某斜拉桥挂索施工方案

目录一、概述····················································································································1二、总体施工工艺········································································································2三、主要施工方法········································································································51、施工准备·········································································································52、斜拉索的制作、运输、检查验收及存放··································································93、斜拉索提升至桥面·····························································································94、斜拉索的塔端挂设···························································································105、桥面放索·······································································································116、斜拉索梁端安装······························································································117、塔端软牵引····································································································138、塔端张拉·······································································································169、斜索力调整····································································································1710、斜拉索施工注意事项·······················································································18四、主要材料、机械、设备计划（全桥）········································································19五、劳动力使用计划···································································································20六、斜拉索施工进度计划·····························································································20七、斜拉索相关参数···································································································21八、质量保证措施······································································································25九、安全保证措施······································································································26****大桥斜拉索张挂施工方案***********工程公司-1-一、概述广东省***大桥为独塔双索面斜拉桥，桥跨布置为180+101+45m，索塔采用由直塔柱和斜拉柱组成，无上横梁的异型索塔，主梁采用预应力混凝土∏形梁，双向预应力混凝土结构，并采用前支点挂篮悬臂浇筑主梁混凝土。斜拉索两端均采用张拉端锚具，张拉端设在塔上；斜拉索中心线处的梁高为2.3m，斜拉索按扇形布置，塔上竖向间距1.8m,梁上水平间距6.0M，采用平行钢丝斜拉索。主桥标准横断面布置为：1.5m（人行道）+2.0m（非机动车道）+2.25m（斜拉索布索区）+0.5m（防撞栏杆）+23.0m（机动车道）+0.5m（防撞栏杆）+2.25m（斜拉索布索区）+2.0m（非机动车道）+1.5m（人行道），总宽35.5m。主桥斜拉索共设4×27＝108根，斜拉索为塑包平行钢丝束，钢丝采用φ7镀锌高强钢丝，钢丝排列整齐，同心绞合，外缠包带，在缠包带外挤包高密度聚乙烯护套两层（黑色和彩色）。斜拉索两端均为带螺纹的冷铸锚。斜拉索共分为PES7-127、PES7-151、PES7-7、PES7-199、PES7-223、PES7-253六种规格，最长索A27长190.923m、重12.8682t，斜拉索钢丝总重756.1539t。平行钢丝斜拉索构造见图1。全桥斜拉索布置情况见图2。张拉端锚具防护套管斜拉索T2T1DhLk张拉端锚具T2T1DhL图1平行钢丝斜拉索构造示意图图2全桥斜拉索布置情况****大桥斜拉索张挂施工方案***********工程公司-2-二、总体施工工艺斜拉索张挂施工主要包括运输、索上桥面、展索、挂设、张拉、索力检测、调整及减振装置安装等工序。根据斜拉索的重量、锚固牵引力的大小以及张拉施工空间要求，1~10#、11~27#索分别采用不同的方法进行施工。各类索的总体施工方法分别为：①1~10#索直接采用塔吊提升上桥面置于卧式放索盘上，利用塔吊完成塔端挂设及桥面展开，采用桥面卷扬机直接牵引梁端锚头入索套管锚固，最后在塔端进行斜拉索的张拉及索力调整。②11~27#索采用桥面吊索桁车提升上桥面置于卧式放索盘上，利用塔顶起吊门架完成塔端挂设，桥面卷扬机牵引拉索桥面展开，然后采用塔端软牵引，梁端桥面卷扬机牵引完成斜拉索梁端锚固，最后在塔端进行斜拉索的张拉及索力调整。1~10#索总体施工流程见图3，11~27#索总体施工流程见图4。不合格塔顶卷扬机、塔吊完成塔端挂设塔端临时固定安装张拉设备张拉设备准备、标定挂篮前移桥面卷扬机放索上压锚夹板、穿滑车钢丝绳挂篮前支点调滑块塔吊吊索盘至桥面现场检查、验收、堆存塔吊提升塔端锚头将拉索放出一定长度安装起吊头、夹具索厂运索至工地放索船就位退货斜拉索的制造、运输****大桥斜拉索张挂施工方案***********工程公司-3-图31~10#索总体施工流程图斜拉索塔端第三次张拉至设计值并锚固索力、主梁标高检测索力调整减震器安装斜拉索第一次张拉主梁待浇梁段钢筋绑扎、模板支立主梁浇筑砼一半斜拉索第二次张拉主梁砼浇筑完毕砼养生、强度达90%，主梁预应力施工斜拉索梁端挂篮与混凝土梁体系转换检查上插头方向使其与索方向一致卷扬机牵引压锚，带头插销****大桥斜拉索张挂施工方案***********工程公司-4-塔顶卷扬机、塔顶门架完成塔端挂设塔端临时固定安装软牵引装置张拉设备准备、标定挂篮前移软牵引下放塔端锚头至一定高度上压锚夹板、穿滑车钢丝绳挂篮前支点调滑块吊索桁车吊索盘至桥面现场检查、验收、堆存塔吊提升塔端锚头将拉索放出一定长度安装起吊头、夹具索厂运索至工地放索船就位退货斜拉索的制造、运输桥面卷扬机放索斜拉索第一次张拉主梁待浇梁段钢筋绑扎、模板支立主梁浇筑砼一半斜拉索第二次张拉检查上插头方向使其与索方向一致卷扬机牵引压锚，带头插销****大桥斜拉索张挂施工方案***********工程公司-5-图411~27#索总体施工流程图三、主要施工方法1、施工准备（1）斜拉索挂索机具加工由于斜拉索为自身成盘，捆扎运输到施工现场。为防止在放索过程中产生危险，制作专门的放索限位架，将斜拉索装在限位架里锁好各道限位，再解除捆扎、放索。在斜拉索施工过程中，为避免斜拉索与桥面直接接触，损坏拉索的保护或损伤索股，在桥面上设置锚头小车和托索小车，托索小车的间距随斜拉索的布置及钢柔程度设置，一般每隔3～4m布置一个。斜拉索放索起吊牵引及张拉均需要准备起吊工索具、提吊头、夹具、张拉杆、撑脚、塔顶卷扬机及预埋件等辅助构件，均应在施工之前由专人负责准备。①放索小车为方便斜拉索在桥面的移动及展开，避免斜拉索与桥面的直接接触，防止斜拉索PE套损伤，斜拉索在桥面移动时采用放索小车，根据用途不同分为托索小车、锚头小车。托索小车结构见图5，锚头小车结构见图6。斜拉索塔端第三次张拉至设计值并锚固索力、主梁标高检测索力调整减震器安装主梁砼浇筑完毕砼养生、强度达90%，主梁预应力施工斜拉索梁端挂篮与混凝土梁体系转换****大桥斜拉索张挂施工方案***********工程公司-6-图5托索小车结构示意图图6锚头小车结构示意图②索夹索夹是斜拉索塔、梁端挂设的着力点，是挂索设施同斜拉索的连接工具。索夹采用厚壁钢管与钢板焊接而成，在钢管同斜拉索接触处加垫8mm厚的橡胶（通过PE提吊试验选定），施工过程中可以很好地保护斜拉索免受损伤，索夹结构见图7。图7索夹结构示意图D-DA-ACDBDC-CB-B****大桥斜拉索张挂施工方案***********工程公司-7-③张拉丝杆张拉丝杆加工材质采用40Cr，材料需经过超声波检验，并达到GB/T4162-2000《锻造钢棒超声波检验方法》规定B级以上，表面硬度达到HRC26-30，屈服强度为835MPa。按安全系数2.5进行张拉丝杆的设计。张拉丝杆的选择见表1。表1张拉丝杆型号型号直径（mm）长度(mm)螺纹允许张拉力(t)数量备注A1801.6Tr180×88494B1702.4Tr180×86004挂篮前支点④变径螺母变径螺母加工材质采取40Cr，材料需经过超声波检验，并达到GB/T4162-2000《锻造钢棒超声波检验方法》规定B级以上，表面硬度达到HRC26-30。螺母内、外径根据斜拉索锚杯内径与该索采用张拉杆型号进行确定。⑤张拉撑脚张拉撑脚主要根据使用千斤顶的外形尺寸进行选择，斜拉索的张拉控制力综合考虑后予以确定，张拉撑脚用型钢焊制。⑥张拉千斤顶张拉千斤顶根据斜拉索的张拉控制力进行选择，为减小施工过程中的误差、确保千斤顶的使用安全，尽量使每根斜拉索的张拉控制力只达到所用千斤顶允许能力的50%~85%范围内。张拉千斤顶的具体选型见表2。表2张拉千斤顶选用情况表型号（t）生产厂家数量(台)备注450OLM5650OLM5挂篮前支点⑦张拉油泵张拉油泵的选择根据OLM系列产品配套使用情况予以确定。油泵选用ZB-800型****大桥斜拉索张挂施工方案***********工程公司-8-超高压油泵。油泵性能指标见表3。表3ZB800油泵性能表型号额定油压（Mpa）额定流量（L/min）质量（Kg）外形尺寸ZB-8005010140745×4