帕德玛大桥铁路连接线无砟轨道系统设计

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Abstract Research purposes: Padma Bridge Rail Link Project is the first railway in Bangladesh to lay ballastless track. It is also the first time for Chinese engineers and technicians to carry out the design of ballastless track on long-span steel truss girder and ballastless turnout on simply supported beam under the condition of 120 km/h speed and 25 t axle load mixed passenger and freight railway. The design faces a series of challenges such as limitations of both clearance space and track weight, 2 350 mm ultra-wide beam seam and 7.5‰ ultra-large beam-end rotation angle, and the layout of seamless turnout groups with ballastless track on simply supported beams. So it is urgent to carry out systematic research on track structure and components to guide track construction.
Research conclusions: (1)A single-layer long sleeper embedded ballastless track with integrated design of base plate and bridge deck is proposed to solve the problem of clearance space and track weight limitation on large span steel truss bridge.(2)An integrated device of bridge movement joint and rail expansion joint is developed with design expension of ±800 mm to solve the problem of adaptive adjustment for track structure under the condition of 2 350 mm wide beam seam and 7.5‰ beam-end rotation angle.(3)Based on the "turnout-beam-pier" integrated calculation model, the interaction analysis between turnout and bridge is carried out to solve the design problem of seamless turnout groups with ballastless track on simply supported beams under 25 t axle load.(4)The above innovative practice has guided construction of the first ballastless track in Bangladesh, which has a certain reference value for the design of ballastless track on complex bridge structures in overseas projects.

Key words： long-span steel truss bridge ballastless track bridge movement joint rail expansion joint seamless turnout

Received: 11 October 2023

PACS:

U213.2

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	YANG Wenmao
	LIN Hongsong
	XU Hao
	DAI Feng

Cite this article:

YANG Wenmao,LIN Hongsong,XU Hao, et al. Design of Ballastless Track System for Padma Bridge Rail Link[J]. Journal of Railway Engineering Society, 2023, 40(12): 36-40.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I12/36

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