玻璃纤维(GFRP)筋替代钢筋在基坑支护桩中的应用  

Application of GFRP Bars in Supporting Structure of Excavation by Replacing Steel Bars

作　　者：赵升峰[1,2] 黄广龙[2] 章新[1] 赵小飞[1] 马世强[1] 

机构地区：[1]南京市测绘勘察研究院有限公司,江苏南京210019 [2]南京工业大学交通运输工程学院,江苏南京210009

出　　处：《安徽建筑大学学报》2016年第4期55-59,共5页Journal of Anhui Jianzhu University

基　　金：国家自然科学基金项目(41472283);南京市测绘勘察研究院有限公司立项课题(2014RD06)

摘　　要：玻璃纤维筋(GFRP)具有抗拉强度高、重量轻、耐腐蚀等良好特性,工程实践中常用于替代结构中的钢筋。以南京某基坑工程为例,探讨了GFRP筋替代钢筋用于基坑支护结构时存在的设计与施工问题,介绍了GFRP筋的基本特性、GFRP筋与支护桩冠梁的连接、GFRP筋自身的连接与搭接、GFRP筋笼制作方法以及浇筑混凝土时GFRP筋笼上浮的处理措施。GFRP筋在实际工程中应用表明:基坑土方开挖施工过程中,支护结构变形及周边地面沉降值均控制在允许范围内,基坑安全可靠。GFRP bars possess ifne characteristics, such as high tensile strength, light weight and superior corrosion resistance, thus are often used to replace the steel bars of structure in engineering projects. By taking a foundation pit excavation engineering in Nanjing as the example, problems in design and construction when using GFRP bars instead of steel bars in supporting structure are discussed. Furthermore, characteristics of GFRP bars, the joint between GFRP bars and top beam of supporting piles, connection and overlap among GFRP bars, manufacture of GFRP-bar cages and measures preventing cages floating upward during concrete casting are introduced. Applications of GFRP bars prove that if deformations of supporting structure and settlements of surrounding are both controlled within allowable ranges during construction, thus the foundation pit is safe and reliable.

关 键 词：玻璃纤维(GFRP)筋 支护结构 GFRP筋笼制作 GFRP筋连接 

分 类 号：TU473[建筑科学—结构工程]