JP2709440B2 - Perforated protective tube for cable burial - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous protection tube for burying cables used for protecting cables when various transmission cables for power, communication and television broadcasting are buried integrally in the ground. (Hereinafter simply referred to as a porous protective tube).

[0002]

2. Description of the Related Art A perforated protective tube for burying a transmission cable in which a connected perforated protective tube is buried in the ground and a cable is inserted into a cable insertion hole of the perforated protective tube, as shown in FIG. Grooves 9 are dug along the pits, and pits 10, 10 called hand holes are provided at key points. At the bottom of the groove 9 between the pits 10, 10, porous protective tubes A, A,. Of porous protective tubes B, B
・ Pit 10, 10 by connecting each other
After the spaces are communicated with the porous protective tubes B, B,..., The grooves 9 are backfilled. Of the cables inserted into the porous protective tubes B, the trunk line passes through the pit 10 and the branch line passes through the pit 1
It is forwarded via a switchboard within 0, or is branched and connected. When it is necessary to fork, a new branch line 14 is drawn out from the handhole and branched to each house.However, if a new branch road is to be established from the handhole to the destination, the construction cost increases if the distance is long, It is better to diverge from the part on the way away from the pit. When branching from a part on the way away from the pit, a porous protection tube is dug out once, a new small pit 11 'is provided there, and the branch is made from the small pit 11'. On the other hand, at the time of burial, small pits are provided in advance at planned or expected locations or at predetermined intervals, and if branching becomes necessary in the future, attempts are made to use the small pits efficiently. Have been. Also, for branching the cable,
For example, a Y-shaped branch pipe described in Japanese Patent Publication No. 63-43514 and an L-shaped side groove having a branch described in Japanese Patent Publication No. 4-322114 are known.

[0003]

In the case of a perforated pipe, it is very inefficient to construct a small pit by excavating each time it branches, and it requires enormous construction costs. On the other hand, if you have many small pits in advance, you do not need to dig back,
Increases in costs are inevitable, and the number of small pits that are not used at all is not small, so it must be said that there is much waste. In addition, since the L-shaped side groove having the Y-shaped branch pipe and the branch path is made for the purpose of branching only one kind of cable, it is used for power, communication, and television broadcasting as in recent years. When it is necessary to branch multiple types of cables, it is difficult to cope without combining multiple types, and if the combination is shifted, it is difficult to sort the branched cables into sets and pull them into each household And workability is poor. In particular, in the L-shaped gutter, the cable is arranged near the road surface, so that the cable is directly affected by the vibration caused by the traffic of a large vehicle. The purpose of use is completely different from what is buried in.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a plurality of types of cables can be branched from a cable buried path formed deep underground, cable insertion holes are provided in a plurality of rows and in multiple stages, and the cross-sectional shape is substantially rectangular. The porous protective tube has a structure in which at least one surface of the outer periphery has a plurality of cable outlets that individually and independently communicate with the outside with respect to each of the cable insertion holes formed along the surface. Due to the continuous connection, a branch tube can be protruded from the cable outlet in a direction inclined at an angle of about 40 degrees with respect to the cable insertion hole. The branch tube can be formed integrally with the cable outlet, can be detachably attached to the cable outlet, and can be replaced with a closing plate that is detachable from the cable outlet. In addition, the cable outlets, which are independently connected to the outside in all of the cable insertion holes located on the uppermost row and both sides, are closed with a detachable closing plate, and the closed cable outlets are closed. By removing the blocking plate from and replacing it with a branch tube oriented at a direction inclined at an angle of about 40 degrees to the cable insertion hole, the cable, from any cable insertion hole located on the top row and both sides,
It is desirable to remove the closing plate and replace it with the branch tube so that the cable can be pulled out from the branch tube.

[0005]

[Function] If the cable is digged until the cable outlet is exposed, a plurality of types of cables can be pulled out from the multiple cable outlet. In addition, by providing an inclined branch pipe at the cable outlet, the cable can be easily pulled out, and the number and arrangement of the outlets can be changed by replacing the closing plate and the branch pipe with the cable outlet. Can be rearranged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a porous protective tube according to the present invention will be described with reference to the drawings. FIG. 1 shows the appearance of the porous protective tube A, and FIG.
Shows the respective cross-sections.
It is made of porcelain and has a prismatic shape with rounded corners on the whole surface, and a total of six cable insertion holes 1, 1 ... By reducing the thickness of the outer peripheral surface of the intermediate portion along the cable insertion hole, the weight is reduced. On the upper side, three cable outlets 2, 2, 2 communicating with the upper three cable insertion holes 1, 1, 1 adjacent to the upper side are opened,
The cable outlets 2, 2, 2 respectively have branch tubes 3,
3, 3 are integrally protruded from the cable insertion hole 1 at an angle of approximately 40 degrees. A rubber blind cap 4, 4, 4 is detachably attached to each of the branch tubes 3, 3, 3. In the center, bolt insertion holes 5,
5 are penetrated, and holes for positioning the packing are formed in the end face.

As shown in FIG. 3, the porous protective tube A thus formed can be inserted and connected between the conventionally used porous protective tubes B, B via a packing 7, and these porous protective tubes A can be connected to each other. A and B are formed according to a well-known perforated protection tube connecting method, similarly to the case where the perforated protection tubes A and A are connected to each other.
They are connected by extension bolts 8,8. When constructing,
As in the conventional case, a pit 10 called a hand hole and a small pit 11 smaller than the pit 10 are provided at important points of the groove 9 dug along the transmission path.
0, a groove 9 is dug between the small pits 11, and a plurality of porous protective tubes A are connected and buried in the groove 9 for each of a plurality of continuous porous protective tubes. As a result, on the transmission path, a branch portion 12 composed of the porous protective tube A at a small pitch is secured between the pits 10 and 10 or between the pit 10 and the small pit 11 (FIG. 4). If the porous protective tube A is buried with the blind cap 4 attached to the branch tube 3, the sediment does not flow into the branch tube 3 and becomes clogged. Since the tube 3 is opened, the branch line 13 can be drawn out therefrom. Therefore, it is not necessary to dig a porous protective tube and reinsert the trunk or branch cable 13 each time.
4 and 14 are inserted into, for example, a protection pipe 15 having a manifold portion 15a at the tip and sent out to each door (FIG. 5).

The cable outlet of this embodiment has approximately 4
Since the branch cylinder inclined at 0 degrees is provided integrally, the cable can be smoothly fed in or pulled out, and workability is good. The cable outlet may be such that the branch tube is omitted as shown in FIG. 6 and only the cable outlets 2, 2, 2 are opened, in which case the conventional porous protective tube B is used. Can be manufactured by simply drilling holes in the cable, so it can be handled with only slight modification of manufacturing equipment and process changes, and for branching work, a cable that can be attached to the cable outlet at an angle to the cable insertion hole Use of the guide jig does not impair workability. The branch pipes are not only connected one by one to each cable insertion hole independently, but also as shown in FIG. It is convenient and convenient to divide three types as one set, and it is also useful for earthquake countermeasures. Further, as shown in FIG. 8, the branch tube 3 is provided with cable insertion holes 1, 1,... So that branch lines can be pulled out from all cable insertion holes.
. Can be arranged in three rows and two rows in the upper and lower rows, and the branch cylinders 3, 3,... Can be protruded from the respective cable insertion holes on both sides, and as shown in FIG. Two different directions, a total of 12 branch tubes 3,3 on both sides
.. protruding to allow the cable to be freely pulled out in both directions, and a branching cable can be introduced from the pit near the branching part.

[0009] The above description is a porous protective tube having six cable insertion holes. Therefore, if the vertical type is arranged in three vertical rows and two horizontal rows, all the cable insertion holes are formed on the upper surface or both sides of the outer peripheral surface. It is possible to set cable outlet holes for all cable insertion holes because it is adjacent to the surface.However, since cables are not usually pulled out from the lower surface, total three vertical and three vertical rows are required. In a porous protective tube having nine cable insertion holes, cable extraction holes can be secured only for at most seven cable insertion holes. In this case, as shown in FIG. 9, one pattern is provided at the center of the upper surface and three patterns are provided on both sides, three patterns are formed on the upper surface, and two patterns are formed on both sides, and two patterns are formed on the upper surface. There is a pattern in which two are provided in either one and three in the other, but it would be ideal to select either the pattern a or b.

The embodiments described so far have a structure in which the branch tube is integrally provided at the cable outlet, so that products having different combination patterns such as the position and number of the cable outlet holes and the projecting direction of the branch tube are provided. Must be prepared, but if the branch cylinder is detachably provided, the combination pattern thereof can be freely selected and changed. That is, a cable outlet is provided for each of the cable insertion holes adjacent to the upper side surface and both the left and right side surfaces, and a closing plate and a branch tube are prepared for each cable outlet, and the closing plate is provided. A wide variety is produced by the selection of the branch tube and the branch tube, and the inclination direction is not limited, so that any branch pattern can be accommodated. Such a modification will be described.

The porous protective tube shown in FIG. 10 and FIG.
Are bundled in two horizontal rows and three vertical rows, and abutting plates 17 for forming a connection surface orthogonal to the axial direction of the pipes are provided on both end edges of the bundled pipes 16, 16. 17
The contact plate 17 has pipes 16, 16,.
・ Through-holes 18 and 1 for cable insertion communicating with the through-holes
, Small through holes 19, 19 for bolt insertion, and holes 20, 20,... For positioning the packing, and a cable exposed on the left or right side of each pipe 16, 16,. The main body is made of a metal having windows 21, 21... Serving as draw-out ports, and a closing plate 22 or a branch cylinder 23 which is detachable from each of the windows 21, 21. The closing plate 22 is in close contact with the outer peripheral surfaces of the pipes 16, 16,..., And has a size and a shape that completely covers the cable lead-out window, and has screw holes 24, 24 provided around the window 21.・ ・ It can be screwed using
The branch tube 23 has a cable outlet opening in the center of a base plate 23a having the same outer shape as the closing plate 22, and a tubular portion 23b protruding outward from the cable outlet. Using the holes 24, 24, screws 25 can be used. The branch tube 24 and the closing plate 22 are also made of metal, and the main body and the branch tube and the closing plate are coated with a resin.

In the porous protective tube formed as described above, for example, all windows are closed when buried, and a branch tube is attached when branching is necessary, or initially only at the center of both sides. Attach a branch tube so that the two cables are branched, and close the other windows. When there is a request to increase the number of branch cables, replace the blocking plate with the branch tube and change the branch tube. Can be added. By preparing a plurality of closing plates and branch tubes in one main body thereby, it is possible to cope with a plurality of variations, and not only the pattern can be changed, but also the drawing direction can be freely selected. Inclination angle and direction (including the direction perpendicular to the outer peripheral surface and the horizontal direction)
May be changed as appropriate. Further, since it is made of metal, it can be easily formed only by welding, and as shown in FIG. 12, can be applied to a three-row, three-row, perforated protective tube. In this case, FIG.
As shown in, one cable outlet is provided at the center of the upper surface and three at the left and right, and they are closed with a closing plate,
By replacing the closing plate with the branch cylinder as necessary, the cable from the cable insertion hole which is close to the upper surface and all the right and left side surfaces in the arrangement of the type a shown in FIG. Withdrawal becomes possible. In addition, the porous protective tube of the present invention has at least one surface provided with a number of cable outlets corresponding to the number of cable insertion holes formed along the surface, and a cable inserted through the cable insertion holes. It does not deny that it is formed on the back side, and materials other than pottery and metal,
For example, a synthetic resin or a combination of a plurality of types of materials may be used. In the case of a metal or a synthetic resin, not only a pipe or a plate is formed by welding or bonding, but also a casting or an injection molded product. Can be. Further, the shape is not limited to the embodiment, and may be a porous protective tube for a bent portion, or a porous protective tube that can be simultaneously connected to a plurality of porous protective tubes in order to correspond to a plurality of stacked or side-by-side porous protective tubes. And various sizes. In addition, the porous protective tube can be provided with an engagement means in consideration of multi-stacking, and furthermore, between the adjacent cable insertion holes, the cable inserted into the central cable insertion hole,
It is also possible to form a switching path for transfer in the middle of the pits in the adjacent insertion hole allocated for the same type of cable insertion, and to branch off from the cable outlet communicating with the adjacent cable insertion hole.

[0013]

According to the present invention, a plurality of cables can be branched by connecting them so as to be inserted between the conventional porous protective tubes. Digging back, finding a cable outlet for branching, and pulling out the branching cable from there, it's easy. In addition, if the number of branch tubes is changed or the arrangement is changed by exchanging the closing plate and the branch tube, all branch conditions can be satisfied with only one main body and two types of members. By burying such a branch protective tube, the burial and branching work is much more difficult than the conventional method of constructing a small pit or combining multiple Y-shaped branch tubes. And the reliability is high because the branch part does not shift.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of a porous protective tube according to the present invention.

FIG. 2 is an explanatory view showing a cross section of a column in which a blind cap is removed in FIG. 1;

FIG. 3 is an explanatory diagram of a branch example.

FIG. 4 is an explanatory diagram of an example of embedding.

FIG. 5 is an explanatory diagram of a modified embodiment.

FIG. 6 is an explanatory diagram of a modified embodiment.

FIG. 7 is an explanatory diagram of a modified embodiment.

FIG. 8 is an explanatory diagram of a modified embodiment.

FIGS. 9A and 9B are explanatory views of a branch pipe projecting pattern.

FIG. 10 is an explanatory diagram of a modified embodiment.

FIG. 11 is an explanatory diagram of a modified embodiment.

FIG. 12 is an explanatory diagram of a modified embodiment.

FIG. 13 is an explanatory diagram of a modified embodiment.

FIG. 14 is an explanatory view showing a conventional example of burying.

[Explanation of symbols]

A · · · perforated protective tube (with cable outlet), B · · ·
Perforated protective tube (without cable outlet), 1. Cable insertion hole, 2. Cable outlet, 3, 3 ', branch tube, 4, blind cap, 5, bolt insertion hole, 6.
Holes for packing positioning, 7, packing, 8. addition bolts, 9 grooves, 10 pits (hand holes), 11, 11 'small pits, 12 branch parts, 1
3. Cable, 14. Branch line, 15 Protection pipe, 15a Manifold part, 16 pipe, 17
..Abutment plate, 18 ·· through hole, 19 ·· small through hole, 20 ···
Packing positioning hole, 21 Window, 22 Blocking plate, 23 Branch cylinder, 23a Base plate, 23
b..Cylinder, 24..Threaded hole, 25..Screw.

Claims (4)

(57) [Claims] 1. A porous protective tube having a plurality of rows of cable insertion holes formed in multiple rows and having a substantially rectangular cross-sectional shape, wherein the cable insertion holes are formed on at least one surface of the outer periphery along the surface. A cable-buried porous protective tube with multiple cable outlets that individually and independently communicate with the outside. 2. The cable-embedding porous protective tube according to claim 1, wherein a branch pipe is integrally provided at the cable outlet in a direction inclined at an angle of about 40 degrees with respect to the cable insertion hole. 3. The cable outlet, a closing plate for closing the outlet, and approximately four holes with respect to the cable insertion hole.
The porous protection tube for burying a cable according to claim 1, wherein one of the branch cylinders directed to the direction inclined at an angle of 0 degrees is selected, and the selected one is detachably provided. 4. A cable pull-out port independently and externally connected to all of the cable insertion holes located on the uppermost row and both sides is closed with a detachable closing plate, and the closed cable pull-out port is closed. 2. The cable burial according to claim 1, wherein the cable can be pulled out of the branch tube by removing the closing plate from the cable and replacing it with a branch tube oriented in a direction inclined at an angle of approximately 40 degrees with respect to the cable insertion hole. Protection tube.