Underpinning device and method for bridge and building

Abstract

The invention provides an underpinning device and an underpinning method for a bridge and a building. The underpinning device comprises a plurality of columnar pile foundations arranged along a bridge pier of the bridge or around a building foundation, wherein flexible ropes are stretched among the tops of the pile foundations; different flexible ropes are arranged in a netlike form; and the two ends of the flexible ropes are anchored on the pile foundations or ground anchors. The method comprises the following steps: (1) piling around the bridge or the building and inserting steel pipes, wherein the top ends of the steel pipes are higher than an original foundation; (2) inserting reinforcing steel bars and pouring concrete into the steel pipes and solidifying the concrete to form the pile foundations; (3) arranging the flexible ropes on the tops of the pile foundations in the netlike form, tensioning the flexible ropes by using a tensioner, supporting the bridge or the building and anchoring the two ends of the flexible ropes; (4) treating the original foundation, detaching the original foundation, adding necessary facilities and building a new foundation; and (5) placing the bridge or the building on the new foundation. A composite rope supporting structure is used, so the bridge or the building can be underpinned, construction is performed easily and the engineering qualityis easy to ensure.

Description

technical field [0001] The invention relates to an underpinning device and method for bridges and high-rise buildings. Background technique [0002] The height of the bridges after the construction is completed is determined, but with the development of shipbuilding technology and the shipping industry, there are more and more large-tonnage ships, so that some bridges designed and built in the early stage are not as high as the navigation requirements for ships to pass. This makes it difficult for some large-tonnage cargo ships to pass, so that only small-tonnage ships can pass through, which is time-consuming and labor-intensive and increases costs. Demolition, redesign, and construction are costly and time-consuming. [0003] In addition, with the acceleration of urban development, the construction of underground transportation facilities such as subways or public facilities such as pipelines needs to pass under some existing ground buildings. The demand for public facil...

AI Technical Summary

Problems solved by technology

However, the beam or slab underpinning method was used in the past, and now the piles are driven on both sides of the building, and then excavated from the side to the bottom of the foundation, and the slab or beam is made under the foundation, and the upper load is supported by the slab or beam. Switching to the pile foundation on both sides, most of the operations of this underpinning method are carried out under the ground, the excavation workload is large, the construction period is long, the working space is limited, the construction is unsafe, and the quality of the project is not easy to guarantee

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