1.前言为了直接评价砼构造物的质量,可以从构造物中直接钻芯取样来测定其抗压强度,但是我们知道钻取的圆柱试件的长度,会因所选取的构件的部位、试件的状态、试验的条件等不同而表示出不同的值。关于这些影响因素,历来根据不同情况,各个事例进行分别研究,但也有其它因素复合影响的情况,因此不一定能得出 1. Introduction In order to directly evaluate the quality of a concrete structure, a direct core sample can be taken from the structure to determine its compressive strength, but we know that the length of a drilled cylindrical specimen will vary depending on the location of the selected component The condition of the test piece, the condition of the test piece, etc., show different values. These factors have always been studied on a case-by-case basis and in different cases. However, there are other factors that may affect the situation. Therefore, it is not always possible to draw conclusions