Urban Long Tunnels

Yamate Tunnel

The Yamate Tunnel is an underground road tunnel located in the Central Circular Sinjuku & Shinagawa Route. One part of tunnel in the Shinjuku route with a total length of 10 km is now in service, while the remaining part of a total length of 8.0 km in the Shinagawa route is now under construction.
Once the Yamate tunnel is fully opened in FY 2013, it will be the Japan's 1st and World's 2nd longest road tunnel.

Yamate Tunnel

Various innovative technologies were adopted in the construction of the Yamate Tunnel. These include the large-section shield tunneling method and the non-open-cut construction method.

Non-Open-Cut Construction Method

Large-Section Shield Tunneling 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.

Large-Section Shield Tunneling Method

Non-Open-Cut Construction 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.

Large-Scale Bridges

Suspension Bridges

Rainbow Bridge

Rainbow Bridge

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

Cable-Stayed Bridges

Yokohama Bay Bridge

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.
Structural Type: Cable-stayed bridge (double plane cable stays)
Length: 860 m (center span 460m)
Height of tower (from the sea level): 175m
Date of opening: September 1989
Tsurumi Tsubasa Bridge

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. Structural Type: Cable-stayed bridge (single plane cable stays)
Length: 1,020 m (center span 510m)
Height of tower (from the sea level): 183m
Date of opening: December 1994

Other Bridge Types

Goshikizakura-Ohashi Bridge

Goshikizakura-Ohashi Bridge

The Goshikizakura-Ohashi Bridge is the world's first double-deck Nielsen-Lohse system bridge. It crosses the Arakawa River near the Kohoku JCT.
Structural Type: Nielsen-Lohse arch bridge
Length: 142 m
Date of opening: December 2002