A cutting device for engaging a rock face includes a disc body supported for rotation about an axis of rotation, and a plurality of peripheral portions removably secured to the disc body. Each of the peripheral portions including a plurality of cutting bits positioned on a peripheral edge. The peripheral edge of each peripheral portion is aligned with the peripheral edges of adjacent peripheral portions.

A cutting device for engaging a rock face includes a disc body supported for rotation about an axis of rotation, and a plurality of peripheral portions removably secured to the disc body. Each of the peripheral portions including a plurality of cutting bits positioned on a peripheral edge. The peripheral edge of each peripheral portion is aligned with the peripheral edges of adjacent peripheral portions.

A cutting device for engaging a rock face includes a disc body supported for rotation about an axis of rotation, and a plurality of peripheral portions removably secured to the disc body. Each of the peripheral portions including a plurality of cutting bits positioned on a peripheral edge. The peripheral edge of each peripheral portion is aligned with the peripheral edges of adjacent peripheral portions.

A cutting device for engaging a rock face includes a disc body supported for rotation about an axis of rotation, and a plurality of peripheral portions removably secured to the disc body. Each of the peripheral portions including a plurality of cutting bits positioned on a peripheral edge. The peripheral edge of each peripheral portion is aligned with the peripheral edges of adjacent peripheral portions.

A foundation construction device for use in a construction device of a foundation (4) provided with a chain cutters (3) at the bottom during construction, comprising a fixed guiding device (1) and a composite device (2). The fixed guiding device (1) is composed of a fixed rack (1-1) and a guiding device (1-2). The composite device (2) comprises a chain cutter power transmission device (2-1), a spoil treatment device (2-2), and a rack (2-3). Also disclosed is a construction method for the foundation construction device.

A foundation construction device for use in a construction device of a foundation (4) provided with a chain cutters (3) at the bottom during construction, comprising a fixed guiding device (1) and a composite device (2). The fixed guiding device (1) is composed of a fixed rack (1-1) and a guiding device (1-2). The composite device (2) comprises a chain cutter power transmission device (2-1), a spoil treatment device (2-2), and a rack (2-3). Also disclosed is a construction method for the foundation construction device.

Various embodiments include methods and apparatus structured to increase efficiencies of a drilling operation. A drilling apparatus can be structured to include a hammer drill to move a hammer to impart impact force to a bit box in conjunction with a rotary drive shaft. The hammer drill can be arranged as a mechanical drive hammer capable of being applied to both fluid drilling and air drilling. Additional apparatus, systems, and methods are disclosed.

A device for coupling to a working end of a hydrovac boom hose includes a tubular suction tube for removably coupling to the working end of the hydrovac boom hose such that an opening of the working end remains unobstructed. A plurality of high pressure turbo nozzles configured for emitting high pressure water are located around a circumference of the tubular suction tube such that the turbo nozzles surround the working end of the hydrovac boom hose to dislodge earthly materials under the device. An outer housing to enclose and protect the tubular suction tube, turbo nozzles, and onboard locating device, and to provide an air duct for ambient air to pass down threw. A plurality of air vents in the outer housing that provide flow of ambient air to an area being excavated. The conduit coupled with the outer housing, for allowing ingress of water to the plurality of high pressure turbo nozzles.

A device for coupling to a working end of a hydrovac boom hose includes a tubular suction tube for removably coupling to the working end of the hydrovac boom hose such that an opening of the working end remains unobstructed. A plurality of high pressure turbo nozzles configured for emitting high pressure water are located around a circumference of the tubular suction tube such that the turbo nozzles surround the working end of the hydrovac boom hose to dislodge earthly materials under the device. An outer housing to enclose and protect the tubular suction tube, turbo nozzles, and onboard locating device, and to provide an air duct for ambient air to pass down threw. A plurality of air vents in the outer housing that provide flow of ambient air to an area being excavated. The conduit coupled with the outer housing, for allowing ingress of water to the plurality of high pressure turbo nozzles.

A cutting device for a cutting head includes a disc, a plurality of cutting elements secured to the disc, and a plurality of wear elements secured to the disc. The disc rotates about an axis of rotation, and the disc includes a peripheral edge. The cutting elements are spaced apart from one another along the peripheral edge of the disc. The wear elements are spaced apart from one another and from the cutting elements.