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Term Definition
Press weld
Brand name of an air-activated concrete placer.
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.
Preventive measures
Measures that are undertaken in order to avoid an environmental impact.
Price / Cost
Sum effectively spent to obtain marketable good
Primary lining
The tunnel lining placed to support the ground as the excavation proceeds.
Profitable
One says this of a project that yields in total more benefits than costs. It is usually applied to financial returns.
Property division
Legal division of real-estate
Provisions
A measure taken beforehand / stipulation
Psychological issues
Issues pertaining to a person?s mental state or response
Public domain
An area of information, knowledge or physical space that is considered owned by the public and accessible by all
Public right-of-way
Land area owned, held or secured by a public agency for transportation purposes
Pull
The length of rock broken when a round is fired at the face.
Pumped Sand Foundation
See : Sand Bedding
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.
Qualitative
Based on judgement rather than numerical analysis
Quantitative
Based on numerical analysis
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.
Rackers
Support timbers placed at an angle.
Raise
To excavate a shaft upwards, in distinction from sinking.
Raise
A vertical or inclined shaft driven upward from an underground opening, most frequently to connect with another underground opening or the surface.