JP2003191326A - Method for working radially enlarged faucet of tube with inner and outer smooth waves - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a flat rigidity of a rubber ring faucet from decreasing by not collapsing a rib, to surely connect a spigot of a tube to the faucet by reducing unevenness of an inner diameter of the faucet. <P>SOLUTION: A method for working a radially enlarged faucet of a tube with inner and outer smooth waves comprises the step of heating to soften the end 12d of the tube with the inner and outer smooth waves. The method further comprises the steps of radially enlarging the end 12d of the tube by third enlarging/contracting die 60 in a state in which a pressure hot gas is supplied to spaces 28a, 40 between an inner layer 18 and an outer layer 16 of the softened end 12d, thereby forming the rubber ring faucet 14. Since the end 12d of the tube is radially enlarged in a state in which the spaces 28a, 40 of the end 12d are pressurized, a rib 28 of the end 12 of the tube when the end 12d is radially enlarged is not collapsed by an elastic force of the layer 16. Since the rib 28 is not collapsed, an inner peripheral surface 14a of the faucet 14 is formed smoothly, and the unevenness of the inner diameter of the faucet 14 is reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a diameter-increasing receiving end of a pipe with smooth wave inside and outside, and is particularly used for drainage pipes for expressways or drainage pipes laid in residential land or parks. The present invention relates to a method for processing a diameter-increasing receptacle of a pipe with smooth wave inside and outside.

[0002]

2. Description of the Related Art Although there has been no conventional method for processing the diameter-enhancing port of a pipe with smooth waves on the inside and outside, a processing method shown in FIGS. 15 to 17 is conceivable. This processing method is shown in FIG.
As shown in (1), first, the tube 4 with inner and outer surface smooth waves is prepared.
The tube 4 is a tube made of synthetic resin in which the corrugated layer 3 is formed between the inner layer 1 and the outer layer 2. Then, the tube end 4a is heated to a temperature equal to or higher than the softening point and lower than the melting point. Next, FIG.
As shown in (B), the expansion / contraction die 5 is reduced in diameter and inserted into the tube end 4a. Then, as shown in FIG. 16 (A), the expansion / contraction die 5 in the reduced diameter state is brought into the enlarged diameter state, and the pipe end 4a.
Is spread from the inside to form the rubber ring receptacle 6. Then, after cooling the rubber ring receiving port 6, the expansion / contraction die 5 is reduced in diameter as shown in FIG. In this way, the processing of the rubber ring receiving port 6 shown in FIG. 17 is completed, and the tube 7 with inner and outer surface smooth waves is completed.

[0003]

However, in the method of processing the expanded diameter receiving port of the tube with smooth corrugated inner and outer surfaces shown in FIG.
As shown in (A), when the expansion / contraction die 5 is expanded, the inner peripheral surface of the outer layer 2 is not directly expanded by the outer peripheral surface 5a of the expansion / contraction die 5, and the corrugated layer 3 Is pushing through. That is, when the expansion / contraction die 5 moves in the diameter expanding direction, the ribs 8 having a trapezoidal cross section of the corrugated layer 3 formed in the rubber ring receiving port 6 are caused by the elastic force of the outer layer 2 to cause the tube body 4 b to move. It is squeezed toward the side of and is inclined. In this state, the side wall 8a on the inclined side of each rib 8 is bent. When the expansion / contraction die 5 is reduced in diameter and taken out from the rubber ring receiving opening 6, as shown in FIG. 17, the elastic ring receiving portion 6a is included due to the force of the bent side wall 8a of each rib 8 to expand. A large number of annular convex portions 1 a are formed on the inner peripheral surface of the rubber ring receiving opening 6. As a result, annular irregularities are alternately formed on the inner peripheral surface of the rubber ring receiving opening 6.

As described above, when the rib 8 of the rubber ring receiving port 6 is crushed, there is a problem that the rigidity of the rubber ring receiving port 6, particularly the flat rigidity, is reduced. If irregularities are formed on the inner peripheral surface of the rubber ring receiving port 6, the variation of the inner diameter of the rubber ring receiving port 6 becomes large. In some cases, it cannot be joined to the rubber ring receptacle 6. When the rubber ring receiving portion 6a is formed with irregularities, the rubber ring 9 cannot be housed exactly, so that the water tightness of the rubber ring 9 may not be maintained.

Therefore, a main object of the present invention is to form a diameter-increasing receiving port having a smooth inner peripheral surface without crushing the corrugated layer at the tube ends of the inner and outer surface smooth corrugated tubes.
An object of the present invention is to provide a method for processing a diameter-increasing receiving port of a pipe with smooth wave inside and outside.

[0006]

The present invention is a processing method for forming a diameter-increasing receiving end at the tube end of an inner-outer surface smooth corrugated pipe in which a corrugated layer is formed between an inner layer and an outer layer. a) Prepare an inner and outer surface smooth corrugated tube in which the corrugated layer is formed by a spiral rib,
(b) heating the tube end to soften it, and (c) expanding the tube end with the space between the inner and outer layers of the tube end pressurized.
This is a method for processing the expanded diameter inlet of a pipe with smooth wave inside and outside.

[0007]

The function is to prepare an inner and outer surface smooth corrugated tube in which the corrugated layer is formed by spiral ribs. Then, the tube end is heated to soften it. Next, the diameter-enlarging port can be formed by enlarging the diameter of the pipe end while pressurizing the space between the inner layer and the outer layer of the softened pipe end. In this way, the pipe end is softened and the pipe end is expanded in a state where the space between the inner layer and the outer layer of the pipe end is pressurized. It is not crushed by the elastic force of.
Since the corrugated layer is not crushed, the inner peripheral surface of the expanded diameter receiving port is formed smoothly without forming annular irregularities.

[0008]

According to the present invention, since the corrugated layer formed at the pipe end is not crushed during the diameter expansion, it is possible to prevent the rigidity of the diameter expansion receiving port, particularly the flatness rigidity, from being lowered. Further, since the inner peripheral surface of the inner layer of the diameter expansion receiving port can be formed to be smooth, it is possible to reduce the variation in the inner diameter of the diameter expansion receiving port. Therefore, the spout of the separately prepared inner and outer surface smooth wave-equipped tube can be exactly and surely joined to this expanded diameter receiving port as predetermined. When the rubber ring is attached to the expanded diameter receiving port, the inner surface is smooth, so that the rubber ring can be fitted exactly and the water tightness is surely maintained by the rubber ring.

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

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for processing a diameter-increasing receptacle for a pipe with smooth inner and outer surfaces according to the first embodiment of the present invention, and a pipe with smooth inner and outer surfaces formed by the method (hereinafter, simply referred to as "tube"). 10) will be described with reference to FIGS. This tube 10 is a single-sided receiving tube having a cross-sectional shape as shown in FIG. 9, and is made of synthetic resin such as polyethylene. It can be used as, for example, a drainage pipe for a highway or a pressureless drainage pipe laid in a residential land or a park, and includes a pipe body 12. This tube body 12
A rubber ring receiving port (hereinafter, also simply referred to as “rubber ring receiving port”) 14 for a pipe with smooth waves on the inner and outer surfaces is formed at one end of the one.

The rubber ring receiving port (expanding diameter receiving port) 14 is a tubular body having a circular cross section perpendicular to the tube axis and having a predetermined thickness. As shown in FIG. 9, the rubber ring receptacle 14 has an outer layer 16 and an inner layer 18, each of which has a substantially cylindrical shape.
And an corrugated layer 20 formed between the outer layer 16 and the inner layer 18, which are bonded to each other and integrated. One opening of the rubber ring receiving port 14 is formed as an insertion port into which the insertion port 12a of another equivalent tube 10 is inserted, and the annular tip peripheral edge 18a of the inner layer 18 and the outer layer 16 of this insertion port. And 18b are tightly connected to each other over the entire circumference. Further, the other opening edge of the rubber ring receiving port 14 is coupled to the end portion of the pipe body 12. Further, a rubber ring receiving portion 22 is formed on the inner peripheral surface 14a of the rubber ring receiving opening 14.

The rubber ring receiving portion 22 is an annular groove formed along the inner peripheral surface of the inner layer 18, and has the rubber ring 24 and the pressing member 24 mounted therein. The rubber ring 24 is shown in FIG.
As shown in FIG.
This is for maintaining the watertightness of this joint in the state where a is joined. The pressing member 26 is the rubber ring receiving portion 2
The hanger portion of the rubber ring 24 is pressed against the inner peripheral surface of the rubber ring receiving portion 22 in a state where the rubber ring 24 is fused. Thereby, when inserting the spigot 12a of the tube 10 into the rubber ring receiving port 14, it is possible to prevent the rubber ring 24 from rolling in the inserting direction along with the spigot 12a to be inserted. The pressing member 26 is a ring made of synthetic resin such as polyethylene.

The corrugated layer 20 is formed by ribs 28. As shown in FIG. 9, the rib 28 is a protrusion formed in a spiral shape along the outer peripheral surface of the inner layer 18 of the rubber ring receptacle 14, and protrudes toward the outside of the inner layer 18. The cross-sectional shape orthogonal to the circumferential direction is substantially trapezoidal, and the inside is hollow. This rib 28 is provided on the rubber ring receiving port 1
They are formed at a pitch where, for example, five cross sections appear in the cross sectional view of No. 4. Since the ribs 28 are formed on the rubber ring receiving port 14 in this manner, the rigidity of the rubber ring receiving port 14, particularly the flat rigidity, can be increased. Since the outer layer 16 is formed on the outer peripheral surface of the rubber ring receiving port 14, the bending strength of the rubber ring receiving port 14 is increased.

Further, as shown in FIG. 10, the rubber ring receiving port 1
4, the inner surface 12b of the tube body 12 of the tube 10 on the left side of the figure and the inner surface 12b of the tube body 12 of the center tube 10 of the figure are connected smoothly without a step. The inner diameter of the receiving port 14 is defined. by this,
Drainage is unlikely to be accumulated in the abutting portion of the pipe bodies 12 and 12, and dust is unlikely to be caught. The joint between the rubber ring receptacle 14 and the end of the pipe body 12 is also formed by the inner layer 18, the outer layer 16 and the corrugated layer 20.

As shown in FIG. 11, the tube body 12 has an outer layer 16 and an inner layer 18 each formed in a cylindrical shape, and a corrugated layer 2 formed between the outer layer 16 and the inner layer 18.
0, which are joined together to form one.
The inner layer 18, the outer layer 16 and the corrugated layer 20 of the pipe body 12 and the rubber ring receiving port 14 are connected to each other in a continuous manner. Is formed by one continuous spiral rib 28.

As shown in FIG. 11, the inner layer 18 is a cylindrical body having a predetermined thickness formed by spirally winding the first strip 30 at a pitch B, and the inner surface 12 thereof.
b is smooth. Then, the side edges 30 a of the first strip-shaped bodies 30 adjacent to each other are coupled via the second strip-shaped body 32. The corrugated layer 20 is formed by hollow ribs 28 provided along the longitudinal direction of the first strip 30. Since the rib 28 has a trapezoidal sectional shape, the corrugated layer 20 has a corrugated sectional shape. By increasing the thickness of the wall portion of the rib 28, particularly the thickness of the upper wall 34, the flat rigidity of the tube body 12 can be increased. Then, by making the rib 28 hollow, it is possible to provide a lightweight and highly rigid tube body 12. The outer layer 16 is a cylindrical body having a predetermined thickness formed by spirally winding the third strip 36, and the outer surface 12c thereof is smooth.

Next, with reference to FIGS. 1 to 9, a method of processing the rubber ring receiving port (expanding diameter receiving port) 14 of the inner and outer surface smooth corrugated pipe 10 shown in FIG. 9 will be described. First, as shown in FIG. 1, an inner / outer surface smooth wave tube 38 having the same structure as the tube body 12 is prepared.
The corrugated layer 20 of the inner and outer surface smooth corrugated tube 38 is formed by the spiral hollow rib 28 as described above,
A space 40 is formed between the rib 28. Then, as shown in FIG. 2, the portion corresponding to the rubber ring receiving port 14 formed at the tube end 12d is set to the softening point T1.
Above, it is softened by heating to a temperature below the melting point T2.

As a method of heating the tube end 12d, for example, the tube end 12d on the left side of the inner and outer surface smooth wave-equipped tube 38 shown in FIG.
A plurality of nozzles 42 are inserted from. That is, the tip of the predetermined nozzle 42 is inserted into the opening 28b of the hollow portion 28a of the rib 28 formed in a spiral shape, and another predetermined nozzle 42 is opened in the space 40 formed in a spiral shape. 40a. Then, hot air (for example, heated steam) is discharged from the tip of each nozzle 42, and the hot air is supplied into the hollow portion 28 a of the rib 28 and the space 40. Thereby, the tube end 12d can be heated to a predetermined temperature. Of course, before heating the tube end 12d with hot air, use an electric heater or the like to
May be preheated to a predetermined temperature, or the tube end 12d may have a softening point T1 or higher and a melting point T2 by another method.
You may heat to the temperature of less than.

However, a portion other than the tube end 12d corresponding to the rubber ring receiving port 14 of the inner and outer surface smooth wave-equipped tube 38 has a softening point T.
As shown in FIG. 2, the tube end (difference) 12a on the right side of the inner and outer surface smooth wave-equipped tube 38 is prevented from being heated to a temperature of 1 or more.
The opening 28 of the hollow portion 28a of the rib 28 formed on the
Cold air is supplied to the inside of each of the openings 40b of the space 40 and the space 40c. An annular cover 44 is attached to the opening 12a in order to prevent cold air from leaking from the openings 28c and 40b of the opening 12a. Cold air is supplied from a supply port 44a provided in the cover 44.

Next, as shown in FIG. 3, the peripheral edge of the left pipe end 12d in which the nozzle 42 is inserted is crushed,
The tip peripheral edges 18a and 16a of the inner layer 18 and the outer layer 16 other than the portion where the nozzle 42 is inserted are closely bonded to each other. As a method of closely bonding the respective tip peripheral edges 18a and 16a of the inner layer 18 and the outer layer 16 to each other, for example, as shown in FIGS. 3 (A) and 3 (B), the respective tip peripheral edges 18a and 16a are first expanded / contracted. There is a method of sandwiching the mold (first inner mold) 46 and the first outer mold 48 to tightly bond the two.

The first expansion / contraction die 46 comprises, for example, eight expansion / contraction members, and the outer peripheral surface 4 in the expanded state shown in FIG.
6a has a cylindrical shape, and the outer diameter has a dimension corresponding to the inner diameter of the inner layer 18. The first outer mold 48 is composed of a plurality of outer molds, and the inner surface 48a of each first outer mold 48 is formed in an arc shape. Each arcuate inner surface 48 of the first outer mold 48
As shown in FIG. 3 (B), a is the inner layer 18 and the outer layer between the outer peripheral surface 46a of the first expansion / contraction die 46 in the expanded state and the first outer mold 48 in the reduced diameter state. In the state in which 16 annular tip peripheral edges 18a and 16a are sandwiched, both of the distal peripheral edges 18a and 16a are formed to have a radius of curvature that can be brought into close contact with each other to be coupled. The inner surfaces 48a of the plurality of first outer molds 48 have a cylindrical shape with the diameter of the first outer molds 48 reduced.

However, as shown in FIG. 3B, a concave portion 50 having a shape corresponding to the shape of the nozzle 42 is formed on the inner surface 48a of the first outer die 48, and the first expansion / contraction die. Inner layer 18 and outer layer 16 between 46 and the first outer mold 48.
The plurality of nozzles 42 are prevented from being crushed with the tip peripheral edges 18a and 16a sandwiched therebetween.

By using the first expansion and contraction mold 46 and the first outer mold 48, the tip peripheral edge 18 of the inner layer 18 and the outer layer 16 is used.
When closely connecting a and 16a, the diameter of the first expansion / contraction die 46 is reduced by inserting it inside the tip peripheral edge 18a of the inner layer 18. Then, in this state, the first outer mold 48 is moved in a direction approaching the first expansion / contraction mold 46, and the inner layer 18 and the outer layer are provided between the first expansion / contraction mold 46 and the first outer mold 48. It suffices to sandwich the tip peripheral edges 18a and 16a of 16 with a predetermined force.

Next, as shown in FIG. 4, a cover 44 is attached to the spout 12a of the inner / outer surface smooth-wave tube 38. In this state, pressure hot air is discharged from each nozzle 42 attached to the left pipe end 12d, and pressure cold air is flown from the supply port 44a formed in the cover 44. As a result, the spaces 28a and 40 between the inner layer 18 and the outer layer 16 of the inner / outer surface smooth corrugated tube 38 are pressurized. That is, the hot air and the cold air are supplied into the hollow portion 28a of the spiral rib 28 and the spiral space 40, and the portion corresponding to the rubber ring receiving port 14 formed at the tube end 12d has a softening point T1. Above, it is softened by being heated to a temperature below the melting point T2, and is in a state of being slightly swollen by pressurized hot air or the like. However, the tube with smooth wave inside and outside 3
In the portion other than the tube end 12d where the rubber ring receiving port 8 of 8 is formed, the hollow portion 28a and the space 40 are pressurized, but since they are not softened, the tube end 12d is inflated. is not. Further, the cover 44 is attached in the same manner as in the state shown in FIG. 2, and is sealed by the rubber rings 52, 52 so that the pressure cold air does not leak from the joint between the cover 44 and the spout 12a. The first expansion / contraction die 46 and the first outer die 48 are removed from the tube end 12d.

Next, as shown in FIG. 5, the second inner mold 54 is inserted into the opening of the pipe end 12d in the state shown in FIG. 4 in a reduced diameter state, and the tip peripheral edge 18a of the pipe end 12d and The second outer mold 56 is arranged at a distance from the outer peripheral surface of 16a. The second inner mold 54 includes a second expansion / contraction mold 58 and a third expansion / contraction mold 60 provided at the tip of the second expansion / contraction mold 58.

Next, as shown in FIG. 6 (A), first, the second expansion / contraction mold 58 is brought into a diameter-expanded state, and the second expansion / contraction mold 58 is made.
The outer peripheral surface of is contacted with the inner peripheral surface of the tip peripheral edge 18a of the tube end 12d. Then, the second outer die 56 is pressed against the outer peripheral surface of the tip peripheral edge 16a with a predetermined force. In the state shown in FIG. 6 (A), the tip peripheral edges 18a and 16a of the tube end 12d are sandwiched and fixed between the second expansion / contraction die 58 and the second outer die 56. As described with reference to FIG. 12, the tube end 12d portion where the rubber ring receiving port 14 is formed is softened.
Further, the hollow portion 28a of the rib 28 and the space 40 are supplied with pressurized hot air and pressurized cold air to be pressurized, so that the softened tube end 12d is in a slightly expanded state.

Next, as shown in FIG. 6A, the peripheral edges 18a and 16a of the inner layer 18 and the outer layer 16 which are connected to each other are sandwiched between the second expansion / contraction die 58 and the second outer die 56. In this state, the diameter of the third expansion / contraction mold 60 in the reduced diameter state is set to the expanded state, and the tube end 12d is expanded from the inside to form the rubber ring receiving port 14. Then, the supply of the pressurized hot air from each nozzle 42 is stopped and the supply port 4 of the cover 44 is provided.
The supply of the pressure cold air from 4a is stopped, and the rubber ring receiving port 1
Cool 4. Then, as shown in FIG. 7, the second outer mold 56 is expanded and the tip peripheral edges 18a, 1 of the tube end 12d are formed.
6a, and the second and third expansion / contraction dies 58 and 60 are reduced in diameter. Then, as shown in FIG.
The nozzle 42, the second outer mold 56, and the second and third expansion / contraction molds 58 and 60 are removed from the rubber ring receptacle 14. Further, the cover 44 is also removed from the outlet 12a.

Next, as shown in FIG. 8, a cutter 62 is used to cut the peripheral edges 18a and 16a of the inner layer 18 and the outer layer 16 of the tube end 12d having the rubber ring receptacle 14 which are joined to each other. Remove. Thus, the rubber ring receptacle 14 shown in FIG. 9 is formed. Thus, the tip peripheral edge 18a
And rubber ring socket 14 shown in FIG.
Has a cylindrical inner peripheral surface 14a of the insertion port. Then, the tip peripheral edge 16a of the outer layer 16 and the tip peripheral edge 18a of the inner layer 18 of the rubber ring receiving opening 14 are in a state of being intimately bonded and coupled to each other over the entire circumference. That is, the hollow portion 28a of the rib 28 and the opening portion 28 of the space 40 on the rubber ring receiving port 14 side, respectively.
b and 40a are in a watertightly sealed state. In this way, the processing of the rubber ring receiving port 14 of the tube 10 with the smooth wave inside and outside is completed. Thereafter, as shown in FIG. 9, the rubber ring 24 is attached to the rubber ring receiving portion 22, and the pressing member 26 is fused. With this, the tube 1 with smooth wave inside and outside having the rubber ring 24 attached
0 is completed.

Next, the second inner mold 54 and the second outer mold 56 shown in FIG. 5 will be described. The third expansion / contraction mold 60 that constitutes the second inner mold 54 is, as shown in the front views of FIGS. 5 and 6A and the cross-sectional view of FIG. 12,
For example, it is composed of eight mold members 60a, and is configured to be expandable / contractible between the reduced diameter state shown in FIG. 5 and the enlarged diameter state shown in FIG. 6 (A). The third expansion / contraction die 60 has a substantially cylindrical outer shape in a diameter-expanded state, and an annular protrusion 60b is formed along the outer periphery at substantially the center. This ridge 60b
Is for forming the rubber ring receiving portion 22. The outer peripheral surface 6 of the third expansion / contraction die 60 other than the protrusions 60b.
0c is for forming the inner peripheral surface of the rubber ring receiving opening 14 other than the rubber ring receiving portion 22. Third expansion / contraction die 60
Expands and contracts as the eight mold members 60a are guided in the radial direction and move outward or inward, and the diameter in the expanded state is about 1.4 times the diameter in the contracted state.

The third expansion / contraction die 6 in the expanded state shown in FIG.
When 0 is brought into a reduced diameter state, first, the four mold members 60a having a shape expanding toward the inside are moved in the directions indicated by solid arrows and stopped at the inside position. Next, the four mold members 60a having a shape that narrows toward the inside may be moved in the direction indicated by the broken line arrow and stopped at the inside position. Then, when bringing the third expansion / contraction die 60 in the reduced diameter state into the expanded state, the procedure reverse to the above procedure may be performed. That is,
First, four mold members 60a having a shape that narrows toward the inside
Is moved to the outer position shown in FIG. Next, the four mold members 60a having a shape that expands toward the inside may be moved to the outside position shown in FIG.

The second expansion / contraction die 58 is the first expansion / contraction die 4
6 is equivalent to, for example, eight mold members 60a
5 and the expanded state shown in FIG. 6A can be expanded and contracted. Then, in the expanded state shown in FIG. 6, the outer peripheral surface has a cylindrical shape, and the outer diameter has a dimension corresponding to the inner diameter of the inner layer 18. These first
And the second expansion / contraction molds 46 and 58 can be expanded / contracted by a mechanism equivalent to that of the third expansion / contraction mold 60, and each of the eight mold members has a radius similar to that of the third expansion / contraction mold 60. It expands and contracts by moving to the outside or inside of the direction.

The second outer mold 56 is composed of a plurality of outer molds like the first outer mold 48. As shown in FIG. 6B, the inner surface 56a of each second outer mold 56 is It is formed in an arc shape. Each arcuate inner surface 56a of the second outer mold 56
Is an outer peripheral surface 58a of the second expansion / contraction die 58 in an expanded state,
The inner layer 1 is formed between the inner surface 56a of the second outer mold 56 in the reduced diameter state.
8 and the outer layer 16 in a state in which the annular tip peripheral edges 18a and 16a closely bonded to each other are sandwiched by a predetermined force,
The radius of curvature is formed so as to be in close contact with the outer peripheral surface of the outer layer 16. Then, the inner surfaces 56a of the plurality of second outer dies 56 have a cylindrical shape with the second outer dies 56 having a reduced diameter.

However, as shown in FIG. 6B, the inner surface 56a of the second outer die 56 has an inner surface 4a of the first outer die 48.
Similar to 8a, a recess 50 having a shape corresponding to the shape of the nozzle 42 is formed, and the inner layer 18 and the outer layer 16 are joined to each other between the second expansion / contraction mold 58 and the second outer mold 56. The plurality of nozzles 42 are not crushed with the peripheral edges 18a and 16a sandwiched therebetween.
Further, as shown in FIG. 6A, an inclined surface 56b and a cylindrical surface 56c are formed on the side surface of the tip portion of each second outer die 56. These inclined surface 56b and cylindrical surface 56c
6A, when the third expansion / contraction die 60 is in the expanded state as shown in FIG. 6A, it abuts the outer peripheral surface of the tube end 12d, and the outer peripheral surface is opened to the opening of the rubber ring receiving opening 14. It has a shape formed as an end portion.

According to the method for processing the rubber ring receiving port of the tube with smooth wave inside and outside, as shown in FIG. 6 (A), the rubber ring receiving port 1
4 is softened to supply pressurized hot air into the hollow portion 28a of the rib 28 and the space 40 between the inner layer 18 and the outer layer 16 of the pipe end 12d, and the pipe is pressurized. The diameter of the end 12d is expanded by the third expansion / contraction die 60. Therefore, the rubber ring receptacle 14 can be formed without the rib 28 (corrugated layer 20) of the tube end 12d being crushed by the elastic force of the outer layer 16 when the diameter is expanded. Because when the third expansion / contraction die 60 expands in the radial direction,
Corrugated layer 20 at tube end 12d in which rubber ring receiving port 14 is formed
However, it is in a state of being expanded by being pressurized by the hot compressed air, and the outer layer 16 is held from the inside by the hot compressed air. In this way, since the ribs 28 are not crushed, the inner peripheral surface 14a of the rubber ring receiving port 14 does not have annular irregularities unlike the conventional rubber ring receiving port 6 shown in FIG. Is formed.

Since the ribs 28 formed on the rubber ring receiving port 14 are not crushed during the expansion of the diameter, it is possible to prevent the rigidity of the rubber ring receiving port 14, particularly the flat rigidity, from being lowered. Then, the inner peripheral surface 1 of the inner layer 18 of the rubber ring receptacle 14
Since 4a can be formed smoothly, the rubber ring receiving port 1
The variation of the inner diameter of 4 can be reduced. Therefore, as shown in FIG. 10, the inlet 12a of the separately prepared inner / outer surface smooth corrugated tube 10 can be joined to the rubber ring receptacle 14 exactly and surely as predetermined. Further, since the inner surface of the rubber ring receiving portion 22 is also smooth, the rubber ring 24 can be housed exactly and the water tightness is surely maintained by the rubber ring 24.

Further, according to the pipe body 12, as shown in FIG. 11, the inner surface 12b is formed smoothly by the strip portion 30b of the first strip body 30, so that the flow resistance in the pipe body 12 is small. Therefore, the drainage and debris that flow down do not stay. The corrugated layer 20 is formed by the hollow ribs 28 of the first band-shaped body 30, and the space 40 is formed between the ribs 28 spirally wound and the ribs 28. In addition to the light weight of the pipe body 12, the rigidity, particularly the flat rigidity, is high. In addition, since the outer surface 12c is formed smoothly by the third strip-shaped body 36, the flat rigidity of the pipe body 12 can be increased, and the bending strength of the pipe body 12 and the rubber ring socket 14 can be increased. be able to.

When the pipe 10 with inner and outer surface smooth waves shown in FIG. 9 is used to form a sewage and drainage pipe, as shown in FIG. 10, the outlet 12a of one pipe 10 is connected to the other pipe 10 of the other pipe. The tube 10 may be sequentially joined by inserting it into the rubber ring receiving port 14 of the above. Of course, if necessary for repair or the like, the joint 12a of one of the pipes 10 to be joined to each other can be pulled out from the rubber ring receiving port 14 of the other pipe 10 to separate them.

As described above, the pipe 10 has the rubber ring receiving port 1
Since 4 is provided, it is possible to sequentially join without using a separate joint, and the piping work can be performed easily. Then, the outlet 12a of one pipe 10 is connected to the other pipe 10
Since the both can be joined by inserting them into the rubber ring receptacle 14, the joining work of the inner and outer surface smooth corrugated pipe 10 can be performed very easily and in a short time even for a beginner. The watertightness can be reliably maintained by the rubber ring 24.

Further, since the rib 28 is formed in the rubber ring receiving port 14 to enhance the rigidity of the rubber ring receiving port 14, especially the flat rigidity, the rubber ring receiving portion 22 and the rubber ring 2 are provided.
The deformation of No. 4 can be reduced, and the watertightness can be reliably maintained.

Further, as shown in FIG. 10, the tip peripheral edge 16a of the outer layer 16 and the tip peripheral edge 18a of the inner layer 18 of the rubber ring receiving port 14 are in close contact with each other, and the hollow portion 28a of the rib 28 and the space 40 are formed. The openings 28b and 40a on the rubber ring receiving port 14 side are watertightly sealed. Therefore, in the state where the pipes 10 are joined to each other, even if the drainage flows from the hollow portions 28a of the ribs 28 and the openings 28c and 40b on the side of the outlet 12a of the pipes 10 of the space 40, the drainage flows. Is a hollow portion 28a of the rib 28
And, it does not flow out into the ground through the space 40. And, the groundwater does not flow into the pipe 10.

In the case of the nominal 600, the outer diameter of the rubber ring receiving port 14 of the inside / outside smooth wave-equipped pipe 10 is about 815.
mm, the outer diameter of the tube body 12 is about 700 mm, and the inner diameter is about 60
The thickness of the tube wall of the tube body 12 is about 50 mm, and the pitch of the ribs 28 of the corrugated layer 20 is about 73 mm.

Next, with reference to FIG. 13 and FIG. 14, etc., a method of processing the expanded diameter receiving port of the inner / outer surface smooth corrugated tube of the second embodiment of the present invention, and the inner / outer surface smoothness formed by the processing method. Corrugated pipe (hereinafter sometimes simply referred to as "pipe") 6
4 will be described. The difference between the pipes 10 and 64 formed by the respective processing methods of the first embodiment and the second embodiment is that the pipe 10 of the first embodiment has a rubber ring receiving port 14 as shown in FIG. The rubber ring receiving portion 22 is formed on the rubber ring receiving portion 22, and the rubber ring 24 and the pressing member 26 are provided on the rubber ring receiving portion 22, while the pipe 6 of the second embodiment is provided.
In No. 4, as shown in FIG. 13, the rubber ring receiving portion 22 is not formed in the receiving port 66, and the rubber ring 68 is attached to the tip edge (opening edge) of the receiving port 66.

As shown in FIG. 13, the inner and outer surface smooth corrugated pipe 64 formed by the processing method of the second embodiment has a receiving port 66 formed in a cylindrical shape, and the receiving port of the receiving port 66 is inserted. A rubber ring 68 is attached to the leading edge forming the. This rubber ring 68 is formed with a flange portion 68a that spreads outward on one side edge, and three annular lips 68b are formed on the inner peripheral surface. This rubber ring 68 has a socket 66.
The outer peripheral surface thereof is in close contact with the inner peripheral surface 66a of the receiving port 66, and the flange portion 68a is engaged with the leading edge of the receiving port 66 in the state of being attached to the front edge of the receiving port 66.

When the inner and outer surface smooth wave-equipped pipes 64 shown in FIG. 13 are used to form sewage and drainage pipes, as shown in FIG. One way
2a may be inserted into the socket 66 of the other tube 64 and the tubes 64 may be sequentially joined. However, the inner peripheral surface 66a of the receiving port 66
The diameter of the inner peripheral surface 66a of the receiving port 66 is made slightly larger than the diameter of the outer peripheral surface of the outlet 12a so that the rubber ring 68 can be interposed between the inner peripheral surface 66a and the outer peripheral surface of the outlet 12a. Other than this, the pipe is the same as the pipe 10 of the first embodiment, the same portions are denoted by the same reference numerals, and detailed description thereof will be omitted.

Further, the difference between the processing method of the first embodiment and the processing method of the second embodiment is that in the processing method of the first embodiment, as shown in FIG. Although the rubber ring receiving port 14 is formed using the third expansion / contraction die 60 that it has, in the processing method of the second embodiment, although not shown in the drawing, the third expansion / contraction die 60 has a protrusion. In the process of forming the receiving opening 66 shown in FIG. 13 by using the fourth expansion / contraction die in which the strip 60b is removed, and in the processing method of the first embodiment, as shown in FIG. While the rubber ring 24 and the pressing member 26 are attached, in the processing method of the second embodiment, as shown in FIG. 13, the rubber ring 68 is attached to the tip edge of the receiving port 66. Other than this, since the processing method is the same as that of the first embodiment, detailed description thereof will be omitted.

The fourth expansion / contraction die of the second embodiment is the first
The third expansion / contraction mold 60 of the embodiment has the protrusions 60b removed, and like the third expansion / contraction mold 60 of the first embodiment shown in FIGS. 6 and 12, eight molds are provided. It consists of members. And, like the third expansion / contraction mold 60, the fourth expansion / contraction mold has a structure that can be expanded / contracted between a diameter-reduced state and an expanded-diameter state. ,
By expanding the diameter, the receiving port 66 can be formed by the outer peripheral surface thereof. Then, when the processing of the receiving port 66 of the inner and outer surface smooth corrugated tube 64 is completed, a rubber ring 68 is attached to the tip edge of the receiving port 66, as shown in FIG. This completes the inner and outer surface smooth wave tube 64 with the rubber ring 68 attached.

According to the processing method for the inlet of the inner / outer surface smooth corrugated tube, the rib (corrugated layer 20) 28 of the tube end 12d is elastic force of the outer layer 16 at the time of expanding the diameter, as in the first embodiment. Is not crushed by the inner surface 66 of the socket 66.
It is possible to form a smoothly. Therefore, the socket 6
It is possible to prevent a decrease in the rigidity of No. 6, especially the flat rigidity. And
As shown in FIG. 14, a tube 6 with a smooth wave inside and outside prepared separately
The four outlets 12a can be securely and securely joined to the receptacle 66 as predetermined. Since the inner peripheral surface 66a of the tip edge (opening edge) of the receiving port 66 is also smooth, the rubber ring 68 can be fitted tightly, and the rubber ring 68 reliably maintains watertightness.

Then, as in the case of the pipe 10 of the first embodiment, as shown in FIG. 14, the tip peripheral edge 16 of the outer layer 16 of the receiving port 66.
a and the tip peripheral edge 18a of the inner layer 18 are tightly coupled to each other, and the hollow portions 28a of the ribs 28 and the openings 28b and 40a of the space 40 on the receiving port 66 side are watertightly sealed. Therefore, in the state in which the pipes 10 are joined to each other, the hollow portions 28a of the ribs 28 and the openings 28c and 40b of the space 40 on the side of the inlet 12a of the pipe 10 respectively.
Even if drainage may flow from the
8 does not flow out into the ground through the hollow portion 28a of 8 and the space 40, and groundwater does not flow into the pipe 10.

However, in the processing methods of the first and second embodiments, as shown in FIG. 1, the length is relatively long (about 5 m).
Although the inner / outer surface smooth corrugated pipe 38 is processed to form the inner / outer surface smooth corrugated pipes 10 and 64 having the receiving ports 14 and 66, instead of this, a relatively short inner / outer surface smooth corrugated pipe is used. It can be processed to form a manhole joint with sockets 14, 66. When this manhole joint is attached to the wall portion of the manhole, the end portion of the pipe body may be inserted and fixed in the attachment hole formed in the wall portion.

Then, in the first and second embodiments, as shown in FIG.
And the first to third expansion / contraction molds 46, 5 shown in FIG.
Although 8 and 60 are used, other expansion and contraction dies may be used. In short, it can be inserted, for example, in the tube end 12d of the inner and outer surface smooth corrugated pipe 38 shown in FIG. 5 in a reduced diameter state, and by expanding the diameter, the tube end 12d is widened and the rubber ring receiving port 14 or Forming the socket 66, or the tube end 12d
Anything can be used as long as it can sandwich and hold the tip peripheral edges 18a and 16a.

Further, in the first and second embodiments, as shown in FIG. 2, the tip of each nozzle 42 is connected to the hollow portion 28a of the rib 28 and each opening portion 28b of the space 40.
And 40a, hot air is discharged from the tip of each nozzle 42, and the tube end 12d is heated by the hot air, but the tube end 12d may be heated by a method other than this. For example, a disk-shaped body (not shown) or an annular plate-shaped body (not shown) is pressed against the tube end surface where the hollow portion 28a of the rib 28 and the annular openings 28b and 40a of the space 40 are formed. The hot air is applied to the hollow portion 2 through the through hole formed in the disc-shaped body or the annular plate-shaped body.
8a and the space 40 may be supplied, and the tube end 12d may be heated by the hot air.

Further, in the first and second embodiments, FIG.
As shown in, when crushing a part of the peripheral edges 16a, 18a of the left tube end 12d into which the nozzle 42 is inserted,
No hot air is ejected from the nozzle 42, and the right side outlet 1
Although cold air is not supplied from the openings 28c and 40b of the hollow portion 28a of 2a and the space 40, respectively, as shown in FIG.
In a manner similar to that described with reference to each of the corresponding openings (28b, 40a) and (28c, 40).
Hot air and cold air may be supplied from b). It is preferable that the annular cover 44 shown in FIG. 2 is attached to each of the openings 28c and 40b of the outlet 12a, and cold air is supplied from the supply port 44a provided in the cover 44.

Then, in the first and second embodiments, as shown in FIG.
Although the tube end 12d is heated by the hot air discharged from the nozzle 42 as shown in, the tube end 12d may be heated by using a heating element (not shown) such as an electric heater instead. . In this case, heating elements are arranged outside and inside the tube end 12d (inside the opening) to heat the tube end 12d. However, the ribs 28 forming the corrugated layer 20 inside are heated to a predetermined temperature (softening). It is necessary to prevent the inner layer 18 and the outer layer 16 of the tube end 12d facing the heating element from being heated to a temperature equal to or higher than the melting point T2 before being heated to a temperature equal to or higher than the point T1 and lower than the melting point T2). Therefore, pipe end 1
2d is heated by a heating element, and the tube end 12
The outer surfaces of the inner layer 18 and the outer layer 16 of d (the outer surface 12c and the inner surface 12b of the tube end 12d) are supplied by blowing cold air so that the temperature of the inner layer 18 and the outer layer 16 is not heated to a temperature equal to or higher than the melting point T2. To do. By doing so, the outer layer 16, the inner layer 18, and the ribs 28 at the tube end 12d have a softening point T1 or higher and a melting point T2.
It can be heated to a temperature below.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an inner / outer surface smooth corrugated tube used in a method of processing a diameter-increasing receptacle of an inner / outer surface smooth corrugated tube according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the inner and outer surface smooth corrugated tube showing a state of heating the tube end of the inner and outer surface smooth corrugated tube of FIG. 1 showing the processing method of the first embodiment.

3A is a cross-sectional view of the inner and outer surface smooth corrugated pipe showing a state in which the tip peripheral edge of the pipe end of the inner and outer surface smooth corrugated pipe of FIG. 2 showing the processing method of the first embodiment is crushed and sealed; (B) is FIG.
It is sectional drawing which shows the state which cut | disconnected the front-end periphery of the sealed pipe end of (A) in the direction perpendicular to a pipe axis.

FIG. 4 is a cross-sectional view of the inner and outer surface smooth corrugated tube showing a state in which the tube ends of the inner and outer surface smooth corrugated tube of FIG. 3A showing the processing method of the first embodiment are heated and the inner layer is pressurized. is there.

FIG. 5 is a cross-sectional view of the inner and outer surface smooth corrugated tube showing a state in which a second inner die is inserted into the tube end of the inner and outer surface smooth corrugated tube of FIG. 4 showing the processing method of the first embodiment.

6A is a sectional view showing a state in which a diameter of a second inner die inserted into a pipe end of the inner and outer surface smooth corrugated pipe of FIG. 5 showing a processing method of the first embodiment is expanded, FIG. 6B is a sectional view showing a state in which the tip end edge of the sealed pipe end of FIG. 6A is cut in a direction perpendicular to the pipe axis.

FIG. 7 is a cross-sectional view showing the processing method of the first embodiment in a state where the diameter of the second inner die inserted into the tube end of the inner and outer surface smooth corrugated tube of FIG. 6A is reduced.

FIG. 8 is a cross-sectional view of the inner and outer surface smoothed wave tube showing a state in which a second inner mold is taken out from the tube end of the inner and outer surface smoothed wave tube of FIG. 7 showing the processing method of the first embodiment.

FIG. 9 is a view showing a processing method of the first embodiment, in which a rubber ring and a pressing member are attached to a rubber ring receiving portion formed on the pipe end by cutting the tip peripheral edge of the pipe end of the inner and outer surface smooth corrugated pipe of FIG. FIG. 3 is a cross-sectional view of the tube with smooth wave inside and outside showing the opened state.

FIG. 10 is a cross-sectional view showing a state in which a rubber ring receiving opening formed by the processing method according to the first embodiment of FIG. 9 is joined to an inlet of an inner / outer surface smooth corrugated pipe.

FIG. 11 is a partial enlarged cross-sectional view of the tube with smoothed inner and outer surfaces used in the processing method of the first embodiment shown in FIG.

12 is a side view showing a diameter-reduced state of a third expansion / contraction die used in the first embodiment shown in FIG.

FIG. 13 is a cross-sectional view of a pipe with smooth inner and outer surfaces showing a state in which a rubber ring is attached to the opening edge of the receiving port formed by the processing method according to the second embodiment of the present invention.

FIG. 14 is a cross-sectional view showing a state in which an inlet of an inner / outer surface smooth corrugated tube is joined to a receptacle formed by the processing method of the second embodiment of FIG.

15 (A) is a partial cross-sectional view showing an inner / outer surface smooth corrugated tube used in a conventional method for processing a diameter-enhancing port of the inner / outer surface smooth corrugated tube, and FIG. It is a fragmentary sectional view showing the state where the expansion and contraction metallic mold was inserted in the tube end of the tube with an external smooth wave.

FIG. 16 (A) shows a conventional processing method.
16B is a partial cross-sectional view of a tube with smooth corrugated inner and outer surfaces showing a state in which the expansion / contraction die of FIG. 16 is expanded, and FIG. It is a fragmentary sectional view of a tube with a smooth wave.

FIG. 17 is a partial cross-sectional view showing an inner and outer surface smooth corrugated tube formed by a conventional processing method and another inner and outer surface smooth corrugated tube joined to the rubber ring receptacle.

[Explanation of symbols]

10, 64 ... Tube with smooth wave inside and outside 12… Tube body 12a ... 12b ... Inner surface of tube body 12c ... External surface of tube body 12d ... tube end 14… Rubber ring socket 14a ... Inner peripheral surface of rubber ring receiving port 16… Outer layer 16a ... Edge peripheral edge of outer layer 18 ... Inner layer 18a ... Edge peripheral edge of inner layer 20 ... corrugated layer 22 ... Rubber ring receiving part 24, 68 ... Rubber ring 28 ... Ribs 28a ... Hollow part of rib 28b, 28c ... Opening 38 ... Tube with smooth wave inside and outside 40 ... space 40a, 40b ... Opening 42 ... Nozzle 46 ... First expansion / contraction mold 48 ... first outer mold 54 ... Second internal mold 56 ... second outer mold 58 ... Second expansion / contraction mold 60 ... Third expansion / contraction mold 66 ...

Continued front page    (72) Inventor Yoshishige Akeboshi             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Inside the Tavinyl pipe factory F-term (reference) 4F209 AG03 AG08 AG10 AG23 AH43                       AM26 NA22 NB01 NM02 NM10                       NP01

Claims (5)

[Claims] 1. A processing method for forming a diameter-increasing receiving end at a tube end of a smooth corrugated pipe having inner and outer surfaces in which a corrugated layer is formed between an inner layer and an outer layer, wherein the corrugated layer is spiral. A tube with inner and outer surface smooth waves formed by ribs, (b) heating the tube end to soften it, and (c) adding a space between the inner layer and the outer layer at the tube end. A method for processing a diameter-increasing receiving end of a pipe with smooth wave inside and outside, which expands the pipe end in a pressed state. 2. In the step (b), hot air is supplied between the inner layer and the outer layer to soften the tube end, wherein Processing method. 3. In the step (b), the pipe end is heated from inside and outside by a heating element, and cold air is supplied to the inner surface and the outer surface of the pipe end to soften the pipe end. Item 2. A method for processing a diameter-increasing receptacle of a pipe with smooth wave inside and outside according to Item 1. 4. The inner / outer surface smoothing wave according to claim 1, further comprising (d) closely bonding the respective tip peripheral edges of the inner layer and the outer layer of the expanded pipe end. The processing method of the pipe diameter expansion socket. 5. The method for processing a diameter-increasing receiving end of an inner / outer surface smooth corrugated pipe according to claim 1, wherein in step (c), a rubber ring receiving portion is formed at the same time.