Effects Of Construction Sequence Of Overpass And Metro Station Under The Condition Of Total Station On Movements And Internal Forces Of Station

With the development of urban traffic and the needs of times development, the technology of station-bridge combined was derived. Now and even later will be more and more widely used. However, the theoretical research of this technology is obviously lagged behind the engineering practice. And the research framework of the relevant system theory has not yet established. Therefore, this paper according to the characteristics of this technology. Exploring what the effects of construction sequence of overpass and metro station under the condition of total station on movements and internal forces of station. Main work and research results in this work are as follows:This paper puts forward that a technology innovation what bridge pile foundation used as metro station frame column. And according to the different station bridge construction sequence is divided into the "Station-bridge-combined" and "Bridge-stati on-combined". The combination can not only reduce the amount of demolition, to avoid the two demolition of municipal pipelines, but also shorten the total construction period and save investment. in addition, The overpass and the metro station can not affect the external landscape through the common column.The three dimensional elastoplastic simulation was conducted on “Station-bridge-combined” and “Bridge-station-combined”. A comparative analysis is carried out from the pier deformation of upper cross line bridge 、the deformation and stress characteristics of subway station floor and the mechanical response of the floor beam and station frame column. Pointed out that the construction sequence of overpass and metro station under the condition of total station on movements and internal forces of station. On the basis of these, the construction scheme of the "Station-bridge-combined" is listed as a typical example. The research and implementation of the key technology in the engineering construction process are analyzed in detail. The results show that: structural system of “Station-bridge-combined” under the condition of total station is feasible. And the construction sequence of the overpass and the subway station has great influence on the deformation and stress of the station structure.Detailed analyses were conducted on Zhongyixueyuan Station of Chengdu Metro. For example, including the choose of the station-bridge combined methods、the synergy of bridge pile foundation、the coordination of the design specifications、the selection of beam-column joints of the cover cut steel tubular columns and the protective measures for the surrounding buildings of the engineering. With the help of the finite element analysis software, the stress of the serviceability limit state of the steel tube column ring beam joint in the actual stress situation is analyzed. The results show that the feasibility of“Station-bridge-combined”by using the innovation technology of overpass and metro station;The steel structures of the beam column joints in the cover dig steel pipe column had not yet entered the yield state. Meanwhile the concrete is in a stable state. And the beam column nodes are able to meet the worst load combinations of the bearing capacity requirements. From the field test data in the projects, we found that all the surrounding buildings are in a security state, and thus we confirmed that the effectiveness of the protection measures of the neighboring structures is effective...