Abstract: A self-starting negative pressure drainage system for draining groundwater in a slope, includes: a declined borehole, a pipe boot, a permeable pipe and a drain pipe; wherein the declined borehole is divided into a permeable drilling section and a sealed grouting drilling section; wherein the permeable drilling section is on a lower portion of the declined borehole, and the sealed grouting drilling section is on an upper portion of the declined borehole; a water stop ring made of water-expanding rubber is provided between the permeable drilling section and the sealed grouting drilling section; the permeable drilling section comprises the permeable pipe; a top of the permeable pipe contacts the water-expanding rubber; a cavity is formed in the permeable pipe, an inlet of the drain pipe passes through the water stop ring made of water-expanding rubber and is inserted into the permeable pipe.

Abstract: A hydraulic drilling machine has a metal chassis shaped as a rectangular parallelepiped, drilling resources located at the front of the chassis, a rotary motor to drive drilling rods, and a hydraulic circuit. An electrical circuit powers the various components of the drilling machine. The machine can be mounted on the arm of a hydraulic mini-digger and operate without an extra hydraulic unit.

Abstract: A power assist lever arm attachment includes a drill, an L-shaped drilling head carried by the drill, an arm actuation cylinder carried by the drill, an arm piston extendable from the arm actuation cylinder, a lever arm pivotally carried by the arm piston and the drilling head and a bracket-engaging arm extending from the lever arm.

Abstract: This invention provides a roof bolt installation apparatus including a drill stabilizing mechanism including a base having a cylindrical bore therein, and a stabilizing rod extendable from the base and slidably located in the bore. The rod has a distal end, and a drill stabilizing end plate is mounted on the rod distal end. The roof bolt installation apparatus also includes a drilling unit which is adapted to rotatably carry a drill, the drilling unit being slidably mounted on the drill stabilizing mechanism, and a mechanism for moving the drilling unit along the drill stabilizing mechanism. The roof bolt installation apparatus also includes a drill depth control device including a base, a top adapted to engage the mine roof, and at least two bars connected between the drill depth control base and the drill depth control top. The bars pass through openings in the drill stabilizing plate.

Abstract: A carriage system supports an impact or driver tool. The carriage system has a support member that extends upwardly from a base platform. Support arms are rotatably connected to the support member at medial portion of the arms at different elevations above the support member. A proximal end of each of the arms rotatably connects to a weight, while a distal end of each of the arms is adapted to rotatably connect to the driver tool. The weight is located on an opposite side of the support member from the driver tool when the driver tool is attached. When the weight is moved in a vertical direction, the arms rotate in combination with the movement of the weight. The arms rotate about their respective medial connections, thereby forcing the ends that rotatably connect to the driver tool to move in a vertically opposite direction than the weight.

Abstract: A device for the removal of a liner bolt from a SAG mill including a support member for affixing to an exterior surface of the SAG mill and a ram affixed to the support member and having an end movable relative to the support member. The end serves for compressive abutment with a surface of a liner bolt. The support member includes a first arm, a second arm, and a strut connected to the first and second arms. The ram is affixed to the strut. A first bolt receptacle is formed on an end of the first arm and a second bolt receptacle is formed on an end of the second arm. The ram includes a cylindrical member affixed to and extending downwardly from the support member, a circular frame affixed to the support member and rigidly affixed to the cylindrical member, and a hydraulic ram having a body received within the cylindrical member.

Abstract: A safety stabilizer for an auger having a screw, and an engine, and handles, and having two stabilizer legs, swingable upper joints on each leg, and anchors on the lower end of each leg.

Abstract: A drilling device for producing drill holes with undercuts comprises a drill having a drill shaft with extending drill blades, a shoulder projecting from the drill shaft, and a guiding sleeve surrounding the drill shaft between the shoulder and the drill blades, the guiding sleeve having two ends provided with openings of different sizes, the guiding sleeve having a sleeve edge which forms a support for the shoulder and a wall abutment for the collar.

Abstract: Method for sinking a cased borehole for producing cased pile foundations. The method uses an apparatus comprising a crane, a drilling appliance capable of being lowered into the borehole and a tube extraction machine with double-acting lifting cylinders for increasing the drilling pressure and for extracting the drop tube after the pile has been concreted. The drilling appliance is capable of producing a borehole with a larger diameter than that of the drop tube and can be fixed to the drop tube by means of a clamping device for withstanding the torque of the motor used for driving the drilling tool. In the method, the drop tube is axially secured and is prevented from locating with respect to the ground, a section of borehole having a greater diameter than the diameter of the drop tube is drilled, and subsequently the axial securement of the drop tube is released so that the drop tube slides downwards by a length corresponding to the length of the section of borehole drilled.

Abstract: A drill hole in a rock body is collared by drilling a pilot hole into a tunnel, advancing the pilot drill across the tunnel to drill a hole in the opposite wall of the tunnel aligned with the pilot hole, mounting the borer head on an arbor located across the tunnel in both holes, rotating the borer head to collar the hole, and detaching the borer head from the arbor.

Abstract: A drilling assembly includes a drilling tool having a shank and a drill bit at the leading end of the shank and having cutting edges. The assembly further includes a collar adjustably and arrestably mounted on the shank, and an abutment member having a central passage into which the tool element is received at least during terminal phase of the drilling operation. The collar has a convex contact surface, and the abutment member is formed with a depression bounded by a concave contact surface, the two contact surfaces sliding on one another when the tool element is pivoted to form an undercut hole in a support structure. The abutment member abuts against a surface of the support structure around the open end of the hole, and is prevented from rotating with the tool element either by pins which penetrate into the support structure, or by a layer of friction-retarding material, such as rubber, interposed between the abutment member and the surface of the support structure.

Abstract: A drilling machine for drilling floors or walls having a frame in which a drilling rod is displaced by a screw member. A container on the frame is placed around the drilling rod to fasten the frame to the floor or wall, to cool the drill, and to collect the drilling debris.