一、前言 长线台座是生产先张法预应力混凝土构件的重要设备,以往沿用的台面多为素混凝土或钢筋混凝土,使用数年之后,常会出现裂缝,从而影响构件质量,严重者造成构件报废,因此台面裂缝问题就成为当前急待解决的问题。 I. Introduction The long-term pedestal is an important equipment for the production of pre-tensioned prestressed concrete components. In the past, most of the mesa used were plain or reinforced concrete. After several years of use, cracks often appeared, which affected the quality of the components, and severely caused the components to be scrapped. Therefore, the problem of cracks on the countertop has become a problem that needs to be solved urgently.