电阻应变测试技术中,应变片对地(即对被测试件)绝缘是极为关键的问题。绝缘电阻能否满足基本要求,直接决定测试效果的好坏。在地下建筑工程中,钢筋混凝土结构物居多,常处于地下水,这样在测量地下构筑物的钢筋或混凝土内应力时,需要将应变片事先粘 In the resistance strain test technique, the strain gauge is critical to the insulation of the ground (ie, to the part under test). Insulation resistance can meet the basic requirements, directly determine the test effect is good or bad. In underground construction projects, most of the reinforced concrete structures are often in groundwater, so when measuring the internal stress of steel or concrete in underground structures, the strain gauges need to be glued in advance.