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由水电三局和交通部公路科学研究所合作,用国产紧固设备,经过三年多的努力,研制成功适用于检测硬化混凝土强度的射钉新技术,最近通过技术鉴定,获得同行专家一致好评。此项研究成果表明: 1.射钉外露长度与混凝土立方体抗压强度、混凝土梁抗折强度之间存在良好的相关关系(r=0.83～0.89)。 2.在相同条件下,射钉外露长度与混凝土芯样强度之间的相关性,达到混凝土芯样抗压强与立方体抗压强度之间相关性相同的水平(r=0.85～0.86),与国外“Windsor”射钉试验的效果相同。
In cooperation with the Bureau of Highway Research of the Ministry of Transport and the Ministry of Transport, and using domestically-made fastening equipment, after more than three years of hard work, it successfully developed a new nailing technique that is suitable for detecting the strength of hardened concrete. It has recently passed technical appraisal and obtained consistent acclaim from peer experts. . The results of this study indicate that: 1. There is a good correlation between the exposed length of the nail and the compressive strength of concrete cubes and the flexural strength of concrete beams (r = 0.83 to 0.89). 2. Under the same conditions, the correlation between the exposed length of the nail and the strength of the concrete core, to achieve the same level of correlation between the strength of the concrete core and the cubic compressive strength (r = 0.85 ~ 0.86), and The effect of the “Windsor” nailing test abroad is the same.