Method for controlling temperature stress cracks of curved ultrahigh bridge pier body

Abstract

The invention discloses a method for controlling temperature stress cracks of a curved ultrahigh bridge pier body. The method comprises the steps as follows: setting the curved ultrahigh bridge pier body to be built as a column-plate type hollow structure; mainly selecting low-hydration-heat Portland slag cement as a concrete material for pouring the pier body; and then performing the construction operation with the following method: firstly, performing concrete pouring on the pier body with a layered pouring method, setting up a pouring formwork, meanwhile, controlling the molding temperature of the layered pouring concrete, embedding a temperature measuring component and a radiating pipe, acquiring surface temperature information and central temperature information of the bridge pier body concrete by the temperature measuring component, and when the difference value between the surface temperature and the inner central temperature of the pier body concrete reaches a set value, controlling the difference value between the surface temperature and the inner central temperature within an ideal range by using a cooling treatment method of radiating of the radiating pipe. The method is simple in control measure and convenient to operate, the construction quantity and the construction cost can be reduced, and the temperature stress cracks can be prevented.

Description

technical field [0001] The invention relates to a method for controlling temperature stress cracks of bridge buildings, in particular to a method for controlling temperature stress cracks of curved super-high type (for example, the height is greater than 100 meters) bridge piers. Background technique [0002] After being exposed to the sun, the temperature of the side of the curved pier body of the bridge pier will be significantly higher than that of other parts, and the temperature gradient will be non-linear; while encountering natural phenomena such as sudden rainstorm, cold air invasion, sunset, etc., the outer surface of the concrete structure of the pier body will be damaged. The temperature drops suddenly, but because the temperature inside the concrete changes slowly, it will further lead to the occurrence of temperature gradients. In addition, in the process of pouring concrete for the pier body, the cement will release a large amount of heat during the hydration p...

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Problems solved by technology

[0004] However, in the construction of bridges across large deep valleys, it is sometimes necessary to build curved piers over 100 meters high. Due to the long body of such piers and their curves, the rotational stiffness of such piers is small. In addition, the volume of concrete poured by such piers Larger, the cement will release a lot of heat when hydrating, so the cracks caused by temperature changes caused by natural causes, cement hydration and other factors cannot be ignored, especially for curved piers, cracks may make the design of the pier. Changes that affect the strength and stability of the entire bridge

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