污泥层置换砂桩套打水泥搅拌桩软基处理技术  

Soft Foundation Construction Technology of Sludge Layer Replacement with Sand Pile and Cement Mixing Pile

作　　者：林强有 雷斌 马驰 范少峰 童心 LIN Qiangyou;LEI Bin;MA Chi;FAN Shaofeng;TONG Xin(Shenzhen Geokey Group Co.,Ltd.Shenzhen 518000,China;China Academy of Railway Sciences(Shenzhen)Research and Design Institute Co.,Ltd.Shenzhen 518034,China;Shenzhen Housing Safety and Engineering Quality Testing and Appraisal Center Shenzhen 518051,China)

机构地区：[1]深圳市工勘岩土集团有限公司,深圳518000 [2]铁科院(深圳)研究设计院有限公司,深圳518034 [3]深圳市房屋安全和工程质量检测鉴定中心,深圳518051

出　　处：《广东土木与建筑》2024年第4期51-54,69,共5页Guangdong Architecture Civil Engineering

摘　　要：水泥搅拌桩是软基处理的一种常用方式,针对水泥搅拌桩在污泥弱软层出现水泥固化效果差等问题,通过在污泥内预先施工小直径砂桩,用中粗砂置换污泥层中腐殖质,同时以“小桩套打大桩”的形式,将水泥搅拌桩套打在同桩位处的砂桩上,采用“四搅四喷”工艺,置换后砂土与水泥浆液充分均匀搅拌结合成桩,有效增强桩身强度,确保搅拌桩满足设计要求。在提高工效、确保桩体质量及降低综合施工成本等方面都突显出了独特的优越性,为解决腐殖质有机物污泥层中传统水泥搅拌桩施工效果差、成桩质量难以保证等问题提供了一种创新、实用的工艺技术。Cement mixing pile is a commonly used method for soft foundation treatment.In response to the problem of poor cement solidification effect of cement mixing pile in the weak and soft layer of sludge,a small diameter sand pile is pre constructed in the sludge,and the humus in the sludge layer is replaced with medium coarse sand.At the same time,the cement mixing pile is jacked onto the sand pile at the same pile position in the form of"small pile driving big pile",and the"four stirring and four spraying"process is adopted,After replacement,the sand and cement slurry are thoroughly and evenly mixed to form a pile,effectively enhancing the strength of the pile body and ensuring that the mixing pile meets the design requirements.It highlights its unique advantages in improving work efficiency,ensuring pile quality,and reducing comprehensive construction costs.It provides an innovative and practical engineering technology to solve the problems of poor construction effect and difficulty in ensuring pile quality of traditional cement mixing piles in humic organic sludge layers.

关 键 词：污泥层腐殖质 污泥层置换砂桩 小桩套打大桩 水泥搅拌桩 软基处理 施工技术 

分 类 号：TU753[建筑科学—建筑技术科学]