在顶管施工中，千斤顶的支座需要巨大的反力支持，这些反力是由工作井的侧壁以及壁后土体提供的。
In construction of pipe jacking, the wall of working shaft and soil body behind the sidewall offers enormous supporting force to a lift.
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.
水平千斤顶支承在活动支座上并配套使用。
A horizontal jack is supported on the shifting bearing and is matched with the shifting bearing.
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