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Tyre Chains

An assembly of chain links which is fitted around pneumatic tyres on mobile plant, especially articulated wheeled loaders, to protect the tyre from damage.

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Tyre chains

Type 2

A specification for granular material used as sub-base, as defined by the Specification for Highway Works clause 804. Type 2 materials include crushed rock, crushed slag, crushed concrete, well-burnt non-plastic shale, and natural sand and gravels.

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Type 1

A specification for granular materials used as sub-base, as defined by the Specification for Highway Works, clause 803. Type 1 materials include crushed rock, crushed slag, crushed concrete and well-burnt, non-plastic shale - but sand and gravels are excluded.

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Trench Arisings

Material from the excavation of roads when undertaking utility works. The material will include bound materials, such as asphalt, and may include unbound granular materials, such as sub-base, clay and soil.

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True Dip

The maximum angle, measured in a vertical plane, between the plane of the stratum and the horizontal. The vertical section containing the full dip is at right angles to the line of strike. 

Also: full dip

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Two-stroke Cycle

An internal combustion engine cycle completed in two piston strokes, the charge being introduced into the cylinder, compressed, expanded and exhausted through ports in the cylinder wall, before and during the introduction of the fresh charge. Every downward stroke generates power.

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