Polyurethane is a general term for polymer compounds containing repeating urethane groups in the main chain. It consists of organic diisocyanates or polyisocyanates and dihydroxy or polyhydroxy compounds.
The storage of polyurethane screen building materials and steel should be stacked separately according to different steel types, furnace numbers, varieties, specifications, lengths and different technical indicators. Useable surplus materials returned should also be used according to the material pile. All steel materials should be moisture-proof, acid and alkali resistant. Corroded steel should be stacked separately, derusted in time, and put into use as soon as possible.
Cement should be stored separately according to different manufacturers, varieties, brands and delivery dates. During on-site storage, care must be taken to protect against water and moisture. Adhere to the principle of first-in-first-out. Bulk cement should be stored in sealed tanks. Mixing of different varieties and grades is strictly prohibited.
Timber warehouses should be stacked separately according to tree species, wood type, specification, grade, length, new and old. Clean up the site, remove debris, and set up 4,000 units! on pile foundation. Ventilation space should be left when stacking; pay attention to fire protection, moisture resistance, corrosion protection, moth protection, and avoid cracking and warping in the sun.
For the storage of polyurethane screen construction materials, sand and gravel should be stacked and stored near the project usage location or mixing station according to the construction plan, and the specifications and quantity should be indicated on the stacking label. The ground should be flat and solid, and the sand and gravel should be piled into a square flat top to facilitate the square I of the ruler to prevent sewage and liquid resin from infiltrating into the sand and gravel pile. Colored stones or white stones are usually shipped in woven bags. If it comes in bulk, it should be washed and used.
Petroleum asphalt should be stored separately according to its variety and grade. Petroleum asphalt is flammable and prone to aging and deterioration. Measures should be taken to protect against wind, sun and rain.
The storage of reinforced concrete components should be stacked in stages according to the locations specified in the floor plan. The site should be leveled, compacted, and placed as close as possible to the tower crane’s rotation radius. When stacking, the distribution of the main ribs should be clear and should not be placed upside down. Do not stack them too high. The position of the upper and lower skids should be vertical and in the same position. 6 According to the specification and model, combined with the construction sequence and progress, the first used ones should be stacked on the rock wool screen.