Abstract: A floor cutting machine having a dust collection cover coupled thereto may comprise a main frame having a first dust collection cover fixing pin configured to attach the dust collection cover to the floor cutting machine; a plurality of front wheels located at a front of the main frame; at least one rear wheel located at a rear of the main frame; a cutting frame having one side fixed to a vicinity of the rear of the main frame and the other side configured to be moved upwards and downwards; a cutting blade fitted on opposite sides of a cutting shaft located in the vicinity of the other side of the cutting frame; and a front frame detachably connected to the front of the main frame, the front frame having a second dust collection cover fixing pin configured to attach the dust collection cover to the floor cutting machine.

Abstract: An underground gasifier pre-control structure includes a flame retardant injection system. The flame retardant injection system includes a flame retardant injection shaft pipe channel drilled from ground to a coal seam and a flame retardant injection channel located in the coal seam. The flame retardant injection channel includes a first flame retardant injection channel and a second flame retardant injection channel at both sides of each gasifier and a third flame retardant injection channel located in a horizontal direction of an adjacent gasifier. The first flame retardant injection channel includes a horizontal section along a strike of the coal seam and a bypass section offset toward the gasifier. The flame retardant injection system forms a wet coal wall in the coal seam to achieve pre-control for the gasifier. The pre-control structure wets the coal masses at both sides of the gasifier and the gasifier does not spread toward both sides.

Abstract: The disclosure refers to a road construction machine, adapted in particular in the form of a road paver or a feeder vehicle for a road paver. According to the disclosure, the road construction machine comprises a first and/or a second air barrier device adapted to shield a driver and/or an operator of the road construction machine. Furthermore, the disclosure refers to a corresponding method for generating an air flow during operation of a road construction machine in order to shield a driver and/or an operator from vapors and/or aerosols rising during operation of the road construction machine.

Abstract: Disclosed is a method for repairing an aquifer in a coal mine area by grouting, including: drilling a survey hole in a ground area corresponding to a water inflow position from ground surface to a caving zone in a goaf; determining a target layer for grouting in the survey hole based on drilling data collected from the survey hole while drilling; changing the survey hole to a grouting hole; measuring a first water level from the grouting hole; grouting through the grouting hole; changing the grouting hole to an observation hole; measuring a second water level from the observation hole; and determining a water retention level based on the first water level and the second water level.

Abstract: A method for setting the lifting position of a machine frame of a ground milling machine, which machine frame is connected via lifting means to movement means, and to a ground milling machine.

Abstract: A ground milling machine comprising a machine frame, a driver's cab, a drive motor, movement means driven by the drive motor and a milling unit for milling up ground material, wherein the driver's cab has a protection roof and a front window device through which an operator located in the driver's cab can look forward in a forward direction of the ground milling machine.

Abstract: A thumb pile provided with a fitting bracket improves work convenience by tensioning a tensile member while inserting a bracket constituted by a plurality of bracket members manufactured using a shearing method into a flange, and at the same time, more efficiently reduce bending stress occurring in a retaining wall through the improved bracket structure.

Abstract: A coastal resilience system for disrupting wave energy and storm surge flux and allowing accumulation of tidal-borne sediment has an interconnected network of biomatter-heavy floating mats positioned in water near a shoreline, and an interconnection subsystem with connection lines flexibly connecting adjacent floatable mats. Lines may be connected, at a plurality of force transfer points or regions within or near the interior of the mat, to other interconnection components positioned within the mat. In some embodiments, mats have yoke sites spaced around their edges and a connection line extends in a straight line from a first yoke site, through the interior of a mat, and to a second yoke site. The connection lines may intersect at an intersection position in the interior of the floatable mat, multiple connection lines may extend across the interior of the mat, but not always through a center of the interior of the mat.

Abstract: An apparatus for treating a growth medium via an electrical discharge, the apparatus includes a treatment chamber, at least a reservoir, a plasma reactor, an injector, an pressure regulation system, and in ignition unit including a voltage source configured to provide an electrical voltage, a converter configured to convert the electrical voltage from a DC voltage input to an AC voltage output, and an electrical connection interface configured to electrically connect the converter to an electrode of a pair of electrodes disposed in the plasma reactor, a feedback mechanism comprising a sensor configured to detect reaction data, and a control module configured to initiate a generation of an electrical discharge in a reaction region as a function of the AC voltage output, wherein the reaction region is configured to enable an interaction between the electrical discharge and a growth medium.

Abstract: A method for underground mining in a rock body include drilling one or more service boreholes from at least one surface location into a subsurface rock body. A plurality of multilateral blast holes is drilled, branching from at least one of the one or more service boreholes into the subsurface rock body. The plurality of multilateral blast holes are each loaded with one or more explosive charges and one or more detonators. The one or more explosive charges and the one or more detonators are inserted from surface. The one or more explosive charges is detonated wirelessly to fragment the subsurface ore body. Fragmented rock is extracted via the one or more service boreholes, to surface.

Abstract: Provided is a method and system for coalbed permeability-enhancement induced by pressure-relief with mining an extremely thin slice, belonging to the technical field of coalbed permeability-enhancement induced by pressure-relief. The method includes arranging a boundary gateway and a boundary roadway along a mine field boundary, constructing a row of boreholes into the coal seam to run through a conventional development roadway and the boundary roadway, and arranging devices in the conventional development roadway, the boundary roadway, and the row of boreholes to cut the extremely thin stratified coal seam between boreholes, thus creating a mining space in the coal seam, which causes a deformation failure of the coal around the boreholes.

Abstract: An I-patterned filling method for an initial stage of coal mining based on roof fracture characteristics is provided. A relationship between an overburden load borne by a main roof and an overhang size is determined based on principle of virtual work and a surgery theory when an overhang distance of the main roof reaches an initial weighting interval to enter a plastic limit state with an advance of a working face to obtain the initial weighting interval. An initial fracturing interval of an immediate roof is obtained in the same way. According to a subsidence law of the main roof in an inverted hip roof form, the filling is performed at a key position around an internal plastic hinge line through I-patterned three-strip filling. Size parameters of the I-pattered filling are designed to prevent the immediate roof and the main roof from being fractured.

Abstract: A pile upending and holding system includes a support assembly configured to be mounted on the vessel and to provide compensation for wave-induced motion of the vessel to maintain a predetermined X-Y location of the pile holder independent of said motion, and a pile holder mounted on the support assembly to be tillable about a substantially horizontal tilt axis. The pile holder includes a lower ring and an upper ring, and a pile holder frame supporting the lower ring and upper ring, the upper ring longitudinally spaced from the lower ring. Each of the rings include pile engaging devices distributed about the circumference thereof, each pile engaging device being adapted to engage an exterior of the pile extending through the lower and upper ring. Each of the lower ring and upper ring includes a ring base fixed to the pile holder frame and one or more movable jaws, movable between a closed position for holding and guiding the pile and an opened position for entry of the pile.

Abstract: An optical fiber sensing system according to the present disclosure includes an optical fiber (10) provided on a water discharge gate (30) of a reservoir or in a vicinity of the water discharge gate (30), a reception unit (21) configured to receive an optical signal including a vibration pattern from the optical fiber (10), and a detection unit (22) configured to detect whether an opening amount of the water discharge gate (30) is appropriate, based on a vibration pattern included in the optical signal.

Abstract: A control unit for controlling machine functions of a mining machine, such as an underground mining machine, tunneling machine or bolting rig, includes a flameproof housing having at least one fluid inlet and at least one fluid outlet, and a plurality of fluid control valves respectively communicating with the at least one inlet and outlet. In particular, the fluid control valves are formed inside at least one valve monoblock, the monoblock including a plurality of distinct fluid passages.

Abstract: An operating facility (1) for operating a mine by in-situ leaching comprises a supply manifold (9) for supplying leach liquor to the injector well heads (3), a production manifold (15) configured to discharge leachate to a leachate treatment plant (17), a treatment manifold (19), a facility (20) for providing a treatment solution configured to inject the treatment solution into the treatment manifold (19) and/or into the supply manifold (9); and for each producing well, a production pipe (21) equipped with a production cut-off device (25) and a treatment pipe (23) equipped with a treatment cut-off device (27), fluidically connecting the corresponding producing well head (5) in parallel, respectively, to the production manifold (15) and to the treatment manifold (19).

Abstract: A method for adjusting a surface of an exploratory data model of a geological domain to take into account blast hole data, the method comprising; drilling a plurality of blast holes proximal to the geological domain; recording blast hole data samples for each of the blast holes in an electronic data storage apparatus; operating a processing assembly in data communication with said storage apparatus according to instructions stored in a memory accessible to the processing assembly to perform the following acts: labelling each said data sample as domain or non-domain; determining blast hole boundary samples for the geological domain at each of a number of elevations to produce blast hole boundaries for the geological domain; comparing the blast hole boundaries to a surface of the exploratory data model; adjusting the surface based on the blast hole boundaries for the geological domain to generate an adjusted surface; and mining the geological domain based on the adjusted surface to thereby improve efficiency of

Abstract: A scarifier system for cutting channels into a ground surface according to a chosen design pattern, comprising a scarifier machine, and a guide system for guiding the scarifier machine on a tracked trail. The guide system for guiding the scarifier machine on a tracked trail can be, for instance, a sliding bracket clasping a guide rail or a rolling carriage having one or more pairs of wheels gripping a guide rail. A method of remodeling a ground surface using the scarifier system comprises the steps of planning a design pattern to remodel the ground surface and to mark the ground surface according to the chosen design pattern. The guide rail is installed on the ground surface according to the chosen design pattern and the scarifier machine is placed on the guide rail in a manner that the scarifier machine can slide along the guide rail to cut a channel into the ground surface.

Abstract: An isolated overburden grouting filling method for coal gangue underground emission reduction includes determining a grouting filling key stratum according to information of a coal face; constructing a directional borehole from an underground tunnel to the inside of the grouting filling key stratum; constructing a plurality of branch holes downward in a main hole of the directional borehole; and by establishing a grouting filling system under a mine, gangue obtained from excavation gangue of the mine and gangue sorting being made into a filling slurry by means of breaking and grinding, and the filling slurry filling fractures below the key stratum through the directional borehole. The gangue generated from a mine is directly made into a filling slurry under the mine and then fills overburden mining-induced fractures, thereby achieving harmless disposal of the gangue, effectively supporting a key stratum, and controlling stratum movement and surface subsidence.

Abstract: A composition including a fluorescent polymer tag and an aqueous-based drilling fluid is provided. Also provided is a method of determining drill depth of recovered drill cuttings. The method includes introducing a fluorescent polymer tag into a drilling fluid, the fluorescent polymer tag includes the composition having the fluorescent compound linked to the polymer. The method then includes circulating the drilling fluid through a well during a drilling operation that creates formation cuttings such that the fluorescent polymer interacts with the formation cuttings, creating tagged cuttings. The returned cuttings are collected from the circulating drilling fluid at a surface of the well. The method then includes detecting the presence of the fluorescent polymer tag on the returned cuttings to identify the tagged cuttings, and correlating the tagged cuttings with the drill depth in the well at a time during the drilling operation.