Bridge composite foundation consisting of open caisson and pile and construction method

Abstract

The invention discloses a bridge composite foundation consisting of an open caisson and a pile and a construction method and relates to bridge technology. The composite foundation consists of the open caisson and the pile. Open caisson partition walls have horizontal and longitudinal wall structures. A pile sinking preformed hole is reserved at the intersection of the open caisson partition walls. A steel pipe pile or a concrete driven pile sinks through the hole. The construction method comprises the following steps of: manufacturing the first section of the open caisson, floating the first section to a bridge position designed position, positioning the first section, filling water into an open caisson wall and the partition walls to sink the pile, heightening the section until the open caisson sinks to position, and casting concrete into the open caisson wall and the partition walls; after the open caisson sucks mud to sink, continuously heightening the section, and casting open caisson bottom sealing concrete when the open caisson is heightened to a designed standard height; riprapping the periphery of the open caisson to protect the open caisson, pumping water from the open caisson or coring the open caisson, and constructing an open caisson top plate; and after sinking the pile in the pile sinking preformed hole, casting the concrete into the pile sinking preformed hole to realize connection between the open caisson and the pile. The bridge composite foundation of the invention is suitable for a deep water soft soil foundation, takes the advantage of the open caisson having high rigidity and serving as a pile foundation construction space enclosing structure and exerts the characteristic of controlling sinking of the pile foundation.

Description

technical field [0001] The invention relates to the technical field of bridges, and relates to a novel bridge foundation structure form composed of caissons and piles with reserved holes in partition walls and a composite foundation construction method for sinking piles in the reserved holes of the caissons. Background technique [0002] Caisson foundation refers to an empty or multi-chamber well box structure, using its own weight and soil removal in the well hole, passing through the sea (river, river) water depth and covering layer, reaching the predetermined elevation, clearing the foundation or rock surface in the wellbore, and pouring The underwater concrete back cover forms the foundation of the bridge. According to different construction methods, it can be divided into several types such as heavy caissons under the island, floating caissons and self-floating caissons, and floating caissons directly set up. The advantages of caissons are high rigidity, strong resista...

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Problems solved by technology

[0006] The above-mentioned caisson plus pile composite foundations all have the following common disadvantages: 1. The caisson and the piles are connected through the back-sealing concrete, so the construction quality is not easy to guarantee, and the stress mechanism is complicated; The buoyancy effect of the space has not been brought into play; 3. The concrete pouring of the back cover must be carried out after the pile construction is completed, the applicability of the weak soil foundation is not strong, and the settlement after construction is relatively large

4. The above foundations are only used as ordinary bridge foundations, and cannot be used as anchorage foundations for suspension bridges

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