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近年来,在用顶入法修建地道桥时应用气垫减少摩擦力,取得了不少经验。而气垫之关键乃气裙的构造及供气量的大小。天津市红旗路地道桥采用气垫顶拉新工艺,最近在滑板上起动获得了成功,同时还进行了真空吸附试验也取得了效果。该地道桥箱体分为前后两节,前节重2800吨,后节重3200吨,由于气垫的作用以较轻的前节作后背起动了后节,又用后节作后背起动了前节。起动顶力为550吨。而箱体的空顶阻力在没有气垫的情况下可增至1500吨,为实现两节箱体顶拉
In recent years, using the air cushion to reduce the friction when using the top-in approach to build the bridge, has gained a lot of experience. The air cushion is the key to the structure of the air skirt and the size of the air supply. Hongqilu Road Bridge in Tianjin using air-cushion roof pulling new technology, the recent successful start on the skateboard, but also conducted a vacuum adsorption test also achieved results. The road bridge box is divided into two sections before and after the weight of 2800 tons, the weight of 3200 tons after the section, due to the role of air cushion to the lighter before the start of the posterior section of the back section, but also with the back section for the back start Previous section Starting top force of 550 tons. The empty top of the box resistance in the absence of air cushion can be increased to 1,500 tons, in order to achieve two roof top pull