The Passive Slope Protection Net is a flexible barrier system consisting of steel wire rope nets (or ring nets), support ropes, steel posts, anchor systems, and energy dissipators. It is installed on slopes to intercept falling rocks or restrain coarse particles in debris flows. The Passive Slope Protection Net complies with TB/T3089-2004.

Technical Parameters

RX Series – Double-twist wire rope net

Model	Net Type	Max. Interception Energy	Typical Application	Post Type	Structural Features
RX-025	D0/08/250	≤250 kJ	Single block ≤0.5 m³, low-risk area (e.g. scenic trail)	Type 16 I-beam	Single-layer wire rope net, lightweight
RX-050	D0/08/200	≤500 kJ	Single block ≤1 m³, medium-steep slope, highway/mining slope	Type 18 I-beam	Double support rope, general purpose
RX-075	D0/08/150	≤750 kJ	Single block ≤2 m³, high-risk slope, hydropower project	Type 22B I-beam (reinforced)	Reinforced post + deep anchor

RXI Series – Ring net (high-energy)

Model	Net Type	Max. Interception Energy	Application Notes	Additional Components
RXI-025	R5/3/300	≤250 kJ	Same energy class as RX-025	-
RXI-050	R7/3/300	≤500 kJ	Same energy class as RX-050	-
RXI-075	R7/3/300	≤750 kJ	Same energy class as RX-075	-
RXI-100	R9/3/300	≤1,000 kJ	Intermediate high-energy class	-
RXI-150	R12/3/300	≤1,500 kJ	High-energy class	-
RXI-200	R19/3/300	≤2,000 kJ	Extreme risk (boulders >2 m³, debris flow)	Ring net + pressure ring + inner grid mesh

Product Advantages (Data-Supported)

Corrosion resistance

Uncoated galvanized steel wire rope provides ≥30 years service life under normal atmospheric conditions (per TB/T3089-2004). PE-coated option reduces corrosion rate in aggressive environments (e.g., pH 4–6, chloride >200 mg/m²/day) with approximately 8–12% tensile strength reduction per ISO 9223.

Small rock retention

Optional inner galvanized wire grid (aperture 50×50 mm, wire diameter 2.2 mm) retains fragments down to 50 mm diameter without affecting main net flexibility.

Standard compliance

Full system tested per TB/T3089-2004 drop-weight impact test method; energy dissipation devices calibrated via force-displacement curves (pressure ring stroke up to 500 mm for RXI-200).

Installation access

All components (posts, nets, anchors) weigh ≤35 kg per piece, enabling manual transport on slopes >45° without heavy machinery.

Applications

Risk Level	Rock Volume / Scenario	Recommended Model
Low	<0.5 m³, scenic trails, low-angle slopes	RX-025
Medium	1–2 m³, mining slopes, mountain highways	RX-050 / RX-075
High	>2 m³ boulders, seismic zone railways, hydropower stations	RXI-200
Special	Small fragmented rocks	Add 50×50 mm inner grid
Special	High-corrosion environment (e.g., coastal, industrial)	Specify PE-coated variant

FAQ

Q1: What is the technical difference between RX and RXI series nets?

A: RX series uses double-twist wire rope net (D0/08/xxx) with mesh aperture of 250/200/150 mm, respectively. RXI series uses ring net (R5/3/300 to R19/3/300) constructed from high-tensile steel wire rings (wire diameter 3 mm, ring outer diameter 300 mm). The ring net provides higher energy dissipation per unit area due to multi-ring deformation capacity.

Q2: What is the standard test method for rated interception energy?

A: Per TB/T3089-2004, each model is validated by dropping a concrete block of specified mass and velocity at mid-span between two posts. The system passes if no component fracture exceeds 5% of net area and residual clearance meets site requirements.

Q3: What are the anchor specifications for the RXI-200 model?

A: RXI-200 requires double corrosion-protected anchors (minimum 2×φ16 mm galvanized wire rope anchors or φ25 mm grouted rebar anchors) at each post base. Pull-out resistance shall be ≥150 kN per anchor in competent rock (UCS >30 MPa). For soil slopes, extended anchor lengths (≥6 m) or micropile foundations are required – custom design necessary.

Q4: What is the maximum standard interception energy of the Passive Slope Protection Net?

A: The maximum standard interception energy among standard configurations is 2,000 kJ, achieved by the RXI-200 model. Higher energy levels (up to 5,000 kJ) are available via custom design.

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