Abstract: A pile grabbing apparatus comprising a steel I-beam of appropriate length supporting two claw assemblies. The claw assemblies are each driven by two hydraulic cylinders to grab and hold a concrete pile. A pair of steel support plates are welded onto the I-beam and with a "quick coupler", the I-beam is attached to the arm of a mobile excavating apparatus, such as a dirt excavator. The hydraulic cylinders are connected to hydraulic hoses and controlled by a control module. The operator at the control module may manipulate the claw assemblies to open and close.

Abstract: So that explosives can be placed in an underwater hole in rock efficiently, a rock drilling machine having a rock drill mounted for extension and retraction on a strut which can be forced against a surface to be drilled, has a short debris guard tube fixed to the strut so as to extend beyond the terminus of the strut so that the debris guard may be forced against and held against the surface of the rock to be drilled. In such a machine having a very long strut and drill rod for drilling holes in rock submerged at a depth of water over four feet, a drill guide tube fixed to the strut between the debris guard and the drill has a full length door. After the hole has been drilled to depth, the drill rod is retracted from the debris guard and deflected to one side (and out of the drill guide tube door of the long strut version) and a long explosives placement tube is inserted through the debris guard tube into the hole. The debris guard is then slipped off and freed from the placement tube by retracting the strut.

Abstract: So that explosives can be placed in an underwater hole in rock efficiently, a rock drilling machine having a rock drill mounted for extension and retraction on a strut which can be forced against a surface to be drilled, has a short debris guard tube fixed to the strut so as to extend beyond the terminus of the strut so that the debris guard may be forced against and held against the surface of the rock to be drilled. In such a machine having a very long strut and drill rod for drilling holes in rock submerged at a depth of water over four feet, a drill guide tube fixed to the strut between the debris guard and the drill has a full length door. After the hole has been drilled to depth, the drill rod is retracted from the debris guard and deflected to one side (and out of the drill guide tube door of the long strut version) and a long explosives placement tube is inserted through the debris guard tube into the hole. The debris guard is then slipped off and freed from the placement tube by retracting the strut.