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A platform for research: civil engineering, architecture and urbanism
Application of umbrella arch in the Kargi project
The aim of this chapter is to introduce one of the most comprehensive and successful umbrella arch (UA) operations used ahead of a TBM in the Kargi tunnel in blocky ground and complex geology in Turkey. The increase of TBM torque and the change in penetration rate of the probe drill were used as criteria for the application of UA. The umbrella arch is a very useful technique to prevent the jamming of the TBM cutterhead in blocky ground, as proved on the Kargi project, but it is important to note that some basic criteria should be established for using this technique. A map showing the contours of changing probe drilling rates and change of torque values were used as the two basic criteria in the Kargi project. The increase of TBM torque up to a certain limit can be used as a critical torque value for using UA. This was established as 42,000 kNm in the Kargi project.
The umbrella arch was applied nine times in the Kargi project. As the crew gained experience, time for drilling and injection was reduced from five days to two. However, it should be said that the UA is a good alternative to excavating bypass tunnels for releasing a blocked cutterhead.
Application of umbrella arch in the Kargi project
The aim of this chapter is to introduce one of the most comprehensive and successful umbrella arch (UA) operations used ahead of a TBM in the Kargi tunnel in blocky ground and complex geology in Turkey. The increase of TBM torque and the change in penetration rate of the probe drill were used as criteria for the application of UA. The umbrella arch is a very useful technique to prevent the jamming of the TBM cutterhead in blocky ground, as proved on the Kargi project, but it is important to note that some basic criteria should be established for using this technique. A map showing the contours of changing probe drilling rates and change of torque values were used as the two basic criteria in the Kargi project. The increase of TBM torque up to a certain limit can be used as a critical torque value for using UA. This was established as 42,000 kNm in the Kargi project.
The umbrella arch was applied nine times in the Kargi project. As the crew gained experience, time for drilling and injection was reduced from five days to two. However, it should be said that the UA is a good alternative to excavating bypass tunnels for releasing a blocked cutterhead.
Application of umbrella arch in the Kargi project
Bilgin, Nuh (author) / Copur, Hanifi (author) / Balci, Cemal (author)
2016-10-28
12 pages
Article/Chapter (Book)
Electronic Resource
English
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