宁波新典桥主桥设计

Design of Main Bridge of Xindian Bridge in Ningbo

宁波新典桥以“甬”为设计立意:主拱的线条寓意“甬山”,行人步道的线条寓意“甬水”两者组合一个整体,形成一个“甬动山水”整体意向。创造性地采用带有悬挑慢行系统的下承式系杆拱桥,跨径213 m(桥长221.6 m),拱轴线采用1.7次抛物线,拱肋采用六边箱型截面,拱肋上设置两组风撑,每组三道。系梁采用单箱单室断面,与正交异性桥面系采用焊接连接。悬挑慢行系统布置在主梁两侧,主要包括三个部分:副拱(装饰拱)、挑臂系统、挑臂人行道系统。主梁端部设置牛腿支撑引桥。拱上梁上锚固均采用吊耳构造,吊杆采用抗拉强度1 860 MPa的填充型环氧涂层钢绞线。主墩下采用钻孔灌注桩(摩擦桩)。

The design concept of Xindian Bridge in Ningbo is "Yong". The lines of the main arch signify "Yong Mountain", and the lines of the pedestrian walkway signify "Yong River". The two are combined into a whole to form an integrated intention of "Moving Mountain and River". The through bowstring arch bridge with a cantilever slow-moving system is innovatively adopted. Its span 213 m and the bridge length is 221.6 m. The arch axis is 1.7 times parabola. The arch rib adopts a six-sided box section. Two groups of wind braces are arranged on the arch ribs, each group of three. The tie beam adopts a single-box single-chamber section, and is welded with the orthotropic bridge deck. The cantilever slow-moving system is arranged on both sides of the main girder, mainly including three parts of auxiliary arch(decorative arch), cantilever system and cantilever sidewalk system. The corbels are set up at the end of the main girder to support the approach bridge. The lifting lug structure is adopted for the anchorage on the upper beam of the arch. The epoxy-coated steel strand filled with the tensile strength of 1 860 MPa is adopted for the boom. The cast-in-situ piles(friction piles) are used under the main pier.