| 摘要 |
PURPOSE:To obtain a steel pipe pile having not thermal strain by releasing the thermal strain by cutting a supporting beam after welding a joint pipe part and supporting beam by adding a reverse strain to a main body pipe part, and joining the cut part by welding by holding the supporting beam side of the main body pipe in roundness again. CONSTITUTION:A strain giving member 3 is fitted in the right angled direction for the direction of the welding position of both joint pipe parts 2 into the inner faces at both ends of the main body pipe part 1 in a round shape. In the sate of giving the reverse strain equivalent to the deformation amt. by the welding of the joint pipe part 2 and supporting beam 4 to the main body pipe part 1, the joint part 2 and supporting beam 4 are thus welded in order. The strain giving member 3 is removed in succession, the supporting beam 4 is cut at the vicinity 4a of the center line in the longitudinal direction and the welding thermal strain of the main body pipe part 1 is released. The main body pipe part 1 joins the cut part 4a by its welding with holding the end part at the supporting beam 4 fitting side in roundness thereafter. The steel pipe pile having no thermal strain can thus be manufactured and the driving productivity at the working site is improved.
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