【摘 要】
：
南渡大桥是一座运营了42年的双曲拱桥,已出现多处病害且原设计荷载等级低,为满足目前的使用要求,对其进行加固.采用外包混凝土的方法增大主拱圈截面,同时提高拱肋配筋率；加大
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南渡大桥是一座运营了42年的双曲拱桥,已出现多处病害且原设计荷载等级低,为满足目前的使用要求,对其进行加固.采用外包混凝土的方法增大主拱圈截面,同时提高拱肋配筋率；加大横系梁截面,使其变成横向连接墙；增加L/8跨处系梁截面.施工中在主拱圈上植筋设置吊点,通过钢丝绳吊住拱下的吊架平台,拱下搭设施工吊架,采用吊架作为施工平台,模板采用拉杆吊挂系统进行支承,通过导流管完成自密实混凝土的浇注.加固后的南渡大桥满足设计和规范要求.
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