PURPOSE: To easily remove the top of a concrete pile by covering a hollow cylinder on the end portion of the iron bars at the top of the concrete pile.
CONSTITUTION: In the assembling work of iron bars, a hollow cylinder 3 is covered on the top portion 1' of the iron bars, and the whole of the iron bars inserted into a bored pit. Then, concrete is placed by an usual method into the bored pit and the top 4 of the concrete pile is exposed by digging out the soil around the top 4 of the concrete pile. Then, plural boreholes are formed in the top 4 of the concrete pile, concrete breakers 7 are then inserted into the boreholes 6, and the breakers 7 are operated to break the top 4 of the concrete pile. Then, foundation is placed on the end 1' as anchor of the iron bars by usual construction method. Thus, the top 4 of the concrete pile can be exactly broken by a comparatively weak force, making construction work easier and safer.
YAMADA MINORU
MIWA YASUTOSHI
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