摘要
Abstract
The paper studied how to erect the non-standard 29. 15 m box girder of the Yuji super major bridge on Beijing-Shanghai high-speed railway. The JQ900b-type girder-erecting machine, which had been originally for standard box girder of high-speed railway, was put into use, partly with a purpose of researching how to use this girder-erecting machine in non-standard box girder. Meanwhile, in view of this bridge’s characteristics of being sited at the Yellow River alluvium with 12. 5 m high piers, a series of effective construction technologies were used for the temporary supporting: adding the temporary pile foundation, enlarging the size of bearing platform, designing two sets of 4-limb steel tube lattice columns. At the same time, the simulation test on the stretching and loading of the precision rolling screw thread steel was conducted for testing the temporary supporting. There was a difficult problem in construction:according to the design alteration document, the erecting method for the non-standard 29. 15-m box girder must be altered from the cast-in-situ plus support-frame method into the prefabrication method. However as a result, this difficult problem in construction has been able to be solved by using above-mentioned construction technologies.关键词
高速铁路/预应力混凝土/箱形梁/架桥机Key words
high-speed railway/prestressed concrete/box girder/girder-erecting machine分类
交通工程
