JP7288761B2 - Optical cable laying structure for existing pipes - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure for laying an optical cable to an existing pipe such as a handrail installed on a bank body of a dam or the like.

(First prior art)
Conventionally, various devices such as a water level sensor of a dam are connected to a data processing device of a dam management office by an optical cable, and data for dam management such as measurement data are transmitted to the data processing device. For example, as shown in FIG. 8, an optical cable 7 that connects various devices 6 such as a water level sensor and the dam management office 2 is housed in a plastic pipe 41 (vinyl chloride pipe or the like) and is connected to the embankment body of the dam 4. 5, the plastic pipe 41 expands or contracts greatly due to changes in the outside air temperature, and when a large load is repeatedly applied to the mounting bracket 43, the mounting bracket 43 may be damaged. 5 or the plastic pipe 41 is removed from the mounting bracket 43 due to corrosion of the mounting bracket 43 or the like, and the plastic pipe 41 and the optical cable 7 housed in the plastic pipe 41 fall off the bank body 5 of the dam 4. Inconvenience of hanging down from the side wall surface 42 may occur.

(Second prior art)
Another method of laying an optical cable is to pass the optical cable between the manholes on the upstream side and the manhole on the downstream side of the sewage pipe, run a truck inside the sewage pipe, and use a fixed tool to pay out the optical cable from the truck. A technique of fixing to the upper part of the sewage pipe at intervals is known (see Patent Document 1).

JP 2002-171626 A

In the case of the first prior art, a worker climbs out from the embankment body 5 of the dam 4 to the dam lake surface side using a special vehicle or hanging ladder to replace or repair the mounting bracket 43 . In addition, when the optical cable 7 is to be re-stretched, the worker has to go from the embankment body 5 of the dam 4 to the dam lake surface side using a special vehicle or a suspension ladder to perform the work of re-stretching the optical cable 7. - 特許庁Therefore, in the laying method of the optical cable 1 of the first prior art, repair and maintenance of the place where the optical cable is laid and replacement work of the optical cable 7 cost a lot of money, and the safety of the work is a problem.

In addition, the optical cable laying method according to the second prior art is premised on laying the optical cable in a large-diameter sewage pipe, and the existing pipes such as the handrail of the embankment of the dam and the pipe-shaped frame of the fence of the dam. It is not intended for laying optical cables in

Therefore, the present invention can reduce the cost required for the repair and maintenance of the optical cable installation location and the optical cable replacement work at the dam, and can improve the safety of the repair and maintenance of the optical cable installation location and the optical cable replacement work at the dam. To provide a structure for laying an optical cable to an existing pipe that can be installed.

The present invention relates to a structure for laying an optical cable on an existing pipe 1. FIG. In the present invention, an optical cable 7 is inserted into the existing pipe 1 at the end of the existing pipe 1 installed on the bank body 5 of the dam 4 with a radius of curvature greater than or equal to the allowable radius of curvature, or Alternatively, a pull box 10 is attached that enables the optical cable 7 to be pulled out from the existing pipe 1 with a radius of curvature larger than the allowable radius of curvature.
Specifically, a pull box is provided at the end of an existing pipe consisting of a handrail installed on the bank of the dam or a pipe-shaped frame of the dam fence ,
The pull box is formed in the shape of a rectangular parallelepiped, and has at least an optical cable passage hole provided on the bottom surface for allowing the optical cable to pass through, and an existing pipe engaging hole provided on the side surface for engaging the end of the existing pipe. and
The optical cable is passed through the optical cable passage hole, laid in the existing pipe, and curved with a radius of curvature greater than or equal to the radius of curvature allowed in the pull-bok.
That is, the optical cable inserted into the pull box through the optical cable passage hole is bent with a radius of curvature greater than or equal to the allowable radius of curvature, inserted into the existing pipe, and laid inside the existing pipe, or , the optical cable laid in the existing pipe and inserted into the pull box is bent with a radius of curvature larger than the allowable radius of curvature and taken out from the optical cable passage hole.

The optical cable laying structure for existing pipes according to the present invention is provided by laying optical cables in existing pipes such as handrails installed on the embankment of a dam and pipe-shaped frames of dam fences. It is possible to reduce the cost required for the repair and maintenance of the optical cable and the replacement work of the optical cable, and improve the safety of the repair and maintenance of the optical cable laying location in the dam and the replacement work of the optical cable.

It is a figure which shows the optical cable laying structure to the existing pipe based on the Example of this invention. FIG. 2 is a diagram of a part of the structure for laying an optical cable to an existing pipe shown in FIG. 1 as viewed obliquely from above; 3(a) is a front view of the pull box, FIG. 3(b) is a plan view of the pull box, FIG. 3(c) is a right side view of the pull box, FIG. 3d) is a left side view of the pull box, FIG. 3(e) is a rear view of the pull box, and FIG. 3(f) is a rear view of the pull box. 4(a) is a front view of the pull box body, FIG. 4(b) is a plan view of the pull box body, and FIG. 4(c). ) is a right side view of the pull box body, FIG. 4(d) is a left side view of the pull box body, FIG. 4(e) is a rear view of the pull box body, and FIG. 4(f) is a back view of the pull box body. be. Fig. 5(a) is a front view showing the use state of the fixing metal fitting, and Fig. 5(b) is the use state of the fixing metal fitting. , and FIG. 5(c) is a plan view showing the state of use of the fixture. FIG. 10 is a diagram showing a structure for laying an optical cable to an existing pipe according to Modification 1 of the present invention; FIG. 10 is a diagram showing a structure for laying an optical cable in an existing pipe according to Modification 2 of the present invention; 1 is a diagram showing a conventional optical cable laying structure; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a structure for laying an optical cable to an existing pipe 1 according to an embodiment of the present invention. FIG. 2 is a view of part of the structure for laying the optical cable to the existing pipe 1 shown in FIG. 1 as seen obliquely from above.

As shown in these figures, the data processing device 3 of the dam management office 2 is installed on the upper part of the embankment body 5 of the dam 4, and is connected to various devices 6 such as a water level sensor of the dam 4 by an optical cable 7. It receives dam management data transmitted from various devices 6 such as sensors.

The optical cable 7 passes through a protective tube 8 extending from the device 6, a pull box 10 to which the protective tube 8 is attached, and an existing round pipe-shaped pipe (handrail) 1 to which the pull box 10 is attached. It is connected to the data processing device 3 .

The existing pipe 1 is made of metal (for example, iron), and is fixed to a plurality of supports 12 installed at approximately equal intervals along the upper passage 11 of the bank body 5 of the dam 4. A space 13 penetrates. A pull box 10 is attached to one end of the existing pipe 1 .

The pull box 10 is formed in the shape of a rectangular parallelepiped, and an existing pipe engagement hole 14 for inserting the existing pipe 1 is formed on one side surface 10a, and an optical cable passage hole 14 for allowing the passage of the optical cable 7 is formed on the bottom surface 10f. A hole 15 is formed (see FIGS. 3 and 4). An optical cable passage hole 15 of the pull box 10 is adapted to allow insertion of the end of a protective tube 8 (a plastic tube such as vinyl chloride) extending from the device 6 . In this pull box 10, the size of the internal space 16 and the positions of the optical cable passing hole 15 and the existing pipe engaging hole 14 allow the optical cable 7 to pass through with a radius of curvature greater than or equal to the allowable radius of curvature. (the optical cable 7 taken out from the protective tube 8 can be inserted into the internal space 13 of the existing tube 1).

FIG. 3 is a diagram showing details of the pull box 10. As shown in FIG. FIG. 4 is a diagram showing the details of the pull box main body 18 with the lid 17, which is the upper surface 10e of the pull box 10, removed. As shown in these figures, the pull box 10 has a pull box body 18 that opens upward, and an upper open end 20 of the pull box body 18 is opened and closed with a lid 17 . The pull box main body 18 has lid mounting portions 21 for engaging the side walls 17a of the lid 17 formed on the upper end sides of four side surfaces 18a to 18d, and screw holes 23 for fixing the side walls 17a of the lid 17 with screws 22. They are formed on the four side surfaces 18a to 18d of the mounting portion 21. As shown in FIG. The lid 17 is detachably fixed to the lid attachment portion 21 of the pull box 10 with screws 22 via a packing (sealing material) 24 . An existing pipe engaging hole 14 is formed in the right side surface 10a of the pull box body 18. As shown in FIG. An optical cable passage hole 15 is formed in the bottom surface 10f of the pull box main body 18. As shown in FIG. In this way, the pull box 10 can easily fix the existing pipe 1 and the protective pipe 8 by removing the lid 17 from the pull box main body 18 and opening the upper open end 20 of the pull box main body 18. becomes possible to do. At least one drainage hole 25 is formed in the bottom surface 10f of the pull box main body 18 as required. Also, the lid 17 has a packing 24 sandwiched between the ends of the four side walls 17a and the lower surface of the lid mounting portion 21 of the pull box body 18 to prevent water from entering the pull box body 18. However, water may be prevented from entering the pull box main body 18 by inserting a packing between it and the upper end of the pull box main body 18 . Also, the pull box 10 can be opened and closed by using the top surface 10e side as the lid 17, but it is not limited to this, and one side surface (10a to 10d) may be used as a lid so that it can be opened and closed. The sides and sides (10a to 10d) may be lids that can be opened and closed.

FIG. 5 is a diagram showing the state of use of the fixture 26 that fixes the existing pipe 1 (or protective pipe 8) and the pull box 10. As shown in FIG. As shown in FIG. 5, the fixing bracket 26 includes a substantially L-shaped fixing portion 30 fixed to the inner wall surface 27 of the pull box 10 with a screw 28, and an existing fixing portion 30 integrally formed at the tip of the fixing portion 30. It has a holding portion 31 that is curved along the shape of the tube 1 (or the protective tube 8) and a tightening portion 32 that is integrally formed so as to rise from the holding portion 31. A pair of such fixtures 26 are used facing each other to fix the end of the existing pipe 1 (or protective pipe 8 ) to the inner wall surface 27 of the pull box 10 . Further, by operating a bolt 33 attached to the tightening portion 32 of the pair of fixing metal fittings 26, 26, the gap between the pair of tightening portions 32, 32 facing each other is changed, and the existing pipe 1 (or protective pipe 8) is fixed. The tightening force of can be adjusted. By using the fixture 26 in this manner, the pull box 10 is detachably fixed to one end of the existing pipe 1 and one end of the protective pipe 8 . The work of fixing the existing pipe 1 (or the protective pipe 8) and the pull box 10 with the fixing bracket 26 can be performed from above the pull box body 18 by removing the lid 17 of the pull box 10. .

Although the existing pipe 1 is exemplified as a handrail of the embankment body 5 of the dam 4, it is not limited to this, and a pipe-shaped frame of a fence having a space through which the optical cable 7 can pass also corresponds.

According to the structure for laying an optical cable to the existing pipe 1 according to the present embodiment as described above, a handrail installed on the embankment body 5 of the dam 4, a pipe-shaped frame of the fence of the dam 4, and the like are installed in the existing pipe 1. By laying the optical cable 7, an operator can use a special vehicle or a hanging ladder to get out from the embankment body 5 of the dam 4 to the lake surface side of the dam to repair or maintain the location where the optical cable 7 is laid and to replace the optical cable 7. Therefore, it is possible to reduce the cost required for repair and maintenance of the installation location of the optical cable 7 in the dam 4 and replacement work of the optical cable 7, and the repair and maintenance of the installation location of the optical cable 7 in the dam 4 and replacement work of the optical cable 7 can be reduced. Safety can be improved.

(Modification 1)
FIG. 6 is a diagram showing a structure for laying an optical cable to an existing pipe 1 according to Modification 1 of the present invention. As shown in FIG. 6, the pull box 10 according to Modification 1 has a first existing pipe engaging hole 14 that engages with the end of the first existing pipe 1A. A second existing pipe engaging hole 14 engaged with the end of the second existing pipe 1B positioned linearly with respect to the pipe 1A is formed in the right side surface 10a and engaged with the end of the protective pipe 8. An optical cable passage hole 15 is formed in the bottom surface 10f. Such a pull box 10 can pass the optical cable 7 extending from the protective tube 8 to the second existing pipe 1B with a radius of curvature greater than or equal to the allowable radius of curvature. The extending optical cable 7 can be passed in a straight line (with a radius of curvature greater than or equal to the allowable radius of curvature).

(Modification 2)
FIG. 7 is a diagram showing a structure for laying an optical cable to the existing pipe 1 according to Modification 2 of the present invention. As shown in FIG. 7, the pull box 10 in Modification 2 has a first existing pipe engaging hole 14 that engages with the end of the first existing pipe 1A and a stepped portion with respect to the first existing pipe 1A. are formed in the opposing side surfaces 10a and 10c. The optical cable laying structure for the existing pipe 1 according to Modification 2 is such that the radius of curvature of the optical cable 7 passing through the inside of the pull box 10 is greater than or equal to the allowable radius of curvature. 2 Adjust the distance from the end of the existing pipe 1B (cut the first existing pipe 1A or the second existing pipe 1B if necessary), and determine the size of the pull box 10.

(other variations)
As shown in FIG. 1, the pull box 10 is not limited to being installed on the side where the optical cable 7 is inserted into the existing pipe 1, but is also installed on the side where the optical cable 7 is extracted from the existing pipe 1. The optical cable 7 taken out from the tube 1 may be pulled into the dam management station 2 with a radius of curvature equal to or larger than the allowable radius of curvature.

In addition, the pull box 10 is not fixed to the existing pipe 1 using the fixing metal fittings 26 of FIG. may be fixed directly to the embankment body portion 5 of the .

In addition, the pull box 10 is not limited to the above embodiments and modifications, and may be configured such that a plurality of protective tubes 8 are connected to the bottom surface 10f and a protective tube is connected to at least one side surface (10a to 10d). good.

In the pull box 10, the gap between the existing pipe engagement hole 14 and the existing pipe 1 and the gap between the optical cable passage hole 15 and the protective pipe 8 are filled with a caulking material (filler such as silicone resin or polyurethane resin). Alternatively, airtightness and waterproofness may be enhanced.

1... existing pipe, 4... dam, 5... embankment body, 7... optical cable, 10... pull box

Claims (4)

A pull box is provided at the end of the existing pipe consisting of a handrail installed on the dam body or a pipe-shaped frame of the dam fence ,
The pull box is formed in the shape of a rectangular parallelepiped, and has at least an optical cable passage hole provided on the bottom surface for allowing the optical cable to pass through, and an existing pipe engaging hole provided on the side surface for engaging the end of the existing pipe. and
The optical cable is passed through the optical cable passage hole, laid in the existing pipe, and curved with a radius of curvature greater than or equal to the radius of curvature allowed in the pull-bok.
An optical cable laying structure to an existing pipe, characterized by: 2. A structure for laying an optical cable to an existing pipe according to claim 1, wherein said existing pipe is fixed inside said pull box by means of fixing metal fittings fixed to the inner wall surface of said pull box. At least one side of the pull box can be opened and closed,
3. The structure for laying an optical cable to an existing pipe according to claim 1 or 2, characterized in that: The pull box has a drain hole formed in the bottom surface ,
3. The structure for laying an optical cable to an existing pipe according to claim 1 or 2, characterized in that:

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