1.预应力台面台座传统的长线台座台面多是由素混凝土或钢筋混凝土制作的,使用一段时间后,由于混凝土收缩、徐变及温湿度变化等的影响,台面就会产生横向裂缝。即使设有伸缩缝,也无法避免继续开裂。因此,给构件的生产质量带来严重的影响。使用预应力台面台座,则可妥善解决这一问题。预应力台面的具体做法是:先在混凝土垫层上设置有效的隔离层,再在上面浇筑一层先张法预应力混凝土台面。隔离层的作用是减小台面的约束应力,对台面施加 1. Prestressed table pedestals Traditional long pedestal table tops are mostly made of plain concrete or reinforced concrete. After a period of use, horizontal cracks will occur on the countertop due to concrete shrinkage, creep, and changes in temperature and humidity. Even with expansion joints, cracks cannot be avoided. Therefore, it has a serious impact on the production quality of components. The use of prestressed table pedestals can properly solve this problem. The concrete approach of prestressed countertops is to first set an effective insulation layer on the concrete cushion and then pave a layer of pretensioned prestressed concrete table top on the concrete cushion. The function of the isolation layer is to reduce the constraint stress of the mesa and apply it to the mesa.