Hongfeng Lake Bridge Hanging Basket Construction Methods Research

The construction method of main girder of cable-stayed bridges needs not only considering the structural system of cable-stayed bridges, arrangement of cables, cross-section of the main girder, but also considering construction technology, equipments and the condition on the spot. Due to the influence of topography and the environment, traveling carriage is adopted in main girder construction of this bridge. Equipments i n c onstruction, technology and analog computation are mainly researched in this paper. The work has been done as the following:1. The type, force character, applicability of traveling carriage and application condition of traveling carriage in China are summarized. And the evolution direction for traveling carriages is brought forward.2. The structural configuration of traveling carriage is demonstrated. The connection problem of anchor joint between space cable and traveling carriage is solved by arc-shaped beam and former anchoring beam. It is the first time for traveling carriage made of standard rods to be applied in construction of main girder of cable-stayed bridges with space cables.3. Self-weight drooping affection on cable's angle is analyzed. The droops-modified formula of cable's angle is derived. Alteration calculation about cable's angle of Hongfeng Lake Bridge is done, and the relative location of fore-anchored beam to arc-shape beam is determined accurately.4. The piecemeal construction technology with traveling carriage is put forward: 0# section, 1# section, standard section construction technology and closure section construction technology.5. According to the force limitations for the key parts of the traveling carriage, the methods, principle and procedures for the determination of the scope of fore-fulcrum force are given. Based on the characters of this bridge, the computer program is developed and numerical calculation for this bridge is applied during construction.6. Analog computation process of construction with traveling carriage is brought forward, and the determination methods of tensioning process of cables, initial tensioning force and initial erection altitude of each section are discussed.