Minato Civil Introduction

Construction Examples

Landmarks Known At Home & Abroad

Rainbow Bridge

Minato Civil was involved in constructing the Rainbow Bridge: a suspension bridge connecting the districts of Shibaura and Odaiba in Tokyo’s Minato-ku that opened in 1993 after six years of construction.

Both bridge banks were reclaimed land sitting at low elevation, and there were restrictions on the longitudinal gradient imposed by the new traffic/road system.

Minato Civil was in charge of the bridge pier foundations. We drove in steel pipe pier foundations in the sea at a depth of about 10 meters and subsequently laid the bridge pier.
Although heavily impacted by waves and wind, we completed the project with safety our foremost priority.

The Rainbow Bridge has a promenade, from where you can see passenger boats floating in the blue sea as well as great night views of Tokyo.

Gate Bridge

Minato Civil was also involved in paving works for the Tokyo Gate Bridge: a 2,618-meter truss bridge connecting the islands of Jonanjima in Ota-ku and Wakasu in Koto-ku, which opened in 2012 after nine years of construction.

For these paving works, Minato Civil chose to use mastic asphalt pavement, which offers high adhesion to the bridge’s steel deck and has excellent deformation flexibility. Mastic asphalt pavement uses a heated mixing and pouring method that takes advantage of the fluid qualities of asphalt mixture at high temperatures without using roller compaction. Precise quality control was essential, because mastic asphalt is susceptible to external temperature influences.

Building this bridge improved public access to main arterial roads as well as improving logistic efficiency, easing traffic congestion within the Tokyo port area by about 30%.

Pink Crane

The 75-ton telescopic crane owned by Minato Civil bears a pink polka dot pattern. The reason for making the crane pink was to give a friendly sense of familiarity with construction work. Most people see a pink crane and think, "What’s that?!" It’s often posted on social media these days. This 75-ton telescopic crane (hydraulic telescopic boom crane) boasts excellent boom mobility, and it functions even when height is restricted—for example, when under metropolitan highways or bridges.

Currently, there are only two marine-based telescopic cranes in Tokyo and it seems to become involved in all kinds of construction projects.