Shield Tunneling Technology

Aiming for the leading edge of Shield Tunnel Technology
Fifty years have passed since Obayashi Corporation started to engage in shield tunnel construction and the closed-type shield tunneling method, which is indispensable for shield tunnel construction, was introduced to Japan. The shield tunnel construction technology has improved dramatically in those years. Based on the achievements and experience of more than 600 projects in Japan and abroad, Obayashi Corporation is committed to the research and development of new technologies, integrating the skills and experience of its predecessors.

Special Shield

Excavation Technology

Lining Technology

Peripheral Technology

Automated shield tunnel surveying system OGENTS/SURVEY™ (OGENTS/SURVEY)

Automated shield tunnel surveying systemOGENTS/SURVEY™
(OGENTS/SURVEY)

Automation of tunnel surveying improves productivity.

Self-alignment control system of Shield Machine by AI, Component Technology of OGENTS/DRIVE Self-alignment control system of the shield with AI

Self-alignment control system of Shield Machine by AI, Component Technology of OGENTS/DRIVE Self-alignment control system of the shield with AI

Enables tunneling along the planned alignment regardless of the operator's skill

Three-dimensional alignment control with 3D model, the basic system of OGENTS/DRIVE™  Shield 3D alignment control system

Key technology of shield automatic operation system OGENTS/DRIVE™ Shield 3D alignment control system

The quality of shield tunnels by three-dimensional alignment control using 3D models is improved.

Ensure assembly accuracy with real-time measurement management Segment roundness measuring device

Shield tunneling management Segment roundness measuring device

The quality of the segment ring is improved.

Manage cutter wear from inside the machine Roller cutter wear detection device

Machine maintenance Roller cutter wear detection device

Prevents process delay by controlling cutter wear

Prevents damage to cutter bearing seal by foreign matters for proper functioning Grease line foreign matter inclusion monitoring device

Shield tunneling management technology Grease line foreign matter inclusion monitoring device

Damage to soil seal by entering foreign matters is prevented, and its soundness is maintained.

Watertight tail seal for improved segment quality SEALNOC CR

Tail Seal Grease SEALNOC CR

Segment quality is improved with the high water tightness of the tail seal.

Biodegradable tail seal grease with high water sealing and pumping performance SEALNOC BD

Environmentally friendly grease material for shield machines SEALNOC BD

Biodegradable tail seal grease with high water sealing and pumping performance

Backfill grouting material that does not obstruct groundwater flow Permeable backfill grouting material

Permeable backfill grouting material Permeable backfill grouting material

Prevents breakup of groundwater flow during shield tunneling

R-CUBIC® soil cleansing system (Reduce、Reuse、Recycle) Iron powder cleansing

Soil contamination countermeasure Iron powder cleansing

R-CUBIC® soil cleansing system (Reduce, Reuse, Recycle) removes contaminated soil (dehydrated cake) consisting of fine-grain soil and collects purified soil (coarse-grained soil).

Insolubilization Method: HISOGUARD®

Soil contamination countermeasure HISOGUARD®

Chemicals are stirred and mixed according to the contamination condition and are insolubilized (insolubilization method).For arsenic-contaminated soil, there is also a technology that makes it possible to insolubilize, ensuring ground strength and maintaining pH neutrality in a single process is possible. (HISOGUARD®).

Restraining ground deformation in non-open-cut method with small overburden Geo-Flex Beam®

Restrain of ground deformation Geo-Flex Beam®

Ground deformation is restrained in shield construction with small overburden.

Relay conveyor is eliminated during U-turn construction.  U-turn type continuous belt conveyor

Muck removal in shield tunneling U-turn type continuous belt conveyor

The belt twisting device eliminates the need for a relay conveyor.

It reduces the vibration of shield machine tunneling and its negative influence on the surrounding environment.  Yurena Shield™ (Less shaking Shield Machine)

Active vibration control system for shield machines Yurena Shield™ (Less shaking Shield Machine)

It reduces the vibration of shield machine tunneling and its negative influence on the surrounding environment.