E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 9/06 (2006.01) C09K 8/38 (2006.01) E21D 9/10 (2006.01)
Patent
CA 2498202
A method of reducing wear in a cutting head of a tunnel boring machine, by means of the addition at the cutting head of a foamed aqueous liquid composition, which comprises a foaming agent and a lubricant, the lubricant being selected from the group consisting of high molecular weight polyethylene oxides and bentonite. Preferred foaming agents are anionic and nonionic surfactants. Wear rates of cutting elements of TBMs boring in hard rock are considerably reduced. A wear-reducing foamable concentrate is also described.
L'invention concerne un procédé permettant de réduire l'usure dans une tête de coupe d'un tunnelier par ajout, au niveau de la tête de coupe, d'une composition mousseuse, aqueuse et liquide renfermant un agent moussant et un lubrifiant sélectionné dans le groupe comprenant des oxydes de polyéthylène de poids moléculaire élevé et de la bentonite. Des agents moussants préférés sont des tensioactifs anioniques et non ioniques. Les taux d'usure des éléments de coupe des tunneliers creusant dans la roche dure sont nettement réduits. L'invention concerne également un concentré mousseux réduisant l'usure.
Egli Herbert
Ellenberger Peter
Construction Research & Technology Gmbh
Gowling Lafleur Henderson Llp
LandOfFree
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