JPH07198076A - Corrugated flexible pipe joint - Google Patents

Abstract

PURPOSE:To increase the compression quantity of a packing and improve water tightness by forming a packing holding cylinder, formed at the tip part of each cylindrical retainer, in such a way as to have slits at specified spaces and to have an outer diameter allowed to come in internal contact with the tapered inner peripheral surface of a joint body. CONSTITUTION:A corrugated flexible pipe joint is provided with a cylindrical joint body 1 having tapered inner peripheral surface 10 at both end parts, and a retainer 3 including a cylindrical bode 3 provided at its inner periphery with a spiral guide 34 corresponding to the spiral unevenness of a pipe 5. The retainer 3 is also provided at the tip part of the cylindrical body 30 with a packing holding cylinder 31 contractible in diameter and having such an outer diameter as to be internally mounted to the tapered inner peripheral surface 10. A cylindrical packing 4 accommodated in the packing holding cylinder 31 is pushed into the tapered inner peripheral surface 10 by the fastening of a clamping nut 2. That is, when the clamping nut 2 is screwed with the retainer 3, the retainer 3 is drawn to the inside of the joint body 1, and each piece of the packing holding cylinder 31 is contracted in diameter from the tip part by the tapered inner peripheral surface 10 so as to bring the packing 4 into pressure contact with the pipe 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a joint for connecting corrugated flexible pipes whose peripheral walls are formed in a spiral wave shape in a watertight state, and more specifically, to a fastening nut. The present invention relates to a corrugated flexible pipe joint having a structure in which a space between pipe ends of the flexible pipes and a joint housing is sealed by a screwing force in a watertight state via a packing.

[0002]

2. Description of the Related Art Recently, electric cables, communication cables and other cables are often buried underground. These cables are buried in the ground while being passed through a flexible pipe with a corrugation to protect them from moisture and moisture, and in many cases, a flexible pipe whose peripheral wall is formed in a spiral wave shape. When connecting these pipes, a watertight (waterproof) joint means is required.

In general, this type of joint has flanges on both sides along the length direction, has an arc-shaped cross section, and has spiral irregularities on the inner surface that substantially match the spiral irregularities (helical pitch) of the flexible pipe. A split type (lower upper type) joint in which packing is mounted inside is known. This joint is made by abutting the ends of flexible pipes with each other with the spiral irregularities of the pipe aligned with the spiral irregularities of the lower mold, and then overlapping the upper mold to match the spiral irregularities of the pipe, and the flange parts of the upper and lower molds. Connect the flexible pipes with each other by tightening multiple bolts and nuts.

The above-mentioned split type joint is very troublesome to install packings on the upper and lower molds and tightens a plurality of bolts, etc. It is difficult to match the spiral irregularities. Further, if the upper and lower molds are bolted while the spiral irregularities of the pipe and the spiral irregularities of the upper and lower molds do not match, watertightness or waterproofness cannot be maintained.

Further, as conventional joints which are not of the two-split type, there are Japanese Unexamined Patent Publication (Kokai) No. 60-104894 and Shokai No. 60-.
There is one disclosed in Japanese Patent No. 62692. As shown in FIG. 9, these joints are provided with a tapered portion c having a small diameter on the inner side on the inner periphery of the connecting portion body b on one side of the collar a, and the end of the corrugated pipe d with spiral wave made of thin metal to be connected. A metal sleeve g having a spiral unevenness e that matches the spiral unevenness of the corrugated pipe d and a tapered outer peripheral surface f that fits in the tapered portion c with a tightening margin. The sleeve g is attached to the end of the pipe d in a state where a few ridges protrude from the tip of the sleeve g, and the sleeve g is fixed to the inner side of the main body b by tightening a cap nut h screwed with a male screw formed on the main body b. And press the sleeve g from the circumferential direction to crimp the inner circumference of the sleeve g to the outer surface of the pipe d, and crimp the tip of the pipe d to the ring-shaped asbestos packing i inserted into the bottom of the connection body b. is doing. j is
It is a tubular bolt part for attaching a joint to equipment (not shown). The inner and outer surfaces of the sleeve g are coated with a non-drying sealant or covered with a plastic material to maintain the adhesiveness of the portion.

[0006]

However, sufficient watertightness cannot be maintained only by applying a non-drying sealing material or a plastic material on the inner and outer surfaces of the sleeve g.
Further, in the above-mentioned structure, the compression amount of the sleeve g is extremely small and the tightening margin (compression amount) is very small. Therefore, even if the packing (rubber) is inserted into the inner and outer surfaces of the sleeve g, sufficient watertightness is maintained. Hateful. An object of the present invention is to provide a more sufficient connection portion in a joint having a structure in which the pipe ends of the flexible pipes and the joint housings are sealed in a watertight state via a packing by a screw tightening force of a tightening nut. Another object of the present invention is to provide a corrugated flexible pipe joint that can maintain water-tightness and can be easily connected to each other.

[0007]

In order to achieve the above object, a first corrugated flexible pipe joint according to the present invention is a joint for connecting corrugated flexible pipes each having a peripheral wall formed in a spiral wave shape. Each is provided with a cylindrical joint body having the following structure, a pair of retainers, a pair of tightening nuts, and a pair of cylindrical packings.
That is, the joint body has a pair of tapered inner peripheral surfaces having a smaller diameter from both ends toward the center. The pair of retainers are formed on a cylindrical main body having a spiral guide corresponding to the spiral irregularities of the flexible tube on an inner circumference thereof, and are formed at a tip end portion of the cylindrical main body, and have slits at predetermined angular intervals and within the taper. It is composed of a packing holding cylinder having an outer diameter capable of being inscribed in the large diameter side portion of the peripheral surface. The pair of tightening nuts have one end rotatably locked to the outer periphery of the joint body and the other end screwed to the outer periphery of the cylindrical body, or one end screwed to the outer periphery of the joint body. In addition, the other end is rotatably locked to the cylindrical body. The pair of packings have spiral irregularities corresponding to the spiral irregularities of the flexible pipe on the inner circumference, and are configured to be accommodated in the packing holding cylinder in a state in which the tip portion slightly projects from the tip portion of the packing holding cylinder. Has been done. The above-mentioned slit of the packing holding cylinder is preferably a V-shaped slit that expands in the tip direction.

A second corrugated flexible pipe joint according to the present invention is characterized by including a pair of retainers configured as follows, instead of the pair of retainers in the first joint described above. That is, this retainer is composed of a cylindrical main body having a spiral guide corresponding to the spiral irregularities of the flexible pipe on the inner circumference thereof, and a packing holding cylinder formed at the tip of the cylindrical main body, and the packing holding cylinder is
The packing holding pieces and the connecting pieces shorter than the packing holding pieces are alternately arranged so as to form a cylindrical shape as a whole. Further, each packing holding piece is separated from the cylindrical main body, and the tip end portions have an outer diameter capable of coming into contact with the larger diameter side portion of the taper inner peripheral surface, and the packing inner peripheral surface and the taper inner peripheral surface. Each of the connecting pieces has a tapered outer peripheral surface with a substantially matching inclination, and each connecting piece is integral with the cylindrical body and is connected to an adjacent packing holding piece via a thin knockout or hinge portion. Also in this second corrugated flexible pipe joint, the packings are configured to be accommodated in the packing holding cylinders such that their tip ends project slightly from the tip ends of the packing holding cylinders in the respective retainers. .

In each of the joints according to the present invention described above,
It is preferable to form an inner flange on the inner circumference of the central portion of the joint body. Further, in each joint according to the present invention, it is preferable that each component except the packing is molded of synthetic resin.

[0010]

According to the first corrugated flexible pipe joint of the present invention, the packings are accommodated in the packing holding cylinders of the retainers, and the tips of the packings project slightly from the ends of the packing holding cylinders and the flexible pipes. In this state, the packing and the retainer are attached to the ends of the respective flexible pipes, and in this state, the tips of the retainers are applied to both ends of the joint body, and the tips of the packings are substantially aligned with each other in the joint body. When the tightening nuts are screwed until they are pressed at the central portion, the corrugated flexible pipes are connected in a watertight state. When each tightening nut is screwed in the above-mentioned manner, each retainer moves toward the center in the joint body, and with this, each piece of each packing holding cylinder separated by the slit and in a cantilever state , Is gradually narrowed in the axial direction from the tip portion by the tapered inner peripheral surface of the joint body. And finally, the packing tips that are slightly protruding from the packing holding cylinder are pressed in a state where the tips of the packings are in abutment with each other, or are pressed by the inner flange, and the packing is in the axial direction as far as it is located in the tip direction. (That is, to the corrugated flexible pipe peripheral surface), the state is more strongly compressed. This action has an outer diameter that allows the tip of the packing holding cylinder in the retainer to be inscribed in the larger-diameter side portion of the tapered inner peripheral surface of the joint body. This is because the amount of compression corresponding to the difference between the outer diameter of and the outer diameter of the tip of the packing holding cylinder before being pushed (the angle of the tapered inner peripheral surface of the joint body) can be obtained. Therefore, the packing becomes more watertight toward the tip.

The procedure for connecting the pipes by the second corrugated flexible pipe joint of the present invention is substantially the same as that of the first corrugated flexible pipe joint described above. That is, when each tightening nut is screwed in the above-mentioned manner, each retainer moves toward the center in the joint body, and accordingly,
Each retainer in the packing retainer cylinder of the retainer is pushed in with the taper outer peripheral surface contacting the taper inner peripheral surface of the joint body while approaching in a state substantially parallel to the axial direction, and the inner packing is flexible over its entire length. Compress by pressing on the peripheral surface of the tube almost uniformly. And finally, the tips of the packings slightly protruding from each packing holding cylinder are pressed against each other or pressed by the inner flange, and each packing is applied with almost uniform force over its entire length. It is pressed against the surface of each flexible tube. When each packing holding piece approaches the axial direction, the knockouts on both sides of each packing holding piece are cut, or the hinge portions on both sides extend to separate each packing holding piece. The other actions are substantially the same as the actions of the above-mentioned first corrugated flexible pipe joint.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the flexible pipe joint according to the present invention will be described with reference to FIGS. FIG. 1 is a semi-cut sectional view showing a state in which a part of a joint of an embodiment corresponding to claim 1 is disassembled, and FIG. 2 is a semi-cut sectional view showing a state in which corrugated flexible tubes are connected to each other from the state shown in FIG. Is a semi-cut sectional view showing a state in which flexible pipes are connected to each other by a joint of an embodiment corresponding to claim 2, FIG. 4 is a view of a retainer in the joint of FIG. 3, (A) is a front view thereof,
FIG. 5B is a half-cut sectional view thereof, FIG. 5 is a partially enlarged view of the retainer of FIG. 4A, FIG. 6 is a partial sectional view showing a modified example of the joint of FIGS. 1 and 2, and FIG. 7 is a joint of FIG. 9A and 9B are views showing a modified example of the retainer in FIG. 7, FIG. 8C is a front view thereof, FIG. 8D is a half cutaway view thereof, and FIG. 8 is a partially enlarged view of the retainer of FIG. 7C.

The joint body 1 is formed of synthetic resin into a substantially cylindrical shape, and has tapered inner peripheral surfaces 10 having a diameter gradually decreasing toward the center and stoppers 11 formed on the outer periphery at both ends thereof. And a central portion has an inner flange 12 having an inner diameter substantially the same as the minimum inner diameter (groove bottom inner diameter) of the corrugated flexible tube 5 described later.

At both ends of the joint body 1, the tip portions of the respective tightening nuts 2 made of synthetic resin are rotatably mounted while being locked to the stopper 11. Each of these tightening nuts 2 has a female thread portion 20 on the inner circumference of the rear end portion and has a convex portion 21 or a wrench hook portion along the axial direction on the outer circumference. In this embodiment, both ends of the joint body 1 are bent at fixed intervals so as to reach the stopper 11 so that both ends of the joint body 1 can be easily bent in the axial direction when the tightening nut 2 is mounted. Then 4
A plurality of slits 13 are formed at an angular interval of 5 °).

The retainer 3 made of synthetic resin is formed integrally with a short cylindrical main body 30 and a tip portion of the main body 30, and has a packing holding cylinder 31 having a smaller outer diameter and a larger inner diameter than the main body 30. It consists of and. The packing holding cylinder 31 has slits 32 along the axial direction at a constant interval (angle interval of 45 ° in this example),
The outer diameter is such that it can be inscribed on the larger diameter side of the tapered inner peripheral surface 10 of the joint body 1. The cylindrical body 30 includes
A male screw portion 33 that matches the female screw portion 20 of the tightening nut 2 is formed on the outer periphery thereof, and a spiral guide 34 corresponding to the spiral unevenness 50 of the flexible tube 5 is formed on the inner periphery thereof. The spiral guide 34 in this embodiment is a ridge guided in the groove in the spiral unevenness 50 of the flexible tube 5, but it may be a groove in which the ridges of the spiral unevenness 50 are guided, and the spiral projections thereof are not limited. The number of strips or spiral grooves may be multiple or one.

The packing 4 is formed of rubber into a cylindrical shape, has an outer diameter capable of being inscribed in the packing holding cylinder 31, and its length is slightly longer than the packing holding cylinder 31.
A spiral unevenness 40 corresponding to the spiral unevenness 50 of the flexible tube 5 is formed on the inner circumference thereof. Further, when the packing 4 is attached to the end portion of the flexible pipe 5 at a tip portion of the packing 4 by a procedure described later, the flexible pipe 5
Is formed with an inner edge 41 against which the tip end of.

The procedure for connecting the pipe ends of the corrugated flexible pipe 5 to each other will be described below. First, each packing 4 is housed in the packing holding cylinder 31 of each retainer 3, and the tip of the packing 4 has the flexible pipe 5 and the packing holding cylinder 31.
The packing 4 and the retainer 3 are attached to the pipe end portions of both the flexible pipes 5 and 5 in a state of slightly protruding from the tip of the.
At this time, the spiral guide 3 of the cylindrical body 30 of the retainer 3
It is preferable that markings (not shown) are attached to the ends of the packing holding cylinder 31 and the packing 4 so that the spiral unevenness 40 of the packing 4 can be easily matched with the spiral unevenness 40 of the packing 4. In addition, the packing 4 is placed in a state where the spiral guide 34 and the spiral unevenness 40 are aligned with each other.
It is preferable to insert the above into the packing holding cylinder 31 in advance, and in this state, screw the retainer 3 and attach it to the pipe end of the flexible pipe 5 in the state of FIG. However, the retainer 3 is first screwed into the end of the pipe 5 and then the packing 4 is placed in the packing holding cylinder 31.
It may be attached to the end of the device by screwing. With the packing 4 and the retainer 3 attached to the pipe ends of the flexible pipe 5, the tip ends of the respective retainers 3 are applied to the both ends of the joint body 1 as shown in FIG. The retainer 3 is screwed onto the male screw portion 33 of the main body 30 and each tightening nut 2 is tightened until the tips of the packings 4 are pressed by the central portion of the joint main body 1 via the inner flange 12. The packing holding cylinder 31 is pushed into the tapered inner peripheral surface of the joint body 1.

When each tightening nut 2 is screwed as described above, the retainer 3 moves toward the center of the joint main body 1,
Each piece of the packing holding cylinder 31 which is separated by the slit and is in a cantilever state is gradually narrowed in the axial direction from the tip end portion by the tapered inner peripheral surface 10 of the joint body 1 and is shown on the left side of FIG. As shown in FIG. 5, each packing 4 has a tip protruding from the packing holding cylinder 31 on the inner flange.
The part that is pressed by 2 and located closer to the tip end is pressed more strongly to the peripheral surface of the flexible tube 5.
According to the flexible pipe joint of this embodiment, the degree of inclination of the tapered inner peripheral surface 10 of the joint body 1 is directly reflected in the amount of compression of the tip of the packing 4 in the pipe 5 direction.
Compared with the conventional joint of FIG. 9, when the taper inner peripheral surface 10 has the same inclination, the compression amount of the packing 4 is much larger in the joint of this embodiment. Therefore, the flexible tubes 5 can be connected to each other with higher water tightness.

The embodiment of FIG. 3 is an example in which another retainer 6 shown in FIGS. 4 and 5 is used in place of the retainer 3 described above, and the other members have the same structure as the member of the embodiment described above. Are using. The retainer 6 of this embodiment is made of synthetic resin and has a short cylindrical body 6 as shown in FIGS. 4 and 5.
0 and a packing holding cylinder 61 that is integrally formed at the tip of the main body 60 and has a smaller outer diameter and a larger inner diameter than the main body 60. Similar to the retainer 3 described above, the cylindrical main body 60 has a male screw portion 63 formed on the outer periphery thereof and a spiral guide 64 adapted to the spiral irregularities 50 of the flexible tube 5 formed on the inner periphery thereof. The packing holding cylinder 61 (FIG. 4) is composed of a plurality of packing holding pieces 62 alternately arranged in a state of forming a substantially cylindrical shape as a whole, and a plurality of connecting pieces 65 shorter than the packing holding pieces 62. Oil. Each packing holding piece 62 has a cylindrical body 60.
Is separated by a slit 67 that is intermittent in the circumferential direction, and has a tip end having an outer diameter capable of contacting a larger diameter side portion of the tapered inner peripheral surface 10 of the joint body 1 and the tapered inner peripheral surface 10. It has a tapered outer peripheral surface 66 with a substantially matching slope. Each connecting piece 65 located between the packing holding pieces 62 is integral with the cylindrical body 60, and is connected to the adjacent packing holding piece 62 via a thin knockout 68. The procedure for connecting the flexible pipes 5 to each other by the joint using the retainer of this embodiment is the same as that of the joint of the embodiment of FIGS. 1 and 2.

According to the joints of the embodiments shown in FIGS. 3 to 5, when the tightening nut 2 is screwed in the tightening direction, the retainer 6 moves toward the center of the joint body 1 and the tapered inner peripheral surface of the joint body 1. The contact between 10 and the tapered outer peripheral surface of the packing holding piece 62 causes the packing holding piece 62 to approach the flexible pipe 5 in a state of being substantially parallel to the axis, while the inner packing 4 is compressed substantially uniformly over its entire length. In the process,
Each packing holding piece 62 is cut and separated from the adjacent connecting piece 65 at the knockout 68 portion. Then, as shown on the left side of FIG. 3, the tip of the packing 4 slightly projecting from the packing holding cylinder 61 has an inner flange 1 of the joint body 1.
2 and the packing 4 is strongly pressed to the surface of the flexible pipe with a substantially uniform force over its entire length.
According to the flexible pipe joint of this embodiment, the degree of inclination of the tapered inner peripheral surface 10 of the joint body 1 is reflected as it is in the amount of compression of the packing 4 in the direction of the pipe 5 over the entire length of the packing 4. Compared to the conventional joint, when the taper inner peripheral surface 10 has the same inclination, the compression amount of the packing 4 is much larger in the joint of this embodiment. Therefore, the flexible tubes 5 can be connected to each other with higher water tightness.

In the joint according to the present invention, the tightening structure of the tightening nut 2 can be implemented as shown in FIG. In FIG. 6, a male screw portion 14 is formed on the outer circumference of both end portions of the joint body 1, while a female screw portion 22 that matches the male screw portion 14 is formed in the tip direction of the tightening nut 2, and is formed in the rear end portion of the tightening nut 2. The flange 23 is formed and is locked to the cylindrical main body 30 of the retainer 3. The other structure of the example of FIG. 6 is the same as that of the embodiment of FIGS. 1 and 2, but this tightening structure can be applied to other embodiments.

In the embodiment shown in FIGS. 3 to 5, instead of connecting each packing holding piece 62 to the adjacent connecting piece 65 via the knockout 68, as shown in FIGS. 7 and 8, each packing holding piece 62 is held. A thin hinge portion 69 is provided between the piece 62 and the connecting piece 65.
It can also be implemented by connecting by. According to the examples of FIGS. 7 and 8, in the process of tightening the tightening nut 2 of FIG. 3, when the packing holding pieces 62 approach each other in the direction of the flexible pipe 5 while being substantially parallel to the axis, the hinge portion 6
Since 9 extends, each packing holding piece 62 and each connecting piece 65 adjacent thereto are not completely separated.

In each of the above-mentioned embodiments, the inner flange 12 is formed on the joint body 1, but the inner flange 12 may be omitted. If the inner flange 12 is not provided, the tips of both packings 4 are pressed against each other when the flexible tubes 5 are connected to each other. In the joints according to the above-described embodiments, when connecting the flexible pipes 5 to each other, a non-drying sealant or a lubricant is applied to the peripheral surfaces of the pipes 5 having a certain length and the inner surface of the packing 4. You can also

[0024]

According to the first corrugated flexible pipe joint of the present invention, the packing holding cylinder formed at the tip of the cylindrical main body of each retainer has slits at predetermined angular intervals, and By having an outer diameter that can be inscribed in the larger diameter side portion of the inner tapered surface of the joint body, even if the inner tapered surface of the joint body has a large inclination, the pipe end portion Since the amount of compression of the packing in the axial direction gradually increases as it approaches, the degree of inclination of the taper inner peripheral surface can be almost faithfully reflected in the amount of compression of the packing. It is much larger than conventional fittings, which results in more watertight tube interconnections.

According to the second corrugated flexible pipe joint of the present invention, the packing holding cylinder formed at the tip of the cylindrical main body of each retainer is circumferentially formed so as to form a substantially cylindrical shape as a whole. It is composed of packing holding pieces arranged alternately and connecting pieces shorter than the packing holding pieces. Each packing holding piece is separated from the cylindrical main body, and the tips of the packing holding pieces are larger than the taper inner peripheral surface. The connecting piece has an outer diameter capable of inscribed in a portion closer to the radial side, and a tapered outer peripheral surface having an inclination substantially matching the tapered inner peripheral surface, and the connecting piece is integral with the cylindrical main body and is adjacent to the cylindrical main body. Even if the inner peripheral surface of the taper of the joint body has a large inclination, the compression amount of the packing in the axial direction can be adjusted according to the inclination by connecting it to the packing holding piece that is connected via a thin knockout or hinge. To span substantially uniformly with respect to the surface, the magnitude of the slope of the tapered inner surface can be faithfully reflected in the amount of compression of the packing. Therefore,
The amount of compression of the packing is much greater than conventional fittings, which results in more watertight tubing interconnections.

[Brief description of drawings]

FIG. 1 is a half-cut sectional view of a joint according to a first embodiment of the present invention with a part of a joint disassembled.

FIG. 2 is a half cross-sectional view showing a state where the corrugated flexible pipes are connected to each other from the state of FIG.

FIG. 3 is a half sectional view showing a state in which flexible pipes are connected to each other by a joint of an embodiment corresponding to claim 2 of the present invention.

4 is a diagram of a retainer in the joint of FIG. 3,
(A) is the front view, (B) is the half cut sectional view.

5 is a partially enlarged view of the retainer of FIG. 4 (A).

FIG. 6 is a partial cross-sectional view showing a modified example of the joint.

7A and 7B are drawings showing a modified example of the retainer in the joint of FIG. 3, in which FIG. 7C is a front view thereof, and FIG.

FIG. 8 is a partially enlarged view of the retainer of FIG. 7 (C).

FIG. 9 is a cross-sectional view of a conventional spiral corrugated pipe joint.

[Explanation of symbols] 1 Joint body 10 Tapered inner peripheral surface 11 Stopper 12 Inner flange 13 Slit 14 Male thread portion of joint body 2 Tightening nut 20,22 Female thread portion 21 Convex portion or wrench hook 23 Inner flange of fastening nut 3,6 Retainer 30,60 Cylindrical body 31,61 Packing holding cylinder 32 Slit 33,63 Male screw part 34,64 Spiral guide 4 Packing 40 Spiral convex 41 Inner edge 5 Flexible pipe with wave 50 Spiral unevenness 62 Packing holding piece 65 Connection piece 66 Taper Outer peripheral surface 67 Slit 68 Knockout 69 Hinge part a Collar b Connection part body c Tapered part cd Corrugated corrugated pipe e Spiral unevenness f Tapered outer peripheral surface g Metallic sleeve g h Cap nut i Asbestos packing j Tubular bolt part

Claims (3)

[Claims] 1. A joint for connecting corrugated flexible pipes having a peripheral wall formed in a spiral wave shape, wherein: a cylindrical joint main body having a pair of tapered inner peripheral surfaces whose diameter decreases from both end portions toward a central direction; The cylindrical body having a spiral guide corresponding to the spiral irregularities of the flexible tube on the inner periphery has slits at predetermined angular intervals, and can be inscribed on the larger diameter side portion of the taper inner peripheral surface. A pair of retainers formed with a packing holding cylinder having an outer diameter, one end rotatably locked to the outer circumference of the joint body and the other end screwed onto the outer circumference of the cylindrical body, or one end A pair of tightening nuts whose parts are screwed to the outer circumference of the joint body and whose other end is rotatably locked to the cylindrical body, and a screw corresponding to the spiral unevenness of the flexible pipe. A pair of cylindrical packings, which are housed in the packing holding cylinder in such a manner that they have irregularities on the inner circumference and the tip part of the packing holding cylinder projects slightly from the tip part of the packing holding cylinder, Flexible pipe fitting. 2. A joint for connecting corrugated flexible tubes each having a peripheral wall formed in a spiral wave shape, wherein a cylindrical joint body having a pair of tapered inner peripheral surfaces having a diameter decreasing from both end portions toward a central direction. , the tip portion of the cylindrical present having a helical guide for the helical irregularities of the flexible tube to the inner circumference, and overall packing holding pieces are arranged alternately in a state of forming a substantially cylindrical from the packing holding pieces is formed a short connecting piece consisting of a packing holding cylinder, the packing holding piece, and the cylindrical body are separated, the outer tip portions mutually be inscribed into the larger diameter portion near the tapered inner surface The connecting piece has a diameter and a tapered outer peripheral surface having an inclination that substantially matches the inner peripheral surface of the taper, and the connecting piece is a thin knockout with the packing holding piece that is integral with the cylindrical main body and is adjacent to the cylindrical main body. A pair of retainers connected via hinges, one end of which is rotatably locked to the outer circumference of the joint body and the other end of which is screwed onto the outer circumference of the cylindrical body, or one end of which is Has a pair of tightening nuts screwed to the outer circumference of the joint body and the other end of which is rotatably locked to the cylindrical body, and spiral concavity and convexity corresponding to the spiral concavity and convexity of the flexible pipe on the inner circumference. And a pair of cylindrical packings housed in the packing holding cylinder in a state where the tip part thereof projects slightly from the tip end of the packing holding cylinder, and a corrugated flexible pipe joint. 3. The corrugated flexible pipe joint according to claim 1, wherein the joint body has an inner flange on an inner circumference of a central portion.