目前,全国预制混凝土构件厂,生产预应力混凝土构件,大都采用露天长线台座生产。台模长度一般在80～100m左右,为了防止热胀冷缩损坏混凝土台面,通常每隔8～10m设置一条伸缩缝。这样实际上是由数块短块组合而成的台模给混凝土构件生产带来一些问题。当构件跨越伸缩缝布置,昼夜温度差变化较大时,使制作不久的构件,随着台 At present, precast concrete component plants in the country, and prestressed concrete components, are mostly produced using open-air long-line pedestals. The length of the table mold is generally about 80 to 100 m. In order to prevent the thermal expansion and contraction from damaging the concrete table, an expansion joint is usually provided every 8 to 10 m. This is actually a combination of a number of short pieces of the table model to bring some problems to the production of concrete components. When components are arranged across expansion joints, and the temperature difference between day and night changes greatly, the components that are manufactured soon become