People who build a dam “Shinmaruyama dam” | 「ODICT」 Obayashi-Dam Innovative Construction Technology | Let’s know about the dam OBAYASHI DAM WORLD

Message from field manager
"The dam will be completed by gathering professional technology"

Civil Engineering Section, Shinmaruyama Dam JV Construction Office

Kimihisa Nagata

Entering my second year at a dam site

I wanted to be involved in dams because I had studied river flooding in graduate school. This wish came true and I was assigned to the Shinmaruyama Dam site soon after joining the company.
At first, there were many things I was unfamiliar with, but as I gained more experience while receiving advice from my seniors, I was able to determine whether I needed to ask them or whether I could handle the situation myself. Within a year and a half of my assignment, I was involved in the construction of an observation facility on the dam site from the start of construction to its completion.
Currently, I am in charge of shaft excavation work. When construction is in full swing, I would love to be involved in the construction of the main dam. New employees rotate their duties, so in the future I will probably be transferred to work sites other than dams. I hope to gain a wide range of experience at sites such as bridges and tunnels, and then return to the dam site someday.

Civil Engineering Section, Shinmaruyama Dam JV Construction Office

Kimihisa Nagata

Mechanical and Electrical Engineer Section, Shinmaruyama Dam JV Construction Office

Tsukasa Nagasaka

Building a Career as a Mechanical and Electrical Engineer at a Civil Engineering Site

I am a second-year Mechanical and Electric employee. The catchphrase for Obayashi's new graduate recruitment was "Let's create something unique in the world," and I decided to join the company because I wanted to be involved in the construction of large structures.
The Mechanical and Electrical Section of the Shinmaruyama Dam consists of four people. We install electrical wiring and water supply and drainage piping on site, maintain the power receiving equipment, and deal with mechanical breakdowns. Unexpected problems often occur on site. We overcome such problems as "how to assemble a crane in a narrow space" by discussing them together.
We do our best to respond to consultations regarding machinery and electricity. I am very grateful to have senior members of the Mechanical and Electrical Section around to give me advice. On my days off, I enjoy fishing and other ways to refresh myself.
At dam sites, a variety of construction work is carried out, including tunneling, pouring concrete, and muddy water treatment. I would like to make use of what I have learned at this site to become a Mechanical and Electrical Engineer who can play an active role in all aspects of civil engineering work, not limited to dam construction.

Mechanical and Electrical Engineer Section, Shinmaruyama Dam JV Construction Office

Tsukasa Nagasaka

General Manager, Yamazaki Construction Co.

Katsutoshi Mine

Steadily with an accurate grasp of the situation

On construction site, it is essential to be considerate of the neighborhood. For example, when using machinery to break stones, we use a bubble silencer ®︎ that covers the tip of the machine with air bubbles to reduce noise. In excavating the foundation of the dam body, we use about 40 dump trucks per day. Since these vehicles also travel on public roads, the location and speed of each vehicle are monitored in real time by an operation management system to ensure safe driving.
Due to the process of the Shinmaruyama Dam, the slope is not excavated from the top, but rather from the bottom or the middle of the slope to the top. If excavator scaffolding is not left in place for excavation of the upper part of the slope, there will be no place for heavy machinery, which could lead to accidents. Therefore, we are working to ensure that the width of the heavy equipment scaffolding remains while simulating the work with an ICT system.
In the normal construction of a new dam, we can drop excavation soil because the river is diverted. However, since the existing Maruyama Dam is in operation during this construction, the river is flowing. This construction also has the difficulty of not being able to drop the soil below. As a company specializing in heavy machine civil engineering, we will overcome each challenge one by one.

General Manager, Yamazaki Construction Co.

Katsutoshi Mine

Miyamoto Gumi Corporation
General Manager, Civil Engineering Department, Nagoya Branch

Takayuki Ishikawa

Efficient and safe construction with the latest technology

One of our duties is to collect aggregate for concrete from the rough stone pile on site. In order for the entire site process to proceed smoothly, it is important to create an environment in which heavy equipment and dump trucks can work without accidents and to transport aggregate without delay. As the site manager, I try to plan in advance to ensure that work proceeds smoothly and to create a work site where communication is easy. In addition, to prevent quality deterioration due to rainfall, I devise excavation methods and implement rainfall countermeasures to improve the quality of aggregate.
From now on, we plan to use "machine guidance and machine control," which allows us to monitor the position of the heavy equipment we are operating, to make our work more efficient in the construction of rough stone piles. More items can be directly controlled within the heavy equipment, which will lead to labor savings and the prevention of accidents due to the separation of people and heavy equipment.The construction of the Shinmaruyama Dam will be a long-term project, so new systems will probably be created in the future. We will continue to challenge the latest technology as much as possible, aiming for safe and efficient construction.

Miyamoto Gumi Corporation
General Manager, Civil Engineering Department, Nagoya Branch

Takayuki Ishikawa

Yoshida Nao Civil Engineering Co.
Shinmaruyama Construction Office General Manager

Ikuo Sato

As a tunnel construction professional

I am responsible for the progress management of the tunnel construction that serves as the waterway for the dam, with 8 hours of construction per day. In order to meet the construction schedule, I make a feasible construction plan, taking into account the possibility that the schedule may be delayed. It is also important to create an accident-free site. Because dam tunnels are used as waterways, they have a smaller cross-sectional area than road tunnels. Since heavy machinery comes and goes in a narrow space, we utilize devices that force heavy machinery to stop when people and heavy machinery are close to each other to prevent accidents.
There is a river near the dam site. To ensure that sewage from the construction does not flow into the river, we always treat the muddy water. There is also a risk that the tunnel construction area will be submerged if a large amount of water is released from the dam due to heavy rain. I have been working at tunnel construction sites for 38 years and have experienced flood damage at past sites. In the event of an emergency, we must evacuate with our lives as the top priority. We will continue to work toward the completion of the tunnel so that it can be finished on schedule without injury or disaster.

Yoshida Nao Civil Engineering Co.
Shinmaruyama Construction Office General Manager

Ikuo Sato

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Obayashi-Dam Innovative Construction Technology