Due to the inconsistency of architectural modeling and structural form, the construction site conditions vary greatly. It can be said that no construction method or scheme is suitable for the installation of any steel structure project, so each installation method has its own supporting conditions.

　　The commonly used installation methods of grid structure are: high-altitude bulk method, strip and block installation method, structure slip method, support frame slip method, integral hoisting method, integral lifting method, etc.

　　Considering according to the process method: understand the characteristics of structure form, structure weight, installation height, span, etc., and choose mature and advanced installation technology as far as possible in combination with the actual situation of the site.

　　According to the consideration of lifting equipment: firstly select self-owned equipment, make full use of on-site lifting equipment, and secondly rent it nearby. General situation: when the number of components is small, truck cranes are often used; gantry frame hoisting is mostly small and medium-sized truck cranes; when the installation period is longer, the installation height and the gyration radius are large, crawler cranes are more economical than truck cranes; overall Lifting and sliding mostly use hydraulic synchronous lifting (incrementing) devices; middle and high-rise steel structure installations generally use tower cranes; ordinary bridge installations mostly use gantry cranes and bridge erecting machines.

　　Inverted installation method-Inverted installation method is a special installation process of up and down. It is suitable for structures with large height-to-width ratios, such as steel towers, masts and other structures. When it is difficult for conventional cranes to approach the hoisting, the upside-down method is generally used. When using this method, it is necessary to focus on the overall stability of the structure and the stability of the equipment during the installation process, and reliable support and stability measures must be taken. Structure slip method-The structure slip method has been developed to adopt hydraulic pusher and computer synchronous control technology, which is one step more advanced than the past grid slip method.

Its applicable conditions are: *, due to site conditions, no crane and support frame can be installed in the span; second, the structural support conditions are conducive to laying sliding tracks; third, the strength and rigidity of the sliding unit structure determined by calculation All meet the requirements; fourth, understand the form of structural support and fixing methods; fifth, the longer the longitudinal slip path, the higher the efficiency. Support frame sliding method-its applicable conditions are the occupation of the inner space, the lower installation height, the larger structural area or the longer longitudinal length. *When the installation height is less than 15 meters, you can choose ordinary fastener-type steel pipe scaffolding or bowl-type scaffolding as the support frame; second, for the higher frame body and the bearing capacity, the steel support frame should be selected. No matter which scheme is adopted, in addition to the requirements of the code, the horizontal dynamic load must be considered in the design calculation, and large diagonal braces should be added when necessary to improve its overall stability.

　　 Overall lifting method-The overall lifting method currently mostly 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 schemes. The equipment is portable and the technology is advanced. Its applicable conditions are: *, occupying the space within the span; second, the installation height is higher; third, the components are heavier; fourth, it is limited to vertical hoisting and cannot be moved horizontally. That is, the higher the installation height, the heavier the lifting weight and the better the effect.