JP3360086B2 - Structure of joint part of synthetic resin pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cable protection tube,
Bonding of synthetic resin pipes such as hard vinyl chloride pipes used for pipes for sewers and water wells with an adhesive, particularly using an adhesive to bond the synthetic resin pipe by the swelling action of the bonding surface The present invention relates to a structure of a joint portion of a synthetic resin pipe which aims to increase an adhesion area of an adhesive and does not require a holding time for holding an insertion force until an initial adhesion of the adhesive is obtained. .

[0002]

2. Description of the Related Art Conventionally, cable protection tubes, pipes for sewers and water wells have been provided as synthetic resin tubes such as hard vinyl chloride tubes and the like, and the connection of the synthetic resin tubes is made by bonding through pipe joints. Means for bonding with an agent are generally used.
That is, means for applying an adhesive to the socket of the pipe joint and the spigot of the synthetic resin pipe, inserting the spigot into the spigot, and bonding and joining by a swelling action of the adhesive is generally well known. .

[0003]

A pipe joint used for cold insertion bonding of a synthetic resin pipe generally used at present is formed by providing a taper at a receiving port, while a tip end of the synthetic resin pipe is provided. Are formed in parallel. However, the taper provided at the socket of the pipe joint has a small bonding area even if a suitable amount of crimping force is obtained by inserting a proper amount of the spigot of the synthetic resin pipe, and a part of the tip of the spigot is bonded. The fact is that strong and secure adhesion has not been obtained.

[0004] The adhesive used for joining a vinyl chloride pipe is one that swells the surface by applying it to the pipe and the joint, and that the swelling layer becomes entangled by joining, thereby integrating the joining surface. Therefore, the longer the curing time, the higher the adhesive strength. However, the tape provided at the joint port may return if the insertion force is removed immediately after the insertion of the tube, so the holding time for maintaining the insertion force until the initial adhesive force is obtained. Is necessary. According to the technical data of hard water-purified vinyl chloride pipes for water supply, the holding time of the TS joint is specified as long as 30 seconds or more when the nominal diameter is 50 mm or less, and 60 seconds or more when the nominal diameter is 75 mm or more. Such a long holding time has been a difficult task requiring skill for the joining operation.

[0005] Furthermore, the connection of pipes using a joint requires two joining operations for joining the pipes to both sides of the joint, and furthermore, the joint is protruded from the outer peripheral surface of the joint of the pipes. However, when a large number of pipes are formed in a sheath pipe such as a pipe for an electric wire, there is a problem that the protrusion of the joint becomes an obstacle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to increase a bonding area of a bonding portion and to eliminate a pressing time after insertion to facilitate a bonding operation. An object of the present invention is to provide a structure of a joint portion of a synthetic resin pipe in which reliable adhesion can be obtained and protrusions are removed from inner and outer surfaces of a connection portion.

[0007] In order to achieve the above object, the structure of the joint portion of the synthetic resin pipe according to the present invention is a rigid vinyl chloride pipe joined by using an adhesive bonded by swelling action of an adhesive surface. A spigot is provided in the inner periphery on the other end side, and the spigot forms a joining portion of a predetermined length provided with a taper having a large diameter from the opening edge to the other end, and the joining portion has A concave groove is formed around the outer periphery of the back end portion through an approach gradient, and the receiving port is formed with a joining portion of a predetermined length provided with a taper having a small diameter from the opening edge to the other end on the inner periphery. Forming and forming a ridge on the inner peripheral edge of the opening edge through an approach gradient to increase the adhesive area between the tapered spigot and the socket, and insert the spigot into the socket Thus, the ridge of the spigot can be freely fitted into the groove of the socket.

The concave groove of the spout and the pressure side flank of the ridge of the spout are formed at 90 to 85 degrees with respect to the tube axis, the spout is a taper 1/50, and the spout is a tape. -1/50 to 1 /
At 60, the outer diameter of the front end of the spout is made smaller by about 0.2 mm than the inner diameter of the rear end of the spout, and the inner diameter of the spout and the outer diameter of the spout are substantially equal at the lower part of the approach gradient. It is preferable to form them so that they have the same diameter.

The synthetic resin pipe is preferably a rigid vinyl chloride pipe joined by using an adhesive for a rigid vinyl chloride pipe to be joined to an adhesive by a swelling action of an adhesive surface.

[0010] The spigot is provided with a contact step at the front end of the opening on the play side of the groove on the outer periphery, and the spout has a front end at the opening end of the spigot at the inner end of the joint at the inner periphery. It is preferable to provide a contact step.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.
Is an enlarged cross-sectional view of a main part of a spigot, FIG. 3 is an enlarged cross-sectional view of a main part of a socket, FIG. 4 is an enlarged cross-sectional view of a main part in a joined state, and a pipe 1 is a synthetic resin pipe such as a hard vinyl chloride pipe. The tube 1 is formed by providing a spigot 2 on the outer circumference on one end side and a receiving port 3 on the inner circumference on the other end side, and the spigot 2 increases from the open end of the outer circumference to the other end. A joining portion 2a of a predetermined length is formed by turning a taper having a diameter, and a concave groove 2c is formed around an outer periphery of a back end side of the joining portion 2a through an approach gradient 2b. A step 2d is formed at the play side of the groove 2c, that is, at the boundary between the spout 2 and the pipe body, to form a step 2d at the end of the receptacle 3, and the receptacle 3 is connected to the other end from the inner peripheral opening end. Make a small diameter toward the end and make the outlet 2
And a joining portion 3a for turning a taper having a length corresponding to that of the joining portion 2a and being slightly stronger than the joining portion 2a, and forming the concave groove on the inner periphery of the opening side of the joining portion 3a through an approach gradient 3b. 2c is provided with a ridge 3c to be fitted therein, and a stepped portion 3 at the end of the spigot 3 at the boundary of the pipe body at the inner end of the joint 3a at the back end.
and d.

The protruding ridge 3c provided in the receiving port 3 is formed in a saw-tooth shape, and a chamfer 3e for inserting and guiding the protruding ridge 3c into the concave groove 2c is formed on the play-side flank of the ridge 3c, that is, on the inner peripheral edge on the opening side.
Is preferably formed. In addition, the concave groove 2
c is formed in a shape symmetrical to the serrated ridge 3c, and the inclined surface 2e symmetrical to the chamfer 3e is formed on the play side of the concave groove 2c.
Is formed in a shape provided with.

The joint 3a of the receptacle 3 is a taper 1/50.
The joint 2a of the spout 2 is tapered 1/50 to 1/60 so that the inner diameter D1 of the back end of the joint 3a of the spout 3 can be provided with a swelling white. The outer diameter d1 at the tip of the joint 2a is about 0.2 mm larger or larger than the outer diameter d1, and the socket 3 is located at the lower part of the approach gradients 2b and 3b.
And the outer diameter d2 of the spigot 2 are preferably substantially the same, that is, d1 = D1 + 0.2 mm, and d2 ≒ D2. However,
The par is not limited to this, and it is a matter of course that the par is selectively formed at various gradients according to the pipe diameter.

The groove 2c of the spigot 2 and the ridge 3c of the socket 3
The pressure-side flank is preferably formed at 90 to 85 degrees with respect to the tube axis, most preferably at 90 degrees, and the slope of the play-side chamfer 3e and the inclined surface 2e is preferably formed at approximately 30 degrees. The approach gradients 2b and 3b are preferably approximately 15 degrees.

In the connecting operation of the pipe 1 according to the present invention,
Tube 1 is a rigid vinyl chloride tube, and the adhesive is vinyl chloride.
An adhesive for vinyl chloride pipe bonding is used to swell and bond the surface of the pipe, and as shown in FIG.
The adhesive is applied to the joint 2a of the spout 2 and the joint 3a of the socket 3 of the other tube 1b, and the spout 2 of one tube 1a is inserted into the socket 3 of the other tube 1b, The joining operation is completed by fitting the concave groove 2c of the spigot 2 into the convex ridge 3c of the socket 3. That is, since the pipe 1a and the pipe 1b are pressed by fitting the concave groove 2c of the spigot 2 into the concave groove 3c of the receiving port 3, the pressing time after insertion is completely unnecessary. However, the pipe 1 and the adhesive are not necessarily limited to hard vinyl chloride pipes or those used for bonding vinyl chloride pipes, and even if ordinary bonds are used for hard vinyl chloride pipes, This is extremely advantageous because an effect of holding down the time required for the bonding effect by the solidification of the bond to act can be obtained.

The groove 2c provided in the spigot 2 is provided at the thickest part in the back of the joint 2a,
Since it is resistant to impact and is fitted at the last stage of the insertion process, the fitting can be performed reliably and easily. Also, a contact step 2 provided on the outlet 2 and the receptacle 3
In d and 3d, there is no protrusion on the outer periphery of the joint between the pipes 1a and 1b to be joined, and the outer and inner peripheries are connected with the same horizontal plane.

[0017]

Since the present invention has the above configuration,
The taper provided at the spigot and the socket facilitates insertion and increases the bonding area of the joint. Then, since the concave groove of the spigot is fitted to the convex ridge of the receiving port, the pressing time after insertion becomes unnecessary. As a result, the joining operation can be facilitated and reliable adhesion can be obtained. In addition, compared to the case where a pipe joint is used, the structure of the joint portion of the present invention has a joint portion at one place and the joining operation time is reduced. Is reduced by half, and the connection of the synthetic resin pipe is reduced in price. Further, it is possible to provide a structure of a joint portion of a synthetic resin pipe in which a protrusion is removed from an outer periphery of a connection portion of the pipe, and not only a plurality of pipes can be easily formed in a sheath pipe of an electric wire, but also the number of pipes is reduced. There are advantages such as being able to increase.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a connecting portion of a synthetic resin pipe according to the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a spigot of a synthetic resin pipe according to the present invention.

FIG. 3 is an enlarged sectional view of a main part showing a socket of the synthetic resin pipe according to the present invention.

FIG. 4 is an enlarged sectional view of a main part showing a joined state of the synthetic resin pipe according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 pipe 2 spout 3 socket 2a joint 2b approach slope 2c concave groove 2d step 2e chamfer 3a joint 3b approach slope 3d step 3e slope

──────────────────────────────────────────────────続 き Continuing on the front page (73) Patent holder 598001571 Nippon Roll Manufacturing Co., Ltd. 9-3-1 Higashikasai, Edogawa-ku, Tokyo (73) Patent holder 593061916 Eidai Office Co., Ltd. Nihonbashi Kakishaku, Chuo-ku, Tokyo 1-3-5, Town (72) Inventor Shinji Hirabe 6-10-22, Jomyo-ji Temple, Kamakura City, Kanagawa Prefecture (72) Inventor Shigeru Hosaka 7-30-17, Kameido, Koto-ku, Tokyo (56) References Special JP-A-5-71676 (JP, A) JP-A-2-43583 (JP, U) JP-A 63-150183 (JP, U) Registered utility model 353177 (JP, U) JP-A 50-44570 (JP, U.S.A.) Y1) Jiko 29-768 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 1/02 F16L 1/024 F16L 13/00 F16L 13/10 F16L 21/00 F16L 47/02

Claims (2)

(57) [Claims] 1. A hard vinyl chloride pipe joined by using an adhesive which is bonded by a swelling action of an adhesive surface, wherein a spigot is provided at an outer periphery at one end and a receptacle is provided at an inner periphery at the other end. Is formed by forming a joint of a predetermined length provided with a taper having a large diameter from the opening edge to the other end, and forming a concave groove around an outer periphery of a back end side of the joint through an approach gradient. The receiving port forms a joining portion of a predetermined length provided with a taper having a small diameter from the opening edge to the other end from the opening edge on the inner periphery, and a ridge is provided around the inner periphery of the opening edge via an approach gradient. to form Te, tape
Increasing the area of adhesion between the spout having
And insert the spigot of the spigot into the groove of the socket.
The structure of the joint part of the synthetic resin pipe characterized by being freely adjustable . 2. A hard vinyl chloride pipe joined by using an adhesive which is bonded by a swelling action of an adhesive surface, wherein a spigot is provided at an outer periphery at one end and a receptacle is provided at an inner periphery at the other end. Is formed by forming a joint of a predetermined length provided with a taper having a large diameter from the opening edge to the other end, and forming a concave groove around an outer periphery of a back end side of the joint through an approach gradient. The receiving port forms a joining portion of a predetermined length provided with a taper having a small diameter from the opening edge to the other end from the opening edge on the inner periphery, and a ridge is provided around the inner periphery of the opening edge via an approach gradient. A step at the end of the opening of the socket on the play side of the groove on the outer periphery of the spigot, and the end of the opening of the spigot at the inner end of the spigot at the inner end of the joint. Steps are provided and tapered
Increase the area of adhesion between the spout and the receptacle, and
Insert the mouth and fit the ridge of the spigot into the groove of the socket.
The structure of the joint part of the synthetic resin pipe characterized by being present .