摘要
斜拉桥主梁挂篮施工通常有前支点和后锚点两种施工方法,文章以某中央索面大跨径斜拉桥施工期间出现的实际问题为研究点:前支点挂篮施工变更为后锚点施工,施工方案变更后,为保证结构的安全,避免主梁0#块顶板会产生较大的拉力,采用在0#块布置钢管支撑和调整优化预应力钢束数量与类型两种保护措施,借用桥梁专用软件Midas/Civil进行建模和计算分析,结果表明:以上两种方法均能有效降低0#块顶板拉力,保证了结构的安全,考虑到施工便利,认为设置钢管桩更符合施工要求。
There are usually two construction methods for main girder travelling basket construction of cable-stayed bridge:front fulcrum and back anchor. This paper takes the actual problems that occurred during the construction of a long-span cablestayed bridge with a central cable plane as the research point. The construction of the front fulcrum traveling basket was changed to the construction of the rear anchor. After the construction scheme was changed,two protective measures,such as arranging steel pipe supports in Block 0 and adjusting the number and type of prestressed steel bundles,were used to ensure the safety of the structure and avoid the large tension of the roof plate of the main girder Block 0. Modeling and calculation analysis were carried out by using bridge software Midas/Civil. The results show that the above two methods can effectively reduce the roof tension of Block 0 and ensure the safety of the structure. Considering the convenience of construction,it is considered that the installation of steel pipe piles is more in line with the construction requirements.
出处
《内蒙古公路与运输》
2019年第2期6-9,50,共5页
Highways & Transportation in Inner Mongolia
关键词
斜拉桥
前支点挂篮
后锚点挂篮
应力
cabe stayed bridge
suspended scaffolding with front support
suspended scaffolding with rear pivots
stress
