Row of circular arc steel pipe were used to support respectively in the steel pipe support longitudinal base and the crown on the skewback, causing the steel centering and the steel pipe support combines the overall rigid arch centering, both common stress, has enlarged the arch centering application span and the steel pipe support altitude effectively.

采用了在鋼管支架縱向底部和頂部各設置4排圓弧鋼管支撐于拱座上色羞羞在线视频，使鋼拱架與鋼管支架組合成整體剛性拱架国产丰满的富婆aa毛片，兩者共同受力美女被cao出水免费观看网站，有效加大了拱架的應用跨徑和鋼管支架的高度久久网一区。

The construction method of concreting layer by layer and segment by segment could reduce the use of steel and save construction cost,when concrete box arch ring was built cast-in-place with aid of arch centering.

混凝土箱型拱橋在無支墩拱式拱架上現澆施工時欧美A片最新网址，采用分環(huán)分段的施工方法久久911，可以利用拱圈與拱架的聯合作用，減少鋼拱架的用鋼量搜锁一个能看的毛片网站，達到節(jié)省施工成本的目的久玖玖视频在线播放。

voussoir：拱砌塊

卸架砂筒 sand cylinder for centering unloading | 拱砌塊 voussoir | 拱頂石 arch crown block