目前使用的露天长线台座有两种,一种是传统的素混凝土台座,另一种是预应力混凝土台座。后者因抗裂性好,可不设或少设横向伸缩缝,不仅能增加台座产值,而且能节约钢材,如湖南省怀化地区建筑工程公司混凝土制品厂宽15m,长70m的台座,采用了不设横向缝的预应力混凝土台座,与设横向缝的素混凝土台座相比,每年可增产产值2.85万元,节约钢材6.16t。因此,在混凝土制品厂应大力推广这种台座,只是临时 At present, there are two types of open-air long-term pedestals, one is a traditional plain concrete pedestal, and the other is a prestressed concrete pedestal. The latter, due to its good crack resistance, can eliminate or reduce the need for horizontal expansion joints. This not only increases the production value of the pedestal, but also saves steel materials. For example, the concrete construction plant in Huaihua District, Hunan Province, is 15m wide and 70m long. The pre-stressed concrete pedestal with transverse joints can increase production value by 28,500 yuan per year and save 6.16 tons of steel compared with plain concrete pedestal with transverse joints. Therefore, this kind of pedestal should be vigorously promoted in the concrete product factory, only temporary