JP4472129B2 - Lining pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, Ri Oh relates lining pipe, in particular, to a lining pipe that is suitable for existing pipe line for retread.
[0002]
[Prior art]
Conventionally, as a method for rehabilitation of aging existing pipes made of reinforced concrete pipes (fume pipes), steel pipes, etc., new resin pipes of a predetermined length that are considerably smaller in diameter are sequentially inserted into existing pipes. Therefore, there is known a construction method in which a rehabilitation pipe line is laid and a backfilling material such as mortar or foamable resin material is injected into a gap between the existing pipe line and sealed.
[0003]
In the rehabilitation method using this backfill material, the inner diameter of the rehabilitation pipe line is considerably smaller than the inner diameter of the existing pipe line, so that there is a problem that the effective flow rate is reduced. Since it is necessary to inject a backfill material into the gap and seal it, there is a problem that workability is poor and rehabilitation work is slow.
[0004]
In addition, in the existing pipe lining method in which a plastic pipe liner is inserted into the existing pipe and is then brought into close contact with the existing pipe, it is necessary to reduce the cross-sectional outer area of the pipe liner and insert it into the existing pipe. There is.
[0005]
Therefore, for example, in JP-A-5-193002, a plastic tube having an outer diameter slightly larger than the inner diameter of an existing pipe is reduced in a heated state, and inserted into the existing pipe in this state, and then reheated. A method of restoring the original outer diameter and bringing it into close contact with the inner surface of the damaged pipe has been proposed.
[0006]
However, in the case of this method, there is a limit to the reduction ratio, and in order to increase the reduction ratio, there is a problem that its workability and workability are extremely deteriorated, such as slowing the mold passage speed.
[0007]
Further, as shown in FIG. 6, JP-A-64-56531 discloses that the tubular cross-section is crushed by bending in a diametrical direction along the vertical symmetry plane toward the opposite surface, and the above-mentioned symmetry. A vertically symmetrical pipe liner P is proposed in which the opposite side portion of the tubular cross section is bent into a double bag shape with respect to the surface.
[0008]
However, in the case of such a vertically symmetric pipe liner P, if it is made too flat to reduce the bending rigidity at the time of winding around the drum and make it easy to wind, the bending angle becomes abrupt and the bending distortion is caused. There is a possibility that it becomes excessive and breaks. In addition, when the steam is fed into the folded pipe liner to restore the shape to a cylindrical shape, there is a problem that a steam passage cannot be secured and uniform and sufficient restoration cannot be performed.
[0009]
Japanese Patent Application Laid-Open No. 10-278113 discloses that a flat tube formed by crushing a cylindrical hard tube is pulled out from the flat state by applying a processing roll in front of the inlet of the tube while pulling out the flat tube in a heated and softened state. There has been proposed a method of inserting into a pipe while deforming it into a letter-shaped folded state, expanding it by pressurization, and lining the inner surface of the pipe.
[0010]
However, even when such a flat tube is used, as described above, if it is too flat, the bending angle becomes abrupt and the bending strain becomes excessive, and there is a possibility that the flat tube will be broken. Moreover, since it is necessary to go through a complicated process of deforming from a flat state to a U-shaped folded state and applying an internal pressure to expand, there is a problem that workability is extremely poor.
[0011]
[Problems to be solved by the invention]
The present invention eliminates the above-mentioned conventional problems, minimizes bending distortion in the deformed state, does not cause cracks, etc. To provide a lining pipe that can be easily introduced from an existing manhole into an existing pipe line, and can ensure uniform and sufficient heating by ensuring a sufficient steam passage for restoring the shape. It was made for the purpose.
[0012]
[Means for Solving the Problems]
The invention according to claim 1 of the present application (present invention 1) is a lining pipe used for lining the inner surface of an existing pipe line by being inserted into an existing pipe and being heated, and is made of a thermoplastic resin. In a state where the shape is restored and the shape is restored to the cylindrical tube at the shape memory temperature, the overall cross-sectional outer area is reduced, and the cross-sectional shape has three loop-shaped folded portions, These loop-shaped folded portions are deformed into a flat state having a certain height such that they are arranged asymmetrically, and the radii of curvature at the tops of the three loop-shaped folded portions are r ₁ , r ₂ , r _3. When the maximum height in the direction perpendicular to the flattened direction of the looped folded portions at both ends is h ₁ , h ₂ , the overall height is H, and the outer diameter of the cylindrical tube after shape recovery is R 1 / 6R ≦ r ₁ , r ₂ , r ₃ ≦ 1 / 3R, and H < meet the relationship of h ₁ + h _2, a lining pipe that will be restored to the shape cylindrical supply steam to the tube.
[0013]
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[0014]
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[0015]
In the first aspect of the present invention, the loop-shaped folded portions are arranged asymmetrically. The plurality of loop-shaped folded portions in the cross-sectional shape of the lining pipe are not limited to the vertical direction and the horizontal direction, but in any other direction. Is also arranged so that there is no portion having a symmetric shape.
[0016]
In the present invention, examples of the thermoplastic resin include a hard vinyl chloride resin, polyethylene, and polypropylene. A hard vinyl chloride resin blended with a thermoplastic elastomer is preferably used.
[0017]
As the thermoplastic elastomer, such as ethylene - vinyl acetate copolymer (EVA), methyl methacrylate - butadiene - styrene copolymer (MBS), A acrylonitrile - butadiene rubber (NBR), methacryl resin (PMMA) or the like It is done. As a compounding quantity of a thermoplastic elastomer, 2-20 weight part is preferable with respect to 100 weight part of hard vinyl chloride resins.
[0018]
[Action]
The lining pipe of the first aspect of the present invention is formed of a thermoplastic resin, and the overall cross-sectional outer area is reduced in a state in which the shape is restored to the cylindrical pipe at a shape memory temperature, and the cross-section thereof The shape has three loop-shaped folded portions, and the loop-shaped folded portions are deformed into a flat state having a certain height such that they are arranged in an asymmetric shape, and each of the three loop-shaped folded portions is The radius of curvature at the top is r ₁ , r ₂ , r ₃ , the maximum height in the direction perpendicular to the flattened direction of the looped folded portion at both ends is h ₁ , h ₂ , and the overall height is H, Assuming that the outer diameter of the cylindrical tube after recovery is R, 1 / 6R ≦ r ₁ , r ₂ , r ₃ ≦ 1 / 3R, satisfy the relationship of H <h ₁ + h ₂ , and steam is introduced into the tube. the Rukoto restores the supply to the shape into a cylindrical shape, it abruptly the bending angle of the looped folded portion Therefore, cracks and the like do not occur, and the bending rigidity in the deformed state is small, so that it can be easily wound on the drum or introduced into the existing pipe line. Since a sufficient number of passages can be secured, uniform and sufficient heating can be performed to restore the shape to a uniform cylindrical tube.
[0019]
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[0020]
(Delete)
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of the lining pipe of the present invention.
[0022]
As shown in FIG. 1, the lining pipe 1 is made of a thermoplastic resin, and a recess 11 is formed on the outer periphery along the axial direction in a state in which the shape recovery performance is imparted to the cylindrical pipe at the shape memory temperature. And the cross-sectional outer diameter area is reduced, and the cross-sectional shape has three loop-shaped folded portions, the loop-shaped folded portions are arranged in an asymmetrical shape, and the whole is substantially J-shaped. It is transformed into a flat state having a height of.
[0023]
That is, the cross-sectional shape of the lining tube 1 is a loop shape along the axial direction until it is inscribed from one side portion along the axial direction toward a portion shifted by about ¼ from the diametrically opposed portion. The first loop-shaped folded portion 12 is formed by being crushed, and the second loop-shaped folded portion 13 and the third loop-shaped folded portion 14 along the axial direction are formed on both sides. A flat state in which the entire second loop-shaped folded portion 13 and the third loop-shaped folded portion 14 of the other end portion are compressed and deformed and have a certain height so as not to overlap in the vertical direction and the horizontal direction. Has been.
[0024]
Therefore, as compared with the conventional vertically symmetrical pipe liner P bent into a double bag shape as shown in FIG. 6, the bending angle of each loop-shaped folded portion 12, 13, 14 of the lining pipe 1 is not abrupt. In this way, it is possible to obtain a more flat folded state in which the width is slightly increased but the height is reduced. Since the bending rigidity in the folded state is more effective (the width is the first power and the height is the third power), the bending rigidity of the lining pipe 1 is smaller.
[0025]
For example, after the lining pipe 1 is laid in an existing pipe, steam is continuously supplied into the lining pipe 1 to restore the shape of the cylindrical pipe, and the cylindrical pipe is expanded by applying an internal pressure. Thus, it is used as a lining material that is fixed in close contact with the inner surface of an existing pipeline.
[0026]
As shown in FIG. 2, for example, a lining pipe 1 is manufactured by extruding a cylindrical pipe 10 with an extruder 21 using a hard vinyl chloride resin blended with a thermoplastic elastomer (mold). Set temperature 180 ° C.), the cylindrical tube is cooled by passing through the cooling water tank 22, and the deforming device 23 has a shape memory temperature of 70 ° C. from one side along the axial direction than the opposite portion in the diameter direction. A first loop-shaped folded portion 12 is formed by crushing in a loop shape along the axial direction until it is inscribed toward a portion shifted by about ¼, and a second loop-shaped folded portion along the axial direction is formed on both sides. The part 13 and the third loop-like folded part 14 are formed. Further, the entire first loop-shaped folded portion 13 on one side and the third loop-shaped folded portion 14 on the other end are compressed and deformed so as not to overlap in the vertical direction and the horizontal direction, and have a certain height. The flat lining pipe 1 is formed. For example, a method of pulling the lining pipe 1 with a pulling device 24 and winding it on the drum 26 via the traverse portion 25 is employed.
[0027]
As shown in FIG. 3, the winding state of the lining pipe 1 around the drum 26 is preferable because it can be stably wound so that the direction in which the contact area increases is directed inward.
[0028]
The lining pipe 1 has a plurality of loop-shaped folded portions in cross-sectional shape, and the loop-shaped folded portions 12 and 13 are deformed so that the loop-shaped folded portions are arranged asymmetrically. , 14 is not abruptly bent, so that cracks and the like do not occur, and the bending rigidity is small, so that winding on the drum 26 can be performed easily.
[0029]
Next, an example of a method for rehabilitating an existing pipe line using the lining pipe 1 will be described with reference to FIGS. 4 and 5. First, in the first step, as shown in FIG. 4, the drum 26 around which the lining pipe 1 compressed and deformed is wound is disposed on the ground of the starting manhole Q1.
[0030]
A tip tool 3 is fixed to the tip of the lining pipe 1 drawn out from the drum 26, and a wire is connected to the tip tool 3. From the start side manhole Q1, a guide 5, an existing pipe line 6, a guide 5 ', and a traveling direction side manhole. Through Q2, the lining pipe 1 is laid in the existing pipe line 6 so as to be pulled by the winch 4 disposed on the ground.
[0031]
Next, as shown in FIG. 5, in this state, steam is supplied from the steam generating / pressurizing device 7 into the lining pipe 1 to reach 70 ° C. which is the shape memory temperature of the original cylindrical pipe. Heat. Thereby, the lining pipe 1 is heated and restored to the cylindrical pipe 10. At this time, in the lining pipe 1, the folding angle of each loop-shaped folded portion 12, 13, 14 is not abrupt, so that a sufficient steam passage can be secured.
[0032]
Finally, compressed air is sent from the steam generating / pressurizing device 7 into the cylindrical tube 10 to be pressurized and expanded from the inside, and is brought into close contact with the inner surface of the existing pipeline 6, and is cooled and fixed in this pressurized state. The lining of the inner surface of the pipeline 6 is finished.
[0033]
(Examples) The present invention will be described below with reference to examples.
Example Using a thermoplastic resin composition in which 15 parts by weight of a thermoplastic elastomer (NBR) is blended with 100 parts by weight of a hard vinyl chloride resin, a cylindrical tube is formed from an extruder 21 by the manufacturing process described with reference to FIG. (Outer diameter 250 mm, wall thickness 10 mm) 10 is extruded (set temperature of the mold is 180 ° C.), the cylindrical tube 10 is cooled in the cooling water tank 22, and the deformation device 23 is used at a resin temperature of 70 ° C. As shown in FIG. 1, the lining pipe 1 whose cross-sectional shape was deformed so as to form an asymmetric shape was obtained and wound on the drum 26.
[0034]
The flat state of the lining pipe 1 is such that the radius of curvature r ₁ = 44 mm at the top of the _first looped folded part, the radius of curvature r _{2 at} the top of the second looped folded part, 48 mm, and the third looped folded. The radius of curvature r _{3 at} the top of the portion 12 is 50 mm, the maximum height h ₁ in the direction orthogonal to the flat direction of the loop-shaped folded portion at one end is 36.2 mm, and is orthogonal to the flat direction of the loop-shaped folded portion at the other end The maximum height h ₂ = 41.2 mm, the wall thickness d = 10 mm, the overall height H = 62.5 mm, and the width W = 215 mm.
[0035]
This lining pipe 1 could be started using a drum 26 having an inner cylinder outer diameter of 1.4 m, and the maximum possible winding length was 280 m. The outer diameter of the cylindrical tube obtained by restoring the shape of the lining tube 1 at the shape memory temperature was 250 mm.
[0036]
Accordingly, the lining pipe 1 has a relationship of 1 / 6R (= 41.7 mm) ≦ r ₁ (= 44 mm), r ₂ (= 48 mm), r ₃ (= 50 mm) ≦ 1 / 3R (83.3 mm). In addition, the relationship of H (= 62.5 mm) <h ₁ (= 36.2 mm) + h ₂ (= 41.2 mm) is satisfied.
[0037]
Using a thermoplastic resin composition similar to that in the comparative example, a lining pipe P in which the cross-sectional shape as shown in FIG. Wound on a drum. The flat state shown in FIG. 6 of this lining pipe P is such that the radius of curvature r ₁ ′ = 22 mm at the top of the first looped folded portion, the radius of curvature r ₂ ′ = 22 mm at the top of the second looped folded portion, The curvature radius r ₃ ′ = 20 mm at the top of the third loop-shaped folded portion, the height H ′ = 100 mm, and the width w = 170 mm. Further, the drum could only be started using a drum having an inner cylinder outer diameter of 1.6 m, and the maximum possible winding length was 215 m.
[0038]
【The invention's effect】
Since the lining pipe of the present invention is configured as described above, bending distortion in a deformed state can be minimized, cracking and the like do not occur, and winding on a drum, It can be easily introduced from the manhole at the time of construction into the existing pipeline, and a sufficient steam passage can be secured when the shape is restored , so that uniform and sufficient heating can be performed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a lining pipe of the present invention.
2 is a schematic view showing an example of a manufacturing process of the lining pipe shown in FIG. 1. FIG.
FIG. 3 is a partial cross-sectional view showing a winding state of the lining pipe shown in FIG. 1 on a drum.
4 is a cross-sectional view illustrating the first half of an example of a method for rehabilitating an existing pipe line using the lining pipe shown in FIG. 1. FIG.
FIG. 5 is a cross-sectional view for explaining the latter half of the process for rehabilitating the existing pipe line using the lining pipe shown in FIG. 1;
FIG. 6 is a perspective view showing an example of a conventional lining pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe | line for lining 11 Recessed part 12 1st loop-shaped folding part 13 2nd loop-shaped folding part 14 4th loop-shaped folding part

Claims (1)

A lining pipe used for lining the inner surface of an existing pipe line by being inserted into an existing pipe and being heated,
Formed from a thermoplastic resin, with the performance of restoring the shape of the cylindrical tube at the shape memory temperature, the overall cross-sectional outer area is reduced, and the cross-sectional shape has three loop-shaped folded portions. And the loop-shaped folded portions are deformed into a flat state having a certain height such that the loop-shaped folded portions are arranged asymmetrically, and the curvature radii of the top portions of the three loop-shaped folded portions are set to r ₁ , r ₂ and r ₃ , the maximum height in the direction perpendicular to the flat direction of the looped folded portion at both ends is h ₁ and h ₂ , the overall height is H, and the outer diameter of the cylindrical tube after shape recovery is when the R, restore a _{1 / 6R ≦ r 1, r} 2, r 3 ≦ 1 / 3R, meets the relationship of H <h ₁ + h _2, and supplies the steam to the tube shape on a cylindrical A lining pipe characterized by being made .

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