Cable Tray Seismic Bracing

I. Core Performance Characteristics

1. Strong Seismic Resistance

- Made of high-strength steel (e.g., Q235B, Q355B) or aluminum alloy, combined with seismic joint design (e.g., hinged, spring-type connections), it absorbs energy through flexible structures during earthquakes, reducing bridge displacement and preventing cable breakage due to severe shaking.

- Can withstand seismic loads with horizontal acceleration ≥0.6g (g is gravitational acceleration), complying with GB 50981 "Code for Seismic Design of Mechanical and Electrical Equipment in Buildings."

2. High Load-Bearing Capacity and Stability

- The bracket structure design adheres to mechanical principles, with a single bracket load capacity of 50-500kg (depending on specifications), supporting the weight of the bridge and cables while maintaining stability during vibrations to prevent collapse.

- Utilizes triangular stable structures or multi-directional supports to avoid single-point stress and enhance overall anti-overturning capability.

3. Flexible Adaptability

- Compatible with various specifications of cable trays (e.g., trough-type, tray-type, ladder-type), allowing customized installation by adjusting bracket height, spacing, and accessories (e.g., U-clamps, bolts).

- Suitable for multiple building scenarios (e.g., factories, commercial complexes, subways), and can be fixed on different walls/roofs such as concrete or steel structures.

4. Corrosion Resistance and Durability

- Surface treated with hot-dip galvanizing (zinc layer thickness ≥65μm), epoxy coating, or zinc-aluminum-magnesium coating, resistant to salt spray, moisture, and chemical corrosion. Outdoor service life can exceed 20 years, with long maintenance cycles in indoor environments.

II. Structural Design Advantages

- Multi-Directional Protection:

The bracket provides seismic support in longitudinal, transverse, and vertical directions, resisting seismic forces from different directions and preventing chain damage to the bridge due to unidirectional vibrations.

- Convenient Installation:

Standardized accessories (e.g., finished channel steel, seismic connectors) allow rapid on-site assembly without welding, reducing construction time and facilitating later adjustments (e.g., flexible disassembly of accessories when adding or removing bridges).

- Fire Resistance and Compatibility:

The material itself is non-combustible and matches the fire resistance requirements of bridges and cables; it can share a base with other mechanical and electrical seismic brackets (e.g., pipeline, duct brackets), saving space and costs.

III. Applicable Scenarios and Standards

- Mandatory Application Scenarios:

- In regions with seismic fortification intensity ≥6 degrees, cable trays in building mechanical and electrical engineering must be equipped with seismic brackets according to standards (e.g., hospitals, schools, high-rise buildings).

- Expansion joints, settlement joints, and straight bridge sections exceeding 30m in length require additional seismic brackets to mitigate structural deformation effects.

- Design Standards:

Must comply with GB 50981, CECS 420 "General Technical Conditions for Seismic Supports and Hangers of Building Mechanical and Electrical Equipment," and other standards. Post-installation, seismic performance testing (e.g., simulated seismic vibration table tests) is required.

IV. Differences from Traditional Brackets

Comparison Item: Seismic Bracket vs. Traditional Bracket

Seismic Capacity: Specifically designed to resist seismic loads vs. Only load-bearing, no seismic function

Structural Connection: Multi-directional hinged, flexible seismic resistance vs. Rigid fixation, prone to fracture during vibrations

Material Strength: High-strength steel, superior corrosion resistance vs. Ordinary steel, average corrosion resistance

Installation Cost: Higher initial cost but lower long-term maintenance costs vs. Lower cost but high post-earthquake repair costs

V. Selection and Installation Key Points

- Selection Basis:

Choose bracket models based on bridge specifications, cable weight, installation height, and seismic fortification intensity. For example, for a 200*100mm bridge in an 8-degree fortification area, a seismic bracket with a load capacity ≥200kg is recommended.

- Installation Spacing:

- Horizontal Bridges: Seismic bracket spacing ≤18m (fortification intensity 6-7 degrees) or ≤12m (fortification intensity 8-9 degrees).

- Vertical Bridges: Spacing ≤4m, with at least one bracket per layer.

Through the above performance characteristics, seismic brackets for cable trays ensure the integrity of the cable system during earthquakes, reduce the risk of post-disaster power outages, and enhance the safety of building mechanical and electrical systems.