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| Calculation of manufacturing dimensions of steel box girders based on geometric control method |
Li-feng LI1( ),Shun-hang ZHENG1,Ji-quan LI2,Yun-qiang LU3,Qi-hao JIANG1 |
1. College of Civil Engineering, Hunan University, Changsha 410082, China
2. Foshan Communications Investment Group Limited Company, Foshan 528000, China
3. China Railway Major Bridge Engineering Group Limited Company, Wuhan 430000, China |
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Abstract The calculation of the manufacturing dimensions of steel box girder is the key to ensure the smooth closure of the whole hoisting of the long-span asymmetric hybrid girder bridge and to meet the design requirements. A method of angle compensation based on the geometric control method was proposed, taking a four-span asymmetric hybrid girder bridge as the research object and matching the end face parallel docking as the control basis. The manufacturing angle of the end face of steel box girder was calculated, and a calculation method of the cutting length of the top and bottom surfaces was proposed to determine the manufacturing dimensions of steel box girder. Results showed that the steel box girder was successfully hoisted. When the first main span was closed, the relative seam widths of the top and bottom plates of the two matching faces were 8 and 5 mm respectively, while the widths second main span were 2 and 5 mm respectively. The width of each matching face was less than the design limit of 15 mm, and the parallel butt was realized. The linear shape of the main beam measured after closing was smooth, and the maximum elevation error was less than 3 cm, which verified the accuracy and the applicability of the calculation method of the manufacturing dimensions of steel box girder.
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Received: 28 November 2022
Published: 16 October 2023
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| Fund: 国家自然科学基金资助项目（51978257, 52278176） |
基于几何控制法的钢箱梁制造尺寸计算
钢箱梁制造尺寸的计算是确保大跨非对称混合梁桥整体吊装顺利合龙、成桥线形满足设计要求的关键. 基于几何控制法，以四跨非对称混合体系梁桥为研究对象，以匹配断面平行对接为控制依据，提出倾角补偿的方法. 计算钢箱梁端面的制造倾角，提出顶、底面配切长度的计算方法，确定钢箱梁制造尺寸. 结果表明：钢箱梁整体吊装顺利，第一主跨合龙时2个匹配断面顶、底板相对缝宽分别为8、5 mm，第二主跨的相对缝宽分别为2、5 mm，各个匹配断面的相对缝宽均小于设计限值15 mm，实现了平行对接；合龙后实测主梁线形平顺，最大标高误差不超过3 cm，验证了钢箱梁制造尺寸计算方法的准确性和适用性.
关键词：
非对称混合梁,
几何控制,
制造尺寸,
平行对接,
整体吊装
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