A tunnel excavation device includes a front body portion configured to support a cutter head and a rear body portion. The rear body portion includes a gripper carrier and a gripper portion. The gripper carrier is disposed in a rear of the front body portion. The gripper portion is provided on the gripper carrier. The gripper portion includes a groove portion and a wheel portion. The groove portion is formed in a recess shape toward the rear main body. The wheel portion is disposed in the groove portion.

A rotary digging drill includes three disk drills arranged in ascending order of diameter, each with a cavity therein. The disk drill includes two circular ring seats arranged side by side, multiple toothed digging buckets disposed at peripheries of the two circular ring seats, and ring gear racks respectively disposed on inner sides of the two circular ring seats. Adjacent ones of the disk drills have the toothed digging buckets facing opposite directions, and the disk drills all rotate in a direction facing a large opening, enabling adjacent two of the three disk drills to rotate in opposite directions. The rotary digging drill further includes three disk drill supports that match the three disk drills in quantity and are configured to support and drive the three disk drills.

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.

The present invention discloses a right-angle turning method for small-diameter TBM exploration adit excavation and belongs to the field of geological exploration of water conservancy and hydropower projects. The method includes the steps: excavating a main exploration adit with a small-diameter TBM to a designated position, and then enabling the small-diameter TBM to continue to excavate forward to a temporary parking place, and parking the small-diameter TBM there; expanding and excavating a turning workspace at a right-angle turning position, and assembling a rotary platform; pulling the TBM onto the rotary platform, then starting excavation after rotating the rotary platform to make the TBM move in a same direction as the branch exploration adit; and pulling the TBM onto the rotary platform after excavation of the branch exploration adit is completed, and then moving the TBM to an adit portal so as to complete excavation after rotating the rotary platform to make the TBM move in a same direction as the main exploration adit. The present invention effectively solves the problems that the small-diameter TBM can only excavate main exploration adits in geological exploration adits of underground powerhouses of hydropower projects and pumped storage projects, and cannot make right-angle turns and excavate branch adits of underground cavern groups. It effectively fills the blank of a traditional adit excavation adopting blasting technology; and the excavation efficiency is high, the working environment is friendly, and safety production is guaranteed.

A cutter head for excavating hard rock materials in rock face includes a carrier attachable to a cutter arm of a cutter machine and a drive shaft rotatably supported by the carrier. The drive shaft is rotatable about a drive axis and has at one end a support portion for mounting disc cutters. A plurality of disc cutters are mounted on the support portion and configured to perform undercutting against the rock face. Each disc cutter is rotatable about a respective support axis, the respective rotational axis of each disc cutter being configured to be substantially transverse to the rotational axis of the cutter head. A mining machine including the cutter head is also disclosed.