Corrugated spiral pipe joint, corrugated spiral pipe provided with the joint, producing method therefor, and method of connecting a corrugated spiral pipe to the corrugated spiral pipe

A corrugated spiral pipe provided with a joint, comprising:

• a joint configured so as to include:
• an inner circumferential surface which is cylindrical and larger than an outer circumferential diameter of a peak portion of a corrugated spiral pipe to be coupled;
• an annular projection which is formed at a portion near a center in an axial direction of said joint so as to project into an inner circumferential direction;
• a base portion which is located on one side of said annular projection and constituted by a first cylindrical portion, a spiral projection engageable with a spiral corrugation of said connected corrugated pipe, and a second cylindrical portion;
• ring-like sealing bodies which are formed of compressible and transformable materials and bonded on the inner circumferential surface of said first and second cylindrical portions, respectively;
• a small hole for injection of a hardening liquid agent, which is formed in a portion of said base portion between said sealing bodies so as to penetrate said base portion;
• and a tip end projecting portion located on the other side of said annular projection;
• said corrugated spiral pipe to be coupled, which is made of synthetic resin and which includes:
• an outer circumferential surface formed into a spirally corrugated shape;
• and a pipe end which is inserted into said base portion of said joint;
• and
• a hardened matter of said hardening liquid agent filled in a space portion which is surrounded by said outer circumferential surface of said pipe end, said inner circumferential surface of said base portion of said joint, and said ring-like sealing bodies, so that said joint is water-tightly coupled with said pipe end of said spiral pipe.

A method of producing a corrugated spiral pipe provided with a joint, comprising the steps of:

• preparing a joint which includes:
• an inner circumferential surface which is cylindrical and larger than an outer circumferential diameter of a peak portion of a spiral pipe to be coupled;
• an annular projection which is formed at a portion near a center in an axial direction of said joint so as to project into an inner circumferential direction;
• a base portion which is located on one side of said annular projection and constituted by a first cylindrical portion, a spiral projection engageable with a spiral corrugation of said connected corrugated pipe, and a second cylindrical portion;
• ring-like sealing bodies which are formed of compressible and transformable materials and bonded on the inner circumferential surface of said first and second cylindrical portions, respectively;
• a small hole for injection of a hardening liquid agent, which is formed in a portion of said base portoion between said sealing bodies so as to penetrate said base portion;
• and a tip end projecting portion located on the other side of said annular projections;
• inserting a pipe end of a synthetic resin corrugated spiral pipe having a spirally corrugated outer circumferential surface into said base portion of said joint while said spirally corrugated outer circumferential surface of said spiral pipe is engaged with said spiral projection of said joint;
• and
• injecting a hardening liquid agent through said small hole for injection of a hardening liquid agent into a space portion surrounded by an outer circumferential surface of said pipe end, said inner circumferential surface of said base portion of said joint, and said ring-like sealing bodies so that said space portion is filled with a hardened matter of said hardening liquid agent to thereby make said joint be water-tightly coupled with said pipe end of said spiral pipe.

A method of connecting a second corrugated spiral pipe to a first corrugated spiral pipe provided with a joint, comprising the steps of:

• preparing said first corrugated spiral pipe provided with the joint which include:
• the joint including an inner circumferential surface which is cylindrical and larger than an outer circumferential diameter of a peak portion of a corrugated spiral pipe to be coupled;
• an annular projection which is formed at a portion near a center in an axial direction of said joint so as to project into an inner circumferential direction;
• a base portion which is located on one side of said annular projection and constituted by a first cylindrical portion, a spiral projection engageable with a spiral corrugation of said connected corrugated pipe, and a second cylindrical portion;
• ring-like sealing bodies which are formed of compressible and transformable materials and bonded on the inner circumferential surface of said first and second cylindrical portions, respectively;
• a small hole for injection of a hardening liquid agent, which is formed in a portion of said base portion between said sealing bodies so as to penetrate said base portion;
• and a tip end projecting portion located on the other side of said annular projection;
• said corrugated spiral pipe to be coupled, which is made of synthetic resin and which includes:
• an outer circumferential surface formed into a spirally corrugated shape;
• and a pipe end which is inserted into said base portion of said joint;
• and a hardened matter of said hardening liquid agent filled in a space portion which is surrounded by said outer circumferential surface of said pipe end, said inner circumferential surface of said base portion of said joint, and said ring-like sealing bodies, so that said joint is water-tightly coupled with said pipe end of said spiral pipe;
• pressing a block-like water sealing material having a sectional shape a little larger than a sectional shape of a valley portion of a pipe end portion of said second corrugated spiral pipe to be connected into said valley portion (d);
• fitting an elastic seal ring having an outer circumferential surface provided with a plurality of annular corrugations formed thereon onto an outer circumferential surface of said pipe and of said second spiral pipe so as to cover said block-like water sealing material;
• and
• pressing said pipe end into said tip end projecting portion of said joint.