These are 12-inch-diameter tubes that have been inflated, bent to the proper shape and stiffened with a plastic resin, then installed side by side and stuffed with concrete, like giant manicotti.

多个直径12英寸的布套膨胀弯曲成合适的形状用塑料树脂增强然后并排安装并填充混凝土像巨型通心粉似的。