System and design method applying tree-root piles and pile side compacted grouting

Abstract

The invention discloses a system and a design method applying tree-root piles and pile side compacted grouting, which can be used for effectively reducing disturbance of foundation excavation on an adjacent surrounding building and preventing the surrounding building from sinking. The tree-root piles are tightly arranged between a foundation and the surrounding building; on one hand, the tree-root piles pass through a soil body sliding area between the foundation and the surrounding building and are embedded into a soil body under the soil body sliding area, and when the soil body shifts and is deformed, the shearing resistance of a sliding face of the tree-root piles and the side resistance and rigidity provided by a pile body are improved to limit the deformation development of the soil body after pilling and reduce the sinking and deformation of the building after pilling; on the other hand, when the surrounding building near the foundation is sunk and deformed largely, the lateral deformation of the tree-root piles can be effectively controlled by the method applying pile side compacted grouting, and the deformation development rate of the surrounding building is reduced; moreover, the tree-root piles are tightly arranged, the grouting pressure can be uniformly dispersed into the foundation under protected building facilitates, and direct grouting on the foundation is avoided to make the building facilitates uniformly lifted and protruded.

Description

technical field [0001] The invention relates to the technical field of foundation pit construction, in particular to a system and a design method for protecting surrounding buildings of a foundation pit by adopting tree root piles and pile side compaction grouting. Background technique [0002] With the rapid development of urban construction, a large number of deep foundation pit projects have been encountered in urban construction. Many deep foundation pit projects are adjacent to housing buildings or other municipal facilities, and some are even cultural relics protection buildings. Some of these buildings are civil residences with brick-wood or brick-concrete structures, and their foundations are mostly large-footed foundations on natural foundations, which are very sensitive to the settlement and displacement of foundation soil; some buildings are important municipal facilities, and their The requirements for settlement or differential settlement control of the foundat...

AI Technical Summary

Problems solved by technology

However, when the excavation of the foundation pit has already caused the settlement and deformation of the surrounding facilities to be too large, the conventional isolation pile technology will lose its effect; Side) grouting reinforcement protection method, but this method is not suitable for shallow infrastructure, because the main purpose of pile external grouting is to increase the side wall friction resistance of the pile foundation of the protected facility, and improve the pile foundation's anti-deformation capacity, while the shallow foundation Direct grouting under the infrastructure will cause the building to rise unevenly, causing uplift damage

Images