Method for reinforcing round-section pier by using polyurethane concrete materials and thin-wall steel sleeves

Abstract

The invention relates to a method for reinforcing a round-section pier, in particular to the method for reinforcing the round-section pier by using polyurethane concrete materials and thin-wall steel sleeves. The method needs to solve the problem that in an existing frequently-used bridge reinforcing technique, the interface strength is insufficient, internal damage gaps can not be densely packed, the construction is tedious, the construction period is long, and the tensile strength and compressive strength of a component can not be improved at the same time. The method includes the following steps that a mortar layer on the surface of concrete on a concrete pier reinforcing part is chiseled away, and cleaning and drying are then conducted; connecting rebars are implanted in the concrete pier reinforcing part, and then welding shear nails are arranged according to the quincunx in semicircular thin-wall steel sleeves; every two of the semicircular thin-wall steel sleeves with the welding shear nails are oppositely welded to form the thin-wall steel sleeves on the surface of the concrete pier reinforcing part, the polyurethane concrete materials are prepared and poured in the thin-wall steel sleeves, and curing is conducted under natural conditions. The method is used for reinforcing the round-section pier by using the polyurethane concrete materials and the thin-wall steel sleeves.

Description

technical field [0001] The present invention relates to a method for strengthening circular cross-section bridge piers. Background technique [0002] Nowadays, the commonly used bridge reinforcement methods include enlarging section reinforcement, pasting material reinforcement and other methods. Enlarging the section reinforcement increases the axial compression / eccentric compression bearing capacity of the member by increasing the thickness of the section, but it is prone to the problem of insufficient strength of the joint surface of new and old concrete, and the curing time of conventional concrete is long, and thicker aggregates cannot be better. Filling the internal defect concrete; the reinforcement method of pasting carbon fiber cloth can make full use of the excellent tensile strength and stiffness of carbon fiber materials, but because the carbon fiber cloth is thin, the increase in the compressive stiffness of the column is not significant, and due to its own elas...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of insufficient interface strength, inability to densely fill internal damage gaps, cumbersome construction, long construction period and inability to simultaneously improve the tensile and compressive strength of components in the existing commonly used bridge reinforcement technology, and provides a method using polyurethane concrete Material and thin-walled steel sleeves to strengthen circular cross-section piers

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