(1)The social economy has driven the development of the construction industry and related industries. When carrying out large-scale subway construction, the form of subway depot + superstructure is generally used to ensure the daily operation and maintenance of the subway. In these subway depots, The use of steel space frame structures is also becoming more and more common.
(2)The space frame of the subway depot is 62m long, 34m wide, 1.8m high from east to west, and 1.998m high from north to south.
Generally speaking, the main installation methods for the construction of the space frame roof of the subway depot are as follows: The first method is the high-altitude bulk method, which belongs to the high-altitude assembly. In short, through the use of small assembly units, Complete the roof assembly at a high altitude. Before assembling, it is necessary to complete the construction of the local construction platform to ensure that the shape of the space frame system does not change, and finally can be assembled by the cantilever method. Lattice columns should be added to the assembled platform based on fastener-type steel pipes. Second, the slicing and block installation method, the principle of which is to divide the spatial space frame into multiple areas, is beneficial to reduce the difficulty of installation. Third, the overall hoisting. First, complete the assembly of the space frame on the ground, and then use professional equipment for hoisting. Fourth, the overall improvement method. Relying on the support column, use the lifting equipment to lift the space frame that has been spliced.
Among them, the space frame rod is the key support member, and a special sliding scaffold must be built during construction, and the assembly of the overhead space frame components can be further completed on a professional work platform. The steel grating roof structure is relatively high in the structure of the garage in the subway section and can play a certain role in stability and support. In the process of installing steel grating, it is necessary to be able to understand the force of the space frame structure and the related characteristics of the structure in time. At the same time, a comprehensive analysis is made from a comprehensive perspective, so as to formulate the conditions and technical application basis for the construction of the subway depot and use the overall hoisting method, the high-altitude sliding method, and the strip installation method.
In the construction of this project, the overall installation method is adopted. First, the space frame is assembled on the ground into a whole, and the whole is lifted to the design position by lifting equipment to be fixed. The advantage of this method is that it does not require tall assembling brackets, and the amount of high-altitude work is less, which can effectively ensure the welding quality, but the shortcomings are also obvious.