关键词: 预应力管桩, 偏位, 上浮, 纠偏, 灌芯, 沉降

Abstract:

Based on an engineering example, the reason of the sloping prestressed pipe pile (PPP) and the treatment method for the sloping PPP were given. First of all, the sloping condition of each pile should be made clearly, then the damaged position of every pile is clarified with low strain dynamic test; and at last the pertinence treatment measures are brought forward. It can be concluded that for the piles with pile shafts floating upward, they can be re-pressed; for the piles with serious pile top slopes and rupture of the pile shafts, they must be replaced by bored piles; for the piles with smaller pile top slopes and soundness of the pile shafts, they can be directly used after rectification and righting; for the piles with bigger pile top slopes and defect of the pile shafts, the first step is rectification and righting; and then strengthening the pile shafts by placing reinforcement cage and pouring concrete in the cores of the piles; and for the treated piles with lower bearing capacity, the bearing capacity of the bearing platform should be strengthened by adding bored piles. The measured settlement of building is small and uniform, and the maximum settlement is only 9 mm.

Key words: prestressed pipe pile, slope, floating upward, rectification, pour concrete in core of pile, settlement