Cold storage insulation system

1. External insulation system External insulation Internal structure form:

The main structural layer of the building is located on the inside of the insulation. The insulation material forms a continuous closed space, wrapping the main structure of the building in it.

Advantages: The combination of insulation and building envelope system saves space and investment.

The equipment and pipe hangings in the warehouse are directly connected to the main structure, eliminating the need for additional anti-cold bridge treatment.

The construction is convenient, fast and safe.

It can be developed into an integrated warehouse of shelves.

Disadvantages:

The room is not easy to divide

2. Internal insulation system

Internal insulation external structural form: The main structural layer of the building is located on the outside of the insulation. The insulation material forms a continuous closed space in the warehouse.

Advantages:

The warehouse is clean and easy to clean

Due to the presence of a suspended ceiling, the top is flat, making the room easy to divide

Disadvantages:

There is a cavity between the ceiling and the roof, increasing the height of the building

The two-tier system has increased investment

Insulation walls occupy internal space and reduce the actual usable area

All structural parts, cables, and hangings that wear ceilings and wall panels are prone to form cold bridges

Second, the choice of cold storage insulation materials

The construction area and environment of cold storage are different, and the thermal insulation materials required also have special requirements. Therefore, the application of suitable materials in different environments is the "best material".

Polyurethane and extruded board are widely used in large and medium-sized cold storage construction projects due to their good thermal resistance.

1. Rigid polyurethane foam cold storage board

This is a kind of thermal insulation material that can be foamed on site. It has the characteristics of small bubbles, small density, light weight, high strength, good thermal insulation effect, and relatively simple forming process. It has been widely used in cold storage and other projects in China. It can be prefabricated and sprayed or poured on site, which can make the thermal insulation layer seamless and sealed as a whole, and there is no "cold bridge" running cold phenomenon. It is a kind of thermal insulation material that is currently widely used and has great development prospects. This material also requires flame retardancy, and its oxygen index index shall not be less than 26 according to regulations.

2. Extruded board

Extruded board has the advantages of light weight, good thermal insulation performance, low temperature resistance, low cost, and low water absorption. Internationally, extruded board is considered "an ideal material in cold storage insulation engineering", characterized by high compression strength, long service life, and of course, high cost performance. Currently, it is widely used in cold storage floor insulation. Construction requires adhesive cutting. If pasted with petroleum asphalt, the temperature of the asphalt must be strictly controlled. If the temperature is too low, it will not stick firmly. If the temperature is too high, the foam will melt. Extruded board used for cold storage insulation also requires the product to have the performance of self-extinguishing from fire to meet the flame retardant requirements of fire protection.

Third, cold storage ground insulation, cold storage ground should have strong impact resistance, whether it is a large warehouse or a small warehouse, if the ground is the same as the wall panel and roof, generally no more than one year, the insulation layer will deform, crack, and leave the drum. The compressive strength of extruded board for flat storage ground insulation should not be less than 350 kPa, and the compressive strength of three-dimensional warehouse extruded board should not be less than 600 kPa. And the extruded board should be aged for more than 28 days after going offline to prevent deformation. The best practice at present is to lay a cushion on the ground, the cushion should be flat, and the error should not exceed 1cm. Then lay a PE moisture-proof layer, lay an extruded board in a staggered seam on it, lay a moisture-proof layer, and then hit reinforced concrete. You can apply calendering as you go, and you can choose the thickness of concrete and the size of steel bars according to the ground load.

The practice of floor in cold storage:

1. Ventilation layer (ventilated low wall or ventilated attic or ventilation pipe)

2. Cement thick plate (ventilation layer for ventilation low wall or ventilation pipe)

3. Moisture-proof and waterproof layer

4. Insulation layer (generally 200mm thick, extruded board or polyurethane foam board)

5. Leveling of reinforced concrete (generally 120mm thick for flat warehouses and 350mm thick for three-dimensional warehouses)