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在江、河中进行钻探,首先要预防水上事故。1991年5月,我队工程钻探1号机为丽水市碧湖镇公路大桥进行工程地质勘察,钻探施工中发生一起沉船事故。笔者就这次事故发生的原因及应吸取的教训,作一粗浅分析,供同行参考。1.施工概况该大桥设计桥址中轴线长1300m(包括引桥),水面宽400m,上游已建成两座水电站,开闸发电时高河漫滩大部分被水淹没。心滩约100×500m,位于主河床右侧,平水期露出水面。河床平水期宽300m。主河道位于左侧,宽150m,河水流速小于2m/s。按设计,沿桥址中轴线钻9个孔,
In the river, the river for drilling, we must first prevent water accidents. May 1991, I team engineering drilling machine No. 1 for Bihu Town, Lishui City Bridge engineering geological survey, drilling accident occurred in a shipwreck. The author on the cause of the accident and should learn from the lessons for a superficial analysis for peer reference. 1. Construction Overview The bridge design of the bridge axis 1300m long (including the approach bridge), the water surface width 400m, the upper reaches of the completion of two hydropower stations, most of the floodplain floodgate flood was submerged. Heart Beach about 100 × 500m, located on the right side of the main river bed, flat water exposed surface. Riverbed flat water 300m wide. The main channel is located on the left side, 150m wide and the velocity of the river is less than 2m / s. According to the design, drill 9 holes along the bridge axis,