Continuous pouring method for preventing cracking of arch part of large-volume concrete of huge-span underground cavern

Abstract

The invention discloses a continuous pouring method for preventing cracking of an arch part of large-volume concrete of a huge-span underground cavern. The continuous pouring method comprises the following steps that first, pouring pipes are arranged in the nearly horizontal section of a vault every 5+ / -0.5 m in the transverse direction and every 3+ / -0.5 m in the longitudinal direction, the distance between the pouring pipes and the vault is 20+ / -2 cm, and the height difference between the pouring pipes at the leftmost edge and the rightmost edge and the pouring pipe in the central line is 30-70 cm; second, self-compacting concrete is prepared; third, the side wall concrete on the left side and the right side of the huge-span underground cavern is poured firstly, and the longitudinal length of each time of concrete pouring is 10+ / -0.5 m; fourth, the self-compacting concrete is adopted for synchronously pouring arch shoulder sections on the left side and the right side of the arch part;and fifth, the self-compacting concrete is adopted for pouring the nearly horizontal section of the vault, symmetrical pouring is conducted from the edge to the middle in the transverse direction, sequential pouring is conducted from inside to outside in the longitudinal direction, and the pouring pipes are reserved in the concrete after pouring and not taken out. The hydration heat peak value ofthe concrete in the nearly horizontal section of the vault is decreased, so that cracking is avoided, and the engineering quality and the construction efficiency of the huge-span underground cavern are improved.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a pouring method for large-volume concrete in a giant-span underground cavern, which can prevent the arch from cracking after the giant-span underground cavern is poured. Background technique [0002] In recent years, the volume of concrete projects in domestic construction projects has been increasing day by day, and engineering accidents caused by the hydration heat of large-volume concrete have occurred from time to time, which not only seriously affected the quality of the project, but also caused economic losses for the unit. Huge and thick construction projects make it necessary to grasp the overall situation in the application of large-volume concrete pouring construction technology. The high heat of hydration and large concrete structure volume can easily lead to uneven heat dissipation inside the concrete, which eventually leads to the appeara...

AI Technical Summary

Problems solved by technology

[0004] The invention aims to solve the problem of difficult concrete pouring and cracks in the near-horizontal section of the vault of the giant-span underground cavern

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