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1、深水桩基施工工法(YJGF)一、前言深水中修建桥梁等其他建筑物时,为了确保施工安全,使基础施工方便易行,减少施工干扰,降低工程成本,可采取钢管桩水中平台方案施工水中钻孔桩的施工。。二、工法特点1、施工过程中陆地之间的联系非常方便,顺利地解决了水中运输问题,并且安全可靠。2、平台搭设方法简单,并且施工过程中处处有平台,即使毫无水上生活经验,工人也可顺利施工而不会造成晕船现象。三、适用范围1、水深在30米范围的深水基础施工,2、跨越水库、河流、海湾的铁路公路桥梁深水基础。四、施工工艺(一)工艺原理将浮箱、工字钢、桁架、卷扬机、卷扬机带动的旋转底座和起重机大臂等拼装组成浮吊,利用浮吊将浮箱
2、和工字钢组成的导向船为导向框架,使用浮吊依靠导向船打设钢管桩,搭设水中平台,以水中作业平台为依托,下设钢护筒、钻孔、下放钢筋笼、灌注混凝土。(二)工艺流程(见图一)(三)施工方法要点1、钢管桩及钢护筒的制作钢管桩所用的钢管和钻孔的水中部分所用的钢护筒,均现场卷制。一般选用10~14mm厚的钢板,卷成小节后,将小节焊接成大节。每节钢管之间采用内外周圈焊接,焊缝宽度不小于2cm。2、浮箱拼装浮箱是浮吊的基础,由若干个小钢箱组成。小钢箱外型为长方体底部周边为圆角,顶部为长方形,钢箱钢板厚度3mm,内部有钢制中隔板,顶部焊有带螺栓眼和卡销眼的角钢及钢板,小钢箱之间通过螺栓和卡销来互相连接,顶
3、部预留有锚栓孔,以连接固定锚机或其他需要固定的设备。深水桩基施工工艺流程图(图一)修建临时码头andmasonryonthecorneroffice,inprinciple.Staggered,two-storeybrickverticalseamson25mm.Halfabrickusedseparately.(3)infrontofthewall,firstinstallcounting,countingpolesmarkthebrickthicknessofmortarjointthickness,doorandwindowelements,suchasdeepposition
4、,countingpolesstandonthecorner.Statelevelwhencopyingflat,floorelevationsinleatherbardesignelevationposition.(4)whenbricksfirstalignment,masonrybricksaccordingtoguidelines.Apartfromhalfabrickwall,anddouble,tobettercontrolthewallflatness.(5)whenbuilt,the"31"masonrymethod,thatis,"anashshovel,brick
5、,kneadandknead"methodofoperation.Verticalrollmethodisused.Verticalseamsofthemortarasfullaspossible,ventilationarenotallowed.Brickwallsofhorizontalmortarjointthicknessandverticalmortarjointwidthcontrolinthe8~12mmrange.Horizontalmortarjointmortarfullsizemustbegreaterthan80%.(6)fromcornerorpositio
6、ningatbegan,bothinsideandoutsidewallwhilemasonry,aspectwallstaggeredtakereceived;outsidewallcorneratisstrictlyprohibitedleftstraightrub,shouldbefromtwoaaspectswhilemasonry;wallbodytemporarycontinuousatshouldmasonryintoobliqueCha,obliqueChalengthnotshouldislessthanheightof2/3(Generalbyastepscaff
7、oldingheightcontrol);asleftobliqueChahasdifficult,exceptwallcorneratandtheseismicfortificationarea,wallbodytemporarycontinuousatnotshouldleftstraightChaoutside,canfromwallsurfaceout200mmmasonryintoyinandYangCha,andalongwallhigheac