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| Research on the Twice Vertical Swivel Technology by the Negative Point of View of the Needle Steel Tower
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| TANG Yong, SONG Xiao-san |
| China Railway Major Bridge Engineering Co. Ltd, Wuhan, Hubei 430050,China |
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Abstract Abstract：Research purposes：By using the twice vertical swivel technology by the negative point of view and computer network control synchronization technology of raising and lowering developed vertical swivel construction to needle steel tower of cable-stayed bridge in Shanghai Yunzaobang. This paper sums up the experience to explore the application promotional value of this new technology in the bridge engineering construction of the leaning tower steel structure assembly.
Research conclusions：By comparison with the different method of the steel tower construction technology to select the optimal solution, it is concluded that: (1) It adopts the hydraulically synchronous technique to hoist the negative point of view of the needle steel tower which centered on the steel tower angular point, to swing the steel towel in place with 75°,then synchronous lowering it to the theoretical position. The technology is advanced and reliable, the scheme is reasonable and feasible. (2) The technical innovation on the twice vertical swivel technology by the negative point of view of the needle steel tower is successfully used in Shanghai Yunzaobang cable-stayed bridge，it can guarantee the rapid, efficient, safe and high quality, which can save about three months period and effectively lower the cost. (3) It can be used in the steel structure assembled construction fields of the high and thin inclined tower.
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