JP4726535B2 - Method for inserting a flexible cylindrical body into a conduit - Google Patents

Description

  The present invention relates to a method for inserting a flexible flexible cylindrical body into a pipe line, and in particular, when applying a lining for repair or reinforcement of a pipe line, the lining material is fluidized in the pipe line. The present invention relates to an improvement in a method of inserting while reversing with pressure.

  In order to repair or reinforce the pipeline, a lining material is affixed to the inner surface of the pipeline, and the lining material is inserted into the pipeline for fluid lining. The method of inserting while turning over is widely known and practiced.

  In this method of turning the lining upside down with fluid pressure, the motive force for reversing the lining material depends on the fluid pressure, so the reversal may be difficult to proceed depending on the length of the pipe and the bending state, and the lining material cannot be properly lined. There are many.

  Therefore, as a means for solving this problem, Japanese Patent Application Laid-Open No. 56-20885 discloses that a long string-like object is inserted into the lining material and the long string-like object protruding from the inverted portion of the lining material is pulled. Describes a method of pulling an uninverted lining material and supplying it to the reversal part to advance the reversal of the lining material.

  In addition, this method is often used in a pipeline system including many bent portions such as gas conduits, but in such a pipeline system, burrs often protrude from the inner surface of the bent portion, Since the string-like long object may be damaged or cut by the burr, it is difficult to be damaged by the burr and reduces the frictional resistance with the inner surface of the pipe line. For example, a metal long strip is used, and the long strip is pulled through a tow rope inserted through a pipe line.

  The process of lining a pipe line by the method of the present invention will be described in detail with reference to FIG. 1. A flexible lining material 1 is wound in a coil shape and accommodated in a pressure vessel 2, and the end of the lining material 1 is pressurized. The container 2 is fixed to the tip of the discharge port 3 in an annular shape.

  A long strip 4 is inserted through the entire length of the lining material 1, and the long strip 4 is pulled from the front through the conduit 6 through a pulling cord 5 such as a rope. . Reference numeral 7 denotes a connection portion between the belt-like long object 4 and the tow rope 5.

  When a pressure fluid such as water or compressed air is fed from the fluid pressure inlet 8 provided in the pressure vessel 2, an inversion portion 9 is formed in the annular fixing portion of the lining material 1 by the pressure of the fluid, and the discharge port 3 It protrudes, and the said strip | belt-shaped elongate object 4 protrudes from the inversion part 9. As shown in FIG.

  Therefore, when the lining material 1 is pulled through the tow rope 5 while feeding the pressure fluid from the fluid pressure inlet 8, the lining material 1 is reversed so that the inner side becomes the outer side in the inverting portion 9, while the inverting portion 9 is in the tube. The lining material 1 that travels in the path 6 and is inverted at the inverting portion 9 swells due to fluid pressure, is pressed against the inner surface of the pipe line 6, and is inverted over the entire length of the lining material 1, whereby Then, the lining material 1 is used for lining.

  However, when the belt-like long object 4 as described above is used, the liner material 1 reversed by the internal pressure is twisted along with the reversal of the liner material 1, and the twist also twists the belt-like long object 4. Twist is accumulated in the scale 4, and the twisted strip-shaped long article 4 is caught by the bent part of the pipe line, so that the reversal does not proceed smoothly.

  The lining material 1 is a soft and flexible tubular body. The lining material 1 is a cylinder formed by continuously weaving a weft thread into a plurality of warp threads arranged in an annular shape by an annular loom or the like. The woven fabric is mainly used, and an airtight coating is formed on the surface thereof.

  Such a lining material has a high pressure resistance and can be applied with a high pressure for reversal, and therefore is suitable for use on a pipe line including many bent portions. However, on the other hand, when an internal pressure is applied to the lining material 1, there is a problem that twisting is inevitably caused as the tubular woven fabric is stretched.

  2 (a) and 3 show a state in which a tubular woven fabric 10 which is the main body of the lining material 1 is woven by an annular loom, and a large number of warp yarns 11 arranged radially are outward. The warp yarn 11 is opened by a ring 12 arranged in an annular shape, the shuttle 13 rotates in the void created by the opening, and the weft yarn 14 fed out from the shuttle 13 is supplied to the weaving port 15, The tubular woven fabric 10 is woven by the warp thread 11 and the weft thread 14 at the weaving port 15.

  Thus, in the above-mentioned circular loom, the shuttle 13 for weaving the weft yarn 14 usually rotates clockwise as indicated by the arrow A, and the woven tubular woven fabric 10 is taken down as indicated by the arrow B. Therefore, the weft thread 14 in the tubular woven fabric 10 is woven so as to form a counterclockwise spiral as indicated by an arrow C from the front toward the front.

  Therefore, after the lining material 1 using the tubular woven fabric 10 is reversed, the spiral turns counterclockwise as shown by an arrow D in FIG. 2B, and applies an internal pressure to the lining material 1. When this occurs, the spiral rotates in the direction in which the spiral is unfolded, that is, as indicated by the arrow E, and a twist is generated so that the tip is counterclockwise.

  Therefore, in the method of inserting the lining material 1 through the pipe 6 while inverting the lining material 1 with fluid pressure as described above, the inverted lining material 1 is twisted counterclockwise due to the inner pressure. As indicated by the arrow F, the reversing part 9 advances in the pipeline 6 while rotating counterclockwise.

  On the other hand, ropes or wires are used as the tow rope 5 for towing the strip-like long object 4, but usually commercially available ropes and wires are twisted in Z-twist, and when this is pulled, FIG. As indicated by an arrow G, the twist is returned so that the tip is turned counterclockwise.

  Therefore, the belt-like long object 4 interposed between the lining material 1 and the towing line 5 is twisted in opposite directions from both the lining material 1 and the towing line 5 while the reversal is in progress. In an extreme case, the belt-like long object 4 breaks due to the excessively accumulated twist, which makes it difficult to reverse.

It is also conceivable to prevent excessive twisting from accumulating in the belt-like long object 4 by providing a twisting-back mechanism such as a swivel between the belt-like long object 4 and the tow rope 5. It is difficult to exert its function in a state where a large tension is applied due to its mechanism, and the twist of the strip-like long object 4 cannot be sufficiently eliminated. In addition, since a considerable thickness and length are required for the twisting-back mechanism itself, it is easy to be caught when passing through the bent portion of the pipe line 6 or the like, and on the contrary, it becomes a cause of hindering the progress of reversal.
Japanese Patent Application Laid-Open No. 56-20885

  The present invention has been made in view of such circumstances, and even in a pipe line including a large number of bent portions, excessive twisting is accumulated in a strip-shaped long object made of a hard material such as metal as the reversal progresses. It is an object of the present invention to provide a method for preventing and allowing a flexible tubular body such as the lining material 1 to be smoothly inserted into a pipeline.

Thus to the present invention, the plurality of composed woven continuously helically weft to warp flexible flexible tubular body, inserting the band long product over the entire length, the flexible While reversing the tubular body with the fluid pressure so that the inside becomes the outside, the reversal is advanced in the pipeline by pulling the strip-like long object protruding from the reversing portion through the towing line. In the method of inserting the flexible tubular body into the conduit, the tow rope is a string-like object twisted in a spiral direction that matches the spiral direction of the weft thread of the flexible tubular body before the reversal. It is characterized by being.

  According to the present invention, even in a pipe line that includes a large number of bent portions, excessive twisting does not accumulate in the strip-shaped long object as the reversal progresses, and the flexible cylindrical body smoothly reverses. And can be quickly inserted into the pipeline.

  When the flexible cylindrical body 1 according to the present invention is lined on the pipe 6, the flexible cylindrical body 1 is used as a lining material as it is, and without being bonded to the inner surface of the pipe 6, various purposes can be achieved. Thus, the flexible tubular body 1 can be inserted into the duct 6.

  Further, the structure and material of the flexible cylindrical body 1 are arbitrary depending on the purpose of insertion through the pipe 6. When the flexible cylindrical body 1 is bonded to the inner surface of the pipe 6 as a lining material, an adhesive is applied to the inner surface of the flexible cylindrical body 1, and after being reversed, the adhesive moves to the outer surface. Thus, the lining material can be bonded to the inner surface of the pipe 6.

  The belt-like long object 4 inserted into the flexible tubular body 1 is usually a steel belt having toughness, although depending on the properties of the flexible tubular body 1 and the size of the diameter. A material having a width of about 5 to 30 mm and a thickness of about 0.2 to 1 mm is suitable. When there are few burrs on the inner surface of the bent portion, a hard resin such as PET can be used.

  If the width of the strip-shaped long object 4 is excessively small, the friction between the inner surface of the flexible tubular body 1 before reversal and the strip-shaped long object 4 becomes insufficient, and the traction force applied to the strip-shaped long object 4 is flexible. There is a possibility that it will not be transmitted to the tube 1.

  Moreover, when the thickness of the strip | belt-shaped elongate object 4 is too small, there exists a possibility that the flexible cylindrical body 1 may be damaged by the edge. On the other hand, if the strip-like long object 4 is excessively wide or thick, the rigidity is too high and the progress in the pipe 6 is hindered.

  Moreover, as the tow rope 5 in the present invention, a twisted string is used, and a rope or a wire is preferable. The belt-like long object 4 inserted into the flexible tubular body 1 requires a contact area with the flexible tubular body 1 and is therefore a flat belt-like object. In order to reduce the frictional resistance with the inner surface of the pipe 6, a rope or wire having a small contact area and a circular cross section is preferable.

  Thus, in the present invention, the rope or wire that is the tow rope 5 is used that is twisted in the spiral direction corresponding to the spiral direction of the weft 14 of the flexible tubular body 1 before inversion. .

  That is, in the case of the lining material mentioned in the above example, the weft 14 forms a counterclockwise spiral as indicated by an arrow C in FIG. Therefore, the tow rope 5 uses an S twisted rope or wire twisted so as to have the same counterclockwise spiral.

  In this way, when the flexible cylindrical body 1 that is the lining material is inverted, as shown in FIG. 5, the inverted flexible cylindrical body 1 is subjected to the internal pressure and the arrow as described above. As indicated by F, twisting occurs in the direction in which the tip is counterclockwise. On the other hand, the tow rope 5 is twisted in such a direction that the S twist can be unwound when the tension is applied, that is, as shown by the arrow H, the tip is clockwise.

  Therefore, the flexible tubular body 1 and the tow rope 5 rotate the strip-shaped long object 4 in the same direction from both ends thereof, and no twist is accumulated in the strip-shaped long object 4. Even if the twist from the flexible tubular body 1 acts on the belt-like long object 4 and the twist is sometimes accumulated in a part of the pipe 6, the tow rope 5 from the further side. As a result, twisting in the opposite direction acts, so that even if twisting temporarily accumulates, it is quickly eliminated.

  Also, even if the elongated strip is twisted as the flexible tubular body is twisted, and the twist reaches the tow rope, the twist direction is the direction to untwist the tow rope. It can be twisted without mechanical resistance, and the twist of the strip-shaped long object can be easily eliminated.

  In order to confirm the effect of the present invention, piping as shown in FIGS. 6 and 7 was formed. The pipe 16 uses a steel gas conduit (named 50A) with a diameter of 52.9 mm, and four 90 ° elbows 17 are used in the middle to connect three 1 m pipes 16 to each other, as shown in FIG. 18 was formed, and a conduit system having a total length of about 52 m was formed. Then, a through hole having a diameter of 1 to 2 cm was formed in a required portion of the pipeline system so that the inside situation could be observed. Reference numerals 17a to 17d denote four elbows in order from the starting end 19 to the reaching end 20 of the pipe.

  The flexible tubular body is made by weaving a weft thread into a plurality of warp yarns arranged in an annular shape in a counterclockwise direction toward the tip, and weaving a long tubular woven fabric with a diameter of 50 mm on the outer surface. An airtight coating was formed.

  As the belt-like long article, a steel belt made of bainitic steel having a width of 10 mm and a thickness of 0.4 mm was prepared, and inserted through the entire length of the flexible cylindrical body. As the tow rope, 3 mmφ S-twisted and Z-twisted wires were prepared and inserted into the pipe.

  A pressure vessel is installed at the starting end of the pipe to accommodate a flexible cylindrical body wound in a coil shape, and the end of the flexible cylindrical body is annularly fixed to the discharge port of the pressure vessel. The tip of the strip-shaped long object protruding from the cable was connected to the tow rope.

  While feeding the pressure fluid into the pressure vessel and applying a pressure of 0.15 MPa, the reversing of the flexible tubular body is advanced by pulling the tow rope from the end of the piping, and the flexible tubular body We observed the progress of reversal and the change of the force applied to the towline.

  As the inversion portion of the flexible cylindrical body advances in the pipe, the length of the non-inverted flexible cylindrical body that slides through the already-inverted flexible cylinder gradually increases. Therefore, although the load applied to the tow rope gradually increases, the load is about 35 kg at the maximum until the reversal portion reaches the elbow 17a.

  In the meantime, the flexible cylindrical body is twisted while being inverted, and the twist also twists the strip-shaped long object. However, when the tow rope is S-twisted, the twist is locally applied to the strip-shaped long object. The torsion did not accumulate, and the torsion did not catch on the elbows 17a to 17d, and the reversal proceeded almost smoothly. On the other hand, when the tow rope is Z-twisted, it was in a state where the reversal progressed while the twist was accumulated in the long strip in front of the elbow 17a. There was no.

  When the reversing part of the flexible tubular body reached the bent part 12, resistance occurred when the reversing part changed the reversal direction in the elbow 17, and the load applied to the tow rope was significantly increased. When the tow rope was S-twisted, the loads when passing through the four elbows 17a, 17b, 17c, and 17d were 600N, 700N, 500N, and 250N, respectively.

  On the other hand, when the tow rope is a Z-twisted wire, the load when passing through the elbow 17a was not much different from 500N, but when the reversing part reached the second elbow 17b, a long strip The torsion was caught on one of the elbows 17 and could not pass even if the load of the tow rope was increased to 850N.

  Therefore, once the non-inverted flexible cylindrical body was slightly rewound into the pressure vessel, the flexible cylindrical body was reversed in reverse, the reversing part was pulled back to the elbow 17a, and then the reversal was advanced again. It seems that the twist of the strip-shaped long object was eliminated to some extent during reverse reversal, and the elbow 17b was able to pass through with a load of 600N. The loads passing through the elbows 17c and 17d were 500N and 250N, respectively.

  After the reversal part reaches the reaching end and the insertion of the flexible cylindrical body into the pipe is completed, the state of the strip-like long object pulled out from the reaching end is observed. In the belt-like long object, 5.5 twists were generated in the Z-twist direction, and quite severe trauma occurred, which could break.

  On the other hand, when the tow rope was S-twisted, the belt-like long object was twisted 4.5 times in the S-twist direction, but almost no injury was observed. The twist caused by the reversal of the flexible cylindrical body was caused to twist in the S-twist direction in the band-like long object despite the fact that the band-like long object acts to twist in the Z-twist direction. It is considered that the effect of unwinding the tow rope rather than the flexible tubular body was somewhat greater on the strip-like long object extending forward from the reversing part.

Central longitudinal cross-sectional view showing a state where the flexible cylindrical body is inserted into the pipe line while being inverted by the fluid pressure The perspective view which shows the state which weaves a cylindrical woven fabric with a ring loom Central longitudinal cross-sectional view showing a state in which a tubular woven fabric is woven by an annular loom The perspective view which shows the state of the twist of the lining material and tow rope in a prior art example The perspective view which shows the state of the twist of the lining material and tow rope in this invention Conceptual diagram of piping formed for the test of effect confirmation of the present invention Enlarged central longitudinal sectional view of the bent portion in the piping of FIG.

Explanation of symbols

1 Flexible tubular body (lining material)
4 Belt-like long object 5 Towing rope 6 Pipe line 14 Weft

Claims (1)

Inserting a plurality of warp yarns (11) comprising woven weft (14) in continuous spiral to soft flexible tubular body (1), strip long product over the entire length (4) Then, while reversing the flexible cylindrical body (1) with the fluid pressure so that the inside becomes the outside, the strip-like long object (4) protruding from the reversing part is passed through the tow rope (5). In the method of inserting the flexible tubular body (1) into the conduit (6) by advancing the reversal in the conduit (6) by pulling, the retractor (5) A flexible cylindrical body is placed in a duct, which is a string-like object twisted in a spiral direction corresponding to the spiral direction of the weft thread (14) of the previous flexible cylindrical body (1). How to insert

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