Pile foundation composite rail bearing beam structure in double-line excavation 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 arrangement lines and discloses a medium-low speed maglev traffic engineering double-line excavation section pile foundation combined type rail bearing beam structure. The medium-low speed maglev traffic engineering double-line excavation section pile foundation combined type rail bearing beam structure comprises a plurality of first pile foundation bearing structures, a pile foundation support beam combined bearing structure, two rows of reinforced concrete rail bearing beam base plates, two rows of reinforced concrete beam type structures and rail bearing beam two-side backfill filler. The top end of each first pile foundation bearing structure is connected with the corresponding reinforced concrete rail bearing beam base plate in a bearing mode. The top ends of the reinforced concrete rail bearing beam base plates are connected with the reinforced concrete beam type structures in a bearing mode. A drainage ditch is arranged beside the rail bearing beam two-side backfill filler and is provided with a drainage slope. According to the medium-low speed maglev traffic engineering double-line excavation section pile foundation combined type rail bearing beam structure, the requirements of a medium-low speed maglev traffic engineering rail structure for deformation of the rail bearing beam structure and high post-construction settlement can be met, the requirements of long-term stability, durability and construction quality controllability of a foundation bed can also be met, and the economy is better.

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-track excavation 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 ope...

AI Technical Summary

Problems solved by technology

[0005] (1) The existing low-lying track-bearing beam structure is set on the subgrade 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 for post-construction settlement of the subgrade and foundation, and the geological conditions in the area where the line passes are generally complex and changeable, and it is difficult to control the construction quality of the conventional rail-bearing beam structure

[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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