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難度又大，我們又采用了下面控制立柱頂面高度的方法。
its very difficult, so we use the following method to control the ht= of the top of the column.
先以路面設計標高算出路緣石頂面設計標高。
first, the design elevation of the top of the curb is calculated based on the design elevation of the pavement.
再根據立柱頂面應高出路緣石頂面70cm算出立柱頂面標高。
then calculate the top elevation of the column according to that the top of the column should be 70cm higher than the top of the curb.
然后打入立柱時，對每根立柱進行測量。
then, when driving the column, measure each column.
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