Grouting method for prestress vertical pipes for bridge box beam

Abstract

The invention relates to the technical field of road and bridge construction, in particular to a grouting method for prestress vertical pipes for a bridge box beam. The bridge box beam comprises a boxbeam body, the box beam body comprises a panel, a baseplate and a web, and the panel, the baseplate and the web are internally provided with box beam reinforced concrete. The construction method comprises the following steps that 1, the prestress pipes are inserted in the box beam reinforced concrete of the web and fixed; 2, steel cables penetrate through the prestress pipes, and anchors sleeve the prestress pipes; 3, the bottoms of the adjacent prestress pipes are communicated with connection pipes; 4, the whole box beam is poured; 5, the upper ends of the prestress pipes are tensioned through the anchors and locked through steel cables; 6, a grouting pipe of grouting equipment is inserted one any prestress pipe port for grouting, and when grout of the upper end of each prestress pipe overflows, grouting is ended. The grouting method has the advantages that the grouting efficiency is greatly improved, the pouring quality is improved, and the quality defect is fundamentally avoided.

Description

technical field [0001] The invention relates to the technical field of road and bridge construction, in particular to a grouting method for prestressed standpipes of bridge box girders. Background technique [0002] In recent years, with the continuous development of my country's national economy, the level of infrastructure, including road traffic construction, has continued to increase. Various long-span bridges are increasingly becoming an important part of the development of traffic. [0003] How to ensure the construction quality of the new bridge is an important task in bridge construction. Concrete bridge damage manifests in various forms, such as loss of prestress, concrete damage and cracking, corrosion of steel bars, support voids, etc. These damages lead to a decrease in the overall stiffness and bearing capacity of concrete bridges, and are an important cause of bridge safety hazards. Eliminating quality defects during construction and ensuring the grouting qua...

AI Technical Summary

Problems solved by technology

At present, the grouting of prestressed pipes is single-pipe grouting, and there are the following problems: First, the grouting from the upper part of the pipe is sealed because the bottom of the pipe must be ventilated while grouting, which may easily lead to the defect that the grouting is not dense; The second is low efficiency. Due to the frequent movement of the grouting machine and the connection of grouting pipelines, there are also many vertical pipes for bridges with a length of more than 200 meters, and it is common for the length of the pipeline to be more than 8 meters.

Even if a prestressed pipe is grouted in 3 minutes, plus moving the machine, reconnecting the pipe, etc., the overall construction time will be very long; thirdly, due to the long overall time, it is difficult to ensure the stable quality of the grout

Images