A pile foundation underpinning construction method based on a pipe section

Abstract

This invention relates to the field of tunnel construction technology, and particularly to a pile foundation replacement construction method based on a immersed tube connection section. The construction method includes the following steps: S1. Constructing replacement piles on both sides of the pile to be replaced, with the replacement pile on one side of the pile to be replaced penetrating the construction area of ​​the central partition wall; S2. Constructing a replacement cap on top of the replacement pile; S3. Constructing a replacement beam based on a soil-supported formwork, with a vertical gap between the replacement beam and the replacement cap; S4. Installing a jacking assembly within the vertical gap between the replacement cap and the replacement beam, using the jacking assembly to lift the replacement beam, and removing the portion of the pile to be replaced located below the replacement beam that interferes with the immersed tube connection section; S5. Constructing the immersed tube connection section below the replacement beam. The pile foundation replacement construction method based on an immersed tube connection section described in this invention can reduce the spacing between adjacent replacement support assemblies without occupying the internal passage of the immersed tube connection section, thereby reducing the maximum bending moment and deflection of the replacement beam.

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