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箱形拱桥悬扣施工是大跨径拱桥施工中一种新的比较理想的方法。这种方法的主要特点是增加拱圈的分段数,减少每一拱段的重量,降低对起吊设备的要求,从而在现有吊装设备的条件下提高拱桥的跨越能力。 在吊装过程中,每一预制拱段的一端支承于已安装好的拱段的端部,而另一端通过扣索(拉杆)悬挂于塔顶,并通过安装在塔顶的穿心千斤顶以及拉杆上的螺栓调节拱段的扣挂位置。由于拱圈在合拢前在大多数情况下已属超静定结构,调整拉杆长度将会改变拱圈的受力状态,因此拉杆的长度一次不宜调整过多。为了减少调整次数,这就要求
Box arch bridge hanging buckle construction is a new ideal method for construction of long-span arch bridge. The main features of this method are to increase the number of sections of the arch ring, reduce the weight of each arch segment and reduce the requirements on the lifting device so as to improve the spanning capability of the arch bridge under the existing lifting equipment. During the hoisting process, one end of each prefabricated arch is supported at the end of the installed arches, while the other end is suspended from the tower top by a buckle (tie rod) and passed through a jack-mounted jack and a tie rod Adjust the bolt on the arch section of the hanging position. As the arch ring in most cases before the collapse has been statically indeterminate structure, adjust the length of the rod will change the stress state arch, so the length of the rod should not be adjusted too much. In order to reduce the number of adjustments, this requires