EN 13230 Railway Applications - Track - Concrete Sleepers and Bearings

The European standard “EN 13230 Railway applications - Track - Concrete sleepers and carriers” consists of the following sub-sections published under the same title:

• The standard “EN 13230-1 Part 1: General requirements” describes the technical criteria and inspection procedures that component materials and finished concrete sleepers and carriers (e.g., prefabricated concrete sleepers, twin-block reinforced concrete sleepers, truss and crossing carriers, and special elements for railway lines) must meet.

The primary function of concrete sleepers and supports is to transmit vertical, lateral, and longitudinal loads from the rails to the ballast or other supports. During use, they are also exposed to frost damage and moisture, which can cause harmful chemical reactions within the sleeper.

This standard defines mechanical tests that ensure the capacity of sleepers or carriers to withstand repeated loading and provide adequate durability. Furthermore, controls are applied to production processes and testing to ensure the concrete does not deteriorate during use due to chemical reactions and frost damage.

A railway track is a structure consisting of transverse sleepers or girders fixed to the rails by a coupling system and supported by ballast or other supports. The track gauge is characterized by the rail profile, the slope of the rails, and the spacing between the concrete sleepers and girders.

In general, the main objectives of the EN 13230 standard are as follows:

• To define the minimum performance requirements that concrete sleepers must meet to ensure safety, durability, and reliability in railway networks.
• To define design principles (including design methods such as loads, load combinations, and limiting state design).
• Determining material requirements (such as concrete strength, reinforcement, prestressing steel).
• To determine test methods for type approval tests (such as static and dynamic bending tests, fatigue tests, rail bearing tests, electrical resistance).
• To define acceptance criteria for both factory production control and type testing.
• To ensure the interoperability and consistent quality of sleepers in European railway systems.
• This includes sleepers for conventional lines (high-speed lines are covered in other sections or standards).
• The standard “EN 13230-2 Part 2: Prestressed monoblock sleepers” describes additional technical criteria and control procedures for the manufacture and testing of prestressed monoblock sleepers. This standard defines the test regime and rules for the acceptance of concrete sleepers.

The main objectives of this standard are:

• To provide detailed technical specifications for prestressed monoblock sleepers (the most common type of concrete sleeper in Europe).
• Defining tolerances for dimensions, perpendicularity, flatness, and curvature.
• To specify minimum performance values ​​for:
• Positive and negative static bending moments (at the rail bed and at the center)
• Dynamic bending strength (dynamic amplification factor)
• Fatigue resistance (2-4 million load cycles depending on category)
• Rail bearing fatigue and repeated load tests
• Screw pull-out resistance and electrical resistance
• Defining traverse categories (A, B, C, D) according to maximum axle load and speed (e.g., Category A for very high-speed lines, Category D for lower-speed heavy-duty lines).
• To specify connection system compatibility and insert types.
• To define type approval tests and routine (factory production control) tests.
• It must be ensured that the sleepers meet the general requirements of the EN 13230-1 standard, but attention must also be paid to the detailed limits and test procedures specific to monoblock prestressed sleepers.
• The standard “EN 13230-3 Part 3: Double-block reinforced sleepers” describes the technical criteria and control procedures for the manufacture and testing of double-block reinforced concrete sleepers. This standard defines the test regime and acceptance rules for double-block reinforced concrete sleepers. Layout plans for test arrangements for railbed section tests are defined in this section.

The main objectives of this standard are:

• Providing detailed technical specifications only for double-block sleepers (two separate concrete blocks connected by a steel tie rod or truss). These are common in some European countries.
• Defining geometric tolerances, block shape, tie rod protection, and mounting requirements.
• To specify minimum performance values ​​for:
• Static and dynamic bending moments (rail bearing and center)
• Fatigue resistance (typically 2-4 million cycles)
• Repeated load tests on the rail bed.
• Connecting rod tensile and shear resistance
• Electrical resistance
• Defining the crossmember categories (A, B, C, D) as in the EN 13230-2 standard, depending on the axle load and maximum speed.
• To specify compatible connection systems.
• To define type approval tests and factory production control tests specific to the dual-block design.
• The general rules given in the EN 13230-1 standard must be fully complied with, but the limits and test methods must be adapted to double-block technology.
• The standard “EN 13230-4 Part 4: Prestressed supports for trusses and crossings” describes additional technical criteria, inspection procedures, and specific tolerance limits for the manufacture and testing of prestressed supports for trusses and crossings with a maximum length of 8,5 m. Supports longer than 8,5 m are considered special elements and fall under the scope of the EN 13230-5 standard.

The main objectives of this standard are:

• These include long prestressed concrete elements (typically 2,6 m to 9 m long) that replace standard sleeper groups under trusses, transitions, and expansion joints.
• This involves defining the geometric requirements and tolerances for these very long and often variable cross-section carriers.
• To specify performance requirements adapted to complex and highly asymmetric loading in shear beams:
• Positive and negative bending moments at multiple critical sections (not just the rail bed and center).
• Higher dynamic and fatigue loads
• Repeated load tests on several rail beds.
• Shear and torsional resistance (important in shears)
• In the same way as with other parts, defining the crossmember/carrier categories (again A, B, C, D) depending on axle load and speed.
• To specify compatibility requirements with multiple connection points (typically 6-14 connection points per carrier) and various scissor hitch systems.
• To define type tests and routine tests specific to the length and complexity of scissor lifts (e.g., testing at several loading points simultaneously).
• Full compliance with the general rules of the EN 13230-1 standard must be ensured, but with limits and test procedures adapted to long prestressed truss carriers.
• The standard “EN 13230-5 Part 5: Special elements” describes additional technical criteria and control procedures for the manufacture and testing of special elements.

For the purposes of this standard, a special element means any individual concrete element (excluding slabs and longitudinal beams) supporting rails in railway track construction to which this standard applies but which is not covered in other sections.

A specific element is defined by detailed drawings, including tolerances. All tolerances relating to concrete elements, rails, connection system and rail gauge, as specified in EN 13230-1 standard, are specified by the buyer. The buyer specifies the applicable positive and negative characteristic bending moments in the rail bearing section or any relevant section.

The main objectives of this standard are:

• To provide a consistent framework so that these non-standard products can still obtain the CE mark and be offered to the European market.
• To define the performance requirements (bending, fatigue, shear, repetitive loads, electrical resistance, etc.) tailored to the specific geometry and loading of each individual element.
• Allowing project-specific or system-specific designs while complying with European standards.
• Specifying type testing and factory production control procedures, generally based on methods in the EN 13230-1 standard, but applied to the specific shape and use of the particular component.
• To ensure full consistency with the general requirements of the EN 13230-1 standard.
• The standard “EN 13230-6 Part 6: Design” provides specific design guidance in the following areas:
• Derivation of characteristic loads and test loads.
• Calculation of characteristic and test bending moments.

The purpose of this standard is to provide guidance for the preparation of all data to be provided by the buyer to the supplier, in accordance with other sections. This standard applies to dimensions of 1000 mm, 1435 mm, 1668 mm and all sleeper and carrier lengths.

This standard provides specific criteria for the design of concrete sleepers and carriers as rail components. The design methods in Eurocode do not apply to these concrete elements.

All rail parameters to be considered for the design of sleepers and carriers are described in detail in this standard. This information is provided so that these parameters can be used as input in the design calculation process. It is the responsibility of the buyer to calculate or determine all rail parameters used in this standard.

This standard provides guidance for the design calculation process. It explains how experience and calculation can be combined to utilize design parameters. This standard includes mandatory and informative calculation methods that designers and manufacturers must use to demonstrate that their sleepers/carriers meet the performance requirements in other parts of this standard.

It also describes the following calculation methods:

• Design loads (static, dynamic, fatigue, impact, temperature, derailment)
• Ballast or track load distribution factors
• Dynamic magnification factors depending on speed and rail quality.
• Characteristic and design bending moments (positive and negative) at the rail bed and center.
• Shear, torsional, and longitudinal forces
• Pre-stress losses (instantaneous and time-dependent)
• Final boundary status and serviceability boundary status verifications.
• Crack width control and fatigue verification of concrete and steel.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services in accordance with the EN 13230 standard.