JPH0444529Y2 - - Google Patents

Description

[Detailed explanation of the idea]

INDUSTRIAL APPLICATION FIELD The present invention relates to a conduit insertion tool for passing a fiberscope, etc., into, for example, underground city gas pipes. BACKGROUND ART FIG. 10 is a front view of a typical prior art conduit insertion tool 1. With reference to FIG. 10, the configuration of a conventional conduit insertion tool 1 will be described. The conduit insertion tool 1 has an elongated body 3 including a plurality of portions having different radii, which are made by tightly winding a wire 2 having spring elasticity into a coil shape. A guide ball 4 is fixed to the tip of the elongated body 3. For example, a fiberscope or the like is inserted into such a conduit insertion tool 1 and then pushed into a tube body such as an underground city gas pipe to pass the line. Problems to be Solved by the Invention In the pipe insertion device 1 of the prior art, there is a step inside the pipe body to which the wire is to be passed, or a pipe protruding inwardly in the radial direction in the pipe joint used. It gets caught in the burr 40 shown in Figure 11. In particular, when the elongated body 3 is pulled outward from the tubular body, the coiled wire 2 constituting the elongated body 3 gets caught on the burrs, etc., and the elongated body 3 is pulled out. If an attempt is made to pull it out with too much force, there are problems such as the elongated body 3 being stretched and plastically deformed, or becoming caught and unable to be pulled out. An object of the present invention is to solve the above-mentioned problems and provide a pipe insertion tool that can be easily pushed into or pulled back into a pipe to be inserted. Means for Solving the Problems The present invention includes an elongated body 13 formed by tightly winding an elastic wire 12 into a coil, and a fixed distance between the tip of the elongated body 13 and the elongated body 13. An elastic band-shaped body 17 is wound around the outer periphery of the long body 13 from the position where the body was placed in a coil shape over the remaining entire length of the long body 13 at intervals in the longitudinal direction of the long body 13.
and a net-like body 15 which covers the band-like body 17 and is formed by winding the band-like body 17 and knitting metal wires in a bias shape. Function The conduit insertion tool according to the present invention has a net-like body made of metal wires woven in a bias shape around the outer periphery of a long body made up of elastic wires wound tightly in a coil shape. Configured. Therefore, in either cases when such a pipe insertion tool is inserted into a pipe to which the wire is to be passed, or when the pipe pipe insertion tool is pulled out from inside the pipe to the outside. Even if, for example, there is a barb or burr associated with such a tube that projects radially inward within the tube, such projections only slide with said mesh. , does not obstruct the movement of the conduit insertion tool. Therefore, by using such a conduit insertion tool, operations such as pushing and pulling back become much easier. In particular, in the present invention, the net-like body 15 is wound over the remaining entire length from a position a certain distance from the tip of the elongate body 13. In other words, the net-like body 15 is wound around the elongate body 13 and its vicinity are not wound, so this elongated body 13
The bending rigidity of the elongated body 13 can be reduced, thereby making it easier for the elongated body 13 to pass through a bent pipe. Furthermore, according to the present invention, the net-like body 15 is constituted by thin metal wires extending across the longitudinal direction of the elongated body 13 and knitted in a bias shape, so that the present conduit can be inserted. Net-like body 15 which is the outer peripheral surface of the ingredient
It is possible to make contact with the inner circumferential surface of the pipe with low frictional resistance, thereby allowing the pipe insertion tool to be smoothly inserted into the pipe over a long distance. Furthermore, according to the present invention, the elastic band 17 is made of rubber or synthetic resin sponge, for example.
is interposed between the outer circumferential surface of the elongated body 13 and the inner circumferential surface of the net-like body 15, and is wound in a coil shape with an interval G1, so that the elongated body 13 is connected to the bent portion of the pipe. As a result, the pipe insertion tool can be inserted over a long distance into a pipe that has many bends. Embodiment FIG. 1 is a front view showing a partial cross section of a conduit insertion tool 11 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken from the cutting plane line - in FIG. 1. The configuration of the conduit insertion tool 11 will be described with reference to FIGS. 1 and 2. The conduit insertion tool 11 includes an elongated body 13 formed by tightly winding an elastic wire 12 into a coil shape. This elongated body 13 is configured such that its bending rigidity decreases from its base end toward its distal end (from the right to the left in FIG. 1). A spherical guide ball 14 is fixed to the tip of the elongated body 13. The elongated body 13 has a diameter of 0.2 to 0.3 mm as shown in FIG.
A thin metal wire having a flexibility of φ is wound and covered by a net-like body 15 knitted in a bias shape. As is clear from FIG. 3, this net-like body 1
The strands 5 extend across the longitudinal direction of the elongated body 13, which is the left-right direction in FIG. The tip of the net-like body 15 is, for example,
is fixed by a fixing member 16 so that it does not come undone from this tip. This fixing member 16
The outer periphery of the tube is tapered toward the distal end, and is formed in an outwardly convex arc shape so that the pipe passage insertion tool 11 can be easily passed through the pipe. Long body 13
For example, there is a thickness D1 between
A belt-like body 17 made of an elastic material such as rubber and having a width W1 of 5 to 15 mm and a width W1 of 5 to 15 mm is wound in a coil shape in the axial direction at intervals of a length G1 of 0.5 to 1 mm. Ru. The reason why the outermost periphery of the conduit insertion tool 11 of this embodiment having the above-mentioned configuration is covered with the mesh body 15 is as follows. Here, FIG. 4 will also be referred to. Assuming that the mesh body 15 is covered with a layer of synthetic resin material, the synthetic resin material is softer than the metal material, and therefore the pipe insertion tool 11 is inserted into the ground, for example, for city gas. In the pipe body 23, such as an intermediately buried pipe, the angular protrusions 30, such as curls, bite into this synthetic resin material layer and get caught. Assuming that the conduit insertion tool 11 covered with such a synthetic resin material layer is bent when it is inserted into the pipe body 23 or the like and passes through the elbow 31 or the like, the curvature of the bending of the elbow 31 is A compressive force acts on the radially inner side of the conduit insertion tool 11 in the longitudinal direction of the conduit insertion tool 11, and a tensile force acts on the radially outer side. Therefore, such a synthetic resin material layer is
Wrinkles or the like are generated on the radially inner side, and stretched on the radially outer side. These wrinkles may catch on the end of the pipe body 31 connected to the elbow 31, etc., and cause the pipe passage insertion tool 11 to
It becomes difficult to operate the wiring. Therefore, as in this embodiment, the mesh body 15 made of metal wires knitted in a bias shape as shown in FIG.
Since such a wire is made of a metal material, it will not get caught on the sharp protrusion 30 such as a curvature or burr at the end of the tube, and even when bent, the metal wire woven in a bias shape will not be caught. By sliding relative to each other, bending motion can be performed without causing wrinkles as described above. Furthermore, as shown in FIG. 1, by winding and interposing the elastic belt-like body 17 between the net-like body 15 and the elongated body 13, the conduit insertion tool 11 can be inserted into, for example, an underground pipe. When inserted into the tube body 23 such as
Although the mesh body 15 partially expands and contracts when the elbow 31 and the like pass, it is possible to prevent the mesh body 15 from becoming partially dense. In addition, such a conduit insertion tool 11 is inserted into the elbow 31.
When passing through the belt, the radially outer portion of the strip 17 is expanded in relation to the radius of curvature of the elbow 31 and is, so to speak, crushed in the thickness direction.
Therefore, the radially outer side of the net-like body 15 is allowed to be displaced radially inward, and therefore the conduit insertion tool 11 can be bent easily and gently. Such a strip 17
is interposed between the elongated body 13 and the net-like body 15, as shown in FIG. 4A, when passing through the bend of the tube, the distance G1 is As shown by the symbol G1a, the diameter of the conduit insertion tool becomes small, so that the pipe insertion tool can pass the wire even in a curved portion having a small radius of curvature. If this interval G1a becomes zero, the conduit insertion tool cannot pass through a bent portion having a smaller radius of curvature. The present invention solves these problems. The material of the band-like body 17 having such a function is as follows:
As mentioned above, the material is not limited to rubber, and a synthetic resin sponge such as urethane may also be used. FIG. 5 is a diagram illustrating the configuration of a second embodiment of the present invention, and FIG. 6 is a sectional view of a conduit insertion tool 11a used in this embodiment. This embodiment is similar to the previous embodiment, and corresponding parts are given the same reference numerals. What is noteworthy about this embodiment is that an insertion hole 18 is formed over the entire length of the conduit insertion tool 11a, and an insertion hole 19 coaxial with this insertion hole 18 is formed in the guide ball 14. That's true. The glass fiber 20 constituting the fiberscope is inserted into the insertion holes 18 and 19 from the proximal end side of the conduit insertion tool 11a, the tip thereof is made to protrude from the guide ball 14, and the base of the conduit insertion tool 11a is inserted. Observation means 2 connected to this glass fiber 20 at the end
1, an observer 22 can visually check the inside of the tube body 23 with the naked eye. After fully pushing the pipe insertion tool 11a into the pipe body 23, while pulling back the pipe insertion tool 11a, insert the pipe insertion tool 11a into the pipe body 23.
Observe the inner peripheral surface, etc. Here, pipe insertion tool 1
Since 1a has the same configuration as the above-described embodiment, the pulling back operation and the like can be performed easily and smoothly. FIG. 7 is a system diagram showing the configuration of a third embodiment of the present invention, and FIG. 8 is a front view showing a partial cross section of a conduit insertion tool 11b used in this embodiment. The configuration of this embodiment will be described with reference to FIGS. 7 and 8. This embodiment is similar to the previous embodiment, and corresponding parts are provided with the same reference numerals. Conduit insertion tool 11 used in this example
b, for example, through an insertion jig 24 provided in a pipe body 23 such as an underground pipe for city gas, etc.
It is inserted into the tube body 23. This conduit insertion tool 11b
Near the tip of the tube body 23 as shown in FIG.
A magnetic sensor 25, etc., which can detect thinning of the inner peripheral surface due to corrosion, etc., is attached. A cable 32 connected to this magnetic sensor 25 is inserted through the elongated body 13. As explained in each of the above-mentioned embodiments, the conduit insertion tools 11, 11a, 11b according to the present invention each have a structure in which the elongated body 13 is covered twice with the band-like body 17 and the mesh-like body 15. There is. Therefore, there is a possibility that the bending performance of the conduit insertion tools 11, 11a, and 11b (hereinafter generally indicated by the reference numeral 11) is decreased, and the wire passing ability is decreased. Therefore, the inventors of the present invention conducted experiments as described below, and as a result, as described above, the conduit insertion tool 11 consisting of the elongated body 13 double-covered with the band-like body 17 and the net-like body 15 was constructed. However, we were able to prove that the wiring performance did not deteriorate. Below, we will describe the details of an experiment conducted by the inventor of the present invention in which the conduit insertion tool 11 of the present invention was used for passing wires inside a pipe. FIG. 9 is a system diagram of the various piping used in this experiment. The results of the experiment are shown in Table 1 below.

[Table] In Table 1, columns (1) and (2) correspond to the cases of FIG. 9 1 and FIG. 9 2, respectively. The materials and dimensions of the various tubes used in FIG. 9 are shown in the corresponding columns of Table 1.
Further, in Table 1, ○ marks indicate that each conduit insertion tool 11 inserted from the insertion tube 26
Indicates that you have reached this point. Also, the number attached to the circle indicates how many elbows the resistance increases after reaching. In addition, the △ mark indicates a case where resistance increases in the middle of the piping system and the connection is interrupted, and the number attached to the △ mark indicates after which elbow the resistance increased or the connection became interrupted. show. Numbers 1 to 5 in Figure 9 1 and Figure 9 2
2A and 2B show the elbows from the insertion tube 26 in sequence. The horiage pipes in Table 1 are iron pipes that are buried underground and have rust inside, so they are installed using elbows as shown in Figure 9.1. It is connected. The new iron pipes in Table 1 are unused iron pipes connected with elbows as shown in Figure 9-2. In such Horikami pipes and new iron pipes, the burrs near the elbows were removed in advance, and experiments were conducted using the Horikami pipes and new iron pipes from which such burrs had been removed. Among Comparative Examples C, D, and E in Table 1, Comparative Example C has a structure in which the conduit insertion tool 1 shown in FIG. 10 is covered with the mesh body 15 described with reference to FIG. 1. has. Comparative Example D has a configuration in which the band-like body in the above-mentioned example is tightly wound as a rubber band with a thickness of 1 mm and a width of 15 mm, and Comparative Example E
The band-shaped body 7 in the above-mentioned embodiment has a thickness of 1
It has a densely wound structure made of rubber with a width of 7.5 mm. In Example F of Table 1, the strip 7 has a thickness of 1
Made of urethane sponge with a width of 10 mm and a spacing of 1 mm.
It has a structure in which it is wound into a coil shape with a hole in between. The wire passing performance of Comparative Examples C, D, E and Example F are quite similar, and the wire passing performance of Example F is unlikely to be degraded by the presence of the strip 7. It is understood that this is not the case. The inventor further conducted experiments, using the aforementioned Horikami pipe and new iron pipe with large burrs protruding into the elbows, and wired Comparative Examples C, D, E and Example F. We investigated its performance. In this experiment, the angle of the elbow of the Horikami pipe and the new iron pipe was
In the previous experiment, the angle was 90 degrees, but in this experiment, it was a much smaller angle, for example, around 45 degrees. As a result of this experiment, in Comparative Examples C, D, and E,
Although the wire passing performance was significantly degraded, in Example F, almost no deterioration in the wire passing performance was observed. As a result, even if the axis of both ends of the elbow is less than 90 degrees, according to the present invention, there is no decrease in wire passing performance, and the wire passing performance is compared to comparative examples C, D, and E. It was confirmed that it was excellent. According to the above experimental results, even with the configuration in which the elongated body 13 is covered twice with the band-like body 17 and the net-like body 15, the wire passing performance is prevented from deteriorating. Therefore, the frictional force with the inner peripheral surface of pipes such as underground pipes is reduced, and
It is possible to easily insert and pull back the wire into the tube, and to prevent the wire passing performance from deteriorating at the bent portion. Moreover, even when the elbow angle is less than 90 degrees, the present invention
No significant deterioration in wiring performance was observed. Effects As described above, in the conduit insertion tool according to the present invention, the outer circumference of the elongated body 13, which is formed by tightly winding elastic wires in a coil shape, is covered with a net made of metal wires woven in a bias shape. The body 15 is wound. Therefore, the inner circumferential surface of the tube into which this conduit insertion tool is inserted slides on the outer circumferential surface of the net-like body 15, and the inner circumferential surface of the tube into which the conduit insertion tool is inserted slides on the outer circumferential surface of the net-like body 15, and the strands of wire wound into a coil form are adjacent to each other in the axial direction. It is possible to prevent, for example, an angular protrusion on the inner circumferential surface of the tube from getting caught on the portion and interfering with the wire threading operation. Furthermore, since such a mesh body 15 is wound, it is possible to significantly reduce the degree of expansion and contraction of the conduit insertion tool in relation to the pushing force and tensile force in the axial direction of the conduit insertion tool. Wiring operations for tools can be easily performed. Further, according to the pipe insertion tool according to the present invention, the net-like body 15 is wound over the remaining entire length from a position a certain distance from the tip of the elongated body 13. The net-like body 15 is not formed at the tip of the length body 13, and the bending rigidity of the tip is small. Therefore, the bent portion of the pipe can be smoothly inserted using the pipe insertion tool. Further, according to the present invention, thin metal wires extend in the longitudinal direction of the elongated body 13 and are knitted in a bias shape, so that the net-like body 15
can be inserted and pulled out with low frictional resistance while contacting the inner peripheral surface of the tube. Furthermore, according to the present invention, the elastic band 1
7 is the interval G at the part where the mesh body 15 is wound.
1 is opened and wound around the entire elongated body 13 and interposed between the elongated body 13 and the net-like body 15, thereby preventing the mesh-like body 15 from being partially densely packed. Furthermore, it is possible to prevent the elongated body 13 from being crushed when the pipe passage insertion tool passes through a curved portion of the pipe having a relatively small radius of curvature. Further, according to the present invention, even when passing a wire through an elbow where both ends are less than 90 degrees, the wire threading operation can be performed relatively smoothly.

[Brief explanation of the drawing]

1 is a front view showing a partial cross section of a conduit insertion tool 11 according to an embodiment of the present invention, FIG. 2 is a sectional view taken from the cutting plane line - of FIG. 1, and FIG. FIG. 4 is a cross-sectional view illustrating the effects of this embodiment, and FIG. 4A is a cross-sectional view showing the state of the strip 17 when the conduit insertion tool 11 passes through the bent portion of the pipe. , FIG. 5 is a diagram illustrating the state of use of the conduit insertion tool 11a according to the second embodiment of the present invention, FIG. 6 is a simplified sectional view of the conduit insertion tool 11a, and FIG. FIG. 8 is a system diagram illustrating the usage state of the conduit insertion tool 11b of the third embodiment.
Fig. 9 is a front view showing a partial cross section of b, and Fig. 9 is a piping system diagram used in an experiment to explain the effects of the present invention.
Figure 0 is a front view of the conduit insertion device 1 of the prior art;
The figure is a cross-sectional view showing a state in which the prior art conduit insertion tool 1 is caught on a burr 40. 11, 11a, 11b... conduit insertion tool, 12...
...Elementary wire, 13... Long body, 15... Reticular body, 17
... Band-shaped body.

Claims (1)

[Claims for Utility Model Registration] An elongated body 13 formed by tightly winding an elastic wire 12 into a coil shape, and a position at a certain distance from the tip of the elongated body 13. An elastic band-shaped body 17 is wound around the outer periphery of the long body 13 over the remaining entire length in a coil shape at intervals in the longitudinal direction of the long body 13.
and a net-like body 15 that covers the band-like body 17 and is wound from the starting position of the band-like body 17 over the remaining entire length of the elongated body 13, and is made by braiding metal wires in a bias shape. A conduit insertion tool characterized by comprising: