As an underground/semi underground municipal and building supporting structure, box culvert has the characteristics of large cross-sectional size, closed (or semi closed) structure, high concrete consumption, and complex exposed surface (inner wall+outer wall+top plate+bottom plate).
The core focus of maintenance is to control temperature difference, continuously moisturize, and balance internal and external synchronous maintenance, to prevent surface cracks and through cracks caused by insufficient humidity and large temperature difference, and to ensure that the concrete strength meets the standard and durability meets the design requirements.
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