| 摘要 |
PURPOSE: A combination-type pipe having a high joining force is provided to maintain a strong joining force and prevent the deformation of a pipe by combining the shape of first and second arc portions as a perfect circle shape without a distortion. CONSTITUTION: A combination-type pipe having a high joining force comprises a first combining portion(2a), a second combining portion(3a), a first arc portion(2) and a second arc portion(3). In the state that the part between first and second combining portions is cut in the longitudinal direction of the pipe, the first and second combining portion are combined to a rotational center point as a notch groove(1). The first and second arc portion is formed at a perfect circle shape.
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