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玻璃钢是由玻璃布与环氧树脂胶结而成,它具有抗拉强度高、可塑性好、耐腐蚀性强等优点。近年来在我区造船工业上已初步使用,在桥梁基础工程上才开始接触。南宁港北大码头建筑立式码头,半填半挖筑岛浇注沉井,由于地基和结构等原因,其中4~#沉井拆模后发现混凝土产生严重裂缝。裂缝宽度一般达5～10毫米,宽者达30毫米。裂缝长度,一般由沉井刃脚沿伸到1/2～2/3H(H为高),见图一。如此严重开裂的沉井,如不作加固处理,是根本无法下沉的。在开始研究如何加固时,提出了下列几种方案:
FRP is made of glass cloth and epoxy resin, it has high tensile strength, good plasticity, corrosion resistance and other advantages. In recent years in our region has been the initial use of shipbuilding industry, the bridge foundation project began to contact. Due to the foundation and structure and other reasons, 4 ~ # caisson wells after demolition found serious cracks in concrete. Crack width of 5 to 10 mm generally, the width of 30 mm. The length of the crack, usually extending from the sinkhole edge to 1/2 ~ 2 / 3H (H is high), see Figure 1. Such a serious caisson, if not for reinforcement, is simply unable to sink. In the beginning to study how to reinforce, proposed the following options: