Anti-cracking method for butt joint of prefabricated immersed tube concrete members

Abstract

The invention discloses an anti-cracking method for butt joint of prefabricated immersed tube concrete members. The method comprises the following steps that a heating mechanism is preset at the end,linked with a new concrete member, of an old concrete member, the end part of the old concrete member is heated to a peak temperature greater than or equal to a pouring temperature of the new concretemember, and the temperature is kept unchanged; the new concrete member is poured so that the new concrete member is linked with the end part of the heated old concrete member; and when the pouring temperature of the new concrete member reaches a peak value, the heating mechanism is closed, so that the end part of the old concrete member and the new concrete member start to be synchronously cooledfrom the same temperature peak value. According to the method, the operation is simple and convenient, the construction operation is convenient, and the effect of reducing the cracking risk of prefabricated immersed tube concrete is obvious.

Description

technical field [0001] The invention belongs to the field of prefabricated immersed tube construction, and in particular relates to an anti-cracking method for butt joint of prefabricated immersed tube concrete components. Background technique [0002] The prefabricated immersed tube structure is the most common cross-sea and cross-river underwater tunnel structure. The crack control of prefabricated immersed tube is one of the most important technical issues in the technical requirements of immersed tube. Since the immersed tube pouring often adopts the integral pipe joint process, the end faces of different pipe joints are connected to each other, and the layered pouring technology is used to directly pour the new concrete components at the ends of the old concrete components, and the old concrete components are formed by pouring. Expansion under the influence of heat will form a squeeze effect on the new concrete components, that is, a binding force, which will easily ca...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to solve the problem of cracking of new concrete components caused by layered pouring, by preheating the old concrete components to a peak temperature close to or higher than the peak temperature of the new concrete component pouring process, when the new concrete components to be poured are cooled , so that the old concrete components and the new concrete components are cooled synchronously from the same temperature range, so that the cold shrinkage of the old concrete components and the new concrete components is synchronized, and the two are not synchronized to avoid mutual extrusion and cracks

Images