Non-Open Cut Construction
Non-Open Cut Construction
Non-Open Cut Construction
Non-Open Cut Construction Method
- Non-Open Cut Construction Method is for the tunnel or under ground structures. At first, inject the steel pile by pressure and excavate the inside of structure to set up the underground structure needed. It is mainly used for ensuring stability of previously constructed structures and underground facilities and reducing traffic hazard of construction area.
Non-Open Cut Construction Method Comparison
| Type | T.R.c.M (Tubular Roof construction Method) |
N.T.R (New Tubular Roof Method) |
U.P.R.S (Upgrade Pipe Roof Structure) |
Front Jacking |
|---|---|---|---|---|
| Outline |  |
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| Definition | After excavating inside of steel pile, as a permanent and temporary structure, build a slab and make a wall by trench excavation | After Injecting large diameter steel pile by pressure, set up steel structure in the steel pile and pour concrete.And excavate soil inside of structure | At first, inject steel pile on upper side and both sides of designed section, and pour concrete. After setting the temporary support in horizon & vertical steel pile, excavate inside and set the support. | Make a pipe roof by injecting the steel pile in road bed and tow the full-face precast concrete made on-site to the specific location |
| Features |
- It’s possible when the radius curvature is over 200m - No limits in length of structure - Only need 1.0m as a minimum depth - Good at improving vertical alignment - Don’t need any other support when excavate inside of structure - Only need small work place |
- Good quality(by using steel piles as forms) - No limits in horizon alignment - No limits in length of structure - Only need 1.0m as a minimum depth - Good at improving vertical alignment - Don’t need water proofing(by maintaining the steel pile on the outside) - Only need small work place |
- No relaxation in the soil(by using small steel pile) - It’s possible when the radius curvature is over 800m - Good when the length is shorter than 30m - Only need small work place |
- Good quality (Manufactured at casting yard) - It’s possible when the radius curvature is over 800m |
Main Work Process Comparison (T.R.c.M/N.T.R)
| T.R.c.M Railway construction on zone 5 (Ori~Suwon) |
N.T.R Railway construction on zone 3 (Ori~Suwon) |
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|---|---|---|---|
| 1.Setting the Abutment test wall and inject the steel pile by pressure (gallery pile) | 2. Inject the steel pile by pressure(slab pile) | 1. Set the Abutment test wall and inject the steel pile by pressure | 2. Inject the steel pile by pressure |
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| 3. Pour concrete(slab pile) | 4. After excavating the wall, pour concrete | 3. Joint the steel pile | 4. Set the prevention against earth pressure |
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| 5. Pour concrete (gallery pile) | 6. Excavate the beginning point | 5. Set th form in the steel pile | 6. Pour concrete in the steel pile |
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| 7. Excavate inside | 8. Completion | 7. Excavate inside | 8. Completion |
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