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介绍了国内首座三塔悬索桥人字形钢中塔的构造设计,对塔底锚固受力特点做了介绍,对钢塔底部钢与混凝土的连接设计中的几个问题进行了分析,并提出了相应的解决办法,主要包括如何处理塔底纵向分叉后,由轴力引起的水平分力的问题;对铰接与固接两种锚固方式进行了分析,介绍了塔底固结、预应力螺杆锚固的方案;通过塔底注浆的方法,实现了在双向倾斜的塔座表面,保证塔底钢板与混凝土表面的密实连接;分析了塔底柱脚加劲肋的受力特性;加劲肋焊缝设计及加劲高度的确定方法;在锚固材料选择及预压力的有效传递方面,改进了双套管的施工方案,变更为螺杆与混凝土承台无黏结的锚固方案,既减少了钢套管施工,又保证了预压力的有效传递。
This paper introduces the structural design of the first Chinese three-tower suspension bridge herringbone steel tower, introduces the characteristics of the anchorage force at the bottom of the tower, analyzes some problems in the design of the connection between steel and concrete at the bottom of the steel tower, Including how to deal with the problem of the horizontal force caused by the axial force after the vertical fork of the tower bottom. The two kinds of anchoring modes of the hinge and the solid are analyzed. The methods of tower bottom consolidation, prestressed screw anchoring The method of grouting at the bottom of the tower realizes the tight connection between the bottom steel plate and the concrete surface on the two-way inclined tower seat surface, analyzes the stress characteristics of the stiffener at the bottom of the tower, And the method of determining the stiffened height. In the selection of anchorage materials and the effective transmission of pre-pressure, the construction scheme of double casing is improved and the anchoring scheme without bonding of screw and concrete cap is reduced, which reduces the construction of steel casing and Ensure the effective delivery of pre-pressure.