JP4471489B2 - Messenger wire tension device and tension method for in-pipe cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a messenger wire tensioning device used when laying a communication cable such as an optical fiber cable in an underground pipeline.
[0002]
[Prior art]
As a new communication method, creation of an information communication network using an optical fiber cable as a transmission medium has been studied in various places. In this situation, instead of changing the existing telephone line to an optical fiber cable, a method of laying an optical fiber cable in a sewage pipe having a communication path to each household is beginning to be realized.
However, the optical fiber cable is lighter than the metal cable, flexible, easy to handle, and excellent in transmission speed and transmission capacity, but has a small breaking elongation, so it is laid in the sewer main (sewage pipe). Sometimes it is necessary to proceed so that tension is not applied. In addition, when an optical fiber cable is laid in a pipe line adopting the natural flow method, it is required to lay it on the upper part of the pipe inner wall so as not to disturb the flow of sewage in the pipe.
[0003]
As a method of laying an optical fiber cable without applying tension to the upper side in the sewer main, techniques described in Japanese Patent Publication No. 3-50483 and Japanese Patent Laid-Open No. 8-103012 are known. In these conventional techniques, while inserting an optical fiber cable, the optical fiber cable is lifted by the arm of the laying robot and pressed to the upper side in the sewer main, and the hook is attached to the inner surface of the sewer main at an appropriate interval, and the cable is attached to the hook. It will be hung.
[0004]
[Problems to be solved by the invention]
However, the laying robot has a complicated structure including an arm mechanism for pressing a cable, a drill mechanism that pierces a hook mounting hole, an adhesive injection mechanism, a hook pressing mechanism, and the like. It took time and was expensive. Furthermore, when tensioning a cable passed through the sewage main, it is difficult to install a strong tensioning device in the manhole, so there is a risk that the cable will not be tight enough to hang down in the main.
In the present invention, an optical fiber cable is laid in an underground pipeline without using a laying robot, and tension is applied to the fiber cable by tensioning a messenger wire (auxiliary cable) that slidably holds the optical fiber cable. It is an object of the present invention to provide a tension device for an in-pipe insertion messenger wire that can be smoothly laid without causing the effect to act.
[0005]
[Means for Solving the Problems]
To achieve the above object, the present invention, when laying an optical fiber cable to the upper portion of the inner wall of the underground this tube connecting between manholes, tensions the messenger wire to bear tension hooked the optical fiber cable slidably It is what you do.
That is, claim 1 is an apparatus that tensions a messenger wire that bears tension by slidably latching the optical fiber cable when laying the optical fiber cable on the inner wall upper part of the underground main pipe that connects the manholes. And at least one locking means provided on the manhole straight wall portion above the upper edge of the abutment opening between the manhole and the underground main pipe to lock one end of the messenger wire, and the messenger wire In order to wind up the other end of the manhole, the manhole provided with a space between the manhole and the underground main pipe is provided on the manhole straight wall portion spaced apart from the manhole above the upper edge of the abutting opening. and at least one latching hoist mechanism, provided by fixing the abutment opening upper edge of the manhole and underground mains Abutting opening between the manhole and the underground main pipe for guiding the messenger wire inserted into the main pipe along the outer periphery of the guide member toward the latch-type winding mechanism or the locking means. It consists of a round bar or a tubular guide member fixed to the upper edge so as to be orthogonal to the main shaft direction, and the locking means is a bracket fixed to the manhole straight wall, inserted through the bracket, and messenger An eyebolt having a ring or hook at the lower end of the wire end, a coil spring that is contracted around the eyebolt and has one end placed on the bracket, and screwed into the upper end of the eyebolt, and the other end of the coil spring from above The latch-type winding mechanism is composed of a spring receiver that presses down. At the end, a claw wheel is provided to engage with the claw on the winding drum support bracket side, and an engagement hole or an engagement projection adapted to the shaft rotation tool is formed at the end of the shaft. It is a messenger wire tension device.
Claim 2 is an apparatus for tensioning a messenger wire that bears tension by slidably latching the optical fiber cable when laying the optical fiber cable on the inner wall upper part of an underground main pipe connecting between manholes, At least one locking means provided on the manhole straight wall above the upper edge of the abutment opening between the manhole and the underground main pipe to lock one end of the messenger wire; In order to wind up the end, at least provided at the manhole straight wall portion spaced apart from the manhole above the abutting opening upper edge between the manhole and the underground main pipe spaced apart from the manhole. One latch-type hoisting mechanism and the upper edge of the abutment opening between the manhole and the underground main pipe so as to be orthogonal to the main axis direction A round bar or a tubular guide member provided so as to guide the messenger wire inserted into the main pipe along the outer periphery of the guide member toward the latch-type winding mechanism or the locking means Or a guide member in the form of a tube, and the locking means includes a bracket fixed to a manhole straight wall, an eyebolt inserted through the bracket and having a latching ring or hook at the end of a messenger wire, and the eyebolt. A coil spring having one end mounted on the bracket and a spring receiver screwed into the upper end of the eyebolt and pressing the other end of the coil spring from above. together for supporting the rotation shaft and the vertical pawl wheel winding drum, provided the eyebolt near the winding drum, the manhole straight wall A messenger wire tensioning apparatus that winds up by changing the direction in the horizontal direction messenger wire end through pulling the ring portion of the eyebolt I.
A third aspect of the present invention is a method of laying an optical fiber cable using the messenger wire tensioning device according to any one of the first and second aspects, wherein the optical fiber cable and the messenger wire are inserted into a pipe. A ring-shaped retainer with a reduced diameter that adheres to the inner wall of the main pipe and prevents the optical fiber cable and messenger wire from sagging without obstructing the flow of sewage is attached to the messenger wire at every predetermined interval via a binding string. Insert a plurality of hooks in advance, insert the optical fiber cable and messenger wire into the tube, and after tensioning the messenger wire, expand the inner wall of the main tube by heating the holder made of shape memory alloy The messenger characterized in that the optical fiber cable and the messenger wire are laid on the upper part of the inner wall of the main pipe in close contact with each other A laying method for an optical fiber cable using the ear tensioning device.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view showing an example of a messenger wire tensioning device according to the present invention.
In the present invention, when an optical fiber cable is laid along the inner wall upper portion 12 of the underground main pipe 11 connecting the manholes 10 and 10, the optical fiber cable 20 is slidably locked using a number of hooks or clamps 21. The messenger wire 22 has been tensioned. For messenger wires, steel cords or steel wires with a diameter of 4 to 6 mm are usually used, but high-strength and low-stretch fibers such as aramid fibers and kepla fibers (for example, Kashimori Kogyo: trade name Cosmo Line) May be. In that case, it is preferable to use a rope coated with a resin of an anticorrosive agent (repellent) and connect a wire rope of a predetermined length to both ends thereof.
[0007]
As shown in the drawing, the locking side of the messenger wire 22 is hooked on locking means 30 (FIGS. 2 to 4) provided on the inner wall of the manhole, and the other end of the messenger wire 22 is disposed in the manhole with a space from the manhole. And is wound around a winding mechanism 40 (FIGS. 5 and 6) provided on the inner wall. Further, round bars or tubular guide members 14 are attached to the upper edges 13 and 13 of the abutting openings of the manholes 10 and 10 and the main pipe 11 in order to guide the messenger wire 22 toward the locking means and the winding mechanism. . The optical fiber cable 20 inserted into the pipe is introduced into each home through a branch pipe branched from the main pipe and a sewage drain (not shown).
In the figure, 15 is a scaffold provided directly on the manhole, 16 is a light branch box, 17 is an invert on the bottom of the manhole, 18 is a manhole cover, 19 is an anchor bolt for fixing the guide member 14, and 29 is a cable retainer. The saddle.
[0008]
The manhole 10 is determined to be installed with a maximum spacing of 75 m, 100 m, and 150 m when the tube diameter is 600 mm or less, 1000 mm or less, and 1500 mm or less. It is also installed at locations where the relationship changes or where pipes meet. When laying the main pipe, it is constructed with a predetermined angle of inclination and with the level of the manhole bottom and the pipe bottom of the main pipe matched.
A manhole usually has an invert 17 fixed on an underground foundation created by excavating to a predetermined depth, and a wall rise, slab, straight wall, slant wall, etc., which are factory products, are assembled on the pipe. When the bottom is deep, it is made of cast-in-place concrete. The invert 17 is for forming a semicircular groove that is rubbed with the bottom of the downstream pipe to smoothly pass the filth. As a sewerage pipe facility, a branch flow system that separates rainwater and sewage separately leads branch pipes drawn from the sewage main to each doorway or household sewage (not shown).
[0009]
2 is a front view of the rope locking means, FIG. 3 is a side view, and FIG. 4 is a plan view.
As described above, the locking means 30 for latching the rear end of the messenger wire 22 is attached to the bracket 32 of the plate 31 fixed to the anchor 37 on the manhole straight wall. The bracket 32 is inserted with an eyebolt 33 having a ring portion or hook 34 for hooking the end of the messenger wire, a coil spring 35 is provided around the eyebolt 33, and a spring receiver 36 is screwed onto the upper end of the eyebolt. .
[0010]
FIG. 5 is an enlarged front view of a messenger wire winding mechanism, and FIG. 6 is a side view. The distal end side of the messenger wire is pulled out to the manhole through the guide member 14 and is wound around a winding mechanism (lashing mechanism) 40 provided on the inner wall thereof.
The hoisting mechanism 40 is configured to wind the messenger wires 22 and 22 by rotatably attaching the winding drums 43 and 43 to brackets 42 and 42 of a plate 41 fixed to the manhole straight wall by an anchor 38. Claw wheels 45 are provided at the outer ends of 44 and 44 to be engaged with the claws 46 and 46 on the bracket side, and an engagement hole 47 of a ratchet wrench (not shown) which is a shaft rotating tool is provided at the shaft end. (Or engaging protrusions) are formed.
The front end side of the messenger wire 22 is wound around a winding mechanism 40 provided on the inner wall of the manhole, the ratchet wrench is engaged with the engagement hole 47 (or engagement protrusion), and the winding drum 43 is driven by a turning operation to drive the messenger wire 22. The optical fiber cable 20 can be laid in the pipe with tension. Although the example of illustration showed the case where two cables were inserted in a manhole and it was tense with two winding mechanisms 40, you may install only one. The rope locking means 30 and the winding mechanism 40 are installed in the vicinity of 400 mm below the scaffold in the manhole. Instead of the ratchet type winding mechanism, it is possible to use a band tightening machine as described in Japanese Patent Publication No. 3-75765 and Japanese Patent Application Laid-Open No. 2000-62832.
[0011]
In addition, when inserting the optical fiber cable and the messenger wire into the pipe, a messenger (not shown) is provided that prevents the optical fiber cable and the messenger wire from drooping in close contact with the inner wall of the main pipe and preventing the sewage flow. Hang at predetermined intervals of the wire. Not only such a holder but also a holder made of shape memory alloy, which is inflated and adhered to the inner wall of the main pipe by heating after inserting the optical fiber cable and messenger wire into the pipe, is hung at predetermined intervals of the messenger wire. You may stop.
FIG. 12 shows a shape memory alloy-made holder, (a) is a front view before expansion, and (b) is a front view after expansion. As shown in FIG. 12a, the holder 51 is hooked with a tie string 52 at predetermined intervals (for example, at intervals of 10 m) of the messenger wire 22, and is 40 to 70 ° C. or higher after the messenger wire 22 is inserted. By blowing the above hot air, the optical fiber cable 20 and the messenger wire 22 are placed in tension in the upper part of the inner wall of the underground main pipe in close contact with the inner wall of the main pipe as shown in FIG. 12b. Since the holder 51 is disposed in contact with the tube bottom with a thickness of about several mm, it does not hinder the flow of sewage.
Note that a weight (not shown) may be formed on a part of the holding jig so that the holder after the expansion comes into close contact with the inner wall of the main pipe. For example, it may be a flat plate that extends slightly in the tube axis direction, or a comb that straddles two adjacent holding jigs. Further, not only a holder that expands in a ring shape, but also a notch circle or a member that expands in a partially overlapping ring shape (not shown) may be used.
[0012]
Next, a construction example will be described.
First, the main sewage pipe is 200 mm in diameter, and the manholes 10 are usually installed at intervals of 75 m, 100 m and a maximum of 150 m. ,
(1) The optical fiber cable 20 is hooked on a messenger wire (4 mm diameter) 22 of a required length using a number of hooks 21.
{Circle around (2)} A stringer (not shown) is passed through the underground main pipe (main pipe) 11 with a wire machine, and the front end of the messenger wire 22 with the optical fiber cable 20 hooked is passed. When the distance between manholes is short, a piano wire is directly drawn without using a wire machine, and when the distance is large, a robot-type wire machine or a special jig is used.
(3) Tie the messenger wire 22 to the end of the connected string.
(4) The rear end of the messenger wire 22 is bound to the eyebolt 33 of the locking means 30 and the other end is hooked to the winding drum 43 of the winding mechanism 40.
(5) The winding mechanism 40 is operated to tension the messenger wire 22 (for example, the elongation is 250 kgf).
(6) After the tension, mark the rest position of the eyebolt 33 with respect to the bracket or manhole wall (for example, the rest height position of the receiver).
(7) During regular inspection after construction, the extension of the messenger wire 22 is detected by the displacement of the eyebolt 33 with respect to the bracket, and the spring receiver 36 is rotated to adjust the tension of the messenger wire.
[0013]
As described above, since the optical fiber cable 20 is slidably coupled to the messenger wire 22, when the optical fiber cable is laid in an underground pipe such as a sewage pipe, the messenger wire is tensioned to form the optical fiber cable. It can be laid without applying tension. In particular, the fiber cable can be smoothly laid smoothly without causing a sag by simply winding the messenger wire 22 by operating the winding mechanism installed in the manhole without using a large apparatus.
[0014]
FIG. 7 is a front view of a second example of the winding mechanism.
In this winding mechanism 40, an engagement protrusion 48 is formed instead of providing an engagement hole at the end of the shaft 44, 44 in FIGS. 5 to 6, and a ratchet wrench is fitted to the engagement protrusion 48. The messenger wire 22 is wound and tensioned by the rotation.
[0015]
FIG. 8 is a front view in the case where the winding mechanism 40 and the locking means 30 are provided on the common large plate 28, and an engagement protrusion 48 is formed at the end of the shaft 43, as in the previous example. A ratchet wrench is fitted to the mating protrusion 48, and the messenger wire 22 is tensioned by its rotation.
[0016]
FIG. 9 shows another example of the winding mechanism, where (a) is a front view and (b) is a plan view. In this example, two hoisting mechanisms 40 and 40 each having a winding drum 45 with a pinion wheel with a shaft 44 vertical are axially supported vertically in a manhole 10 and an eyebolt 39 is provided near the winding drum. , 39, and two messenger wires 22 drawn along the straight wall of the manhole are wound up by changing the direction in the horizontal direction by the ring portion 34 of the eyebolt 39 .
[0017]
FIG. 10 is a side view showing another example of the locking means and the guide member, and FIG. 11 is a perspective view of the bent metal guide member in FIG. In this example, a high-strength, low-stretch fiber coated rope is used as the messenger wire 22a, and at one or both ends, a binding portion 26 is provided to connect the wire rope 23, and the rear end of the wire rope 23 is connected to the eyebolt. Alternatively, it is passed through the turnbuckle and locked to the locking means 30, and the tip is wound around the winding drum of the winding mechanism. The illustrated example shows a case where a turnbuckle 48 is used instead of an eyebolt having an adjusting function. The upper end of the turnbuckle 48 is hooked to an anchor bolt 39 fixed to the inner wall of the manhole, and the wire rope 23 connected to the tip of the messenger wire 22a is connected to the lower end of the turnbuckle. Further, a Y-shaped bending metal rod is used as the guide member 50.
Also in this case, the extension of the messenger wire 22a is detected by the displacement of the turnbuckle 48 with respect to the bracket at the time of periodic inspection after construction, and then the tension of the messenger wire is adjusted by rotating the turnbuckle. .
[0018]
【The invention's effect】
As described above, according to the present invention, when an optical fiber cable slidably coupled to a messenger wire is laid in an underground pipe, a tension device having a simple structure and easy operation is installed in the manhole. Since the wire is tensioned, it is possible to lay the cable without causing the cable to hang down without applying tension to the optical fiber cable.
Further, it is possible to construct an optical fiber cable network at a low cost without requiring an expensive device such as a laying robot. Furthermore, since the messenger wire supporting the optical fiber cable is laid in a tensioned state along the upper portion of the inner wall of the pipe, there is no possibility that filth is entangled in the terminal processing portion of the messenger wire.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of a messenger wire tensioning device of the present invention.
FIG. 2 is an enlarged side view of the locking means at the rear end of the messenger wire.
FIG. 3 is a front view of FIG. 2;
4 is a plan view of FIG. 2. FIG.
FIG. 5 is a front view of a winding mechanism at the tip of a messenger wire.
6 is a side view of FIG. 5. FIG.
FIG. 7 is a front view of another example of a winding mechanism.
FIG. 8 is a front view when a locking means is provided on the side of the winding mechanism.
9A and 9B show still another example of a winding mechanism, where FIG. 9A is a front view and FIG. 9B is a plan view.
FIG. 10 is a side view showing an example in which a resin-coated rope is a messenger wire, and wire ropes are connected and locked at both ends thereof.
11 is a perspective view of a bent metal-shaped guide member in FIG.
12A and 12B show a shape memory alloy holder, wherein FIG. 12A is a front view before expansion, and FIG. 12B is a front view after expansion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Manhole 11 Underground main pipe 12 Upper part in main pipe 13 Upper edge part 14 in opening part Guide 15 Scaffold 16 Optical branch box 17 Lid 18 Invert 19, 43 Anchor bolt 20 Optical fiber cable 21 Hook 22, 22a Messenger wire 23 Wire rope 26 Bundling portion 28 Plate 29 Saddle 30 Locking means 31 Plate 32 Bracket 33 Eye bolt 34 Ring portion 35 Rod portion 36 Spring receiver 36 Coil springs 37, 38, 39 Anchor 40 Lifting mechanism 41 Plate 42 Bracket 43 Winding drum 44 Shaft 45 Claw wheel 46 Claw 47 Wrench engagement hole 48 Protrusion for fitting 49 Turnbuckle 50 Guide member 51 Holder 52 Binding string

Claims (3)

When laying the optical fiber cable on the inner wall upper part of the underground main pipe connecting the manholes, it is a device for tensioning the messenger wire that hangs the optical fiber cable slidably and bears the tension,
At least one locking means provided on the manhole straight wall portion above the upper edge of the abutment opening between the manhole and the underground main pipe to lock one end of the messenger wire;
In order to wind up the other end of the messenger wire, a manhole straight wall spaced apart from the manhole above the abutting opening upper edge of the abutting opening between the manhole and the underground main pipe spaced apart from the manhole At least one latching winding mechanism provided in the part;
A guide member fixed to the upper edge of the abutting opening between the manhole and the underground main pipe, the messenger wire inserted into the main pipe being directed toward the latch type winding mechanism or the locking means. In order to guide along the outer periphery, it consists of a round bar or a tubular guide member fixed to the upper edge of the abutment opening between the manhole and the underground main pipe so as to be orthogonal to the main pipe axis direction,
The locking means includes a bracket fixed to a manhole straight wall, an eyebolt inserted through the bracket and having a latching ring or hook at the end of a messenger wire at a lower end, and one end of the eyebolt being contracted around the eyebolt. A coil spring placed on the bracket and a spring receiver screwed onto the upper end of the eyebolt and pressing the other end of the coil spring from above,
The latch-type winding mechanism is provided with a ratchet wheel on the shaft end of the winding drum for winding the messenger wire end to be engaged with the claw on the winding drum support bracket side, and at the shaft end, the shaft turning tool The messenger wire tensioning device is characterized in that an engagement hole or an engagement projection adapted to the above is formed. When laying the optical fiber cable on the inner wall upper part of the underground main pipe connecting the manholes, it is a device for tensioning the messenger wire that hangs the optical fiber cable slidably and bears the tension,
At least one locking means provided on the manhole straight wall portion above the upper edge of the abutment opening between the manhole and the underground main pipe to lock one end of the messenger wire;
In order to wind up the other end of the messenger wire, a manhole straight wall spaced apart from the manhole above the abutting opening upper edge of the abutting opening between the manhole and the underground main pipe spaced apart from the manhole At least one latching winding mechanism provided in the part;
A round bar or tubular guide member fixed to the upper edge of the abutting opening of the manhole and the underground main pipe so as to be orthogonal to the main axis direction, and the messenger wire inserted into the main pipe is latched A round bar or a tubular guide member for guiding along the outer periphery of the guide member toward the type winding mechanism or the locking means,
The locking means includes a bracket fixed to a manhole straight wall, an eyebolt inserted through the bracket and having a latching ring or hook at the end of a messenger wire at a lower end, and one end of the eyebolt being contracted around the eyebolt. A coil spring placed on the bracket and a spring receiver screwed onto the upper end of the eyebolt and pressing the other end of the coil spring from above,
Said latching winding mechanism, as well as supporting the ratchet wheel with the winding drum which is perpendicular to the rotation axis in the manhole, provided eyebolts near the winding drum, a messenger wire end through pulling along the manhole straight wall wherein A messenger wire tensioning device that changes the direction in the horizontal direction at the ring part of the eyebolt. A method for laying an optical fiber cable using the messenger wire tensioning device according to claim 1,
When inserting the optical fiber cable and the messenger wire into the pipe, a ring-shaped holder having a reduced diameter that prevents the sagging of the optical fiber cable and the messenger wire without sticking to the inner wall of the main pipe and preventing the sewage flow. , Insert a plurality of pre-hanging on the messenger wire at predetermined intervals via a binding string ,
The optical fiber cable and the messenger wire are inserted into the pipe, and after tensioning the messenger wire, the holder made of a shape memory alloy is heated and inflated and adhered to the inner wall of the main pipe, and the optical fiber cable and the messenger An optical fiber cable laying method using a messenger wire tensioning device, characterized in that a wire is laid on an upper portion of an inner wall of a main pipe.

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