SJ工法による継手性能の最適化について (粉末冶金<小特集>)
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概要
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Recently, in the building business circle, with the progress of reinforced structure of getting bigger and higher the strength and diameter are changing and furthermore, the prefabricating method is being adopted for energy saving of reinforced work.Accordingly, mechanical joints of high reliability are required.The writer et al developed squeeze joint method which is a mechanical jointing method of deformed bars.The squeeze joint is carried out with a thickwalled steel tube sleeve which is squeezed onto the deformed bar by a die.In this paper, it has been clarified that optimum vaiues of 3 elements (reduction ratio, section ratio and sleeve length) in SJ function are 0.85, 1.25 and 5 knots of deformed bar respectively.From results written here under it was confirmed that this SJ joint fully satisfied joint judgement standard "A" by RPCJ committee.The test results of squeeze joint performance are as follows:1) Tensile strength is higher than JIS standard strength of reinforced deformed bar2) At 0.95σyB: Joint E'>0.7E3) At 0.70σyB: Joint E'>E4) Residial elongation at (0.95σyB→"0"): <0.3mm5) At max. load: Elongation>3%6) After 20 times load reversals of 95%σyB tesion and 0.5σyB compression: Joint E'>0.5E
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