Tunnel Steel Cable Ladder Hot Dip Galvanized 75mm-250mm Depth ISO 1461
Product Details
Tunnel Cable Ladder
,Galvanized Steel Cable Ladder
,Tunnel Ladder Tray
Hot-Dip Galvanized Steel Cable Ladder for Tunnels addresses the environment that destroys ordinary cable support fastest: permanent humidity, exhaust and brake dust, wash water, vibration from traffic and a service life measured against the design life of the tunnel itself, not the maintenance cycle of a building.
The ladder is built from carbon steel rails of 1.5 mm to 3.0 mm with 75 mm to 250 mm height and rungs of 2.5 mm to 5.0 mm, welded at 225 mm, 300 mm or 450 mm pitch in widths of 150 mm to 900 mm. Support spans of 1.5 m to 9 m are achieved with engineered hanger brackets fixed to the tunnel lining or the soffit.
Galvanizing after fabrication is mandatory in this application, because every bracket hole, weld and cut end sits in the most corrosive part of the section. ISO 1461 coating of 65 to 85 micrometres, or a duplex powder coat system for C5 atmospheres, keeps the route maintenance free where access for repainting would require a tunnel closure.
Tunnel routes also demand fire performance and earthing continuity: the all steel ladder is non combustible, does not add smoke load, and every joint is bonded so the support system forms part of the protective earth path required by the electrical design.
BENDIN produces this ladder at up to 50000 m per week across carbon steel, stainless and aluminum lines, with 180 staff, thirty years of project experience and certified ISO 14001 and ISO 45001 operations. Around 60 to 70 percent of output goes to infrastructure and power contractors, and each order ships with dimensional and coating records.
Minimum order 100 m, 15 to 25 working day delivery, 20 to 50 USD per metre, carton, box or wooden case packing, terms L/C, D/P or T/T. Send the tunnel cross section and the cable schedule and we will return bracket spacing, expansion provisions and the fire and earthing documentation package.
Certification and Standard Reference| Standard / Specification | Scope of Application | BENDIN Status |
|---|---|---|
| ISO 1461 / ASTM A123 | Hot dip galvanized coating on tunnel duty ladder | Coating thickness measured per batch; record supplied |
| IEC 61537 / BS EN 61537 | Load, deflection and continuity of cable ladder | Design calculation and continuity check per order |
| EN 10025 | Carbon steel grade of rails and rungs | Material certificates and design reference supplied |
| IEC 60331 / BS 6387 (reference) | Circuit integrity under fire conditions | Fire test documentation on request |
| ISO 12944 (reference) | C5 atmosphere in tunnels and coastal works | Coating system selected to the declared corrosivity class |
| ISO 9001:2015 | Quality management system | ISO 9001 certified; certificate copy on request |
| CE marking | EU construction products as applicable | CE Declaration of Conformity issued with shipment |
BENDIN holds ISO 9001 quality certification and issues CE Declarations of Conformity. The standards above state the design and test basis of this product; third party test reports or national approvals are supplied on request and are not implied unless confirmed in the contract.
Technical Parameters| Parameter | Standard Range | Customization Available |
|---|---|---|
| Usable width | 150 - 900 mm (6 - 36 in) | up to 1200 mm |
| Rail height | 75 - 250 mm (3 - 10 in) | to drawing |
| Side rail thickness | 1.5 - 3.0 mm | to load case |
| Rung thickness | 2.5 - 5.0 mm | to load case |
| Rung spacing | 225 / 300 / 450 mm | custom |
| Support span | 1.5 - 9 m | engineered |
| Coating | HDG, pre-galvanized, powder coat | Duplex system |
| Standard length | 3000 / 6000 mm | cut to order |
Dimensions, rung spacing and surface treatment are produced to project drawings. Load and deflection calculations are issued for spans above 3 m.
Typical Applications- Road, rail and metro tunnels
- Utility and service tunnels
- Underground stations and shafts
- Mine drifts and conveyor galleries
- Coastal and river crossings
Q: Which coating suits a road tunnel?
A: Standard is hot dip galvanizing to ISO 1461 at 65-85 um. For C5 tunnel atmospheres with deicing salts we recommend a duplex powder coat over the zinc.
Q: How is the ladder fixed to the tunnel lining?
A: We supply engineered hanger brackets for lining or soffit fixing, with spacing from 1.5 m to 9 m confirmed by a load and deflection calculation.
Q: Is fire performance documented?
A: The all steel ladder is non combustible, and circuit integrity test documentation to IEC 60331 or BS 6387 is available on request for the specified system.
Q: What is the minimum order?
A: Minimum order is 100 m, delivery 15 to 25 working days, prices from 20 to 50 USD per metre.
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