What is the role of steel sloeplates in A120 Rail?
The steel soleplate on an A120 rail (a heavy-duty DIN 536 rail) acts as a critical intermediate, high-strength base layer installed between the rail and the concrete foundation or steel girder. Its primary purpose is to provide a stable, level resting surface that ensures accurate alignment and uniformly distributes the immense wheel loads of heavy-duty, high-frequency cranes, preventing localized stress on the foundation.
Key Roles of the Steel Soleplate on A120 Rail:
- Load Distribution: A120 rails are used for heavy-duty applications (100 kg/m). The soleplate distributes these high-intensity loads from the rail base to a larger surface area on the foundation, preventing structural deformation or failure.
- Foundation Protection: By providing a durable steel surface, it prevents direct, abrasive contact between the crane rail and the concrete, reducing wear and extending the lifespan of the entire track system.
- Precise Leveling and Alignment: Soleplates provide a flat, stable surface that allows for precise vertical and horizontal alignment (gauge, elevation, and straightness) before and during installation.
- Fastening Platform: They act as a base to which rail clips (often welded rail clips or bolted rail clips) are secured, holding the rail in place, often in combination with rail pads.
- Vibration Mitigation: Especially when used with rubber crane rail pads beneath the rail, the soleplate assists in damping the vibrations and noise produced by heavy lifting equipment.
Material composition and performance specifications of steel sloeplates
For DIN 536 A120 Crane Rail applications, steel soleplates (also known as base plates) are typically manufactured from structural carbon steel. The most common material grades used internationally are S235JR (St37-2) or S355JR (St52-3).
Given the extreme 100 kg/m weight and high lateral thrust of the A120 rail, S355JR is the preferred choice for heavy-duty port and steel mill environments due to its higher yield strength.
1. Chemical Composition (Typical S355JR Grade)
| Element | Symbol | Composition Limits (%) |
| Carbon | C | ≤ 0.24% |
| Manganese | Mn | ≤ 1.60% |
| Silicon | Si | ≤ 0.55% |
| Phosphorus | P | ≤ 0.035% |
| Sulphur | S | ≤ 0.035% |
| Copper | Cu | ≤ 0.55% |
2. Mechanical Performance Specifications
| Property | Metric Unit | Value (S355JR) | Value (S235JR) |
| Yield Strength (Re) | MPa | ≥ 355 | ≥ 235 |
| Tensile Strength (Rm) | MPa | 470 – 630 | 360 – 510 |
| Elongation at Break | % | ≥ 20% | ≥ 24% |
| Impact Strength (KV/20°C) | Joules | ≥27 J | ≥ 27 J |
| Weldability | - | Excellent | Excellent |
3. Dimensional Requirements for A120 Soleplates
| Feature | Standard Requirement for A120 |
| Thickness | Typically 20 mm to 40 mm (to ensure rigidity under 300 kN lateral force). |
| Width | Must accommodate the 220 mm rail base plus the welding width of the clips. |
| Surface Finish | Flatness within 0.5 mm over the rail seating area to prevent stress concentrations. |
| Corrosion Protection | Often Hot-Dip Galvanized or coated with anti-corrosive primer. |
FAQ: Frequently Asked Questions
- Do all A120 rails require steel soleplates?
While light rails can sometimes be mounted directly, A120 heavy rails almost always require soleplates. The immense wheel loads would otherwise damage concrete foundations or cause fatigue in steel girders that are not protected by a load-spreading plate.
How are soleplates attached to the foundation?
In A120 crane tracks, soleplates are typically secured to concrete using heavy-duty anchor bolts and non-shrink grout. On steel structures, they may be welded directly or bolted to the top flange of the crane girder.
- Can I reuse soleplates when replacing A120 steel rails?
If the soleplates are still flat, uncorroded, and the weld areas for the standard fastening clips are intact, they can often be reused. However, they should be professionally inspected to ensure they still meet the Specifications of A120 Rail support requirements.
- What thickness of soleplate is standard for A120?
There is no single "standard," but for the DIN536 A120 Rail System, thicknesses between 20mm and 40mm are most common to ensure the plate does not deform under the 101.2 kg/m weight of the rail and the added crane load.
- Are soleplates compatible with Alumothermic Welding?
Yes. In fact, a stable soleplate is necessary for a successful weld. When using Alumothermic Welding kits for Rails, the A120 Steel Crane Rail must be perfectly aligned on the soleplates to ensure the joint is seamless.
- Do soleplates help with noise reduction?
Indirectly, yes. By providing a flat surface for the rubber pad, the soleplate ensures the pad can effectively absorb vibrations, which is the primary method of noise reduction in A120 overhead crane rail systems.
Get a Quote in 24 Hours
The success of an A120 overhead crane rail systems depends on the harmony between the rail, the clips, the pads, and the soleplates. GNEE RAIL provides all these A120 rail accessories as a single, high-quality package. We can customize the dimensions and hole patterns of your baseplates/Steel Soleplates to fit your specific girder or foundation design.
Contact us to obtain a solution to discuss your DIN536 A120 Rail System needs and receive a comprehensive quote. Let GNEE RAIL provide the industrial-grade DIN 536 Standard Crane Rail and support components you need for a safe and durable installation.
