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在全国各地采用“土牛”代替拱架砌筑石拱桥的施工方法启民下,我们在修建北京市郊怀河公路上,也采用“土牛”就地捣制1孔5米、2孔5米(跨径)两座钢筋混凝土板梁桥面获得良好效果。施工方法:施工前先将河流改道。下部砌体竣工后,即可进行填筑“土牛”,土层填筑时应在台身内外平衡上升,使台身(主要轻型轿台)不致因土压而变形。填筑土牛时,需分层夯实;土壤密度当距板梁下20厘米时应控制为85～90％;50厘米以上应控制90～95％。“土牛”填筑高度距板梁下15厘米时,为保持土层平整,故用1∶5石灰土铺平,并经人工夯实,使形成一个整片硬层。灰土铺筑后,晾晒1～2
In all parts of the country using “soil cow” instead of arching masonry arch bridge construction method Kai-we, in the construction of the outskirts of Beijing on the River Wye, also used “soil cow” on-site ramming 1 hole 5 meters, 2 holes 5 meters Span) two steel-concrete slab deck to obtain good results. Construction Methods: Before the construction of the river diversion. After the completion of the lower part of the masonry, “soil cattle” can be filled in. When filling the soil, the inside and outside of the platform should be balanced and balanced, so that the table body (mainly the light platform) will not be deformed due to earth pressure. Filling cattle, the need to tamp compaction; soil density from the plate girder 20 cm should be controlled for 85 to 90%; 50 cm above should be controlled 90 to 95%. “Tu Niu” filling height 15 cm below the plate girder, in order to maintain the formation of the soil, it is paved with 1: 5 lime soil, and by manual compaction, so that the formation of a whole hard layer. Lime soil paving, drying 1 ~ 2