Assembled active powder concrete box girder and its construction method

Abstract

The invention relates to an assembled type reactive powder concrete box girder and a construction method thereof. Reactive powder concrete materials are high in strength, good in durability but poor in workability, high-temperature steam curing is needed, the requirement for the construction technology is high, the requirements for conditions of full-span steam-curing houses and equipment are high, the requirements for humidity and temperature are hard to meet, and the engineering quality of the reactive powder concrete box girder cannot be guaranteed through a full-span prefabricated or cast-in-place box girder structure. The reactive powder concrete box girder is formed by splicing a plurality of prefabricated segments. Each prefabricated segment comprises an n-shaped top plate at the top, an n-shaped bottom plate at the bottom and two web plates on the two sides of the position between the n-shaped top plate and the n-shaped bottom plate. The n-shaped top plates, the n-shaped bottom plates and the web plates are made of reactive powder concrete materials. In each prefabricated segment, the n-shaped top plate, the n-shaped bottom plate at the bottom and the two web plates on the two sides of the position between the n-shaped top plate and the n-shaped bottom plate are spliced into a closed structure through cast-in-place reactive powder concrete joints. A prefabricated part form board is simple, construction and vibration are convenient, no large-area steam-curing house or large-power steam-curing equipment is needed, quality control is easy, the investment is saved, the efficiency is high, and environment friendliness is good.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering construction, and in particular relates to an assembled active powder concrete box girder and a construction method thereof. Background technique [0002] At present, the box girder structure of railways, highways, and municipal bridges adopts concrete structure. Due to its heavy weight and low material strength, its development in the direction of large-span whole-hole transport frame is restricted. The active powder concrete material has high strength and good durability. Applying it to the box girder structure can solve the problems of ordinary concrete materials such as heavy weight and low material strength. However, the active powder concrete material has poor workability and requires high-temperature steam curing. High, the whole hole cast-in-place or prefabricated construction has high requirements for steam-cured houses and equipment conditions, it is difficult to meet the humi...

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Problems solved by technology

[0002] At present, the box girder structure of railways, highways, and municipal bridges adopts concrete structure. Due to its heavy weight and low material strength, its development in the direction of large-span whole-hole transport frame is restricted.

The active powder concrete material has high strength and good durability. Applying it to the box girder structure can solve the problems of ordinary concrete materials such as heavy weight and low material strength. However, the active powder concrete material has poor workability and requires high-temperature steam curing. High, the whole hole cast-in-place or prefabricated construction has high requirements on steam-cured houses and equipment conditions, it is difficult to meet the humidity and temperature requirements, and the project quality cannot be guaranteed

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