JPH09159071A - Joint part structure for synthetic resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase an adhesion area of a joint part so as to dispense with a pressing time after insertion by forming a predetermined length joint part, which is provided with a taper tapering off from an opening edge to the other end, on the inner circumference of a receiving port and arranging a projection bar in the inner circumference edge of the opening edge.. SOLUTION: In an insertion port 2, its outer circumference is turned into a taper whose diameter is increased from the opening end to the other end, and a joint part 2a with the predetermined length is formed, while on the outer circumference, a recess groove 2c is additionally arranged via an approach inclination 2b. In the boundary part between the insertion port, 2 and a pipe main body part, a butting stepped part 2d at the tip of a receiving port 3 is arranged. In the receiving port 3, its inner circumference is turned into a taper which tapers off from the opening end to the other end and is steeper than the joint part 2a, and a joint part 3a is formed. On the inner circumference in the vicinity of the opening part of the joint part 3a, a projection thread 3c to be fitted in the recess groove 2c is arranged via an approach inclination 3b. A butting stepped part 3d at the tip of the insertion port 3 is arranged in the boundary of the pipe main body part in the depth end of the joint part 3a on the inner circumference.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cable protection tube,
Bonding of synthetic resin pipes such as hard vinyl chloride pipes used for sewers and water wells with an adhesive, especially using an adhesive to bond synthetic resin pipes by the swelling action of the bonding surface The present invention relates to a structure of a joint portion of a synthetic resin pipe in which an adhesive bonding area is increased and a holding time for retaining an insertion force until the initial adhesive bonding is obtained is unnecessary. .

[0002]

2. Description of the Related Art Conventionally, cable protection pipes, sewers and water well pipes have been provided as synthetic resin pipes such as hard vinyl chloride pipes, and the connection of the synthetic resin pipes is bonded through a pipe joint. Means for adhesively bonding with agents are generally used.
That is, a means is generally well known in which an adhesive is applied to the socket of the pipe joint and the socket of the synthetic resin pipe, the socket is inserted into the socket, and the adhesive bonding is performed by the swelling action of the adhesive. .

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention A pipe joint used for cold insertion and adhesive joining of synthetic resin pipes which is generally used at present is formed by providing a taper at a receiving port, while the tip of the synthetic resin pipe is formed. The outlets of are formed in parallel. However, the taper provided at the receiving end of the pipe joint has a small adhesive area even if a crimping force can be obtained by inserting an appropriate amount of the synthetic resin pipe inlet, and a part of the tip of the outlet is adhered. However, the actual situation is that strong and reliable adhesion has not been obtained.

Further, the adhesive used for joining vinyl chloride pipes is such that the surfaces of the pipes and joints are swollen by being applied to the joints, and the swollen layers are entangled by joining and the joining surfaces are integrated. Therefore, the longer the curing time is, the higher the adhesive strength can be obtained. However, the taper provided at the receiving end of the joint may return the tube if the insertion force is removed immediately after inserting the tube.Therefore, the holding time for holding the insertion force until the initial adhesive force is obtained. Is necessary. According to the technical data of hard vinyl chloride pipe for water supply, the holding time for TS joining is set to be 30 seconds or longer when the nominal diameter is 50 mm or less, and 60 seconds or longer when the nominal diameter is 75 mm or more. Such a long holding time has been a difficult task requiring skill in joining work.

Further, the connection of pipes using a joint requires two joint operations for joining pipes on both sides of the joint, and moreover, the joint is in a state of protruding to the outer peripheral surface of the joint portion of the pipe. However, when a large number of pipes are installed in the sheath pipe, such as electric wire pipes, there is a problem that the protrusion of the joint becomes an obstacle.

The present invention has been made in view of the above problems, and an object of the present invention is to increase the bonding area of the joint portion and to make the pressing work after insertion unnecessary, thereby facilitating the joining work. It is intended to provide a structure of a joint portion of a synthetic resin pipe in which reliable adhesion can be obtained and a protrusion is removed from the inner and outer surfaces of the 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 has a spout on the outer circumference on one end side and a receiving port on the inner circumference on the other end side. The spigot forms a joint of a predetermined length provided with a taper from the opening edge to the other end, and a groove is formed around the outer periphery of the rear end of the joint. The receiving opening is formed with a joining portion of a predetermined length provided with a taper on the inner circumference from the opening edge to the other end, and a ridge is provided around the inner edge of the opening edge. Formed.

The pressure side flanks of the concave groove of the inlet and the convex ridge of the receiving opening are formed at 90 to 85 degrees with respect to the tube axis, the receiving opening is a taper 1/50, and the opening is a taper. -Par 1/50 to 1 /
As 60, the outer diameter of the tip of the spigot is reduced by about 0.2 mm from the inner diameter of the rear end of the spigot, and the inner diameter of the spigot and the outer diameter of the spigot are substantially at the lower position of the approach gradient. It is preferable that they are formed to have the same diameter.

The synthetic resin pipe is preferably a hard vinyl chloride pipe joined with an adhesive for a hard vinyl chloride pipe joined to the adhesive by the swelling action of the adhesive surface.

The outlet is provided with an abutting step portion at the opening end of the receiving opening on the play side of the concave groove on the outer periphery, and the receiving opening is provided with the opening tip of the opening at the inner end of the joint portion. It is preferable to provide a contact step.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a synthetic resin pipe, and FIG.
Is an enlarged cross-sectional view of the main part of the spigot, FIG. 3 is an enlarged cross-sectional view of the main part of the receiving port, and FIG. 4 is an enlarged cross-sectional view of the main part in a joined state. The pipe 1 is a synthetic resin pipe such as a hard vinyl chloride pipe. This pipe 1 is formed by providing a spout 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 spout 2 is large from the open end of the outer circumference to the other end. A tapered portion 2a having a predetermined length is formed by turning a taper having a diameter, and a concave groove 2c is provided around the outer periphery of the rear end side of the joined portion 2a via an approach gradient 2b. A groove 2c is formed on the play side, that is, at the boundary between the spigot 2 and the pipe main body, by forming a step 2d at the end of the receiving end 3 from the opening end of the inner periphery to the other end. Make a small warp to the end and use the above 2
A joining portion 3a for turning a taper having a length corresponding to that of the joining portion 2a and stronger than the joining portion 2a is formed. 2a is provided with a protrusion 3c, and a step 3 at the end of the spigot 3 is abutted at the boundary of the pipe main body at the inner end of the joint 3a.
It is configured by providing d.

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

The joint 3a of the receiving port 3 is a taper 1/50.
The joint portion 2a of the spigot 2 is a taper 1/50 to 1/60 in order to provide a swelling white, and the inner diameter D1 of the rear end portion of the joint portion 3a of the receptacle 3 is set to the spigot 2 Is larger than the outer diameter d1 of the tip portion of the joining portion 2a of 0.2 mm or larger than the outer diameter d1 and at the lower position of the approach gradients 2b and 3b.
It is preferable that the inner diameter D2 and the outer diameter d2 of the inlet 2 are substantially the same, that is, d1 = D1 + 0.2 mm and d2.apprxeq.D2. However,
The par is not limited to this, and it is needless to say that the par is selectively formed in various gradients according to the tube diameter.

The concave groove 2c of the spigot 2 and the ridge 3c of the receptacle 3
It is preferable to form the pressure side flank of 90 to 85 degrees, most preferably 90 degrees with respect to the tube axis, and form the inclination of the chamfer 3e and the inclined surface 2e on the play side to about 30 degrees. Further, the approach gradients 2b and 3b are preferably about 15 degrees.

In connection work of the pipe 1 in the present invention,
The pipe 1 is a hard vinyl chloride pipe, and the adhesive is vinyl chloride.
A vinyl chloride tube adhesive for swelling and adhering the surface of the pipe is used, and as shown in FIG.
The adhesive is applied to the joint 2a of the spigot 2 and the joint 3a of the socket 3 of the other tube 1b, and the spigot 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 strip 3c of the receiving opening 3. That is, since the concave groove 2c of the spigot 2 is pressed by fitting the concave groove 3c of the receiving port 3 between the pipe 1a and the pipe 1b, the pressing time after the insertion is completely unnecessary. However, the pipe 1 and the adhesive are not necessarily limited to the hard vinyl chloride pipe or the one for adhering the vinyl chloride pipe, and even when the ordinary bond is used for the hard vinyl chloride pipe, This is extremely advantageous because the effect of holding down the time until the adhesive effect due to the solidification of the bond acts can be obtained.

The recessed groove 2c formed in the spout 2 is provided in the deepest portion of the joint 2a at the thickest portion,
Since it is strong against impact and is fitted at the final stage of the insertion process, the fitting can be performed reliably and easily. In addition, the contacting step portion 2 provided at the outlet 2 and the receiving port 3
d and 3d have no protrusions on the outer circumference of the joint between the pipes 1a and 1b, and the outer and inner peripheries are connected in the same horizontal plane.

[0017]

Since the present invention has the above-mentioned structure,
The taper provided at the spigot and the spigot facilitates insertion and at the same time increases the bonding area of the joint. Further, since the concave groove of the outlet is fitted to the convex ridge of the receiving opening, the holding time after the insertion becomes unnecessary. As a result, the joining work can be facilitated and a reliable adhesion can be obtained. Moreover, compared with the case where a pipe joint is used, the structure of the joint portion of the present invention has the joint portion at one place and the bonding work time Is reduced by half, and the cost of connecting the synthetic resin pipe is low. Further, it is possible to provide the structure of the joint part of the synthetic resin pipe in which the protrusion is removed from the outer periphery of the connecting part of the pipe, which not only facilitates the plural pipe work in the sheath pipe of the electric wire but also reduces the number of pipes. There is an advantage that the number can be increased.

[Brief description of the drawings]

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

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

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

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

[Explanation of symbols]

 1 Pipe 2 Outlet 3 Receiving Port 2a Joint 2b Approach Gradient 2c Recessed Groove 2d Step 2e Chamfer 3a Joint 3b Approach Gradient 3d Step 3e Slope

Claims (3)

[Claims] 1. A predetermined length in which a spigot is provided at one end side and a receiving port is provided at the other end side, and the spigot is provided with a taper from the opening edge to the other end. And a concave groove is formed around the outer periphery of the innermost end side of the joint, and the receptacle has a taper on the inner periphery from the opening edge to the other end. A structure of a joint portion of a synthetic resin pipe, characterized in that a joint portion having a predetermined length is formed and a projecting strip is formed around an inner peripheral edge of an opening edge. 2. A predetermined length provided with a spigot on the outer circumference on one end side and a receiving spigot on the inner circumference on the other end side, wherein the spigot is provided with a taper from the opening edge to the other end. And a concave groove is formed around the outer periphery of the innermost end side of the joint, and the receptacle has a taper on the inner periphery from the opening edge to the other end. A protrusion is formed around the inner peripheral edge of the opening edge while forming a joint portion having a predetermined length, and the pressure side flank of the recess groove of the above-mentioned opening and the protrusion of the receiving port is attached to the pipe axis. A structure of a joint portion of a synthetic resin pipe, which is formed at 90 to 85 degrees. 3. A hard vinyl chloride pipe joined by using an adhesive that adheres by the swelling action of an adhesive surface, wherein an outer periphery on one end side is provided with a receiving port on the inner periphery on the other end side, and The spigot forms a joint of a predetermined length provided with a taper from the opening edge to the other end, and a groove is formed on the outer periphery of the rear end side of the joint through an approach gradient. The receiving port has a joint portion of a predetermined length provided with a taper on the inner circumference from the opening edge to the other end, and the acceptor is formed on the inner peripheral edge of the opening edge. H is formed by surrounding a ridge through a gradient, and the groove on the side of the inlet and the pressure flank of the ridge on the side of the receiving port are formed at 90-85 degrees with respect to the pipe axis. Is provided on the play side of the recessed groove at the end of the opening of the receiving port, and at the inner periphery of the receiving port is provided at the rear end of the joint at the contacting step of the opening end of the opening. The structure of the joint part of the synthetic resin pipe characterized by the following.