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1、现浇预应力混凝土连续箱梁桥的施工1.工程概况桐寨铺互通A匝道桥（AK0+605.496匝道桥）全长256m，上部采用4*20+(20+2*25+20)+4*20m跨径组合，其中第二联为三室等截面预应力混凝土箱形连续梁，第一、三联为三室等截面钢筋混凝土箱形连续梁，梁宽15.5m，梁高1.3m。2.支架施工2.1支架基础桥下地表平坦，承台基坑采用灰土分层夯实填筑后，在支架搭设范围内填筑不小于50㎝厚的灰土，然后浇筑10㎝厚的砼基础。2.2支架塔设上部箱梁施工采用（碗扣式）钢管支架作为支撑，承重部分由纵向和横向的工字钢组成，组合钢管支架采
2、用工字钢联成整体，横向设剪力撑，使其连成一体。根据支架实际的纵向和横向间距布设，考虑施工的恒载，活载计算支架的承载力，验算其稳定性。2.3支架预拱度设计与拱度计算公式为f=f1+f2+f3，其中f1:地基弹性变形，f2:支架弹性变形，f3：梁体挠度。f2=σL/E计算，f3根据施工经验取20m跨径为2cm，25m跨径为2.5cm。预拱度最大值设置在梁的跨中位置，并按抛物线形成进行分配，算得各点处的预拱度值后，通过支架上的砂筒对底模进行调整。villagetemplesCentralOfficeeveryday,carryoutthe
3、irduties.CorrespondencerelatingtoeducationbytheChiefofthefirstsectionmarkedmydraftstatement.Workedafterafewmonths,I'vebeenburiedintheofficialprogram,veryrigidmonotonyofclericalcareer,flavourless.1939of7Augustbetween,County,andSecretarytoIwithtoOfficemeeting,forGovernme
4、ntestablishedoneyearstoworkreported,fortimerush,priornotforfullprepared,hadtoinwaybyrankAnnMrdescribedoneyearstoaboutpeople,andfiscal,andbuilt,andtaught,andinsurancefiveaspectsimportantmatters,Iaccordinglydetailednarrativefinishingwritten,completedWujiangGovernmentesta
5、blishedoneyearstoofworkreport.TurnbackandforthmonthShanRoad,apartfromtheSecretary,Mrrankfootdiseaseimmobility,bamboocarinsteadofwalkingoutside,squarefoot(exceptformyselfand4guards),thewuxing,peace,SIan,Guangde,doorwayswing,ZhangZhutothedestination--wearingBu.Atdiweitot
6、heimportanttownsoftroopsisdifficulttoaccess,wehavetochangeangles,Shanruggedtrails,Sunandrainontheway,hardshipexceptions,ifthepatrioticandpassionsofthewar,thanthesuccessfulcompletionoftasks.Anoldfrail,rank,long-distanceLawtonregrets,admirable!InNovember1939,Iwasadmitted
7、totheFacultyoflaw,CollegeoflawandpoliticsinShanghai,butresignedfromthepostoffice,bidfarewelltothisshortandmemorablelife.(J)thesiazhenboatburiedJapanesemorningofOctober18,1937,siazhensicktoshunTangQiao-cutters,1fromNanxuntownjiaxingtoJapaneseboats,caughtdraggingbehind3s
8、mallboats,loadedwithmilitarygoods.Siazhentoolatetoescape,jumpedashoreJapancatchupwiththeboat,forcinghimtorowaboat.Mea
