With the increase of span of arch Bridges, ultimate load-carrying capacity has received more attention in design and construction.

随着拱桥跨径的不断增大，拱桥的极限承载力问题已引起了人们的广泛重视。

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Concrete was poured in separately from mid-span of arch slab to the supports and then from the supports to the top chord of the arch chord so as to balance the pouring load.

分两组由拱板下弦跨中同时向拱板支座浇筑混凝土，然后从拱板支座连续沿拱板上弦向中间合龙，使浇筑荷载相对均衡。

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Hanjialing Mountain tunnel is a key engineering in reconstructing the expressway from Shenyang to Dalian, and it is a highway tunnel with the greatest across span of arch in Asia.

韩家岭隧道是沈阳至大连高速公路改扩建关键工程，为目前我国和亚洲最大跨度的公路隧道。

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