美国底特律门道桥设计与施工关键技术

发布时间：2018-11-15 22:00

【摘要】：底特律门道桥为上、下行分离的双幅立交桥,采用提篮拱结构,横向联结系为橄榄球状,桥面系建筑高度仅为1.524m。该桥内、外拱肋(无铰箱形拱、不等长)相互内倾,内拱肋拱脚位于I-94公路水平面,外拱肋拱脚位于电报路水平面;桥面系由2根外加劲纵梁、4根内小纵梁及14根横梁组成,纵、横梁采用螺栓刚性连接;该桥采用双吊杆,单根吊杆在满负荷活载作用下仍具有承载桥面系的能力;3根系梁埋于电报路路面以下,承受拱的水平推力;基础采用纵、横向系梁和斜桩基础体系。拱肋分3段预制,施工时由临时塔架支承,采用螺栓现场拼接。搭建临时高强度螺栓EFCO钢支柱支撑桥面横梁,通过液压千斤顶精确调整横梁位置。分4个阶段进行桥面系施工,外加劲梁均与桥台固结。吊杆承受荷载后,进行混凝土桥面板浇筑。
[Abstract]:Detroit Gate Road Bridge for the upward and downward separation of the double overpass, using a basket arch structure, horizontal connection for rugby, the bridge deck system building height is only 1.524m. In the bridge, the outer arch ribs (non-hinged box arch, unequal length) each other, the internal arch rib arch foot is located in I-94 highway horizontal plane, the outer arch rib arch foot is located in the Telegraph road horizontal plane; The bridge deck system is composed of 2 stiffened longitudinal beams, 4 inner small longitudinal beams and 14 cross beams, and the longitudinal and transverse beams are bolted rigidly, the bridge adopts double suspenders, and a single suspender still has the ability to carry the deck system under the full load of live load. (3) the root beam is buried below the road surface of the Telegraph Road, bearing the horizontal thrust of the arch, and the foundation adopts the system of longitudinal, transverse tie beam and inclined pile foundation. The arch rib is prefabricated in 3 sections, supported by temporary tower during construction, and bolts are used. Build temporary high-strength bolt EFCO steel support bridge deck beam, through hydraulic Jack accurate adjustment of beam position. The bridge deck system is constructed in four stages, and the stiffened beams are all consolidated with abutment. After the suspenders bear the load, the concrete deck slab is poured.
【作者单位】：福州大学土木工程学院;
【基金】：超高性能混凝土制备与工程应用基础研究(U1305245)
【分类号】：U448.22;U442.5

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