双向水泥土搅拌桩智能化施工技术研发及实践

Research and practice of the intelligent installation technology of bidirectional cement-soil mixing pile

为解决常规单向水泥土搅拌桩水泥浆沿桩体垂直分布不均匀、桩体搅拌不均匀和处理深度有限等技术问题,成功研发双向水泥土搅拌桩技术,有效保证搅拌桩成桩质量,提高了搅拌桩施工效率和软基处理能力。目前双向搅拌已经是国内搅拌桩的主流施工方法,但大量的工程实践和进一步的研究表明,搅拌桩技术仍存在一些不足之处,主要表现为设计与施工忽视土体成层性、施工设备自动化程度低、施工质量监控及检验方法落后等。针对这些不足,以双向水泥土搅拌桩技术为基础,应用物联网技术,对水泥土搅拌桩智能化施工技术进行了研究。研究结果表明,基于土层的精准识别实施变频喷浆,契合土体的分层特征,有效保证水泥浆与土体搅拌充分,实现了水泥土搅拌桩智能化施工;通过数据共享方式实现施工现场的远程监控,可对搅拌桩施工全过程进行记录与监测;实时采集、分析施工参数,单桩施工完成即时评估其施工质量,甄别不合格桩,可为工后检验提供依据,并可减少工后检验工作量。本文对水泥土搅拌桩智能化施工进行了初步探索,实践证明通过智能化施工可显著提高水泥土搅拌桩施工效率和施工质量,降低工程造价,这不仅产生重大的经济效益,而且有效地推进了搅拌桩技术的发展。

In order to solve the technical problems of conventional cement-soil mixing piles such as uneven vertical distribution of cement slurry along the pile body,uneven mixing of the pile body and limited treatment depth,the bidirectional cement-soil mixing pile technology has been successfully developed.This technology effectively guarantees the pile quality of the mixing pile,and improves the construction efficiency of the mixing pile and the soft foundation treatment capacity.At present,the bidirectional soil-cement mixing pile has been the mainstream installation method of mixing piles in China.However,some deficiencies are revealed in a large amount of engineering practice and further research.The main problems are that the design and construction ignore soil stratification,the automation degree of construction equipment is low,and the construction quality monitoring and inspection methods are backward.Concerning these problems,the intelligent installation technology of cement-soil mixing pile is researched based on the bidirectional cement-soil mixing pile and internet of things technologies.The research results show that the variable frequency spraying is implemented based on the accurate identification of the soil layer,which fits the layered characteristics of the soil.This effectively ensures that the cement slurry and the soil are fully mixed,and realizes the intelligent construction of the cement-soil mixing pile.The remote monitoring is realized through data sharing,and the whole process of installation can be recorded and monitored.Collect and analyze construction parameters in real time,evaluate the construction quality of single pile construction immediately after completion of construction,and identify unqualified piles.This can provide a basis for post-work inspection and reduce the workload of post-work inspection.This paper makes a preliminary exploration on the intelligent installation of cement-soil mixing piles.The engineering practices show that the effiency and quality of cement-soil mixing piles are improved,and the project cost can be reduced significantly.This not only produces significant economic benefits,but also effectively promotes the development of mixing pile technology.