由于顶管两侧地质条件差，工作井和接收井平面尺寸大，选择合适的施工技术显得尤为重要。
It is more important to choose suitable construction technology owing to poor geological conditions and large dimensions in terms of operation shafts and receiving shafts.
为安装并固定钢牛腿千斤顶的工作平面提供了保证；同时也提出了其它可行的设计方案．以期为考虑支座更换的桥梁设计提供参考。
When the bearing should be replaced, the steel bracket is installed by fastening bars through the pipes, The bracket can be taken as the working plane to jack up the beams.
双导堤平面布置不宜呈突然扩大或收缩状，堤顶高程宜与中潮位一致。
In the plane layout of double dikes, the sudden expansion or contraction should be avoided. The elevation of the top of the dike should be identical with middle tide level.
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