Design And Research Of New Bridge Girder Erection Machine

Following with the requirement of the overall speed-raising for Chinese existing railways and heavy-load capacity and high speed for the new-built railways, the existing bridge erecting machines with low tonnage can not satisfy the erection of railway track. In order to accommodate the erection of railway simply-supported T beam bridge which is applicable to both wagons and passenger cars at 200km/h, it is pressing to design and develop a new type of railway bridge erecting machine. This paper research the new bridge erecting machine based on the requirement of the erecting machine by the development of the China railway and this research have practical significance and engineering value.Combination with the development trend of existing bridge erecting machine in abroad and home, and based on the existing machine in China, the new bridge erecting machine inherit the design and project of DJK140 and DJK160 bridge erecting machine, the original proposal were overall strengthen and local improved and optimized in order to satisfying the work condition. The major improvement and optimization include: expand the whole size of the vehicle; the new speed increased bogie with cross sustaining device and constant contact side bearing was used to improve the running quality of the vehicle; the structure of the center plate and coupler seat was optimized in order to improve the maintainability; the all-steel welded frame structure was used in the vehicle body and the other parts was strengthen in order to satisfy the requirement of the strength and stiffness; the driving force was strengthen by develop the power transmission system in order to suit the work condition in long descending gradient; the center sill was not used in host and auxiliary machine and the table board was equipped in order to make the installation and maintenance of generator set and air compressor convenient. The new bridge erecting machine applies to laying and erecting heavy-load bridges with weight<=170T and length <=32m, 2201, 2101 and 9753 girders, general bridges and track panes. Great improvement has been made in the aspects such as transportation condition, safety factor, transmission mode and operation performance, with the main technical properties and parameters upgraded. The brake distance of host machine and auxiliary machine which run in 80km/h was calculated, and the brake distance are 328.3m and 260m, requires the technology policy which prescribe the brake distance must be less than 800m.The static strength of carbody, bolster and frame of new bridge erecting machine was calculated by the software ANSYS, the results show that the outrigger part and local structure of vehicle chassis can't satisfies the require of the standard. So some structure of the origin design was proved. Static strength is made on the body after trial production of prototype machine and the results all satisfies the requirement of the standards.The dynamic performance of the new bridge erecting machine was calculated and the result shows that the stability and sperling satisfies the requirement of the standards. Dynamic performance is made after trial production of prototype machine and the results all satisfies the requirement of the standards.