A damped abrasive cutter having a machine attaching end; an abrasive surface comprising abrasive particles disposed in a binder; a central damping body connecting the machine attaching end to the abrasive surface. The central damping body formed from a synthetic polymer having a Storage Modulus from 1000 MPa to 2500 MPa and a Loss Factor from 0.025 to 0.10.

A pipe drilling device includes a casing having a divided structure and externally fitted to a fluid pipe in a sealed manner, a process valve including a process valve body that comes into contact with and separates from a recessed valve seat portion provided inside a neck portion of the casing, a drilling machine including a cutter that is inserted into the casing and configured for drilling the fluid pipe in an uninterrupted flow state, and a cylindrical portion that is movable to open and close an opening of the recessed valve seat portion inside the neck portion.

Provided are hand-portable directional drilling devices designed to drill through space underground, particularly for drilling channels underground from within an interior building space. Also provided are improvements in a fixable, positionable metal wrench collar and a drill stem joint breakout system.

In one embodiment, a system includes a counterbore drill bit, pre-cut lead rods of predetermined length, and a tapper tool. The counterbore drill bit includes a stop collar to drill counter bored holes with a first hole portion having a first diameter to a first depth below a surface of a material and a second hole portion having a second diameter less than the first to a second depth below the surface. The lead rods are inserted into the counter bored holes. The tapper tool mashes the second end of each lead rod in the one or more counterbored holes to expand and friction fit then in the counter bored holes. The system further includes circular survey tags insertable into the first hole and fasteners with a head and a shaft insertable through a center hole in the survey tags to retain the tags coupled to the lead rods.

A construction site status monitoring device is provided including processing circuitry configured to receive teaching data from a construction device in a teaching mode based on an operator performing an operation with the construction device and generate an operation profile based on the teaching data for execution by one or more construction devices. The operation profile defines parameters associated with the operation to enable one or more construction devices to repeat the operation in an operate mode.

A curved cover glass includes a plate-like glass body having a first surface, a second surface facing the first surface and at least one end face. The plate-like glass body has an average thickness of 5 mm or less. Among tangential directions on the first surface at an arbitrary point, when an X-axis is assumed to be a direction in which a first curvature radius R.sub.1 in cross-section of the first surface in an XZ plane is minimum, the first surface has a curvature part in which the surface is bent in the X-axis direction at least at one point on the first surface. The first curvature radius R.sub.1 is 10,000 mm or less. The curvature part includes at least one opening or concave part extending from the first surface to the second surface.

A curved cover glass includes a plate-like glass body having a first surface, a second surface facing the first surface and at least one end face. The plate-like glass body has an average thickness of 5 mm or less. Among tangential directions on the first surface at an arbitrary point, when an X-axis is assumed to be a direction in which a first curvature radius R.sub.1 in cross-section of the first surface in an XZ plane is minimum, the first surface has a curvature part in which the surface is bent in the X-axis direction at least at one point on the first surface. The first curvature radius R.sub.1 is 10,000 mm or less. The curvature part includes at least one opening or concave part extending from the first surface to the second surface.

A construction robot for a ceiling is provided. The construction robot includes: a robot base having an upper plate; a targeting unit on the upper plate, wherein the targeting unit moves a robotic arm assembly combined with the targeting unit, and wherein the robotic arm assembly includes: a first robotic arm where a drill is mounted, wherein a first elevating unit of the first robotic arm is elevated or lowered according to information on the ceiling, a second robotic arm where an anchor bolt inserting equipment is mounted, wherein a second elevating unit of the second robotic arm is elevated or lowered according to the information, and a third robotic arm where an impact wrench is mounted, wherein a third elevating unit of the third robotic arm is elevated or lowered likewise; and a loading unit on the upper plate or the targeting unit for providing anchor bolt assemblies.

A tool guide has a holder, a lifting mechanism and a chassis. The holder is for fixing a portable power tool, and is mounted on the lifting mechanism. The lifting mechanism has a propulsion system for vertically raising the holder. The chassis has two wheels on a wheel axis, a drive which is coupled to the wheels, and a steering system. The lifting mechanism is rigidly mounted on the chassis. A center of gravity sensor is designed for detecting a lateral deflection x of the center of gravity G of the lifting mechanism in relation to the wheel axis. The steering system is designed to actuate the drive to output a torque which counteracts the deflection x. The lifting mechanism can be pivoted by means of a pivot drive. An inclination controller is designed to actuate the pivot drive in such a way that the inclination is minimized.

A tool guide has a holder, a lifting mechanism and a chassis. The holder is for fixing a portable power tool, and is mounted on the lifting mechanism. The lifting mechanism has a propulsion system for vertically raising the holder. The chassis has two wheels on a wheel axis, a drive which is coupled to the wheels, and a steering system. The lifting mechanism is rigidly mounted on the chassis. A center of gravity sensor is designed for detecting a lateral deflection x of the center of gravity G of the lifting mechanism in relation to the wheel axis. The steering system is designed to actuate the drive to output a torque which counteracts the deflection x. The lifting mechanism can be pivoted by means of a pivot drive. An inclination controller is designed to actuate the pivot drive in such a way that the inclination is minimized.