JP2001165811A - Hand-hole lid opening/closing detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a lid opening/closing detection device is separate from a closure for connecting an optical cable in a hand hole, and optical fibers are bonded at two points in execution, the connection losses are increased, and a space for wiring the optical fiber is required in the hand hole. SOLUTION: A part in contact with a work to be detected is separately provided from a detection device body portion having a means to bend the optical fiber, both portions are connected to each other via a release cable, and the body portion is integrated with the closure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing detecting device used for monitoring a cover of a handhole or other auxiliary equipment in an optical fiber line.

[0002]

2. Description of the Related Art Conventionally, OTDR has been used to monitor the opening and closing of a handhole cover in an optical fiber line, and several lid opening / closing detecting devices using an optical fiber bending loss used in this OTDR have been proposed. ing.

The present inventors have also invented and applied for a lid opening / closing detecting apparatus using the optical fiber bending loss shown in FIGS. 3 and 4 (Japanese Patent Application Nos. 11-341109 and 11-3).
41112). When the lid of the handhole is closed, the lid opening / closing detection device moves the movable member 11 downward while compressing the spring 13, and this movement is transmitted to the movable member 21 by the release cable 15,
By moving the optical fiber 1 downward, the optical fiber 1 is released from bending loss (the state of FIG. 3). When the lid is open, the movable member 11 is moved upward by being urged by the compressed spring 13, which is transmitted to the movable member 21 by the release cable 15, and moves the movable member 21 upward. This causes the optical fiber 1 to bend,
The transmission loss or reflection loss of the optical fiber is detected to detect the opening of the handhole cover. Further, the lid opening / closing detecting device in FIG. 4 shows a device having means for giving three sets of bending.

[0004]

Conventionally, as shown in FIG. 6, the lid opening / closing detecting device as described above and the closure for connecting an optical cable have different structures. That is, in FIG. 6, the main body 20 of the opening / closing detection device is provided at a position separated from the contact portion 10 of the opening / closing detection device that is in contact with the handhole cover, and the contact portion 10 and the main body 20 are connected by the release cable 15. The optical fiber 1 for sensor (providing bending) is connected to the closure 30.

[0005] As a result, the number of fusion spliced portions of the optical fiber wiring is two at the time of construction, and connection loss increases. Also, a space for optical fiber wiring is required in the handhole. Further, the cost for the optical fiber wiring is increased, and the number of failure factors increases accordingly.

The present invention has solved the above-mentioned problems.

[0007]

SUMMARY OF THE INVENTION An opening / closing detection device for a handhole cover or the like according to the present invention comprises a contact portion with a detection target having a first movable member that moves in accordance with opening / closing of a handhole cover or the like. A main body provided at a position distant from the contact portion and having a second movable member that moves in accordance with the movement of the first movable member, and having means for bending the optical fiber by the movement of the second movable member An opening / closing detection device comprising: a first portion and a transmission means for transmitting the movement of the movable member between the first and second movable members, wherein a main body of the opening / closing detection device is adjacent to an optical fiber cable connection closure. And is integrated with the closure.

Further, the transmission means for transmitting the movement of the movable member is a release cable, and the main body of the opening / closing detection device accommodates means for bending the plurality of optical fibers.

Further, one core wire of the optical fiber cable inserted into the closure is an optical fiber to which a bend is provided in the open / close detection device.

[0010] The above-mentioned structure solves all the problems described above. That is, since the sensor optical fiber that receives bending loss uses one core wire of the optical cable, only one fusion splicing is required. Further, in addition to the lid open / close detection, lock open / close (unlocked) detection and water level detection can be performed by an open / close detection device integrated with the closure, further reducing the cost.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an opening / closing detection device for a handhole cover or the like according to the present invention. In FIG. 1, a contact portion 10 of an opening / closing detection device installed near a detection target such as a handhole cover moves according to opening and closing of the detection target as described later (shown in FIGS. 3 and 4). A first movable member is provided. The main body 20 of the opening / closing detection device provided integrally with the closure 30 adjacent to the connection closure 30 of the optical fiber cable 100 installed in the handhole remote from the contact portion 10 as described later, A second member that moves in accordance with the movement of the first movable member;
And a means for bending the optical fiber by the movement of the second movable member.

The first movable member of the contact portion 10 and the second movable member of the main body 20 are connected by a release cable 15.

Further, one fiber core wire 1 is taken out from the extra length storage shelf 31 of the optical fiber cable 100 in the closure 30 and is connected to one of the fusion splicing points 101 via a means for giving a bend in the main body 20. Connected in several places.

Further, the main body 20 is provided with means for bending the plurality of optical fibers. FIG. 2 shows the contact portion 10 and the main body 2 of the opening / closing detection device of the present invention, which are provided with means for bending the plurality of optical fibers.
0 shows an example of installation in a handhole. In FIG. 2, there are three contact portions 10 of the opening / closing detection device, the first is for detecting opening / closing of the handhole cover 40, and the second is for locking 4.
The third is a water level monitoring sensor 42.

Next, the contact portion 10 of the open / close detection device of the present invention will be described.
The configuration of the main body 20 will be described. FIG. 3 is an explanatory view of an opening / closing detection device having a unit for giving a single bending. First, the contact portion 10 includes a movable member 11 that moves up and down in response to opening and closing of a handhole cover and the like. This movable member 11 has a roller 12 at its tip which comes into contact with a lid or the like,
A spring 13 is inserted, and a rear end is connected to a release cable 15. The connection between the spring 13 and the release cable 15 is in the filled grease 14. The movable member 11 is a contact part case 1 having a through hole 16.
7 movably supported. Reference numeral 18
Is a fixing bolt hole.

The main body 20 of the opening / closing detection device includes a movable member 2
The movable member 21 is movably supported by a through hole 22, and the up and down movement of the movable member 11 is transmitted as it is by a release cable 15 and moves up and down. In the main body portion 20, the optical fiber 1 giving bending loss is housed in a coil spring or a hard rubber tube 2, and the coil spring or the hard rubber tube 2 housing the optical fiber 1 is orthogonal to the moving direction of the movable member 21. The roller 3 is mounted on the lower end side of the movable member 21, and the roller 4 is provided inside the coil spring or the hard rubber tube 2 where the U-turn is made. ing. Optical fiber 1
Is guided to the outside through the through hole 6 of the box 7 and is provided with a waterproof protector 9. The box 7 is provided with a packing 8 to have a waterproof structure, and the through holes 6 and the like are waterproofed.

Next, the operation of the opening / closing detection device will be described with respect to the opening / closing of the cover of the handhole. When the cover of the handhole is closed, the device is in the state of FIG. Move down while compressing,
The moving amount is controlled by the release cable 15 for the movable member 2.
1, the optical fiber 1 is released from bending loss by moving the movable member 21 downward. Also,
When the lid is open, the movable member 11 moves upward by being urged by the compressed spring 13, which is transmitted to the movable member 21 by the release cable 15, and
By moving the optical fiber 1 upward, the curvature of the roller 3 is given to the optical fiber 1, causing a loss in the optical fiber 1.

Next, a structural example of the release cable 15 will be described. As shown in a longitudinal sectional view of FIG. 5, a wire 150 is covered with a fluororesin tube 151.
A coil spring 152 accommodating the coil spring 152 and a SUS mesh tube 15 provided on the periphery of the coil spring 152
3 and a heat-shrinkable tube 154 placed thereon.

FIG. 4 is an explanatory view of an open / close detecting device having a plurality of bending means. The contact portion 10 has exactly the same structure as that of FIG. I do. The main body 20 of the opening / closing detection device includes the movable member 2.
One set is provided and each is movably supported by a support having a through hole 25. The optical fiber 1 which gives bending loss is a coil spring or a hard rubber tube 2
The coil spring or the hard rubber tube 22 containing the optical fiber 1 is disposed in a direction perpendicular to the moving direction of the movable member 21 and is U-turned at the center, and both ends are fixed by the fixture 26. I have. A first roller 23 is mounted on the lower end side of the movable member 21, and a second roller 24 is arranged on both sides of the first roller 23 so as to sandwich a coil spring or a hard rubber tube 22 into which the optical fiber 1 is inserted. Thus, a means for bending the optical fiber 1 is provided.
Three sets of means for providing bending configured in this manner are installed adjacent to each other.

[0020]

According to the opening / closing detection device for a handhole cover or the like of the present invention, a sensor optical fiber for giving a bending loss is fused by using one core wire of an optical fiber cable inserted in a closure. Only one connection point is required. Accordingly, connection loss is reduced as compared with the conventional fusion splicing portion having two portions.

Further, the space for the optical fiber wiring is not required in the handhole, and the cost for the optical fiber wiring can be reduced. Further, in addition to the lid opening / closing detection, unlocking detection and water immersion detection can be performed by the opening / closing detection device integrated with the closure, so that the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an opening / closing detection device such as a handhole cover according to the present invention.

FIG. 2 is an explanatory diagram showing an example of installation in a hand hole for explaining another embodiment of the opening / closing detection device for a hand hole cover or the like of the present invention.

FIG. 3 is an explanatory diagram showing a configuration example of an opening / closing detection device for a handhole cover or the like according to the present invention.

FIG. 4 is an explanatory diagram showing another configuration example of the opening / closing detection device for a handhole cover or the like according to the present invention.

FIG. 5 is a longitudinal sectional view showing a structural example of a release cable according to the present invention.

FIG. 6 is an explanatory view showing an example of installation of a conventional lid opening / closing detection device in a handhole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical fiber 10 Contact part of opening / closing detection device such as lid 11, 21 Movable member 13 Spring 15 Release cable 20 Main body of opening / closing detection device of lid etc. 30 Closure 31 Extra length storage shelf 100 Optical fiber cable 101 Fusion connection point

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuo Amano 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Co., Ltd. F-term (reference) 2G086 DD05

Claims (4)

[Claims] A contact portion provided with a first movable member that moves in accordance with opening and closing of a handhole cover and the like, and a contact portion provided at a position distant from the contact portion; A main body of an opening / closing detection device including a second movable member that moves in accordance with the movement, and a unit that bends the optical fiber by the movement of the second movable member;
And a transmitting means for transmitting the movement of the movable member between the movable members of the opening / closing detection device, wherein a main body of the opening / closing detection device is provided adjacent to the optical fiber cable connection closure and integrated with the closure. An opening / closing detection device for a handhole cover or the like. 2. The opening / closing detection device for a handhole cover or the like according to claim 1, wherein the transmission means for transmitting the movement of the movable member is a release cable. 3. The opening / closing detection device for a handhole cover or the like according to claim 1, wherein means for bending the plurality of optical fibers is accommodated in a main body of the opening / closing detection device. 4. The handhole according to claim 1, wherein one core wire of the optical fiber cable inserted into the closure is an optical fiber to which a bend in the main body of the opening / closing detection device is given. Open / close detection device for lids, etc.