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美国一家工程公司发明了自上而下的建筑法。此法不但节省了时间,而且减少了建筑费用。这种建筑法,是先在工地的两端插上四周宽可容电梯的钢架,高度与所拟兴建的大楼相等,然后工人在钢架下,以与大楼面积相等的钢板上敷上四英寸厚的水泥,用吊车沿钢架将钢板吊上顶岸,这样顶层就完工了。工人不必等待水泥干涸,即可在钢架下叠好的多层钢板上的最上层再铺上水泥,用吊车将它拉上去,这样最上一层楼的骨架便完
An engineering company in the United States invented the top-down construction law. This method not only saves time, but also reduces construction costs. The construction method is to insert a steel frame at four ends of a wide, elevator-accessible structure at both ends of the site at the same height as the building to be constructed. The workers then place the steel plate under the steel frame four inches above the building area Thick cement, with a crane along the steel plate hanging on the top of the plate, so the top is completed. The workers do not have to wait for the cement to dry up, and then cement the top of the multi-layer steel sheets stacked under the steel frame and pull it up by the crane so that the skeleton of the uppermost floor ends