The technical problems of directly buried steam pipeline, such as sliding structure, insulating structure, external anticorrosion coating of outer protection steel pipe, fixed support, removal moisture pipe, steam trap pipe, and its installation and operation are discussed with the engineering example.

Points out the importance of correct calculation of the acting forces on fixed supports at the riser pipe of a water system in high rise building air conditioning.

Based on the analysis of the theory of seismic isolation of bridges,a practical seismic isolation design of the fixed bearing of continuous girder bridges is presented,which changes the fixed bearing into the relatively fixed one.

The technique of directly buried steam pipeline such as insulation construction, insulating material, outside protective pipe, fixing support, compensator, and steam trap connections is discussed.

Combined with the producing practice,this paper introduces its working principle and process of the spot welding of wiper fixed bracket and the factors influencing the welding quality.

The bending technology of fixed bracket for the tube of excavator was analyzed.