每个建筑物开工之前都要测量放线。过去我们都是使用龙门板、龙门桩来控制中心线。后来因为采用了电动打夯机,以及有些基槽较宽,于是传统做法就不适用了。现在我们使用打小木桩的方法。具体做法是把桩打在距槽外边50～100厘米的中心线处,以控制两个方向,并根据地形把水平标高抄、画到木桩 Before each construction starts, measure the payoff. In the past, we all used gantry panels and gantry piles to control the centerline. Later, because of the use of electric slamming machines and some base slots, the traditional practice would not apply. Now we use the method of playing small stakes. The specific method is to shoot the pile at a center line 50 to 100 centimeters from the outside of the tank to control the two directions, and copy and draw the horizontal elevation to the stake according to the terrain.