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Technologies and InnovationCivil Engineering TechnologyT-type Basement Branch off Shield System Method
T-type Basement Branch off Shield System Method
This process makes it possible to mechanically connect a new tunnel to a lateral side of an existing tunnel without building a shaft. A drilling-reinforcing ring housed in a shield machine directly grinds and penetrates into the existing tunnel and mechanically connects the new tunnel to it. This process conducts lateral side-connecting work underground in a safe, reliable manner, even under high ground water pressure conditions.
In applying this process, a “W” method, in which the drilling-reinforcing ring has a double structure, or an “S” method, in which it has a single structure, can be chosen, depending on specific jointing needs, thereby making the T-Boss method suitable for a wide range of applications.
Features
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Jointing points can be freely selected. A cutting bit is applied to both steel and RC segments. Equipped with a device to reinforce an opening section, the drilling-reinforcing ring enables operators to choose any jointing point without advance preparation.
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Time needed for ground improvement is greatly reduced.
- A drilling-reinforcing ring equipped with earth-retaining and water-shutoff functions helps reduce the need for ground improvement substantially. A larger-scale junction under higher water pressure reduces cost.
- Shorter construction periods with more cost reduction
- The mechanical connection of a drilling-reinforcing ring enhances safety and efficiency, thereby resulting in shorter construction periods and lower construction costs.
