匝道爆破开挖中保护埋地管线的贝雷梁应用研究
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摘要
以泸州市沱江四桥及连接线工程为背景,介绍并分析了爆破开挖时利用贝雷桁架结构保护管线的措施。首先在静力条件下,利用解析法和数值模拟方法对结构进行安全检算;其次,运用ANSYS/LS-DYNA模拟爆破开挖,将得到的振动加速度施加到结构上并进行动力响应分析,得到贝雷梁最大变形19.9 mm,最大压应力90.5 MPa,最大拉应力36.1 MPa,满足变形及强度要求;最后,运用ANSYS分析结构的动力特性。结果表明:结构的自振频率远小于爆破振动频率,且在水平面上垂直顺梁的方向结构最易变形。
Based on Tuojiang Bridge 4, Luzhou City and the connection line engineering, the measures using Bailey truss for pipeline protection in blasting excavation were introduced and analyzed. Firstly, the structure safety was checked under the static condition by analytical method and numerical simulation method. Secondly, in the blasting excavation imitated by ANSYS/LS-DYNA, the vibration acceleration obtained was applied on the structure and, with the dynamic response analyzed, it was solved that the maximum deformation of the Bailey beam was 19.9 mm, the maximum compression stress 90.5 MPa, and the maximum tensile stress 36.1 MPa, meeting the requirement of deformation and strength. Finally, the structure dynamic characteristics was analyzed with ANSYS. The result shows that the natural vibration frequency of the structure is far less than the blasting vibration frequency, and the structure is mostly pronet odeformation in the direction perpendicular to the beam on a horizontal plane.
Based on Tuojiang Bridge 4, Luzhou City and the connection line engineering, the measures using Bailey truss for pipeline protection in blasting excavation were introduced and analyzed. Firstly, the structure safety was checked under the static condition by analytical method and numerical simulation method. Secondly, in the blasting excavation imitated by ANSYS/LS-DYNA, the vibration acceleration obtained was applied on the structure and, with the dynamic response analyzed, it was solved that the maximum deformation of the Bailey beam was 19.9 mm, the maximum compression stress 90.5 MPa, and the maximum tensile stress 36.1 MPa, meeting the requirement of deformation and strength. Finally, the structure dynamic characteristics was analyzed with ANSYS. The result shows that the natural vibration frequency of the structure is far less than the blasting vibration frequency, and the structure is mostly pronet odeformation in the direction perpendicular to the beam on a horizontal plane.
引文
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[2] 张成仕.市政施工过程中的地下管线保护措施[J].科技与企业,2011(7):62.ZHANG C S.Protection measures on underground pipeline of municipal construction[J].Science-Technology Enterprise,2011(7):62.
[3] 陈水龙.浅谈市政工程勘察钻探中对城市地下管线的保护[J].安徽建筑,2012(6):116-117.CHEN S L.On protection of city underground pipeline in municipal engineering exploration drilling[J].Anhui Architecture,2012(6):116-117.
[4] 黄从刚.城市地下工程施工中对重要管线保护技术[J].隧道建设,2007,27(2):68-71.HUANG C G.Protection of underground utilities during construction of urban underground works[J].Tunnel Construction,2007,27(2):68-71.
[5] 苏无疾.某地铁车站高压电缆悬吊保护技术[J].山西建筑,2011,37(20):153-154.SU W J.The suspend protection technology for high voltage cable in a subway station[J].Shanxi Architecture,2011,37(20):153-154.
[6] 丁彩良,阎仁才.长江码头改造桩帽悬吊法施工技术[J].现代交通技术,2009,6(3):102-105.DING C L,YANR C.Suspension construction technology of Yangtze River wharf pile-cap transformation[J].Modern Transportation Technology,2009,6(3):102-105.
[7] 李连生.地铁车站贝雷梁悬吊雨水管施工方案设计[J].石家庄铁路职业技术学院学报,2016,15(4):39-44.LI L S.Construction scheme design of storm sewer suspended by bailey beam in subway station[J].Journal of Shijiazhuang Institute of Railway Technology,2016,15(4):39-44.
[8] 白旭军.贝雷桁架在地铁施工管线保护中的应用[J].科技情报开发与经济,2010,20(17):197-199.BAI X J.The application of bailey truss in pipelines protection in subway construction[J].Sci-Tech Information Development & Economy,2010,20(17):197-199.
[9] 赵云.贝雷桁架在地下既有管线保护中的应用研究[J].江西建材,2016(23):76,78.ZHAO Y.The study of bailey truss in underground pipelines protection[J].Jiangxi Building Materials,2016(23):76,78.
[10] 程强.贝雷梁手算与有限元计算的差异性[J].建筑知识,2016(8):179-181.CHENG Q.Bailey beam by hand and the differences of finite element calculation[J].Architectural Knowledge,2016(8):179-181.
[11] 黄绍金,刘陌生.装配式公路钢桥多用途使用手册[K].北京:人民交通出版社,2002.
[12] 楼晓明,郑俊杰,马建军,等.隧道爆破振动速度研究[J].有色金属(矿山部分),2007,59(3):31-34.LOU X M,ZHENG J J,MA J J,et al.Study on blasting vibration velocity in tunnel[J].Nonferrous Metals (Mining Section),2007,59(3):31-34.
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