Construction method of thin-wall prestressed concrete aqueduct

Abstract

The invention provides a construction method of a thin-wall prestressed concrete aqueduct. The concrete aqueduct is made of concrete and an expanding agent, wherein the mass ratio of the concrete to the expanding agent is 79:1. The concrete with the expanding agent is used as a plug, a post-cast strip and second-stage concrete of a large-size concrete structure, the full section of a hydraulic structure is of a shrinkage-compensating concrete structure, and the concrete with the expanding agent is used for a large-span thin-wall prestressed aqueduct structure. The large-span thin-wall prestressed aqueduct of the large-size concrete structure is high in structural strength and low in cost, and the construction period is shortened. The raw materials used in the method are easy to obtain, lowin cost, thin in wall, high in strength and large in span, and the method has good practical application value.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for a thin-walled prestressed concrete aqueduct. Background technique [0002] Concrete, as the largest man-made engineering material, has rich raw materials, low price, local materials, easy molding, and good durability. It can be made into concrete of different strength levels. It has become the material of choice for modern engineering structures and has been widely used. However, concrete is a heterogeneous and brittle material. Concrete will shrink in volume during hydration and hardening. The hydration of cement in concrete will release a large amount of heat of hydration. When the shrinkage stress of concrete is greater than its ultimate tensile stress , the concrete will crack. Eighty percent of the concrete cracking problems are caused by the non-load stress of the concrete material, among which the shrinkage of the concrete is the most...

AI Technical Summary

Problems solved by technology

Since the implementation of "Technical Regulations for the Application of Shrinkage Compensating Concrete" (JGJ / T178-2009), it has been promoted and applied in the construction industry to a certain extent. Although it is also used in the water conservancy industry, it is often used as a local plug and post-cast belt for large-volume concrete structures. , Phase II concrete, etc., there are few cases of using shrinkage-compensating concrete structures for the entire section of hydraulic structures, especially for large-span thin-wall prestressed aqueduct structures that require high concrete performance. the case

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