长线台座法生产预应力砼构件是中、小型砼预制厂普遍推广应用的预应力砼构件生产工艺。目前我国绝大部分砼预制厂采用素砼台面,这种台面经长期使用后,表面受气候温差和基础沉降不均匀等因素的影响,使台面产生不规则裂缝和局部表面起壳、脱层以及因机械碰撞、砸伤所造成的损伤现象。在这种有损伤和裂缝的台面上生产砼构件底面就会产生鼓包和棱坎。由于素砼台面须设置横向伸缩缝,当春、秋季节生产时,由于昼夜温差的影响,往往导致跨缝上的砼构件产生表面裂缝,严重地影响了砼构件质量和砼预制 The long-term pedestal method for producing pre-stressed concrete components is a pre-stressed concrete component production process that is commonly applied in small and medium-sized precast plants. At present, the vast majority of prefabricated factories in China use Suyan countertops. After the long-term use of the countertops, the surface is affected by factors such as climate temperature differences and uneven base settlements, causing irregular cracks on the countertops and partial surface crusting and delamination. Damage caused by mechanical collisions and bruises. Drums and ridges are produced on the underside of the jaws that are produced on such damaged and cracked surfaces. Due to the need to install horizontal expansion joints on Suo’an countertops, when spring and autumn production, due to the influence of temperature difference between day and night, it often leads to surface cracks on the sill members across the joints, which seriously affects the quality of stumbling members and prefabrication.