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Preliminary design of the Caldecott fourth bore

机译:Caldecott第四孔的初步设计

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摘要

The existing Caldecott Tunnels consist of three bores along State Route 24 (SR 24) through the Berkeley Hills in Oakland, CA. The California Department of Transportation (Caltrans) and the Contra Costa Transportation Authority (CCTA) propose to address congestion on SR 24 near the existing Caldecott Tunnels by constructing a fourth bore that will provide two additional lanes. The length of the proposed fourth bore is 1,036 m (3,399 ft). The project will include short sections of cut and cover tunnel at each portal, seven cross-passageway tunnels between the fourth bore and the existing third bore, electrical substation buildings at either portal and a new operations and control building.
机译:现有的Caldecott隧道由沿着加利福尼亚州奥克兰市的伯克利山的24号州际公路(SR 24)组成的三个钻孔组成。加利福尼亚州交通运输部(Caltrans)和Contra Costa交通管理局(CCTA)建议在现有的Caldecott隧道附近修建SR 24来解决拥堵问题,这将增加第四个车道,从而增加两条车道。建议的第四个孔的长度为1,036 m(3,399 ft)。该项目将包括每个入口的切入式和覆盖式隧道的短段,在第四个钻孔和现有的第三个钻孔之间的七个交叉通道隧道,两个入口处的变电站建筑物以及一个新的操作和控制建筑物。

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