JP3967352B2 - Fiber optic cable accommodating flexible tube support device - Google Patents

Description

  The present invention relates to an optical fiber cable accommodating flexible tube support device used when laying a plurality of optical fiber cables on one sheath tube in an information box for accommodating road management optical fibers.

Today, the Ministry of Land, Infrastructure, Transport and Tourism is proceeding with the development of optical fibers for road management in order to improve road management in understanding road conditions by ITV and securing an information and communication network in the event of a disaster. As shown in FIG. 9, the road management optical fiber F uses a simple structure information box B installed in the basement of the road as a relay point or the like.
The optical fiber cable is accommodated in the sheath tube S, and the sheath tube S is connected to the information box B through various connecting tubes such as No. 2 connector type, bell mouth type, and PCL type.

Such information box B is also open to private operators, and the development of an advanced information and communications society in the 21st century is urgently required because the optical fiber network by the private company is inexpensive and is set up in a short time. It is expected to promote the construction of a nationwide optical fiber network (information highway) (see Non-Patent Document 1).
Nikkei Construction, Nikkei BP Publishing, July 24, 1998, pages 94-99.

  However, since the number of the sheath pipes S is limited, it is necessary to effectively use the sheath pipes S by laying and using multiple optical fiber cables in one sheath pipe S.

  At this time, it is necessary to support the newly installed optical fiber cable so as not to be displaced with respect to the information box B. The newly installed optical fiber cable is accommodated and installed in a protective flexible tube. Therefore, preventing the positional deviation of the newly installed optical fiber cable is also preventing the positional deviation of the flexible tube.

  However, although such support needs to be performed at or near the opening of the connecting pipe, a plurality of connecting pipe openings are provided close to the information box B, and an optical fiber cable is also present at that location. There is a problem that it is difficult to secure a space for installing the support and a large work space cannot be secured.

  In addition, since the external force applied to the optical fiber cable is large, the supporting force must be strengthened, and there is a problem that it is difficult to support it with a simple support tool in a situation where it is difficult to secure a work space.

  Therefore, the present invention provides an optical fiber cable accommodating flexible tube support device that can easily and firmly support a new optical fiber cable even when laying a new optical fiber cable together with an existing optical fiber cable. The purpose is to do.

In order to solve the above problems, the invention according to claim 1 is configured such that when a flexible tube into which a newly installed optical fiber cable is inserted into a connecting tube connected to an information box, the flexible tube is inserted into the information box. And a plurality of legs that are inserted into the connecting pipe and engage with the end portions of the connecting pipe, and the existing optical fiber cable and the A notch portion through which a flexible tube is inserted is formed, and when the locking portion is engaged with an end portion of the connecting tube, a flange portion that closes the opening of the connecting tube is attached to the notch portion, Cable protection that covers at least the edge of the notch and prevents the existing optical fiber cable from being damaged by contacting the edge when the existing optical fiber cable exists through the connecting pipe. A cover part; While gripping bite into the skin of the serial Friendly Tou tube, and a support portion movable Tou tube in its contact direction in contact with the flange portion is restricted from being misalignment, the support portion is rectangular It consists of a pair of support fittings formed by bending the central part of a piece into an arc shape, and a plurality of claws formed in the arc shape part, and the adjacent nails are formed in opposite directions. It is characterized by that.

  As a result, the engaging portion of the leg engages with the stepped portion of the connecting pipe, the flange portion is positioned and held in the opening of the connecting pipe, and the cable protection cover portion is inserted into the cutout portion so that at least the existing optical fiber is inserted. The cable prevents the cable from coming into direct contact with the flange, and the existing optical fiber cable and the flexible tube are separated to form a gap between them, and the support is inserted into the gap. Make it easy to do. And, since the support part bites into and sandwiches the flexible tube in such a state, the support part can be firmly sandwiched, and when the support part comes into contact with the contact piece, there is a displacement in the contact direction. Since it becomes possible to regulate, the new optical fiber cable can be supported easily and easily.

  Further, in the invention according to claim 2, the locking portion is formed by bending the distal end portion and the intermediate portion of the leg into a substantially U shape so that the bending direction is opposite to the end portion of the connecting pipe. According to the length, the fixing direction when the leg is fixed to the flange portion can be selected so that either one of the locking portions engages with the end portion.

  As a result, the flange portion can be held in a state of being directed to the opening, and the work of supporting the flexible pipe by the support portion in a state where the hand is released from the flange portion can be improved. To do.

  The invention according to claim 3 is characterized in that a covering material for covering the locking portion is provided.

  As a result, when the leg is inserted into the connecting pipe, it is possible to suppress damage to the connecting pipe due to the insertion of the leg, and the frictional resistance of the locking part increases, so that the state when the flange part is directed to the opening is maintained. Can be strengthened.

  According to a fourth aspect of the present invention, the cable protection cover portion comprises a pair of separators formed symmetrically, and when the separator is attached to the cutout portion, the flange portion surface A plate-like contact piece that is in contact with the rib, a rib that is formed on one side end of the corresponding piece, the height of which is set to the thickness of the edge of the notch, and the edge is connected to the rib. And a separating member having a crest that sandwiches the flange portion with the contact piece and separates the existing optical fiber cable and the flexible tube.

  As a result, a gap is formed between the flexible tube and the existing optical fiber cable, and when the flexible tube is sandwiched by the support portion, the support portion can be inserted into this gap. It will not get in the way and workability will be improved.

  Further, the invention according to claim 5 is provided with a recess at the edge of the notch, and a protrusion that allows the mounting position of the separator to be maintained when the rib is fitted to the recess and the separator is attached to the notch. A feature is provided.

  As a result, a gap is formed between the flexible tube and the existing optical fiber cable, and when the flexible tube is sandwiched by the support portion, the support portion can be inserted into this gap. It will not get in the way and workability will be improved.

The invention according to claims 1 to 5 comprises a pair of support fittings in which the support portion is formed by bending the central portion of the rectangular piece into an arc shape, and a plurality of claws are formed in the arc shape portion. And the direction of the adjacent nail | claw is formed in the mutually reverse direction.

  As a result, there is a claw that acts to always bite into the flexible pipe regardless of the direction of the external force applied to the flexible pipe regardless of the mounting direction of the support portion, etc., so that the flexible pipe is strong and reliable. Can be supported.

The invention according to claim 6 is provided with a through hole through which a bolt for fastening them is inserted at both ends of a pair of support fittings, and nuts that are screwed to the bolts at both ends of at least one support fitting. A rotation restricting piece for restricting the rotation of the motor is provided.

  Thereby, when bolting a support metal fitting, even if it does not regulate the idling of a nut with a spanner etc., it can tighten firmly and workability improves.

  According to the present invention, the flange portion is positioned and held in the opening of the connecting tube by engaging the locking portion of the leg with the end portion of the connecting tube, and the cable protection cover portion is inserted into the cutout portion, so that at least The existing optical fiber cable can be prevented from coming into direct contact with the edge of the flange and damaged, and the existing optical fiber cable and the flexible tube are separated to form a gap between them. The part can be easily inserted into the gap, and workability is improved.

  In addition, since the support portion bites into and sandwiches the flexible tube in such a state, the support portion can be firmly supported and the position shift in the contact direction can be regulated by the support portion coming into contact with the contact piece. As a result, the new optical fiber cable can be supported easily and easily.

  Embodiments of the present invention will be described with reference to the drawings. The sheath tube in which the optical fiber cable is accommodated is connected to the opening of the information box through various connecting tubes such as No. 2 connector type, bell mouth type, and PCL type. Hereinafter, the No. 2 connector type will be described as an example of the connecting pipe, but it is added in advance that the present invention is not limited to this.

  FIG. 1 shows an optical fiber cable 13 (13a, 13b) through a connecting pipe 12 of a No. 2 connector, which is a flexible pipe supporting apparatus 10 (hereinafter abbreviated as a flexible pipe supporting apparatus 10) according to the present invention. ) Is shown in an exploded perspective view, and FIG. 2 shows a state after laying work.

  The flexible tube support device 10 includes a flange portion 15 having a plurality of legs 14 as shown in FIG. 3, a pair of cable protection cover portions 16 attached to the flange portion 15 as shown in FIG. The main portion is a support portion 17 that supports a flexible tube 35 in which a new optical fiber cable 13a as shown in FIG.

  The flange portion 15 is made of a metal material having high corrosion resistance such as stainless steel, and is formed in a substantially disk shape having an outer diameter appropriately larger than the inner diameter of the connecting pipe 12, and the optical fiber cable 13 is inserted through a substantially central portion thereof. A notch 20 is provided. The notch 20 has an arch shape whose upper end forms an arc shape, and the left and right edge portions 22 are provided with a plurality of recesses 21. In the present embodiment, the case where two concave portions 21 are provided in the left and right edge portions 22 will be described as an example, but the present application is not limited to this number.

Further, a plurality of legs 14 are spot-welded on the back surface side (sheath tube 28 side) of the flange portion 15, and a general U shape is provided so that the projecting directions are opposite to the intermediate portion and the tip portion of the leg 14, respectively. A locking portion 23 that is bent in a letter shape is provided. Further, these locking portions 23 are covered with a covering material 24.
In addition, since the flange part 15 is formed with the metal, it can be used by cutting off suitably according to the condition of opening, etc.

  The covering material 24 is made of a synthetic resin tube or the like that shrinks by heat, and prevents the leg 14 from damaging the connecting pipe 12 when the leg 14 of the flange portion 15 is inserted into the connecting pipe 12. There is also for increasing the frictional force between the leg 14 and the connecting pipe 12.

  Of course, the purpose of providing the covering material 24 is to protect the connecting pipe 12 and improve the frictional force as described above, and therefore may be other methods and materials capable of realizing this function.

  FIG. 6 is a schematic cross-sectional view when the flange portion 15 is attached to the connecting pipe 12. The connecting pipe 12 is connected to the sheath pipe 28 by an adhesive 18 or the like, and the connecting pipe main body 29. The connecting pipe flange portion 30 is screwed into the inner wall of the portion 29.

  The connecting tube flange 30 is screwed into the connecting tube main body 29 with the bearing plate 31 directly attached to the information box interposed therebetween, so that the sheath tube 28 is connected to the information box.

  At this time, the end portion 32 of the connecting pipe flange portion 30 forms a stepped portion 33 with the inner wall of the connecting tube main body portion 29 in accordance with its thickness. Therefore, when the engaging portion 23 of the leg 14 in the flange portion 15 is fitted into the step portion 33, the flange portion 15 can be engaged with the connecting pipe 12. Therefore, the locking portion 23 is provided so as to be located at the stepped portion 33.

  Note that the distance to the stepped portion 33 differs depending on whether the connecting pipe 12 is a No. 2 connector, a bell mouth type, or the like, and the purpose of providing the plurality of locking portions 23 on the leg 14 can cope with such a situation. It is a thing.

  That is, when the leg 14 is spot-welded to the flange portion 15 and the distance to the stepped portion 33 is short as in the case of the No. 2 connector, as shown in FIG. Weld so that

  On the other hand, when the distance to the stepped portion 33 is long as in the bell mouth type, welding is performed so that the locking portion 23 at the tip end faces outward as shown in FIG. FIG. 8 is a cross-sectional view showing a state in which the sheath tube 28 is connected to the bearing plate 31 by the bell mouth type connecting tube 12 and the flange portion 15 is attached thereto.

  In this way, even if the same leg 14 is welded to the flange portion 15, the functioning locking portion 23 can be selected simply by changing the direction of welding to the flange portion 15. Therefore, the versatility of the leg 14 is improved, and component management is improved. It becomes easy and the cost can be reduced.

  As shown in FIG. 4, the cable protection cover portion 16 is composed of a pair of left and right separators 39 formed of synthetic resin. 4A is a perspective view of the pair of left and right separators 39, FIG. 4B is a perspective view of the separator 39 viewed from the opposite surface side, and FIG. 4C is viewed from the back side thereof. It is a perspective view.

  When these separators 39 face each other and are attached to the notch 20 of the flange portion 15, the new side pocket 36 in which the flexible pipe 35 in which the new optical fiber cable 13a is accommodated and the existing optical fiber cable 13b are arranged. An existing side pocket 37 is formed.

  As a result, the new optical fiber cable 13a and the existing optical fiber cable 13b are separated from each other so that a gap is formed between them, and at least the existing optical fiber cable 13b is directly contacted with the cutout portion 20 and protected from being damaged. is doing.

Such a separator 39 includes a plate-like contact piece 41, a rib 42 formed at one end of the contact piece 41, and a separator 43 provided to be connected to the rib 42. Yes.
The height h of the rib 42 is set to the thickness w of the flange portion 15 (which is also the thickness of the notch portion 20), and a convex portion 44 that fits into the concave portion 21 provided in the flange portion 15 is formed. .

The separating body 43 includes a crest 40 that extends in a direction perpendicular to the surface of the abutting piece 41 and protrudes from a surface opposed to the crest 40 when attached to the flange 15. An upper arc surface portion 45 is formed on the upper side, and a lower arc surface portion 46 is formed on the lower side.
Then, a new side pocket 36 is formed by the upper arc surface portion 45, and an existing side pocket 37 is formed by the lower arc surface portion 46.
The upper arc surface portion 45 and the lower arc surface portion 46 are provided with a plurality of cut grooves 47, which are intended to reduce the weight and weight of the member.

  The height h of the rib 42 is set to the thickness w of the flange portion 15, and reaches the edge 22 of the notch 20 while facing the surface side of the flange 15 (the surface on the side where the legs 14 are not provided). Insert and install. As a result, the rib 42 abuts on the edge portion 22, the convex portion 44 and the concave portion 21 are fitted, and the separator 39 is locked while being regulated in position.

  At least the rib 42 is provided so as to cover the edge portion 22, whereby the existing optical fiber cable 13 b comes into direct contact with the edge portion 22 and the existing optical fiber cable 13 b is damaged. Can be prevented.

  As shown in FIG. 5, the support portion 17 is composed of a pair of support fittings 51 in which a rectangular piece is formed in an arc shape at the center portion, and a claw portion 55 is formed at the center portion by bending. .

  A through hole 52 for screwing is formed at both ends of the support metal 51, and a long hole 53 is formed adjacent to the through hole 52. The elongated hole 53 of the one support metal 51 is formed with a rotation restricting piece 54 that is cut and raised to act as a rotation stopper for the nut.

  In FIG. 5, the claw portion 55 shows a case where four rows of four claws 56 are formed in the longitudinal direction and two rows in the width direction, and the directions of the adjacent claws 56 are set in different directions.

Thus, since the direction of the adjacent nail | claw 56 is a different direction, it supports reliably by the nail | claw 56 biting in regardless of the attachment condition of the support metal fitting 51, and irrespective of the direction of the force added to the flexible pipe 35. Is possible.
FIG. 5B and FIG. 5C are views showing how the claws 56 bite into the flexible tube 35 in the section AA and the section B-B in FIG.

  A construction procedure for laying the newly installed optical fiber cable 13a with such a configuration will be described with reference to FIG. In this case, the case where the existing optical fiber cable 13b is accommodated in one sheath tube 28 and the new optical fiber cable 13a is newly installed in the sheath tube 28 will be described as an example.

  First, the flexible tube 35 is inserted into the sheath tube 28 connecting the information boxes. As a result, the existing optical fiber cable 13b and the flexible tube 35 are drawn into the information box from the opening of the one connecting tube 12.

  Next, the flange portion 15 to which the cable protection cover portion 16 is attached is directed to the opening. At this time, since the new side pocket 36 and the existing side pocket 37 are formed by the cable protection cover portion 16, the flange portion 15 is addressed to the opening with the end of the flexible tube 35 inserted into the new side pocket 36. The leg 14 is inserted into the connecting pipe 12.

  When the leg 14 is inserted into the connecting pipe 12, the existing optical fiber cable 13 b is inserted into the existing side pocket 37 from the notch 20. When the leg 14 reaches the stepped portion 33 of the connecting pipe 12, the insertion of the flange portion 15 is completed.

Next, the loosely bolted support portion 17 is inserted into the flexible tube 35 and brought into contact with the flange portion 15. At this time, since the flange portion 15 is engaged with the connecting pipe 12 by the legs 14, the operator does not need to hold down the flange portion 15, and the flexible pipe 35 and the existing optical fiber cable 13b Therefore, the existing optical fiber cable 13b does not get in the way when the support portion 17 is easily brought into contact with the flange portion 15.
In addition, since the left and right flat portions 57 of the support fitting 51 are on the upper end 38 of the separator 39, the support fitting 51 itself does not rotate.
As a result, even when only a narrow work space can be secured, the support portion 17 can be easily attached and workability is improved.

  Finally, the bolt is tightened so that the claw 56 is bitten into the flexible tube 35. As a result, the flexible tube 35 is firmly held by the support portion 17, and the support portion 17 abuts against the flange portion 15, so that the flexible tube 35 is displaced due to an external force in the abutment direction. Things will disappear. Therefore, it is possible to prevent the positional deviation of the newly installed optical fiber cable 13a.

It is a disassembled perspective view which shows the mode at the time of laying a new optical fiber cable which supports a flexible pipe | tube with the flexible pipe | tube support apparatus concerning this invention. It is a perspective view which shows a mode that the newly installed optical fiber cable was laid. It is a perspective view of a flange part. It is a figure which shows the structure of a cable protection cover part. It is a figure which shows the structure of a support part. It is sectional drawing at the time of mounting | wearing with a flange part when a connection pipe is No. 2 connector. It is a perspective view of the flange part of the structure replaced with FIG. It is sectional drawing at the time of mounting | wearing with a flange part when a connection pipe is a bell mouth type. It is a figure explaining the embedding state of an information box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flexible pipe support apparatus 12 Connection pipe 13 Optical fiber cable 13a New optical fiber cable 13b Existing optical fiber cable 14 Leg 15 Flange part 16 Cable protection cover part 17 Support part 18 Adhesive material 20 Notch part 21 Concave part 22 Edge part 23 Engagement Stop part 24 Covering material 28 Sheath pipe 29 Connecting pipe main body part 30 Connecting pipe flange part 31 Bearing plate 32 End part of connecting pipe flange part 33 Stepped part 35 Flexible pipe 36 New side pocket 37 Existing side pocket 39 Separator 40 Mountain part 41 Contact piece 42 Rib 43 Separator 44 Protruding part 45 Upper arc surface part 46 Lower arc surface part 47 Cut groove 51 Support metal fitting 52 Through hole 53 Long hole 54 Rotation restricting piece 55 Claw part 56 Claw 57 Flat part

Claims (6)

An optical fiber cable accommodating flexible pipe support device for supporting a flexible pipe inserted into a connecting pipe connected to an information box when the newly installed optical fiber cable is inserted into the information box. ,
A plurality of legs inserted into the connecting pipe and engaged with an end of the connecting pipe are fixed, and an existing optical fiber cable and a notch through which the flexible pipe is inserted are formed, and the locking A flange portion that closes the opening of the connecting pipe when the portion engages with an end of the connecting pipe;
When the existing optical fiber cable is attached to the notch, covers at least the edge of the notch, and is inserted through the connecting pipe, the existing optical fiber cable contacts the edge and is damaged. Cable protection cover to prevent
Having a support portion that bites into and sandwiches the skin of the flexible tube and abuts against the flange portion and regulates the displacement of the flexible tube in the contact direction;
The support portion is formed of a pair of support fittings formed by bending a central portion of a rectangular piece into an arc shape, and a plurality of claws formed on the arc shape portion. An optical fiber cable-accommodating flexible tube support device characterized by being formed in the reverse direction .   The locking portion is formed by bending the distal end portion and the intermediate portion of the leg into a generally U shape so that the bending direction is opposite, and depending on the length to the end portion of the connecting pipe, The optical fiber cable can be accommodated according to claim 1, wherein a fixing direction when the leg is fixed to the flange portion can be selected so that one of the locking portions engages with the end portion. Tube support device.   The optical fiber cable accommodating flexible tube support device according to claim 1 or 2, further comprising a covering material that covers the locking portion. The cable protection cover part is composed of a pair of symmetrically formed separators, and the separator contacts the flange part surface when the cable protection cover part is attached to the notch part. With a piece,
A rib that is formed at one end of the abutting piece and whose height is set to the thickness of the edge at the notch and covers the edge;
And a separation body provided with a crest that is connected to the rib and sandwiches the flange portion with the contact piece and separates the existing optical fiber cable from the flexible tube. The optical fiber cable accommodating flexible tube support device according to any one of claims 1 to 3.   A recess is provided at the edge of the notch, and a protrusion is provided to hold the separator mounting position when the rib is fitted to the recess and the separator is attached to the notch. The optical fiber cable accommodating flexible tube support device according to claim 4. Both ends of the pair of support fittings are provided with through-holes through which bolts for fastening them are inserted, and at the same time, at least one of the support fittings is restricted from being idled by nuts screwed with the bolts. The optical fiber cable accommodating flexible tube support device according to any one of claims 1 to 3, wherein a rotation restricting piece is provided .

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