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近年来,中国建筑第一工程局科研所吸取国内外经验,结合我国国情,研制了一种新型实用的电动拉拔仪。通过大量试验,对受拉拔混凝土的破坏机理进行了研究,确定了拉拔力和混凝土抗压强度的关系。深入研究了影响拉拔力的多种因素,提出了相应修正系数,制定了技术要求,形成了一套完整的测试体系,在国内首次将该法引入轻骨料混凝土的强度测试中。采用预埋法和后装法,操作简便,检测精度高,设备便宜,技术容易掌握,便于
In recent years, the Research Institute of China Construction First Engineering Bureau has learned domestic and foreign experience and developed a new type of practical electric drawing instrument in combination with China’s national conditions. Through a large number of tests, the failure mechanism of the drawn concrete was studied, and the relationship between the pull-out force and the compressive strength of the concrete was determined. In-depth study of a variety of factors affecting the pull-out force, proposed the corresponding correction factor, formulated the technical requirements, and formed a complete set of testing system, which was first introduced into the strength test of lightweight aggregate concrete in China. The pre-embedding method and the post-installation method are used, the operation is simple, the detection accuracy is high, the equipment is cheap, and the technology is easy to grasp.