Shaft Sinkers
Shaft sinkers can build shafts to a depth of over 1 km. Several shaft sinking machines are specifically built to prepare shafts for tunnel boring machines. These shaft sinkers are widely used by contractors willing to build an 80 meter shaft in about two weeks including two more weeks for equipment mounting. It makes the shaft sinking process faster and more predictable in terms of construction time and quality.
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Used HK shaft sinker avaliable for sale now. Diameter - 9-12 meters (30-39 ft depending on the boom inlination and spacers' position)
Shaft sinker at a job site in St. Petersburg