OPEN SHIELD CONSTRUCTION METHOD

PROBLEM TO BE SOLVED: To provide an open shield construction method, which prevents outflow of a primary backfill material and can avoid increase in the thickness of a secondary backfill material.SOLUTION: An open shield construction method is used to sequentially bury concrete caissons 4 in single...

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Bibliographic Details
Main Authors UEMURA KENJIRO, UEMURA MAKOTO, TAKEGAWA HIROAKI
Format Patent
LanguageEnglish
Published 21.02.2013
Subjects
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
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Summary:PROBLEM TO BE SOLVED: To provide an open shield construction method, which prevents outflow of a primary backfill material and can avoid increase in the thickness of a secondary backfill material.SOLUTION: An open shield construction method is used to sequentially bury concrete caissons 4 in single file by repeating steps as necessary including: a step to excavate and remove the forward soil at the front face or the upper surface opening of an open shield machine 1; a step to advance the shield machine by utilizing a concrete caisson 4 for the reaction force; and a step to lift down a new concrete caisson 4 from the upper position and set it to a tail part behind shortened shield jacks located in the jack part of the shield machine. In the aforesaid step of setting the concrete caissons 4, where a primary backfill material 6 is packed into a gap between the outer side of the concrete caisson 4 and the tail part after setting the concrete caisson 4, an outflow-prevention part member 15 meant for the primary backfill material 6 is installed at the front end position of the installed concrete caisson 4 in the location for packing the aforesaid primary backfill material 6, and the primary backfill material 6 is prevented from flowing out.
Bibliography:Application Number: JP20110172683