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针对后张法预应力箱梁桥底板出现沿预应力波纹管走向开裂、渗水等问题,分析了因压注的水泥浆水胶比偏大、泌水多、浆液未压饱满、压入孔道内的水泥浆受冻、现场质量管控不到位等原因,介绍了打眼排水、开槽清孔、压注改性环氧树脂、粘贴碳纤维布等处治措施,提出了孔道压浆及时、密实、浆液原材料和机具选择、加强施工过程质量管理等建议。
In view of the problems such as cracking and water seepage along the prestressed bellows along the bottom of prestressed box girder bridge after post-tensioning method, it is analyzed that the water-cement ratio of grout is too large, Of the slurry by the cold, on-site quality control is not in place and other reasons, introduced the drilling drainage, slotted hole, pressure injection modified epoxy resin, paste carbon fiber cloth and other measures to deal with the proposed pore pressure grouting timely, dense, slurry raw materials And machine selection, to strengthen the construction process quality management and other recommendations.