大型输水钢管下穿兰新客运专线方案研究

Study on the Scheme of Large-scale Water Pipe Passing Through Lanzhou-Xinjiang Passenger Dedicated Line

兰州市水源地建设工程彭家坪支线输水隧洞下穿兰新客运专线马耳山沟中桥,该工程须考虑桥下净空、管道桥线型、结构布置等问题。为了使管道桥下穿既有马耳山沟中桥既满足小半径反向曲线线型要求,又满足既有桥下净空和行洪要求,通过方案比选最终选择了对既有铁路运营影响最小的槽型连续弯梁方案,解决了上述关键技术难题。技术方案顺利通过审查并实施,可为类似工程提供借鉴。

Pengjiaping branch water conveyance tunnel of Lanzhou water source construction project passes through the existing railway of Ma’ershan bridge of Lanzhou-Xinjiang passenger dedicated line. According to the specific conditions of the site,the clearance under the bridge,the pipeline bridge line type and structure layout shall be considered in the design. The pipeline bridge passes through the existing Ma’ershan middle bridge shall meet the requirements of small radius reverse curve,but also satisfy the requirements of the clearance and flood discharge. Through the detailed scheme comparison,a continuous curved trough girder is selected with the least impact on the railway operation. In this way,the above key technical problems are solved. The scheme has been reviewed and applied. It may provide guideline for similar engineering project passing throuth the existing railway.