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Development of trenchless underground crossing method
Displacement limitation response type during shallow section excavation in urban areas
Final goals of Research & Development
[Final goal] Development of trenchless underground crossing method that can reduce construction cost through improvement of construction speed of excavation work for installation of lower transverse structures in urban shallow (3.5m or less) section
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1
Detailed goal. 1
Evaluation technique of settlement characteristics for relaxation area during excavation of shallow section
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2
Detailed goal. 2
Development of trenchless underground crossing method that can ease excavation ground and inhibit initial settlement of excavation upper ground
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3
Detailed goal. 3
Performance Evaluation and Effect Analysis of Development Method by Field Test Construction
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4
Detailed goal. 4
Development of design and construction standard for developed underground crossing method
Quantification of R & D goals
1) Reduced displacement (relaxation area) by 20% compared to medium-large diameter steel pipe through combination of “Improvement application such as Steel pipe multistage grouting· Fore poling - -SEM pile” and “Front pressurized enclosure”
2) Improvement of construction speed by 20% during traction and propulsion of enclosure by "application of friction reducing device"
3) Reduction of construction cost due to construction period shortening by 20%
Development of next generation Super Equilibrium Method (SEM)
※ Development of the underground crossing method which can suppress the upper deformation while maintaining the stress balance in the ground
Quantification of R & D performance goals
Research and Development System
Research and Development work area
※ Development of displacement limitation responding type trenchless underground crossing method during excavation of shallow section in urban area
Improvements compared to existing methods
Research result utilization plan
※ Ensure SEM method and stability of adjacent ground to fundamentally prevent settlement and loosening of upper ground
1. Securing traffic safety through 3D (underground) of main traffic facilities intersection
2. Flexible response to urban road network expansion plan
3. Used as basic data of various excavation sites to establish a preliminary plan to secure the ground stability
[Technical expected effects]
- Securing the crossing method technology using small diameter steel pipe and friction reduction technology
- Securing facilities and user risk assessment techniques
- Development of technologies to ensure additional stability in secondary damage and unexpected construction conditions
Creation of a new market and export of technologies centered on developing countries by securing world-class steel pipe press-fit design and construction technology
[Economic and social expected effects]
- Reduction of direct repair cost and indirect social cost due to reduction of underground safety accidents in downtown area
- Relief of the anxiety of citizens, improvement of credibility, and reduction of human and property damage due to man-made disaster
[Environmental expected effect]
Reduced steel consumption by 36% and reduction in carbon dioxide by 24% by using small-diameter steel pipes