Steel chimney construction technical scheme

General provisions for steel chimneys:

1. Steel chimneys include tower type, self-supporting type and cable type. Tall steel chimneys can be tower type, low steel chimneys can be self-supporting, and thin and tall steel chimneys can be cable-type.

2. The calculation of steel towers and cables can be carried out in accordance with the relevant provisions of the national standard "Code for Design of Tall Structures" (GB 50135).

3. The materials used first for steel chimneys should comply with the provisions of the national standard "Code for Design of Steel Structures" (GB 50017).

Steel chimney construction technical scheme:

1. One day before construction, prepare materials, tools, etc., and prepare for the start of construction.

2. During construction, the "Construction Safety Work Regulations" must be strictly implemented, the requirements of construction specifications for high-altitude operations must be strictly followed, to prevent falling objects from injuring people, and strictly implement the work monitoring system. , must strictly implement the construction site management system.

3. First analyze the chimney drawings.

1) Steel chimney construction is made of steel: the thickness of the steel plate is 16mm, the length is 20m, it is processed into a cylindrical shape with a diameter of 1.4m by a plate rolling machine, and then all seams are welded internally and externally. When welding, the welding slurry should be full. , No holes, smooth surface.

2) Among them, the bottom flange of the steel chimney construction is made of a plate with a thickness of 20mm, a hole diameter of 28mm, and is connected to the ground foundation with bolts of ￠26mm×100mm.

3) In the construction of the steel chimney, three equidistant fixed points are welded from the bottom to the top of the chimney from 5m to 20m, so as to connect the wind cable and the ground anchor point for connection and fixation.

4) A chimney foundation with a diameter of 2m and a depth (thickness) of 2.3m is poured with commercial concrete on the ground.

5) ￠16㎜ rebar is used for the chimney foundation reinforcement structure, the density of rebar is 24, and the upper and lower connections are bound with ￠12㎜ rebar.

6) The bolts for the construction of the foundation and the steel chimney are pre-buried in the reinforced concrete foundation, and the distance distribution is reasonable and even.

7) When the steel chimney is constructed and installed using a truck crane, when the chimney cylinder is connected with the foundation screws, it is fixed with double nuts. When the chimney is lifted to the corresponding position, the wind cable is pulled up to connect with the ground anchor, and the angle between the wind cable and the ground is not more than 60°.

8) After the overall hoisting and installation of steel chimney construction and welding, the inner and outer cylinders of the chimney should be fully painted and anti-corrosion. When painting, the surface of the chimney should be treated, and all the impurities in the weld slag should be cleaned up. The surface of the cylinder is smooth and smooth, and the color is bright.