Construction method for filling concrete in steel tube arch bridge tube

Abstract

The invention relates to a concrete filling construction method for a main chord pipe of a steel pipe arch rib of a concrete-filled steel pipe arch bridge when the span is large, the height is large and the pipe diameter is large. The method comprises the steps of cleaning a steel pipe, designing a mix proportion, symmetrically arranging a grouting hole, a temporary slurry discharging hole and an exhaust hole, symmetrically arranging a feeding pipe, a slurry discharging pipe, an exhaust pipe and a stop valve, symmetrically arranging a conveying pipe and a check valve, planning a pumping sequence, pumping concrete and the like. The concrete in the steel tube arch bridge tube shows plug flow movement rule, the concrete at the surrounding part has small disturbance, the setting time is earlier than that of the concrete in the central part, the friction resistance between the concrete in the central part and the concrete in the surrounding part is gradually increased along with the pumping and jacking of the concrete, and the pumping pressure of the ground pump is gradually increased along with the gradual increase of the pumping and jacking height.

Description

technical field [0001] The invention relates to a concrete filling construction method for the steel pipe arch rib main chord of a steel pipe concrete arch bridge when the span is large, the height is high, and the pipe diameter is relatively thick. Background technique [0002] Arrange the feeding opening on the steel pipe arch, then arrange the vibrating holes along the arch axis according to the amplitude of the vibrating equipment, and fill the concrete in the pipe by manual pouring; open holes at the foot of the arch, and use the ground pump to pump the concrete in the pipe for jacking and pressure injection . [0003] Disadvantages: The method of manual pouring is time-consuming and laborious, and is suitable for concrete-filled steel tube arch bridges with small spans. The pumping jacking and pressure injection method is suitable for concrete-filled steel tube arch bridges with large spans. However, the concrete injection in the pipe is performed from a single grouti...

AI Technical Summary

Problems solved by technology

[0003] Disadvantages: The method of manual pouring is time-consuming and labor-intensive, and is suitable for concrete-filled steel tube arch bridges with small spans

The pumping jacking and pressure injection method is suitable for concrete-filled steel tube arch bridges with large spans. However, the concrete injection in the pipe is performed from a single grouting hole at the arch foot. As the pumping time prolongs, pumping jacking will be difficult and easily interrupted. Cause quality problems. In order to ensure the smooth injection of concrete in the steel pipe arch rib, it is necessary to use high-performance admixtures for concrete mixing, and use high-performance pumping equipment for injection, which will bring a large cost investment

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