复杂环境下医院扩建工程深基坑设计与施工实例

Case Analysis of Design and Construction of Deep Foundation Pit for Hospital Expansion Project in Complex Environment

以山东省立医院儿科综合楼建设项目为例,深入探讨复杂环境下医院扩建工程深基坑设计的技术要点和施工过程中的关键控制点。该项目基坑深15.7~19.9 m,周边场地条件复杂,其中新建儿科综合楼距离东侧已建6层儿科病房楼仅3.2 m,综合考虑场地地层以及周边环境情况,基坑支护采用桩锚支护方案,地下水控制采用高压旋喷桩截水帷幕结合管井降水的方案。项目实施过程中对基坑以及周边建筑物进行全过程监测,监测结果表明,在该类型场地采用桩锚支护+高压旋喷桩截水帷幕+管井降水方案经济合理,保证了周边建筑的安全。施工时采取合理的工艺,最大程度降低施工期间对医院就医条件的影响。

Taking the construction project of Pediatric Comprehensive Building of Shandong Provincial Hospital as an example,the key technology in the design of deep foundation pit and the key control points in the construction process are discussed.The depth of the foundation pit is 15.7~19.9 m,and the surrounding conditions are complex.The newly built pediatric complex is only 3.2 m away from the 6-story pediatric ward building on the east side.Considering the site stratum and surrounding environment,pile-anchor structure is adopted in this foundation pit.The scheme of high-pressure jet grouting pile waterproof curtain combined with tube well dewatering is adopted in groundwater control.During the whole construction of the project,the foundation pit and surrounding buildings is monitored.The monitoring results show that the pile anchor support+high pressure jet grouting pile waterproof curtain+tube well dewatering scheme is economical and reasonable in this type of site,which ensures the safety of surrounding buildings.A reasonable process is adopted to minimize the impact on the medical conditions during the construction period.