Est. 1840 · Asia Pacific · BuiltWorlds Tech Excellence - Field Solutions
Kajima
3-1 Motoakasaka 1-chome, Minato-kuTokyo, Japan
A⁴CSEL - a GC that automated its own iron. Unmanned rollers, dozers, dumps, and excavators on Japanese dams, run from a room in Minato.
Known valuation
Public · TYO: 1812Public contractor. A4CSEL is in-house.
Tech Excellence - Field Solutions
BuiltWorlds · 2026
Known clients
Publicly named customers on jobs - not a complete list.
- MLIT Naruse Dam
- Japan Water Agency (Koishiwara Dam)
- NEXCO Shin-Meishin
- JTC (Bulim Autonomous Yard)
Works with
OEMs, platforms, accelerators.
- Gravis Robotics
- Kok Tong Construction
- Tractors Singapore
Awards
BuiltWorlds · 2026
Tech Excellence - Field Solutions
Contractor digital-leader award. Kajima - Japanese tools, global platforms, and in-house field stack above benchmark.
Kajima
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Dispatch
2026-09
JTC + Kajima: Singapore’s first autonomous heavy iron pilot
Bulim Autonomous Yard. A⁴CSEL compactors. Gravis-retrofit excavators. One operator on two machines. Bulldozers and dump trucks in 2027 if it holds.
2026-05
A⁴CSEL unmanned iron still placing CSG and compacting Shin-Meishin fill
A GC that automated its own fleet. The IT pilot is in Minato.
