An energy absorption device for absorbing at least a portion of impact energy occurring in an impact of an impact body in a safety net construction includes at least one cable guiding unit forming at least one cable receiving region for receiving and/or guiding at least one cable, and further includes at least one energy absorption element, arranged in the cable receiving region and forming at least one friction surface for the guided cable, the energy absorption element being configured, if a force inducing movement of the cable across the friction surface is exerted on the cable, to selectively absorb at least a portion of energy the force created via substantial deformation and/or abrasion of the friction surface. A cable brake, particularly a block-and-tackle cable brake, includes an energy absorption element of the energy absorption device, which is arranged at the deflection element on a side facing toward the cable.

The present disclosure relates to a rockfall barrier for installation between an uphill side and a downhill side of a hill slope, with at least two guide devices for a net comprising an upper edge and a lower edge, and with an upper load-bearing rope, which guides the upper edge on the guide devices At least one middle rope is provided, which extends from an upper end point fixed to the upper load-bearing rope to a lower end point fixable at the hill slope.

A safety net for rockfall protection barriers includes two outer supports anchored to the slope or rock and at least two inner supports anchored to the slope or rock. Rope guide elements are arranged at the upper and lower ends of the outer and inner supports for respectively two upper net body load-bearing ropes and two lower net body load-bearing ropes. Respectively one of the two upper net body load-bearing ropes runs through a rope guide element of the inner supports and one of the two lower net body load-bearing ropes runs through a rope guide element of the inner supports and is guided past neighboring upper and lower rope guide elements of the inner supports.

The present invention discloses a shed tunnel structure for preventing a falling rock, including a shed tunnel body and a buffer plate for bearing impact of the falling rock, where the shed tunnel body includes a first supporting structure, and the first supporting structure is arranged on a side away from a ramp; one end of the buffer plate is connected to the ramp; a side face of the buffer plate close to the shed tunnel body is in movable contact with the first supporting structure, and the contact position is close to the other end of the buffer plate. The objective of resisting continuous impact of the falling rock can be achieved through the structural design.

A calculation method of limit load, deformation and energy dissipating of a ring net panel of a flexible protection net, includes step (1): determining geometrical parameters of the ring net, connection type of steel rings, and diameter of steel wires; step (2): determining a loading rate, a loaded region and a boundary condition of the ring net panel; step (3): obtaining basic mechanical parameters of materials through tests, and establishing a critical damage criterion of the ring net panel; step (4): establishing an equivalent calculation model of a ring net panel based on a fiber-spring unit; and step (5): calculating a puncturing displacement, a puncturing load and energy dissipating of the ring net panel. The method adopts a calculation assumption of load path equivalence.

An energy absorption device for safety nets and/or for rope constructions, in particular an impact damping device and/or a shock damping device and/or a traction rope brake device, has a brake unit which comprises at least one deflection element and at least one brake element extending at least section-wise around the deflection element and which is configured for an at least partial absorption and/or conversion of kinetic energy in at least one load case, in particular an impact case, and has a connection unit, which is configured for a fixation of the brake unit in at least one location of use, wherein the brake element is guided around the deflection element in a U-shape, wherein the brake element includes at least one first brake portion and at least one second brake portion, the brake portions differing from one another at least in regard to their local load capacities, and the first brake portion including at least one material recess, in particular an oblong hole.

A hexagonal wire netting (7), a process for manufacturing such a wire netting and a device for manufacturing a hexagonal wire netting (7), the device comprising an assembly of tubes (5) for leading the wires (I) of which every other is twisted into a spiral shape, a spindle (6) assembly and a drum (8) receiving the wire netting (7), the drum (8) being provided with detent elements (21). Between each tube (5) leading the spirally twisted wire (I) and the cooperating spindle (6) a straightening guide (IO, IO′) is located having an inlet opening (13, 15) cooperating with the tube (5) and an outlet opening (12, 20) cooperating with the spindle (6). The detent elements (21 are arranged on the drum (8) in such a way that the produced wire netting (7) has meshes in which the proportion of the width (A) to the length (B) is less than 0.75.

A throwing toughness buffer mesh unit for a rockfall protection and a design method of a critical throwing angle thereof are provided. The throwing toughness buffer mesh unit includes a cable column, wherein the cable column is provided with a sliding device on a top end and connected to a foundation structure via a hinged support at a bottom; a support rope, wherein the support rope is connected to the sliding device on the cable column in a sliding way and provided with a spring buffer on an end, wherein the spring buffer is obliquely anchored to a rock mass base near a protection structure; a protection net, which is obliquely hung on the support rope via a connector. A pavement inclination angle of the protection net is adjusted to a critical throwing angle by adjusting a height difference between cable columns to control a throwing track of falling rocks.

A method for producing helices for a chain-link net, said helices for forming the chain-link net being interconnected, and rotated into one another, wherein the helices are produced from at least one longitudinal element, in particular a single wire, a wire bundle, a wire strand, and/or a wire rope, with at least one wire being partially implemented from a high-tensile steel, and wherein the helices are bent so that they include a plurality of first legs, a plurality of second legs, and a plurality of bending regions that interconnect a first leg and a neighboring second leg, wherein the helices are bent, by a braiding knife assembly comprising at least one braiding knife, in such a manner that at least the center points of the first legs and/or at least the center points of the second legs of a completely bent helix each lie substantially in one plane respectively.

A deflection system and containment system are provided. The deflection system is for deflecting debris falling from a wall or roof. The deflection system comprises: two or more anchors; a support line extending between the anchors; and a deflection net, supported by the support line and spaced from the wall or roof, and configured to deflect debris falling from the wall or roof