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在桥梁上部结构进行顶推施工时,联邦德国利用了气垫作为滑动设备,这样可以简化推移的过程。在需要顶推的梁体6下表面设预留槽3,其内安放气包4,由此喷出空气在气包与滑动表2之间形成一层薄的气垫(气膜),空气的压力在各处保持均等。气包的形状是环形的,以利形成进气的闭合空间。
In the superstructure of the bridge to push the construction, the Federal Republic of Germany used the air cushion as a sliding device, which can simplify the transition process. In the need to push the lower surface of the beam body 6 is provided with a reserved groove 3, the air bag 4 is placed therein, thereby ejecting air between the air bag and the sliding table 2 to form a thin air cushion (air film), air Pressure stays the same everywhere. The shape of the gas bag is annular so as to form a closed space for the intake air.