提高高腹板箱梁竖向预应力压浆畅通度的研究
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摘要
现阶段我国大跨连续箱梁桥普遍采用纵横竖三向预应力体系,其中竖向预应力的使用增强了腹板的抗剪能力,防止裂缝的产生。但在实际施工过程中,竖向预应力常常出现压浆不密实的情况,不能使预应力筋与梁体混凝土牢固粘结为整体,还会引起预应力筋锈蚀,从而影响预应力梁的寿命。本文根据长湾澧水大桥竖向预应力筋施工方案,总结了如何提高竖向预应力孔道压浆畅通度,可为类似工程提供参考。
At present, the three-directional prestressed system is generally adopted in the large span continuous box girder bridge in our country. The use of vertical prestress strengthens the shear ability of the web and prevents the crack. However,in the actual construction process, the vertical prestress is often not compacted by grouting, which not only fails to make the prestressing tendons firmly bond with the beam concrete as a whole, but also causes the corrosion of the prestressing tendons, thus affecting the service life of the prestressed beam. Based on the construction scheme of vertical prestressing tendons of Changwan Lishui Bridge, the author summarized how to improve the smoothness of vertical prestressed duct grouting, which could provide reference for similar projects.
At present, the three-directional prestressed system is generally adopted in the large span continuous box girder bridge in our country. The use of vertical prestress strengthens the shear ability of the web and prevents the crack. However,in the actual construction process, the vertical prestress is often not compacted by grouting, which not only fails to make the prestressing tendons firmly bond with the beam concrete as a whole, but also causes the corrosion of the prestressing tendons, thus affecting the service life of the prestressed beam. Based on the construction scheme of vertical prestressing tendons of Changwan Lishui Bridge, the author summarized how to improve the smoothness of vertical prestressed duct grouting, which could provide reference for similar projects.
引文
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[2]于晓光.扫描式冲击回波法在检测管道灌浆情况中的应用[J].桥梁检测与加固,2008(1):12-14.
[3]刘晓姗.扫描式冲击回波仪应用于刚性路面脱空检测的判定方法研究[D].北京:北京工业大学,2013.
[4]叶健.采用IES冲击回波法检测预应力混凝土灌浆质量[C]//第十届全国建设工程无损检测技术学术会议论文集.北京:中国土木工程学会,2008.
[5]姚华.扫描式冲击回波法检测后张预应力管道内缺陷的模型试验研究[D].重庆:重庆交通大学,2008.
[6]李江山.预应力连续箱梁设计应注意的问题[J].公路,2002(2):4-7.
[7]王萍,柯在田.公路预应力混凝土桥梁裂缝分析[J].公路,2005(6):14-17.
[8]李俊,李小珍,卫星,等.连续刚构桥底板纵向裂纹原因分析[J].公路,2005(9):1-5.
[9]詹建辉,陈卉.特大跨度连续刚构主梁下挠及箱梁裂缝成因分析[J].中外公路,2005(1):56-58.
[10]王法武,石雪飞.大跨径预应力混凝土梁桥长期挠度控制研究[J].中外公路,2006(8):72-76.
[11]雷明昶.高墩现浇预应力连续箱梁施工技术[J].铁道建筑技术,2011(S1):88-92.
[12]刘亚东,秦宗平,金卫兵.预制节段拼装连续梁桥设计要点和施工关键技术[J].铁道建筑技术,2006(5):50-55.