JP2002305821A - In-conduit working device for laying communication cable in underground conduits, and communication cable laying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-conduit working device for laying communication cables in underground conduits and a communication cable laying method, which can easily lay the communication cables in branch conduits by one worker, who has no necessarily working skill, on the ground when the communication cables laid in a main conduit are drawn out from the main conduit and laid in the respective branch conduits. SOLUTION: This in-conduit working device 1 for laying communication cables in underground conduits is used when the communication cables are laid in underground conduits comprising a main conduit and one or more branch conduits branched from the main conduit. The in-conduit working device 1 has a casing 2 which can be inserted into the branch conduit 2, a hollow shaft 5 which can be turned in the circumferential direction of the casing 2, a working jig 20 which is detachably attached to the tip of the hollow shaft 5, and a TV camera 3 provided in front of the casing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sewer pipe, communication,
When laying a communication cable in an underground conduit such as a power pipe, the communication cable can be easily connected from the ground to the main pipe of the underground pipeline and multiple branch pipes connected to the main pipe. The present invention relates to a communication cable laying pipe working device and a communication cable laying method that can be laid.

[0002]

2. Description of the Related Art At present, as a national project, an IT strategy has been proclaimed, and construction of a high-speed / ultra-high-speed network, which is a means for transmitting information, is urgent. There are two methods of laying the communication cable that is the medium: overhead and underground.However, laying the communication cable by the underground method is more difficult than laying by the overhead method. It protects the beauty of landscapes, etc., and is resistant to disasters such as earthquakes and typhoons. In particular, in the case of sewer pipes, a branch pipe (attachment pipe) connected to the main pipe has already been led to each home, and the upper part of the pipe has an empty space, and an FTTH (Fiber To The) which leads a communication cable to each home. Home
e) It is drawing attention as an important infrastructure for planning.

[0003] On the other hand, as a communication cable, an optical fiber cable, which has much better performance than a metal cable used so far, has attracted attention. The optical fiber cable is made of thin fibers of glass or plastic, uses light as an information carrier, and sends a signal obtained by digitizing information such as sound and image (a signal of 1, 0). Compared with metal cables, optical fiber cables are superior in terms of broadband, low loss, immunity to electromagnetic radiation, light weight, small size, security and confidentiality, and can flow tens to hundreds of times more information volume, It has excellent characteristics as a communication medium.

In the FTTH project, which is a system using optical fiber cables, it is considered that each house is divided into 200 to 500 small blocks and controlled, and each block is used for public facilities such as a public hall and a police station. Is assumed to be a communication base, and optical fiber cables will be laid to each house.

When laying an optical fiber cable in each house using a sewer pipe, the optical fiber cable passes through the branch pipe from the sewer main pipe, and is branched into a branch pipe basin at the end of the branch pipe (a sewage basin, in a residential area or on a road). ) Is led to each house by digging underground.

As a technique for laying a communication cable such as an optical fiber cable in an underground pipe such as a sewer pipe, a robot method for fixing the communication cable in the pipe, a saddle method, a sheath pipe method, a draining method and the like are proposed. Have been.
These methods disclose means for laying a communication cable in an underground pipeline, and mainly relate to laying in an underground pipeline main line.

[0007]

The communication cables are laid in each branch pipe after the communication cables are laid in the underground pipeline main pipe, and then the communication cables are drawn out from the main pipe to the respective branch pipes. ing. At this time, a plurality of workers were required, such as a worker who took a picture of the inside of the main pipe and the branch pipe with a TV camera or the like and a worker who pulled up the communication cable to the branch pipe box. In addition, these operations must be performed on a communication cable or the like at the branch pipe port about 5 m away from the branch basin (above the ground). Therefore, a work jig and a TV camera are attached to the tip. Working with long rods from the ground required some skill. The present applicants have proposed in Japanese Patent Application No. 2000-368222 a method of laying a communication cable above an underground conduit. In the invention, in order to securely lay the communication cable above the underground pipeline, the guide member shown in FIG. From the upper part of the main pipe to the upper part of the branch pipe. Further, in the branch pipe, it is disclosed that the fixing member shown in FIG. 14 is arranged on the upper side of the inner surface of the trough of the curved pipe formed in the branch pipe, and the communication cable is laid on the upper part of the branch pipe. . However, as a method of arranging these members, a special jig such as a hook-shaped jig or an expansion bag attached to the tip of the rod is individually inserted from the branch tube side, and further, a TV camera is inserted so that the jig is arranged at the position where the jig is arranged. The operation is performed by human power on the side of the branch tube while observing the vicinity, and arranging the guide member and the fixing member at the correct positions has been a task requiring more skill.

The present invention has been made in view of such a background, and when a communication cable laid in the main pipe is pulled out from the main pipe and laid in each branch pipe, one worker can easily operate on the ground. It is an object of the present invention to provide a communication cable laying pipe working device capable of easily laying a communication cable in a branch pipe without requiring a skill level of the work. I do. Furthermore, at the branch pipe opening, a method for correctly arranging a guide member for guiding the communication cable from the upper side of the main pipe to the upper side of the branch pipe, ,
It is an object of the present invention to provide a method for arranging a fixing member for laying a communication cable on a branch pipe at a correct position.

[0009]

According to a first aspect of the present invention, there is provided an in-pipe working apparatus for laying a communication cable in an underground pipeline, wherein at least one or more branch pipes are connected to the main pipe. An underground pipe working device for laying a communication cable in an underground pipeline used when laying a communication cable in an underground pipeline, comprising: a casing insertable into the branch pipe; and a circumference of the casing. A hollow shaft rotatable in a direction,
A working jig detachably provided at the tip of the hollow shaft,
And a TV camera provided on a front surface of the casing. According to this configuration, since the TV camera, the work jig, and the like are integrally formed in the casing, one worker can work. A work jig is detachably attached to the tip of the hollow shaft. By rotating the hollow shaft, the work jig attached to the tip rotates, so that a branch taken by a TV camera on the ground. By controlling the rotation of the hollow shaft while observing the inside of the pipe, even one worker can easily perform the work. Since the rotation of this hollow shaft is controlled by a motor integrated in the casing, the rotation can be controlled by the operator, and a work jig attached at a point about 5 m or more away from the ground Etc. can be easily operated. For this reason, the necessity of the skill level for the work is eliminated, and the work time is shortened.
Work efficiency is improved.

According to a second aspect of the present invention, there is provided an in-pipe working device for laying a communication cable in an underground pipeline, wherein the casing is connected to a rod so that the casing can be tilted at a rear surface portion. It is. According to this configuration, since the casing is tilted, it is possible to move the casing along a bent pipe in the branch pipe. For this reason, even from the ground, the direction of the casing in the branch pipe can be easily changed, so that the direction of the work jig provided at the tip of the casing can be easily changed. Here, the connection between the casing and the rod can be performed by a universal joint, for example, a ball joint.

According to a third aspect of the present invention, there is provided an in-pipe working device for laying a communication cable in an underground pipeline according to the first or second aspect.
A leg member capable of adjusting the height in the branch pipe is provided on an outer peripheral surface of the casing. According to this configuration, the height of the casing can be adjusted according to the size of the branch pipe.

According to a fourth aspect of the present invention, there is provided an in-pipe working device for laying a communication cable in an underground pipe, wherein the working jig is a hook-shaped jig. According to this configuration, the communication cable in the main pipe located at the branch port can be hooked on one end of the hook-shaped jig and pulled up.

According to a fifth aspect of the present invention, in the in-pipe working apparatus for laying a communication cable in an underground pipeline, the working jig is an expansion bag and is connected to the hollow shaft in the casing. And a fluid supply means for supplying a fluid to be injected into the expansion bag. According to this configuration, by supplying a fluid to the expansion bag, it is possible to hold the guide member that arranges the communication cable at the upper part in the branch pipe, and to place the guide member on the ground in the branch pipe that is photographed by the TV camera. While checking the state, it can be arranged at a predetermined position in the branch pipe.

According to a sixth aspect of the present invention, there is provided a method of laying a communication cable in an underground pipeline in which at least one branch pipe branches from the main pipeline. A casing insertable into the branch pipe, a hollow shaft rotatable in a circumferential direction of the casing, a work jig detachably provided at a tip of the hollow shaft, and a work jig provided on a front surface of the casing. By using a communication cable laying in-pipe working device comprising a TV camera, a hook-shaped jig is attached as the working jig, and the hollow shaft is rotated while viewing an image from the TV camera. The hook-shaped jig is rotated, the communication cable located at the branch pipe opening of the branch pipe is hooked to the tip of the jig, and the communication cable is pulled up to the end of the branch pipe. Jig, expansion bag A guide member that replaces the expansion bag and inserts the communication cable laying pipe working device into the branch pipe in a state where the expansion bag is deflated, and arranges the communication cable along the upper part of the branch pipe. The expansion bag holding the guide member is rotated by supplying the fluid from the hollow shaft, inflating and holding the same, and rotating the hollow shaft while watching the image from the TV camera to rotate the expansion bag holding the guide member. Are positioned in the branch pipe, and the communication cable is laid on an upper side in the branch pipe. According to this method, it is possible to easily operate the hook-shaped jig and the expansion bag, which are working jigs, even from the ground at a distance of about 5 m or more from the branch port, and lay a communication cable in the branch pipe. In this case, the worker can work alone. Further, even when the worker is not skilled in the work, the laying work can be easily performed. Further, the guide member can be reliably arranged at the correct position at the branch pipe opening, and the communication cable can be easily guided from the upper side of the main pipe to the upper side of the branch pipe.

According to a seventh aspect of the present invention, there is provided a method of laying a communication cable in an underground pipeline, wherein a communication cable inserted into a branch pipe branched from the underground pipeline or a call line for replacing the communication cable with the communication cable. A method of laying on an upper part of a branch pipe, comprising: a column-shaped fixing part having an outer diameter substantially corresponding to the inner diameter of the branch pipe near the end of the branch pipe, and having at least a semicircle or more in cross section; The communication cable or the nominal line is inserted into the sliding portion of the fixing member having the communication cable or the sliding portion that slidably holds the communication line laid in the branch pipe, and the cylindrical fixing portion is reduced in diameter, A casing insertable into the branch pipe, a hollow shaft rotatable in a circumferential direction of the casing, and a distal end located on the front surface of the casing; and a work tool provided detachably at the distal end of the hollow shaft. And a TV camera provided on the front surface of the casing, using an in-pipe working device for laying a communication cable, attaching an expansion bag as the working jig, and inflating the fixed member in a reduced diameter state. The expansion bag is packaged, and then the communication cable laying pipe working device is moved into the branch pipe, and the hollow shaft is rotated while watching the image from the TV camera to rotate the expansion bag, thereby fixing the fixing member. Is positioned on the upper side in the branch pipe, and thereafter, the expansion bag is further expanded to release the reduced diameter of the fixing member, and the fixing member is disposed in the branch pipe. It is characterized by being laid on the side. According to this method, it is possible to reliably arrange the fixing member at a correct position on the inner surface upper side of the valley portion of the curved pipe formed in the branch pipe, and it is possible to lay a communication cable on the upper part of the branch pipe. .

According to a eighth aspect of the present invention, there is provided a method of laying a communication cable in an underground pipeline, wherein a communication cable inserted into a branch pipe branched from the underground pipeline or a call line for replacing the communication cable with the communication cable. A method of laying on an upper part of a branch pipe, comprising: a column-shaped fixing part having an outer diameter substantially corresponding to the inner diameter of the branch pipe near the end of the branch pipe, and having at least a semicircle or more in cross section; A sliding part of a fixed member having a communication part or a sliding part for slidably holding a communication cable or a nominal line laid in the branch pipe, a state in which the communication cable or the nominal line is inserted, and a casing insertable into the branch pipe; Pivotable in the circumferential direction of the casing,
In-pipe work for laying a communication cable, comprising: a hollow shaft having a tip located on the front surface of the casing, a work jig detachably provided at the tip of the hollow shaft, and a TV camera provided on the front surface of the casing. Using the device, a holding member for holding the expansion bag and the columnar fixing portion of the fixing member as the working jig is attached, and the holding member holds the columnar fixing portion in a reduced-diameter state, and is deflated. With the extended bag in the cylindrical fixed part inside,
Next, the in-pipe working device for laying the communication cable is moved into the branch pipe, and the expansion bag is rotated by rotating the hollow shaft while watching the image from the TV camera, so that the fixing member is moved to the upper part in the branch pipe. Position on the side,
Thereafter, the expanded bag is inflated to release the cylindrical fixing portion of the fixing member from the holding member to release the reduced diameter state, and the fixing member is arranged in the branch pipe, and the communication cable is moved to the upper side in the branch pipe. It is characterized by laying. According to this method, the expansion bag and the holding member are used as a work jig of the laying pipe working device, and the holding member holds the fixing member when the laying pipe working device moves in the branch pipe. It is possible to move in a deflated state, and it is possible to check the front in the moving direction with a TV camera provided on the casing via the cylindrical fixing portion. Therefore, the moving position into the branch pipe can be reliably grasped, and workability is improved. In addition, it is possible to reliably arrange the fixing member at a correct position on the inner surface upper side of the valley portion of the curved pipe formed in the branch pipe, and it is possible to lay a communication cable above the branch pipe.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the following embodiments.

FIG. 1 is a view showing an embodiment of a working apparatus for laying a communication cable in an underground pipe according to the present invention. FIG. 1A is a front view of a front portion of a communication cable laying pipe working device (hereinafter referred to as a working device) 1 according to the present embodiment, and FIG. -I
1 (c) is a sectional view taken along line AA in FIG. 1 (b).
FIG. FIG. 2 is a cross-sectional view of FIG.
FIG. 3 is a sectional view taken along line II-II ′, and FIG.
FIG. 2 is a sectional view taken along line II ′.

As shown in FIG. 2, the working device 1 according to this embodiment has a cylindrical outer peripheral surface, and its front and rear surfaces are provided with a front part 7 and a rear part 15 having rounded corners. It is attached to form a casing 2.

A hollow shaft 5 is rotatably arranged in a circumferential direction on a central axis of the casing 2 in the cylinder length direction via a first gear 6 by driving of a motor 16, and a front end of the hollow shaft 5 is disposed on a front surface of the casing 2. It penetrates the part 7. The first gear 6 is attached to a motor 16 shaft, and the first gear 6
Tell rotation to zero. The second gear 10 is a clutch shaft 1
2 attached. A clutch 13 is attached to a rear end of the clutch shaft 12. A third gear 11 is provided between the enlarged diameter portion of the clutch shaft 12 and the clutch 13.
The third gear 11 is screwed to the fourth gear 17 attached to the hollow shaft 5 so that an overload is not applied to the motor 16.

The hollow shaft 5 is provided with a fluid passage 8 inside which a fluid passage for inflating an expansion bag, which will be described later, and a screw or the like on the inner periphery so that a working jig can be attached to a tip end portion. A communication hole 9 serving as a mounting portion for the work jig is formed. A fluid supply means 14 having a bendable tube 23 for supplying a fluid is rotatably connected to the other end so that the fluid can be supplied to the communication hole 9 at the distal end.
A plurality of communication holes 9 of the hollow shaft 5 may be formed, and it is also possible to attach a working jig that enables more complicated movement.

A rod 18 is provided on the rear surface 15 of the casing 2.
Are attached to be tiltable. In the present embodiment,
As shown in FIG. 2, the joints are connected by a ball joint 19, but not limited to the ball joint 19, but various universal joints can be used as long as they can be tilted. The rod 18 is made of a flexible material that can be inserted along the bend of the branch pipe, for example,
Those formed of FRP or the like are preferable.

As shown in FIG. 1A, a TV camera 3 and lights 4a, 4b for remotely viewing the front of the apparatus are mounted around the hollow shaft 5 on the casing 2. .

Further, working jigs 20 and 21 for performing various in-pipe operations are attached to the hollow shaft 5. FIG.
Shows a state where the hook-shaped jig 20 is attached. The hook-shaped jig 20 has a hook-shaped tip, and one of these hooks hooks a communication cable located in the main pipe.

FIG. 3 shows a state in which the expansion bag 21 is attached as a working jig. This expansion bag 21
FIG. 3 shows that the fluid supplied from the fluid supply means 14
It is extended as shown in FIG. For this reason, by being expanded, it becomes spherical, and it becomes possible to hold a semicircular or more circular member.

As shown in FIG. 3, the casing 2 may be provided with leg members 22 for adjusting the height of the casing 2 in the branch pipe. In FIG. 3A,
The leg member 22 is a tubular inflatable body, and both ends are hermetically attached to the outer peripheral surfaces of the front part 7 and the rear part 15 of the casing 2 with a tightening band or the like.
A fluid supply port is formed on the outer peripheral surface of the casing 2 so that fluid can be supplied to the space between the outer peripheral surface of the casing 2 and the inner surface of the leg member 22. In FIG. 3B, the leg member 22 is formed of a sled, and has a height that positions the hollow shaft 5 substantially at the center of the target pipeline. In order to prevent the working device 1 from falling over when the working device 1 is moved, the cylindrical shaft is mounted on the casing 2 so that the working device 1 can rotate in the circumferential direction.
Are rotatably held at the front end 7 and the rear end 15 of the camera. These leg members make it possible to adjust the height of the casing 2 in the branch pipe, reduce the contact area between the casing 2 and the branch pipe, and improve the operability by the operator.

The working device 1 having the above configuration
The underground pipeline on which the communication cable is laid has a structure as shown in FIG. In the following description, the underground pipeline will be described as a sewer pipe,
In the present invention, since a jig such as a hook is not directly attached to the inner surface of the underground pipeline, there is no limitation on the underground pipeline system or pipe type to be used. For example, the present invention can be applied to all underground pipelines such as gas pipelines pipelined by steel pipes, water pipelines, rainwater pipelines, and power cable pipelines pipelined by cast iron pipes. Further, in the present embodiment, a communication cable to be laid is described below as an optical fiber cable.

FIG. 4 shows a sewer pipe as an example of an underground pipe. As shown in FIG. 4, the main pipe 31 of the sewer pipe is provided between a manhole 32 and another manhole 33. And from the upper side of the main pipe 31,
Branch pipes 34 and 35 branch at branch ports 36 and 37,
The branch pipes 34 and 35 are connected to branch pipe boxes 38 and 39 for each household (not shown).

Generally, the main pipe 31 is laid at a depth of several meters along the road, and branch pipe openings 36 and 37 are formed at the upper part of the main pipe 31 at an oblique side. After ascending from the ports 36 and 37 at a steep angle, the angle is changed near the surface of the ground and connected to the branch pipes 38 and 39 at a gentle angle.

In this embodiment, first, the inside of the main pipe 31 and the branch pipes 34 and 35 for laying the optical fiber cable is investigated with a TV camera, and the length from the manhole 32 to the manhole 33 (another manhole is interposed therebetween). Numerical data such as the length from the manhole 32 to the branch pipe ports 36 and 37, the length of the branch pipes 34 and 35, and the diameters of the respective pipes are measured. Note that the numerical data can be measured using the TV camera 3 provided in the working device 1 described above. Further, another TV camera can be used. At this time, if there are obstacles (blocks of mortar, branch pipes protruding into the main pipe) in the pipeline, these obstacles are removed by a dedicated obstacle removal machine (not shown, for example, Japanese Utility Model Laid-Open No. 4-32808). ), So that it does not hinder the installation of the optical fiber cable.

Next, a towing line is passed through the main pipe 31.
As a method of wire passing, a method of pushing a rigid body such as a wire, a method of blowing a parachute-like wire tool with air pressure,
A method of connecting to a self-propelled pipe moving vehicle is known, and these known methods can be appropriately adopted.

The trunk optical fiber cable 50, the branch optical fiber cables 51, 52
And the length of the tension members 55, 56, 57 is determined, and each is slidably connected. As an example,
A wire (high-strength low-extensibility) is used for the trunk tension member 55, and a resin coating is applied to the inner and outer surfaces of the branch tension members 56 and 57. It is preferable to use a cylindrical member made of a flexible stainless steel tube into which the super fiber is integrated.

As shown in FIG. 5, it is preferable that the trunk optical fiber cable 50 and the trunk tension member 55 are slidably connected to each other by being inserted into a protective tube 75.

The branch optical fiber cables 51 and 52
And the branch tension members 56 and 57 are slidably connected by inserting a branch optical fiber cable into the branch tension members 56 and 57, and furthermore, in a portion laid in the main pipe 31, As shown in FIG. 5, it is preferable that the protective tube 75 is inserted into the protective tube 75 and is drawn out from the manhole 32 through openings 76 provided at portions corresponding to the positions of the branch pipe openings 36 and 37.

The protective tube 75 only needs to have chemical resistance to the fluid in the main tube 31 and flexibility enough to be inserted through the manholes 32 and 33, and plastics such as polyethylene, polypropylene, polyurethane and polyester, and the like. These are made of fiber reinforced materials, etc.
Has a length corresponding to the length of the pipe, and has a pipe shape having at least one or more spaces continuous in the cylinder length direction, and an opening is provided in a thickness direction at a portion corresponding to a branch pipe opening. Are preferred. Thereby, the optical fiber cable and the tension member can be juxtaposed in the protective tube 75 so as to be slidable with each other in the longitudinal direction. In addition, the shape of the protective tube 75 may be a shape in which a pipe-shaped tube length direction is cut open to form a C-shape, and both ends are overlapped to form a space therein, and in the case of this shape, Is easy because the work of arranging the members inside can be performed from the slit portion.

The protection tube 75 may be implemented as a single tube as shown in FIG. 5, or, for example, as shown in FIG. The optical fiber cables 50, 51, and 52 may be inserted into the respective protection tubes 75. Needless to say, the protection tube 75 may have an integral shape having a plurality of cavities. If the protection tubes 75 are not to be bound, it is necessary to put the trunk tension member 55 in each of the protection tubes 75.

Further, the tension members 55, 56, 5
7 is made of a high-strength, low-elongation material, which extends in parallel with the optical fiber cables 50, 51, 52, and the tension members 55, 56, 57 and the optical fiber cables 50, 51, 52 are mutually lengthened. It is possible to move freely in the direction.

FIG. 7 shows the tension members 55, 56, 5
7, showing ropes, strings, belts, and the like made of high-strength low-extensibility fibers such as polyparaphenylene benzobisoxazole (PBO) fiber, aramid fiber, carbon fiber, metal fiber, and glass fiber. , A stainless steel wire or the like can be used.

The tension members 55, 5
6, 57, the optical fiber cables 50, 51,
52 are arranged side by side in a slightly slackened state, and both of them are partially bound by a binding string 90.

Therefore, in this structure, the optical fiber cables 50, 51, 52 and the tension members 5
5, 56, and 57 are bound by a binding string 90 so that they are partially coupled with some flexibility, and the optical fiber cable 50 is bound between the binding strings 90. , 51, 52 are tension members 5
The length is slightly longer than 5, 56 and 57, and both of them are slidable in the length direction as a whole.

In FIG. 7, the branch tension member 57 inserted into the branch pipe 75 is connected to the trunk tension member 55 in the main pipe 31 at a portion corresponding to the branch pipe port 37 in the main pipe 31. They are bound together by a string 91.

In this manner, after the optical fiber cable is laid in the sewer pipe, the branch pipe 39
When tension is applied to the tension member 57 from above, the tension member 55 can be dragged in the direction of the branch pipe 35 at the branch pipe port 37, and the optical fiber cable 50 is moved to the middle point of the main pipe 31 in the upper part of the main pipe 31. The optical fiber cable 50 can be laid in the main pipe 31 without further loosening.

Next, the branch tension members 56, 5
Each guide member A as shown in FIG. 8 is attached at a branch position of the trunk tension member 55 of FIG. 7, that is, near the opening of the protective tube 75. The guide member A includes branch pipes 34 and 35.
A cylindrical insertion portion 63 having an outer diameter substantially equivalent to the inner diameter of the cylinder and having a cross section of not less than a semicircle, and a member laid in the main pipe 31 continuously projecting downward and outward from the cylindrical insertion portion 63; It comprises a stem slide part 61 that slidably holds, and a branch slide part 62 that slidably holds a member laid in the branch pipes 34, 35 provided in the insertion part 63. The protection tube 75 is slidably passed through the trunk slide portion 61 provided on the guide member A, and the branch tension member 5
6, 57 and the branch optical fiber cables 51 and 52 are slidably passed through the branch slide portion. The stem slide part 61 and the branch slide part 62 may be formed by holes, or may be pipe-shaped (see FIG. 9).

Further, the branch tension members 56 and 57 and the branch optical fiber cables 51 and 52 taken out from the branch slide portion 62 of the guide member A are rounded small so as not to be wound around the protective tube 75 during operation. Is preferred. When the protection tube 75 is not used, the guide member A is attached to the trunk tension member 55.

Next, a method of laying the optical fiber cables 50, 51, 52 in the main pipe 31 and the branch pipes 34, 35 will be described.

First, a tow line is passed between the manholes 32 and 33 in advance. The passage of the tow line can be performed by a known method as described above. A protection tube (tension member 55) 75 is connected to one end of the tow line, the other end of the tow line is pulled, and the protection tube 75 is inserted from the manhole 32 to the manhole 33. Further, the working device 1 is inserted from the branch boxes 38 and 39, and the guide member A is moved by the TV camera 3 mounted on the front portion 7 thereof.
Is located near the branch ports 36 and 37.

When each guide member A is moved in the main pipe 31 when the guide member A may be damaged by friction with the inner wall of the pipe or may be caught by a step of the pipe, the main pipe 31 may be moved.
It is preferable to put on a carrier 92 such as a trolley or a simple ship that can move inside, and pull in at the same time as the towing line.

Next, as shown in FIG. 10, the carrier 92 carrying the protective tube 75 and the guide member A is moved to the branch port 36 in the main pipe 31 of the underground pipe. Also, the working device 1
The hook-shaped jig 20 is attached to the hollow shaft 5 of
The flexible rod 18 is pushed in from above and the tip of the hook-shaped jig 20 is positioned at the branch pipe opening 36 in the branch pipe 34 while checking with the TV camera 3. When the TV camera 3 of the working device 1 locates the branch optical fiber cable 51 branching from the protection tube 75 or the caller 93 attached to the end of the call line immediately below the branch pipe opening 36, the protection tube 75 and the carrier 92 are moved. Stop moving. Next, the hook-shaped jig 20 attached to the working device 1 is pushed into the main pipe 31 by pushing the rod 18, and the hook portion 20 a of the hook-shaped jig 20 is hooked on the caller 93. At this time, the motor 16 in the working device 1 is rotated to rotate the hollow shaft 5 via the gears 6, 10, 11 so that the work is performed while the hook-shaped jig 20 is in a position where it can be easily hooked on the caller. . When the caller 93 is hooked, the rod 18 is pulled back, and the branch optical fiber cable 51 or the call line attached to the working device 1 and the caller 93 is pulled up to the branch tube tub 38. Here, the term “nominal line” refers to a wire such as a wire connected to the tip of the optical fiber cable 51 when the optical fiber cable 51 to be laid is pulled up. The caller 93 has a spherical shape of about 100 mm in which a wire having a thickness of about 1 mm is combined in a ball shape. Further, the caller 93 may be a resin ball having a diameter of about 20 mm, such as a ping-pong ball. Of course, the communication cable may be processed into a shape that can be directly hooked or grasped.

Thus, the optical fiber cable 5
After the optical fiber cable 51 is pulled up to the branching box 38, the pulled up optical fiber cable 51 is prevented from dropping into the branch pipe, and then, as shown in FIG. Attach the expansion bag 21,
It is positioned again at the branch port 36. While watching the video from the TV camera 3 of the working device 1, the protection tube 75 and the carrier 9
2 is moved again in the main pipe 31 so that the guide member A placed on the carrier 92 is positioned immediately below the branch pipe port 36.
Then, the rod 18 is pushed in, the expansion bag 21 is inserted between the cylindrical insertion portions 63 of the guide member, and fluid is supplied from the fluid supply port 14 of the working device 1 to inflate the expansion bag and hold the guide member A. . Thereafter, the work apparatus 1 is pulled up, and the guide member A is fitted to the branch pipe opening 36 while watching the image from the TV camera 3. At this time, the guide shaft A is turned to the correct position of the branch pipe opening 36 by rotating the hollow shaft as described above. As a fixing method of the branch pipe opening 6 of the guide member A, an adhesive or an adhesive is applied in advance to the outer surface of the cylindrical insertion portion 63 of the guide member A, and fixed by contact with the inner surface of the branch pipe 34. Good, cylindrical insertion part 63
An elastic body such as rubber, sponge, or the like may be provided on the outer surface, or a tapered surface may be formed and fixed by compression by friction.

The guide member A may have a shape as shown in FIG. When such a guide member A is used, the cylindrical fixing portion 71 is reduced in diameter with a thin wire or the like, and after insertion into the branch pipe 34, the thin wire is cut and the reduced diameter is released to expand the cylindrical fixing portion 71. Then, the cylindrical fixing portion 71 is fixed in the branch pipe 34. In this case, similarly to the guide member A having the shape shown in FIG. 8 described above, an adhesive or a pressure-sensitive adhesive is applied to the outer surface of the columnar fixing portion 71 in advance and fixed by contact with the inner surface of the branch pipe 34. Alternatively, an elastic body such as rubber or sponge may be provided on the outer surface of the cylindrical fixing portion 71, a stud such as a spike of a tire may be formed, or a tapered surface 74 may be formed to have a tapered shape. It may be fixed.

In the other branch pipes 35, similar operations are sequentially performed, the branch optical fiber cable 52 and the branch tension member 57 are taken out from the branch tub 39, and the guide member A is inserted into the branch pipe opening 37 and fixed. .

Next, a tension member 55 is fixed to the hook on one side by using a tension mechanism 64 in which a manual winch of, for example, a drum type and a hook are attached to the manholes 32 and 33, and the other side is a winch. The protection tube 75 and the respective optical fiber cables and tension members are laid on the upper side in the main tube 31.

When the branch pipes 34, 35 and the like are straight pipes, tension is applied to the branch tension members 56, 57 by the tension mechanism 64 attached to the branch pipe boxes 38, 39 as they are, so that the inside of the branch pipes 34, 35 is changed. The branch optical fiber cables 51 and 52 can be laid on the upper part of the cable.

However, for example, when the branch pipes 34 and 35 are curved pipes as shown in FIG. 4, it is not enough to simply apply tension to the branch tension members 56 and 57 by the tension mechanism 64 attached to the branch pipe boxes 38 and 39. , Branch pipes 34, 3
The optical fiber cables 51 and 52 cannot be laid along the upper part of the inner surface of the valley portion 41 of the curved pipe 5. Therefore, in this case, the valleys 41 of the curved pipes of the branch pipes 34, 35
For example, the fixing member B as shown in FIG.
Place along the top of the inner surface of the.

FIG. 12 shows a method of arranging the fixing member B on the upper side of the inner surface of the trough 41 of the curved pipe formed in the branch pipe 34. In this case, the optical fiber cable 51 is passed through the slide portion 72 of the fixing member B outside the branch tube 38,
The expansion bag 21 attached to the working device 1 is inserted into the cylindrical fixing portion 73 of the fixing member B. The diameter of the columnar fixing portion 73 is previously reduced by a string or the like so that both ends can be inserted into the tube. Next, the expansion bag 21 is inflated to hold the fixing material. Thereafter, the user pushes the TV from the branch tube box 38 side to the curved tube portion in the branch tube 34 while watching the image from the TV camera 3. Next, the hollow shaft 5 is rotated so that the fixing member B
Is made to face the trough 41 of the curved pipe. Thereafter, the expansion bag 21 is further expanded to cut the cord, and the diameter of the columnar fixing portion 73 of the fixing member B is released, and the column is fixed to the inside of the branch pipe 34. Similarly, an optical fiber cable is laid in other branch pipes 35 and the like.

FIG. 15 shows an expansion bag 21 as a work jig.
And an embodiment using the holding member 24 for holding the columnar fixing portion 73 of the fixing member B. The holding member 24 adjusts the distance between the pair of plate-like members 25 with a fastening member 26 such as a bolt, and clamps both ends of the columnar fixing portion 73 of the fixing member B, thereby forming the columnar fixing portion 73. The diameter has been reduced. FIG.
As shown in (b), the holding of the fixing member B is performed by the holding member 25.
The working device 1 is moved within the branch pipe 34 while the expansion bag 21 is contracted and deflated. The work device 1 is pushed into the vicinity of the curved pipe while confirming the position of the working device 1 through the fixing member B by the TV camera 3. The following operation is the same, and the rotation of the hollow shaft 5 causes the sliding portion 72 of the fixing member B to face the valley of the curved pipe.
1 to expand the columnar fixing portion 73 so that the plate-like member 2
The diameter of the columnar fixing portion 73 sandwiched between the five is released, and the columnar fixing portion 73 is fixed to the inside of the branch pipe 34.

If the protection pipe 75 or the trunk tension member 55 becomes slack in the main pipe 31, a slack preventing member 80 shown in FIG. 13 is arranged in the main pipe 31 as shown in FIG.
The method of moving or fixing the anti-slack member 80 is determined by the fixing member B
As in the case of the guide member A, the fixing member is fixed by the columnar fixing portion 81.

The guide member A, the fixing member B, and the anti-slack member 80 may be made of the same resin as the pipe, such as hard vinyl chloride or high-density polyethylene, or metal. In particular, for a material of a type in which the cylindrical portion of these members is reduced in diameter, and is expanded and pressed against the inner wall of the tube, in order to impart resilience to the cylindrical portion, at least soft vinyl chloride or It is preferable to use polyethylene having a medium density or less or a spring steel material alone or in combination.

Further, at the end of the cylindrical portion of each member,
By forming a tapered surface that tapers toward the outer surface, it is possible to prevent a falling object from being caught and from being moved by high-pressure washing at the time of pipe line diagnosis.

[0060]

The present invention is configured as described above.
ADVANTAGE OF THE INVENTION According to the working device of this invention, installation of a repair material which is a basic operation in an underground pipe, hooking work in a pipe, etc. can be confirmed with a TV camera. In addition, the operator can turn and expand the work jig attached to the tip of the casing by operating the operator from the ground while checking the inside of the pipe with a TV camera. Since other equipment is not required, the skill of the worker is not required, and the laying work can be performed by one worker. For this reason, work efficiency can be improved. Furthermore, by using the working device of the present invention to lay a communication cable at the upper part in a branch pipe mouth or a branch pipe in an underground pipe, a member that assists in a correct position is surely provided in the pipe. It can be arranged at a desired position. Further, by attaching a plurality of jigs to the work jig, it is possible to greatly improve workability.

[Brief description of the drawings]

FIG. 1 is a view showing an in-pipe working device for laying a communication cable in an underground conduit according to the present invention, wherein (a) is a front view of a front side, and (b) is a II ′ line in (a). FIG. 3C is a cross-sectional view taken along line AA ′ in FIG.

FIG. 2 is a sectional view taken along the line II-II ′ in FIG. 1 (c).

FIG. 3 is a sectional view taken along line III-III ′ in FIG.

FIG. 4 is an overall schematic diagram showing an optical fiber cable laying structure according to the present invention.

FIG. 5 is a diagram illustrating an example of a protection tube and an optical fiber cable inserted into the protection tube.

FIG. 6 is a sectional view showing an example of a form of a protection tube.

FIG. 7 is a view showing a state in which a tension member is partially locked to the optical fiber cable.

FIG. 8 is a perspective view of a guide member for guiding the optical fiber cable so that the optical fiber cable can be laid on the upper side in the branch pipe.

FIG. 9 is a perspective view showing another example of a guide member for guiding the optical fiber cable so that the optical fiber cable can be laid on the upper side in the branch pipe.

FIG. 10 is a diagram for explaining a method of laying a communication cable in a branch pipe.

FIG. 11 is a diagram for explaining a method of laying a communication cable in a branch pipe.

FIG. 12 is a diagram for explaining a method of laying a communication cable in a branch pipe.

FIG. 13 is a diagram illustrating an example of a sag preventing member.

FIG. 14 is a view showing a fixing member for fixing the optical fiber cable so that the optical fiber cable can be laid on the upper portion of the inner surface of the valley portion of the curved pipe.

15A and 15B are diagrams for explaining a method of laying a communication cable in a branch pipe, where FIG. 15A is a side view and FIG. 15B is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 In-pipe working device for laying communication cable 2 Casing 3 TV camera 4a, 4b light 5 Hollow shaft 6 First gear 7 Front part 8 Fluid passage 9 Communication hole 10 Second gear 11 Third gear 12 Clutch shaft 13 Clutch 14 Fluid supply means DESCRIPTION OF SYMBOLS 15 Rear surface part 16 Motor 17 Fourth gear 18 Rod 19 Ball joint 20 Hook jig 21 Expansion bag 22 Leg 23 Tube 24 Holding member 25 Plate member 26 Tightening member

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 1/06 309 F16L 55/00 B 9/00 G02B 6/00 351 (71) Applicant 392008884 Ashimori Engineering (72) Inventor Ichiro Seto 696-40 Shiwatari, Yotsukaido-shi, Chiba Prefecture ) Inventor Isagiro Yagi 4--11-10, Nishi-Namba-cho, Amagasaki-shi, Hyogo (72) Inventor Koji 2-3-1, Matsuyama-cho, Yao-shi, Osaka F-term (reference) 2D063 BA11 BA20 BA32 2H038 CA69 5G369 AA16 BA04 CB01 EA01 EA03

Claims (8)

[Claims] 1. An in-pipe working apparatus for laying a communication cable in an underground pipeline used when laying a communication cable in an underground pipeline in which at least one or more branch pipes branch from the main pipe. A casing insertable into the branch pipe, a hollow shaft rotatable in a circumferential direction of the casing,
A working jig detachably provided at the tip of the hollow shaft,
And a TV camera provided on a front surface of the casing. An in-pipe working device for laying a communication cable in an underground pipe. 2. The working device for laying a communication cable in an underground pipeline according to claim 1, wherein the casing is connected to a rod so as to be tiltable at a rear surface portion. 3. A leg member capable of adjusting a height in the branch pipe is provided on an outer peripheral surface of the casing.
3. The in-pipe working device for laying a communication cable in an underground pipe according to 1 or 2. 4. The work jig is a hook-shaped jig.
2. The in-pipe working device for laying a communication cable in an underground conduit according to 1. 5. The ground according to claim 1, wherein the working jig is an expansion bag, and the casing is connected to the hollow shaft and a fluid supply means for supplying a fluid to be injected into the expansion bag is provided. In-pipe work equipment for laying communication cables in the middle pipeline. 6. A method of laying a communication cable in an underground conduit in which at least one branch pipe is branched from a main pipe, comprising: a casing insertable into the branch pipe; A communication cable laying pipe working device comprising: a hollow shaft rotatable in a direction, a work jig detachably provided at a tip of the hollow shaft, and a TV camera provided on a front surface of the casing. A hook-shaped jig is attached as the work jig, and the hook-shaped jig is rotated by rotating the hollow shaft while viewing the image from the TV camera. The communication cable located at the pipe opening was hooked, and the communication cable was pulled up to the end of the branch pipe. Thereafter, the hook-shaped jig was replaced with an expansion bag, and the expansion bag was deflated. Communication cable A guide member for inserting the internal working device for laying a pipe into the branch pipe and arranging the communication cable along the upper part of the branch pipe is supplied with fluid from the hollow shaft to the expansion bag, and is inflated and held. And the T
The expansion bag holding the guide member is rotated by rotating the hollow shaft while viewing the image from the V camera, and the guide member is positioned in the branch pipe, and the communication cable is positioned in the upper part of the branch pipe. A method of laying a communication cable in an underground conduit, characterized by being laid on the side. 7. A method of laying a communication cable inserted into a branch pipe branching from an underground pipeline main pipe or a nominal line for replacing a communication cable at an upper part of the branch pipe,
A cylindrical fixed portion having an outer diameter substantially corresponding to the inner diameter of the branch pipe near the end of the branch pipe, and having a cross section of at least a semicircle or more, and a communication cable or a nominal line laid in the branch pipe provided in the fixed portion. A sliding part for holding a slidably holding part, a communication cable or a nominal line is inserted into the sliding part, and the cylindrical fixing part is reduced in diameter, and a casing insertable into the branch pipe; and A hollow shaft that is rotatable in the circumferential direction of the casing, and a tip of which is located at the front of the casing, a working jig that is detachably attached to the tip of the hollow shaft, and a TV camera that is provided at the front of the casing. Using an in-pipe working device for laying communication cables comprising: attaching an expansion bag as the working jig, and externally mounting the fixed member in a reduced diameter state to an inflated expansion bag; Then, the in-pipe working device for laying the communication cable is moved into the branch pipe, and the expansion bag is rotated by rotating the hollow shaft while watching the image from the TV camera, so that the fixing member is moved to the upper part in the branch pipe. Side, and after that, further expanding the expansion bag to release the diameter reduction of the fixing member, disposing the fixing member in the branch pipe, and laying the communication cable on the upper side in the branch pipe. Characteristic method of laying communication cables in underground pipelines. 8. A method of laying a communication cable inserted into a branch pipe branching from an underground conduit main pipe or a nominal line for replacing a communication cable in an upper part of the branch pipe,
A cylindrical fixed portion having an outer diameter substantially corresponding to the inner diameter of the branch pipe near the end of the branch pipe, and having a cross section of at least a semicircle or more, and a communication cable or a nominal line laid in the branch pipe provided in the fixed portion. A communication cable or a nominal line is inserted through a slide portion of a fixed member having a slide portion that slidably holds the casing, and a casing insertable into the branch pipe and a casing rotatable in a circumferential direction of the casing. , A communication cable laying pipe comprising: a hollow shaft having a tip located on the front surface of the casing; a working jig detachably provided on the tip of the hollow shaft; and a TV camera provided on the front surface of the casing. Using a working device, a holding member for holding an expansion bag and a columnar fixing portion of the fixing member as the working jig is attached, and the columnar fixing portion is fixed by the holding member. While holding in the diameter state, the expanded bag in the deflated state is positioned inside the columnar fixing portion, and then the communication cable laying pipe working device is moved into the branch pipe, and while watching the image by the TV camera, By rotating the expansion bag by rotating the hollow shaft,
Position the fixing member on the upper side in the branch pipe, and then expand the expansion bag to release the cylindrical fixing part of the fixing member from the holding member to release the reduced diameter state, and dispose the fixing member in the branch pipe. And laying the communication cable on the upper side in the branch pipe.