一、问题的提出与分析我国中小型预制构件厂的桁条生产,多数采用长线台座生产工艺,立式拉模成型则是长线生产中一种比较先进的工艺。但现有的拉模工艺及设备仍存在着一些问题,特别是由于表面平板式振动器自由搁置于模板或物料上振动的方式,其振动能量大部分不能有效地直接传递给混凝土混合料,从而影响了振动效果。预应力混凝土桁条系薄壁细长构件,立式成组成型时,理论上用模板作为振动源直接振动混合料较为合理。首先,采用模板振 I. Proposal and Analysis of Problems The production of purlins in China’s small and medium-sized prefabricated component plants adopts long-term pedestal production technology. Vertical die-casting is a relatively advanced technology in long-term production. However, there are still some problems in the existing die-pulling process and equipment, especially because the surface plate-type vibrator is free to vibrate on the template or the material, and most of its vibration energy cannot be directly transmitted to the concrete mixture directly. Affect the vibration effect. When prestressed concrete purlins are thin-walled elongate members and they are vertically formed into a constitutive type, it is more reasonable to theoretically use a template as a vibration source to directly vibrate the mixture. First, the template vibration