压桩掏土技术在软土地基危房纠偏中的应用

对位于上海软土地区某6层砖混住宅采用压桩掏土法纠偏。常规压桩纠偏,先在建筑物较大一侧压桩、封桩;再在建筑物沉降较小一侧掏土纠偏,并在掏土一侧设置少量保护桩,提高建筑物回倾后的稳定性。在该工程的施工过程中,将沉降较大一侧的压桩和沉降较小一侧的掏土纠偏同时进行,并推迟沉降较大一侧的封桩,既缩短了工期,又减小了桩顶的附加应力,同时房屋的附加沉降也控制在允许范围内,取得了较好的纠偏效果。

APPLICATION OF STATIC BOLT-PRESSING PILE AND DRAWING OUT SOIL IN DRILLING HOLE FOR DEVIATION RECTIFICATION OF INCLINED BUILDINGS IN SOFT GROUND

The design and construction process of rectifying deviation of a six-story masonry building in Shanghai are presented. For traditional inclination rectification method of static bolt-pressing piles and drilling and drawing out soil, the piles are first jacked by anchor rods in the side of a building with larger settlement, then soil is drilled and drawn out in other side of the building. When the inclination building is rectified, some piles are jacked in the other side to prevent building from inclining. In this project, the piles were jacked while soil was drilled and drawn out. This shortened the construction time, and reduced the additional stress at pile top. And the additional settlement of building was allowed.