What is the function of the cement ventilation pipe buried under the floor of the cold storage?

The mud-free ventilation pipe buried under the floor of cold storage is mainly to prevent the floor from frost heaving, and the main reasons are as follows: \ x0d \ x0d \ 1. When the water in the soil under the floor of the cold storage meets the low temperature below freezing point, it will freeze. The floor of low-temperature cold storage will freeze, usually starting from the bottom of the outer wall. The closer to the center, the greater the freezing depth. \x0d\ 3。 The soil freezing under the terrace will cause the whole terrace to freeze and expand, and the strong stress of the terrace will exceed the load borne by the bottom of the cold storage foundation, leading to the destruction of buildings and the deformation and expansion of the ground. \ x0d \ x0d \ The treatment methods to prevent the floor from frost heaving are: \x0d\ 1, raised floor \x0d\ 2, natural ventilation or mechanical ventilation pipes \x0d\ 3, heating oil pipes and heating floor.