临河黄河大桥主桥设计关键技术

Key Design Techniques for Main Bridge of Linhe Huanghe River Bridge

临河黄河大桥处在严寒、高烈度场地条件下的地区,经研究确定该桥主桥采用一联(59.7+11×100+59.7) m的超长联大跨连续梁桥,桥宽12 m,梁体为单箱单室变截面箱梁,墩身为实体墩,主墩基础为钻孔灌注桩基础。设计过程中形成了超长联大跨连续梁桥减隔震设计、合龙工艺等成套关键技术:桥墩上设置大吨位双曲面球型摩擦摆隔震支座和柱面摩擦摆隔震支座,基桩上采用永久性抗震钢护筒,利用零弯矩理论指导合龙工序设计等。该套技术解决了超长联大跨连续梁桥抗震、长联施工等关键技术问题,减少了工程投资。

Given that the bridge site is located in a freezing cold region where the seismic inten -sity is high ,the main bridge of Linhe Huanghe River Bridge is projected to be a （59 .7 ＋ 11 × 100 ＋59 .7） m long-span continuous girder bridge featuring very long continuous units .The bridge is 12 m wide and the girder adopts the single cell single box girder with variable cross section .The piers are solid piers and the foundations of the main piers adopt the bored pile foundations .During the design process ,complete sets of key techniques have been developed ,including the seismic isola-tion design and closing techniques for long-span continuous girder bridge with very long continuous units .The details incorporate installing large tonnage hyperbolic spherical sliding pendulum isola -tion bearings and the cylindrical friction pendulum isolation bearings ,adopting permanent anti-seismic steel casings for the foundation piles and using zero bending moment theory to guide the closure procedure design .The adoption of these techniques resolve the key technical problems of how to allow the long-span continuous girder bridge with very long units to show sound seismic performance and how to conduct construction for long units ,and cut down the costs of the project .