公开(公告)号：US20240254879A1

公开(公告)日：2024-08-01

申请号：US18424649

申请日：2024-01-26

Applicant: ROBBINS MINING, INC.

Inventor： Bradley Dean Grothen ,  Jay Michael McNeeley ,  Stephen Mitchell Smading

IPC: E21D9/11 ,  E21D9/12

CPC classification number: E21D9/112 ,  E21D9/12

Abstract: A Tunnel Boring Machine (TBM) with a circular cutting profile includes secondary cutterhead components that produce a semicircular-arched tunnel profile for use in underground mining and/or civil construction operations, e.g., for boring in material containing rocks with
Unconfined Compressive Strength (UCS) of up to 200 MPA or stronger. The machine is particularly suited to excavate long access tunnels, mine development drifts, road tunnels, and other types of tunnels that require flat bottom, semicircular-arched profiles. The substantially flat tunnel floor allows immediate and effective use of standard vehicles for material and crew transport as well as other construction and mining activities.