Abstract
This installment is the displacement stick in the foundation piles static load testing method. The primary displacement stick is replaced by the reinforcing steel bar and add the protecting cannulation in exterior. But this method needs very long steel tube, and the expense is very big. Therefore in this foundation we should redesign simple and cheap installment. We can use steel wire in stead of the reinforcing steel bar overpass the interior of the plastic water pipe. Then the original needs of more than 20 meters long steel tube can be replaced by less than 1 meter. The various components of the device compose a whole, so it can greatly reduce the economic costs and construction difficulties, and so on. At the same time, this paper detailedly describes the computation process of the bearing capacity after the completion of the installment.
Key words: displacement; economic cost; component; the bearing capacity
