JP2003130279A - Synthetic resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin pipe allowing a connection operation to be performed easily and capable of providing a reliable and rigid connection. SOLUTION: A sloped surface having an inner diameter converging from an opening side toward a bottom and a plurality of locked projections 21 and 22 caught by the bottom end of the sloped surface and having steps are provided at the opening side forward half part of a receiving port 2. The locked projections 21 and 22 are formed in an extruded state to the inner peripheral side from the opening side gradually toward the bottom, and a tapered connection surface 20 having an inner diameter reduced gradually toward the bottom is provided at the bottom of the locked projection 22. On the other hand, a tapered connection surface 30 coming into contact with the tapered connection surface 20 provided at the bottom of the receiving port 2 through an adhesive agent is provided at the tip side at an insertion port 3. A plurality of locking grooves 31 and 32 fittedly locked to the plurality of locked projections 21 and 22 and comprising the sloped surfaces and hooked steps are provided at the rear of the tapered connection surface 30.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe such as a vinyl chloride resin pipe having a receiving port at one end and a port at the other end. Insert the spigot provided at the end of the other pipe into the receptacle provided at the end of one pipe,
The present invention relates to a synthetic resin pipe capable of obtaining a reliable and strong adhesive bond when connected via an adhesive. 2. Description of the Related Art Conventionally, a vinyl chloride resin pipe having a receiving port at one end and a port at the other end has been used as a pipe for water and sewage or a protective pipe through which a communication cable or the like is inserted. When performing piping work using this vinyl chloride resin pipe, insert the spigot provided in the other vinyl chloride resin pipe into the receptacle provided in one vinyl chloride resin pipe, Connected. [0003] Also, in the propulsion method of burying a pipe by propelling it underground, a vinyl chloride resin pipe having a receiving port at one end and a port at the other end is used. While being propelled underground, a spigot provided at the tip of the following propulsion pipe is inserted into a receptacle provided at the rear end of the preceding propulsion pipe, and connected via an adhesive. . [0004] However, when the spigot of the other PVC resin tube is inserted into the spigot of the other PVC resin tube and bonded together, the joint surface between the spigot and the spigot is kept until the adhesive is cured. In some cases, the spigot may be displaced, or the spigot may fall out of the socket, and sufficient bonding strength may not be obtained. For this reason, when connecting polyvinyl chloride resin pipes with an adhesive, it is necessary to keep both pipes stationary until the adhesive is cured, but the on-site construction work is shortened. Is required, the following pipe connection work may be performed while the adhesive does not cure, and the joint surface between the receiving port and the outlet port shifts or moves to obtain sufficient adhesive strength and water tightness. There was nothing. [0005] As means for solving this problem, Japanese Patent Application Laid-Open No. 9-159071 discloses
It has been proposed to provide a concave groove and a convex ridge that mutually engage in the joint surface of the socket and the spout, but in the engagement of the concave groove and the convex ridge, the joint surface of the socket and the spigot is shifted, It cannot be reliably prevented from moving. In particular, when molding a socket or a spigot at the end of the synthetic resin tube, dimensional variations are likely to occur, and if the fitting of the concave groove and the ridge becomes loose during connection, a sufficient locking effect cannot be obtained, Conversely, if the fitting is too tight, a problem may occur that the groove and the ridge cannot be fitted. The inventor of the present application has paid attention to such a problem, and has achieved the result of intensive studies. Absorbing dimensional variations in the manufacturing process, bonding can be easily performed, and moreover, it is reliable and reliable. It is an object of the present invention to provide a synthetic resin pipe capable of obtaining a strong joint. According to the present invention, there is provided a synthetic resin pipe having a receiving port provided at one end of a synthetic resin pipe and a spigot port provided at the other end thereof. In the first half, a plurality of locking projections having a slope with a smaller inner diameter from the opening side toward the back and a step at the back end of the slope are provided, and each of the locking projections extends from the opening side to the back. Formed in a state protruding gradually toward the inner circumference,
Further, a tapered joint surface having an inner diameter gradually reduced toward the back is provided at a deep portion of the locking projection, and a tapered joint provided at a deep portion of the receiving port is provided at a distal end side of the spigot outer peripheral surface. A plurality of tapered joint surfaces are provided to be in contact with the surface via an adhesive, and a plurality of inclined surfaces and hooked step portions are fitted and locked to the plurality of locking projections behind the tapered joint surface. It is provided with a locking groove. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a half sectional view of a synthetic resin pipe showing one embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a main part of a receptacle, and FIG. 3 is an enlarged sectional view showing a main part of a spigot. The synthetic resin pipe of the present invention is provided with a receiving port 2 at one end of a synthetic resin pipe 1 made of vinyl chloride resin or the like and a spout 3 at the other end. Then, the spigot 3 of the other synthetic resin tube 1 is inserted into the socket 2 of one synthetic resin tube 1 and connected via an adhesive. An inclined surface a having a smaller inner diameter from the opening side to the back is provided on a front half portion of the inner peripheral surface of the receiving port 2 on the opening side.
1 and a locking projection 21 having a stepped portion b1 at the inner end of the inclined surface a1.
A locking projection 22 having an inclined surface a2 and a stepped portion b2 which is hooked on the inner end of the inclined surface a2 is provided on the rear side of the inclined surface a2. An inclined surface a3 is provided on the inner side of the innermost locking projection 22, and a tapered joint surface whose inner diameter gradually decreases continuously from the innermost end of the inclined surface a3 to the inner portion of the receiving port. 20 are provided. The inclination of the tapered joining surface 20 is preferably set to about 1 to 3 degrees with respect to the tube axis. Although the drawing illustrates the receptacle 2 provided with the two locking projections 21 and 22, the present invention is not limited to this, and three or more may be provided. The inclined surface a forming the locking projections 21 and 22
Preferably, 1, a2 and the inclined surface a3 are set at about 5 ° with respect to the tube axis, and the catching steps b1, b2 are preferably set at about 90 ° with respect to the tube axis. The locking projections 21 and 22 are formed so as to gradually protrude toward the inner side from the opening side to the inner side. In other words, the surface connecting the deep ends of the inclined surfaces a1, a2 and the inclined surface a3 is almost the same as the gradient of the tapered joining surface 20 provided in the inner part of the socket, or slightly more steep. It is set to be. On the other hand, a tapered joining surface 30 is provided on the distal end side of the outer peripheral surface of the spigot 3. This tapered joint surface 3
0 is a tapered joining surface 20 provided at the back of the port 2
And an abutment with an adhesive.
Similarly to the above, the inclination angle is set to about 1 to 3 ° with respect to the pipe axis. Behind the tapered joining surface 30, an inclined surface c3 which comes into contact with an inclined surface a3 provided on the inner peripheral surface of the receiving port.
Are provided, and locking grooves 31, 32 are further provided behind the inclined surface c3. The locking grooves 31 and 32 are fitted and locked with the locking projections 21 and 22 provided on the receiving port 2, and the inclined surfaces c1 and c2 forming the locking grooves 31 and 32 are locked. The projections 21 and 22 are formed with the same gradient as the inclined surfaces a1 and a2. Also, the catching step d
1, d2 is a catching step b1, of the locking projections 21, 22;
Like b2, it is formed so as to be around 90 ° with respect to the tube axis. When piping is performed using this synthetic resin pipe, an adhesive is applied to the inner peripheral surface of the receiving port of one of the pipes, the outer peripheral surface of the receiving port of the other pipe, or both the inner peripheral surface of the receiving port and the outer peripheral surface of the receiving port. Is applied, and the two pipes are firmly joined simply by inserting the spigot into the receptacle. That is, the socket 2 and the outlet 3 of the synthetic resin pipe
Is provided with a plurality of locking projections (locking grooves) and a tapered joint surface, but the opening is generally wider on the opening side, and the spigot is tapered. Therefore, insertion of the spigot 3 into the receptacle 2 can be performed very easily. Further, since the structure is such that the fitting becomes tighter as the insertion becomes deeper, the dimensional error is absorbed even if the receptacle 2 and the spigot 3 have dimensional variations, and a strong joint can be obtained. Further, a fitting engagement portion for preventing displacement and movement of the joining surface and a tapered joining surface for ensuring watertightness by adhesive joining are provided on the inner peripheral surface of the receiving port and the outer peripheral surface of the spout. Are provided separately, and a tapered joint surface formed by adhesive joining is provided in the inner part of the receiving port which is closest to the fluid in the pipe, so that leakage of the fluid in the pipe is reliably prevented. As described in detail above, the use of the synthetic resin pipe of the present invention makes it possible to easily perform pipe installation on site, to obtain a reliable and strong joint, and to greatly shorten the installation time. Can be shortened.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a synthetic resin pipe showing one embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a main part of a socket according to one embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view showing a main part of a spigot according to an embodiment of the present invention. [Description of Signs] 1 Synthetic resin pipe 2 Receptacle 3 Spacing 20 Taper-shaped joint surface 21, 22 Locking projection 30 Tapered joint surface 31, 32 Locking groove

Claims (1)

Claims: 1. A synthetic resin pipe provided with a receiving port at one end of a synthetic resin pipe and a spigot port at the other end thereof.
In the front half of the opening on the inner peripheral surface of the receptacle, an inclined surface having a smaller inner diameter from the opening side to the back and a plurality of locking projections having a stepped portion hooked at the inner end of the inclined surface are provided. The stop projection is formed so as to gradually protrude toward the inner side from the opening side to the back, and a tapered joining surface whose inner diameter gradually decreases toward the back is provided at the back of the locking protrusion, On the other hand, a tapered joining surface that is in contact with a tapered joining surface provided at the back of the socket at the front end side of the spout outer peripheral surface through an adhesive is provided, and the tapered joining surface is provided behind the tapered joining surface. A synthetic resin pipe provided with a plurality of locking grooves each having an inclined surface and a catching step, which are fitted and locked with the plurality of locking projections.