A rock bolt and meshing assembly is arranged for installation of a meshing sheet against a surface of rock strata. The rock bolt includes an adapter having a first portion connectable to a trailing end of an elongate shaft of the rock bolt and means configured to receive and mount a meshing clamp to overlay a second section of meshing sheet against an already laid first section of meshing sheet.

A self-drilling differential grouting combined bolt and method of anchoring the same are described. The bolt 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 method of anchoring includes the steps of hole drilling, hole expanding at inner anchor end, differential grouting rock bolt fastening.

The invention discloses a retrievable sand consolidation anchor head prestressed anchor rod, an anchoring jack and an application method thereof, and belongs to the technical field of geotechnical engineering. The retrievable sand-consolidated anchor head pre-stressed anchor includes a bolt body 6, a rigid frame 5, a load member 1, a sand column 2, a pressure receiving member 4, a cut-off member 3, and an anchor pier 8. The anchoring jack includes a force transmitting frame 12, a first guiding plate 25, a second guiding plate 28, and a housing 13. The application method includes an anchoring method using the retrievable sand-consolidated anchor head prestressed anchor rod and a method of recovering the retrievable sand-consolidated anchor head pre-stressed anchor rod. After the anchoring of the reclaimed sand-consolidated anchor head pre-stressed anchor rod, the bolt body can be recovered and reused, and the operation is simpler and more environmentally friendly.

Provided is a mounting method for an extensible reaming self-anchoring anchor rod, which is especially applicable to roadway construction in coal mines. A big helical structure is arranged on two rod sections of a sectional type anchor rod, a simple drill bit drills and reams a bore and cuts the coal mass in one operation, the outer diameter of the simple drill bit is smaller than the outer diameter of the big helical rod body, and the big helical structure accomplishes secondary reaming, self-drilling and self-anchoring in the drilling process; the big helical structure inhibits propagation and development of sheet cracks of the coal wall in the radial direction, and is embedded in the coal mass through a self-stabilization process of the rock mass.

The present invention provides a reaming and self-rotating anchor rod and a construction method using the reaming and self-rotating anchor rod, which are applicable to supporting for quick tunneling of coal roadways. The reaming and self-rotating anchor rod comprises a rod body, a drill bit, a connecting member, a tray and a nut; one end the connecting member is snap-fixed to the tail part of the rod body, the other end of the connecting member is connected to an anchor rod bolter, the rod body has an annular protrusion at its middle part to block powder so that the powder fills up the clearance between the rod body and the coal mass; the drill bit has female threads and can be screwed into the front part of the rod body, and the drill bit has baffle pawls and spiral grooves on its side surface; a hole in length smaller than the length of the anchor rod is drilled out with an anchor rod bolter first, and then the anchor rod is connected to the anchor rod bolter, the drill bit on the front part of the anchor rod is placed in the preformed hole, and finally the anchor rod is driven to ream and rotate into the coal mass, so as to accomplish the construction with the reaming and self-rotating anchor rod; the reaming and self-rotating anchor rod can shorten supporting time and avoid an abandoned borehole phenomenon incurred by hole collapse or blockage, and anchoring failure, etc., and the anchor rod is simple to manufacture, low in cost, and simple and convenient to operate. Therefore, the anchor rod and the method of using it can be widely applied and can meet the requirement for quick tunneling of coal roadways.

Provided is a mounting method for an extensible reaming self-anchoring anchor rod, which is especially applicable to roadway construction in coal mines. A big helical structure is arranged on two rod sections of a sectional type anchor rod, a simple drill bit drills and reams a bore and cuts the coal mass in one operation, the outer diameter of the simple drill bit is smaller than the outer diameter of the big helical rod body, and the big helical structure accomplishes secondary reaming, self-drilling and self-anchoring in the drilling process; the big helical structure inhibits propagation and development of sheet cracks of the coal wall in the radial direction, and is embedded in the coal mass through a self-stabilization process of the rock mass.

Disclosed is a grout anchored rock bolt which includes an elongate cylindrical body of a suitable material which has at least one integral anchor portion which includes of a plurality projection, each of which extends laterally from the body in at least one radial direction, wherein the projections are consecutively serially arranged along the length of the anchor portion and wherein each projection is radially offset relatively to the preceding formation at an angle that is not orthogonal.

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.

The invention discloses a retrievable sand consolidation anchor head prestressed anchor rod, an anchoring jack and an application method thereof, and belongs to the technical field of geotechnical engineering. The retrievable sand-consolidated anchor head pre-stressed anchor includes a bolt body 6, a rigid frame 5, a load member 1, a sand column 2, a pressure receiving member 4, a cut-off member 3, and an anchor pier 8. The anchoring jack includes a force transmitting frame 12, a first guiding plate 25, a second guiding plate 28, and a housing 13. The application method includes an anchoring method using the retrievable sand-consolidated anchor head prestressed anchor rod and a method of recovering the retrievable sand-consolidated anchor head pre-stressed anchor rod. After the anchoring of the reclaimed sand-consolidated anchor head pre-stressed anchor rod, the bolt body can be recovered and reused, and the operation is simpler and more environmentally friendly.

An energy-absorbing rockbolt includes an anchorage structure, wherein two ends of the anchorage structure are respectively provided with a mixing blade and a threaded fastening section; a nut is screwed to the threaded fastening section; a plate is mounted at one end, which is close to the threaded fastening section, of the anchorage structure in a sleeving manner; one side of the plate abuts against the nut; the anchorage structure consists of first anchorage structure parts and second anchorage structure parts, wherein the second anchorage structure parts are arranged between two first anchorage structure parts; each of the second anchorage structure parts is an elliptical rod-shaped structure; a plurality of inwardly-concave arc-shaped grooves are formed in an outer wall of the second anchorage structure part in an axial direction, and a reinforcing rib is convexly formed at an intersection of two adjacent arc-shaped grooves.