Cangzhou DoubleDragon Steel Pipe Co., Ltd., based in China, specializes in manufacturing helical seam pipes ranging from 8 to 140 inches in diameter and 6 to 26mm in wall thickness. Main production standards of pipes: API 5L, ASTM, EN 10219. Additionally, we offer options for coating and lining. With thirty years of experience, we offer expertise in production. We invite global friends to connect and inquire.

After the cement mortar work is completed, there is another important process, which is air drying. It means air drying in a natural state for 2-3 days. The main purpose is to prevent cracks in the cement mortar due to bumps during shipment.

Since the concrete filled in the steel pipe can absorb a large amount of heat energy, the temperature field of the pipe column section is very unevenly distributed when exposed to fire, which increases the fire resistance time of the column and slows down the heating rate of the steel column. Once the steel column yields, the concrete can Bear most of the axial load and prevent structural collapse.

The fire resistance of composite beams also increases because the temperature of the steel beam is reduced by transferring heat from the top flange to the concrete. Experimental statistics show that: compared with steel columns, meeting the 3-hour requirement for first-class fire resistance can save 1/3 to 2/3 or even more fire-retardant coatings. As the diameter of the steel pipe increases, more coatings are saved.

It has high bearing capacity, good ductility and excellent seismic resistance. Anti-corrosion pipes in cement mortar: The mixture of cement, sand and water is called cement mortar.
The commonly referred to 3-cement mortar is a mixture of 1 part cement and 3 parts sand. In fact, the water component is ignored. The ratio is generally around 0.6, which should be the purpose of 0.3 cement mortar. It is used in building drainage projects and industrial area drainage projects. , long-distance pipeline drainage projects, and municipal drainage projects, it has been favored and praised by the majority of construction parties.