BS 13230-4:2016 pdf download – Railway applications — Track — Concrete sleepers and bearers Part 4: Prestressed bearers for switches and crossings 1 Scope This part of the EN 13230 series defines additional technical criteria and control procedures as well as specific tolerance limits related to manufacturing and testing prestressed bearers for switches and crossings with a maximum length of 8,5 m. Bearers longer than 8,5 m are considered as special elements and are covered by EN 13230-5:2016. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 206, Concrete – Specification, performance, production and conformity EN 13230-1:2016, Railway applications – Track – Concrete sleepers and bearers – Part 1: General requirements FprEN 10138 (all parts), Prestressing steels 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13230-1:2016 and the following apply: 3.1.1 prestressed monoblock bearer bearer manufactured using pre-tensioned or post-tensioned tendons 3.1.2 characteristic positive bending moment M k,pos positive bending moment at any position of the bearer 3.1.3 characteristic negative bending moment M k,neg negative bending moment at any position of the bearer 4 Special requirement 4.1 Characteristic bending moments The bearer shall be designed with positive and negative characteristic bending moment capacities with the objective of keeping it straight. 4.2 Positioning of fastening components An area of the concrete section shall be specified by the purchaser to be free from prestressing tendons for the location of fastening components. If required by the purchaser, the design of the bearer shall provide for the repair or replacement of the embedded fastening components. 4.3 Tolerances 4.3.1 General The maximum tolerances specified in EN 13230-1:2016, 6.1 apply to concrete bearers. In case of early dimensional inspection of the concrete element, the quality plan shall take into account further shortening of the element. Measurement of tolerances shall be checked not before 48 h after transfer of prestressing forces. 4.3.2 Tolerance of planeness The maximum deviation of the total rail seat or base plate area is as follows: — planeness: 1 mm; — variation of planeness with regard to 2 points 150 mm apart: 0,5 mm. 4.3.3 Tolerances of fastening positioning The tolerances of...

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