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一座净跨30米的双曲拱桥,由于基础处理不当,两台产生严重水平位移和垂直沉陷,拱顶下沉37厘米,主拱圈严重开裂,跨径增长0.24米。加固措施为:利用台背两侧路基挡土墙,增设四根钢筋混凝土水平支撑梁;挖除台背高填土,增设浆砌块石摩阻箱;台前抛石加重,阻止桥台后倾和前移;台背每个隔仓摩阻底版凿洞压灌水泥砂浆,加固基础;在拱顶区域,拱肋裂缝密集部份,增设钢筋托架。加固后经测试、观察,效果良好,现已正式通车使用。
A double-curved arch bridge with a net span of 30 meters has a serious horizontal displacement and vertical subsidence due to improper basic treatment. The vault sinks 37 cm and the main arch ring severely cracks, increasing the span by 0.24 m. Reinforcement measures are as follows: four reinforced concrete horizontal support beams are to be added by using subgrade retaining walls on both sides of the back of the platform; excavation of backfill and filling of stone friction box with grouting blocks; Dumping and moving forward; the back of each compartment friction plate drilling hole pressure grouting grouting, reinforcement foundation; in the vault area, arch ribs crack-intensive part of the addition of steel brackets. After the reinforcement test, observation, the effect is good, is now the official opening.