JP2007232123A - Pulling tool and insertion method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulling tool to be used for inserting a corrugated pipe into an existing duct having a bent portion, and to provide an insertion method using the same. <P>SOLUTION: The pulling tool 10 comprises a first engaging member 12 mounted at the front end of an insertion pipe 14, and a second engaging member 18 arranged at the corner thereof. A pulling line 46 mounted on the first engaging member 12 is pulled to insert the insertion pipe 14 into the existing duct 16. The second engaging member 18 engageable with the insertion pipe 14 is mounted with a drawing line 20. After the second engaging member 18 engages therewith, the drawing line 20 is pulled to draw the second engaging member 18 toward the first engaging member 12 and contract the insertion pipe 14 between the first engaging member 12 and the second engaging member 18, thus preventing the whitening and breakage is the insertion pipe 14 due to elongation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a traction jig and an insertion method using the same, and particularly, for example, a traction jig used for inserting a corrugated pipe into an existing pipe line having a curved portion, and an insertion method using the same. About.

An example of a conventional insertion method is disclosed in Patent Document 1. In Patent Document 1, after attaching a retaining member to the end of a corrugated pipe, the lead wire is pulled and the corrugated pipe is inserted into an existing pipe line.
JP-A-7-71651 [F16L 1/00, H02G 3/04]

  In the prior art of Patent Document 1, when a corrugated tube is inserted into an existing pipeline having many curved portions, friction occurs between the corrugated tube and the inner surface of the curved portion when the corrugated tube passes through the curved portion. Therefore, as the number of passing through the curved portion increases, the movement resistance of the corrugated tube increases. If the end of the corrugated tube is pulled in such a situation, the movement of the corrugated tube cannot follow this pulling force, and the tip of the corrugated tube is stretched, plastically deformed and whitened or broken. There is a fear.

  Therefore, a main object of the present invention is to provide a traction jig and an insertion method using the traction jig that can prevent the insertion tube from being whitened or broken.

  The first aspect of the present invention is a traction jig for inserting an insertion tube that can be expanded and contracted in the axial direction into an existing conduit, and includes a first engagement member that engages with a tip of the insertion tube, and a first engagement member. A traction line for pulling the combined member in the axial direction from the outside of the insertion tube, a second member disposed behind the first engagement member in the insertion tube and capable of engaging and disengaging from the inner surface of the insertion tube An engaging member and a pulling line attached to the second engaging member and for pulling the second engaging member from the outside of the insertion tube toward the first engaging member are provided on the inner surface of the insertion tube. A traction jig that contracts an insertion tube between a first engagement member and a second engagement member by engaging two engagement members and pulling a pull line.

  In the invention of claim 1, the traction jig includes a first engagement member and a second engagement member disposed behind the first engagement member. The first engaging portion engages with the tip of the insertion tube and is pulled in the axial direction of the insertion tube by a pulling line. The second engagement member can be engaged and disengaged from the inner surface of the insertion tube and has a pull line.

  When the insertion pipe attached with this traction jig is inserted into the existing pipe line and the first engagement member is pulled by the traction line, the insertion pipe moves while rubbing against the existing pipe line, particularly the inner surface of the curved portion, As this frictional force increases, the insertion tube extends. Therefore, when the second engagement member is engaged with the inner surface of the insertion tube and the pulling line is pulled from the outside of the insertion tube toward the first engagement member, the first engagement member and the second engagement are obtained. The insertion tube between the members is shortened. Thereby, whitening or breakage of the insertion tube due to the insertion tube extending in the axial direction can be prevented.

  The invention of claim 2 is an insertion method using the traction jig of claim 1, wherein a second engagement member is arranged behind the first engagement member in the insertion pipe, and the first engagement Pulling the joint member, inserting the insertion tube into the existing pipe line, engaging the second engagement member with the inner surface of the insertion tube, pulling the pull line, pulling the second engagement member, pulling This is an insertion method using a jig.

  The invention of claim 2 exhibits the same action as that of the invention of claim 1.

  According to this invention, the second engagement member is engaged with the insertion tube and the pulling line is pulled, so that the whitening or breakage of the insertion tube can be prevented.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  A pulling jig 10 according to an embodiment of the present invention shown in FIG. 1 is used to insert an insertion pipe 14 that can be expanded and contracted in an axial direction into an existing pipe line 16, and includes a first engagement member 12, A second engagement member 18 and a pulling wire 20 attached thereto are provided.

  As shown in FIGS. 1 and 2, the first engagement member 12 is attached to the tip of the insertion tube 14 and has, for example, two balls 48a and 48b. Through holes 50a and 50b are formed at the centers of the two balls 48a and 48b, respectively, and the traction line 46 is attached to the first engagement member 12 through the through holes 50a and 50b.

  The second engagement member 18 is a balloon-like member that can seal air, and is formed of an elastic material such as rubber. When air is supplied to the second engagement member 18, the second engagement member 18 expands, and when air is extracted from the second engagement member 18, the second engagement member 18 contracts. The size of the expanded second engaging member 18 is larger than the inner diameter of the insertion tube 14 and is set to fit into a recess on the inner peripheral surface of the insertion tube 14 described later. On the other hand, the size of the contracted second engagement member 18 is set to be smaller than the inner diameter of the insertion tube 14, and the contracted second engagement member 18 is inserted into the insertion tube 14. For this reason, the second engagement member 18 can be engaged and disengaged from the insertion tube 14. Further, the second engagement member 18 has an intake / exhaust port 22, and a drawing wire 20 is attached to the intake / exhaust port 22.

  The pulling wire 20 is formed of a tube or the like and has a strength for pulling the second engagement member 18. One opening is connected to the intake / exhaust port 22, and the other opening is connected to an air pump (not shown) that can supply air.

  The insertion tube 14 is formed of a synthetic resin such as polyolefin resin, nylon resin, or polyethylene terephthalate resin. The insertion pipe 14 is formed in a cylindrical shape, and the outer diameter of the insertion pipe 14 is set to be the same as or smaller than the inner diameter of the existing pipe line 16. A corrugated tube, a corrugated tube, or the like is used as the insertion tube 14, and the tube wall of the insertion tube 14 is formed in a wave shape. Concave portions 24 and convex portions 26 are alternately provided along the tube axis direction on the inner peripheral surface of the tube wall, and convex portions 28 corresponding to the concave portions 24 and concave portions 30 corresponding to the convex portions 26 are formed on the outer peripheral surface of the tube wall. They are provided alternately along the axial direction. The concave portions 24 and 30 and the convex portions 26 and 28 may be independent ring-shaped or continuous spiral shapes as long as they extend at right angles or almost right angles to the tube axis direction. May be. The insertion tube 14 expands and contracts in the axial direction by the recesses 24 and 30 and the protrusions 26 and 28.

  As shown in FIG. 3, the existing pipe line 16 includes a main pipe 32 and a branch pipe 36 branched therefrom by a first joint 34 such as cheese. The branch pipe 36 is formed by connecting a plurality of, in this embodiment, four straight pipes 38, and in this embodiment, three first to third joints 40, 42, and 44. (Not shown). Elbows and vents are used for the first to third joints 40, 42 and 44. The branch pipe 36 extends in the horizontal direction from the first joint 34, changes direction at the second joint 40, and further extends in the horizontal direction. Then, the direction is changed again at the third joint 42 and extends in the horizontal direction, rises at the fourth joint 44, extends in the vertical direction, and extends to a house or the like. For this reason, the existing pipe line 16 has a plurality of the first to fourth joints 34, 40, 42, 44, and in this embodiment, four curved portions 45.

  When inserting the insertion pipe 14 into the existing pipe line 16, as shown in FIGS. 1 and 3, first, the pulling line 20 and the traction line 46 are passed through the existing pipe line 16, and the opening 16 a on the housing side of the existing pipe line 16. The pulling wire 20 is connected to the air pump arranged in the above. Then, the insertion pipe 14 is disposed in the opening 16 b on the main pipe 32 side of the existing pipe line 16, and the first engagement member 12 and one traction jig 10 are attached to the insertion pipe 14.

  That is, the traction line 46 is attached to the first engagement member 12 through the through holes 50a and 50b. Next, the pulling wire 20 is passed through the through holes 50 a and 50 b of the first engaging member 12, and the tip of the pulling wire 20 is connected to the intake / exhaust port 22 of the second engaging member 18. At this time, the second engagement member 18 is contracted. Then, the contracted second engagement member 18 is inserted into the insertion tube 14 through the opening, and then the first engagement member 12 is inserted into the insertion tube 14 at a distance from the second engagement member 18. insert. Then, the distal end portion of the insertion tube 14 is reduced in diameter, and the inner diameter of the distal end opening 52 is formed smaller than the outer diameter of the first engagement member 12. As a result, the first engagement member 12 is engaged with the tip of the insertion tube 14, and the second engagement member 18 is disposed in the insertion tube 14 at a distance from the first engagement member 12. The Further, the pulling line 20 extends from the second engagement member 18 toward the first engagement member 12, exits from the distal end opening 52 together with the traction line 46, and opens to the house-side opening 16 a of the existing pipeline 16. Extend.

  After the first engagement member 12 and the second engagement member 18 are mounted on the insertion pipe 14, the pulling line 46 and the pulling line 20 are pulled from the housing-side opening 16 a of the existing pipe line 16, and the insertion pipe 14 The insertion pipe 14 is inserted into the existing pipe line 16 by pulling the first engagement member 12 in the axial direction from the outside. The insertion pipe 14 moves while rubbing against the existing pipe line 16, particularly the inner surface of the curved portion 45. Since this frictional force acts on the insertion pipe 14 at each curved portion 45, the frictional force acts on the movement resistance of the insertion pipe 14, that is, the entire length of the insertion pipe 14 every time the insertion pipe 14 passes through the curved portion 45. The frictional force to increase increases. Then, as the movement resistance increases, the insertion tube 14 cannot follow the first engagement member 12, and the insertion tube 14 extends in the axial direction as shown in FIG.

  If the insertion tube 14 extends too much in the axial direction and is plastically deformed, the insertion tube 14 is whitened or broken. In order to prevent this, if the movement resistance suddenly increases before the insertion tube 14 is plastically deformed, for example, when the insertion tube 14 passes through the curved portion 45 of the third joint 42, the second engagement member 18. When the bending portion 45 has been bent, as shown in FIG. 5, the second engagement member 18 is expanded, and the second engagement member 18 is engaged with the recess 24 of the insertion tube 14. Then, when the pulling wire 20 is pulled, as shown in FIG. 6, the second engagement member 18 is pulled in the direction of the first engagement member 12, and the first engagement member 12 and the second engagement member 18 are moved. The stretched portion of the insertion tube 14 returns to the state before stretching. Thereby, whitening or breakage of the insertion tube 14 due to plastic deformation is prevented.

  As described above, when the insertion tube 14 is contracted by the pulling jig 10 before the insertion tube 14 is plastically deformed, whitening or breakage of the insertion tube 14 is prevented. As a result, the insertion pipe 14 is inserted into the existing pipe line 16 without any defects such as whitening or breakage, and the existing pipe line 16 is rehabilitated by the insertion pipe 14. Improves. Further, since it is not necessary to remove defective portions such as whitening or breakage of the insertion tube 14, it is excellent in workability and economy.

  In addition, although the one 2nd engagement member 18 was inserted in the insertion pipe | tube 14, the some 2nd engagement member 18 can also be inserted. Thereby, even when there are many curved parts 45 of the existing pipe line 16, if the 2nd engaging member 18 is expanded in order, it can be drawn in a several location.

  Further, although the air pump that supplies air to the pulling wire 20 is connected, an air pump that can supply and discharge air may be connected instead. According to this air pump, after the second engagement member 18 is expanded, the second engagement member 18 can be contracted once, and the second engagement member 18 can be expanded again when necessary.

  Further, the pulling wire 20 has a role of pulling the second engagement member 18 and supplying air to the second engagement member 18 by using a tube. It can also be divided into a line for pulling the member 18 and a tube for supplying air. In this case, a traction line is attached to the second engagement member 18, and a tube is coupled to the intake / exhaust port 22 of the second engagement member 18. Thus, the strength for pulling the second engaging member 18 to the tube is not required by dividing the pulling wire 20.

It is sectional drawing which shows the state which attached the pulling jig of one Example of this invention to the insertion pipe | tube, and inserted the insertion pipe | tube into the existing pipe | tube. It is sectional drawing which shows the state which expanded the 2nd engagement member of the traction jig | tool shown in FIG. It is an illustration figure which shows the existing pipeline. It is sectional drawing which shows the state which the insertion pipe | tube with which the pulling jig | tool was mounted | worn was extended. It is sectional drawing which shows the state which expanded the 2nd engagement member. It is sectional drawing which shows the state which pulled the 2nd engagement member with the drawing line and shrunk the insertion pipe between the 1st engagement member and the 2nd engagement member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Traction jig | tool 12 ... 1st engagement member 14 ... Insertion pipe 16 ... Existing pipe 18 ... 2nd engagement member 20 ... Pulling line 24 ... Recessed part 46 ... Towing line

Claims (2)

A traction jig for inserting an insertion tube that can be expanded and contracted in an axial direction into an existing pipeline,
A first engagement member that engages with a tip of the insertion tube;
A traction line for pulling the first engagement member from the outside of the insertion pipe in the axial direction;
A second engagement member disposed behind the first engagement member in the insertion tube and capable of being engaged and disengaged from an inner surface of the insertion tube; and attached to the second engagement member; And a drawing line for drawing the second engaging member from the outside of the insertion tube toward the first engaging member,
The insertion tube between the first engagement member and the second engagement member is contracted by engaging the second engagement member with the inner surface of the insertion tube and drawing the pull line. Traction tool. An insertion method using the traction jig according to claim 1,
Placing the second engagement member behind the first engagement member in the insertion tube;
Pulling the first engagement member and inserting the insertion pipe into the existing pipe line,
An insertion method using a pulling jig, wherein the second engagement member is engaged with the inner surface of the insertion tube, the pulling line is pulled, and the second engagement member is pulled.

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