TSC-500-ZD Hybrid

Area of Application

The TSC-500-ZD Hybrid is a low energy rockfall catchment fence that has a hinged connection to the base plate and so requires upslope retaining ropes to support the post head. Its design is based on the ETAG 27 tested TSC-500-ZD system with adaptations to allow it to function as a hybrid/attenuator.

Hybrid Functionality

Hybrid systems are designed to absorb rockfall impacts in the upper superstructure, reducing the energy as much as possible, before allowing the material to progress downslope to a lower point where maintenance can be carried out more easily.

Rope Guidances

The upper and ropes are led through a rope guidance that is integrated on each post head. The guidance is designed to be robust and with no movable parts in order to ensure longevity and zero maintenance. Lower bearing ropes are not attached to the posts or the base plates. Instead, the rope is lead directly through the nets at a position lower than the base plates.

Integrated Ladder

Each post has an integrated ladder composed of rungs spaced at 50 cm intervals in the webbing of the I-beam. The ladder assists in the installation of the fence as well as routine inspection and maintenance.

Retaining Rope Anchorage

The post head is secured using s retaining ropes that lead to an upslope anchor in the middle of the field on either side of the post. This gives side-to-side stability of the post as well as the ability to lead forces into the ground. One anchor is shared between two posts. For the TSC-500-ZD Hybrid, there are no brake elements on the retaining ropes.

Lateral Anchorage

The lateral anchoring is completed with thimbles and shackles on every rope for a technically correct connection and ease of maintenance. The TSC-500-ZD Hybrid has brake elements on the bearing ropes but none on the retaining ropes from the head of the post.

AVT-phx Brake Element

The AVT-phx series of brake elements are steel coils that unravel when a force is applied. The gauge, width and number of coils can be specified in order to control the amount of energy absorbed and the total displacement. With no moving parts, these are some of the safest and most reliable brakes in the industry.

ModelTSC-500-ZD Hybrid
StyleHinged System
Energy Class2
Maximum Energy Level
Certified/Tested [kJ (ft∙tons)]
500 / 527
(184 / 194)
Service Energy Level
Certified/Tested [kJ (ft∙tons)]
Available Heights
[m (ft)]
4.0 - 5.0
(13.1 - 16.4)
Primary Net
ModelOmega-Net 7.5/135
TypeSteel Wire Cable
Rope Diameter
[mm (inch)]
Rope Construction1 x 7 Spiral
Single Wire Diameter
[mm (inch)]
Corrosion ProtectionZn or ZnAl (Class A)
Mesh Size
[mm (inch)]
135 x 135
(5.3 x 5.3)
Unit Weight
Mesh Tensile Strength
calculated [kN/m (lbf/ft)]
Connection to Main RopesThreaded
Connection to Adjacent Panel3/8" Shackle

The primary net material used in Trumer systems is called the Omega-Net. It is a steel cable net made from spiral rope that has thick individual wires to resist abrasion. The strands of rope are pre-bent into arcs resembling an omega shape and then woven together to make the net. This process yields an extremely strong net with high flexibility and energy absorption characteristics.

Bearing Ropes
per fence segment
Rope Diameter
[mm (inch)]
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Element
per rope
Brake Element ModelAVT-phx 60/30-2.5
Middle Ropes
per fence segment
Rope Diameter
[mm (inch)]
Corrosion Protectionn/a
Brake Element
per rope
Brake Element Modeln/a
Retaining Ropes
per fence segment
Rope Diameter
[mm (inch)]
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Element
per rope
Brake Element Modeln/a
Post Base Support
Post TypeHEA 140
Integrated LadderRungs every 0.5 m (19")
Rope GuidesIntegrated
Post Weight
as tested ([kg (lbs)]
Base Plate ConnectionTongue and Pin
Base Plate Foot Print
([mm (in.)]
650 x 200
(26 x 8)
Base Plate Weight
[kg (lbs)]
per base plate
Post Base Support
Retaining Rope Anchorage
Lateral Anchorage
Anchor Forces
Base Plate
Fk,par [kN (kips)]
Lateral Anchor
Fk,lat [kN (kips)]
Retaining Rope Anchor
Fk,ret [kN (kips)]
Typical Recommended Anchors Based on Steel Grade
Anchor PositionQuantity
per 50 m
10 m post spacing
500/550 MPa
(e.g. GEWI)
670/800 MPa
(e.g. GEWI Plus)
min 470 MPa
(e.g. IBO)
Base Plate122522site dependent
Typical Cross Section
Typical Layout