Pile foundation joist type rail bearing beam structure in double-line filling section of medium and low speed maglev traffic project

Abstract

The invention belongs to the technical field of medium-low speed maglev traffic engineering low-set lines and discloses a medium-low speed maglev traffic engineering double-line filling section pile foundation support beam type rail bearing beam structure. The rail bearing beam structure comprises multiple pile foundation bearing structures, a reinforced concrete support beam, reinforced concrete rail bearing beam base plates, two rows of reinforced concrete beam type structures, lower roadbed filler of a rail bearing beam and two-side backfill filler of the rail bearing beam, wherein the reinforced concrete beam type structures are connected to the top ends of the reinforced concrete rail bearing beam base plates in a supported mode, and the two-side backfill filler of the rail bearing beam is supported by the lower roadbed filler of the rail bearing beam. The rail bearing beam structure can overcome the defects of traditional low-set line rail bearing beam structures and is higher in long-term stability, the high requirement of a medium-low speed maglev traffic engineering track structure for rail bearing beam structural deformation and post-construction settlement is met, the requirement for long-term stability, durability and construction quality controllability of a foundation bed is met, and economical property is higher.

Description

technical field [0001] The invention belongs to the technical field of low-set lines of medium and low-speed maglev traffic engineering, and more specifically relates to a structure type of a rail-supporting beam in a double-line filling section of a medium-low speed maglev traffic engineering. Background technique [0002] Medium and low-speed maglev rail transit is a new type of transportation. There are few research results at home and abroad, and there are even fewer lines in operation around the world. At present, there are only the commercial operation line of the medium and low speed maglev railway in Japan in March 2005-Eastern Hills Line and the commercial operation line of the medium and low speed maglev railway in South Korea in June 2014. At present, China's medium and low-speed maglev transportation 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 in operati...

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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