Process test method for pumping and pouring concrete in main arch pipe of concrete-filled steel tube arch bridge

Abstract

The invention relates to the technical field of concrete-filled steel tube arch bridge construction, and particularly relates to a process test method for pumping and pouring concrete in a main arch pipe of a concrete-filled steel tube arch bridge, which can effectively obtain the motion state of actual concrete in a pump pipe on site by carrying out a pumping and pouring test on the test pump pipe before actual bridge pouring. Fitting calculation is carried out according to test results of a third pipe section in three states, on-way resistance of on-site actual concrete in the main pipe steel pipe at various angles can be effectively obtained, the actual construction concrete is fully utilized to simulate the dynamic working condition of actual bridge pouring, and the concrete performance, the pumping distance and the pump machine power are effectively verified. The method is used for specifically guiding the on-site pumping construction process and the position division of the grading segments, effectively avoids pipe blockage, pipe explosion and other accidents caused by concrete performance, pump pipe arrangement, pumping pressure and the like, and is beneficial to guaranteeing the construction period, construction safety and pouring quality.

Description

technical field [0001] The invention relates to the technical field of CFST arch bridge construction, in particular to a process test method for pumping and pouring concrete in the main arch pipe of a CFST arch bridge. Background technique [0002] The CFST arch bridge is an excellent steel-concrete composite structure bridge. It has the characteristics of economy, durability and convenient construction. It has strong span adaptability and can span deep canyons with one hole. It has a strong comparative advantage in the construction of bridges in the mountainous areas of western Sichuan. Demand is high. The main arch of the CFST arch bridge is its main bearing structure. The steel tube has a hoop effect on the core concrete, which improves the strength and ductility of the concrete. The existence of the core concrete inhibits the local buckling of the steel tube. Therefore, the quality of the core concrete is directly related to the steel tube. bearing capacity of concrete....

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the lack of pumping construction technical guidance in the construction process of the existing 500m-span and above concrete-filled steel pipe arch bridge, which leads to the continuous increase of the length of the jacking and pouring, the prolongation of the construction time, and the increase of the pumping pressure, which is prone to occur In view of the above-mentioned shortcomings such as pipe plugging, pipe bursting and other accidents, a process test method for concrete pumping and grouting in the main arch pipe of a concrete filled steel pipe arch bridge is provided

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