Kumagai Gumi in 5 MinutesHere we will explain Kumagai Gumi.

Remote explosive loading system

Explosives are used for rock excavation in mountain tunnels. The task that is the easiest for accidents to occur is explosive loading work, in which employees must work near dangerous working faces. For the past 15 years, Kumagai Gumi has continued the development of technology that automates loading work and makes it possible for employees to work away from the face. Currently, workers can load the necessary amount of explosives and stemming material merely by pressing a button on a wireless control box. This has made it possible to ensure safety in regard to working face falling by using a loading hose and conducting the work away from the face.

Hokuriku Shinkansen Iiyama Tunnel

One of the most dangerous working conditions in mountain tunnels is swelling ground pressure. Kumagai Gumi was the first company in Japan to adopt NATM, the current standard method of tunnel construction. As the culmination of the technology Kumagai Gumi has cultivated, we established the "multiplied tunnel support system" for the Iiyama Tunnel. Rather than suppressing ground deformation with a strong support structure, the enormous ground pressure is combatted with multiple, relatively small support structures, with tolerance adjusted while predicting the deformation, making it possible to control ground deformation up to 100 cm.

PEAS TOWER: Kumagai Gumi's next-generation super high-rise residential building

This is a super high-rise residence system that utilizes a high-performance, high-flexibility construction (mega-flex construction) to provide a safe, secure, higher-quality living space and interior comfort with an extremely short construction period. The PEAS TOWER system utilizes a high-performance, high-flexibility construction (mega-flex construction) which makes it possible to achieve the following in a reasonable manner.

1. 1) Degree of freedom in the plan
2. 2) Improved view, improved sense of openness (ventilation, allowing light in, etc.) in voids
3. 3) Solid construction that boasts safety and peace of mind
4. 4) Improved room sound insulation
5. 5) Improved equipment updating through complete SI separation
6. 6) Achievement of ultra-short-term work
7. 7) Reduction of the environmental burden and running costs by streamlining on-site work and reducing equipment

Hills Walk Tokushige Gardens

"Hills Walk Tokushige Gardens" is a large commercial facility constructed in the upper part of Tokushige station which is the terminal station of the Nagoya municipal subway Sakuradori line.
It consists of two buildings, "Hills Building" the core facilities and "Gardens Building" which is a joint development of Nagoya City. It is environmentally friendly facility such as rooftop greening and wall photovoltaic power generation equipment.

Building Overview

Wind environment visualization technology utilizing virtual reality (VR)

This employs a combination of fluid analysis and VR technology to make it possible to see the flow of invisible three-dimensional wind in a VR space. Compared to the conventional two-dimensional information, causes of building wind can be identified easily and accurately, so it has garnered high expectations as a tool to improve design quality and living environment performance, and call attention to the prevention of accidents caused by strong wind.

Iizaka Clean Site (Fukushima Prefecture)

The Tohoku Region's most prominent hot spring, the Fukushima Prefecture managed final disposal site "Iizaka Clean Site," fulfills a vital role in protecting the environment as Tohoku's only model facility, and plays a part in the venous industry. A multipurpose hall and a tour course have been established at the Iizaka Clean Site as a place for training in thinking of environmental issues as something close to home. Many people visit the facility, including children on social studies field trips, neighborhood associations, industrial and environmental groups, observers from overseas, etc.

Kumagai Gumi's one-stop solutions

Kumagai Gumi gathers the essence of expertise and technology from throughout the Group, and works as the customer's partner to provide assistance at each stage of the entire process, including operation, maintenance, repair, and reclamation, even after the building has been completed.

For example, customers can continue to use a building well, while controlling expenses after the building has been completed, through a long-term repair and maintenance plan and periodic investigations, or maintain or improve the building's value and utilize it effectively, through repair, maintenance, updating, renewal, or renovation proposals.

Long-term repair and maintenance plans make it possible to foresee the timing of appropriate repairs, maintenance, and updating work, and thereby maintain the building appropriately.

Inagi City Chuo Library and Shiroyama Experience and Learning Museum
-- First library operated as a PFI in eastern Japan --

The Inagi City Chuo Library and Shiroyama Experience and Learning Museum is an experiential compound library unlike any before, that provides a place for interaction between humans and nature as a regional information site. Kumagai Gumi participated in the project and handled construction as the first PFI library for design, construction, operation, and management in eastern Japan.

Mexican stonecrops have been planted on the roof (rooftop greenery) of the Experience and Learning Museum that leads to the library via a connecting passage, reducing reflection of the sun and the transfer of heat into the building. Adjustments have been made to harmonize with the environment and utilize nature, such as reusing rain water as intermediate water.

Building Overview

Antiseismic wrap method

This is an earthquake-resistant reinforcement method that assembles the steel plate cut to corrugated shapes around an existing concrete column, with the gap between the column and the earthquake-resistant lap steel plate filled with mortar to improve the shear failure and toughness of the concrete column. It is characterized by being able to be manually constructed and being on-site non-welded, etc. Since the 2006 issuing of "Seismic Retrofit Design and Construction Guidelines for Existing Railway Concrete Elevated Track Column Reinforced Waveform Divided Steel Plate Wrap Reinforced Edition" (Railway Technical Research Institute), more than 300 columns have been applied to earthquake-resistant reinforcement. In 2017, in order to respond to the demand for subway middle columns, we expanded the scope of application to accommodate wide and high-axial force columns that have been out of the scope of application.

Aso Ohashi Bridge Area Slope Disaster Prevention Construction (Kumamoto Prefecture)

Large-scale slope damage occurred in the Aso Ohashi Bridge area as a result of the Kumamoto Earthquake on April 16, 2016, and National Road 57, JR Hohi Main Line, and Aso Ohashi Bridge connected to National Road 57 (National Road 325) located at the bottom of the slope were washed away. In response to the risk of further collapse due to falling rain and aftershocks, etc., the latest unmanned construction technology, i-Construction, was incorporated in an integrated manner to conduct safe and quick work, and an unprecedented emergency disaster response was achieved as a result.