基于实测温差模式的顶推钢箱梁拼装时机研究

侯亚辉¹，宋涛²，邵伟¹，崔立恒¹，张成明¹

1.山东省公路桥梁建设集团有限公司，山东 济南  250021；2.山东交通学院交通土建工程学院，山东 济南  250357

摘要：为解决顶推钢箱梁拼装施工中由温差变化引起钢箱梁线形变化的问题，根据桥梁所处位置的实测钢箱梁竖向温差变化规律，拟合竖向温度梯度曲线，研究温差模式对梁体拼装梁端夹角的影响。研究结果表明：梁体顶底板竖向温度梯度对待拼梁体的梁端夹角有显著影响，不同梁段应选择合理的顶底板温差及不同时间段进行拼装。

关键词：桥梁工程；拼装时机；温差模式；钢箱梁；顶推施工

Assembly time for incremental launching steel girder on measured temperature difference model

HOU Yahui¹, SONG Tao², SHAO Wei¹, CUI Liheng¹, ZHANG Chengming¹

1. Shandong Road and Bridge Construction Group Co., Ltd., Jinan 250021, China；

2.School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, China

Abstract:To provide technical basis for assembly steel girder in incremental launching method, aimed at the problem of assembling steel girder leaded erection line change which is influenced by temperature variation. According to the vertical temperature variation of steel girder measures in situation, temperature gradient model is fitted, and the influence of angle for assembly steel girder end under different temperature gradient model is investigated. The results show that angle of assembly steel girder end caused by temperature gradient of top and bottom plane is remarkable. Different assembly temperature scope for top and bottom plane of steel girder is suitable to different segments.

Keywords:bridge engineering; assembly time; temperature gradient difference model; steel box girder; incremental launched girder