•  
  •  
 

Abstract

In order to meet the requirement that the channel should not be occupied during the construction of the 4th Bridge over the Panama Canal, an innovative construction scheme was proposed for the erection of the ultra-wide overweight steel box girder with central double cable planes (standard section length of 13 m, width of 51 m, and weight of about 370 t), or in other words, the steel box girder was divided into two horizontal segments after vertical segmentation and then horizontally lifted onto the bridge deck through the cable tower. The steel box girder was moved to the bridge deck crane at the cantilever end, and the tail moved forward and rotated 90° in the air. After adjusting the attitude, the steel box girder was horizontally moved to match the position. In order to understand the deformation of the steel box girder matching after horizontal segmentation and determine a reasonable docking process, the finite element software was used to analyze the local relative deformation of steel box girder installation with horizontal segments, and the results were compared with the whole segment installation. The results show that the method has an obvious horizontal biased load effect, especially in the middle lifting condition, but the deformation of the side web is significantly reduced than that of the middle web when the horizontal displacement is matched, and the maximum seam height difference is 4.2 mm. Compared with the whole segment installation, there will be two vertical and horizontal splicing planes after horizontal segmentation, among which the horizontal splicing plane deformation is larger than that along the bridge. Therefore, it is recommended to match the horizontal splicing plane first and then the remaining area of the horizontal bridge splicing plane after matching the middle web with greater stiffness. The splicing plane matching along the bridge should also prioritize the diaphragms with greater stiffness and then match the local area between the diaphragms. In general, the local relative deformation of the proposed horizontal segmentation scheme is controllable, and it can meet the construction requirements through reasonable matching methods.

Publication Date

3-17-2023

DOI

10.14048/j.issn.1671-2579.2023.01.018

First Page

108

Last Page

113

Submission Date

March 2025

Download

Share

COinS