The steel structure of LED electronic screen is divided into many types, the most common ones are wall-mounted installation and column. LED electronic screen can also be installed in mosaic type, cantilever hoisting, bridge type installation, etc. Each steel structure of LED electronic screen should be combined with the site environment Design, welding and acceptance according to the actual needs of Party A. Due to market reasons, installation accidents and violations of the steel frame structure of LED electronic screens occur from time to time, causing unnecessary economic losses and social impacts. In order to further improve the overall level of LED electronic screen steel frame structure construction and promote the development of the industry, in addition to strengthening construction site management, steel frame structure construction should also conduct research and summary in terms of construction organization design, program technical measures, etc., and vigorously promote new technologies and new technologies. According to the characteristics of the project, an advanced, reliable and economical LED electronic screen steel frame construction plan is selected.
1. Applicable conditions for the steel frame structure scheme of the LED electronic screen Due to the inconsistency of the architectural shape and structural form, the conditions of the construction site vary widely. Each installation method has its own support conditions. Commonly used installation methods for steel frame structures include: high-altitude bulk installation method, strip and block installation method, structural sliding method, support frame sliding method, overall hoisting method, and overall lifting method. Consider according to the process method: understand the steel structure form, structure weight, installation height, span and other characteristics of the LED electronic screen, and choose mature and advanced installation technology as far as possible in combination with the actual situation of the LED electronic screen installation site of Party A.
Flip-chip construction: The flip-chip method is a special installation process that goes up first and then down. It is suitable for LED electronic screen steel structures with large aspect ratios, such as steel towers, masts and other structures. In the case that it is difficult for a conventional crane to be hoisted close by, the upside-down method is generally used. When adopting this method, it is necessary to focus on 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 slip method - The structural slip method has been developed to adopt hydraulic pusher and computer synchronous control technology, which is one step more advanced than the grid slip method in the past. Its applicable conditions are: first, due to the limitation of site conditions, cranes and support frames cannot be installed in the span; second, the structural support conditions are conducive to the laying of sliding tracks; third, the strength and strength of the sliding unit structure determined by calculation The stiffness meets the requirements; fourth, understand the form and fixing method of the steel structure of the LED electronic screen; fifth, the longer the longitudinal sliding route, the higher the efficiency. Support frame sliding method - its applicable conditions are to occupy the inner space of the span, the installation height is low, the steel structure area of the LED electronic display is large or the longitudinal length is long.
First, when the installation height is below 15 meters, ordinary fastener-type steel pipe scaffolding or bowl-shaped scaffolding can be used as the support frame; second, when the frame body is high and the load-bearing capacity is large, the steel support frame should be used. No matter which scheme is adopted, in addition to the requirements of the code, the design and calculation should also consider the horizontal dynamic load, and if necessary, add large diagonal braces to improve its overall stability. Consider the lifting equipment: first, choose your own equipment, make full use of the on-site lifting equipment, and then rent the nearest one.
General situation: When the number of steel structure components of the LED electronic screen is small, truck-mounted cranes are mostly used; small and medium-sized truck-mounted cranes are mostly used for hoisting portal frames; The overall hoisting and sliding mostly use hydraulic synchronous lifting (jacking) devices; the installation of middle and high-rise LED electronic screen steel structures generally uses tower cranes; the installation of ordinary bridges mostly uses gantry cranes and bridge erecting machines. Indigenous method of hoisting: Indigenous method of hoisting is to use single-angle poles, herringbone frames, winding machines, pulley blocks, etc. as lifting equipment for structural hoisting. It is suitable for LED electronic screens with heavy steel structure components, small quantities, and high installation heights. engineering. Due to the increasing number of large-tonnage lifting equipment and advanced installation techniques, there are fewer and fewer local methods of hoisting.
Overall lifting method: The overall lifting method currently mostly uses computer synchronous control and hydraulic lifting equipment developed by Tongji University. This process gradually replaces the core-through motorized lifting and jack lifting schemes. The equipment is light and the technology is advanced. Its applicable conditions are: first, it occupies the inner space of the span; second, the installation height is high; third, the components are heavy; fourth, the steel structure of the LED electronic screen is limited to vertical hoisting and cannot be displaced horizontally. That is, the higher the installation height and the heavier the lifting weight, the better the effect.
Overall hoisting method: It is basically similar to the overall hoisting method, except that the lifting equipment is different, and it is suitable for small and medium-sized structure installation. In the early days, multiple single-legged poles or herringbone frames, hoists, pulley blocks and cable wind systems were used for large-tonnage hoisting. Now, due to the large area of the LED electronic screen, the area and weight of the steel structure will increase accordingly. For small and medium-sized projects, multiple cranes are selected for centralized lifting and installation as needed.
Rotation method construction: This method is mainly used in the installation of expressway bridges. Due to the influence of railway, highway traffic, and special environments such as mountains, rivers and ditches, when other bridge erection methods are restricted, the rotation method is often used for construction. Second, the basic principles of the steel frame structure scheme of the LED electronic screen 1. Policy: Based on the drawings and norms, strictly implement the relevant national safety production regulations. 2. Reliability: Adhere to safety first, ensure the feasibility of program implementation and increase its reliability.
No matter which method is adopted, it is first necessary to consider whether the scheme has successful precedents and supporting equipment, otherwise, the LED electronic screen steel structure scheme must be demonstrated. According to the structural characteristics, the construction check calculation is carried out to prove whether the stability of the structure, the stress and deformation of the members meet the requirements during the construction stage of the method. 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. Economy: Individual LED electronic screen steel structure installation schemes should have simple methods, appropriate measures, high efficiency, low construction cost, wide application range, and can stand the review and test. 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.
4. Advancement: With the development of science and technology, new processes, new technologies and new equipment in the field of steel structure installation of LED electronic screens emerge in an endless stream. 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 LED electronic screen steel frame structure projects, when site conditions and structural forms permit, new technologies and new processes should be vigorously promoted; the amount of high-altitude operations should be reduced as much as possible, and the installation efficiency of steel frame structures should be continuously improved.