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2. Ballastless track - Wikipedia

   en.wikipedia.org/wiki/Ballastless_track

   Ballastless track. A segment of ballastless track. A ballastless track or slab track is a type of railway track infrastructure in which the traditional elastic combination of ties/sleepers and ballast is replaced by a rigid construction of concrete or asphalt . Ballastless track of the type "Low Vibration Track" in a turnout in the Gotthard ...

3. Concrete sleeper - Wikipedia

   en.wikipedia.org/wiki/Concrete_sleeper

   A concrete sleeper (British English) or concrete tie (American English) is a type of railway sleeper or railroad tie made out of steel reinforced concrete. History [ edit ] In 1877, Joseph Monier , a French gardener, suggested that concrete reinforced with steel could be used for making sleepers for railway track.

4. Hold down (structural engineering) - Wikipedia

   en.wikipedia.org/wiki/Hold_down_(structural...

   A hold-down may also refer to clamping device used to anchor a pipe to a structural steel element or concrete floor or allow movement of the pipe in an axial direction. At the bottom, the hold down is connected to the concrete foundation or structural slab by an embedded or epoxied anchor bolt. At the top, the hold down is connected to a wood ...

5. Railroad tie - Wikipedia

   en.wikipedia.org/wiki/Railroad_tie

   In the background is a track with concrete ties. A railroad tie, crosstie ( American English ), railway tie ( Canadian English) or railway sleeper ( Australian and British English) is a rectangular support for the rails in railroad tracks. Usually laid perpendicular to the rails, ties transfer loads to the track ballast and subgrade, hold the ...

6. Rebar spacer - Wikipedia

   en.wikipedia.org/wiki/Rebar_spacer

   Rebar spacer. A concrete spacer with a plastic clip in use on the side of the formwork. A rebar spacer is a short, rod-like device used to secure reinforcing steel bars, or rebar, within cast assemblies for reinforced concrete structures. The rebar spacers are fixed before the concrete is poured and remain within structure.

7. Formwork - Wikipedia

   en.wikipedia.org/wiki/Formwork

   Fabric formwork is a small niche in concrete technology. It uses soft, flexible materials as formwork against the fresh concrete, normally with some sort of strong tension textile or plastic material. The International Society of Fabric Forming conducts research on fabric formwork.