JP4446954B2 - Drainage tool for cable and drainage treatment method for cable - Google Patents

Description

  The present invention relates to a cable drainer and a cable drainage processing method, and more particularly to a cable drainer and a cable suitable for preventing rainwater or the like from being transmitted through the cable and entering a cable connection port of a cable connection box or the like. The present invention relates to a water draining method.

  In recent years, with the spread of the Internet, FTTH (Fiber To The Home), which can transmit a high-speed and large-capacity signal to a home or office using an optical cable (optical fiber), has attracted attention. As a method of laying an optical cable up to a building such as a home or office, a method of laying a multi-core optical cable using an overhead line like a conventional metal telephone line is the mainstream. From the overhead line to the building, multi-core optical cables are distributed by connecting one-core or two-core optical drop cables via optical cable closures (optical cable connection boxes).

  Conventionally, when such an optical cable closure is used by being attached to a suspension line passed between utility poles, as shown in FIG. 6A, the optical cable is parallel to the suspension line 150 and the optical cable closure 100 (hereinafter, “ (I.e., the optical cable is introduced into the closure 100 perpendicular to the cable inlet of the closure 100). Therefore, for example, in order to prevent rainwater from entering the closure 100 through the optical cable, the cable insertion hole is sealed watertight by the grommet 105 provided at the cable introduction port of the closure 100, and FIG. As shown in FIG. 3, a draining process (a process of introducing the optical cable into the closure 100 after bending the optical cable into a U shape) is performed in the vicinity of the closure 100.

  In addition, in Patent Document 1 below, in order to stabilize the output characteristics at the time of rainfall of the distribution line operation state monitoring sensor that obtains the voltage of the distribution line from the voltage that is attached to the distribution line and divided into the built-in electrodes, A drainer made of a hood or the like is provided in the vicinity of the lead-out portion of the distribution line from the cable or the lead-out end of the optical fiber cable for transmission, and the drainer between the sensor surface and the surface of the distribution line Disclosed is a distribution line operation state monitoring sensor that prevents the surface of the surface from conducting electricity through the water film so that the water film does not stretch between the two, thereby preventing potential fluctuations on the sensor surface that affect the detected voltage. Has been.

Further, in Patent Document 2 below, a communication line such as an electric wire or a telephone line or an optical cable is quickly and surely supported by a one-touch operation without requiring much time and effort in the groove block. In order to carry out wiring work efficiently, support members are installed at predetermined intervals in a concrete groove block embedded continuously in the ground, and electric wires or communication lines can be inserted into the upper or lower edge of the support member. There is disclosed a support device such as an electric wire for an underground concrete groove block provided with a desired number of storage recesses into which a sleeve tube is inserted from above and below.
JP-A-5-215799 Registered Utility Model No. 3048594

However, in the conventional draining method described above, a gap is generated between the cable inlet of the closure 100 and the grommet 105 due to the hardening of the rubber accompanying the aging of the rubber grommet 105 and the opening and closing of the closure 100 several times. If the optical cable is swayed by the wind during a rainy weather and a gap is formed between the cable introduction port of the closure 100 and the grommet 105, rainwater transmitted through the optical cable enters the closure 100, and the following This causes problems as shown in
(1) The hardware inside the closure 100 is corroded.
(2) When rainwater enters and freezes between the optical cable and the coating, the loss of the optical signal increases, and in the worst case, the optical line is disconnected.

  An object of the present invention is to provide a cable drainer and a cable drainer method that can improve the waterproof effect.

Cables for draining device of the present invention, the cable (1 ₁₎ is waterproof object being introduced (2) enters the water from the cable introducing port lest the attached cable spiral cable draining tool (51 a _1), a spiral-shaped body portion (52 _1), e Bei and fins formed on the circumferential surface of the body portion (53 _1), said fins, protrusions and recesses are said cable It is characterized in that a corrugated shape is formed by alternately forming irregularities extending radially in the radial direction from the center of the draining tool at equal intervals in the circumferential direction .
Here, a spring may be inserted in the body portion along the circumferential direction .

Cables for draining processing method of the present invention, a plurality of cables (1 ₁ to 1 ₃₎ waterproof object (2) of the cable from the cable inlet into the plurality of cables so that water does not penetrate to be introduced A draining method for a cable that performs draining processing by attaching a drainer to the cable, wherein the draining device for cable (51 ₁ ) according to claim 1 or 2 is connected to the waterproof object near the cable inlet of the waterproof object. One piece is attached to each of the plurality of cables at an equal distance from the cable introduction port of the object so that the neighbors come into contact with each other .

Cable draining device and draining treatment method cable of the present invention, the draining device of the fins for cable screw spiral by wavy, rainwater and the waterproofing object transmitted to the surface of the fin to the surface tension it is possible to prevent the entering, an effect that Ru can be on improvement waterproof effect.

The purpose of improving the waterproofing effect is to create a corrugated fin by forming convex and concave portions that radiate radially from the center of the cable drainer radially at equal intervals. Was realized on the peripheral surface of the main body .

Hereinafter, embodiments of the draining tool for cables and the draining method for cables according to the present invention will be described with reference to the drawings.
In the following, the _first to _third optical cables 11 to _{13 having an} outer diameter of 12 mm are introduced into the closure 2 from one side of the optical cable closure 2 (hereinafter referred to as “closure 2”) at an interval of 30 mm. Will be described as an example.

First, the draining method for cables according to the first reference example of the present invention will be described with reference to FIG.
The _first to _ninth cable drainers 11 _{1 to} 11 ₉ used in the cable drainer according to this reference example are shown in FIGS. 1A and 1B with respect to the first cable drainer 11 ₁ . As shown, it has a ring shape and is made of rubber having an inner diameter of 10 mm, an outer diameter of 30 mm, and a thickness of 5 mm.

In the draining method for cables according to the present reference example , as shown in FIG. 1 (c), a plurality of draining tools for cables are attached in a multistage configuration to one optical cable in the vicinity of the cable inlet of the closure 2.
That is, the first optical cable 1 ₁ first to third cable draining device 11 ₁ to 11 ₃ are attached at predetermined intervals, the second optical cable 1 ₂ drainer for fourth to sixth cable ingredients 11 _{4-11 6} is mounted at a predetermined interval, the third optical cable 1 ₃ seventh to ninth cable draining device 11 _{7-11 9} are attached at a predetermined interval.

Thus, for example, FIG. 1 (c) rightward from the first optical cable 1 ₁ of the rainwater flowing towards the closure 2 transmitted a surface third cable draining device 11 _3, a second cable Since it is possible to stop in the order of the drainer 11 ₂ and the first cable drainer 11 ₁ , it is possible to prevent rainwater or the like from entering the closure 2.

As shown in FIG.1 (c), the draining tool for cables of each stage is attached to each of a plurality of optical cables in a row and in contact with each other.
That is, the first, fourth, and seventh cable drainers 11 ₁ , 11 ₄ , 11 ₇ in the first stage are arranged in a row (that is, at an equal distance from the cable inlet of the closure 2). respectively attached to the optical cable ₁ 1 to 1 _3, a second 2-stage, fifth and eighth cable draining device 11 _2, 11 _5, 11 ₈ in a row (i.e., the first, fourth and seventh cable draining device 11 _1, 11 _4, 11 at equal distances from ₇₎ respectively attached to the first to third optical cable ₁ 1 to 1 _3, a third of the third stage, for the sixth and ninth cable The draining tools 11 ₃ , 11 ₆ , 11 ₉ are arranged in a line (that is, at an equal distance from the second, fifth and eighth cable draining tools 11 ₂ , 11 ₅ , 11 ₈ ). They are respectively attached to the ₁ to 1 _3.
The first, fourth, and seventh cable drainers 11 ₁ , 11 ₄ , 11 _{7 in} the first stage and the second, fifth, and eighth cable drainers 11 _{2 in the} second stage are also included. , 11 ₅ , 11 ₈ and the third, sixth and ninth cable drainers 11 ₃ , 11 ₆ , 11 _{9 in} the third stage are in contact with each other. Nine cable drainers 11 _{1 to} 11 _{9 have} an outer diameter (= 30 mm) equal to the interval (= 30 mm) between the _first to _third optical cables 11 to ₁₃ .

As a result, rainwater or the like flows between the first, fourth, and seventh cable drainers 11 ₁ , 11 ₄ , 11 ₇ and the second, fifth, and eighth cable drainers 11 ₂ , 11 ₅ , 11. It is possible to prevent contact with the closure 2 through ₈ and between the third, sixth and ninth cable drainers 11 ₃ , 11 ₆ , 11 ₉ .

Note that the inner diameters (= 10 mm) of the _first to _ninth cable drainers 11 _{1 to} 11 ₉ are the _first to _third optical cables 1 when they are attached to the _first to _third optical cables 11 to 13. ₁ to 1 ₃ and the first to ninth cable draining device 11 ₁ to 11 ₉ dropout and first to ninth draining device for the cable 11 ₁ to 11 ₉ by tightening the first to third optical cable 1 so as to prevent intrusion of rainwater into the gap between the ₁ to 1 _3, is smaller than the outer diameter of the first through third optical cable 1 ₁ to 1 ₃ (12 mm).

Next, a draining method for cables according to a second reference example of the present invention will be described with reference to FIG.
In the cable draining method according to the first reference example described above, since the first to ninth cable drainers 11 _{1 to} 11 ₉ have a ring shape, they are attached to an existing optical cable or after being attached to an optical cable. When replacement is necessary due to a defect, the optical cable must be cut and attached or replaced.
The draining method for cables according to this reference example is for solving this problem.

The cable draining method according to this reference example is described above in that ring-shaped cable drainers (first to ninth cable drainers 21 _{1 to} 21 ₉ ) partially cut in the radial direction are used. This is different from the draining method for cables according to the first reference example .
That is, the first cable drainer 21 ₁ (the cable drainer according to the first reference example of the present invention) used in the cable draining method according to the present reference example is shown in FIGS. 2 (a) and 2 (b). As shown in FIG. 1, the first bolt 25 for fixing a part cut in the radial direction and the cut portion of the _first cable drainer 21 ₁ attached to the _first optical cable 11. ₁ (fixing means), and a point in which a female screw part screwed into the first bolt 25 ₁ is provided in the inner periphery is formed in the cut portion of the _first cable drainer 21 ₁ . And different from the _first to _ninth cable draining tools 11 _{1 to} 11 ₉ used in the cable draining method according to the first reference example described above.
The second to ninth cable drainers 21 _{2 to} 21 ₉ (not shown) are also configured in the same manner as the first cable drainer 21 ₁ .

Since the first to ninth cable drainers 21 _{1 to} 21 ₉ are partially cut in the radial direction, the existing _first to _third optical cables 11 to ₁₃ can be attached or replaced without cutting. Can be.

Mounting method for the first to third optical cable ₁ 1 to 1 ₃ of the first to ninth cable draining device 21 ₁ to 21 ₉ are attached to the first to third optical cable ₁ 1 to 1 ₃ The cut portions of the first to _ninth cable drainers 21 _{1 to} 21 ₉ are fixed with _{first to ninth} bolts 25 _{1 to} 25 ₉ (the second to ninth bolts 25 _{2 to} 25 ₉ are not shown). Otherwise, to the _first to _third optical cables 11 to ₁₃ of the first to _ninth cable drainers 11 _{1 to} 11 ₉ used in the draining method for cables according to the first reference example described above. This is the same as the mounting method (see FIG. 1C).

Note that the cut portions of the _{first to} ninth cable drainers 21 _{1 to} 21 ₉ are formed of the _first to _third optical cables 11 to _{13 that} are unlikely to transmit rainwater or the like, as shown in FIG. It is attached to come up. Thus, the cut portion of the first to ninth cable draining device 21 ₁ to 21 ₉ can be prevented that the rainwater will through.
Further, since the cut portions of the _{first to ninth} cable drainers 21 _{1 to} 219 are fixed using the first to _ninth bolts 25 _{1 to} 25 ₉ , the first to third optical cables ₁₁ to. 1 outer diameter than ₃ can be installed in somewhat larger optical cable.

Next, a draining method for cables according to a third reference example of the present invention will be described with reference to FIG.
In the cable draining method according to the first and second reference examples described above, it is necessary to attach three cable drainers to a single optical cable in a multi-stage configuration (see FIG. 1C). It takes time to install the tool.
The draining method for cables according to this reference example is for solving this problem.

The cable draining method according to the present reference example uses a cable drainer (first to third cable drainers 31 _{1 to} 31 ₃ ) having a spiral shape, and one for each optical cable. The _first to _third cable drainers 31 _{1 to} 31 ₃ are attached to the _first to _third optical cables 11 to _13, respectively. It differs from the draining method for cables according to the first and second reference examples described above.
That is, the first cable drainer 31 ₁ (the cable drainer according to the second reference example of the present invention) used in the cable draining method according to the present reference example has a spiral shape as shown in FIG. and that it has a shape, the first optical cable 1 ₁ used in the first cable draining device 31 ₁ in only attached points between the first and cable draining treatment method according to the second reference example described above Different from the _first cable drainer 11 ₁ , 21 ₁ .
The second and third cable drainers 31 ₂ and 31 ₃ (not shown) are also configured in the same manner as the first cable drainer 31 ₁ .
The first to third dewatering instrument 31 _{1-31 3} cable, for example, (1/2 of the first outer diameter of the optical cable 1 ₁ (= 12 mm)) internal diameter 6 mm, the outer diameter of 10 mm.

Since the first to third dewatering instrument 31 _{1-31 3} cable having a spiral shape, the effect shown below.
(1) Since it can be attached to the _first to _third optical cables 11 to ₁₃ so as to be wound from one end, the attaching operation is easy.
(2) The existing _first to _third optical cables 11 to ₁₃ can be attached or replaced without cutting.
(3) The same waterproof effect as that of the multistage configuration shown in FIG.
(4) Since it is attached to the _first to _third optical cables 11 to ₁₃ so as to be wound from one end, it can be attached to an optical cable having a slightly larger outer diameter than the _first to _third optical cables 11 to _13. it can.

Further, the first to third cable drainers 31 _{1 to} 31 ₃ may be modified as follows.
(A) The first to third springs (not shown) of the steel core are put in the first to _third draining tools 31 _{1 to} 31 ₃ for the cable along the circumferential direction. The tightening force when wound around the optical cables 1 ₁ to 1 ₃ is increased.
(B) The waterproof effect is enhanced by increasing the number of turns of the _{first to} third cable drainers 31 _{1 to} 31 ₃ . By increasing the number of turns, the first to third cable drainers 31 _{1 to} 31 ₃ can be further prevented from falling off the _first to _third optical cables 11 to ₁₃ .
(C) A variety of optical cables can be obtained by creating a drainer for a cable having a large number of windings and cutting the cable to a required length as the first to third drainers 31 _{1 to} 31 ₃ for a cable. (For example, first to third cable drainers 31 _{1 to} 31 ₃ having a large number of windings are attached to an optical cable having a large outer diameter).

Next, a draining method for cables according to a fourth reference example of the present invention will be described with reference to FIG.
In the cable draining method according to the third reference example described above, the first to third cable drainers 31 _{1 to} 31 ₃ have a spiral shape. and transmitted the third draining device 31 ₁ to 31 ₃ of the surface for the cable closure 2 may enter the (FIG. 1 (c) refer) in contemplated.
The draining method for cables according to this reference example is for solving this problem.

That is, the first cable drainer 41 ₁ (the cable drainer according to the third reference example of the present invention) used in the cable draining method according to the present reference example is shown in FIGS. 4 (a) and 4 (b). As shown in FIG. 4, according to the third reference example described above in that it includes a first fin body 43 ₁ formed on the circumferential surface of the spiral first main body portion 42 ₁ and the first main body portion 42 _1. Different from the _first cable drainer 311 used in the cable draining method.
Incidentally, as shown in Fig. 4 (a), the first body portion 42 ₁ of the first cable draining device 41 _1, for example, inner diameter 6mm (first outer diameter of the optical cable 1 ₁ (= 12 mm) 1/2) and an outer diameter of 12 mm. Moreover, the outer periphery of the 1st fin 43 ₁ shall be 32 mm, for example.
The second and third cable drainers 41 ₂ and 41 ₃ (not shown) are also configured in the same manner as the first cable drainer 41 ₁ .

Since the interval between the first and second optical cables 1 ₁ and 1 ₂ adjacent to each other is 30 mm (see FIG. 1C), the first and second cable drainers 41 ₁ and 41 ₂ are connected to When the first and second optical cables 1 ₁ and 1 ₂ are attached in a row, the first and second fins 43 ₁ and 43 ₂ come into contact with each other. The thickness of the first and second fins 43 ₁ and 43 ₂ is Since it is thin, it does not affect the waterproofing effect even if they come into contact with each other.

Since the first to third cable drainers 41 _{1 to} 41 ₃ have a spiral shape, the first to third cable drainers used in the cable draining method according to the third reference example described above. The same effects as the tools 31 _{1 to} 31 ₃ (see (1) to (4) above) can be obtained.

The first to third of the first to third cable draining device 31 ₁ to 31 ₃ are used in the draining process method cable according to a third reference example of the draining device 41 ₁ to 41 ₃ above cable (See (A) to (C) above).

Next, a draining method for cables according to an embodiment of the present invention will be described with reference to FIG.
In the draining method for a cable according to the fourth reference example described above, rainwater or the like is transmitted through the surfaces of the _first to _third fins 43 ₁ to 43 3 due to surface tension or the like, and within the closure 2 (see FIG. 1C). Intrusion into the network is considered.
The draining method for cables according to the present embodiment is for solving this problem.

That is, the first cable drainer 51 ₁ (cable drainer according to one embodiment of the present invention) used in the cable draining method according to the present embodiment is shown in FIGS. 5 (a) and 5 (b). as such, the first fin 53 ₁ formed in a spiral shape of the first body portion 52 ₁ and the first body portion 52 ₁ of the circumferential surface on there is a wavy shape (i.e., a first fin 53 ₁ of the surface is not flat, uneven when viewed from a first optical cable 1 ₁ in the axial direction and has a surface that alternately in the circumferential direction.) in terms, for cable according to a fourth reference example described above It is different from the _first draining tool for cable 41 ₁ used in the draining method.
The first fins 53 ₁ are formed in a corrugated shape by alternately forming irregularities having convex portions and concave portions extending radially from the center of the first cable drainer 51 _{1 in} the circumferential direction. It is said that the shape.
The second and third cable drainers 51 ₂ and 51 ₃ (not shown) are also configured in the same manner as the first cable drainer 51 ₁ .

Since the first to third fins 53 _{1 to} 533 of the first to _third cable drainers 51 _{1 to} 51 ₃ have a wavy shape, rainwater or the like is caused by the surface tension or the like to cause the first to third rainwater. Intrusion into the closure 2 (see FIG. 1C) along the surfaces of the fins 53 _{1 to} 53 ₃ can be prevented.

Since the first to third cable drainers 51 _{1 to} 51 ₃ have a spiral shape, the first to third cables used in the cable draining method according to the third reference example described above. The same effects as the water drainers 31 _{1 to} 31 ₃ (see (1) to (4) above) can be obtained.

Further, the first to third of the first to third cable draining device 31 ₁ to 31 ₃ are used in the draining process method cable according to a third reference example of the draining device 51 ₁ to 51 ₃ above cable (See (A) to (C) above).

In the above, a case where a plurality of optical cables ( _first to _third optical cables 1 ₁ to 1 ₃ ) are introduced into the closure 2 has been described as an example, but also when a single optical cable is introduced into the closure 2. The draining tool for cables and the draining method for cables of the present invention can be used.
In the draining method for cables according to the first and second reference examples , the draining tools for cables at each stage are respectively attached to a plurality of optical cables so that the adjacent ones are in contact with each other. For example, you may attach to the multiple optical cable alternately so that the draining tool for cables of each step may overlap, for example.
Furthermore, although an optical cable has been described as an example, the present invention can also be used for an electric cable, a telephone cable, a television cable, a wired cable, a metal cable, and a pull-in drop cable that are drawn indoors from outside.
Furthermore, although a cable connection box such as a closure has been described as an example of a waterproof object, the cable drainer and the cable drainage processing method of the present invention can be used even in a building retracted place.

  As described above, the cable draining tool and the cable draining method according to the present invention can be used to prevent rainwater or the like from entering the cable through the cable inlet of the cable connection box, for example. .

It is a figure for demonstrating the draining method for cables by the 1st reference example of this invention, (a) is a front view of the _1st draining tool 111 for cables, (b) is the 1st draining for cables. side view showing a state of attaching the tool 11 ₁ to the first optical cable 1 _1, (c) the draining device for the first to ninth cable 11 ₁ to 11 ₉ of the first to third optical cable ₁ 1 to 1 ₃ is a side view showing a state attached to _3. FIG. Is a diagram for explaining a second cable draining treatment method according to Reference Example of the present invention, (a) is a front view of a first cable drainer device 21 _1, (b) is drained for the first cable is a side view showing a state in which the tool 21 ₁ attached to the first optical cable 1 _1. It is a figure for demonstrating the draining method for cables by the 3rd reference example of this invention. It is a figure for demonstrating the draining method for cables by the 4th reference example of this invention, (a) is a front view of the _1st draining tool 411, and (b) is the 1st draining for cables. the ingredients 41 ₁ is a perspective view showing a state attached to the first optical cable 1 _1. It is a figure for demonstrating the draining method for cables by one Example of this invention, (a) is a front view of the _1st draining tool 511, and (b) is the 1st draining tool 51 for cables. ₁ is a perspective view showing a state in which ₁ is attached to a _first optical cable 11. FIG. It is a figure for demonstrating the conventional draining method for cables.

1 ₁ to 1 ₃ optical cable 2 closure 11 ₁ to 11 _9, 21 _1, 31 _1, 41 _1, 51 ₁ cable draining device 25 ₁ volt 42 _1, 52 ₁ main body portion 43 _1, 53 ₁ fin

Claims (3)

A spiral cable drainer (51 ₁ ) attached to the cable so that water does not enter from the cable inlet of the waterproof object (2) into which the cable (1 ₁ ) is introduced,
A spiral body (52 ₁ );
E Bei the fins formed on the peripheral surface of the body portion (53 _1),
The fins are formed in a wavy shape by alternately forming irregularities extending in the circumferential direction at equal intervals in the radial direction from the center of the draining tool for the cable and the concave portion,
A drainer for a cable, characterized in that. The draining tool for cables according to claim 1 , wherein a spring is inserted in the body portion along a circumferential direction. A plurality of cables (1 ₁ to 1 ₃₎ Fit the draining device cable to waterproof the object (2) from the cable introducing port of said plurality of so water does not penetrate the cable to be introduced cable to perform draining process A water draining method,
In the vicinity of the cable inlet of the waterproof object, the cable drainer (51 ₁ ) according to claim 1 or 2 is arranged at an equal distance from the cable inlet of the waterproof object and adjacent to each other. In addition, one piece is attached to each of the plurality of cables.
A method for draining a cable.

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