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针对薄壳网槽目前普遍存在槽身渗水、碳化度高、筋网锈蚀、强度损失大等现象,研究采用在原槽表面包覆玻璃钢的强化技术。试验表明,玻璃钢与钢丝网水泥构件再复合后,可以形成协同工作的新复合体,使结构强度大幅度提高,既可发挥玻璃钢强度高的特点,又可充分利用原结构的刚度和强度。在试验的基础上,还提出了简便的补强计算方法,并经19节槽身现场施工及2节槽身的原型观测加以验证。结果表明,此项技术效果良好,是解决薄壳网槽工程老化问题的合理途径。
At present, there are many phenomena such as seepage of water in the shell, high carbonation, corrosion of tendons and large loss of strength. The experiment shows that the combination of FRP and steel mesh cement components can form a new composite body that can work together to greatly improve the structural strength, which can not only make the glass fiber reinforced with high strength but also make full use of the rigidity and strength of the original structure. On the basis of the experiment, a simple reinforcement calculation method is also proposed. It is validated by 19 tunnel body construction and 2 prototype body prototype observation. The results show that this technique works well and is a reasonable way to solve the aging problem of the thin-walled cell.