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减小轨道、桥梁受力,防止轨道因爬行而积聚纵向力,是城市轨道交通中小半径大坡道高架桥地段无缝线路设计的技术关键。以南京地铁南北线一期工程中半径R=350 m曲线地段的安德门和东井亭高架桥以及33‰大坡道地段无缝线路为例,研究实现优化设计的关键技术。利用在道岔的岔道与曲线头之间的直线段,增设一组单向钢轨伸缩调节器,避免道岔承受无缝线路的纵向力,同时也减小高架桥的墩台受力。对于小半径线路,调整锁定轨温,用最大温度拉力取代断轨力,用温度力的侧向分力和列车通过桥梁时的离心力叠加检算墩台受力。对于大坡道地段,采用控制爬行量或钢轨应力,确保运营安全。
Reducing the stress of the track and the bridge and preventing the track from accumulating longitudinal force due to crawling are the key technical points in the design of the CWR design for large and medium-sized large viaduct viaducts in urban rail transit. The key technologies of optimal design are studied in the case of the Andemen and Dongjingting Viaduct with a radius of R = 350m in the first phase of the Nanjing-North-South Line project and the seamless road with a 33 ‰ large ramp. The use of a straight line between the turnout and the curve head of the turnout adds a set of unidirectional rail expansion and contraction adjusters to prevent the turnout from receiving the longitudinal force of the seamless line and reduce the stress on the abutment of the viaduct. For a small radius of the line, adjust the locking rail temperature, with the maximum temperature pull instead of breaking force, the lateral component of the temperature force and the centrifugal force superimposed when the train through the bridge to check the abutment force. For large ramps, the use of controlled creep or rail stress, to ensure operational safety.