Precise Matching Technique for Segmental Lifting and Erection of Wide PK Composite Girder of Long-Span Cable-Stayed Bridge

被引：0

作者：

Cao, Ming-Ming ^{[1
]}

Han, Yang-Yang ^{[2
]}

Wei, Le-Yong ^{[3
]}

机构：

[1] China Railway Bridge Science Research Institute, Ltd., Wuhan,430034, China

[2] Anhui Transportation Holding Group Co., Ltd., Hefei,230003, China

[3] CCCC Highway Consultant Co., Ltd., Beijing,100088, China

来源：

Bridge Construction | 2019年 / 49卷 / 06期

关键词：

Composite girders - Precise matching - Replacement methods - Segmental lifting and erection - T-shaped reaction frame;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The main bridge of Wangdong Changjiang River Highway Bridge is a two-pylon composite girder cable-stayed bridge with five spans of 78, 228, 638, 228 and 78 m. The stay cables are arranged in double cable planes. The main girder adopts the separated twin-box composite girder with PK section, and the girder segments are lifted and erected by using deck derrick cranes. During the lifting and erection of the main girder, the vertical deformation in the cross section of the already-installed girder segment makes the normal matching connection of the new girder segment and the already-installed girder segment difficult. To address this problem, the software ANSYS is used to analyze the causes of deformation difference during the lifting and connecting process of girder segments, and the precise matching technique of using the girder weight replacement method to match the already-installed segment and new segment and T-shaped reaction frames to rectify offsetting is proposed. The stay cables are tensioned to support the newly-installed segment and to release the front-support force generated during the unloading process of the deck derrick crane and the erection of the new girder segment, with the intention of allowing the vertical deformation in the cross section of the newly-installed girder segment to return to zero. Then, jack forces were applied through the T-shaped reaction frames to eliminate the vertical deformation caused by the self-weight of the deck derrick crane, so as to realize the precise matching of the already-installed girder segment and the new one. By using the girder weight replacement method and the T-shaped reaction frames to rectify offsetting, the precise matching connection of the new girder segments and the already-installed girder segments of the main bridge of Wangdong Changjiang River Highway Bridge was realized. © 2019, Journal Press, China Railway Bridge Science Research Institute, Ltd. All right reserved.

引用

页码：54 / 59