大涌水地段的接触网基础施工

杭州站的地质情况非常特殊.该站第17道(沪杭线下行正线)有11个双线路腕臂钢柱基础,经开挖基坑后测得,距地面600mm以下直至河床面全部为抛填片石,按原设计开挖,则基坑内积水达800mm.用2台三相水泵和5台单相水泵同时抽水,水面下降100mm后就不再下降.经多次现场勘察、论证,同时查阅了混凝土施工的有关资料后,决定采用在水中进行浇注接触网基础的混凝土施工方法.

The Construction of OCS System Groundwork in The Bigger Gushing Water District

The geological state of Hangzhou Station is very special. There are 11 wrist-arm steel pole foundation within double lines in the 17th path of this station (The down-bound main track of Hu-Hang railway). After digging basal pit, we found that many piece of rocks were filled between 600 mm below the ground and the surface of river-bed, and the distance between water surface and basal subface is 800 mm. To pump water with 2 triphase water pumps and 5 monophase water pumps simultaneously, the water surface kept constant when it descended 100mm. Because of this state, we decided to adopt the concrete construction method which sprayed and poured OCS foundation in water after exploring and demonstrating repeatedly and looking up the information about concrete construction at the same time.