Detailed explanation of stepped bridge products
Ladder Cable Tray is an open structure cable support system consisting of two side beams and transverse crossbars in a stepped shape. It has the characteristics of super strong load-bearing capacity, excellent heat dissipation, and easy installation. It is the preferred solution for laying large section power cables and industrial power lines.
1. Core structure and materials
(1) Basic Composition
Side beam: cold-rolled steel plate (galvanized/sprayed) | Functional features: main support structure, standard height 50/100/150mm
Ladder gear: Functional features: load-bearing core, preventing cable sagging
Connector: Galvanized bolt+reinforced joint plate | Functional features: Ensure cross connection strength and electrical connectivity
Attachment: Horizontal Bend, Vertical Convex Bend | Functional Features: Suitable for cable turning and climbing
(2) Material classification
Hot dip galvanized ladder frame: Zinc layer ≥ 65 μ m, outdoor service life of 20 years+
Stainless steel ladder frame: made of 304/316L material, resistant to acid and alkali corrosion
Aluminum alloy ladder frame: lightweight (1/3 of steel), no magnetic interference
2. Core advantages and limitations
(1) Advantages
Excellent heat dissipation: Open structure, cable temperature rise is 30%~40% lower than slot type;
Low cost: saving materials, the cost is only 60% of that of trough bridge.
(2) Limitations
Weak protection: not dustproof/waterproof, should be avoided for use in areas with high dust and humidity;
Electromagnetic interference: unshielded design, weak current cables need to be laid separately.
3. Typical application scenarios
(1) In the field of electric energy
Thermal power plant: High voltage cable laying (carrying 6kV/10kV large section cables);
Photovoltaic power station: DC combiner line (aluminum alloy ladder frame resistant to UV aging).
(2) Heavy industry scenario
Steel plant: Rolling mill power cable (high temperature resistance+heavy load design);
Port machinery: power supply lines for gantry cranes (resistant to vibration and impact).
(3) Special Needs Scenarios
Data center: Backup generator cables (with extremely high heat dissipation requirements);
Tunnel lighting: requires the use of fire-resistant coating (as specified in GB 50016).
4. Selection and installation specifications
Environmental adaptation:
Corrosion environment: stainless steel>hot-dip galvanizing>spray coating;
Cleanliness requirements: Aluminum alloy ladder frame (without any potential dust falling hazards).
Cascade bridge is a rigid demand product for high current and heavy load scenarios, and the selection should focus on:
1. Load bearing grade (calculated based on cable weight and span);
2. Corrosion resistance (environmental corrosiveness determines material selection);
3. Installation form (horizontal/vertical laying affects the support scheme).
Applicable mnemonic:
Heavy duty ladder rack, heat dissipation and cost saving "- suitable for dense laying of power cables;
Be cautious when using in damp and dusty environments, and choose a trough type for protection. When the environment is harsh, protective measures should be taken.
