JP2002357292A - End structure of corrugated pipe and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the end structure of a corrugated pipe and its manufacturing method capable of easily connecting to a pipe body made of a different material from the corrugated pipe without using a pipe joint and considerably reducing the outside diameter of the connecting section. SOLUTION: The end structure for a corrugated pipe is formed connecting a polyethylene corrugated pipe 1 whose inner peripheral face is smooth and whose outer peripheral face has ridges 11 and valleys 12 sequentially and alternatively formed in parallel, with a straight hard polyvinyl chloride pipe 6. A spigot 21 of a transparent connecting socket 2 made of hard polyvinyl chloride having a socket 22 to which the straight pipe 6 is connected, is fitted to the inner periphery of the corrugated pipe 1. A polyethylene resin made fixing ring 3 is injection-molded astride both the outer periphery of the socket 22 of the connecting socket 2 and the outer periphery of the corrugated pipe end to fix them in a fitted and locked condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end structure of a corrugated pipe which can be connected to a pipe made of a different material, and to a method of manufacturing the corrugated pipe end.

[0002]

2. Description of the Related Art Conventionally, in the drainage field of detached houses,
Generally, a hard vinyl chloride resin tube is used. The hard vinyl chloride resin pipes are bonded together using a hard vinyl chloride resin pipe joint (socket, bend, or the like).

[0003] By the way, the evaluation method standards for easy maintenance and management performance of the "House Quality Assurance Promotion Act" enforced in June 2000 include "exclusive pipes except for the penetration of walls, floors, columns or beams. Not embedded in concrete ",
"In a detached house, the underground pipe is the structure of the building,
Not be buried under the slab or in the concrete solid foundation. "

Therefore, in order to secure a predetermined grade, it is no longer possible to bury pipes directly in slab concrete as in the prior art. A method of inserting a flexible pipe such as a corrugated pipe or a bellows hose into the sheath pipe for piping has been considered.

[0005] As a flexible pipe currently used, for example, a reinforcing material (outer layer) made of a spiral hard vinyl chloride resin for maintaining strength, as disclosed in Japanese Patent Application Laid-Open No. 11-37378, and a flexible pipe. It generally has a two-layer structure with a sheet-like flexible vinyl chloride resin hose body (inner layer) that follows. However, since this bellows hose is more expensive than the conventional hard vinyl chloride resin pipe, a corrugated pipe mainly composed of an olefin resin material with a smooth inner peripheral surface is used instead of this vinyl chloride resin bellows hose. It is getting attention.

[0006]

The method for joining the above-mentioned olefin resin corrugated pipes is disclosed in
The methods disclosed in JP-A-92113, JP-A-6-288495, JP-A-9-273692 and the like are general.

However, in the case of the waterproof joint structure of a corrugated conduit used for underground wiring disclosed in Japanese Patent Application Laid-Open No. 61-92113, an annular stopper formed in two parts is provided at the socket. Since the method is a method of fitting to a rib and connecting with a screw, there is a problem that the outer diameter of the entire waterproof joint becomes large. In addition, there is a problem that the water stopping performance of the connecting portion is affected by variations in dimensions of the conduit.

[0008] A different kind of pipe joint disclosed in Japanese Patent Application Laid-Open No. 6-288495 is divided into two parts in a radial direction including an axis, and includes a joint body having flanges at both ends, and also includes an axis. Although it is provided with a seal member radially divided into two and provided with flange portions at both ends, and a coupling member for fastening the flange portion of the joint body with the flange portion of the seal material interposed therebetween. Since the joint body and the sealing material are both divided into two parts, there is a problem that a considerable number of steps are required for assembling. Further, similarly to the above, there is also a problem that the outer diameter of the entire dissimilar pipe joint becomes large.

Further, the pipe connecting sleeve disclosed in Japanese Patent Application Laid-Open No. Hei 9-273692 is configured such that the electric welding coil provided on the inner peripheral wall portion is energized so that the concave and convex portions of the corrugated pipe and the sleeve are connected to each other. By heat-sealing the inner peripheral surface, the corrugated pipe and the smooth-surfaced pipe are connected.However, since the sleeve is an electro-fusion joint with a built-in coil, the joint structure becomes complicated. In addition, there is a problem that the cost is increased. In addition, since electricity is required, attention must be paid to safety during connection work.

An object of the present invention is to make it possible to extremely easily connect a pipe made of a different material without using a pipe joint, to make the outer diameter of a connection portion considerably compact, and to compare with a method using a pipe joint. It is an object of the present invention to provide an end structure of a corrugated pipe and a method of manufacturing the end of the corrugated pipe, which has good water stopping performance and is inexpensive.

Another object of the present invention is to satisfy the standards of the "Housing Quality Assurance Promotion Law", which was enforced from June 2000,
The end structure of the corrugated pipe and the end of the corrugated pipe can provide a drainage pipe structure that allows inspection, cleaning, partial repair, and replacement of the entire drainage pipe without damaging the house. It is an object of the present invention to provide a corrugated pipe which can be suitably used as a part of a drainage pipe through which a sheath tube previously buried in a portion penetrating a concrete slab is inserted.

[0012]

According to the first aspect of the present invention, there is provided a corrugated pipe having a smooth inner peripheral surface and having a peak and a valley formed alternately and continuously on an outer peripheral surface. Is an end structure of a corrugated tube for connecting to a tube made of a different material, and one end of a connection socket having a connection portion with the tube is provided on the inner periphery of the end of the corrugated tube. A fixed ring is injection-molded and fitted and fixed in a state of being prevented from falling out, between the outer periphery of the connection portion of the connection socket and the outer periphery of the end of the corrugated tube. .

According to a second aspect of the present invention, in the end structure of the corrugated tube according to the first aspect, the connection portion of the connection socket is used as a receiving port, and at least this receiving port is made transparent. .

According to a third aspect of the present invention, in the end structure of the corrugated pipe according to the first or second aspect, the corrugated pipe is made of a polyethylene resin, and the connected pipe body is made of a hard vinyl chloride resin. And the connection socket is made of a transparent hard vinyl chloride resin.

According to a fourth aspect of the present invention, in the end structure of the corrugated pipe according to the first aspect, the fixing ring is fitted via a seal ring attached to a valley on the outer periphery of the end of the corrugated pipe. They are fixed together.

According to a fifth aspect of the present invention, in the end structure of the corrugated tube according to the first aspect, a seal ring is provided on the outer periphery of one end of the connection socket fitted to the inner periphery of the end of the corrugated tube. It is the one that is attached.

According to a sixth aspect of the present invention, the inner peripheral surface is smooth and the outer peripheral surface is connected to the corrugated tube at the inner peripheral portion of the end portion of the corrugated tube in which the peaks and valleys are formed alternately and continuously. After fitting one end of a connection socket having a connection portion with a pipe made of a different material, the outer periphery of a diameter reduction preventing core in which a part of the outer peripheral surface shape has the inner peripheral surface shape of the connection socket The surface can be aligned with the inner peripheral surface of the connection socket and fitted to the socket, and then the fixing ring can be injection molded so as to straddle between the outer periphery of the end of the corrugated tube and the outer periphery of the end of the connection socket A metal mold is mounted on the outer periphery of the fitting portion between the corrugated tube and the connection socket, and the fixing ring is injection-molded.

According to the first aspect of the present invention, one end of a connection socket having a connection portion with a pipe is fitted to the inner circumference of the end of the corrugated tube, and the outer circumference of the connection portion of the connection socket is connected to the outer circumference of the connection portion. , Straddling between the outer circumference of the end of the corrugated pipe, and the fixing ring is injection molded and fitted and fixed in a retaining state, so it is possible to connect at the construction site without using a pipe joint By simply bonding (or rubber ring bonding) the end of the tube to the connection portion of the socket, it is possible to join the corrugated tube and a tube made of a material different from the corrugated tube.

According to the second aspect of the present invention, since the connection portion of the connection socket is a receiving port and this receiving port is transparent, for example, the connection socket is made of the same material as the straight pipe. If this is the case, the corrugated tube and the tube can be easily joined using an adhesive. If the connection socket is made of a material different from that of the tube, the rubber ring can be joined by using a rubber ring as the socket. And since the receptacle is transparent, the joining operation can be performed accurately while visually checking the length of insertion of the tube into the receptacle of the connection socket.

According to the third aspect of the present invention, the corrugated pipe is made of polyethylene resin, the pipe to be connected is made of hard vinyl chloride resin, and the connection socket is made of transparent hard vinyl chloride. Since it is made of resin, the connection socket and the tube can be joined using an adhesive.
And since the socket is transparent, there is no shortage of adhesive application, etc., and the joining work can be performed accurately while visually checking the insertion length of the tube into the socket of the connection socket. I can do it. As a result, a joint having good watertightness can be obtained.

According to the fourth aspect of the present invention, since the fixing ring is fitted and fixed via the seal ring attached to the valley on the outer periphery of the end of the corrugated tube, the inner peripheral surface of the fixing ring is fixed. And the watertightness between the outer peripheral surface of the end portion of the corrugated tube and the outer peripheral surface of the connection portion of the connection socket are further improved.

According to the fifth aspect of the present invention, since the seal ring is attached to the outer periphery of one end of the connection socket fitted to the inner periphery of the end of the corrugated tube, for example, the inner peripheral surface of the fixed ring Even if there is any problem in the adhesiveness between the outer peripheral surface of the end portion of the corrugated tube and the outer peripheral surface of the connection portion of the connection socket, it is possible to prevent water leakage from the inside of the tube or infiltration into the tube.

In the present invention, the fixing ring for connecting the corrugated tube and the connection socket is injection-molded using the diameter-reducing core and the mold, so that the pipe joint is not used. At the construction site, simply bond the end of the pipe to the connection part of the connection socket (or rubber ring), and the corrugated pipe and the pipe made of a different material The end structure of the corrugated pipe that can perform the joining operation can be obtained.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a semi-longitudinal sectional view of a main part showing a first embodiment of an end structure of a corrugated tube according to the present invention, and FIG.
5 is a semi-longitudinal sectional view showing the connection socket in FIG.

In FIG. 1, reference numeral 1 denotes a corrugated tube, in which the inner peripheral surface is smooth and solid ridges 11 and valleys 12 are alternately formed in parallel on the outer peripheral surface along the axial direction. A corrugated tube made of polyethylene resin. The peaks 11 are made of a high-density polyethylene resin, while the valleys 12 are made of a low-density polyethylene resin.

The connection socket 2 is made of a transparent material made of a hard vinyl chloride resin. As shown in FIG. 2, one end is a spigot 21 and the other end is a TS type receptacle 22. An annular projection 23 is integrally provided on the outer periphery near the boundary between the opening 21 and the receiving opening 22 along the circumferential direction. The outer diameter of the spigot 21 is smaller than the outer diameter of the receiving port 22, and the inner peripheral surface at the open end of the spigot 21 is a tapered surface. The end of the pipe 6 which is a drain pipe made of a hard vinyl chloride resin, which is a different material from the corrugated pipe 1, is connected to the receiving port 22, for example.

The material of the connection socket 2 is preferably the same as that of the pipe 6 which is a drain pipe, if it is to be bonded and connected, but it is of a different material such as polyethylene resin or polypropylene resin. Is also good.

As shown in FIG. 1, the spigot 21 of the connection socket 2 is fitted to the inner circumference of one end of the corrugated pipe 1, and the outer circumference of the receiving port 22 of the connection socket 2 and the corrugated pipe 1 The fixing ring 3 is injection-molded so as to straddle the outer periphery of the end portion, and is fitted and fixed in a retaining state. In other words, the inner surface side of the fixing ring 3 bites into the annular projection 23 protruding from the outer periphery near the boundary between the spigot 21 and the receiving port 22 and the two peaks 11 on the outer periphery of one end of the corrugated tube 1. Therefore, it is possible to prevent the connection socket 2 from coming out of the end of the corrugated tube 1. FIG.
As shown in the figure, the height of the projection 23 of the connection socket 2 is set to be substantially equal to the peak 11 of the corrugated tube 1.

Although not shown in FIG. 1, the spigot 21 of the connection socket 2 is fitted to the inner periphery of the other end of the corrugated tube 1 in the same manner. The fixing ring 3 is formed by injection molding so as to straddle between the outer periphery of the receiving port 22 and the outer periphery of the end portion of the corrugated tube 1 and is fitted and fixed in a retaining state.

In addition to the shrinkage of the injection-molded fixing ring 3 during cooling during injection molding, the spigot 21 of the connection socket 2 is present on the inner periphery of one end of the corrugated tube 1. Therefore, the adhesion between the inner peripheral surface of the fixing ring 3 and the outer peripheral surface of the socket 22 of the connection socket 2 and the outer peripheral surface of the end of the corrugated tube 1 is further improved, and the water stopping effect is further improved.

Further, since the connection socket 2 is made of a transparent hard vinyl chloride resin, the connection with the drain pipe 6 made of, for example, a hard vinyl chloride resin can be easily made by using an adhesive. Further, by being transparent, the adhesive can be applied to the inner surface of the socket 22 of the connection socket 2 without excess and deficiency, and the length of insertion of the drain pipe 6 into the socket 22 of the connection socket 2 can be reduced. It can be performed accurately while visually checking.

Next, a method of manufacturing the end structure of the corrugated tube of FIG. 1 will be described with reference to FIGS. First, as shown in FIG. 4, the spigot 21 of the connection socket 2 is fitted to the inner periphery of one end of the corrugated tube 1. Next, as shown in FIG. 5, the inner core 52 is inserted into the connection socket 2 from the opening end side of the socket 22. A part of the inner core 52 has an outer peripheral surface corresponding to the inner peripheral surface of the connection socket 2. Similarly, the outer molds 51a and 5 are divided into two over the outer peripheral surface of the receiving port 22 of the connection socket 2 and the outer peripheral surface of the end of the corrugated tube 1.
1b is arranged. As shown in FIG. 5, both outer molds 51a,
An annular cavity S into which polyethylene resin is injected and filled is formed between the inner peripheral surface of 51b, the outer peripheral surface of the receiving port 22, and the outer peripheral surface of the end of the corrugated tube 1.

In this cavity S, one outer mold 51
A polyethylene resin is injected and filled from an injection molding machine through a flow path 511 provided in a. At this time, since the inner core 52 is arranged in the connection socket 2, deformation of the socket 21 of the connection socket 2 due to the pressure of the filled resin can be prevented. After being cooled and solidified, the outer molds 51a, 51
By removing the b and the inner core 52, a corrugated tube 1 having an end structure as shown in FIG. 1 is obtained.

Details of the method of manufacturing the corrugated pipe end using the outer dies 51a and 51b and the inner core 52 will be described with reference to FIGS.
It will be described based on. FIG. 10 is an explanatory view of an inner core 52 which is a diameter reduction preventing core, and FIG. 11 is a view showing a state in which the inner core 52 is inserted into a corrugated tube 1 in a state in which a connection socket 2 is fitted to an end. FIG. 12 shows outer molds 51a and 51b.
FIG.

The inner core 52 includes a main body 521 formed of a solid metal cylinder, and a flange 522 formed at one end of the main body 521 in a flange shape. And the main body 52
1 is a socket 2 of the connection socket 2 on the flange portion 522 side.
2 is a receiving cylindrical portion 523 having an inner surface shape, and a spigot cylindrical portion 524 forming the inner surface shape of the spigot 21 on the other end side following the receiving cylindrical portion 523. Then, the inner core 52 is inserted into the receptacle 22 of the connection socket 2 from the receptacle cylindrical part 523 side, and when the flange part 522 comes into contact with the end peripheral surface of the receptacle 22, the receptacle cylindrical part 523 is formed. The spigot cylindrical portion 524 is fitted so as to be in close contact with the inner surfaces of the socket 22 and the spigot 21, respectively.

The outer mold 51 is formed by being divided into two parts, and is fixed and used.
Moving side mold 51b which locks with 1a to form outer mold 51
Consists of The fixed mold 51a and the movable mold 51b each have a housing shape, and the contact surface where the fixed mold 51a and the movable mold 51b are combined has an end portion of the corrugated tube 1. In the state where the connection socket 2 is fitted into the connection socket 2, a fitting groove 512 is formed in the connection socket 2 in which the semi-finished product in which the inner core 52 is fitted can be fitted. Further, a cavity S is formed in the fitting groove 512 in the shape of the fixing ring 3 into which a semi-finished product is fitted and injection molded. Then, the fixed mold 51
In the cavity S of a, a flow path 511 into which a material to be injection molded can flow is formed. Of course, the flow path 511 may be provided in the movable mold 51b. Further, the movable side mold 51b has a fitting groove 51 on the surface combined with the fixed side mold 51a.
2, a rod-shaped positioning protrusion 513 is provided upright, and the positioning protrusion 513 is provided on the fixed mold 51a.
A positioning groove 514 that can be fitted with the positioning protrusion 513 is formed at a position facing the.

Then, the fixed side mold 5 thus formed
1a, the connection socket 2 is fitted to the end of the corrugated tube 1 in the fitting groove 512, and the inner core 5 is further connected to the connection socket 2.
The semi-finished product fitted with 2 is set. Next, the moving mold 51b is moved to move the positioning protrusion 513 into the positioning groove 5.
14 and the movable mold 51b is fixed to the fixed mold 51a.
Is pressed. Next, in this state, the material of the fixed ring 3 to be molded is injected from the flow path 511 of the fixed mold 51a to injection-mold the fixed ring 3.

The semi-finished product including the connection socket 2 and the corrugated tube 1 with the inner core 52 fitted therein, the fixed mold 51a and the movable mold 51b are fitted with no gap therebetween, and are formed by injection molding. The injected resin does not leak due to the injection resin pressure at that time. The inner core 52 is fitted to the connection socket 2 to prevent the diameter of the connection socket 2 from being reduced due to the resin temperature, injection resin pressure, or the like during injection molding applied when the fixing ring 3 is injection-molded. It will be.

FIG. 3 is a semi-longitudinal sectional view of a main part showing a second embodiment of the end structure of the corrugated pipe according to the present invention. In this case, the fixing ring 3 is attached to the valley 12 on the outer periphery of the end of the corrugated tube 1.
It is fitted and fixed via a ring 4. As described above, since the fixing ring 3 is fitted and fixed via the O-ring 4, the inner peripheral surface of the fixing ring 3, the outer peripheral surface of the end portion of the corrugated tube 1, and the socket 22 of the connection socket 2 are formed. The water tightness with the outer peripheral surface is further improved, and as a result, the reliability of the water stopping effect is further increased.

FIG. 6 is a semi-longitudinal sectional view showing a third embodiment of the end structure of the corrugated tube according to the present invention, and FIG. 7 is a semi-longitudinal sectional view showing a connection socket in FIG. In this case, corrugated pipe 1
Is formed in a hollow shape, and one end of the connection socket 2 is formed as a spout 21 having an annular groove 211. A rubber ring 4 for sealing is mounted in the annular groove 211, and an outer periphery of the receptacle 22 is formed. The second embodiment is basically the same as the first embodiment except that a second projection 24 is integrally formed at a substantially center of the surface along the circumferential direction. Description is omitted.

The position of the annular groove 211 is determined so as to face the valley 12 of the corrugated pipe 1 as shown in FIG. In this case, the hollow ridges 11a, 11a of the corrugated tube 1 located inside the fixing ring 3 undergo compression deformation due to the resin pressure of the molten resin filled in the cavity S, and It is cut into the inner wall and locked. As a result, the connection socket 2 is securely prevented from coming off from the end of the corrugated tube 1.

As described above, since the sealing rubber ring 4 is mounted on the outer periphery of the spigot 21 of the connection socket 2 fitted on the inner periphery of the end of the corrugated tube 1, for example, the fixing ring 3
Of the inner peripheral surface, the outer peripheral surface of the end portion of the corrugated tube 1 and the outer peripheral surface of the socket 22 of the connection socket 2, water leakage from the inside of the tube or infiltration into the tube occurs. Absent.

The corrugated pipe 1 having the end structure shown in FIG. 6 can be formed by engaging a synthetic rubber annular seal member with the second projection 24 present on the outer peripheral surface of the receiving port 22. For example, by using as a part of a drainage pipe inserted into a sheath pipe buried in advance in a part penetrating a concrete slab of a detached house, the annular sealing material is pressed by the inner peripheral surface of the sheath pipe. On the opening end side of the sheath tube located outside the building, the gap between the sheath tube and the drain pipe can be closed in a watertight manner.

FIG. 8 is a semi-longitudinal sectional view showing a fourth embodiment of the end structure of the corrugated tube according to the present invention, and FIG. 9 is a semi-longitudinal sectional view showing a connection socket in FIG. In this case, the annular projection 23 of the connection socket 2 that provides the retaining function is positioned on the side of the socket 21, and its height is lower than the outer peripheral surface of the receptacle 22. 23
And knurling 2 on the outer peripheral surface near the
Since the third embodiment is basically the same as the third embodiment except that 3a is applied, the same portions are denoted by the same reference numerals and description thereof will be omitted.

As described above, by forming the annular projection 23 having a low height on the side of the spigot 21 of the connection socket 2, it is possible to prevent the outer diameter of the fixing ring 3 from increasing.
A corrugated tube 1 having a more compact end structure can be obtained.

Since the annular projection 23 and the outer peripheral surface near the receiving port 22 are knurled 23a, the adhesion to the fixing ring 3 is partially improved.
Further, a fifth embodiment in which the fixing ring 3 is formed from a resin to be injection-molded and a resin to be insert-molded will be described with reference to FIG.

In the fifth embodiment, the corrugated tube 1 and the connection socket 2 are the same as in the first embodiment. The fixing ring 3 includes an elastomer resin layer 31 made of an elastomer resin and a coating layer 32 made of a polyethylene resin. The elastomer resin layer 31 is provided on the semi-finished product in which the connection socket 2 is inserted into the inner periphery of one end of the corrugated tube 1 from the outlet 21 and fitted to the outer periphery near the boundary between the outlet 21 and the receptacle 22. Annular protrusion 23 and two peaks 11 on the outer periphery of one end of corrugated tube 1
Then, injection molding is performed with the inner surface side of the elastomer resin layer 31 biting. The coating layer 32 is formed on the valley 12 of the corrugated pipe 1.
To the receiving port 22 of the connection socket 2 so as to cover the elastomer resin layer 31 by injection molding.

As described above, by forming the elastomer resin layer 31 with the elastomer resin and further covering the upper surface of the elastomer resin layer 31 with the coating layer 32 to form the fixing ring 3, the fixing ring 3 has excellent elasticity. An elastomer resin layer 31 made of an elastomer resin is used as a coating layer 32.
And exhibits a higher water stopping effect between the corrugated pipe 1 and the connection socket 2.

[0049]

According to the first to fifth aspects of the present invention, one end of a connection socket having a connection portion with a pipe is fitted to the inner periphery of the end of the corrugated pipe. The fixing ring is formed by injection molding and is fitted and fixed in a retaining state so as to straddle between the outer periphery of the connection portion and the outer periphery of the end of the corrugated pipe. By simply bonding the end of the tube to the connection part of the connection socket (or rubber ring bonding), it is possible to join the corrugated tube with a tube made of a different material from this corrugated tube. I can do it. As described above, by using the corrugated pipe having the end structure according to the present invention, the work of laying the pipe on site is dramatically improved.

According to the second aspect of the present invention, since the connection portion of the connection socket is a receiving port and the receiving port is transparent, for example, the connection socket may be made of the same material as the pipe. If this is the case, the corrugated tube and the tube can be easily joined using an adhesive. If the connection socket is made of a material different from that of the tube, the rubber ring can be joined by using a rubber ring as the socket. And since the receptacle is transparent, the joining operation can be performed accurately while visually checking the length of insertion of the tube into the receptacle of the connection socket.

According to the third aspect of the present invention, the corrugated pipe is made of polyethylene resin, the straight pipe to be connected is made of hard vinyl chloride resin, and the connection socket is made of transparent hard vinyl chloride. Since it is made of resin, the connection socket and the straight pipe can be joined using an adhesive.
And since the socket is transparent, there is no shortage of adhesive application, etc., and the joining work can be performed accurately while visually checking the insertion length of the tube into the socket of the connection socket. I can do it. As a result, a joint having good watertightness can be obtained.

According to the fourth aspect of the present invention, since the fixing ring is fitted and fixed via the seal ring attached to the valley on the outer periphery of the end of the corrugated pipe, the inner peripheral surface of the fixing ring is fixed. And the watertightness between the outer peripheral surface of the end portion of the corrugated tube and the outer peripheral surface of the connection portion of the connection socket are further improved.

According to the fifth aspect of the present invention, since the seal ring is attached to the outer periphery of one end of the connection socket fitted to the inner periphery of the end of the corrugated tube, for example, the inner peripheral surface of the fixed ring Even if there is any problem in the adhesiveness between the outer peripheral surface of the end portion of the corrugated tube and the outer peripheral surface of the connection portion of the connection socket, it is possible to prevent water leakage from the inside of the tube or infiltration into the tube.

According to the sixth aspect of the present invention, the fixing ring for connecting the corrugated pipe and the connection socket is injection-molded using the diameter-reducing core and the mold, so that the pipe joint is not used. At the construction site, simply bond the end of the pipe to the connection part of the connection socket (or rubber ring), and the corrugated pipe and the pipe made of a different material The end structure of the corrugated pipe that can perform the joining operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a main part semi-longitudinal sectional view showing a first embodiment of an end structure of a corrugated pipe of the present invention.

FIG. 2 is a half longitudinal sectional view showing the connection socket in FIG.

FIG. 3 is a semi-longitudinal sectional view of a main part showing a second embodiment of the end structure of the corrugated pipe of the present invention.

FIG. 4 is a semi-longitudinal sectional view showing a state in which a spigot of a connection socket is fitted to an end of a corrugated tube.

FIG. 5 is an explanatory view showing a molding state for obtaining an end structure of the corrugated tube of FIG. 1;

FIG. 6 is a partial longitudinal sectional view showing a third embodiment of the end structure of the corrugated pipe of the present invention.

FIG. 7 is a semi-longitudinal sectional view showing the connection socket in FIG. 6;

FIG. 8 is a semi-longitudinal sectional view of a main part showing a fourth embodiment of the end structure of the corrugated pipe of the present invention.

9 is a half longitudinal sectional view showing the connection socket in FIG. 8;

FIG. 10 is an explanatory diagram of an inner core which is a diameter reduction preventing core.

FIG. 11 is an explanatory diagram showing a state in which a corrugated tube, a connection socket, and an inner core are fitted.

FIG. 12 is an explanatory diagram of an outer mold.

FIG. 13 is a semi-longitudinal sectional view of a main part showing a fifth embodiment of the end structure of the corrugated pipe of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated pipe 11, 11a Crest part 12 Valley part 2 Connection socket 21 Spout 211 Annular groove 22 Receptacle 23 Projection 24 Second projection 3 Fixing ring 31 Elastomer resin layer 32 Coating layer 4 Rubber ring for sealing (seal ring) ) 51 Outer mold 51a Fixed mold 51b Moving mold 511 Flow path 512 Fitting groove 513 Positioning protrusion 514 Positioning groove 52 Inner core 521 Main body 522 Flange section 523 Reception port cylinder section 524 Cross section cylinder section S cavity 6 Drainage Pipe (tube body)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 9/06 (72) Inventor Keiichi Nakamoto 4-14-8 Matsumoto, Saitama City, Saitama Musashi Chemicals, Inc. F term (reference) 3H017 DA01 3H019 FA06 FA08 FA14 5G357 DA02 DB01 DC01 DD01 DD05 DD10 DG05 5G369 AA05 BA04 DC04 DC09 EA01

Claims (6)

[Claims] 1. A corrugated pipe having a smooth inner peripheral surface and a ridge and a valley formed alternately and continuously on an outer peripheral surface, for connecting a corrugated pipe with a pipe made of a different material from the corrugated pipe. An end structure of a corrugated tube, wherein one end of a connection socket having a connection portion with the tube is fitted to an inner periphery of an end portion of the corrugated tube, and an outer periphery of a connection portion of the connection socket. An end structure of the corrugated tube, wherein the fixing ring is formed by injection molding so as to straddle the outer periphery of the end portion of the corrugated tube and is fitted and fixed in a retaining state. 2. The connection part of the connection socket is a socket,
2. The end structure of a corrugated tube according to claim 1, wherein at least the receiving port is transparent. 3. The corrugated pipe is made of polyethylene resin, the pipe to be connected is made of hard vinyl chloride resin, and the connection socket is made of transparent hard vinyl chloride resin. 3. An end structure of the corrugated tube according to 1 or 2. 4. The end structure of a corrugated tube according to claim 1, wherein the fixing ring is fitted and fixed via a seal ring attached to a valley on the outer periphery of the end of the corrugated tube. 5. The end structure of a corrugated tube according to claim 1, wherein a seal ring is attached to an outer periphery of one end of the connection socket fitted to an inner periphery of the end of the corrugated tube. 6. A corrugated pipe having a smooth inner peripheral surface and a ridge and a valley formed alternately and continuously on an outer peripheral surface, for connecting a corrugated pipe made of a material different from the corrugated pipe. A method of manufacturing an end of a corrugated pipe, wherein one end of a connection socket having a connection portion with a pipe made of a different material to be connected to the corrugated pipe is fitted around an inner periphery of the end of the corrugated pipe, A part of the outer peripheral surface shape is provided with the diameter-reducing core having the inner peripheral surface shape of the connection socket, and the outer peripheral surface of the diameter-reducing core is matched with the inner peripheral surface of the connection socket, and fitted to the connection socket, A mold capable of injection-molding a fixing ring so as to straddle between the outer periphery of the corrugated tube and the outer periphery of the connection socket is attached to the outer periphery of the fitting portion of the corrugated tube and the connection socket, and fixed. A method for manufacturing a corrugated pipe end, comprising injection-molding a ring.