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  Requirement of the advanced technology of the TBM to overcome the major hard points in Metro Line No.4 Phase 1, Egypt

  The Metro Line 4 of phase 1 passes through about 17.0 km underground, it had to choose in the design between a few alternative solutions due to the tight implementation time schedule, the route. The selected solution was to reduce the level of the alignment by excavating and breaking through the two groups of working piles under the main street, which is the official road to the Pyramids without affecting the traffic flow. This paper also deals with the method of cutting the piles without affecting the maneuvering of the TBM; as well as, ensuring a smooth transition of loads from the piles to the segment lining of the tunnel. This paper also shows the details of the best angle of the face of the TBM, the arrangement of the cutting tools, and the diameter of the screw conveyor. In addition, this paper presents the highly developed technique of using two types of the grouting materials to minimize the settlement of the surface of the ground. Furthermore, the project must be completed as soon as possible, thus an advanced technology of (Semi-simultaneous TBM) where high-speed excavation and erecting the segments at the same time is applied. On the other hand, the effect of earthquakes was taken into consideration in the design. The tunnel also passes under the Nile River so high technology is used to maintain the efficiency of the TBM during the excavation for the section passing under the Nile River. Finally, SFRC is applied instead of normal reinforcement in a section of the Tunnel. KEYWORDS: SFRC lining, Semi simulation TBM, Breakthrough piles

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