对既有线提速改造的思考

研究目的：本次研究的目的是使既有线提速设计更加完善，决策更加正确，减少设计与施工中不必要的失误。 研究方法：综合多条既有线提速改造勘测设计，配合施工中的经验、教训、体会，参考国外高速铁路的资料及国内试验成果，提出既有线提速改造中值得借鉴的成功经验和需要吸取的教训。 研究结论：（1）正线数目的选择及最小曲线半径的确定，直接牵涉到项目的投资大小和经济效益；（2）提速改造时，封闭客货运量较小的车站可节省运营成本；（3）对既有桥梁可通过动载试验确定是否予以加固利用；（4）根据国外高速铁路的线间距及胶济线列车交会试验表明：我国规范规定的线间距相对较为保守；（5）线路拨距时，对桥墩台采用绑宽技术，可避免既有桥拆除改建及过渡工程。

Thoughts on Innovation of Existing Railway Line for Speed-raise

Research purposes: The purposes are to make the design better,decision-making more correct and reduce unnecessary errors in design and innovation of existing railway for speed-raise.Research methods:It is put forward what successful experiences and necessary lessons should be drawn from the survey,design and coordinating construction of existing railway for speed-raise through studying the information of foreign countries and the tested results of China.Research conclusions:(1) The scale of investment and economic benefits depend on the quantity of main track and the minimum radius of curve.(2) Closing some stations of less passenger and freight traffic volumes during the innovation may save much operation cost.(3) Through doing dynamic load test,it can be decided whether the existing bridges needs reinforcement or not.(4) The midway between tracks of foreign countries and the test of trains meeting on Qingdao-Jinan Railway Line show the midway between tracks in China is relatively conservative.(5) Application of bandage technique for pier stand can avoid removal or reconstruction of existing bridge,or conducting transition engineering.