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Homan Dam was the beginning of Daiho Corporation

In 1936, civil engineering technicians were engaged in constructing Homan Dam, a gigantic dam designed for the Sungari River to resolve electricity shortages in the former Manchuria, and they later established Daiho Corporation.

Story of Daiho



Our Work of Roads and Tunnels

Our Works


Bridge Foundation Work

We undertook the foundation work for the Rainbow Bridge on the Shibaura side

The Rainbow Bridge, which was completed in 1993, adopted Daiho’s pneumatic caisson technology. During that time, Daiho Corporation initiated development of an unmanned excavation method using a full-scale remote operation system. For the foundation of the Rainbow Bridge, a double slab was adopted, contributing to improving the ascending/descending work environment and suppressing decompression sickness.

Pneumatic Caisson Technology



Civil Engineering and Construction Projects for Railways and Roads

We undertake bridges, tunnels, and station buildings comprehensively.

Our Projects


Rainwater Storage Facility

Rainwater storage facility for preventing flood damage caused by climate change

In recent years, water-related disasters have frequently occurred nationwide due to local concentrated downpours caused by climate change. As countermeasures against flood damage, the rainwater storage facility, which temporarily stores rainwater, has been attracting more attention than ever. While it has been recognized as a countermeasure against flood damage in urban environments caused by a reduction in the infiltrated rainwater resulting from the advancement of urbanization, since record rainfall is being recorded in recent years there is an urgent need for maintaining rivers around the country. At Daiho Corporation, we are engaged in implementing measures against water-related disasters caused by flooding by constructing storage facilities under rivers using the pneumatic caisson method and shield method capable of performing work at great depths.

Rainwater Storage Facility


Sea Embankment

Sendai Gulf Southern Seashore Restoration Project

The tsunami caused by the Great East Japan Earthquake in March 11, 2011, caused unprecedented damage to the coastal area of the Tohoku region. Daiho Corporation initiated the Sendai Gulf Southern Seashore Restoration Project to restore embankments washed away by the tsunami. On the Sendai Gulf southern seashore (approximately 60km of coast encompassing three cities and two towns from Sendai City in Miyagi Prefecture to the boundary of Fukushima Prefecture), the tsunami engulfed the embankment at all sections and the area suffered enormous damage, such as embankment collapse, wave dissipating blocks being scattered, and the outflow of the slope at the back of the embankment. At Daiho Corporation, we began the emergency restoration work on the embankments encompassing sections of approximately 20 km by August 2011, and completed full-scale restoration by the end of March 2017.

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Institute of Technology

Opening of the center of tradition and advancement of Technology at Daiho Corporation

With the aim of inheriting and evolving Daiho Corporation’s technology, as well as conducting new technology R&D, we established the Institute of Technology inside the Machine and Material Center (Ami-machi, Inashiki-gun, Ibaraki Prefecture) in 2020. The Institute of Technology undertakes technological development in response to the trends of the time and society in an immediate and timely manner, while understanding and analyzing internal and external needs related not only to civil engineering and architecture but also extracting ideas. Technological development is conducted based on the three pillars of deepening the evolution of Daiho Corporation’s strong technology, including pneumatic caisson and mud pressurization shield, new field applications, accepting the challenge of developing new technology, and fusion with IT. Going forward, we will accelerate our technological development by actively collaborating with external parties through open innovation to improve Daiho Corporation's technological capabilities.

Institute of Technology


Medical and Welfare Facilities

Our Projects in Medical and Welfare Facilities

Our Projects


Educational Research and Cultural Facilities

Our Projects in Educational Research and Cultural Facilities

Daiho Corporation undertakes the whole process from consultation on seismic isolation to maintenance.

Our Projects


Residential Housing and Office

Our Projects in Apartments and Office Buildings

In recent years, we have expanded into the condominium business for elderly people in the course of developing new businesses, one of the pillars in our midterm business plan.

Our Projects


Construction of Acclimatization Facility for Japanese Crested Ibis

Construction of acclimatization facility for releasing Japanese crested ibis into the wild

We installed an acclimatization training facility for releasing Japanese crested ibis into the wild, a cooperative project of the Ministry of the Environment and Niigata Prefecture. We built a rearing facility and an administration facility for releasing Japanese crested ibis into the wild and maintained environments, such as feeding sites, dens, and nesting trees, where training is conducted for feeding, building nests, rearing young birds, breeding, flying, and avoiding natural predators so that the birds in captivity can survive independently in nature. Moreover, on the assumption that the Japanese crested ibis may return after release, we are also maintaining the marshes, nesting trees, and trees where they sleep in the surrounding area.For the construction of these facilities, we save chemical building materials as much as possible and use natural materials, reusing trees felled during the construction by producing chips for slopes and paths within the premises on site as part of our environment conservation efforts.

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Dolphin dock construction method for maintaining port and harbor equipment, including breakwater around Japan

The dolphin dock construction method used for constructing underwater structures, including breakwaters, quay walls, seawalls, and power plant water intake, is one of Daiho Corporation’s strong technologies. With this technology, work can be completed by creating a mound underwater, building a concrete structure upon it, and then utilizing the ascending force to move the structure to the predetermined position. Since it is settled at the bottom of the water, it enables work similar to on-ground work. This method is also characterized by a small water area occupied for the work.

Dolphin dock construction method


Logistic Facility

Our Project for a Logistic Facility

Our Projects