Control method for cracks in side wall of pipe gallery box type tunnel

Abstract

The invention belongs to the field of construction, and particularly relates to a control method for cracks in a side wall of a pipe gallery box type tunnel and application. The method includes the steps that construction segmentation is conducted on the pipe gallery box type tunnel; and then segmented pouring is conducted in each construction segment in the longitudinal direction, wherein a construction joint of each construction segment is formed in the junction of a wall body and a top plate in the vertical direction, a two-step pouring manner is adopted, one-time pouring is conducted on a bottom plate, the side wall and a middle wall as a whole in the first step, concrete is poured on the top plate in the second step, and pouring is conducted on a middle pipe gallery transverse partition plate subsequently. According to the method, through optimization of construction processes of obtaining the reasonable segment length, arranging the construction joint position, obtaining the pouring time interval and obtaining the concrete pouring mode, the cracks and the appearance quality of concrete of the side wall are effectively controlled, and the 120-year service life of the concrete structure is sufficiently ensured.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a method and application for controlling cracks in a side wall of a box-shaped tunnel in a pipe corridor. Background technique [0002] Buried section tunnel projects, especially those in a typical offshore island environment, have complex technologies, high environmental protection requirements, high construction requirements and standards, and relatively difficult construction. The cast-in-situ buried section tunnel is a box-type mass concrete structure with pipe gallery. If the side wall and floor of the buried section tunnel are below sea level and will be soaked in seawater for a long time, strict requirements are imposed on the durability, impermeability and crack resistance of the concrete. [0003] There are special difficulties in concrete crack control of cast-in-situ buried tunnels, which are mainly reflected in the following points: [0004] (1) Due to the lar...

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Problems solved by technology

[0004] (1) Due to the large size of the cast-in-situ buried tunnel, the one-time concrete pouring volume is large, which puts forward higher requirements for the design and reinforcement of the concrete formwork, as well as concrete preparation and pouring construction. Vertical step-by-step pouring construction technology must be adopted, and the step-by-step concrete pouring can easily lead to stress cracks due to out-of-sync shrinkage;

[0005] (2) The size of the transverse section is large and the pouring is difficult;

[0006] (3) The bottom of the tunnel in the cast-in-place buried section is subject to the restraint stress of the foundation, and the side wall concrete is prone to vertical cracks;

[0007] (4) The environmental conditions of cast-in-place construction are uncontrollable and greatly affected by the ambient temperature, which is not conducive to cracks and construction control

[0008] During the construction of similar structures in other domestic projects, the concrete structures have produced cracks and appearance quality problems of varying degrees, which have a negative impact on the quality of the project. However, due to the lack of systematic research, no systematic solutions have been found for this type of engineering structure. Concrete Crack Control and Construction Quality Control Methods

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