Caisson composite foundation provided with suction type apron shells and semi-rigid connection piles

Abstract

The invention discloses a caisson composite foundation provided with suction type apron shells and semi-rigid connection piles. The caisson composite foundation comprises a caisson, the suction type apron shells, a semi-rigid cushion layer and the preformed piles. The tops of the multiple suction type apron shells are fixedly connected to the circumference of the bottom of the caisson; the semi-rigid cushion layer is formed below the caisson and makes direct contact with the bottom of the caisson to be a whole; the top ends of the multiple preformed piles are fixedly connected to the interior of the semi-rigid cushion layer and are connected with the semi-rigid cushion layer to be a whole; the bottom ends of the multiple preformed piles extend the deep position of the foundation. According to the caisson composite foundation provided with the suction type apron shells and the semi-rigid connection piles, vertical stress is mainly borne by the pile groups, horizontal stress is mainly borne by the suction type apron shells, and therefore the horizontal stress, vertical stress, bending resistance stress and anti-torsion stress properties of the composite foundation are good, the erosion prevention performance is high, and the economical efficiency is good.

Description

technical field [0001] The invention belongs to the technical field of bridges, in particular to a caisson composite foundation with a suction skirt and semi-rigid connecting piles. Background technique [0002] As bridge construction moves from inland to the open sea, construction conditions such as deep water, soft foundation, strong wind, rapids, waves, and strong earthquakes become more complex. The foundations of sea-crossing bridges are often located in deep water areas, and there are thick covering layers of soft soil, sandy soil, cohesive soil, and crushed (pebble) soil alternately, and there may be uneven soft (hard) interlayers in the covering layer; The main tower foundations of span cable-stayed bridges and suspension bridges bear not only huge vertical forces, but also horizontal loads such as wave forces, earthquake forces, and ship collision forces. The above construction conditions put forward extremely high requirements on the construction process and opera...

AI Technical Summary

Problems solved by technology

Relying on the negative pressure in the group tube to press the foundation into the soil, the foundation has strong horizontal, bending and torsional bearing capacity, but the vertical bearing capacity of the foundation is limited and the vertical deformation is relatively large

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