安庆长江铁路大桥桥塔墩钻孔桩施工关键技术
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摘要
安庆长江铁路大桥主桥为(101.5+188.5+580+217.5+159.5+116)m双塔三索面钢桁梁斜拉桥,3号、4号桥塔墩均采用37根3.4(3.0)m变直径钻孔摩擦桩基础,桩长分别达108m、110m。3号、4号桥塔墩基础均采用双壁钢围堰施工方案,通过人工创建稳定地层施工环境,利用KTY4000型钻机完成清水法钻孔,钻孔到位后利用钻机进行第1次清孔,采用JJC-1D超声波成孔检测仪定量检孔,检测合格后移开钻机,下放钢筋笼和导管,利用导管进行第2次清孔,再灌注桩身水下混凝土,完成桩基施工。该桥桥塔墩桩基施工过程中未发生任何掉钻及断桩事故,经超声波无损检测均为Ⅰ类桩。
The main bridge of Anqing Changjiang River Railway Bridge is a steel truss girder cable-stayed bridge with double pylons,triple cable planes and with span arrangement(101.5+188.5+580+217.5+159.5+116)m.The pylon piers No.3 and No.4 of the bridge are all supported on the foundations that are respectively made up of 37 nos.of the3.4(3.0)m variable diameter frictional bored piles with the length of the piles being up to 108m and 110m.The foundations for the pylon piers were constructed by the double-wall steel cofferdam scheme.By way of the artificial effort,the construction environment of the stable stratum was created,the bored holes of the clear water method were completed,using the KTY4000 boring machine.After the holes were bored to the designed elevation,the holes were cleared off for the first time by the boring machine and the holes were then quantitatively inspected,using the JJC-1DBored Hole Ultrasonic Inspection Instrument.Further after the holes were proved to be qualified through the inspection,the boring machine was removed away,the reinforcement cages and tremie ducts were lowered into the holes and the holes were cleared off for the second time through the ducts.Finally the tremie concrete for the piles was cast to complete the construction of the pile foundations.In the construction of the piles,no accidents like the falling of the boring bits and breaking of the piles took place and the piles were all qualified as Class I piles according to the inspection.
The main bridge of Anqing Changjiang River Railway Bridge is a steel truss girder cable-stayed bridge with double pylons,triple cable planes and with span arrangement(101.5+188.5+580+217.5+159.5+116)m.The pylon piers No.3 and No.4 of the bridge are all supported on the foundations that are respectively made up of 37 nos.of the3.4(3.0)m variable diameter frictional bored piles with the length of the piles being up to 108m and 110m.The foundations for the pylon piers were constructed by the double-wall steel cofferdam scheme.By way of the artificial effort,the construction environment of the stable stratum was created,the bored holes of the clear water method were completed,using the KTY4000 boring machine.After the holes were bored to the designed elevation,the holes were cleared off for the first time by the boring machine and the holes were then quantitatively inspected,using the JJC-1DBored Hole Ultrasonic Inspection Instrument.Further after the holes were proved to be qualified through the inspection,the boring machine was removed away,the reinforcement cages and tremie ducts were lowered into the holes and the holes were cleared off for the second time through the ducts.Finally the tremie concrete for the piles was cast to complete the construction of the pile foundations.In the construction of the piles,no accidents like the falling of the boring bits and breaking of the piles took place and the piles were all qualified as Class I piles according to the inspection.
引文
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[2]农代培,季跃华,徐炳法.安庆长江铁路大桥主墩大型深水基础施工方案与关键技术[J].桥梁建设,2012,42(6):1-7.(NONG Dai-pei,JI Yue-hua,XU Bing-fa.Construction Scheme and Key Construction Techniques for Large Deepwater Foundations of Main Piers of Anqing Changjiang River Railway Bridge[J].Bridge Construction,2012,42(6):1-7.in Chinese)
[3]刘爱林,农代培.安庆长江铁路大桥3号墩围堰锚碇系统设计与施工[J].桥梁建设,2011,(6):1-5,41.(LIU Ai-lin,NONG Dai-pei.Design and Construction of Mooring System for Cofferdam of Pylon Pier No.3of Anqing Changjiang River Railway Bridge[J].Bridge Construction,2011,(6):1-5,41.in Chinese)
[4]于祥君.南京大胜关长江大桥7号墩钻孔桩成孔技术[J].桥梁建设,2009,(2):5-8.(YU Xiang-jun.Boring Technique for Bored Piles of Main Bridge Pier No.7 of Dashengguan Changjiang River Brigde in Nanjing[J].Bridge Construction,2009,(2):5-8.in Chinese)
[5]吴长才.武汉天兴洲长江大桥3号主塔墩3.40m大直径深孔钻孔设备选型[J].铁路工程造价管理,2008,23(1):26-30.(WU Chang-cai.Type Selection of3.40mLarge Diameter and Deep Hole Drilling Equipment for Main Tower Pier No.3 of Wuhan Tianxingzhou Yangtze River Bridge[J].Railway Engineering Cost Management,2008,23(1):26-30.in Chinese)
[6]梅瑞泰.复杂地质深水长大钻孔桩施工关键技术[J].铁道标准设计,2009,(5):32-35.(MEI Rui-tai.Key Technology for Construction of Long and Large Bored Piles in Deep Water in Complicated Geological Area[J].Railway Standard Design,2009,(5):32-35.in Chinese)
[7]黄旺明,皮军云.安庆长江铁路大桥3号桥塔墩钢护筒群施工技术[J].桥梁建设,2011,(5):6-10.(HUANG Wang-ming,PI Jun-yun.Construction Techniques for Steel Casing Groups of Pylon Pier No.3of Anqing Changjiang River Railway Bridge[J].Bridge Construction,2011,(5):6-10.in Chinese)
[8]刘爱林.宁安铁路安庆长江大桥主塔墩深水基础施工技术[J].铁道标准设计,2012,(2):73-77.(LIU Ai-lin.Construction Technology for Deep Water Foundation of Main Pylon Pier of Anqing Yangtze River Bridge on Nangjing-Anqing Railway[J].Railway Standard Design,2012,(2):73-77.in Chinese)
[9]赵顺涛,潘军.南京大胜关长江大桥6号主墩超大型钢套箱围堰下沉控制技术[J].世界桥梁,2008,(3):22-24,35.(ZHAO Shun-tao,PAN Jun.Construction Techniques for Sinking Control of Very Huge Steel Boxed Cofferdam for Main Pier No.6of Dashengguan Changjiang River Bridge in Nanjing[J].World Bridges,2008,(3):22-24,35.in Chinese)
[10]宋伟俊,文武松,连泽平,等.南京大胜关长江大桥主墩深水基础施工技术[J].桥梁建设,2008,(4):15-19.(SONG Wei-jun,WEN Wu-song,LIAN Ze-ping,et al.Construction Techniques for Deep Water Foundations of Main Piers of Dashengguan Changjiang River Bridge in Nanjing[J].Bridge Construction,2008,(4):15-19.in Chinese)
目录
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