Industry standard and application of steel frame structure for LED electronic screen

Time:2019-01-03 Views:39

LED electronic screen steel structure can be divided into many types, the most common is the wall installation and column, LED electronic screen can also be Mosaic installation, cantilever lifting, bridge installation, etc., each LED electronic screen steel structure should be combined with the site environment and the actual needs of party a for design, welding and acceptance.

Due to market reasons, LED electronic screen steel frame 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 LED electronic screen steel structure construction, promote the development of the industry, the steel structure construction, besides strengthening the construction site management should also be in such aspects as construction organization design, project technical measures study summary, vigorously promote new technology, new technology, in view of the engineering characteristics, select advanced, reliable, economic, LED electronic screen steel construction plan.

1. Applicable conditions for steel frame structure scheme of LED electronic screen

Due to the disunity of architectural modeling and structural form, the construction site conditions vary greatly. It can be said that there is no one construction method or scheme applicable to the installation of any LED electronic screen steel structure project, so each installation method has its own supporting conditions.Common installation methods of steel frame structure are: bulk method at high altitude, installation method by pieces, sliding method of structure, sliding method of support frame, integral lifting method, integral lifting method, etc.

According to the process method: understand the characteristics of LED electronic screen steel structure, structure weight, installation height, span, etc., combine with the actual situation of party a‘s LED electronic screen installation site to try to choose mature and advanced installation technology.

Inverted construction: inverted construction is a kind of special installation technology, which is suitable for LED electronic screen steel structure with large height-width ratio, such as steel tower, mast and other structures.Conventional crane is difficult to close to the lifting of the case, the general use of inversion method.When adopting this method, it is necessary to consider the overall stability of the structure and the stability of the equipment during the installation process.Structure sliding method -- the structure sliding method has been developed to use hydraulic jacking device and computer synchronous control technology, which is one step more advanced than the past grid sliding method.Its applicable conditions are: first, due to the limitations of field conditions, the span can not be set up crane and support frame;Secondly, the supporting condition of the structure is favorable for laying sliding track.Thirdly, the strength and stiffness of the sliding element structure calculated meet the requirements.Fourth, understand the steel structure support form and fixation method of LED electronic screen;Fifth, the longer the longitudinal slip path, the higher the efficiency.Support frame slip method -- it is suitable for use across the internal site, the installation height is low, LED electronic display screen steel structure area is large or longitudinal length is long.First, when the installation height is less than 15 meters, the general clamp-type steel pipe scaffold or bowl scaffold can be used as the support frame;Second, for the frame body is higher, and the bearing force is larger, it is appropriate to choose the section steel support frame.No matter which scheme is adopted, in the design and calculation, in addition to the requirements of the specification, horizontal dynamic load should also be considered, and large diagonal brace should be added when necessary to improve its overall stability.

According to lifting equipment consideration: first choose their own equipment, make full use of on-site lifting equipment, then nearby rental.General situation: when the number of steel structural members of LED electronic screen is small, truck crane is often used;Gantry frame hoisting more small and medium-sized truck crane;Crawler crane is more economical than truck crane when the installation period is longer, the installation height and the rotary radius are larger.Hydraulic synchronous hoist (jacking) is used for lifting and sliding of the whole unit.Tower crane is generally used for installation of medium and high LED electronic screen steel structure;Gantry cranes and bridge erecting machines are commonly used in the installation of ordinary Bridges.

Earth method hoisting: earth method hoisting is to use single-angle bar bar, herringbone frame, winder, pulley block and other lifting equipment as lifting equipment for the structure hoisting, it is suitable for LED electronic screen steel structure components heavy, small number, high installation height of the project.Due to the large tonnage lifting equipment and advanced installation technology more and more, so the earth method lifting is less and less.

Integral hoisting method: at present, the integral hoisting method mostly adopts the computer synchronous control and hydraulic hoisting equipment developed by tongji university. This technology gradually replaces the piercing heart type motorized hoisting and jacking scheme, which is light in equipment and advanced in technology.It is suitable for the following conditions: first, occupation of the cross-internal site;Second, the installation height is relatively high;Third, the component is heavier;Fourth, LED electronic screen steel structure is limited to vertical lifting, not horizontal displacement.Namely, the higher the installation height, the heavier the lifting weight, the better the effect.

Integral hoisting method: it is basically similar to the integral lifting method, but the lifting equipment is different, suitable for small and medium-sized structure installation.In the early stage, multi-independence foot bar or herringbone, hoist, pulley block and cable wind system were used for large-tonnage hoisting.Now, due to the large area of LED electronic screen, steel structure area and weight should be increased correspondingly, small and medium-sized projects according to the need to choose multiple cranes for centralized lifting and installation.

Rotary construction: this method is mainly used for highway bridge installation, due to the impact of railway, highway traffic, as well as mountains, rivers, trenches and other special circumstances, other bridge methods are limited, the use of rotary construction.

Ii. Basic principles of steel frame structure scheme of LED electronic screen

1. Policy: strictly implement relevant national laws and regulations on production safety based on drawings and norms.

2. Reliability: adhere to safety first, ensure the feasibility of the implementation of the scheme, and increase its reliability.No matter which method is adopted, whether there is a successful precedent and supporting equipment for this scheme should be considered first, otherwise it is necessary to demonstrate the steel structure scheme of LED electronic screen.According to the structural characteristics of the construction check calculation, it is proved that the method in the construction stage of the stability of the structure, the stress and deformation of the bar members meet the requirements.Whether the mechanical equipment used can meet the installation requirements.Whether the construction site conditions are satisfied, such as whether the civil construction environment and surrounding structures restrict the implementation of the scheme.

3, economy: individual LED electronic screen steel structure installation scheme should be simple method, appropriate measures, high efficiency, low construction cost, wide application range, can withstand the examination and test.Therefore, we must adhere to the principle of scheme comparison, carry out technical and economic analysis, and choose the scheme with short construction period and low cost.

4. Advancement: with the development of science and technology, new processes, technologies and equipment emerge in the field of LED electronic screen steel structure installation.For example, the advent of large tonnage cranes, computer synchronous control of the overall lifting and sliding technology for the structure of the installation of a new chapter.In particular, large LED electronic screen steel frame structure project, in the field conditions and structure form allow, should vigorously promote the application of new technology, new technology;Try to reduce the amount of work in the upper air and improve the installation efficiency of steel frame structure.