(57) Abstract Objective Guaranteeing the smooth expansion and contraction operation of the corner poleIt does. Constitution Flexible pipe 1 of each step which forms corner pole 1When 7 and 18 is taken as example, bottom rim of flexible pipe 18 insideTo provide welding ground plate 20, the top of flexible pipe 17 outsideStopper ring 27 is provided in circles lap. Flexible pipe 1 insideAt welding ground plate 20 adjacent upper part position of 8, when expanding strikeDrain hole 22 is provided in the position where it is piled up with tsuparingu 27.When flexible pipe 18 expands, the top end surface of welding ground plate 20Bottom surface and plane surface of stopper ring 27 of flexible pipe 17So this it touches, without gearing to stop, at the same time collar brace of flexible pipe 18The coming hole 22 being covered with stopper ring 27 of flexible pipe 17As for the water and the mud which it does not expose, go between both flexible pipes the drain hole 22And others it falls to the lower part.
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