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（1 昆明市公路局， 昆明 650032； 2 北京中交橋宇科技有限公司， 北京 100102）
［摘要］隨著橋梁使用年限的增加，部分橋梁會出現(xiàn)結(jié)構(gòu)性受力裂縫、承載力下降的現(xiàn)象，需要及時進行加固處理。以某先簡支后連續(xù)裝配式部分預應力混凝土連續(xù)箱梁橋為例，對腹板加厚體內(nèi)預應力加固技術(shù)進行了分析，闡述了加固技術(shù)施工過程中的技術(shù)要點及注意事項，并對后期的加固效果進行了跟蹤。結(jié)果表明：該加固技術(shù)可以有效提高橋梁承載能力和結(jié)構(gòu)整體剛度，改善結(jié)構(gòu)的工作狀態(tài)；且同其他主動加固技術(shù)相比，具有加固后結(jié)構(gòu)物外形美觀、耐久性強等優(yōu)點。
［關(guān)鍵詞］箱梁； 受力裂縫； 腹板加厚； 體內(nèi)預應力； 加固技術(shù)
中圖分類號：TU279-7+2,TU375文獻標識碼：A文章編號：1002-848X(2018)04-0096-04
Example analysis and construction technical points of internal prestress reinforcement of box-shaped girder with thickening webs
Li Minghong1, Zhang Rui2
(1 Kunming Highway Bureau, Kunming 650032, China; 2 Beijing CCCC Qiaoyu Science and Technology Co., Ltd., Beijing 100102, China)
Abstract:With the increasing of bridge service time, some bridges appear phenomena of structural stress cracks and decrease of bearing capacity, so it is necessary to strengthen in time. Taking a simple partially supported continuous assembled partial prestress concrete box-shaped girder bridge as an example, the prestressed reinforcement technique for widening web was analyzed, the technical points and matters needing attention in the construction process were expounded，and the reinforcement effect in the later period was tracked. The results show that the reinforcement technique can effectively improve the bearing capacity of the bridge and overall rigidity, and perfect the working state of the structure. Compared with other active reinforcement techniques, the structure has the advantages of beautiful appearance, great durability.
Keywords:box-shaped girder; stress crack; web thickening; internal prestress; reinforcement technique
作者簡介：李明洪，高級工程師，Email: 826238043@qq.com。
