千斤顶常作为各种测力或施力手段,如先张、后张预应力混凝土的张拉应力的控制、结构的检验、单桩的压力试验等。为了准确地控制压力、应力和张力,必须先求得准确的千斤顶读数方能达到试验准确目的。因此,用千斤顶作各种试验之前,必须通过检验。 Jacks are often used as a means of force measurement or force application, such as the control of the tensile stress of pretensioned and post-tensioned prestressed concrete, the inspection of structures, and the pressure test of a single pile. In order to accurately control the pressure, stress, and tension, an accurate jack reading must be obtained before the accurate test can be achieved. Therefore, before using the jack for various tests, it must pass inspection.