Composite pier with dumbbell-shaped concrete filled steel tubes, and structure and method for collection with cushion cap

Abstract

The invention discloses a composite pier with dumbbell-shaped concrete filled steel tubes. The pier comprises two round steel tubes and a dumbbell-shaped steel tube which is welded between the two round steel tubes, composed of two layers of steel plates and symmetric along a form center connecting line of the two round steel tubes, wherein the two layers of steel plates and the round steel tubes are welded by angle welding seams. An end plate is welded on the bottom of the dumbbell-shaped steel tube; the outer profile of the end plate is larger than the outer profile of the cross section of the dumbbell-shaped steel tube; one anchor bolt hole is formed in two sides of the end plate along the horizontal bridge direction of the pier; and the dumbbell-shaped steel tube is filled with concrete. The pier and a cushion cap are connected through embedding of a grouting corrugated sleeve. According to the invention, the dumbbell-shaped steel tube and the reinforced concrete cushion cap are pre-cast components; factory pre-fabrication requirements can be satisfied; assembly is achieved on site; and rapid construction is carried out. The pier disclosed by the invention is characterized by high axial and flexural bearing capacities, high ductility and high horizontal rigidity; construction is convenient; on-site operations and web operations are fewer; demands for rapid construction can be satisfied; and the pier is applicable to major bridge projects especially high pier structures.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a dumbbell-shaped steel pipe concrete composite bridge pier. Background technique [0002] With the development of my country's transportation industry, a large number of high-speed railways, highways, and sea-crossing bridges have been put into construction and use. In high-intensity seismic fortification areas, in order to ensure the safety of bridge structures, bridge piers, as important load-bearing components, have high requirements for their seismic performance. Traditional bridge piers mostly use reinforced concrete piers, which have poor bearing capacity and ductility, and are prone to damage under strong earthquakes. For important lifeline projects such as sea-crossing bridges, it is extremely difficult to repair bridge piers when they are damaged. [0003] In recent years, CFST bridge piers have been used in bridge structures due to their good seismic performance and...

AI Technical Summary

Problems solved by technology

The purpose of the dumbbell-shaped concrete-filled steel pipe composite pier is to overcome the shortcomings of the existing pier, such as self-heaviness and poor seismic performance, and fully consider the characteristics of the large difference in stiffness between the cross-bridge direction and the along-bridge direction of the pier. The pier has high bearing capacity and ductility Good, large transverse lateral stiffness, suitable for high piers

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