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问题:(1)施工中遇到障碍物,沉桩深度达不到设计要求;(2)砂层摩擦力过大,桩身穿过中~密实砂层时发出嘟嘟响声,沉桩困难;(3)卵砾石层厚度或密实度不均匀,卵砾石作为持力层被穿透。预防对策及处理方法:(1)卵砾石层用作PH C管桩持力层的适宜性。因卵砾石层、砂土层主要分布于山前?
Problems: (1) During the construction, obstacles are encountered and the pile sinking depth can not meet the design requirements; (2) When the friction of the sand layer is too large, the beep will beep and sink when it passes through the medium- (3) uneven gravel layer thickness or density, pebble as a holding layer is penetrated. Prevention and treatment methods: (1) pebble layer for PHC pipe pile holding layer suitability. Due to the gravel layer, the sand layer is mainly distributed in the piedmont?