Composite connection type concrete filled steel tube bridge pier and construction method thereof

Abstract

The invention relates to a composite connection type concrete filled steel tube bridge pier. The composite connection type concrete filled steel tube bridge pier comprises a load-bearing foundation and steel tube concrete; the steel tube concrete comprises a steel tube, a bottom plate and bridge pier column concrete cast in the steel tube in situ; multiple fixing holes used for fixing anchor boltsare formed in the bottom plate; the anchor bolts penetrate through the fixing holes from bottom to top and are in close fit with nuts to lock the bottom plate on the load-bearing foundation; multipleU-shaped stabilizing tubes are embedded and fixed at the upper end of the load-bearing foundation in the longitudinal direction; two openings of each U-shaped stabilizing tube both communicate with the cavity of the steel tube; and the bridge pier column is poured into the U-shaped stabilizing tubes from the openings to be solidified to form anti-pulling buckles. According to the composite connection type concrete filled steel tube bridge pier, through combination of a prefabricated construction method and a cast-in-situ construction method, the steel tube, the bridge pier column concrete andthe load-bearing foundation can be compositely connected to form a whole body; and the anti-pulling capacity, anti-shearing capacity and anti-seismic capacity of the constructed bridge pier are high.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a composite connection type concrete filled steel pipe pier and a construction method thereof. Background technique [0002] Concrete filled steel pipe refers to the structural member filled with concrete in the steel pipe, which can bear the external load together with the steel pipe after the concrete is solidified. Concrete has high compressive strength, but weak bending resistance; while steel has strong bending resistance and good elastic-plastic properties, but it is prone to instability and loses axial compressive capacity when it is compressed. Concrete-filled steel pipe can combine the advantages of the two in structure. The steel pipe can make the concrete in a state of lateral compression, and its compressive strength can be doubled. At the same time, due to the existence of concrete, the rigidity of the steel pipe is improved. Work together to greatly incr...

AI Technical Summary

Problems solved by technology

The existing concrete-filled steel pipe piers usually fix the steel pipes on the load-bearing foundation, but the pier column concrete filled inside does not form an effective connection with the load-bearing foundation, resulting in no effective connection between the steel pipes, pier column concrete and the load-bearing foundation As a whole, the piers made by construction have poor pullout, shear and earthquake resistance, and the stability and safety of the bridge are low.

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