Study On Structure Of Large Diameter Prestressing Allied Circular Inverted Siphon

The Project of Middle Ling for Transferring Water from South to North (PMTSN) is 1267 Km long. The water source is in Dan Jiangkou reservoir which is on the Hanjiang River that subsidized to Yangtze River. The route ends at Peking and Tianjin , through province of Hubei,Henan and Hebei. The across structures on this line suggested are slots,culverts and inverted-siphons according to the geology and geography etc.And inverted-siphons are in larger proportion. There are 14 inverted-siphons only in Hebei section. Though the amount is numerous, but the structure pattern is unique, they all adopt a box cross section; other structure patterns can not get an application because of the design theories and the technique difficulty. In order to the improve the inverted-siphons work stress conditions, this text is main to do an initial research to the circular structure .but the single pipe research is already more mature, and the allied circular prestressed structure is a blank, to meet the designed water discharge ability etc. function, this topic's structure to that form carries on a research.The main research process combines the inverted-siphons on Liyang River to carry on. Liyang inverted-siphons is one of the larger cross structure on PMTSN in south of the Hebei province. And it is built about the 1.0 Kms to the west of Neiqiu County in Hebei province; it is the joint place of the east hand and the north hand of Liyang River. This text mainly put forward allied circular prestressed structure .Because there is no mature calculation formula for the intricate structure, or reference for theories analysis about this, so we study by numerical simulation. Then get possibility conclusion first; Then carry on a detailed research to the recommended plan, make sure the correct size like thickness of the wall of the structure,distance between each two pipes,the base thickness,decoration of steel wring etc. This study can provide an excellent design scheme; it also filled up to inverted-siphon structural blank on the other hand. It provides a reference for the latter work.