Technology Overview
On February 19, 2026, Taisei Corporation announced the development of a groundbreaking “Charging Unit” designed to achieve the full mechanization of blasting operations in mountain tunnel construction. By integrating this unit with the “T-Quick Shot” explosive charging device and wireless electronic detonators, a single operator can now manage the entire sequence—from drilling to explosive charging—directly from the cockpit of a drill jumbo. This innovation eliminates the need for personnel to enter the high-risk area near the tunnel face, significantly enhancing both safety and productivity. The unit is designed for easy retrofitting onto existing machinery, facilitating rapid deployment across various construction sites without extensive modifications. This technology represents a pivotal step in Taisei’s “Construction Process DX” strategy, aiming for ultimate labor reduction and safety in hazardous environments.
Original News Release: https://www.taisei.co.jp/about_us/wn/2026/260219_10933.html
Background
Mountain tunnel construction has traditionally relied on cyclical blasting operations that require workers to perform tasks in close proximity to the “tunnel face,” the most hazardous zone in any underground project. The primary risk is “skin falls”—the spontaneous collapse of rocks and soil from the freshly excavated surface—which poses a constant threat of fatal accidents. Despite advancements in mechanized drilling, the subsequent steps of loading explosives and connecting detonator wires have remained largely manual and labor-intensive. Furthermore, the efficiency of these manual tasks varies significantly based on the skill and physical condition of the workers, leading to inconsistent construction cycles. As the construction industry faces a shrinking pool of skilled labor and increasing demands for occupational health and safety, there has been an urgent global need to remove human workers from the tunnel face and standardize the excavation process through automation.
Advantages
The Charging Unit transforms blasting from a high-risk manual labor task into a streamlined, automated process. It ensures worker safety by enabling remote operation and stabilizes the construction schedule by eliminating human-induced variability.
| Feature | Conventional Method | Taisei’s Charging Unit |
|---|---|---|
| Safety | High risk (Manual work at tunnel face) | Maximum safety (Operator in protected cockpit) |
| Staffing | Multiple skilled charging workers | Single machine operator |
| Wiring | Manual physical wiring required | Wireless electronic detonators (None) |
| Cycle Time | Variable based on worker fatigue/skill | Standardized and optimized by data |
Potential Applications
This technology is expected to become the industry standard for tunnel projects where geological instability or extreme depths make manual labor prohibitive. Future developments will focus on integrating AI-driven geological analysis to automate explosive quantity adjustments in real-time. By connecting this unit with automated surveying systems, the industry can move toward “unmanned” tunnel faces, drastically reducing overhead and project timelines. Additionally, the precision of automated charging minimizes over-excavation, leading to more sustainable infrastructure development by reducing concrete waste and energy consumption globally.
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