|
|
|
| Application of Rounded Ring and Beam-trussed Bracing System in Excavation of Large Foundation Pit |
| TANG Hu1，HU Hai-qing2，XU Xiang-hui1，SUN Jun-ling 1 |
| 1. The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251，China; 2. Tianjin Communication Architecture Design Institute, Tianjin 300201，China |
|
|
|
Abstract Research purposes: Construction of the underground luggage warehouse in Beijing Xi Station is an important part of reconstruction of Beijing Xi Station, which has significance to the process of the reconstruction, so it is necessary to seek a bracing system with rational structure for rapid reconstruction through doing researches.
Research methods: The rational type of bracing system should be selected according to the geologic conditions, surrounding environmental requirements, project functions and local commonly-used construction technique and facilities as well as technical and economic conditions. The comparison and analysis of the computing results obtained by limiting equilibrium method and elastic fulcrum method are made with logic unit computing , logic united computing and SAP84 computing.
Research results: The bracing system of artificial pile exterior-protecting structure-rounded ring-beam-trussed support is adopted with rational bearing system to the structure , easy construction and rationalization in economy.
Research conclusions: The bracing system of rounded ring beam and trussed beam has the feature of rational bearing to structure and is suitable for supporting the foundation pit with large plane size，quasi-long and wide sizes , quasi-surrounding-stratum nature and quasi-resisting force. The concrete circular ring structure has the feature of rational bearing with good entire stability and the truss system has the feature of good unity. The construction can be conducted rapidly with steel component and the limiting equilibrium computing can be adopted to single exterior-protection structure.
|
|
Received: 19 November 2007
|
|
|
|
|
|
[1 ] JGJ 120—99，建筑基坑支护技术规程[S].
[ 2 ] GB 50010—2002 ,混凝土结构设计规范[S].
[ 3 ] GB 50017—2003 ,钢结构设计规范[S].
[4]夏明耀.地下工程设计施工手册[M].北京:中国建筑工 业出版社，1999.
[5]龚晓南.深基坑工程设计施工手册[M].北京:中国建筑 工业出版社，1998.
[6]刘建航.基坑工程手册[M].北京:中国建筑工业出版 社，1997.
|
|
|
|
2007, Vol. 24 
