WO2003038189A1

WO2003038189A1 - A method of manufacturing the track girder of the magnetic suspension railway

Info

Publication number: WO2003038189A1
Application number: PCT/CN2002/000462
Authority: WO
Inventors: Xiangming Wu
Original assignee: Shanghai Maglev Transportation Development Co., Ltd
Priority date: 2001-11-01
Filing date: 2002-07-01
Publication date: 2003-05-08
Also published as: CN1343812A; CN1127593C; HK1045342A1; HK1045342B

Abstract

A method of manufacturing of the track girder of the magnetic suspension railway, by linking up several single span or multispan girders. Firstly the girders are prefabricated, installed, orientated according to the method of the simply supported beam. Then the girders are linked up. After linking, the continuity points approximate to the continued double span or multispan girders in the vertical plane, but approximate to the hinged double span or multispan girders in the side direction of the horizontal plane.

Description

Method for manufacturing track beam of magnetic levitation and railroad

The present invention relates to a method for manufacturing a track beam, in particular to a method for manufacturing a track beam for a magnetic levitation and railroad railway, and belongs to the field of rails in the field of transportation. technical background

Since modern high-speed rail transportation systems such as magnetic levitation trains run at high speeds, the system has exceptionally high accuracy requirements for the line structure. It is required that the deformation and deflection of the line be controlled within a small range under the action of temperature differences and moving loads. The deflection or overarching of the beam caused by temperature difference or moving load is not a problem in traditional bridges. For modern high-speed traffic rail vehicles, especially in magnetic levitation tracks, these temperature difference or moving load The small deformation caused will affect the high-speed operation of the train. Under the action of temperature difference, the support reaction force of the middle pier of the continuous track beam, whether vertical or horizontal, is generally much greater than that of the simply supported beam. From the structural characteristics of the elevated foundation, its resistance to vertical reaction forces is better, and the increase in vertical reaction forces is not sensitive to the increase in the cost of the lower foundation. The ability of such foundations to resist horizontal forces is often poor, and each time a small increase in the horizontal reaction force caused by the upper structure causes a large increase in the material of the lower foundation. This is especially true for soft ground. After a literature search of the subject matter of the present invention, a German patent application was found with the application number: DE19936756A1, and the name is: Running track of a rail vehicle. The patent application technology also involves connecting several segments of simply supported beams into a continuous beam. The method is self-explanatory: In high-speed traffic, especially in high-speed traffic on magnetic levitation tracks, the running track of a rail vehicle is distributed on a reinforced concrete multi-span beam. The multi-span beam is designed with a support and is supported on a support pier, which supports either end of a span. The beams referred to here, especially the empty box beams, have a bridge-shaped structure on the side. The beams are provided with anchors, which run vertically and are curved, similar to a sine curve. The highest point of the element is within the range of the support, and its lowest point is basically in the middle of each span of the beam, so each span of the beam has a certain curvature to compensate its own weight. Although this technology also uses a subsequent continuous method to connect several segments of track beams into continuous beams, it connects several simply supported beams into fully continuous beams in both vertical and horizontal directions, that is, into a truly continuous beam. Beam. Therefore, such a structural form cannot overcome two major shortcomings and deficiencies: 1. The horizontal force reaction force of the middle pier of the continuous beam is too large; 2. The foundation cost of the substructure is high. Summary of the invention and specific implementation method

Aiming at the defects and deficiencies of the background technology, the present invention contemplates a new manufacturing method that reduces manufacturing and construction costs and has a more reasonable structural force. This method is suitable for the traveling track of a rail vehicle, and is particularly suitable for a maglev railway. Tracks, track beams can be reinforced concrete structures or steel structures, which are connected by several single-span or multi-span beams. The connection method is: prefabricated, simply transported, installed, positioned according to simply supported beams, and then connected. The connected continuous points are close to continuous two-span or multi-span continuous beams in the direction of the vertical plane, but are still close to hinged two-span or multi-span simply supported beams in the horizontal plane.

The following further describes the technical solution of the invention: Each section of the track beam between each support pier is prefabricated, processed, transported, installed, accurately positioned in the form of a simply supported beam, and then every two or more spans In the vertical plane, that is, the bending rigidity is connected as much as possible around the horizontal axis, close to the structural form of the continuous beam, and in the horizontal direction, that is, about the vertical axis, the bending stiffness is designed to be as small as possible, close to the hinged two. Span or multispan simply supported beam.

Through calculations and experiments, we can know that the continuous beam has superior structural performance compared with two simply supported beams of equal section in terms of controlling deformation caused by temperature difference or live load, but due to the continuous beam structure of the track beam Generally, it is constructed by prefabrication and erection. Due to its huge size and weight, and because the multi-span continuous beam belongs to an external statically indeterminate structure with multi-point support, it must always maintain the state of multi-point support during transportation and lifting. In addition, the relative displacement of any fulcrum must be controlled within a small range to ensure the safety of the track beam itself. Otherwise, the entire beam will be easily damaged during the construction process. Therefore, during the construction of the line, not only high-grade beam-dedicated roads must be built in parallel along the line, but also special beam-supported trolleys for multi-point support and special lifting equipment for simultaneous lifting at multiple points, for manufacturing, processing, transportation, Installation and positioning bring great difficulties and greatly increase the cost of production and construction. The use of continuous beams has the advantage of less deformation under the influence of temperature differences and live loads. At the same time, it overcomes the shortcomings of bulky and awkward continuous beams in prefabrication, processing, transportation and installation. A new track spanning all the advantages of a simply supported beam while overcoming their respective disadvantages structure type.

The invention has substantial characteristics and significant progress, solves the disadvantages of large volume and awkwardness of continuous beams in prefabrication, processing, transportation and installation, and has a low foundation cost. The implementation of the present invention has a level of creativity that overcomes problems that the background technology cannot solve for a long time, and has strong practical value.

Claims

Claim

1. A method for manufacturing a track beam of a magnetic levitation and railroad railway, which is characterized by connecting a plurality of single-span or multi-span beams, and the connection method is: prefabricated processing, transportation, installation, positioning according to simply supported beams, Then, the connected continuous points are close to continuous two-span or multi-span continuous beams in the vertical plane, but are still close to hinged two-span or multi-span simply supported beams in the horizontal plane.

2. The method for manufacturing a track beam of such a magnetic levitation and railroad according to claim 1, characterized in that each section of the track beam between each buttress is prefabricated and processed in the form of a simply supported beam in advance. , Transportation, installation, precise positioning, and then every two or more spans are connected in the vertical plane, that is, around the horizontal axis direction to make the bending stiffness as large as possible, close to the structural form of continuous beams, and in the horizontal direction, that is, around the vertical In the axial direction, the bending stiffness is designed to be as small as possible, close to the hinged two-span or multi-span simply supported beam.