Method for producing spiral pipe

摘要

In an embodiment, a long reinforcing material-attached profile strip (100) in which joint portions are formed at both side edge portions and to which a reinforcing material continuously formed in the longitudinal direction is attached is supplied, and mutually adjacent joint portions are joined to each other, thereby producing a spiral pipe (S). A curl-forming apparatus (3) includes a sending roller for the reinforcing material-attached profile strip (100) and a curl guide. Using the curl-forming apparatus (3), adjacent parts of the reinforcing material-attached profile strip (100) are subjected to plastic deformation to form spirals by being provided with arc-like curls having a radius of curvature substantially similar to or not greater than the radius of curvature of the spiral pipe (S). Accordingly, the spiral pipe (S) can be produced while suppressing the action of a restoring force that restores the reinforcing material-attached profile strip (100) to its original radius of curvature.

主权项

1. A method for producing a spiral pipe, comprising:
disposing the pipe-producing machine in a manhole; separately disposing a curl-forming apparatus on an upstream side of the pipe-producing machine, the curl-forming apparatus including: an arc-like plate so as to configure a part of a spiral; and a support base; placing the support base on a ground near the manhole or on a bottom portion inside the manhole; placing a reinforcing material-attached profile strip in which joint portions are formed at both side edge portions and to which a reinforcing material continuously formed in a longitudinal direction is attached, along a concave surface of the arc-like plate; pushing or taking the reinforcing material-attached profile strip, providing arc-like curls having a radius of curvature substantially similar to or not greater than a radius of curvature of a spiral pipe, and subjecting the reinforcing material-attached profile strip to plastic deformation to form a spiral; joining the joint portions of adjacent parts of the reinforcing material-attached profile strip, using the pipe-producing machine having a joining mechanism, thereby producing a spiral pipe; and revolving the pipe-producing machine about an axis of the spiral pipe in the manhole, and drawing or pressing the spiral pipe in a state where the spiral pipe is not removed from the pipe-producing machine, and thereby inserting the spiral pipe into an existing pipe without being wound, wherein the pipe-producing machine never proceeds into the existing pipe.