A device that allows for the sequential operations of hole drilling, resin and catalyst insertion and rod insertion in a single machine is provided. The drilling part uses a regular mining drilling machine that is fitted onto the device. Once the hole is drilled, a pipe is inserted into the hole. There are two possible versions of the pipe, a single pipe configured to work with an air cannon shooting resin tubes and a co-joined double pipe to inject resin and a catalyst in separate co-joined pipes so as to emerge unmixed at the end of the pipes. The next step consists in screwing in the rod into the hole, the twisting motion mixes resin and catalyst and in a matter of seconds, the rod is fully inserted and the chemical reaction has started. Because of the speed and accuracy of insertion and the thoroughness of mixing, more catalyst than usual can be used for a faster hardening of the resin, which secures the rod much better and faster.

A resin input nozzle (10A) which is adapted to engage or connect to a hollow resin-anchored rock bolt (12) to introduce a resin composed of a plurality of resin components (A,B,C), into and through the bolt, the nozzle including a body (14) with a leading end (16), a leading end portion which ends at a leading end and a trailing end (18), a first conduit (22) and a second conduit (24) formed through the body, each conduit having an outlet (28A, 28B), which opens at or adjacent the leading end, and at least one inlet (26A, 26B) which is adapted to engage with a supply of a respective resin component, wherein the outlets are spaced from one another to prevent mixing of the resin components as each emerges from a respective outlet after passage through a respective conduit.

The present invention relates to a support method of preset internal cable for in-situ tunnel expansion project, comprising a cable, lockset and an anchoring agent, wherein before the excavation of the newly-built tunnel, a borehole is drilled into the surrounding rock from the in-situ tunnel, and the cable is installed in the borehole and pre-stressed, so as to play a supporting role at the moment of excavation of the newly-built tunnel. The cable is fixed in the depth of the surrounding rock by the anchoring agent, and the lockset of the cable is set at the position of the excavation contour line of the newly-built tunnel inside the surrounding rock. The present invention provides a method that does not interfere with the excavation construction and can effectively support the surrounding rock of the expanded tunnel in advance. It breaks through the “excavation first and then supports” model in the previous tunnel construction, and uses the space of the in-situ tunnel for pre-support, and by applying prestress, the deformation of surrounding rock can be controlled to the maximum extent.

An elongated connecting element for anchoring members, which is provided with a first anchoring end portion designed to be inserted into an anchoring region and a second end portion which defines a head, which lies opposite the first anchoring end portion and is designed to interact with an element to be anchored. The elongated connecting element includes an external tubular element which accommodates an internal elongated body, the external tubular element defining, at the head, at least one feeding port for a synthetic anchoring mix and, at the first anchoring end portion, at least one exit opening for the synthetic anchoring mix. The synthetic anchoring mix is configured to set, penetrating at least partially into the anchoring region and creating a stable connection between the anchoring region and the elongated connecting element and between the respective portions of the external tubular element and of the internal elongated body.

A pumpable resin system for installation of mine bolts includes a resin injection cylinder comprising a resin chamber and a resin hydraulic cylinder, a catalyst injection cylinder including a catalyst chamber and a catalyst hydraulic cylinder, with the resin hydraulic cylinder synchronized with the catalyst hydraulic cylinder, a hydraulic pump in fluid communication with the resin hydraulic cylinder and the catalyst hydraulic cylinder, a hydraulic reservoir in fluid communication with the hydraulic pump, and a delivery line in fluid communication with the resin injection cylinder and the catalyst injection cylinder. The delivery line is configured to deliver resin and catalyst from the resin injection cylinder and catalyst injection cylinder into a borehole.

The present invention provides a retainer device 1 for retaining or holding an anchor rod 11 of a rock anchor, especially a self-drilling anchor, in a hole H drilled above horizontal. The retainer device 1 comprises: a body portion 2 configured to be mounted on the anchor rod 11, e.g., on an outer or external periphery of the anchor rod, and at least one locking arm or tab 6, 7 that projects from the body portion 2 in a direction transverse to a longitudinal extent of the anchor rod 11. The body portion 2 is configured to engage an abutment or shoulder on the outer or external periphery of the anchor rod to prevent its movement relative to the anchor rod 11 in use, and the at least one arm or tab 6, 7 is configured to deform so as to engage and bear against an inner wall W of the hole H when the retainer device 1 mounted on the anchor rod 11 is driven into the hole H. The invention also relates to a rock anchor system 10, comprising: at least one elongate anchor rod 11; a drill bit 12 configured for attachment to one end region 13 of the elongate anchor rod 11 for drilling the anchor rod 11 into rock strata R; and at least one retainer device 1 according to the invention described above for retaining or holding the anchor rod 11 in a hole H drilled in the rock strata R above horizontal. The invention also provides a method for installing a rock anchor.

The present invention discloses a self-anchored opposite-pulling anti-impact anchor cable for sectional coal pillars and a using method thereof. The anchor cable includes a steel strand (100), with an energy-absorbing and yielding terminal (200) and a stressed expansion-cracking terminal (300) respectively fixed to two ends of the steel strand, a bushing (400) sleeved outside the steel strand, a first lock (610) provided at one end of the steel strand and a second lock (620) provided at the other end of the steel strand; the stressed expansion-cracking terminal includes a self-anchored bushing (420) with a plurality of pre-splitting lines (440) arranged in the wall of the self-anchored bushing. Under stress, the wall of the self-anchored bushing cracks along the pre-splitting lines and bends and expands, so that it abuts against and is self-anchored to the edge of a sectional coal pillar at the outer side.

An apparatus for injecting grouting material, mining machine and method of injecting grouting resin into several drilled holes is provided. The apparatus includes an injector head provided with a mixing device, which are both insertable into a drilled hole by a flexible feed hose. The injector head includes a valve assembly mounted inside a distal end portion of the feed hose.

A tool to aid in the installation of a rock bolt assembly in a rock hole which includes a drive shaft having a proximal end, which is adapted to engage with a drilling rig, and a distal end which includes a recess which is adapted to receive a trailing end portion of the rock bolt and which has a first seat against which an axially pre-set component of the rock bolt assembly abuts, a tubular sleeve telescopically engaged with the shaft which has a first end, which is adapted to receive an axially moveable component of the rock bolt assembly and which has a second seat against which the axially moveable component abuts, and a second end, wherein the sleeve is reciprocally moveable relatively to the shaft between a biased forward position in which the axially pre-set component and the axially moveable component are spaced, and a retracted second position in which the axially pre-set component engages or connects to the axially moveable component.

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.