals between handholes arranged at a relatively long distance for relaying a trunk cable, and provided in each branching branch. Branch the trunk wiring work in order to route the trunk cable through the distributor, branch out the distributor, take out the distributor, distribute the target trunk cable, and branch the wiring into the target building. Ru can be carried out in the mass of the outside.
Moreover , since the branch wiring from the main line cable is performed at the nearest branch, the lead-in line can be greatly shortened, and the construction period can be shortened and the construction cost can be reduced.
[0027]
In particular, in this method, the distributor with the trunk cable wired can be taken out in the branch, so that only the necessary distributor can be taken out for the branch wiring. Can be greatly improved.
[0028]
Also, the branch cable of the underground cable of the present invention is a branch made of synthetic resin. A distributor is installed in the main body so that the distributor can be taken out from the upper opening, and the branch line is branched through the distributor. retrieves the cable that requires from the cable, Ru can branch.
Moreover, by reducing the branching masu body, can also be trouble installing without a narrow walkway width, to shorten the construction period due to the cable branch as much as possible, it is possible to also reduce of construction cost.
[0029]
In particular, when branching only the necessary cables from the trunk cable, this branch can branch out the distributor connected to the trunk cable easily and easily outside the main body. It has a great effect in that it can be easily performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an outline of a branching branch according to the present invention.
FIG. 2 is an explanatory diagram showing a usage state of the branching branch of FIG. 1;
FIG. 3 is a conceptual diagram showing the underground cable branching method according to the present invention.
FIG. 4 is an explanatory diagram of a handhole.
[Explanation of symbols]
1 branch (Branch body)
2 Main branch 3 Standing tube 4 Lid 5 Holding member 6 Lid receiving member 7 Distributor 8 Distributor installation base 9 Protection cable for trunk line cable 10 Sleeve 11 Hand hole 12 Retracting pipe

Claims (3)

In order to relay the trunk cable buried in the ground, it is composed of a synthetic resin stand pipe and a main body between hand holes arranged at a required interval, and a detachable lid is attached. Divide the pipes to be installed at arbitrary intervals,
In a ring-shaped holding member provided between the vertical pipe in the branch pipe and the main body, a distributor installation table capable of holding a plurality of distributors in parallel is provided so as to be freely removable.
Route the trunk cable through the distributor in the branch,
When branching to the target building, after removing the distributor from the branch,
A branching method for underground cables, wherein only necessary trunk cables are distributed from the distributor and branched. A main body made of synthetic resin with a receiving port for receiving the end of a protective tube containing a trunk cable on each opposing side wall;
A synthetic resin stand pipe attached to the upper opening of the main body,
Consists of a lid that is detachably attached to the upper opening of the standpipe,
A plurality of distributors can be held in parallel so that a distributor connected with a trunk cable can be taken out from the upper opening of the vertical pipe between the main upper opening and the vertical pipe. Underground cable branches through a distributor installation stand, which is provided with a ring-shaped holding member. The main subject is
A sleeve of the required length is attached to the receptacle of the protective tube provided on the opposite side wall,
The underground cable branch according to claim 2, wherein the end of the protective tube can be connected to each sleeve so as to be able to advance and retract within a required range.

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