后植筋拔出法在混凝土强度技术检测中的应用
2021-11-02刘波刘磊
刘波 刘磊



摘 要:通过使用后植筋拔出法得到不同强度等级混凝土的拉拔力,其中主要介绍了后植筋拔出法的操作方式;另外,还通过抗压强度实验获取不同强度等级混凝土的强度。实验完成之后即可获得不同强度等级混凝土的拉拔力和抗压强度,然后通过归纳法对这些数据进行分析,利用回归方式得到混凝土强度和拉拔力之间的曲线,并且对曲线的精确度进行检测,结果表明,在混凝土强度技术检测中使用后植筋拔出法获得的回归方程具有可行性,在一定条件下能够有效根据拉拔力计算出混凝土强度。
关键词:后植筋拔出法;混凝土;强度;检测
中图分类号:TU37 文献标识码:A 文章编号:1001-5922(2021)10-0098-05
Application of Post-planting Bar Pull-out Method in Concrete Strength Technical Inspection
Liu Bo, Liu Lei
(Jiangsu Design Institute of Geology for Mineral Resources(Testing Center of China Coal Geology Bureau),
Xuzhou 221006, China )
Abstract:The paper uses the post-planting bar pull-out method to obtain the pull-out force of different strength grades of concrete, which mainly introduces the operation method of the post-planting bar pull-out method; in addition, the strength of different strength grades of concrete is obtained through the compressive strength experiment . After the experiment is completed, the pull-out force and compressive strength of concrete of different strength grades can be obtained, and then these data are analyzed by induction method, and the curve between concrete strength and pull-out force is obtained by regression method, and the accuracy of the curve is obtained. The test results show that the regression equation obtained by the post-planting bar pull-out method in the concrete strength technical test is feasible, and the concrete strength can be effectively calculated based on the pull-out force under certain conditions.
Key words:post-planting bar pull-out method; concrete; strength; detection
當前,中国混凝土强度检测技术主要有两种类型,分别为半破损检测和非破损检测,半破损检测技术主要有钻芯法、拔出法等,非破损检测的技术主要有回弹法、超声回弹法、超声法等[1-3]。每一种混凝土强度检测技术各有优缺点,预埋拔出法和后装拔出法对混凝土强度检测具有一定作用,但是预埋拔出法不能对现场混凝土强度进行检测,所以在使用上会受到比较大的限制,后装拔出法碰到坚硬的粗骨料会加大切槽难度,会增加尺寸的偏差,从而影响到检测精度[4-5]。所以使用拔出法对混凝土强度进行检测存在比较多的问题,于是就会限制其广泛应用[6]。不管是哪一种拔出法,都希望最后是混凝土出现破坏,而拔出锚固件不会发生破坏。……
