Composite rail-bearing beam structure of pile foundation in double-line filling section of medium and low-speed maglev traffic project

Abstract

The invention belongs to the technical field of medium-low maglev transport engineering low circuits and discloses a combined rail-bearing beam structure for a double-line filling section pile foundation in medium-low maglev transport engineering. The combined rail-bearing beam structure comprises multiple first pile foundation bearing structures, a pile foundation supporting beam combined bearing structure, a reinforced concrete rail-bearing beam bottom plate, two rows of reinforced concrete beam structures, a roadbed filler under a rail-bearing beam and backfilling fillers on the two sides of the rail-bearing beam. The top end of the reinforced concrete rail-bearing beam bottom plate is connected with the reinforced concrete beam structures in a bearing mode; the backfilling fillers on the two sides of the rail-bearing beam are connected through the roadbed filler under the rail-bearing beam in a bearing mode. The combined rail-bearing beam structure can overcome the defect of a traditional low-circuit rail-bearing beam structure, is better in long-term stability, can meet the high requirements of the medium-low maglev transport engineering rail structure for rail-bearing beam structure deformation and post-construction settlement and the controllable requirements for long-term stability, durability and construction quality of a foundation bed, and is higher in economical efficiency.

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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