预应力波纹管都有哪些特点及用途

2025-03-15 03:07:38
推荐回答(1个)
回答1:

预应力金属波纹管在现代建筑中,已被英、法、美、日等发达国家广泛使用,它质轻壁薄、刚性强、不破碎、不漏浆,因管体外表有明显的凹凸双波,钢管接缝处为紧密的压花型,牢固不脱扣,现场浇注后与混凝土接触握裹力极强,与混凝土结成完整的一体,增强了结构的抗震性能。它功能优良,与一般的实心平板相比,它自重轻,跨度大,挠度小,无柱帽,安全性好,综合造价低,因而提高了建筑净空,增加使用及销售面积,与国内现有的普通梁板结构、实心无梁板,无粘结预应力砼楼板相比较,节省钢材5%-7%,节省砼量10%-30%,节省竖向水、电、空调、电梯、内外墙装饰费用5%-15%,并具有隔音、隔热之功效,给业主带来可观的经济效益。
预应力金属波纹管主要用于公路桥梁,铁路桥梁,建筑水利,电力等国家重点工程。波纹管以及配件组成的预应力成孔系统,应满足后张预应力灌浆的需要;管和管之间的连接,除了热焊接连接外,还应提供专用的密封连接装置,此装置应带有孔道压浆过程的排气、排水、排浆和观察功效的排浆管,以达到压力灌浆或真空辅助压浆的需要。
预应力金属波纹管应具备如下要求:
1.具有一定的强度,能足以保持其形状,并抵抗施工中的破坏、穿透或变形;
2.具有足够的柔性,以便能适应特殊形式的预应力筋铺设的需要;
3.具有一定抗磨性,以防止孔道在传索、张拉时,预应力筋将成孔破坏。
4.波纹管内横截面面积至少为预应力筋的2~2.5倍
5.具有一定密封性,要保证波纹管和锚具,波纹管和波纹管之间的密封连接;
6.具有一定的粘结性能力
7.摩阻系数μ=0.12~0.15

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