基于风洞礎及预算定额研究的大练岛高墩支架变更设计

Modification Design of Dalian Island High Pier Support Based on Wind Tunnel Test and Budget Quota Research

福平项目大练岛桥桥址区属于典型的海洋性季风气候,受海峡上“穿堂风”增强效应的影响,形成一个“风谷”通道,风速进一步加强集中,导致风速大、频次高、现场腐蚀严重,导致施工条件恶劣,安全和质量风险较高。原设计预算中按照内陆常规定额组价,而且采用万能杆件搭拆定额,但后续发现费用组成与设计图纸不符合,而且严重偏低。通过对现浇支架进行缩尺模型风洞试验研究发现,原设计无法满足现场安全、进度等相关要求,项目部与设计院及业主多次沟通,最终业主同意变更,同时项目部与设计院沟通,抽换了原预算的万能杆件定额,变为钢结构定额,为项目赢得了最大效益。

The Dalian Island Bridge site of Fuping project is a typical marine monsoon climate;which is affected by the enhanced effect of"cross-strait wind",especially in Dalian Island,which is affected by the topography,forming a"wind Valley"channel,and the wind speed is further strengthened^resulting in high wind speed and high frequency.And the site corrosion is serious,resulting in poor construction conditions,high safety and quality risks.In the original design budget:the price was set according to the inland conventional quota;and the universal rod erection and dismantling quota was adopted,so the cost composition was not consistent with the design drawings,and it was seriously low.On the other hand,the project and the University jointly carried out the scale model wind tunnel test on the cast-in-place support.Through the fixed model balance force measurement boundary layer wind tunnel test,the original design could not meet the site safety,progress and other related requirements The project department communicated with the design institute and the owner for many times,and finally the owner agreed to the change.At the same time,the project department communicated with the design institute through the special volume.After the change,in the cost group price,the original budget universal member quota was changed into the steel structure quota,which won the maximum benefit for the project.