Existing shallow foundation building protection device under multi-sided enclosing excavation condition and construction method

Abstract

The invention relates to an existing shallow foundation building protection device under the multi-sided enclosing excavation condition and a construction method, and belongs to the technical field ofexisting building protection. The protection device comprises arc-shaped force transfer structures mutually lapped transversely and longitudinally, and connecting parts of the arc-shaped force transfer structures lapped transversely and longitudinally. Each arc-shaped force transfer structure comprises an outer arc-shaped steel pipe, an inner prestress steel strand and an end anchoring structure;each inner prestress steel strand is arranged in the corresponding outer arc-shaped steel pipe in a penetrating mode, and the shape of the outer arc-shaped steel pipe is adjusted through a stress value of the inner prestress steel strand; and each outer arc-shaped steel pipe penetrates through a retaining structure, and the two ends of each outer arc-shaped steel pipe penetrates are fixedly connected with the foundation pit retaining structure through end fixing bolts. According to the protection device, loads of an existing building are transferred to the surrounding retaining structure withhigh stiffness through the arc-shaped steel pipes, and the existing building is protected through the foundation pit retaining structure; and meanwhile, a method of adjusting the steel pipe prestressis adopted, and pointed delicacy control over settlement of the building is conducted according to monitoring data.

Description

technical field [0001] The invention relates to a protection device for existing shallow foundation buildings under the condition of multifaceted excavation and a construction method thereof, which is suitable for the protection of buildings under the condition of multifaceted excavation, especially for the protection of ancient buildings with shallow foundations, and belongs to underground engineering Existing building protection technology field during construction. Background technique [0002] It is not uncommon for foundation pit engineering to form multiple sided excavations on existing protected buildings. In this case, the building is on an "isolated island", and there are unloading effects caused by foundation pit excavation in multiple directions, and soil displacement The law of field changes is complex, and deformation control is difficult; especially, for ancient buildings with shallow foundations, due to the weak foundation form, the aging of the upper structur...

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Problems solved by technology

However, for buildings in the excavated state, it is very difficult to control the displacement and deformation of the foundation soil itself. Simply treating the foundation soil through grouting reinforcement and static pressure pile foundation cannot effectively control the construction. deformation of

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