JP3197831B2 - Guide tube fixture in buried pipe and fixing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for laying and fixing a guide pipe in an underground pipe for laying various cables for communication, electric power and the like underground.

When a communication cable is laid underground, the manhole is connected with a buried pipe such as an iron pipe.
A method of laying a cable therein is employed. In this case, when accommodating a plurality of cables in one large-diameter buried pipe, a guide pipe such as a hard vinyl pipe is laid in the buried pipe, and the cables are accommodated therein.

When such a guide tube is used, it is necessary to fix the guide tube at the end on the manhole side using a guide tube fixing device. Conventionally, a device as disclosed in Japanese Patent Application No. 7-160444 is used as a guide tube fixing device for laying a cable. This device has a cylindrical shape provided with a plurality of guide tube insertion holes corresponding to each guide tube, and is fixed such that the guide tubes are pressed at both ends.

[0004]

However, a guide tube fixing device provided with a guide tube insertion hole corresponding to each guide tube having a predetermined outer diameter from the beginning cannot cope with a change in the diameter of the guide tube. There is a problem. That is, even in the case of using a guide pipe having an outer diameter smaller than the predetermined outer diameter in the future, the total number of guide pipes that can be laid is the same as the number of the original guide pipe insertion holes, and the effective use of the space inside the buried pipe is required. I can't do it.

In the method of fixing the guide tube by pressing the guide tube at both ends, there is no problem if the guide tube has a high rigidity such as a hard vinyl pipe, but the guide tube has a low rigidity such as a soft polyethylene pipe. In this case, for example, when the cable is inserted into the guide tube, there is a problem that the guide tube moves together with the cable due to friction and is bent in the buried tube, so that the guide tube is not fixed.

[0006] In view of such circumstances, an object of the present invention is to provide:
It is an object of the present invention to provide a technique for laying a guide pipe that can effectively use a space in a buried pipe and that can be fixed even with a soft guide pipe.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a guide tube fixing tool in a buried pipe according to the present invention has a disk shape having an outer diameter smaller than the inner diameter of the buried pipe. In order to have one or more rectangular guide tube insertion holes which can be inserted, and having a flange portion having an outer diameter larger than the outer diameter of the buried tube on one surface, the flange portion fixes the guide tube fixture to the buried tube. It has a structure with bolt holes.

Further, in the guide tube fixing method according to the present invention, in the manhole, the surface opposite to the surface provided with the flange portion of the guide tube fixing device is directed toward the buried tube, and the guide tube fixing device is attached to the buried tube end. Inserting, tightening the bolts by inserting bolts into the bolt holes in the flanges and the bolt holes in the protrusions provided on the outer surface of the buried pipe end, and fixing the guide pipe fixture to the buried pipe, fixing the guide pipe to the guide pipe Laying in the buried pipe through the guide pipe insertion hole of the tool, and the guide pipe part protruding toward the manhole from the guide pipe insertion hole of the guide pipe fixing tool, The method includes a step of gripping with a guide tube gripper of a size that cannot pass.

According to the present invention, the guide tube fixture is fixed to the buried tube, the guide tube is laid in the buried tube through the guide tube insertion hole, and both ends of the guide tube fixture are provided by manholes at both ends. By holding the guide tube with a guide tube holder having a size that cannot pass through the guide tube insertion hole on the front surface of the guide tube, the guide tube can be prevented from moving back and forth, and the guide tube can be fixed.

Further, since the guide tube fixing device of the present invention has a rectangular guide tube insertion hole through which a plurality of guide tubes can be inserted, a guide tube having an outer diameter smaller than a predetermined outer diameter will be used in the future. In this case, the number of guide pipes that can be laid is larger than the number of guide pipes that can be laid conventionally, and the space in the buried pipe can be effectively used.

Further, according to the fixing method of the present invention, since the guide tube is gripped by the guide tube gripper at the front surface of the guide tube fixture at both ends of the guide tube, even a guide tube having a small rigidity such as a soft polyethylene pipe can be used. Movement can be prevented and fixed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an underground facility using a guide pipe fixing device according to the present invention. Generally manhole
The duct 11 and the buried pipe 5 are connected by a duct sleeve 12 in a movable state having earthquake resistance. In such an underground facility, the guide tube fixtures 1 are installed at both ends of the buried pipe 5, the guide tubes 6 are laid in the buried pipe 5 through the guide tube fixtures 1, and the guide tube grippers 7 are provided at both ends. Attach and fix the guide tube 6.

FIG. 2 is a view showing the guide tube fixing device 1 according to the present invention in detail. FIG. 2A is a front view as viewed from the flange portion side, and FIG. 2B is a central sectional view. The guide tube fixing device 1 according to the present invention has a flange portion 3 on one surface thereof for fixing to a buried tube 5, and further has a rectangular guide tube insertion hole 2 through which a plurality of guide tubes 6 can be inserted. Reference numeral 4 denotes a bolt hole for fixing the buried pipe 5 and the guide pipe fixture 1.

FIG. 3 is a sectional view showing a state in which the guide tube 6 is fixed to the buried tube 5 using the guide tube fixture 1 according to the present invention. The guide pipe fixing device 1 is attached to the buried pipe 5 connected to the manhole 11 by the duct sleeve 12, and the bolt hole 4
The buried pipe 5 is fastened and fixed to the projection 13 provided on the outer surface of the end portion of the buried pipe 5 by a fastening bolt 9 passed through the hole. This operation is performed at both ends of the buried pipe 5.

In the above state, the guide tube 6 for laying the cable is inserted into the guide tube insertion hole 2 of the guide tube fixture 1 in the manhole 11 at one end and the guide tube insertion hole 2 of the guide tube fixture 1 at the other end. Lay through 2. At this time, the guide tube 6 is cut at a position of about 10 cm from the front surface of the guide tube fixture 1, and a guide tube grip 7 having a shape that cannot pass through the guide tube insertion hole 2 is firmly attached to both ends of the guide tube 6. Even if the guide tube is small in rigidity, the guide tube end can be laid so as not to move into the buried tube, and the cable 8 can be easily inserted into the guide tube 6. As described above, the guide tube holding member 7 can be any device that has a size that cannot pass through the guide tube insertion hole and that firmly holds the guide tube. For example, a metal fitting having the same shape as a metal fitting for fastening a commercially available pipe or hose can be used. In FIG. 3, reference numeral 10 denotes a packing for stopping water.

FIG. 4 shows a state in which the guide tube 6 and the cable 8 are laid using the guide tube fixture 1 according to the present invention (FIG. A).
FIG. 4 is a cross-sectional view showing a state in which a cable 17 and a cable 17 are laid (FIG. The guide tube fixing device 1 according to the present invention has a rectangular guide tube insertion hole 2, whereas the conventional guide tube fixing mount 14 has a circular guide tube insertion hole 15. FIG.
First, a large-diameter cable 17 and a corresponding large-diameter guide tube 16 are laid by a conventional method (FIG. B), and then a small-diameter cable 8 and a corresponding small-diameter guide are provided by the method of the present invention. The state in which the pipe 6 is laid again (FIG. A) is shown.

In FIG. 4b, since the guide tube insertion hole 15 is circular, the number of guide tubes 16 laid is not different from the number of guide tube insertion holes 15 even if the guide tube 16 has a small diameter.
In the case of the rectangular guide tube insertion hole 2 like the guide tube fixing device 1 according to the present invention shown in FIG. 4A, more guide tubes 6 having a smaller diameter can be laid than in FIG.

[0018]

As described above, according to the guide pipe fixing method of the present invention, the guide pipe fixing tool of the present invention is fixed to the buried pipe, the guide pipe is laid through the guide pipe insertion hole, and the guide pipe is laid at both ends. The guide tube can be easily fixed only by attaching a guide tube gripper having a shape that does not pass through the guide tube insertion hole to the guide tube in front of the guide tube fixing device. Furthermore, since the guide tube insertion hole of the guide tube fixing device of the present invention is a rectangle through which a plurality of guide tubes can be inserted, a guide tube that can be laid when a guide tube having an outer diameter smaller than a predetermined outer diameter is used in the future. The number of pipes is larger than the number of pipes when a guide pipe having a predetermined outer diameter is initially used, so that the space inside the buried pipe can be effectively used. Further, the method of the present invention is a method of fixing the guide tube by gripping the guide tube with a guide tube gripper having a shape that does not pass through the guide tube insertion hole at the front surface of the guide tube fixture at both ends, so that the soft polyethylene Even a guide tube having a small rigidity such as a pipe can be easily fixed.

[Brief description of the drawings]

FIG. 1 is a sectional view of an underground facility using a guide tube fixture according to the present invention.

FIG. 2 shows a guide tube fixture according to the invention in detail.

FIG. 3 is a view showing a state in which a guide tube is fixed to a buried tube using the guide tube fixing device according to the present invention.

FIG. 4 shows a state where a guide tube and a cable are laid using the guide tube fixing device according to the present invention (FIG. A) and a state where the guide tube and the cable are laid using a conventional guide tube fixing attachment (FIG. B). It is a figure shown in comparison.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide pipe fixture 2 Guide pipe insertion hole 3 Flange part 4 Bolt hole 5 Buried pipe 6 Guide pipe 7 Guide pipe gripper 8 Cable 9 Tightening bolt 10 Waterproof packing 11 Manhole 12 Duct sleeve 13 Projection 14 Guide pipe fixed mounting 15 Guide tube insertion hole 16 Guide tube 17 Cable

Claims (2)

(57) [Claims] A guide tube for receiving a guide tube in a buried tube laid underground and having an end fixed to an opening in a wall surface of a manhole, and fixing an end of the guide tube to the buried tube. The fixture has a disc shape having an outer diameter smaller than the inner diameter of the buried pipe, has one or more rectangular guide pipe insertion holes through which a plurality of guide pipes can be inserted, and has an outer diameter of the buried pipe on one surface. A guide tube fixture in a buried pipe, comprising a flange portion having a larger outer diameter, the flange section comprising a bolt hole for securing the guide tube fixture to the buried pipe. 2. A method of fixing a guide tube in a buried pipe using the guide tube fixing device according to claim 1, wherein a surface of the guide tube fixing device on a side opposite to a surface provided with a flange portion is fixed. Inserting the guide tube fixture into the end of the buried pipe toward the buried pipe; inserting a bolt into the bolt hole of the flange and the bolt hole of the protrusion provided on the outer surface of the buried pipe end to tighten the guide; Fixing the pipe fixing tool to the buried pipe, laying the guide pipe in the buried pipe through the guide pipe insertion hole of the guide pipe fixing tool, and protruding toward the manhole from the guide pipe insertion hole of the guide pipe fixing tool. A method of fixing a guide pipe in a buried pipe, comprising a step of gripping a portion of the guide pipe with a guide pipe gripper having a size that cannot pass through the guide pipe insertion hole in front of the guide pipe fixing tool.