| The steel structure roof of the industrial plant adopts the large-span space truss structure,with the total weight of the steel structure of about 12000 tons.The construction period of the main truss system is about 75 days.The construction period is tight,and the truss weight is heavy,the span is large,and the welding quality of the full penetration primary weld is high.The truss ground assembly site is limited and not centralized,and the installation position of the steel structure truss is located on the concrete column above the waffle board The heavy crane can’t stand and the safety risk of high-altitude operation is high,so the conventional "high-altitude scattered assembly" installation process can’t meet the construction requirements.After analyzing the "sliding method","multi machine lifting method" and the requirements of construction period and calculating the cost of measures,the installation process of "high-altitude overall roll on" is adopted for construction.The installation method uses the five longitudinal module car set on the waffle board to transport the truss roll on unit to the installation axis position through the module car and bracket,and then uses its own hydraulic lifting system to lower the truss components to the installation position elevation for unloading,and then fixed welding to complete the installation of the unit truss.The whole process of roll off is controlled by computer,and stress monitoring is carried out on the important parts of steel truss and waffle plate to ensure the stability and safety of roll off process.Due to the adoption of the installation technology of ground sectional assembly and high-altitude overall roll assembly,the welding of the assembly area set up on site can implement the standardized management of factory type steel structure production,which not only improves the environment of the construction area,but also benefits the welding quality of the components;the high-altitude roll assembly construction and installation are reliable,ensuring the installation accuracy and precision control in the roll assembly process,and effectively reducing the vertical intersection The safety risk of cross operation,combined with the requirements of rush construction,not only speeds up the overall construction progress of the industrial plant,but also reduces the construction cost.Through the application research of the whole roll on process of the steel structure roof of the industrial workshop,from the aspects of construction technology,site layout,construction period arrangement,cost control and so on,the configuration requirements of construction machinery and equipment are analyzed and determined through calculation,so as to solve the problems of installation technology,welding quality control,component management and high-altitude roll on of such large and heavy truss steel structure roof,especially for the later large-scale buildings in China The construction of heavy steel structure roof,such as type I industrial workshop and electronic clean workshop,has a wide application and development prospect. |
