Generally, JIS G3461 STB 510 seamless steel pipe will show great deformation in the temperature of 450 to 650℃, which will lead to the bending of steel column and steel beam and loss of bearing capacity. Assuming no fire prevention and cooling maintenance measures are taken, the fire resistance limit of JIS G3461 STB 510 seamless steel pipe is 15 minutes, so fire prevention and cooling measures should be taken.
There are three ways:
1. Water filling: internal flushing of hollow seamless steel pipe is an effective measure for fire prevention and cooling. Water can absorb heat in JIS G3461 STB 510 seamless steel pipe, and cold water can also be introduced into the pipe. The temperature of JIS G3461 STB 510 seamless steel pipe is kept at a lower temperature.
2. Outer coating: add an outer layer to JIS G3461 STB 510 seamless steel pipe, which can be sprayed or cast-in-place to prevent fire and reduce temperature.
3. JIS G3461 STB 510 seamless steel pipe is placed in the wall or ceiling composed of refractory material, and the fireproof effect is achieved through refractory material, which is a very economic method.
At present, many high-rise buildings will use JIS G3461 STB 510 seamless steel pipe material, assuming that the fire is difficult to extinguish in a short time, so fire prevention and cooling measures should be taken in the architectural design.
