格形钢板桩结构振动沉桩锤型选择与应用
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摘要
为解决格形钢板桩结构振动沉桩选锤问题,分析了格形钢板桩结构特点及振动下沉阻力,总结了现有钢板桩振沉动侧阻力计算方法,编制锤型选择计算程序。港珠澳大桥香港人工岛工程格形钢板桩分项工程的案例表明,国外格形钢板桩振沉经验方法可以满足工程要求。格形钢板桩结构振沉时不可避免会发生挠曲变形,造成钢板桩锁口之间产生摩阻力,锁口阻力会大幅提高沉桩难度以至于决定钢板桩振沉不到设计高程。因此选锤时除要保证一定的富裕系数以外,需采取必要的工艺措施控制钢板桩的倾斜变形,尽可能降低锁口之间的摩阻力,从而保证钢板桩能顺利振沉至设计高程。
To make vibratory hammer selection for cellular steel sheet pile structure, the pile's structure feature and sink resistance are analyzed,and existing dynamic skin resistance calculation methods for steel sheet pile are summarized. The cellular steel sheet pile sub-project of Hong-Kong-Zhuhai-Macao Bridge artificial island shows that,the vibration subsidence empirical method of cellular steel sheet pile structure abroad can meet the engineering requirements.Deflection deformation will occur inevitably when the cellular steel sheet pile is sinking.As a result,friction is generated between lock mouths of piles and the difficulty of the pile vibration sinking to the design elevation will greatly increase. Therefore, in addition to ensuring a certain rich coefficient, necessary construction measures must be adopted to control the affection of pile incline and deformation, to decrease the friction resistance and ensure the pile's sinking to the design elevation.
To make vibratory hammer selection for cellular steel sheet pile structure, the pile's structure feature and sink resistance are analyzed,and existing dynamic skin resistance calculation methods for steel sheet pile are summarized. The cellular steel sheet pile sub-project of Hong-Kong-Zhuhai-Macao Bridge artificial island shows that,the vibration subsidence empirical method of cellular steel sheet pile structure abroad can meet the engineering requirements.Deflection deformation will occur inevitably when the cellular steel sheet pile is sinking.As a result,friction is generated between lock mouths of piles and the difficulty of the pile vibration sinking to the design elevation will greatly increase. Therefore, in addition to ensuring a certain rich coefficient, necessary construction measures must be adopted to control the affection of pile incline and deformation, to decrease the friction resistance and ensure the pile's sinking to the design elevation.
引文
[1]王举睿.格形钢板桩结构三维有限元数值分析[D].天津:天津大学,2012.
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[2]毛铠.格形钢板桩结构设计施工手册[M].北京:中国计划出版社,1996:1-4.
[3]石綿知治.プレハブ鋼矢板せル工法[M].东京:鹿島出版会,1978.
[4]中交第三航务工程勘察设计院有限公司.港口工程桩基规范:JTS 167-4-2012[S].北京:人民交通出版社,2012.
[5]水谷裕.钢管桩振动下沉计算[R].神户:日本建设机械调查株式会社,1966.
[6]法国PTC公司.PTC振动沉桩介绍与说明[R].上海:艾西伊建筑设备贸易有限公司,2002.
[7]美国ICE公司.ICE振动桩基[R].上海:PTC中国公司,2002.
[8]Geotechnical Engineering Office,Civil Engineering and Development Department.Foundation design and construction[M].Hong Kong:GEO Publication,2006.
[9]BUSTAMANTEM,GIANESELLI L.Pile bearing capacity prediction by means of static penetrometer CPT[C]//Proceedings of Second European Symposium on Penetration Testing.Amsterdam:Balkema,1982:493-500.