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桁架拱片的安装是桁架拱桥施工中的关键性工作。由于拱架片平面尺寸大,拱片薄,侧向刚度很小。目前多数采用分段预制、吊装、拼装接头的施工方法。泰县水利局从1980年起,在20米以下桁架拱桥施工中,采用由角钢组焊成的复式钢桁梁,加强桁架片的刚度,进行整片吊装,取得较好效果。具体做法是:在预制拱片时,先预留孔距一米的孔眼。吊装前用活动夹板、螺栓将
The installation of truss arch is the key work in truss arch bridge construction. As a result of the large flat arch surface piece, arch thin, lateral stiffness is small. At present, the majority of the use of prefabricated, lifting, assembly joints construction method. Since 1980, Taixian County Water Conservancy Bureau has adopted the composite steel truss girder welded by angle steel to enhance the rigidity of the truss piece and hoisting it in the whole piece under the construction of truss arch bridge below 20 meters, and achieved good results. The specific approach is: precast arch, the first hole reserved for one meter from the hole. Hoisting activities before the splint, bolts will be