The installation of LED display steel structure is a relatively complex and comprehensive technology with many contents and wide scope. Combined with some steel structure projects, the basic principles and applicable conditions for the design of steel structure hoisting schemes are expounded, and the feasibility of conventional installation methods and corresponding technical measures are summarized.

With the continuous development of science and technology, the shapes and structural forms of steel structures are becoming more and more complex, which brings new challenges to the design and construction of steel structures. Many mature and advanced process methods have gradually become construction methods, which have promoted the development of the steel structure industry.

Due to market reasons, steel structure installation accidents and violations occur from time to time, causing unnecessary economic losses and social impact. In order to further improve the overall level of steel structure construction and promote the development of the industry, in addition to strengthening construction site management, steel structure construction should also conduct research and summaries on construction organization design, program technical measures, etc.; vigorously promote new technologies and new processes; and target project characteristics. , choose advanced, reliable and economical construction solutions.

1. Basic principles of LED screen steel structure hoisting scheme
1. Policy: Based on drawings and norms, strictly implement relevant national production safety regulations.
2. Reliability: Adhere to safety, ensure the feasibility of program implementation, and increase its reliability. No matter which method is adopted, we must first consider whether the program has successful precedents and supporting equipment. Otherwise, program demonstration must be carried out. Conduct construction check calculations based on structural characteristics to prove whether the structural stability, rod stress and deformation of this method meet the requirements during the construction stage. Whether the mechanical equipment used can meet the installation requirements. Whether the construction site conditions are met, such as whether the civil construction environment and surrounding structures restrict the implementation of the plan, etc.
3. Advancement: With the development of science and technology, new processes, new technologies, and new equipment in the field of structural installation are emerging one after another. For example, the advent of large-tonnage cranes, computer synchronous control of overall lifting and sliding technology have added a new chapter to structural installation. Especially for large-scale steel structure projects, when site conditions and structural forms permit, the application of new technologies and new processes should be vigorously promoted; the amount of high-altitude operations should be minimized and the installation efficiency of steel structures should be continuously improved.
4. Economy: A good installation plan should be simple in method, appropriate in measures, high in efficiency, low in construction cost, wide in application, and able to withstand review and testing. Therefore, we must adhere to the principle of program comparison, conduct technical and economic analysis, and choose a program with a short construction period and low cost.

2. Applicable conditions for LED screen steel structure hoisting scheme
Due to the inconsistency of architectural shapes and structural forms and the wide variety of construction site conditions, it can be said that no one construction method or plan is suitable for the installation of any steel structure project, so each installation method has its own supporting conditions.
Commonly used installation methods for grid structures include: high-altitude bulk installation method, strip and block installation method, structural sliding method, support frame sliding method, overall hoisting method, overall lifting method, etc.
1. Consider the process method: Understand the characteristics of the structural form, structural weight, installation height, span, etc., and try to use mature and advanced installation processes based on the actual situation on site.
2. Consider according to lifting equipment: first choose your own equipment, make full use of on-site lifting equipment, and secondly rent it nearby. General situation: when the number of components is small, truck-type cranes are often used; for gantry frame lifting, small and medium-sized truck-type cranes are often used; when the installation period is long, the installation height and turning radius are large, crawler cranes are more economical than truck-type cranes; overall Hydraulic synchronous lifting (ejector) devices are often used for hoisting and sliding; tower cranes are generally used for the installation of medium and high-rise steel structures; gantry cranes and bridge erecting machines are mostly used for ordinary bridge installations.
3. Inversion method construction: The inversion method is a special installation process that goes up first and then down. It is suitable for structures with large heights, such as steel towers, masts and other structures. When it is difficult for a conventional crane to get close to the crane for lifting, the inversion method is generally used. When using this method, it is important to consider the overall stability of the structure and the stability of the equipment itself during the installation process, and reliable support and stability measures must be taken. Structural sliding method – The structural sliding method has been developed to use hydraulic pushers and computer synchronous control technology, which is a step more advanced than the past grid sliding method. Its applicable conditions are: due to site conditions, cranes and support frames cannot be installed in the span; second, the structural support conditions are conducive to laying the slip track; third, the strength and stiffness of the slip unit structure determined by calculation are both Meet the requirements; fourth, understand the structural support form and fixing method; fifth, the longer the longitudinal slip route, the higher the efficiency. Support frame sliding method – its applicable conditions are occupying the inner span site, low installation height, large structural area or long longitudinal length. , when the installation height is below 15 meters, ordinary fastener-type steel pipe scaffolding or bowl-type scaffolding can be used as the support frame; secondly, when the frame body is higher and the load-bearing capacity is large, a profiled steel support frame should be used. No matter which plan is adopted, in addition to complying with the specification requirements, the horizontal dynamic load must also be considered during design calculations. If necessary, large diagonal braces should be added to improve its overall stability.
4. Overall lifting method: The overall lifting method currently uses computer synchronous control and hydraulic lifting equipment developed by Tongji University. This process has gradually replaced the through-core motorized lifting and jack lifting solutions. Its equipment is lightweight and technologically advanced. Its applicable conditions are: it occupies the space within the span; second, the installation height is high; third, the components are heavy; fourth, it is limited to vertical lifting and cannot move horizontally. That is, the higher the installation height, the heavier the lifting weight, and the better the effect.
5. Earth hoisting: Earth hoisting uses unicorn bars, herringbones, reels, pulleys, etc. as lifting equipment for structural hoisting. It is suitable for projects with heavy components, a small number, and high installation heights. As there are more and more large-tonnage lifting equipment and advanced installation techniques, there are fewer and fewer local hoisting methods.
6. Rotation method construction: This method is mainly used for bridge installation. Due to the influence of railways, highway traffic, and special environments such as mountains, rivers, and rivers, when other bridge erection methods are restricted, rotation method construction is often used.
7. Overall lifting method: It is basically similar to the overall lifting method, except that the lifting equipment is different, and it is suitable for the installation of small and medium-sized structures. In the early days, multiple one-legged bars or herringbones, winches, pulley blocks and cable wind systems were used for large-tonnage hoisting. Nowadays, due to the large number of large-tonnage cranes, multiple cranes are used for centralized lifting and installation of small and medium-sized projects according to needs.