Bridge caisson composite pile foundation and reverse construction method thereof

Abstract

The present invention discloses one kind of composite bridge caisson pile foundation and its reverse construction process. After the bridge caisson is sunk to site, piling construction is performed inside the caisson to form pile with upper part connected to the caisson integrally and to constitute composite caisson pile foundation. The construction process includes the steps of prefabricating caisson in land, floating the caisson and setting the caisson in dredged sea bed, driving steel pipe pile through the pre-formed hole in the bottom of the caisson through operation inside the caisson, performing the upper structure construction simultaneously, pouring concrete to connect the bottom plate of the caisson with the steel pipe pile. The present invention has the load borne commonly by the caisson and the pile, and is suitable for bridge construction in deep sea and soft soil foundation.

Description

technical field [0001] The invention belongs to the structure and construction of deep-water bridge foundations, and in particular relates to a bridge caisson composite pile foundation and an inverse construction method thereof. Background technique [0002] The current bridge foundation structure types include high pile cap foundation, low pile cap foundation, caisson foundation, caisson plus pile foundation, caisson foundation and so on. [0003] Because the pile foundation has the advantage of directly transmitting the upper load to the deep and better bearing layer, it can overcome the post-construction settlement problem of the deep soft foundation or the overburden when there is a weak interlayer in the covering layer, so it is often used Pile cap foundation. According to stratum conditions and construction conditions, pile foundations are further divided into bored piles and driven steel pipe piles. Among them, driven steel pipe piles are widely used in sea-crossing...

AI Technical Summary

Problems solved by technology

The high pile cap foundation cannot meet the huge horizontal force design requirements under deep ocean conditions; if the low pile cap foundation is used, according to the current pile foundation design theory, it is established on the basis of satisfying the bearing capacity, that is, it is determined according to the superstructure load The number of piles and the length of piles, obviously, for the case of excessive settlement and the use of pile foundations, the use of this traditional pile foundation is too conservative, resulting in excessive foundation engineering costs, and low pile cap foundations under deep water conditions The construction is very difficult, so for the bridge foundation of deep water soft foundation, the low pile cap foundation cannot adapt; Covering the soft base without any treatment will cause large post-construction settlement, which is not good for the superstructure of the bridge. Therefore, it is necessary to solve the main technical problem of post-construction settlement and deformation; Settlement and deformation, but whether the caisson can sink smoothly is closely related to geological conditions; the caisson composite foundation similar to the Rio-Antirio Bridge is also conducive to solving post-construction settlement deformation, but the construction of the composite foundation needs to overcome the harsh marine environmental conditions , and the cost is huge

Therefore, when encountering the construction conditions of deep water (water depth greater than 50 meters) and deep soft foundation covering layer, the above existing bridge foundation types have limitations and are difficult to adapt to

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