Suspension bridge anchorage composite foundation applicable to deepwater soft soil area and construction method thereof

Abstract

The invention discloses a suspension bridge anchorage composite foundation applicable to a deepwater soft soil area. The suspension bridge anchorage composite foundation comprises a driven pile set, acushion layer, a prefabricated caisson, an anti-washout layer, a prefabricated cover plate and a bearing platform. The driven pile set is provided with multiple driven piles, the driven piles are densely distributed in a circular area and combined with existing soft soil to jointly form a rigid pile composite ground foundation. The cushion layer is arranged on the existing soft soil of the rigidpile composite ground foundation. The prefabricated caisson comprises a base table, a first caisson body and a second caisson body which are integrally formed, the first box body comprises a first cylinder and a second cylinder, the second box body comprises a circular-truncated-cone-shaped cylinder and a third cylinder which are integrally formed, the anti-washout layer surrounds the outer wall of the third cylinder, the upper portion of the first box body bears the prefabricated cover plate, and the prefabricated cover plate bears the bearing platform. The prefabricated caisson is of a circular section, water flow adaptability is good, the local washout depth is small, and water flow force and wave force borne by the structure are small.

Description

technical field [0001] The invention belongs to the field of bridges, and more specifically relates to an anchorage composite foundation of a suspension bridge suitable for deep water soft soil areas and a construction method thereof. Background technique [0002] With the rapid development of the national economy, the demand for traffic construction has soared, and more and more large bridges are being built and are about to be built at home and abroad, and with the emergence of cross-sea bridges, the spans of bridges are getting larger and larger. Most of these long and large bridges are suspension bridges, and they are built on deep and fast-flowing rivers or seas with harsh environments. They often encounter problems such as deep water depth, poor covering soil quality, and heavy erosion, which are very unfavorable for bridge construction. It is also more difficult to build. [0003] At present, the existing large-diameter bored pile foundation or caisson foundation is ...

AI Technical Summary

Problems solved by technology

[0004] 1) The high pile cap bored pile foundation has deep scour depth, large free length, and low lateral stiffness. For long-span bridges under the action of horizontal forces such as water flow force, wave force, and anti-collision force, large-scale large-scale High-diameter pile cap foundation, large-scale foundation, long construction period, and poor economic benefits

Construction requires platform erection, steel casing insertion, steel cofferdam, etc. There are many temporary auxiliary projects and the construction process is complicated

[0005] 2) The overall caisson foundation has good integrity and large bearing capacity, but it requires processes such as steel caisson floating, precise positioning, and mud suction sinking. There are many construction procedures, long periods, and high construction risks. Under bad conditions, the sinking of the caisson is prone to sudden sinking

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