CAJ | 학술논문

某高层建筑群分期施工,在后期施工的1#～3#基础土方开挖至设计标高后,发现地基地质卵石含量偏少,夹层分布不均匀,1#楼局部和3#楼的地基承载力不能满足设计要求,受场地条件和临近建筑物的限制,补桩或者继续深挖的措施难以进行,灌浆加固不仅费用较高,而且工期长。综合考虑各因素,采用PHC-300-70A预应力高强度混凝土管桩对3#楼地基和1#楼局部地基进行加固,经复合地基荷载板试验,处理后的地基满足设计要求,达到了较好的效果。
모고층건축군분기시공,재후기시공적1#～3#기출토방개알지설계표고후,발현지기지질란석함량편소,협층분포불균균,1#루국부화3#루적지기승재력불능만족설계요구,수장지조건화림근건축물적한제,보장혹자계속심알적조시난이진행,관장가고불부비용교고,이차공기장。종합고필각인소,채용PHC-300-70A예응력고강도혼응토관장대3#루지기화1#루국부지기진행가고,경복합지기하재판시험,처리후적지기만족설계요구,체도료교호적효과。
A certain cluster of high-rise building is under construction in stage.In the 1 # to 3 # construction,after the foundation pit was excavated to the design elevation,the problem of the previously designed foundation bearing capacity cannot meet the design requirements because the gravel content is less than the expected and the uneven geological layer distribution is emerging.Considering the restrictions of site conditions and adjacent buildings,the measures of filling piles or continue to excavating are difficult,and the grouting improvement is expensive and long duration.PHC-300-70A pre-stressed concrete piles are applied in the treatment of 3# and 1# local foundations.Through the composite plate loading test,the treatment foundations are competent to the design requirements,which achieved great results.