TAIL SEAL COMPOSITION OF SHIELD EXCAVATOR

PURPOSE:To effectively cut off underground water penetration from the tail seal section of an excavator by setting the content of base oil, talc and fiber as a specific wt.%. CONSTITUTION:Talc 20-60wt.%, synthetic fiber having 1-15mm in length and/or natural fiber 0.5-10wt.% and synthetic fiber havi...

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Bibliographic Details
Main Authors MISHIMA MASARU, KINOSHITA HIROSHI, NOMURA SOICHI
Format Patent
LanguageEnglish
Published 29.08.1991
Subjects
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
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Summary:PURPOSE:To effectively cut off underground water penetration from the tail seal section of an excavator by setting the content of base oil, talc and fiber as a specific wt.%. CONSTITUTION:Talc 20-60wt.%, synthetic fiber having 1-15mm in length and/or natural fiber 0.5-10wt.% and synthetic fiber having the fiber length less than 1mm and/or natural fiber 0.5-10wt.% are mixed with base oil or grease to make a tail seal composition. A wirebrush and wire net are textured closely to promote the cutting-off operation under high water pressure.
Bibliography:Application Number: JP19890336883