Study On The Construction Technology Of Panjiayuan Subway Station Of Tenth Route In Beijing

With the development of economy and society, ground traffic congestion situation is becoming more and more serious in our country. The subway is a more effective solution to solve the city traffic congestion at present. It has the advantages of fast speed, high efficiency, and little influence on ground transportation and so on. Now more and more cities begin to build subway. The construction of subway is directly affected by the choice of the station construction method. Therefore, it has important significance to study on construction technology of subway station.Taking the cover-excavation method construction of Panjiayuan subway station of tenth route in Beijing for the engineering background, firstly, the research status of subway construction method were reviewed at home and abroad. Secondly, dewatering and drainage construction technology, cover-excavation technology and waterproofing structure construction technology of station construction were introduced. Finally, the monitoring technology of the whole construction process was analyzed.Through the investigation surrounding the station environment, tube well precipitation scheme was adopted to the main body of the station, and open drainage scheme was adopted to other parts. The station is three spans and three storeys structure, north-south layout. The CCTDM was used to build the main body of the station. The cover-excavation method was used in the north of the station and the open cut method was used in accessory structures. The detail technical measures were given to due the key and difficult problems of main structure, cut and cover column and main retaining structure of the station. The waterproof system of the excavation structure used by station was studied. Through the collation and analysis of the monitoring data, the safety stability of foundation pit and surrounding buildings was analyzed. Monitoring data include horizontal displacement and settlement of retaining structure, deformation and settlement of temporary column, inclination and settlement of adjacent building, underground water level, important pipelines underground and axial force etc. By analyzing the law of the monitoring data and timely adjustment of the construction technology, the construction can be ensured the smooth progress.The construction technology of cover-excavation method was discussed in this paper and it can provide some reference for the construction of subway in the future.