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根据温州市建设局文件(2009)269号,当基坑开挖深度大于4m时,对于安全等级为一、二级或土质为淤泥、淤泥质土、松散填土、松散砂层的设置内支撑的深基坑工程,严禁采用焊接钢管支撑体系。本工程通过在基坑周边三倍开挖深度范围内进行卸土的方式将基坑开挖深度降低至4m,再采用拉森钢板桩加一道H型钢内支撑的支护形式,以解决工期紧、造价高的问题,具有一定的实践意义。
According to document No. (2009) 269 of Wenzhou Bureau of Construction, when the excavation depth of foundation pit is more than 4m, the inner support for the silt, silt soil, loose fill soil and loose sand layer with safety grade one, two or soil grade Deep foundation pit project, the use of welded steel pipe support system is strictly prohibited. This project reduces the excavation depth to 4m by means of unloading earth within the excavation depth of three times around the foundation pit, and then uses Larsen steel sheet pile plus a supporting form of H-beam internal support to solve the tight schedule , High cost, has a certain practical significance.