JP4256972B2 - In-pipe cable laying method, laying device and fume pipe used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-pipe cable laying method, a cable laying vehicle that pulls a cable such as an optical fiber into a relatively small-diameter sewer pipe, etc., and is automatically fixed to a pipe inner wall by a self-running cable laying car, a laying device for the same Related to Hume tube .
[0002]
[Prior art]
With the rapid development of the information society in recent years, the expansion of information communication means that is desired. In urban areas and surrounding areas, the expansion of information communication means is being recognized as an urgent issue. For example, new communication means using optical communication cables have attracted attention and have been adopted for various communications.
Such a new communication cable is often laid on the inner wall of a relatively large diameter pipe such as a sewer main. In the case of a large diameter pipe, the cable is fixed to the inner wall of the pipe manually using fasteners. However, the demand area for communication cables tends to expand rapidly, and it is difficult to meet the demand sufficiently by simply using the sewer main as in the conventional case. Compared to existing sewer branches, etc. The current situation is that communication cables are laid on the inner wall of pipes that are small in diameter and cannot be entered by people.
[0003]
For example, according to Japanese Patent Publication No. 3-50483, a carriage is automatically run in a sewer branch pipe, an optical fiber cable drawn into the pipe in advance is lifted by an arm of the carriage, and the cable is pressed to a predetermined position on the inner wall of the pipe. Fixing means arranged on the carriage, that is, a pair of holes are formed in the inner wall of the pipe by a drill, a U-shaped cable holder leg is inserted into the drill hole, and press-fitted by a striker to fix the cable to the inner wall of the pipe An in-pipe cable laying method and apparatus are disclosed.
[0004]
[Problems to be solved by the invention]
It is possible to lay an optical fiber cable in a small-diameter sewer branch pipe using the above-described pipe cable laying device, but it is troublesome to provide a drill hole in the inner peripheral wall of a narrow pipe and drive the cable holder. It took time.
Moreover, the laying device, drills for inserting the foot of the holder to the inner circumferential wall of the tube, housing portion of the cable holder, and requires the delivery mechanism and the striker or the like of the holder, equipped with a lighting and surveillance cameras, etc. Therefore, the apparatus is complicated and it is difficult to reduce the size.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. An in-pipe cable laying method capable of facilitating in-pipe work and further reducing the size of the apparatus and using the in- pipe cable laying apparatus and the laying apparatus therefor And it aims at providing the fume pipe | tube used for it.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the in-pipe cable laying method according to the present invention includes a cable holder inserted from the outside of the fume pipe, a cable holder attached in advance to the inner wall of the pipe, and the pipe being embedded. Then, the cable was drawn into the pipe, and a cable laying vehicle supporting the cable was put in the pipe to run, and the cable was delivered to the holder.
Moreover, laying apparatus in the tube cable of the present invention in order to achieve the above object fixed, a cable holder provided with a narrow cable insertion opening than the thickness of the cable, the inner peripheral wall of the outside from the pipe of the pipe before burying After the tube was embedded using the above-described fume tube, a guide arm for holding the cable in the holding tool and guiding the holding tool while supporting the cable drawn into the tube was provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method for laying an in-pipe cable according to an embodiment of the present invention, a laying device therefor, and a fume pipe used therefor will be described with reference to the drawings.
1 to 3 show a cable laying vehicle 1 that fixes a cable drawn into a sewer pipe to an inner wall of the pipe. The laying vehicle 1 is provided with driving wheels 3 on both sides of the frame 2, and extended wheels 4 are provided outside the driving wheels 3. The drive wheels 3 are connected to a travel drive unit 5 provided on the frame 2, whereby the laying vehicle 1 travels in the pipe both before and after.
[0007]
As shown in FIG. 4, an extension axle 9 can be attached to the drive wheel 3 . By attaching the extension wheel 4 to the extension side end of the extension axle 9, the extension wheel 4 can be extended in the vehicle width direction. The travel drive unit 5 is provided with an electric motor (not shown) that rotates the drive wheels 3 and the extension wheels 4.
As shown in FIG. 1, a turning drive unit 6 is provided in front of the travel drive unit 5. The turning drive unit 6 supports the front construction drive unit 7 and the monitoring unit 8 and rotates them in the direction of arrow a by an electric motor (not shown).
[0008]
The construction drive unit 7 is provided with an arm 10 that can move up and down by the action of compressed air. A substantially U-shaped cable catcher 11 for placing a cable such as an optical fiber is provided on the upper portion of the arm 10. The monitoring unit 8 is provided with a front camera 13 for photographing the front of the cable-laying vehicle 1 and a pair of front lights 14 for illuminating the front. A construction portion camera 15 and a construction portion light 16 for photographing the upper side of the cable catcher 11 are attached to the upper portion of the monitoring portion 8.
[0009]
As shown in FIG. 5, in the cable laying vehicle 1, a spacer 21 can be attached between the arm 10 and the cable catcher 11 in order to correspond to a relatively large sewer branch pipe or the like. At this time, the extension axle 9 of the extension wheel 4 is also attached according to the inner diameter of the pipe. Several lengths of the spacers 21 and the extension axles 9 may be provided so as to correspond to various lengths according to the inner diameter of the pipe.
When the spacer 21 is used, the cameras 13 and 15 and the lights 14 and 16 of the monitoring unit 8 are also lifted upward using the spacer 22 . The power cable is also extended using the relay cord 23.
[0010]
As shown in FIG. 1, the cable laying vehicle 1 has a power cable 18 for supplying electricity to a motor such as an air tube 17 that feeds air for moving the arm 10 of the construction drive unit 7 up and down, a rotation drive unit 6, and the like. The power cable connecting portion 19 for supplying electricity from the outside is provided at the rear portion of the cable laying vehicle 1 . Although not shown, air is supplied by connecting an air tube from an external compressor .
In the present embodiment, the laying vehicle 1 has an overall length of about 800 mm, an overall height of 198 mm, an overall width of 257 mm, and can be used for a sewer pipe having an inner diameter of 300 mm (see FIG. 3). The total width when the extension axle 9 is attached to the laying vehicle 1 is 522 mm. In this state, it can correspond to a sewer pipe having an inner diameter of 600 mm (see FIG. 4). Although not shown in the drawings , the in- pipe cable laying device of the present invention is provided with a remote control device for operating the laying vehicle 1 and a monitor for projecting the video of the camera.
[0011]
FIG. 6 shows a part of a concrete sewer pipe (hereinafter referred to as a fume pipe) 25. The fume tube 25 is provided with a cable holder 26 at a position located on the upper side in a state where the fume tube 25 is embedded. In the present embodiment, when the fume tube 25 is manufactured, a mounting hole 33 for arranging the cable holder 26 is provided in advance. A step 34 is formed in the mounting hole 33. On the other hand, the cable holder 26 is attached to the fixture 35, the fixture 35 is placed on the step 34 of the mounting hole 33, the cable holder 26 is screwed onto the nut 32, and then fixed with the mortar 36. In the figure, reference numeral 37 indicates a vertical line of the fume tube 25, and 38 indicates a horizontal line.
[0012]
The cable holder 26 is formed of an elastic member such as a synthetic resin, and as shown in FIG. 7A, a screw portion 27 for attaching to the fume tube 25 side and a holding portion 29 for holding the cable 28 are provided. . The holding part 29 is substantially U-shaped, and an insertion opening 30 for the cable 28 is formed in the lower part. The insertion opening 30 is provided with an inclined surface 31 that narrows toward the inside of the holding portion 29, and the narrowest portion is smaller than the diameter of the cable 28. In the cable holder 26, when the cable 28 is pressed against the inclined surface 31, the insertion opening 30 is pressed against the peripheral surface of the cable 28 to expand (see FIG. 7), and the cable 28 is inserted into the holding portion 29. Then, it will be restored to its original state by elastic force. Therefore, the cable 28 does not fall out of the holding portion 29. If the cable 28 has elasticity, the cable holder 26 does not necessarily need to be an elastic body.
[0013]
Next, a method for laying the cable 28 in the buried fume tube 25 will be described.
As described above, a plurality of cable holders 26 are attached to the fume tube 25 in advance. In order to pull the cable 28 into the fume tube 25, a cable pull-in vehicle of another device may be run, or a person gets down to a manhole provided at predetermined intervals, and the cable 28 is manually pulled into the fume tube 25. Good.
The cable laying vehicle 1 places this at the entrance of the fume tube 25 and places the cable 28 on the cable catcher 11. The arm 10 is kept in a contracted state. (See Figure 8)
[0014]
When the cable laying vehicle 1 is run in this state, the laying vehicle 1 moves forward in the fume pipe 25 with the cable 28 placed on the cable catcher 11, and the cable catcher 11 moves while sliding on the cable 28. At this time, each front light 14 illuminates the front, the construction portion light 16 illuminates the ceiling in the tube, and the front camera 13 and the construction portion camera 15 project the images in the tube on the monitor. When the first cable holder 26 is visible, the position of the laying vehicle 1 is adjusted so that the cable catcher 11 is positioned slightly in front of or behind the cable holder 26.
[0015]
When the arm 10 is extended upward, as shown in FIG. 7, the cable 28 is lifted and abuts against the inclined surface 31 of the cable holder 26, and when the arm 10 is further extended upward, the cable 28 is inserted into the insertion opening 30. And the cable 28 is accommodated in the holding portion 29. By repeating this operation, the cable 28 is laid in the fume tube 25 as shown in FIG.
In addition, when the laying vehicle 1 stops in a state where it is inclined in the fume tube 25, the direction in which the arm 10 is extended may not match the position of the cable holder 26. In such a case, as shown in FIG. 1, the construction drive unit 7 and the monitoring unit 8 of the laying vehicle 1 are turned and adjusted.
As described above, according to the present embodiment, the cable placed on the cable catcher can be attached simply by extending the arm, and the drilling work or the like that has been conventionally performed can be omitted. Therefore, the work can be facilitated and the time can be shortened, a complicated mechanism such as a drill or striker is not required, the apparatus can be simplified and miniaturized, and the cost can be reduced.
[0016]
The embodiment of the present invention has been described above. Of course, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.
When the cable holder 26 is attached to the fume tube 25, as shown in FIG. 9, the fitting 39 and the stopper 40 of the cable holder 26 are embedded in the fume tube 25 when the fume tube 25 is formed. After forming the fume tube 25, the cable holder 26 may be attached to the female screw formed on the attachment fitting 39.
[0017]
【The invention's effect】
As described above, according to the present invention, a fume pipe is formed in advance by leaving a mounting hole in the pipe wall, a holder is inserted into the mounting hole from the outside of the pipe, and the cable holding portion is provided in the pipe. Thus, since the cable holder is attached to the pipe such as the sewer pipe, the drilling work or the like that has been performed on the inner peripheral wall of the small-diameter pipe after the embedding can be omitted. Therefore, the cable laying operation for the small-diameter pipe is facilitated, and the time can be shortened. Moreover, it is not necessary to equip a complicated mechanism such as a drill or striker, and the apparatus can be simplified and reduced in size, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a cable laying vehicle of an in-pipe cable laying device according to an embodiment of the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is a rear view showing the state in which the extension wheels of the cable-laid car of FIG. 3 are extended in the vehicle width direction.
5 is a side view showing a state in which a spacer is attached to an arm or the like of the cable laying vehicle in FIG. 2. FIG.
FIG. 6 is a cross-sectional view showing a state in which the cable holder is attached to the fume tube according to the embodiment of the present invention.
FIG. 7 is a front view for explaining a method of holding a cable by a cable catcher on a cable holder.
FIG. 8 is a perspective view of the same.
FIG. 9 is a cross-sectional view showing a state in which a cable holder is attached to a fume tube according to a modification.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cable laying vehicle 3 Drive wheel 4 Expansion wheel 9 Expansion axle 10 Guide arm 11 Cable catcher 13, 15 Camera 14, 16 Light 21, 22 Spacer 25 Hume pipe 26 Cable holder 29 Holding part 30 Cable insertion opening 31 Inclined surface 33 Installation Holes 35, 39

Claims (4)

A fume tube is formed leaving a mounting hole in the tube wall, and a holder made of an elastic material having a cable holding portion and a cable insertion opening is inserted into the mounting hole from the outside of the tube, and the cable holding portion of the holding fixture is inserted. The holder is fixed to the inner wall of the pipe with a mortar so that the cable insertion opening opens toward the center of the fume pipe , and this pipe is placed so that the cable holding part is at the top. After burying , pull the cable into the pipe, put the cable laying car in the pipe, run the cable supported by the cable laying car, and attach the cable to the holder by the vertical movement means provided in the cable laying car A characteristic method for laying in-pipe cables. A cable laying vehicle 1 for carrying out the pipe laying method according to claim 1, wherein the cable laying vehicle 1 operates the arm 10 and the arm 10 that move up and down to attach the cable 28 to the holder 26. An in-pipe characterized by comprising the construction drive unit 7 and a substantially U-shaped cable catcher 11 provided at the tip of the arm 10 for guiding the cable 28 to the holder 26 while supporting the cable 28. Cable laying device. The holder 26 includes a portion fixed to the tube 25 and a cable holding portion 29, and the holding portion 29 is provided with a cable insertion opening 30 narrower than the thickness of the cable 28 so as to open toward the center of the tube. The laying device for an in-pipe cable according to claim 2. The fume tube 25 is formed in the tube wall leaving the mounting hole 33 penetrating the tube wall, the holder 26 is inserted into the mounting hole 33 from the outside of the tube, and the cable holding portion 29 is connected to the cable insertion opening 30. Projecting into the tube so as to open toward the center of the fume tube, the fixing portion of the holder 26 is attached to the inner wall of the tube 25 by the mortar 36 , and the cable insertion opening 30 is formed narrower than the thickness of the cable 28. A fume pipe for installing an in-pipe cable.

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