Based on their respective environments and conditions, the capital city highlights the total from the design of structures such as long tunnels and large bridges to construction management.
City Long Tunnel
The Yamate Tunnel is an underground tunnel located in the route between Ikebukuro and Oi, the circular route. It is a long tunnel with a total length of about 18km, and its length is ranked first in Japan and second in the world.
In the construction of the Yamate Tunnel, innovative technologies such as large section shield tunnel construction method and non open cut method are adopted.
Large-Section Shield Tunneling Method
The large-section shield tunneling method was mainly used in the construction of the Yamate Tunnel to minimize the effect on traffic in existing roads and to reduce noise and vibration in the surrounding area during construction. The outside diameter of the shield tunnels is 11.2 to 13.0 meters.
Non-Open-Cut Construction Method
Application of the Non-open-cut method to enlarge the shield tunnels connecting with the ramp way after the shield tunnels are constructed can minimize the effect on the aboveground traffic and underground facilities.
The Rainbow Bridge is a suspension bridge with double decks and spans the first channel of Tokyo Port. The upper deck is occupied by the Route 11 Daiba Line, and the lower one by Port Road, a walkway, and Yurikamome, a new mass transit system.
Structural Type: Suspension bridge Length: 798 m (center span 570m) Height of tower (from the sea level): 126m Date of opening: August 1993
Yokohama Bay Bridge
The Yokohama Bay Bridge has double decks and spans the Yokohama international channel. The upper deck is occupied by the Bay-shore Route, and the lower one by the Route 357.
Tsurumi Tsubasa Bridge
The Tsurumi Tsubasa Bridge is a bridge crossing over the Tsurumi Fairway. At the time of its completion, it was the world's largest cable-stayed bridge with single-plane cable stays.
Other Bridge Types
The Goshikizakura-Ohashi Bridge is the world's first double-deck Nielsen-Lohse system bridge. It crosses the Arakawa River near the Kohoku JCT.