Term | Definition |
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Press weld |
Brand name of an air-activated concrete placer.
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Prestress, Temporary |
Used mainly in concrete tunnels to temporarily lock a flexible joint, to modify stresses until immersion, or to provide additional strength during transportation and installation.
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Preventive measures |
Measures that are undertaken in order to avoid an environmental impact.
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Price / Cost |
Sum effectively spent to obtain marketable good
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Primary lining |
The tunnel lining placed to support the ground as the excavation proceeds.
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Profitable |
One says this of a project that yields in total more benefits than costs. It is usually applied to financial returns.
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Property division |
Legal division of real-estate
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Provisions |
A measure taken beforehand / stipulation
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Psychological issues |
Issues pertaining to a person?s mental state or response
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Public domain |
An area of information, knowledge or physical space that is considered owned by the public and accessible by all
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Public right-of-way |
Land area owned, held or secured by a public agency for transportation purposes
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Pull |
The length of rock broken when a round is fired at the face.
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Pumped Sand Foundation |
See : Sand Bedding
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Pyramid cut |
A method of blasting in tunnelling or shaft sinking in which the holes of the central ring (cut holes) outline a pyramid, their toes being closer together than their collars.
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Qualitative |
Based on judgement rather than numerical analysis
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Quantitative |
Based on numerical analysis
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Quarter arch points |
Those areas between the tunnel crown and springline covering approximately the spread from the 1:00 to 2:00 o'clock and the 10:00 to 11:00 o'clock positions.
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Rackers |
Support timbers placed at an angle.
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Raise |
To excavate a shaft upwards, in distinction from sinking.
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Raise |
A vertical or inclined shaft driven upward from an underground opening, most frequently to connect with another underground opening or the surface.
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