Pile Foundation Composite Framed Rail Beam Transition Section Structure in Medium and Low Speed ​​Maglev Double Line Excavation Section

Abstract

The present invention belongs to the technical field of lower lines of medium-low speed maglev traffic engineering, and discloses a transitionary structure of a pile foundation composite separated bearing-trail beam of a medium-low speed maglev double-line excavated section. The transitionary structure comprises first pile foundation bearing structures, pile foundation-underpinning beam composite bearing structures, two rows of reinforced concrete bearing-trail beam bed plates, two rows of reinforced concrete beam structures, backfill fillers at two sides of the bearing-trail beam, a bridge abutment, and an end wall. A plurality of first pile foundation bearing structures are arranged; top ends of the reinforced concrete bearing-trail beam bed plates are connected to the reinforced concrete beam structures; drainage ditches are disposed beside the backfill fillers at the two sides of the bearing-trail beam, and drainage slopes are disposed at one sides, far away from the backfill fillers at the two sides of the bearing-trail beam, of the drainage ditches. The transitionary structure of a pile foundation composite separated bearing-trail beam of a medium-low speed maglev double-line excavated section is better in long-term stability, and meets the high requirements of structural distortion and post-construction settlement of the bearing-trail beam and also the requirements of the long-term stability and durability of a foundation bed and the controllability of construction quality; and with the structure, smooth transition between a maglev elevated structure and a low-line transitionary F track is effectively achieved.

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 transition section of a pile-supporting-rail beam in an excavation section of a medium-low-speed maglev double-track excavation section. 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...

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Problems solved by technology

In the low-lying line section, the foundation under the rail-bearing beam is a geotechnical structure composed of rock and soil. Affected by factors such as terrain and geological conditions, the quality is relatively difficult to control. It is prone to uneven settlement under the action of load and various natural environmental factors. It is inevitable that post-construction settlement inconsistent with the bridge abutment of the elevated structure will occur, resulting in poor post-construction settlement. The settlement difference between the low-lying line and the bridge abutment position will inevitably affect the smoothness of the F track, and may even cause the F track to be misplaced. , deformation and other problems, in severe cases, will affect the normal operation of maglev vehicles

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