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港珠澳大橋開(kāi)通，這10件事你要知道

2018-10-23 08:51來(lái)源：央視新聞

3、為什么要建海底隧道，一橋到底不行嗎？

港珠澳大橋的路線(xiàn)經(jīng)過(guò)了伶仃洋海域中最繁忙的主航道，目前達到10萬(wàn)噸級通航等級，遠期30萬(wàn)噸油輪可以通行。如果建造橋梁，必然是跨徑很大，凈空很高、橋塔聳立的懸索橋梁。但同時(shí)該處臨近香港國際機場(chǎng)，航空領(lǐng)域的建筑物高度限定使得該區域無(wú)法實(shí)現大跨徑、高塔結構物。

所以，隧道成為唯一可行的方案。為了實(shí)現橋梁與隧道之間的轉換，故在隧道兩端修建人工島。于是，這就構成了港珠澳大橋的橋島隧相結合的建設方式。

港珠澳大橋隧道（圖／視覺(jué)中國）

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[責任編輯：施冰冰]

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