Winter concrete pouring antifreeze measures mainly include heat storage method and greenhouse method.Heat storage method is generally applicable to the temperature in - 10 ℃ above, greenhouses method is suitable for the temperature in a below 10 ℃.

Heat storage method is to use materials with low thermal conductivity on the outer surface of concrete casting blocks for thermal insulation, and the heat source is the heat added to the concrete component materials and the heat of cement hydration.The formwork for construction shall be thermal insulation formwork, and the concrete top surface after pouring shall be immediately covered with thermal insulation material.The heat storage method is essentially the surface insulation method, which is consistent with the surface protection of concrete dam in form.But their purposes and requirements are different.The purpose of surface protection is to prevent surface cracks in concrete. It requires that the internal surface temperature difference of concrete should not exceed the allowable standard.The purpose of heat storage method is to prevent the freezing damage of concrete surface.

Greenhouses method in the concrete pouring position, build greenhouses, relative usually use steam exhaust pipe or heater heating, keep the relative temperature in 0 ~ 5 ℃ or so.

The greenhouse is mainly composed of the canopy, supporting structure and the enclosure structure of the insulation layer.We usually adopt three models.

Bind type warm shed is a kind of simple warm shed.The precast concrete column of 10 250px is used as the support, with the height of 3.5 ~ 4.om.Canopy cover USES log to bind on the spot.The insulation layer adopts straw curtain, straw cushion and canvas, etc.The concrete discharge opening of the roof is provided with movable discharge opening cover, and the grass mat is wrapped in the hessian bag to keep warm.

Modular greenhouse, the roof of which is assembled by a single sheet steel truss.Because of its large span, the supporting structure can be set outside the formwork.The roof shall also be provided with a concrete discharge opening and a movable discharge opening cover.

Prefabricated heating shed mainly includes steel truss composite beam, finalizing heat preservation supporting structure, hoisting structure and enclosure structure, etc.The entire canopy is a whole lifting unit.Its main advantage is convenient installation and removal.

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