Foundation pit covering and excavating structure for construction under bridge side traffic opening and construction method

Abstract

The invention relates to a foundation pit covering and excavating structure for construction on the traffic side under a bridge. The foundation pit covering and excavating structure comprises steel pipe piles, bailey beams, I-shaped steel, a steel plate, an asphalt surface layer, guardrails and secant piles. A steel pipe pile is arranged in the foundation pit under the bridge and is formed by connecting a plurality of short steel pipes with lock catches through flanges; secant piles are arranged in a foundation pit outside the bridge, the steel pipe pile on the outermost side is in embedded lap joint with the plain concrete pile of the secant piles, and a grouting pipe is welded to the lap joint position of the steel pipe pile on the outermost side and the plain concrete pile; grooves are formed in the tops of the steel pipe piles, and the bailey beams are placed in the grooves of the steel pipe piles on the two sides of the foundation pit. The method has the beneficial effects that the under-bridge road is closed, one side is subjected to supporting structure construction, the other side passes, and the influence of construction on passing can be reduced to the maximum extent. A cover excavation method is adopted for foundation pit construction, traffic can be rapidly achieved through composite structures such as bailey beams, I-shaped steel, steel plates and asphalt, the foundation pit is excavated on the lower portion while traffic is conducted on the upper portion, and the construction progress is not delayed while traffic is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of foundation pit support, and in particular relates to a foundation pit cover excavation structure and construction method under a bridge open to traffic, which is suitable for foundation pit construction under a bridge open to traffic. Background technique [0002] As urban engineering construction becomes more and more intensive, projects requiring excavation of foundation pits under bridges often appear. The excavation of the foundation pit under the bridge is restricted by the bridge, and there are problems of limited clearance above the foundation pit and the impact of foundation pit excavation on adjacent piers. Some ground roads under viaducts are heavily trafficked and cannot be diverted due to surrounding environmental restrictions. The excavation of foundation pits under the bridges cannot interrupt the opening of the ground roads under the bridges. Fragmented excavation is usually used in tradit...

AI Technical Summary

Problems solved by technology

The excavation of the foundation pit under the bridge is restricted by the bridge, and there are problems of limited clearance above the foundation pit and the impact of foundation pit excavation on adjacent piers

Some ground roads under viaducts are busy with traffic and cannot be diverted due to surrounding environmental restrictions. The excavation of foundation pits under the bridges cannot interrupt the opening of the ground roads under the bridges.

Fragmented excavation is usually used in traditional construction. Fragmented excavation compresses the traffic lanes, causing great inconvenience to the opening of the road under the bridge. Therefore, it is urgent to develop a cover-excavation foundation pit support that can realize construction under the bridge while opening to traffic. The structure and its construction method enable the road under the bridge to pass normally above the foundation pit while excavating the foundation pit below, and to ensure that the pier is not affected by the excavation of the foundation pit and ensure the safety of traffic above the foundation pit

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