南水北调中线工程某跨渠桥盖梁抱箍法施工

Capping beam construction by hold hoop for a cross-canal bridge of Middle Route Project of South to North Water Diversion

南水北调中线工程河南省境内的禹州至长葛段跨渠桥梁上部结构采用简支或先简支后连续预应力混凝土箱梁,下部结构由钻孔灌注桩、柱式墩及盖梁组成。桥梁与渠道存在施工交叉问题,而桥梁下部结构的盖梁施工进展顺利与否关系到整座桥梁的建设工期。以某典型跨渠公路桥为例,针对盖梁施工的抱箍法和满堂支架法进行比选。施工验算表明,盖梁抱箍法施工安全可以保障,具有施工可操作性强、成本低、进度快等优点,可为类似桥梁工程的盖梁施工提供参考。

For the cross-canal bridges of Yuzhou to Changge in Henan Province,Middle Route Project of South to North Water Diversion,the upper structure is usually composed of pre-stressed concrete box-beam of simply-supported or simply-supported and continuous pre-stressed concrete beam,and the lower structure is composed of bored pile,pile-abutment and capping beam.The construction disturbance between channel and bridge would influence capping beam construction and further influence bridge construction schedule.We carried out a comparative analysis for capping beam construction by hold hoop and full supporting methods respectively.The engineering calculation shows that hold hoop construction can ensure safety and possesses advantages of good operability,lower cost and fast construction.