JPH0680315U - Pipe fitting for corrugated pipe - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a corrugated pipe connection structure having high watertightness, high pull-out strength of the corrugated pipe, and good workability. [Structure] The corrugated pipe connection structure 11 includes a main body 16, packing 18,
It is a combination of a holder 19 and a collar 20. The packing 18 has a circular outer peripheral cross section, and has a through hole in which a corrugation 26 substantially the same as the corrugated pipes 14 and 15 is formed on the hole wall surface. The holder 19 has a columnar shape and has a through hole provided with a hooking portion 30 for the corrugated tube at an appropriate position. The main body 16 is a cylindrical body having an annular portion 17 at the center, and packings 18 on both sides of the annular portion,
Further, the holders 19 are respectively housed outside them. Color
Reference numeral 20 denotes an end face wall 42 having an opening larger than the outer diameters of the corrugated pipes 14 and 15 in the center at one end face, and the main body near the other end face.
It consists of a cylindrical body 40 having a can-joining portion 44 with 16. The outer surface of the holder 19 is the inner surface of the main body 16 so that the holder 1
9 is the packing 18 of the main body 16 when entering the main body 16,
It is guided along the central axis of the portion that houses the holder 19.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connecting structure for connecting in the longitudinal direction a corrugated pipe in which a spiral corrugation is formed in the longitudinal direction. More specifically, the connecting portion of the corrugated pipe can be sealed in a watertight manner. It relates to a corrugated pipe connection structure that has good workability and has a high pull-out strength of the connected corrugated pipe.

[0002]

[Prior art]

 The spiral corrugated pipe refers to a pipe having a spiral corrugation formed on the outer surface, and is generally a flexible synthetic resin pipe having a spiral corrugation. The spiral corrugated pipe (hereinafter simply referred to as corrugated pipe for simplicity) is a protection that protects these wires or pipes when they are buried in the ground such as electric wires, cables, or pipes such as pipes. It is often used as a pipe.

The corrugated pipe is usually rolled and then shipped from the factory for the convenience of transportation or the like, or it is cut into a predetermined length and shipped from the factory. . When burying wires, cables, etc. in the ground over a long section, it is necessary to connect the corrugated pipes in the longitudinal direction according to the length at the construction site.

When connecting a corrugated pipe at a construction site, conventionally, the corrugated pipe has been typically connected by a connecting means as shown in FIG.

(Prior Art 1) In the corrugated pipe connecting means shown in FIG. 10, a corrugated sleeve joint A having a waveform substantially similar to the waveforms 13 and 13 'of the corrugated pipes 14 and 15 to be connected is used. Prepare and screw this corrugated sleeve joint A into one corrugated pipe 14 end, then bring the corrugated pipes 14 and 15 into contact with each other, and then return the corrugated sleeve joint A. Screw it on so that it spans over both ends.

Next, in order to prevent the corrugated pipes 14 and 15 from pulling out from the corrugated sleeve joint A, and to seal the space between the corrugated pipes 14 and 15 and the corrugated sleeve joint A in a watertight manner, Corrugated Several types of tapes B, C and D are wound around the overlapping portions of the corrugated sleeve joint A and the corrugated pipes 14 and 15.

In order to press and wind, first, a press winding with a relatively narrow width is performed with an adhesive sealing tape B made of unvulcanized rubber, and then a press winding with a wide rubber tape C is performed from above.

Then, both end portions of the portion wound with the rubber tape C are pressed and wound with a vinyl chloride tape D from above.

As described above, it is easy to overlap and wind the wound sleeve joint A even if it is damaged by an external force by ensuring the watertightness of the corrugated sleeve joint A and laminating different kinds of tape. This is to prevent the tape seal from breaking.

Conventional Example 2 The connection structure shown in FIG. 11 is a structure proposed in Japanese Utility Model Laid-Open No. 62-54390. In this connection structure, a packing 118 is attached to the pipe 14, the packing 118 is inserted into the main body 116, and the collar 120 is screwed to the main body 116 for connection.

[0011]

[Problems to be solved by the device]

 (Problem of Conventional Example 1) Since the corrugated pipes 14 and 15 have flexibility, they can be wound around and are suitable for laying a long length. The curl is left on the terminal. Due to the winding of the corrugated pipe, the corrugated sleeve joint A must be made a waveform larger than the corrugated pipes 14 and 15 (the pitch is equal and the wave height is small). It's difficult to get into 15. In the case of using the corrugated sleeve joint A having such a large waveform, the following problems have occurred.

First, at the overlapping portion of the corrugated pipes 14 and 15 and both ends of the corrugated sleeve joint A, the waveform of the corrugated sleeve joint A is larger than that of the corrugated pipes 14 and 15. Therefore, in any case, a gap is formed between the corrugated pipes 14 and 15 and the corrugated sleeve joint A, and it is actually extremely difficult to press and wind with a tape so as to completely close the gap.

Further, when the corrugated pipe is buried in the ground, the surface of the corrugated pipe is often wet with water and oil, and is often soiled with mud. It was more and more difficult to press the sleeve joint with the attachment so that the sleeve was completely attached to the sleeve joint.

As described above, in sealing with a tape, it is difficult to adhere the tape to each other, so that the watertightness is poor, the workability is poor, and the corrugated pipe has a small pull-out strength. It was often separated.

The second problem is that since the tape is generally weak against mechanical external force and is exposed to the outside of the corrugated pipe, it is damaged by earth and sand when backfilling after connecting the corrugated pipe. Was often received. Moreover, when the temperature rises, the sealing tape B tends to sag, lose its shape, and even flow out. Therefore, when the corrugated pipe is connected by the conventional connecting means in the deep underground underground where the temperature is relatively high, the sealing tape B may flow out due to the high temperature and flow into the corrugated pipe to destroy the connection structure. There was also.

In addition, construction sites where corrugated pipes are connected often have narrow working areas such as trenches or holes dug in the ground, or tunnels dug in the ground, and there is no space available for tape winding work. There was also a fundamental problem that it was often difficult to wind the tape itself because it was limited.

(Problem of Conventional Example 2) Further, in the connection structure of FIG. 11, when the collar 120 is tightened in a bad posture such that the main body 116 and the pipe 14 are inclined, the packing 118 is slanted into the main body 116. In many cases, it was locked in such a state that there was a complaint that a highly watertight connection could not be made reliably.

In order to compress and press the packing 118, the end surface of the pankin 118 is projected from the end of the main body 116. For this reason, a gap 121 is created between the main body 116 and the collar 120. Since the packing 118 is deformed toward the gap 121, the tightening force applied to the packing 118 is reduced, and the watertightness cannot be sufficiently improved.

In view of the above problems, an object of the present invention is to provide a corrugated pipe connection structure having high watertightness, high drawing strength, and good workability.

[0020]

[Means for solving the problem]

 The present inventor, in view of the work environment at the construction site where the corrugated pipe is connected, improves the watertightness, workability and pull-out strength of the connection structure by replacing the conventional combination of the corrugated sleeve joint and the tape. We thought that it was important to adopt a structure and came to complete the present invention.

The corrugated pipe connection structure according to the present invention is provided with a packing having an inner surface that is in close contact with the outside of the corrugated pipe, and a hooking portion that engages with a trough of the wave diameter of the corrugated pipe. A holder in the wall and an annular portion projecting inward in the radial direction are provided in the center of the cylinder, packing is provided on both sides of the annular portion, and a holder is housed outside the packing. It comprises a collar which has an end wall having an opening with a diameter larger than the maximum outer diameter in the center and can be locked to the main body, and accommodates the packing of the main body and the holder in the direction of entry of the holder into the main body. It is characterized in that it is guided by the outer surface of the holder and the inner surface of the main body along the longitudinal centerline of the part.

The corrugated pipe connection structure of the present invention is a connection structure for longitudinally connecting a corrugated pipe having a spiral corrugation formed on the outer surface thereof, and the corrugated pipe has a spiral outer shape. As long as it is corrugated, it can be applied to all spiral corrugated tubes. That is, the inner surface may have a smooth shape regardless of the shape of the corrugation and the material of the corrugated tube.

The pipes connected by the corrugated pipe connection structure of the present invention may be corrugated pipes, but may be corrugated pipes and smooth pipes or other members. When connecting corrugated tubes, they may have different diameters.

The inner diameter of the cylindrical body forming the main body may be of a size capable of accommodating the packing and the holder, but in order to improve the sealing property, it is brought into close contact with the outer peripheral surface of the packing as described later. Is desirable. The inner diameter of the annular part of the main body should be the same as or slightly larger than the inner diameter of the corrugated pipe to be connected so as not to hinder the passage of wires, cables, etc. in the corrugated pipe.

The locking means between the collar and the main body is, for example, a screw connection, a connection between the protrusion and the spiral groove, or a pin which penetrates the main body from the collar is commonly used. From the point of view, locking by screw connection is preferable.

The inner surface of the packing used in the present invention needs to be substantially the same as the outer surface of the corrugated pipe. Substantially the same means that the outer corrugated shape of the corrugated pipe is almost the same. Further, in order to improve the sealing performance, it is desirable that the outer peripheral surface of the packing is tapered so that its diameter decreases toward the tip, the inner peripheral surface of the main body is matched with the shape of the outer peripheral surface of the packing, and the relative dimension thereof is the same as that of the packing. It is recommended that the size be slightly smaller than the outer peripheral surface. The packing is used with the end surface of the smaller outer diameter being the center side of the main body. In addition, it is preferable that the length of the corrugated through hole, that is, the width of the packing, is set to a dimension of the packing that is longer than one pitch length of the spiral corrugated pipe of the corrugated pipe. The packing is not particularly limited as long as it exhibits waterproofness, but is usually preferably a resin or rubber material having a shear hardness HS in the range of 20 to 60. The material of the packing is not particularly limited, but from the viewpoint of durability, vulcanized rubber is preferable, but water-expandable rubber may be used.

The holder used in the present invention is formed such that the outer surface of the holder is guided by the inner surface of the body along the central axis of the part of the holder that accommodates the packing and the holder. Has been done. The shape of the holder is preferably cylindrical, and its outer diameter is slightly smaller than the inner surface of the holder accommodating portion of the main body. In this case, it is desirable that the holder has the same diameter on both end surfaces or is shaped so as to be inclined more gently than the outer surface of the packing. A guide projection or groove may be provided on the outer surface of the holder. In this case, grooves or protrusions are provided at corresponding positions on the inner surface of the main body.

In order to obtain a sufficiently large pull-out strength, the length of the holder is preferably longer than one pitch of the corrugated pipe, and the hooking portion is provided all around the inner surface or at least two. The above shall be provided inside the appropriate places. The shape of the latch is not particularly limited.

The material of the holder, collar and joint body is not particularly limited, but is preferably hard plastic from the viewpoint of corrosion resistance and workability.

[0030]

[Action]

 The connection structure of the corrugated pipe of the present invention is such that the holder and the packing are pushed into the inner part of the main body by tightening with the collar, the end face of the packing is the surface of the stopper part of the main body, the inner surface is the outer surface of the corrugated pipe, and Press the outer peripheral surface of the packing against the inner wall surface of the main body. As a result, a completely watertight seal can be achieved.

In addition, in the corrugated pipe connection structure of the present invention, the holder locks the corrugated pipe, and the collar tightens the holder to firmly connect the corrugated pipes through the main body. Therefore, the corrugated pipe is loosened and the corrugated pipe is prevented from coming off from the corrugated pipe connection structure.

In the connection structure of the present invention, the holder is guided by the inner surface of the main body so as to enter the main body along substantially the central axis direction. It is pushed straight into the body. Therefore, even when the connection work has to be performed in a bad posture in which the main body and the corrugated pipe are tilted, the connection with good water tightness can be surely made.

In addition, in the connection structure of the present invention, since the packing can be completely accommodated in the main body by providing the holder, the tightening force applied to the packing can be efficiently used for the crimping force with the main body. It can be converted to obtain a high degree of water tightness.

[0034]

【Example】

 Hereinafter, the present invention will be described in more detail based on embodiments with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional side view showing a state (Example 1) in which two spiral corrugated pipes are connected using an embodiment of the corrugated pipe connection structure according to the present invention. FIG. 2 is a portion showing a state in which the corrugated pipe connection structure according to the present invention is used to connect a corrugated pipe having a spiral corrugation to a pipe such as a PVC pipe or a metal pipe whose outer surface is smooth. It is a sectional side view. 3, 4, 5, and 6 are views showing a packing, a holder, a collar, and a main body, respectively.

Example 1 A corrugated pipe connection structure 11 shown in FIG. 1 is for connecting in the longitudinal direction corrugated pipes 14 and 15 in which helical corrugations 13 and 13 ′ are formed in the longitudinal direction. It is a connection structure. The corrugated pipe connection structure 11 is, as shown in FIG. 6, a main body 16 having an annular stopper portion 17 in the center, and both sides of the stopper portion 17 in the main body 16, which are to be mounted respectively, as shown in FIG. Two packings 18 and 18 ', two holders 19 and 19' as shown in FIG. 4, which should be mounted on both sides of the packings 18, respectively, are screwed into the outer sides of both ends of the main body 16 and tightened, as shown in FIG. It is a combination of parts consisting of two collars 20 and 20 'as shown in.

As shown in FIG. 3, the packing 18 has a shear hardness HS that is formed in a truncated cone shape in which the outer diameter of one end surface 22 is smaller than the outer diameter of the other end surface 24 and the outer circumference is a tapered surface 23. There are 30 vulcanized rubber products. Both end faces 22 and 24 thereof are parallel to each other and are orthogonal to the center line in the longitudinal direction, and the end face 22 on the smaller outer diameter side is smooth in order to improve adhesion with the stopper portion 17 of the main body 16 described later. The surface is finished.

The width of the packing 18 is substantially equal to one pitch length of the spiral corrugations 13, 13 ′ (see FIG. 1) of the corrugated pipes 14, 15 and the corrugated pipes 14, 15 along the center line of the truncated cone. There is a through hole through which the spiral corrugations 26, 26 of the length corresponding to the spiral wave shape 13, 13 'of the corrugated pipes 14, 15 and corresponding to one pitch length are formed on the wall surface of the through hole. 'Is formed.

In FIG. 4, the holder 19 is formed in a cylindrical shape having an outer diameter that is the same as or slightly smaller than the outer diameter of the end surface 24 of the packing 18 having the larger outer diameter, and accommodates the holder 19 of the main body 16. The outer diameter is approximately equal to or slightly smaller than the inner diameter of the portion to be filled. The holder 19 is made of hard plastic, and the length thereof is set to be approximately equal to one pitch length of the spiral corrugations 13, 13 '(see FIG. 1) of the corrugated pipes 14, 15. The holder 19 has both end surfaces 28, 28 parallel to each other and orthogonal to the center line of the cylinder in the longitudinal direction, and a through hole for passing the corrugated tube is provided along the center line of the cylinder.

On the wall surface of the through hole, latching portions 30, 30 ′ that can be screwed into the spiral corrugations 13, 13 ′ of the corrugated pipes 14, 15 are provided at three locations at equal intervals in the circumferential direction. It is provided in. These hook portions 30, 30, 30 are provided in the lengthwise direction of the holder 19 at substantially the same pitch as the spiral corrugations 13, 13 'of the corrugated pipes 14, 15. In order to improve the insertability of the corrugated pipe, as shown in FIG. 1, the heights of the hooking portions 30, 30 'of the through holes of the holder 19 are set so that the corrugated pipes 13, 15 have the spiral waveforms 13, 13'. It is smaller than the depth of the valley.

As shown in FIGS. 1 and 6, the main body 16 is a substantially cylindrical hard plastic part having a thick wall portion 32 having a large wall thickness in the center for reasons of strength. An annular stopper portion 17 that extends in the radial direction is provided inside the thick portion 32, and a thread 34 that is screwed into a thread 44 of a collar 20 described below is provided at both ends of the main body 16. is there.

After connecting the corrugated pipes 14 and 15, the inner diameter of the stopper portion 17 is set to the end surface of the corrugated pipes 14 and 15 so as not to interfere with the passage of electric wires, cables, etc. in the corrugated pipes. It is set to be slightly larger than the inner diameter of. The corrugated pipes 14 and 15 are connected by the corrugated pipe connection structure 11 of the present embodiment, and the surfaces on both sides of the stopper portion 17 are in close contact with the end faces 22 and 22 of the packings 18 and 18 'having small diameters, respectively. Therefore, the surfaces on both sides of the stopper portion 17 are orthogonal to the longitudinal centerline of the main body 16, and are finished to be smooth surfaces to improve the adhesion with the end surface 22 of the packing 18.

On both sides of the stopper portion 17, there is a wall surface similar to the contour of the tapered outer peripheral surface 23 of the packing 18 and having a relative inner diameter dimension slightly smaller than the tapered surface 23. A packing accommodating portion 36 for accommodating and a holder accommodating portion 38 for accommodating the holder 19 which is a cylindrical hole having an inner diameter slightly larger than the outer diameter of the holder 19 are provided further outside thereof.

The packing accommodating portion 36 is largely inclined in the longitudinal direction, but the holder accommodating portion 38 is flat or has a minimum inclination necessary for molding.

The length from the contact surface of the stopper portion 17 with the packing 18 to the end surface of the main body 16 is slightly shorter than the sum of the lengths of the packing 18 and the holder 19 in the longitudinal direction. If the length from the contact surface of the stopper 17 to the packing 18 to the end surface of the main body 16 is longer than the sum of the lengths of the packing 18 and the holder 19 in the longitudinal direction, the tightening effect of the collar 20 described later is reduced. Because it is done.

As shown in FIGS. 1 and 5, the collar 20 is a hard plastic component including a cylindrical portion 40 and an end portion 42. The collar 20 is screw-fitted to the main body 16 at the cylindrical portion 40. The end wall 42 has an opening 43 having a diameter larger than the maximum outer diameter of the corrugated pipes 14, 15 or the diameter of the peaks of the corrugated pipes 13, 13 'for passing the corrugated pipes 14, 15. The collar 20 is strong enough to fasten the packing 18 and the holder 19.

Next, with reference to FIG. 1, a procedure for connecting the corrugated pipes 14 and 15 using the corrugated pipe connection structure 11 of the present embodiment will be described.

First, the collar 20 is passed through the corrugated tube 14. At this time, the cylindrical portion 40 of the collar 20 is positioned on the end side of the corrugated pipe 14. Then, the holder 19 is screwed into the corrugated pipe 14 and attached to the corrugated pipe 14 so that the holder 19 is positioned near the end of the corrugated pipe 14. Next, the packing 18 is screwed into the corrugated tube 14 so that the end surface 22 of the packing 18 is aligned with the end surface of the corrugated tube 14. At this time, the end surface 22 having a small outer diameter is set to the end portion side of the corrugated pipe 14. Then, the holder 19 is brought into contact with the other end surface of the packing 18.

The collar 20 ', the holder 19', and the packing 18 'are also attached to the other corrugated tube 15 in the same manner as described above.

Next, the corrugated tube 14 covered with the holder 19 and the packing 18 is covered with the right side portion of the main body 16 and pushed in until the stopper portion 17 comes into contact with the end surface of the corrugated tube 14. Similarly, the other corrugated pipe 15 covered with the holder 19 'and the packing 18' is also covered with the left side portion of the main body 16 and pushed in until the stopper portion 17 comes into contact with the end face of the corrugated pipe 15.

Next, the two collars 20 and 20 ′ are screwed into both ends of the body 16 and the holders 19 and 19 ′ are pushed into the inside of the body 16.

As a result, the holder 19 pushes the packing 18 straight into the main body 16, and as shown in FIG. 1, the end face 22 is the surface of the stopper portion 15 and the corrugated 26 is the outer surface of the corrugated pipes 14, 15. Further, the taper surface 23 can be crimped to the inner wall surface of the main body 16 on the corrugated portions 13 and 13 ', and can be completely watertightly sealed.

As described above, after the packing 18 is once brought into close contact with water, even if water enters the end surface 24 of the packing 18 by applying water pressure through the gap between the collar 20 and the main body 16, the direction in which the water pressure acts is Since the direction in which 18 is further closely attached to the main body 16 and the corrugated pipes 14 and 15, high water-tightness can be obtained even if the tightening by the color 20 is initially loose.

In addition, in the corrugated pipe connection structure 11 of the present embodiment, the hooking portions 30, 30 ′ of the holder 19 lock the corrugated pipes 13, 13 ′ of the corrugated pipes 14, 15 to fix the holder 19 to the holder 19. Since the collar 20 is tightened, the ability to prevent the corrugated pipes 14 and 15 from coming off from the corrugated pipe connection structure 11 is very large.

The corrugated pipe connection structure 11 of the present embodiment uses only a few molded parts, that is, the packing 18, the holder 19, the collar 20, and the main body 16 to connect the corrugated pipes 14 and 15, Since it can be completed by just sprinkling work, no skill is required for the work. In addition, the workability is high because there is no tape pressing and winding work that requires experience and has poor workability.

Further, the main body 16 used in the corrugated pipe connection structure 11 of the present embodiment can be made to have a short structure, while the packing 18 can be made thicker, so that the conventional corrugated pipe shown in FIG. Unlike the leave joint A, even if there is a wrap around the ends of the corrugated pipes 14 and 15, those parts can be screwed into the corrugated pipes 14 and 15 without difficulty.

Further, in this connecting structure, the holder 19 is guided by the inner surface of the main body 16 so as to enter substantially along the central axis direction. Therefore, at the time of the connecting work, the packing 18 housed in the main body 16 is held by the holder. It is pushed straight into the body 16 by 19. Therefore, even when the connection work must be performed in a bad posture in which the main body 16 and the corrugated pipes 14 and 15 are inclined, the water-tight connection can be reliably performed.

In addition, in this connection structure, since the packing 18 can be completely accommodated in the main body 16 by providing the holder 19, the tightening force applied to the packing 18 can be efficiently applied to the main body 16. It can be converted to crimping force to obtain a high degree of watertightness.

Example 2 FIG. 2 is a diagram showing a second example of the corrugated pipe connection structure. This corrugated pipe connecting structure 12 is a connecting structure for longitudinally connecting a corrugated pipe 14 in which a spiral corrugation 13 is formed in the longitudinal direction and an external smoothing pipe. The connection structure on the side of is replaced by a connection part 70 with the outer surface smooth tube.

Example 3 FIG. 7 shows a packing 50 which is a modified example 1 of the packing 18. FIG. 7 (a) is a front view of a half body of the packing 50, and FIG. 7 (b) is FIG. 6 is a side view, partially in section, of packing 50. The packing 50 has a circular truncated cone shape like the packing 18, but has an annular convex portion 54 having an opening diameter substantially equal to the inner diameters of the corrugated pipes 14 and 15 on an end surface 52 having a small diameter.

When the packing 50 is screwed into the corrugated pipes 14 and 15, the packing 50 stops when the end faces of the corrugated pipes 14 and 15 contact the annular convex portion 54. Therefore, when tightened with the collar 20, the small-diameter end surface 52 of the packing 50 surely comes into close contact with the stopper portion 17 of the main body 16 to ensure watertightness.

Example 4 FIG. 8 shows a color 60 which is a modification of the color 20. FIG. 8A is a front view of a half body of the color 60, and FIG. It is a partial cross-sectional side view of 60. The collar 60 has a non-slip protrusion 62 at an appropriate position on the outer periphery for convenience of gripping the outer periphery when the collar 60 is screwed into the end of the main body 16.

Example 5 FIG. 9 shows a joint body 80 which is a modified example of the body 16. FIG. 9 (a) is a front view of a half body of the body 80, and FIG. 9 (b) is FIG. 10 is a partial cross-sectional side view of the joint body 80 shown in FIG. 9 (a). The main body 80 has a non-slip protrusion 62 at an appropriate position on the outer periphery for the convenience of gripping the outer periphery when the collar 20 is screwed into the end of the main body 80.

The configuration and operation of the corrugated pipe connection structure 11 of the present embodiment have been described above on the assumption that the corrugated pipes 14 and 15 are the same corrugated pipe having the same dimensions and the same corrugated shape. However, by matching the size and shape of each part of the corrugated pipe connection structure 11, especially the packing waveform and the shape of the retaining part of the holder to the waveform of each corrugated pipe to be connected, the pipe diameter may differ slightly. Further, corrugated tubes having slightly different waveforms can be connected to each other.

[0064]

[Effect of device]

 In the corrugated pipe connection structure of the present invention, the holder pushes the packing into the inside of the main body by tightening with the collar, and the end face of the packing penetrates the stopper part surface of the main body in cooperation with the wall of the main body. The connection portion of the corrugated pipe can be water-tightly sealed by press-contacting the corrugated surface of the hole with the corrugated surface of the corrugated pipe and further contacting the outer peripheral surface thereof with the inner wall surface of the main body.

In the corrugated pipe connection structure of the present invention, the holder locks the corrugated pipe and the collar tightens the holder in the main body, so that the corrugated pipe is pulled out from the corrugated pipe connection structure. It is highly resistant to the power to do.

The corrugated pipe connection structure of the present invention can connect the corrugated pipe by using not the tape-sealed structure but the combined parts composed of the already molded comparatively thick packing and the short body. Since it is possible, workability in the field is high, and it is easy to install even on a corrugated pipe with a curl, and no skill is required.

In the connection structure of the present invention, the holder is guided by the inner surface of the main body so as to enter substantially along the central axis direction. Therefore, at the time of connection work, the packing accommodated in the main body is inserted into the main body by the holder. It is pushed straight in. Therefore, even when the main body and the corrugated pipe have to be connected in an unfavorable posture, the water-tight connection can be surely made.

In addition, in the connection structure of the present invention, since the packing can be completely housed in the main body by providing the holder, the tightening force applied to the packing can be efficiently used for the crimping force with the main body. It can be converted to obtain a high degree of water tightness.

[Submission date] April 19, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content] [Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint for longitudinally connecting a corrugated pipe with a spiral corrugation formed in the longitudinal direction, and more specifically, it can seal the corrugated pipe connection portion in a watertight manner, thereby improving workability. The present invention relates to a pipe joint that provides a connection portion of a corrugated pipe that has good drawing strength and has a high drawing strength of the connected corrugated pipe.

[0002]

[Prior art]

 The spiral corrugated pipe means a pipe having a spiral corrugation formed on the outer surface, and is generally a flexible synthetic resin pipe having a spiral corrugation. Spiral corrugated pipes (hereinafter simply referred to as corrugated pipes for simplicity) are wire rods or pipes that are embedded in the corrugated pipe when wires, cables, etc. or pipes such as pipes are buried in the ground. Often used as a protective tube to protect them by accommodating them.

The corrugated pipe is usually rolled and then shipped from the factory for the convenience of transportation or the like, or it is cut into a predetermined length and shipped from the factory. It When burying electric wires, cables, etc. in the ground over a long section, it is necessary to connect the corrugated pipes of a predetermined length or other connected objects in the longitudinal direction according to the length at the construction site.

When connecting a corrugated pipe at a construction site, conventionally, the corrugated pipe has been typically connected by a connecting means as shown in FIG.

(Prior Art Example 1) In the corrugated pipe connecting means shown in FIG. 10, a corrugated sleeve joint A having a waveform substantially similar to the corrugated pipes 13 and 13 'of the corrugated pipes 14 and 15 to be connected is used. Prepare and screw this corrugated sleeve joint A into the end of one corrugated pipe 14, then contact the ends of both corrugated pipes 14 and 15 with each other, and then corrugate the corrugated sleeve joint A. Turn it back in the direction of tube 15 and screw it over both ends.

Next, in order to prevent the corrugated pipes 14 and 15 from pulling out from the corrugated sleeve joint A, and to seal the space between the corrugated pipes 14 and 15 and the corrugated sleeve joint A in a watertight manner, Corrugation Several types of tapes B, C and D are wound around the ends of the corrugated sleeve joint A and the overlapping portions of the corrugated pipes 14 and 15.

In order to press and wind, first, a press winding with a relatively narrow width is performed with an adhesive sealing tape B made of unvulcanized rubber, and then a press winding with a wide rubber tape C is performed from above.

Then, both end portions of the portion wound with the rubber tape C are pressed and wound with a vinyl chloride tape D from above.

As described above, it is easy to overlap and wind the wound sleeve joint A even if it is damaged by an external force by ensuring the watertightness of the corrugated sleeve joint A and laminating different kinds of tape. This is to prevent the tape seal from breaking.

Conventional Example 2 The connection structure shown in FIG. 11 is a structure proposed in Japanese Utility Model Laid-Open No. 62-54390. In this connection structure, a packing 118 is attached to the pipe 14, this is inserted into the main body 116, and the collar 120 is connected to the main body 116 by screwing.

[0011]

[Problems to be solved by the device]

 (Problem of Conventional Example 1) Since the corrugated pipes 14 and 15 have flexibility, they can be wound around and are suitable for laying a long length. A curled curl remains on the terminal. Because of the winding of the corrugated pipe, the corrugated sleeve joint A must be made into a waveform larger than the corrugated pipes 14 and 15 (equal in pitch and low in wave height). ， 15 is difficult to screw. When the sleeve joint A with a wave having such a large waveform is used, the following problems occur.

First, at the overlapping portion of the corrugated pipes 14 and 15 and both ends of the corrugated sleeve joint A, the waveform of the corrugated sleeve joint A is larger than that of the corrugated pipes 14 and 15. Therefore, in any case, a gap is formed between the corrugated pipes 14 and 15 and the corrugated sleeve joint A, and it is actually extremely difficult to press and wind with a tape so as to completely close the gap.

Further, when the corrugated pipe is buried in the ground, the surface of the corrugated pipe is often wet with water and oil, and is often soiled with mud. It was more and more difficult to press the sleeve joint with the attachment so that the sleeve was completely attached to the sleeve joint.

As described above, in sealing with a tape, it is difficult to adhere the tape to each other, so that the watertightness is poor, the workability is poor, and the corrugated pipe has a small pull-out strength. It was often separated.

The second problem is that the tape is generally weak against mechanical external force and is exposed to the outside of the corrugated pipe. Therefore, after connecting the corrugated pipe, the sand is put on the tape and buried. When returning, it was often damaged by the addition of sediment. Further, when the temperature of the connecting portion becomes high, the sealing tape B tends to soften, lose its shape, and further melt and flow out. Therefore, when the corrugated pipe is connected by the conventional connecting means in a deep underground burying place where the temperature is relatively high, the sealing tape B melted and flowed out due to the high temperature flows into the corrugated pipe and the connection structure is destroyed. There was also a danger.

In addition, construction sites where corrugated pipes are connected often have narrow working areas such as trenches or holes dug in the ground, or tunnels dug in the ground, and there is no space available for tape winding work. There was also a fundamental problem that it was often difficult to wind the tape around the corrugated pipe connection because of the limited space.

(Problem of Conventional Example 2) Further, in the connection structure of FIG. 11, when the collar 120 is tightened in a bad posture such that the main body 116 and the pipe 14 are inclined, the packing 118 enters the main body 116 at an angle. In many cases, it was locked in the locked state, and I was dissatisfied with the fact that a highly watertight connection could not be reliably made.

Further, in order to compress and press the packing 118, the end surface of the packing 118 is projected from the end portion of the main body 116. Therefore, a gap 121 is formed between the main body 116 and the collar 120. Since the packing 118 is deformed toward the gap 121, the tightening force applied to the packing 118 is reduced, and the watertightness cannot be sufficiently improved.

In view of the above problems, an object of the present invention is to provide a pipe joint for a corrugated pipe, which has high watertightness, high drawing strength, and good workability.

[0020]

[Means for solving the problem]

 The present inventor, in view of the working environment of the construction site where the corrugated pipe is connected, improves the water-tightness, workability, and pull-out strength of the connection portion by replacing the conventional corrugated sleeve joint and tape connection. We thought that it was important to adopt a section and came to complete the present invention.

The pipe joint according to the present invention comprises (a) a tubular body (16) into which the connecting end of the spiral corrugated pipe is inserted and held, and (b) an inside of the tubular body (16). A packing (18) provided in a space between the connection end of the corrugated pipe and the periphery of the outer surface, and (c) provided inside the tubular body (16) and adjacent to the packing (18) A holder (19); and (d) a collar (20) provided at one end of the tubular body (16) and fixing and fastening the tubular body (16) and the spiral corrugated tube. It is characterized by.

It is desirable to provide an annular stopper portion (17) protruding in the radial direction inside the cylindrical body (16). The inner diameter of this stopper should be the same as or slightly larger than the inner diameter of the corrugated pipe to be connected so that it does not hinder the passage of wires, cables, etc. through the corrugated pipe.

The inner diameter of the cylindrical body may be of a size that can accommodate the packing and the holder, but in order to improve the sealing property, it is desirable that the cylindrical body is brought into close contact with the outer peripheral surface of the packing as described later. .

The inner peripheral surface of the tubular body (16) is inclined so that the inner diameter of the tubular body (16) gradually decreases from the end surface of the tubular body (16) toward the center thereof. Is desirable. On the inner peripheral surface of the tubular body (16), it is desirable that the inclination of the portion where the holder (19) is accommodated is gentler than the inclination of the portion where the packing (18) is accommodated. More preferably, the inner peripheral surface of the tubular body (16) has a constant inner diameter from the end surface to the portion where the holder (19) is accommodated, and the packing (18 ) Is accommodated, it is formed so that the inner diameter of the cylindrical body (16) is gradually reduced toward the center.

It is desirable that the holder (19) has a hooking portion (30) on its inner peripheral surface that is engaged with the valley portion of the corrugated pipe. This hooking portion is provided over the entire circumference of the inner surface, or at least two hooks are provided at appropriate positions on the inner surface. The shape of the latch is not limited. By providing the hooking portion in this way, the connection portion of the corrugated pipe formed by the pipe joint of the present invention can have a sufficiently large drawing strength. The connection part formed in this way has the holder locked to the corrugated shape of the corrugated pipe, and the collar tightens the holder to form a strong connection through the tubular body. The loose connection prevents the corrugated pipe from coming off the pipe joint. The length of the holder (19) in the axial direction is preferably one pitch length or more of the outer spiral corrugation of the corrugated tube. With such a length, as will be described later, the effect of the guide by the holder is exhibited more reliably. Even if the hooking portion (30) is provided as described above, the center of the through hole provided in the holder and the center of the outer peripheral surface are aligned, so that the pipe, the holder, and the tubular body are aligned in the circumferential positional relationship. It has the advantage of eliminating the need. The shape of the holder is preferably cylindrical, and the outer diameter of the holder is slightly smaller than the inner surface of the cylindrical holder housing portion. In this case, it is desirable that the holder has the same diameter on both end faces or has a shape such that the outer peripheral face is inclined more gently than the outer peripheral face of the packing. Comparing the radial movements of the packing and the holder in the tubular body, the holder side with the outer peripheral surface as described above is more regulated on the holder side than the packing. There is an advantage that the effect of the guide by the rotating holder is exhibited more reliably. The outer surface of the holder may be provided with protrusions or grooves for positioning or guiding. In this case, grooves or protrusions are provided at corresponding positions on the inner surface of the tubular body.

The length of the packing (18) in the axial direction is preferably one pitch length or more of the outer spiral corrugation of the corrugated pipe. With such a length, the center of the through-hole provided in the packing and the center of the outer peripheral surface coincide with each other, and there is an advantage that it is not necessary to match the positional relationship between the tube and the packing, and the tubular body in the circumferential direction.

Further, the packing (18) is desired to have a spiral corrugated portion (26) which corresponds to the outer spiral corrugation of the corrugated pipe, and more preferably coincides with the outer spiral corrugation of the corrugated pipe. Good Further, in order to improve the sealing property, it is desirable to taper the outer peripheral surface of the packing so that the outer diameter of the packing gradually decreases from one end to the other end. In this case, match the taper of the outer peripheral surface of the packing (18) with the taper of the inner peripheral surface of the tubular body (16), and further determine the relative size of the inner peripheral surface of the tubular body (16) from the outer peripheral surface of the packing. It is better to set it slightly smaller. Such a tapered packing is used with the end face with the smaller outer diameter being the connecting end side of the corrugated pipe. The material of the packing is not limited as long as the waterproof property is exhibited, but a resin or rubber material having a Shore hardness HS in the range of 20 to 60 is desirable. From the viewpoint of durability, vulcanized rubber is preferable, but water-expandable rubber may be used.

From the viewpoint of reliability and workability, it is desirable that the collar (20) be screwed to the tubular body (16), but the present invention is not limited to this. For example, as a means for locking the collar and the tubular body, it is possible to employ a conventional means such as coupling of the protrusion and the spiral groove, and inserting a pin penetrating the collar to the tubular body.

The material of the holder, the collar and the tubular joint body is not particularly limited, but is preferably hard plastic from the viewpoint of corrosion resistance and workability.

The pipe joint of the present invention is a joint for longitudinally connecting corrugated pipes having corrugated spirals formed on the outer surface or corrugated pipes and other connected parts, or corrugated at one end side. Applicable to all spiral corrugated pipes as long as it is a joint with a connecting structure for pipes and the other end is another structure such as a box, and the outer shape of the target corrugated pipe is spiral corrugated. it can. Irrespective of the corrugated shape of the corrugated tube and the material of the corrugated tube, the inner surface shape may be smooth. The pipes connected by the pipe joint of the present invention may be corrugated pipes, but may be corrugated pipes and smooth pipes or other members. When connecting corrugated pipes, they may have different diameters.

[0031]

[Action]

 The pipe joint of the present invention pushes the holder and the packing into the inner part of the tubular body by tightening with the collar, the inner surface of the packing is the outer surface of the corrugated pipe, and the outer peripheral surface of the packing is the inner wall surface of the tubular body. Press it. As a result, a completely watertight seal can be achieved.

In the pipe joint of the present invention, the holder also enters into the cylindrical body. During this entry, the holder is guided by the inner peripheral surface of the tubular body and enters substantially parallel to its central axis. Therefore, at the time of connection work, the packing stored in the tubular body is pushed straight into the tubular body by the holder. Therefore, according to the pipe joint of the present invention, even if it is necessary to perform the connection work in a bad posture in which the tubular body or the corrugated pipe is tilted, the connection with good water tightness can be surely made.

In addition, in the pipe joint of the present invention, since the holder is inserted into the tubular body, the packing can be completely contained in the tubular body. Therefore, in the pipe joint of the present invention, the tightening force applied to the packing can be efficiently converted into the crimping force with the tubular body, and a high degree of watertightness can be obtained.

[0034]

【Example】

 Hereinafter, the present invention will be described in more detail based on embodiments with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional side view showing a state (Example 1) in which two spiral corrugated pipes are connected using an embodiment of the pipe joint according to the present invention. FIG. 2 is a partial cross-sectional side view showing a state in which a corrugated pipe having a spiral corrugation and a pipe having a smooth outer surface such as a vinyl chloride pipe or a metal pipe are connected using the pipe joint according to the present invention. . 3, 4, 5, and 6 are views showing a packing, a holder, a collar, and a tubular body, respectively.

Example 1 A pipe joint 11 shown in FIG. 1 is a pipe joint for connecting longitudinally corrugated pipes 14 and 15 having spiral corrugations 13 and 13 ′ formed in the longitudinal direction. . As shown in FIG. 3, the pipe joint 11 is to be attached to both sides of the tubular body 16 having the annular stopper portion 17 at the center as shown in FIG. 6 and the stopper portion 17 in the tubular body 16. Such two packings 18 and 18 ', two holders 19 and 19' as shown in FIG. 4, which are to be mounted on both sides thereof, respectively, and screwed into the outer ends of the tubular body 16 respectively. It is a combination of parts to be tightened, which consists of two collars 20 and 20 'as shown in FIG.

As shown in FIG. 3, the packing 18 is formed into a truncated cone shape in which the outer diameter of one end surface 22 is smaller than the outer diameter of the other end surface 24 and the outer circumference is a tapered surface 23. The Shore hardness HS Is 30 vulcanized rubber products. Both end faces 22 and 24 thereof are parallel to each other and are orthogonal to the longitudinal center line, and the end face 22 on the side of the smaller outer diameter improves adhesion with the stopper portion 17 of the tubular body 16 described later. It has a smooth surface.

The width of the packing 18 is substantially equal to one pitch length of the spiral corrugations 13, 13 ′ (see FIG. 1) of the corrugated pipes 14, 15 and the corrugated pipes 14, 15 along the center line of the truncated cone. There is a through hole through which the spiral corrugation 26, whose length corresponds to the spiral wave shape 13 and 13 'of the corrugated tubes 14 and 15, and which corresponds to one pitch length, 26 'is formed.

The holder 19 shown in FIG. 4 is formed in a cylindrical shape having an outer diameter equal to or slightly smaller than the outer diameter of the end surface 24 of the packing 18 having the larger outer diameter. The outer diameter is substantially equal to or slightly smaller than the inner diameter of the portion accommodating the dar 19. This holder 19 is made of hard plastic, and its length is set to be approximately equal to one pitch length of the spiral corrugations 13, 13 '(see FIG. 1) of the corrugated tubes 14, 15. The holder 19 has both end faces 28, 28 parallel to each other and orthogonal to the longitudinal center line of the cylinder, and a through hole for passing the corrugated pipe is provided along the center line of the cylinder.

On the wall surface of the through hole, hooking portions 30, 30 ′ that can be screwed into the spiral corrugations 13, 13 ′ of the corrugated pipes 14, 15 are provided at three locations at equal intervals in the circumferential direction. It is provided in. These hooking portions 30, 30, 30 are provided in the lengthwise direction of the holder 19 at substantially the same pitch as the spiral corrugations 13, 13 'of the corrugated tubes 14, 15. In order to improve the insertability of the corrugated pipe, as shown in FIG. It is smaller than the depth of the valley.

As shown in FIGS. 1 and 6, the tubular body 16 is a substantially cylindrical hard plastic part having a thick wall portion 32 having a large wall thickness in the center for reasons of strength. An annular stopper portion 17 extending in the radial direction is provided inside the thick portion 32, and a thread 34 that is screwed into a thread 44 of a collar 20 described below is provided at both ends of the tubular body 16. It is provided.

After connecting the corrugated pipes 14 and 15, the inner diameter of the stopper portion 17 is set to the end surface of the corrugated pipes 14 and 15 so as not to interfere with the passage of electric wires, cables, etc. in the corrugated pipes. It is set to be slightly larger than the inner diameter of. The corrugated pipes 14 and 15 are connected by the pipe joint 11 of this embodiment to the surfaces on both sides of the stopper portion 17, and they are brought into close contact with the small-diameter end faces 22 and 22 of the packings 18 and 18 ', respectively. Therefore, the surfaces on both sides of the stopper portion 17 are orthogonal to the longitudinal centerline of the tubular body 16, and are finished as smooth surfaces to improve the adhesion with the end surface 22 of the packing 18.

On both sides of the stopper portion 17, there are wall surfaces similar to the contour of the tapered outer peripheral surface 23 of the packing 18 and having a relative inner diameter dimension slightly smaller than the tapered surface 23, and the packing 18 is compressed. A packing accommodating portion 36 for accommodating and a holder accommodating portion 38 in the form of a cylindrical hole having an inner diameter slightly larger than the outer diameter of the holder 19 are provided further adjacent thereto. The holder 19 is well accommodated in the holder accommodating portion 38.

The packing accommodating portion 36 is largely inclined in the longitudinal direction, but the holder accommodating portion 38 is flat or has an inclination necessary for molding.

The length from the contact surface of the stopper portion 17 with the packing 18 to the end surface of the tubular body 16 is slightly shorter than the sum of the lengths of the packing 18 and the holder 19 in the longitudinal direction. If the length from the contact surface of the topper part 17 with the packing 18 to the end face of the tubular body 16 is longer than the sum of the lengths of the packing 18 and the holder 19 in the longitudinal direction, tightening with the collar 20 described later. This is because the effect is diminished. That is, one end of the holder 19 is slightly exposed from the end surface of the main body 16 in a state where the packing 18 and the holder 19 are housed in the packing accommodating portion 36 and the holder accommodating portion 38, respectively.

As shown in FIGS. 1 and 5, the collar 20 is a hard plastic component including a cylindrical portion 40 and an end portion 42. The collar 20 is screwed into the cylindrical body 16 at the cylindrical portion 40. The end wall 42 has an opening 43 having a diameter larger than the maximum outer diameter of the corrugated pipes 14 and 15, that is, the diameter of the crests of the corrugated pipes 13 and 13 ', for passing the corrugated pipes 14 and 15. The collar 20 has such strength that the packing 18 and the holder 19 can be tightened.

Next, the procedure for connecting the corrugated pipes 14 and 15 using the pipe joint 11 of the present embodiment will be described with reference to FIG.

First, the collar 20 is passed through the corrugated tube 14. At this time, the cylindrical portion 40 of the collar 20 is positioned on the end side of the corrugated pipe 14. Then, the holder 19 is screwed into the corrugated pipe 14 and attached to the corrugated pipe 14 so that the holder 19 is positioned near the end of the corrugated pipe 14. Next, the packing 18 is screwed into the corrugated tube 14 so that the end surface 22 of the packing 18 is aligned with the end surface of the corrugated tube 14. At this time, the end surface 22 having a small outer diameter is set to the end portion side of the corrugated pipe 14. Then, the holder 19 is brought into contact with the other end surface of the packing 18.

The collar 20 ', the holder 19', and the packing 18 'are attached to the other corrugated tube 15 in the same manner as described above.

Next, the corrugated tube 14 covered with the holder 19 and the packing 18 is covered with the right side portion of the tubular body 16 and pushed in until the stopper portion 17 comes into contact with the end surface of the corrugated tube 14. Similarly, the other corrugated pipe 15 covered with the holder 19 'and the packing 18' is also covered with the left side portion of the tubular body 16 and pushed in until the stopper portion 17 abuts on the end face of the corrugated pipe 15. Next, the two collars 20 and 20 'are screwed into both ends of the tubular body 16, respectively, and the holders 19 and 19' are pushed into the tubular body 16 to the rear.

As a result, the holder 19 pushes the packing 18 straight into the tubular body 16, and as shown in FIG. 1, the end face 22 is the surface of the stopper portion 17 and the corrugated 26 is the corrugated pipes 14 and 15. The tapered surface 23 can be further pressure-bonded to the corrugations 13 and 13 'on the outer surface to the inner wall surface of the tubular body 16 to complete a watertight seal.

Although the stopper portion 17 is formed integrally with the main body 16 in the above embodiment, the present invention is not limited to this, and a disc having a hole in the center may be used as the stopper. Moreover, when connecting the corrugated tubes 14 and 15 having the same diameter, a tubular body without the stopper portion 17 can be used.

As described above, even after the packing 18 is brought into close contact with water and water enters the end face 24 of the packing 18 due to water intruding through the gap between the collar 20 and the tubular body 16, the direction in which the water pressure acts is Since the packing 18 is in the direction of further closely adhering to the tubular body 16 and the corrugated pipes 14 and 15, even if the tightening by the collar 20 is initially loose, high watertightness can be obtained.

Further, in the pipe joint 11 of the present embodiment, the hooking portions 30, 30 ′ of the holder 19 lock the corrugated portions 13, 13 ′ (valley portion) of the corrugated pipes 14, 15 to fix the holder 19 to the holder 19. Since the collar 20 is tightened, the ability to prevent the corrugated pipes 14 and 15 from coming off the pipe joint 11 is very large.

In connecting the corrugated pipes 14 and 15, the pipe joint 11 of the present embodiment uses only a small number of molded parts, that is, the packing 18, the holder 19, the collar 20, and the tubular body 16, and screws them in. Since it can be completed only by the work, no skill is required for the work. In addition, workability is high because there is no experience of tape holding and winding work that requires poor experience and workability.

Further, the tubular body 16 used in the pipe joint 11 of the present embodiment can have a short structure, while the packing 18 can be made thicker, so that the conventional corrugated sleeve shown in FIG. 10 is used. Unlike the joint A, even if there are wraps left at the ends of the corrugated pipes 14 and 15, those parts can be screwed into the corrugated pipes 14 and 15 without difficulty.

Further, in this pipe joint, since the holder 19 is housed in the tubular body 16, when the holder 19 enters the tubular body 16, the holder 19 is guided by the inner surface of the tubular body 16 to be substantially centered. Enter in parallel along the axial direction. Therefore, at the time of connection work, the packing 18 accommodated in the tubular body 16 is pushed straight into the tubular body 16 by the holder 19. Therefore, according to this pipe joint, even if it is necessary to perform the connection work in a bad posture in which the tubular body 16 and the corrugated pipes 14 and 15 are inclined, a water-tight connection can be surely made.

In addition, in this pipe joint, since the packing 18 can be completely accommodated in the tubular body 16 by providing the holder 19, the tightening force applied to the packing 18 can be efficiently applied to the tubular body. It is possible to obtain a high degree of watertightness by converting to the pressure bonding force with 16.

Example 2 FIG. 2 is a diagram showing a second example of the pipe joint. The pipe joint 12 is a pipe joint for connecting the corrugated pipe 14 in which a spiral corrugation 13 is formed in the longitudinal direction and the outer surface smooth pipe in the longitudinal direction, and the connecting structure on one side of the first embodiment. Has been replaced by the connection part 70 with the outer smooth tube.

Example 3 FIG. 7 shows a packing 50 which is a modified example 1 of the packing 18, in which FIG. 7 (a) is a front view of a half body of the packing 50, and FIG. 7 (b) is FIG. 6 is a partial cross-sectional side view of packing 50. The packing 50 has a circular truncated cone shape like the packing 18, but has an annular convex portion 54 on an end surface 52 having a small diameter, the opening diameter of which is substantially equal to the inner diameters of the corrugated pipes 14 and 15.

When the packing 50 is screwed into the corrugated pipes 14 and 15, the packing 50 stops when the end faces of the corrugated pipes 14 and 15 come into contact with the annular convex portion 54. Therefore, when tightened with the collar 20, the small-diameter end surface 52 of the packing 50 can be surely brought into close contact with the stopper portion 17 of the tubular body 16 to ensure watertightness.

Example 4 FIG. 8 shows a color 60 which is a modification of the color 20. FIG. 8A is a front view of a half body of the color 60, and FIG. It is a partial cross-sectional side view of 60. The collar 60 has a non-slip protrusion 62 at an appropriate position on the outer periphery for the convenience of gripping the outer periphery when the collar 60 is screwed into the end of the tubular body 16.

Example 5 FIG. 9 shows a tubular body 80 which is a modified example of the tubular body 16, and FIG. 9A shows a front view of a half body of the tubular body 80. 9 (b) is a partially cutaway side view of the joint tubular body 80 shown in FIG. 9 (a). The tubular body 80 has a non-slip projection 82 at an appropriate position on the outer periphery for the convenience of gripping the outer periphery when the collar 20 is screwed into the end of the tubular body 80. The configuration and operation of the pipe joint 11 of the present embodiment have been described above assuming that the corrugated pipes 14 and 15 are the same corrugated pipes having the same dimensions and the same corrugated shape. By connecting the size and shape of parts, especially the packing corrugation and the shape of the holder retaining part to the corrugation of each corrugated pipe to be connected, the corrugated pipes with slightly different pipe diameters and slightly different corrugations can be connected. can do.

[0063]

[Effect of device]

 In the pipe joint of the present invention, the holder pushes the packing into the inside of the tubular body by tightening with the collar, and the end face of the packing penetrates the stopper portion surface of the tubular body in cooperation with the wall of the tubular body. The corrugated surface of the hole is brought into pressure contact with the corrugated surface of the corrugated pipe, and the outer peripheral surface thereof is brought into pressure contact with the inner wall surface of the tubular body, whereby the connection portion of the corrugated pipe can be sealed in a watertight manner.

In the pipe joint of the present invention, since the holder locks the corrugated pipe and the collar tightens the holder inside the tubular body, the pipe joint is highly resistant to the force of pulling the corrugated pipe from the pipe joint. Is.

Since the pipe joint of the present invention can connect the corrugated pipe by using the combination part made of the relatively thick packing and the short tubular body which has already been formed, instead of sealing by the tape, It has high workability in the field, is easy to install even on corrugated pipes that have a curl, and requires no skill.

In the pipe joint of the present invention, the holder is guided by the inner surface of the tubular body so as to enter the central axis in a substantially parallel manner. Therefore, at the time of connection work, the packing accommodated in the tubular body is It is pushed straight into the tubular body by the holder. Therefore, even when the connection work must be performed in a bad posture in which the tubular body or the corrugated pipe is tilted, the connection with good water tightness can be reliably performed.

In addition, in the pipe joint of the present invention, since the packing can be completely housed in the tubular body by providing the holder, the tightening force applied to the packing can be efficiently crimped to the tubular body. It can be converted into force and obtain a high degree of water tightness.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a first embodiment of a corrugated pipe connection structure according to the present invention.

FIG. 2 is a partial cross-sectional side view showing a connection structure according to a second embodiment.

3A is a front view of the packing, and FIG. 3B is a partial cross-sectional side view.

4A is a front view of a holder, and FIG. 4B is a partial cross-sectional side view.

5A is a front view of a collar, and FIG. 5B is a partial cross-sectional side view.

FIG. 6A is a front view of the main body, and FIG. 6B is a partial cross-sectional side view.

FIG. 7 (a) is a front view of a modified packing example 1; FIG.
[Fig. 4] is a partial cross-sectional side view.

FIG. 8A is a front view of a modified example of a collar, and FIG. 8B is a partial cross-sectional side view.

9A is a front view of a modified example of the main body, and FIG. 9B is a partial cross-sectional side view.

FIG. 10 is a partial cross-sectional side view showing a state where two corrugated pipes are connected using a conventional connecting means.

FIG. 11 is a cross-sectional view showing a second example of the conventional connection structure.

[Explanation of symbols]

 11 Corrugated pipe connection structure (1) 12 Corrugated pipe connection structure (2) 13, 13 'Corrugated pipe corrugation 14, 15 Corrugated pipe 16 Main body 17 Stopper section 18 Packing 20 Collar 22 Small diameter end face 23 Tapered surface 24 Large-diameter end surface 26, 26 'Packing spiral corrugation 28 Holder end surface 30, 30' Holder latching part 32 Thick part 34 Main body joining part 36 Packing accommodating part 38 Holder accommodating part 40 Cylindrical part 42 End face 43 Opening 44 Collar joining part 50 Packing modification 1 52 End face with a small diameter 54 Annular convex part 60 Color modification 62 Projection 70 Smooth tube connection 80 Body modification 82 Projection

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[Procedure amendment]

[Submission date] April 19, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of device] Corrugated pipe joint

[Scope of utility model registration request]

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing a first embodiment of a pipe joint according to the present invention.

FIG. 2 is a partial cross-sectional side view showing a pipe joint according to a second embodiment.

3A is a front view of the packing, and FIG. 3B is a partial cross-sectional side view.

4A is a front view of a holder, and FIG. 4B is a partial cross-sectional side view.

5A is a front view of a collar, and FIG. 5B is a partial cross-sectional side view.

FIG. 6A is a front view of a tubular body, and FIG. 6B is a partial cross-sectional side view.

FIG. 7A is a front view of a modified packing example 1.
(B) is a partial cross-sectional side view.

FIG. 8A is a front view of a modified example of a collar, and FIG. 8B is a partial cross-sectional side view.

9A is a front view of a modified example of a tubular body, and FIG. 9B is a partial cross-sectional side view.

FIG. 10 is a partial cross-sectional side view showing a state where two corrugated pipes are connected using a conventional connecting means.

FIG. 11 is a sectional view showing a second example of the conventional pipe joint.

[Explanation of symbols] 11 Pipe joint (1) 12 Pipe joint (2) 13, 13 'Waveform of corrugated pipe 14, 15 Corrugated pipe 16 Cylindrical body 17 Stopper part 18 Packing 20 Color 22 End face with small diameter 23 Taper Face 24 Large-diameter end face 26, 26 'Packing spiral corrugation 28 Holder end face 30, 30' Holder retaining part 32 Thick part 34 Cylindrical joining part 36 Packing accommodating part 38 Holder accommodating part 40 Cylinder Part 42 End face 43 Opening 44 Collar joint 50 Packing modification 1 52 End face with a small diameter 54 Annular convex 60 Color modification 62 Protrusion 70 Smooth pipe connection 80 Cylindrical modification 82 Protrusion

Claims (1)

[Scope of utility model registration request] 1. Outer spiral corrugations (13) on at least one side
In a connection structure to which a pipe (14) having a corrugated pipe is connected, a packing (18) having a through hole having an inner surface that closely adheres to the outside of the corrugated pipe, and a hook for locking the trough portion of the corrugated pipe. A holder (19) having a portion (30) in the hole wall and a stopper portion (17) protruding inward in the radial direction are provided in the cylinder, the packing is provided outside the stopper portion, and the holder is provided outside thereof. The main body (1
6) and a collar (20) lockable to the main body, the collar (20) having an end wall (42) having an opening (43) with a diameter larger than the maximum outer diameter of the corrugated pipe in the center, the holder The corrugated pipe connecting structure is characterized in that the outer surface of the holder and the inner surface of the main body are guided so that the direction of entry into the main body is substantially along the longitudinal centerline of the portion of the main body that accommodates the packing and the holder.