This invention relates to an injection tool which comprises a longer smaller diameter pipe assembled movable inside a shorter larger diameter pipe, a connection piece assembled at the first end of the smaller diameter pipe, a projecting part connected to the smaller diameter pipe near the connecting piece, the projecting part having an opening or groove for a bolt, a projecting part connected near to the first end of the larger diameter pipe the projecting part having threaded opening for the bolt, the bolt connecting the projecting parts and the bolt having a fixed stopper plate, a nose piece assembled to the second end of the smaller diameter pipe, a press plate assembled to the second end of the larger diameter pipe and a sealing rubber around the smaller diameter pipe situated between the nose piece and the press plate. This invention also relates to a method for injection which comprises the steps of entering the injection tool to the borehole, tightening the injection tool to the borehole, connecting the injection machine to the injection tool, starting the injection, and an forming automatically functioning valve to the nose piece at the second end of the injection tool.

The invention is an application that completely alter the operating principle and load transfer mechanism of the anchorage technique used in the field of civil engineering, in particular at the excavation bracing and slope stability applications with a novel root zone apparatus.

A rock drilling machine, rock drilling rig and method of reinforcing rock surfaces by means of grouting material is provided. The grouting material is fed through the rock drilling machine to a drilling tool connected to the rock drilling machine. The rock drilling machine include a flushing feed path, which is utilized in the feeding of the grouting material.

A self-drilling differential grouting combined bolt, as described consists essentially of a drill (1), a grouting pipe (2), a spindle (3), a bolt head mechanism and a bolt tail mechanism, wherein the bolt head mechanism comprises a fixed ring (4), a slip ring (7), a limiting pipe (6) and several pairs of driven linkages (501) and driving linkages (502); and the bolt tail mechanism comprises a bolt disc (11), a connecting cap (12), a spring (13) and a nut (14), the bolt disc (11) is sleeved on a rear end of the grouting pipe (2), the connecting cap (12) is passed through by the spindle (3) and blocks off the rear end of the grouting pipe (2), the connecting cap (12) is provided with a grouting hole in communication with the grouting channel in the grouting pipe (2), and a grouting hole and an air vent are provided in the bolt disc (11).

A pumpable resin system for installation of mine roof bolts includes a resin feed cylinder pump, a catalyst feed cylinder pump, a resin cylinder pump in fluid communication with the resin feed cylinder, with the resin feed cylinder configured to transfer resin to the resin cylinder pump when the resin feed cylinder pump is actuated, a catalyst cylinder pump in fluid communication with the catalyst feed cylinder, with the catalyst feed cylinder configured to transfer catalyst to the catalyst cylinder pump when the catalyst feed cylinder pump is actuated, a resin line in fluid communication with the resin cylinder pump, and a catalyst line in fluid communication with the catalyst cylinder pump.

A method and an apparatus for rock reinforcement are described. The method comprises the steps: to inject a first component and a second component through a first channel and a second channel respectively into a rock hole, wherein the first component and the second component are adapted for rock reinforcement and to inject a blocking agent through a third channel into at least said second channel, wherein said blocking agent provides a barrier in at least said second channel.

This invention relates to an injection tool which comprises a longer smaller diameter pipe assembled movable inside a shorter larger diameter pipe, a connection piece assembled at the first end of the smaller diameter pipe, a projecting part connected to the smaller diameter pipe near the connecting piece, the projecting part having an opening or groove for a bolt, a projecting part connected near to the first end of the larger diameter pipe the projecting part having threaded opening for the bolt, the bolt connecting the projecting parts and the bolt having a fixed stopper plate, a nose piece assembled to the second end of the smaller diameter pipe, a press plate assembled to the second end of the larger diameter pipe and a sealing rubber around the smaller diameter pipe situated between the nose piece and the press plate. This invention also relates to a method for injection which comprises the steps of entering the injection tool to the borehole, tightening the injection tool to the borehole, connecting the injection machine to the injection tool, starting the injection, and an forming automatically functioning valve to the nose piece at the second end of the injection tool.

A pumpable resin system for installation of mine roof bolts includes a resin reservoir configured to receive resin, a catalyst reservoir configured to receive catalyst, a resin pump arrangement in fluid communication with the resin reservoir, a catalyst pump arrangement in fluid communication with the catalyst reservoir, a delivery line in fluid communication with at least one of the resin pump arrangement and the catalyst pump arrangement, and a bolter arm configured to drill boreholes and install mine roof bolts. The delivery line is configured to deliver resin and catalyst from the resin reservoir and the catalyst reservoir to a borehole via the bolter arm.

A method for carrying out grouting between adjacent gateroads in internal-staggered split-level coal mining. A return air gateroad of a stoping face and an inlet air gateroad of a heading face are not on the same level. The return air gateroad of the stoping face is arranged along a roof of a coal seam. The inlet air gateroad of the heading face is arranged along a floor of the coal seam. There is a height difference between the return air gateroad and the inlet air gateroad in a vertical direction. During the construction process, the inlet air gateroad is excavated at a delay distance of 180-200 meters from the return air gateroad. The drilling and grouting are performed while excavating the roadway, where grouting holes are arranged in a single row. A device for implementing the method is also provided.

A rock anchor assembly includes a rock anchor with a flexible element and first/second cylindrical connector elements engaged to proximal and distal ends of the element, a flexible tubular sleeve longitudinally extending between first and second ends, on the rock anchor so end parts of the rock anchor project from sleeve ends; a load bearing barrel centrally bored engaging the first connector element between the first end of the sleeve and a proximal end of the rock anchor, the barrel engaging the first end of the sleeve in sealing contact, the barrel having a grout conduit between the barrel exterior and the bore, the conduit defining part of a grout passage interconnecting the barrel exterior and sleeve interior, when the barrel engages the sleeve; a seal preventing grout outflow but accommodating grout inflow; a tensioner engaging the first tubular connector element, and a mechanical anchor engaging the second tubular connector.