Composite Framing Rail Beam Structure of Pile Foundation in Medium and Low Speed ​​Maglev Double Line Fill Section

Abstract

The invention belongs to the technical field of low lines of medium-low speed maglev transportation engineering, and discloses a pile foundation composite framing type rail bearing beam structure for a medium-low speed maglev double-line filling section. The pile foundation composite framing type rail bearing beam structure for medium-low speed maglev double-line filling section comprises a plurality of first pile foundation bearing structures, a pile foundation supporting beam composite bearing structure, two rows of reinforced concrete rail bearing beam bottom plates, two rows of reinforced concrete beam type structures, a roadbed filler below a rail bearing beam, and backfill materials on the two sides of the rail bearing beam; the top end of each reinforced concrete rail bearing beam bottom plate is connected with the reinforced concrete beam type structure; the backfill materials on the two sides of the rail bearing beam are connected with the roadbed filler below the rail bearing beam. According to the pile foundation composite framing type rail bearing beam structure for the medium-low speed maglev double-line filling section, the defect of a rail bearing beam structure of the conventional low line can be reduced; the long-term stability is higher; high requirements of a rail structure of the medium-low speed maglev transportation engineering on deformation and post-construction settlement of the rail bearing beam structure can be met; the requirements for long-term stability, durability and construction quality controllability of a foundation bed can also be met; moreover, the economic property is higher.

Description

Technical field [0001] The invention belongs to the technical field of low-position lines of medium and low-speed maglev traffic engineering, and more specifically, relates to the structure type of rail-bearing beams in the middle and low-speed maglev double-track fill section. Background technique [0002] The low-to-medium-speed maglev rail transit is a new type of transportation. There are few research results at home and abroad, and there are only a few lines in operation all over the world. At present, there are only the mid-to-low-speed maglev railway commercial operation line-Eastern Hill Line that was constructed and opened in Japan in March 2005 and the mid-low-speed maglev railway commercial operation line opened in June 2014 in South Korea. However, China’s low- and medium-speed maglev transportation currently only has the National University of Defense Technology test line, the Qingchengshan test line, and the Tangshan test line, but there are no official lines that a...

AI Technical Summary

Problems solved by technology

[0005] (1) The existing low-lying line rail-bearing beam structure is set on the embankment geotechnical structure, which is compacted by filler filling, the compaction quality is not easy to control, and it is prone to deformation in the later stage, which affects the overall structure Rigidity, and post-construction settlement is difficult to control

[0006] (2) The rail bearing beam structure of the low-lying line has high requirements on the post-construction settlement of the subgrade and foundation, and the geological conditions in the area where the line passes are generally complex and changeable, so the foundation needs to be reinforced at the same time, and the subgrade filling After grading, the area of ​​foundation reinforcement increases, resulting in high cost and long construction period; and the foundation treatment is a concealed project, which is reinforced by conventional soft soil foundation reinforcement measures, and the construction quality is not easy to control

[0007] (3) The geotechnical structure of the low-lying line due to the filling and compaction of the filler is vulnerable, and the construction quality is not easy to control, and it is relatively easy to produce uneven settlement, which causes the longitudinal and lateral stability of the subgrade under the rail beam to deteriorate , so that the overall stability of the rail beam structure is impaired

[0008] The rail-bearing beam of the low-mounted magnetic levitation line has higher requirements for post-construction settlement, long-term stability and durability of the subgrade bed. When the line is located in the ground reinforcement area, the construction period is long and the construction quality is difficult to control if the traditional rail-bearing beam structure is adopted. , Poor overall structural stability and poor economy

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