Construction method for controlling floating of core mold of cast-in-place box girder

Abstract

The invention discloses a construction method for controlling floating of a core mold of a cast-in-place box girder, which relates to the technical field of bridge engineering construction. According to the construction method for controlling floating of the core mold of the cast-in-place box girder, the core mold and a box girder bottom mold are included, the core mold comprises a core mold bottom mold and a turning cover, the core mold bottom mold is arranged on the box girder bottom mold, core mold side molds are arranged on the two sides of the top of the core mold bottom mold, exhaust windows are formed in the core mold side molds, the turning cover is arranged on the exhaust windows, and one end of the turning cover is hinged with the side mold of the core mold through a movable bolt. According to the construction method for controlling floating of the core mold of the cast-in-place box girder, the exhaust window is arranged for exhausting to reduce concrete gas buoyancy, the positioning bolt is arranged for fixing, the buoyancy influence generated by solid-liquid concrete inflow is reduced, the limiting supporting frame is used for limiting and counteracting lateral displacement of the inner mold of the core mold, and floating of the core mold of the cast-in-place box girder is avoided.

Description

technical field [0001] The invention relates to the technical field of bridge engineering construction, in particular to a construction method for controlling the floating of a mandrel for a cast-in-place box girder. Background technique [0002] During the construction process of the cast-in-situ box girder bridge erected by the full support, when the support is erected and the box girder mandrel is installed, the box girder concrete pouring begins. However, during the pouring process, the concrete is in a state of solid-liquid mixing and flowing Generate buoyancy. When the buoyancy is greater than the self-weight of the mandrel, it will often cause floating phenomenon, which will cause the mandrel to shift. If the size of the protective layer of the steel bar is too small, it will cause the phenomenon of leaking reinforcement, and if it is serious, it will affect the force of the bridge structure. Based on this, a A construction method of controlling the floating of the ma...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a construction method for controlling the floating of the mandrel of the cast-in-place box girder, which solves the problem that during the construction process of the cast-in-place box girder bridge erected by the full support, when the support is erected and the box girder mandrel is installed, The concrete pouring of the box girder was started, but in the pouring process, before the initial setting of the concrete, it was in a solid-liquid mixed state, and buoyancy was generated in the flowing state. When the buoyancy force was greater than the self-weight of the mandrel, it would often cause a floating phenomenon, which caused the mandrel to shift. question

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