在打桩工程中,有时会发生这种情况,即用一般打桩机具和一般打桩方法,都不能将桩打至设计深度。推其原因,可能系由下列各种因素所造成: 1.使用的打桩机具能力过小,不能满足沉桩的技术耍求。 2.土壤很密实,或土壤中具有个别不厚的但非常坚硬的土层及石质土层。 3.在沉桩过程中,桩尖处遇有大漂石或其他障碍物。 4.在高桩承台工程中,当河床冲刷淤积变化很大, In piling works, it sometimes happens that with normal piling machines and normal piling methods, the piles can not be pumped to the design depth. The reason for pushing may be caused by various factors as follows: 1. The piling equipment used is too small in capacity to meet the technical requirements of pile driving. 2. Soil is very dense, or the soil has a few are not thick but very hard soil and stone soil layer. 3. In the pile sinking process, the pile tip encounter large boulders or other obstacles. 4. In the high pile cap project, when the river bed scouring sediment changes greatly,