摘要
基于精细化设计水下盾构隧道管道支座的目的,以西气东输三线中卫黄河盾构穿越为例,通过采用CAESAR_Ⅱ软件对整个穿越段管道进行应力和位移分析,最终指导管道支座的设计。中卫黄河盾构隧道穿越处设计压力为12 MPa,管径为1 219 mm。盾构隧道两岸竖井中心之间水平投影长度为450 m,隧道内预留西四线管道。盾构内管道安装分为竖井内管道安装和平巷内管道安装,竖井内管道作为穿越段整体管道进行补偿计算。平巷内输气管道均安装在已浇筑好的钢筋混凝土管道支座上,西三线和西四线并排敷设,管道中心距为2.08 m,支座沿管道轴向间距每15 m一组,与管道之间铺10 mm厚绝缘橡胶板,并用管卡固定管道,防止管道运营时侧移和上浮。盾构隧道竖井中心两侧25 m外各设置固定墩1个,西三线和西四线管道合用1个固定墩。经软件计算得出支座管箍与管道之间的间隙距离,模拟了管道的位移情况,从而使管道支座设计更加精细化。
In this paper, the Yellow River shield crossing project of Third West-to-East Gas Pipeline in Zhongwei was taken as the example to realize the target of precise design on the pipeline support in underwater shield tunnel. The stress and displacement of the pipeline in the whole crossing section was analyzed by using CAESAR_II software, to provide the guidance for pipeline support design. At the crossing section of Yellow River shield tunnel in Zhongwei, the design pressure is 12 MPa and the pipe diameter is 1 219 mm. The horizontal projection between the shaft centers on both sides of the shield tunnel is 450 m long. The space for the Fourth West-To-East Gas Pipeline is reserved in this shield tunnel. The pipeline in the shield is installed in the patterns of vertical shaft installation and tunnel lane installation. The pipeline in the vertical shaft is taken as the whole pipeline of crossing section for compensation calculation. In the tunnel lane, all gas pipelines are installed on the available reinforced concrete support. The Third and the Fourth West-to-East Gas Pipelines are laid in parallel with the center distance of 2.08 m. The spacing between supports is 15 m along the axial direction of the pipe. Insulating rubber plate of 10 mm thick is set between the pipe and the support. The pipeline is fastened with pipe clamp to prevent the pipeline from moving and floating. One anchor block is set respectively on either side of the shaft, 25 m away from its center. The Third and the Fourth West-to-East Gas Pipelines share one anchor block. The spacing between the support pipe clamp and the pipe is calculated by software and the displacement of the pipeline is simulated, so that the pipeline support is designed more precisely.
出处
《油气储运》
CAS
北大核心
2017年第7期838-842,共5页
Oil & Gas Storage and Transportation
基金
中国石油天然气集团公司工程建设分公司课题"非常规盾构隧道穿越设计施工关键技术研究"
专科15-2-A
