Jacques Triger

Jacques Triger was an engineer Géologue French 19th century, officer of the Légion of honor.

It was born with Mamers (the Sarthe) in 1801 and died in Paris in 1867, at a meeting of the Geological Company of France. Its name is registered on the Eiffel Tower.

Mining technique

To exploit coal benches in wet mines located in aquiferous zones --- for which the pumping of water of Exhaure was insufficient --- he had imagined the “Procédé Triger” which consisted in sending Compressed air in the mine, to maintain water at the bottom of the well. The workmen penetrated there by a hopper, by which also rubble left. (This was extremely dangerous at one time when the behavior of the human organism in hyperbare medium was unknown -- many people found death or were seriously broken because of accidents of decompression during the construction of bridge of Brooklyn, to 35 m of depth).

The process was used for the construction of the piles of bridges, like the Pont of Kehl, and sinking in aquiferous zone. It was also used by Gustave Eiffel in 1887 to build the foundations of two of the four piles of its tower, which were located in an old arm of the Seine. Nowadays, sinking and the digging with the Tunneller with room hyperbare, ultimate evolution of the Triger process, make it possible to cross insuperable zones with the traditional means.

In 1838, Jacques Triger introduced the metal lining of the mine shafts.

Triger was also a geologist of reputation, which drew the first geological map of the the Sarthe. He was also paleontologist, belonging to the first team to excavate the archeological site of Rock-in-Straw ( the Chalonnes-on-Loire , Maine-et-Loire). Its very large collection of rocks, fossils and minerals is visible with the Natural history museum of Natural history of Angers.

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