| 摘要 |
PURPOSE:To quickly connect piles by once welding all the circumference of couplers by a method in which a round or angular fire cracker welding bar is attached to the couple of a pile, the couplers of upper an lower piles are contacted with each other, and electric current is supplied to the welding bar. CONSTITUTION:A large-diameter coupler 6 is provided to the upper end of a lower pile 4, and a round or angular fire cracker welding bar 3, matching with the peripheral shape of the pile 4, is attached to the upside of the coupler 6. The coupler 5 of an upper pile 4' is contacted with the coupler 6 of the pile 4 and electric current is supplied to the bar 3. All the circumferences of the couplers 5 and 6 can thus be welded at a time, and the piles can be quickly connected with each other.
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