某小高层纠倾加固技术

某11层钢筋混凝土结构房屋,因地基不均匀沉降,导致房屋整体向东北方向发生倾斜。房屋东北角点最大累计沉降量为111.33mm,最大倾斜量为6‰,不满足设计规范要求,需进行纠倾处理。结合该房屋的地质条件和上部结构情况,先在房屋北侧设置一定数量的锚杆静压桩使房屋沉降趋于稳定后,在房屋南侧布置扰动孔,对筏板基础底部的碎石垫层进行扰动,使房屋南侧迫降,从而达到纠倾的目的。待房屋回倾至设计值后,采用地基压密注浆对地基进行防覆倾加固处理。通过对该房屋倾斜原因的分析、纠倾方案的选取、纠倾设计及施工操作等方面进行较详细的叙述,可供同类建筑纠倾参考。

RECTIFICATION OF AND REINFORCING TECHNOLOGY A LOW HIGH RISE BUILDING

An overall housing tilt to the northeast occurred on a 11-story reinforced concrete building, due to uneven settlement of its foundation, and the maximum cumulative settlement amount of 111.33 mm occurred at the northeast point of the building, maximum tilt amount was 6‰, which could not meet the requirements of the code, so a tilt-correction was needed. In conjunction with geologic conditions of the housing and the situation of superstructure, a certain number of static Bolt-pressing piles were set on the north side to stabilize the housing settlement; then the disturbing holes were arranged on south side of the building to disturb the gravel layer at the bottom of the raft foundation, so that housing south was forced to lower, so as to achieve the purpose of correcting tilt, after returning to the design value of the building, the pressure grouting was used to reinforce the foundation. In this paper, analysis of the causes of the housing tilt, tilt correction program selection and correct operation, as well as its design and construction were described in detail.