{"id":347,"date":"2026-10-13T06:00:48","date_gmt":"2026-10-13T06:00:48","guid":{"rendered":"https:\/\/www.p-way.it\/?p=347"},"modified":"2026-09-29T15:25:31","modified_gmt":"2026-09-29T15:25:31","slug":"traverse-cemento-precompresso","status":"publish","type":"post","link":"https:\/\/www.p-way.it\/en\/traverse-cemento-precompresso\/","title":{"rendered":"Prestressed reinforced concrete sleepers"},"content":{"rendered":"

Under each meter of track there are, on average, little more than one and a half elements per meter that no one notices as long as it is working: the sleeper. prestressed concrete sleepers<\/strong> They have progressively replaced wood on high-traffic lines, and the reason lies entirely in a design idea \u2014 to make the concrete work only where it knows how to work, that is, in compression.<\/p>\n

\"Traverse
The sleeper connects the two rails, maintains the gauge, and distributes the loads on the ballast. The image is illustrative.<\/figcaption><\/figure>\n

What a crosspiece should do<\/h2>\n

The crosspiece performs several functions at the same time. It maintains the gauge<\/strong> constant between the two rails; transmits to the ballast the vertical, lateral and longitudinal loads it receives from the attachments; distributes the pressure over a surface large enough not to puncture the ballast; and guarantees the\u2019electrical insulation<\/strong> between the two rails, an essential condition for the functioning of the track circuits for train detection, which also depends on the insulating quality of the sleepers and fastenings.<\/p>\n

Monobloc, bibloc, wood: masses compared<\/h2>\n

There are three large families. The crossroads monoblock<\/strong> pre-stressed reinforced concrete is now the standard on main lines: a single body that typically weighs between 250 and 320 kg<\/strong>. The crossroads bibloc<\/strong> It is made up of two concrete blocks (approximately 90 kg each, ~180 kg overall) joined by a metal crosspiece, which absorbs the bending stress in the centre. The crosspiece in wood<\/strong>, lighter (80\u2013100 kg) and still irreplaceable in some contexts such as switches, however it has a shorter lifespan.<\/p>\n

A concrete sleeper is designed for a service life of over 50 years<\/strong>, against the 20\u201330 years<\/strong> typical of the treated wooden sleeper: this is the main economic reason for its diffusion on high-traffic lines.<\/p><\/blockquote>\n

\"Tipologie
Rail and sleepers on curves: the track system in service. Indicative image.<\/figcaption><\/figure>\n

Why "prestressed"\u00ab<\/h2>\n

Concrete resists compression well but tension poorly: under bending, it tends to crack at the taut edge. Prestressing solves the problem at its root. Before pouring, high-strength steel wires or strands are stretched inside the formwork; the concrete is poured around them, and once it hardens, the wires are released. The steel, as it shortens again, transfers a state of tension to the concrete. permanent compression<\/strong>.<\/p>\n

The result is that, when the passage of the train induces bending, the sleeper never enters net tension: the prestressing compression "covers" the operating tensile stress, and the cross-section remains intact without cracking. It's the same principle used to compress a row of books and lift them by their ends.<\/p>\n

\"Sezione
Rail attachment to the sleeper: the constraint that maintains the gauge and transmits loads. Illustrative image.<\/figcaption><\/figure>\n

Geometry and dimensioning according to EN 13230<\/h2>\n

The design of the monoblock crosspiece is regulated in Europe by the standard EN 13230<\/strong> (effective from October 2002; Part 2 concerns prestressed monoblock sleepers), with UIC design guide 713. Typical dimensions of a 60E1 rail sleeper are a length of 2.5\u20132.7 m<\/strong>, a rail seat width of approximately 150 mm<\/strong> and a height under the rail of the order of 233 mm<\/strong>. The distance between crosspieces in the current line is normally 600\u2013650 mm<\/strong> (of the order of 1,500\u20131,660 sleepers per kilometre), and drops towards 550\u2013600 mm on high-speed lines and on large works \u2013 such as the tunnels of the Mont Cenis Base Tunnel<\/a> \u2014 where the number per km increases correspondingly.<\/p>\n

In terms of loads, EN 13230 refers to a design load per wheel of the order of 280 kN<\/strong>, with certification tests that can go up to 440 kN<\/strong> axial load. The sizing checks the bending moments at two critical points: positive at the rail support (indicatively 28.6\u201343.3 kNm<\/strong> in the example at 347 kN of axial load) and negative at the centre of the crosspiece (of the order of 24.7 kNm<\/strong>), where the cross-section is often tapered "for life". The design life assumed by the standard is 40 years, with actual service lives much longer.<\/p>\n

\n

Sources:<\/strong> Global Railway Review \u2013 Design of Prestressed Concrete Sleepers<\/a>; BSI \u2013 EN 13230 Concrete sleepers and bearers<\/a>; Railway News \u2013 Railway sleepers: concrete vs. wood<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

The modern sleeper is a prestressed element designed to always operate under compression. Types, prestressing, geometry, and sizing criteria according to EN 13230.<\/p>","protected":false},"author":1,"featured_media":353,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[107,123,125,126,124,122,127],"class_list":["post-347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-armamento","tag-armamento-ferroviario","tag-en-13230","tag-precompressione","tag-traversa-bibloc","tag-traversa-monoblocco","tag-traverse-in-cemento-precompresso","tag-uic-713"],"yoast_head":"\nTraverse in cemento precompresso: come funzionano<\/title>\n<meta name=\"description\" content=\"Le traverse in cemento precompresso: precompressione, monoblocco vs bibloc, geometria, carichi di progetto e momenti secondo EN 13230. 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