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近几年来,在地下水位以下桩和基础采用电阻应变片进行应变测定。如1976年施工的上钢五厂一吨壳体锻锤基础,曾在下环梁和壳体内的九处钢筋上预埋了电阻应变片,虽经地下水的长期浸泡和锻锤冲击的影响,但于1978年进行动应变测定时,其中八处应变片的绝缘值仍在200兆欧以上,合格率为89％。又如在宝钢、淮南两地的钢筋混凝土电测桩中(宝钢桩长达45～60米,最深的测点承受6公斤/厘米~2的静水压力),在桩身的钢筋上曾贴了近
In recent years, strain gauges have been used to measure strains in piles and foundations below groundwater level. For example, the one ton shell forging hammer foundation of the No. 5 Plant of Shang Steel in 1976 was embedded with resistance strain gauges on the nine steel bars in the lower ring beam and the shell. Although it was influenced by the long-term immersion of groundwater and forging hammer impact, When the dynamic strain was measured in 1978, the insulation value of eight strain gauges was still above 200 megohms, and the qualification rate was 89%. Another example is in Baosteel and Huainan, where reinforced concrete electric measuring piles (Baosteel piles are 45 to 60 meters long, the deepest measuring point bears 6 kilograms/cm~2 hydrostatic pressure), and they have been attached to the steel reinforcements on the piles. near