2014年11月下第43卷第22期
DOI:10. 7672/sgjs2014220073
施工技术
CONSTRUCTION TECHNOLOGY
FRP网格加固桥梁水下结构技术研究与应用
魏洋，吴刚2,张敏3
（1.南京林业大学土木工程学院，江苏南京210037；2.东南大学混凝土及预应力混凝土结构教育部重点实验室，江苏南京210096；3.北京特希达技术研发有限公司，北京100011）
结构加固技术具有造价高、工期长的缺点。以某桥梁的水下桩基础加固工程为背景，对比分析了3种不同的水下结构加固方案，通过工程实践应用，论证了纤维网格（FRP网格）加固桥梁水下结构技术的可行性，提出了FRP网
不分散材料为黏结材料，实现对桥梁水下结构的快速加固修复。FRP网格加固桥梁水下结构技术是一种新的有效
技术，尤其在无法或难于修筑围堰的情况下，具有广阔的应用前景。［关键词］桥梁工程；水下结构；FRP网格；加固；施工技术
［中图分类号】TU746.3;U443.22
【文献标识码］A
［文章编号】1002-8498（2014)22-0073-05
StudyandApplicationofTechnologyofFRPGridsReinforced
UnderwaterBridgeStructures Wei Yang',Wu Gang’,Zhang Min
( 1. College of Ciril Engineering , Nanjing Forestry Uniwersity, Nanjing, Jiangsu 210037, China; 2. Key Laboratory
for RC and PRC Structures of Education Ministry, Southeast Uniwersity, Nanjing, Jiangsu 210096, China;
3. Bejing Texida R&D Co. , Lud. , Bejing 100011, China)
Abstract: Underwater structures exist widely in the field of the practical bridge engineering, and underwater bridge structures often face the requirement of retrofit, but there are some shortcomings such as high cost and longer construction schedule for the traditional underwater strengthening technology- In this paper, based on a project of strengthening underwater piles of a bridge, three different technologies seeeas strengthening underwater bridge structures using the fiber reinforced polymer grids (FRP grids) was verified through the practical engineering application. The construction technology of FRP grids reinforced underwater bridge structures was proposed in which no drainage underwater construction is presented as the key guiding ideology, and high-strength and lightweight FRP grids and underwater non-dispersion material are taken as the strengthening material and bonding material, respectively. This technology achieves a rapid retrofit and rehabilitation of underwater bridge structures. The technology of FRP grids reinforced underwater bridge structures is a new effective technique, especially when the construction of cofferdam is hard or with no possibility, and has a good application prospects.
Key words: bridges; underwater structures ; FRP grids; reinforcements; construction
桥梁水下结构在我国桥梁结构工程实践中普遍存在，包括水下桥墩及水下桩基础等，其在桥梁结构中起着将上部荷载传递到地基上的重要作用，
*交通部西部交通建设科技项目（2011318816980）；国家自然科学基金（51208262）；江苏高校优势学科建设工程资助项目（PAPD
作者简介魏洋，博士，副教授，国家一级注册结构工程师，E
mail:wy78@ njfu. edu. c【收稿日期］2014-02-16
73
结构性能关系到整座桥梁安全使用性能。调查发现，由于桥梁水下结构常常位于水下，在河水冲刷、淘刷、磨损、气蚀、冻融和侵蚀（化学腐蚀和电化学腐蚀）、船舶碰撞、浮冰及地震装击、环境荷载（如生物附着）等各种因素的共同作用下，常常使得桥梁水下结构发生各种损伤与缺陷。因此，对桥梁水下结构的加固修复显得尤为重要，然而，由于桥梁水下结构的水下工程特点，使得桥水下结构的加固