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4021大桥北岸3～6号墩均为沉井基础,混凝土数量达15,000多方。这样大数量的混凝土灌注,当时仅有一台16吨轮胎吊机,由于吊距小,施工中吊机需要绕沉井行转下料;或者固定在沉井一侧下料,由人工将混凝土转到另一侧。如果吊机行转,每移动一次,都要重新安装锚固设备。其中5、6号墩位于水中,不可能使用轮胎吊机。如果将吊机固定于沉井一侧下料,不但人工转运混凝土劳动强度很大,还易发生如4号墩由于混凝土偏压,使模板变形,形成“鼓肚子”现象。毛主席教导我们:
4021 North Bridge Pier No. 3 to 6 are all caisson foundation, the number of concrete more than 15,000 square. Such a large number of concrete pouring, there was only a 16-ton tire crane, due to the small hanging distance, construction crane cranes around the need to turn the expected material; or fixed in the side of the caisson, the manual transfer of concrete To the other side. If the hoist is moving, reinstall the anchoring equipment every time you move it. Where Pier 5 and 6 are located in the water, it is not possible to use tire cranes. If the crane is fixed on one side of the caisson, not only the labor intensity of the artificial transfer concrete is very large, but also the deformation of the template due to the bias of the concrete on the pier 4 is easy to occur, resulting in the phenomenon of “bulging belly”. Chairman Mao taught us: