Foundation pit supporting construction method for constructing local height limited area: Fid-Bau Portal

Foundation pit supporting construction method for constructing local height limited area

JIANG RONGWEI / WANG JUN / WANG SHEN'EN / NIE MINGMING

According to the foundation pit supporting construction method for constructing the local height limited area, a cast-in-place hollow concrete pipe joint pile is adopted to replace a traditional supporting structure, the inner side friction resistance of the pile is reduced by digging out soil in the pipe joint pile, the pipe joint pile sinks to the designated elevation by means of the self-weight effect of a pipe joint pile component, and the foundation pit supporting structure is constructed. Therefore, the rigidity of the supporting structure of the section with the limited height of the construction machinery is equivalent, and safe closing of the foundation pit supporting structure is ensured. The cast-in-place hollow pipe section pile is used for replacing a supporting and retaining structure which cannot be constructed in the original position, it is ensured that the supporting and retaining structure of the foundation pit is closed, a supporting and retaining system is more reasonable, the stability of the foundation pit is improved, displacement and sedimentation of the foundation pit are limited, and it is ensured that the foundation pit is safe and reliable in the construction period in the complex construction environment.

本发明提供了一种用于施工局部高度受限区域的基坑支护施工方法，采用现浇中空混凝土管节桩替换传统支挡结构，通过挖除管节桩内部土体以减少桩内侧侧摩阻力，并利用管节桩构件的自重效应，使管节桩下沉至指定标高，从而使施工机械高度受限的区段支挡结构刚度等效，确保基坑支挡结构安全地闭合。本发明使用现浇中空管节桩替代原位置无法施工的支挡结构，确保基坑支挡结构闭合，使支护体系更加合理，增加基坑稳定性，限制基坑的位移和沉降，确保基坑在复杂的施工环境下、在施工期间的安全可靠。

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