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Fortaleza Metro.
East Line 3

Location: Fortaleza - Sao Paulo (Brazil)
Date: 2012-2013
Client: Robbibns Company
Four 6.92 m (22.7 ft) mixed ground Robbins Earth Pressure Balance Machines (EPBs) will excavate for one of Brazil's largest tunnel projects, Line 3 of the Metro Fortaleza. Line 3 will connect souteastern areas of Fortaleza with the downtown, and transport thousands of daily passengers. The machines will excavate sections of tunnel ranging from 4.3 km (2.7 mi) to 5.8 km (3.6 mi).

The four EPBs are designed for Brazil's complex geology with mixed ground cutterheads and additive injection capabilities. Each machine will also be equipped with Robbins continuous conveyor systems for efficient muck removal.

Ingemey's work in the project involved the geometric definition of the segment and design and calculation of the thrust structure.

The following summarizes the characteristics of the ring.

Ø external
6.60 m
Ø internal
6.00 m
Segment thickness
30 cm
Average length
1.5 m
Ring's segments
5 + 1
Key Segment
Dovela tipo
Regular Segment
15.000 kN