Tnel Emisor Poniente II –Mechanized Excavation

To the west of Mexico City, in the State of Mexico, a key component in a massive wastewater overhaul is underway. A 5.8 km tunnel project, known as Tnel Emisor Poniente (TEP) II, will supplement an existing wastewater line built in the 1970s and is part of a solution to a serious groundwater problem in the area.

The Valley of Mexico consists of a drained clay lake bed interspersed with volcanic rock and boulders from long dormant, buried volcanoes. Chronic groundwater depletion has resulted in soils that sink as much as 20 cm per year. All that sinking – amounting to as much as 10 m in the last century – has caused the city’s wastewater tunnels to lose their slope. The result is a recipe for massive flooding, and localized flooding each year during the rainy season.

Tnel Emisor Oriente and TEP II – Massive Endeavors to solve Groundwater Problems

TEP II is slated to overhaul the western areas outside of...

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Issue 2012-02

Túnel Emisor Oriente: The biggest Sewage Project in the World

1 The sinking City In the past 100 years some parts of Mexico City have sunk by roughly 12 m – corresponding to the height of a 4-storey high house. The bulk of the city is constructed on swampy...

Issue 2014-02

Dry Ground for Mexico’s Capital: Half the Tunneling-Work is done

The drainage system of the metropolitan region is no longer sufficient to maintain an adequate water discharge, especially due to the increasingly unfavourable gradient of the Emisor Central...

Issue 2010-08 The Robbins Company

Lok Home: We have regained our position as a leading supplier

In February, 2010, the Robbins Company invited to Corpus Christi, Texas/USA, to join the launch and assembly of three EPBs for the Emisor Oriente Project in Mexico City. During the ceremony we asked...

Issue 2011-02 Switzerland

Breakthrough at Weinberg Tunnel in Zurich

The Weinberg Tunnel in Zurich, part of Swiss Federal Railways’ “Diameter Line Project”, was successfully broken through on 22nd November 2010. After boring a total of 4,382 m the convertible TBM...

Issue 2019-02 Turkey

TBM-Excavation of Turkey’s longest Water Tunnel

Excavation of Turkey’s longest water tunnel came to an end in December 2018. To get there, a 5.56 m diameter Robbins Crossover (XRE) TBM and the contractor JV of Kolin/Limak had to overcome dozens of...