| 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.
|
