Cable-stayed bridge mass concrete box beam counterweight concrete structure and construction method

Abstract

A cable-stayed bridge mass concrete box beam counterweight concrete structure and a construction method are disclosed. The structure of the cable-stayed bridge mass concrete box beam counterweight concrete structure is that a concrete box beam pier top solid section is divided into two parts, one part is of a streamline box type structure with a cross beam, the other part is of a counterweight concrete structure, and the counterweight concrete structure is provided with a pre-buried steel box and a pre-buried steel tube to serve as a permanent internal mold to form a hollow part and independently poured with concrete. In construction, besides cooling water pipes are arranged in the concrete box beam, under the premise that the structural integrality and force bearing are not affected, pouring is conducted on the box beam concrete for two times. According to the cable-stayed bridge mass concrete box beam counterweight concrete structure and the construction method, releasing of heat at the center of a mass counterweight concrete main body is dispersed, the heat radiating area is enlarged, the temperature difference between inside and outside caused by heat of hydration is rapidly decreased, the bearing capacity of the counterweight concrete structure is enhanced, and the safety, the durability and the stability of concrete are promoted.

Description

technical field [0001] The invention relates to the technical field of bridge structure design and construction, in particular to a large-volume super-wide concrete box girder pier top solid section counterweight concrete structure and a construction method of a mixed girder cable-stayed bridge. Background technique [0002] For long-span cable-stayed bridge structures, in order to balance the force on the cables on both sides of the main tower and prevent the main tower from shifting, it is necessary to carry out counterweight construction on the side spans of the cable-stayed bridge. For hybrid girder cable-stayed bridge structures, the side-span counterweight is often realized by increasing the concrete self-weight and adopting a mass concrete solid section structure. [0003] During the pouring process of the counterweight concrete structure, due to the heat of hydration of the cement and the low thermal conductivity of the concrete, the temperature difference between th...

AI Technical Summary

Problems solved by technology

[0003] During the pouring process of the counterweight concrete structure, due to the heat of hydration of the cement and the low thermal conductivity of the concrete, the temperature difference between the inside and the outside is too large, and the large-volume concrete structure is prone to early cracks, thereby reducing or even destroying the bearing capacity of the structure and affecting the stability of the concrete. sex and firmness

At present, the solution to this problem is mainly to use raw materials with low heat of hydration, reduce the construction temperature of raw materials and formwork, and arrange cooling water pipes to cool down. These methods reduce the impact of heat of hydration in mass concrete construction to a certain extent. But the effect is not ideal

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