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净跨7～12米装配式钢筋混凝土桥梁上部结构,一般多采用T形梁或宽腹梁(矮T梁)等为主。T形梁的构件高,如净跨10～12米的T梁高度,就达1米左右。在平原水网地区路基做得低的桥梁,使用T梁,就得大大提高桥头接线高度,在必须保证桥下通航净空的情况下,提高的土方数量更大。特别是旧桥改造由于加高接线,不得不废弃原有老路面,加上取土困难须远运土方,因而很不经济。同时,提高桥头接线高度,就得多占良田,对支农的意义来说,也是不符合的。为了解决这些问题,最近我们正在试建净跨10米及12米按极限状态计算的装配式钢筋混凝土空心版梁桥(采用纵向开孔,孔成椭圆形)降低了上部构造的高度。
Net span 7 ~ 12 meters of prefabricated reinforced concrete bridge superstructure, the general use of T-beams or wide web (short T-beam) and so on. T-beam components, such as the net span of 10 to 12 meters of T-beam height, up to 1 meter. In the plain water network, the subgrade is used as a low bridge, the use of T-beam, you have to greatly improve the height of bridge connection, must ensure that under the bridge navigation clearance, the greater number of earth mills. In particular, the transformation of the old bridge due to heightening the connection, had to abandon the old road, coupled with difficulties in obtaining earthwork earthwork, it is not economical. At the same time, to increase the height of the bridgehead connection, it is necessary to make up more fertile land, which is not in line with the significance of supporting agriculture. In order to solve these problems, recently, we are trying to build a prefabricated reinforced concrete hollow girder bridge (using longitudinal holes and oval holes) with a net span of 10 meters and 12 meters in the limit state to reduce the height of the superstructure.