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Home > R & D and Technologies > Paper > NON-CIRCULAR SHIELD TUNNEL METHOD
RECENT TECHNOLOGIES OF TBM(SHIELD) & PNEUMATIC CAISSON
1. NON-CIRCULAR SHIELD TUNNEL METHOD
The Shield tunnel method is classified as shown on the Figure-1. DK, DOT and DPLEX are classified into Muddy soil pressure type. The DOT and DPLEX shield methods were developed on the base of technology for DK shield machine, where the spoke type of cutter was found to be quite suitable for the stability of the cutting face. Utilizing this spoke type of cutters it became possible to arrange and combine two ordinary cutters at an equi-plane face so as to bore a compound circular cross section in the DOT method. Another tunnel method involved a cutter frame supported by the several crank arms, which was designed and applied drastically for a non- circular cross section in the DPLEX method. The outline and technology of the Non-circular shield tunnel methods are stated as follows.

Figure-1 Classification of the types of shield machine
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