Inverted Plumb Line SL
Application
The inclination as well as the horizontal displacement of above and below ground structures, as well as of manufacturing plants, is of decisive importance for the evaluation of their behaviour and stability. A plumb installation can act as reference axis, from which the displacements observed at different levels can give the deflection line.
The normal plumb installation can be manufactured either as a plumb line or a float line, for which the wire is fixed at its upper or lower end respectively. Depending on whether this fixture is on the structure itself or in the foundation rock, either the inclination of the structure alone, or also its displacement relative to an external reference point can be determined.
A combination of the two types of installation gives the maximum information. For a dam for instance, a plumb line anchored on the crest yield the inclination and deflection line relative to the crest, whilst a float line, or inverted pendulum, fixed deep in the foundation rock gives the movement relative to the surrounding rock.
Description
A floating pendulum system consists of the plumb reference point FP (also called plumb wire anchor point), the plumb wire LTD, the float G with float road E in the float vessel D.
For manual measuring a Coordiscope KK84 (N or D) is used. The contactless remote measuring instrument Telelot VDD2V4 can be installed for permanent surveillance.
Technical Data
| Type | SL 30-75 | SL 100-100 | SL 200-150 |
|---|---|---|---|
| Uplift | 300 N | 1000 N | 2000 N |
| Plumb wire | ø 1 mm | ø 2 mm | ø 2 mm |
| Max. wire length (C) | ~ 60 m | > 60 m | > 150 m |
| Measuring range (A) | 75 mm | 100 mm | 150 mm |
| Measurement with | B | B | B |
Legend:
A = Without moving the damping vessel
B = Coordiscope, Telelot all types
C = The maximum possible plumb wire length is mainly influenced by two factors:
1. Measuring method with or without touching the wire
2. Air current in the plumb pit or generally in the building
