Rockmeter RME/TRME
Application
Single or multirod extensometer (Rockmeter) to measure displacements and deformations in dams, foundations, embankments, slopes, tunnels, bridges a.s.o.
Description
Displacements along a borehole axis can be determined with the rockmeter. Rigs consisting of several single rods are protected and sheated in plastic tubes. The pointed ends are anchored on several levels in boreholes.
The slim rockmeter head is grouted in the borehole. The anchors at one end of the rods and the head of the rockmeter are the fixpoints between the sections. The relative movement between the fixpoints are measured.
The borehole has to be 1 m longer than the longest rod. Towards the end, closed to the borehole opening, 0.5 m must be enlarged to approx. ø 120 mm.
The rockmeter is not depending on position. It can be installed at any inclination. The rod lengths of the rockmeters can be more than 80 m.
All instrument parts are made of stainless steel. The instrument is very solid and made for short- as well as for longterm applications even under rough environmental conditions. The measuring head is not sensible to any water entries. After complete installation, the space between the protective tube and the borehole wall is filled by grout. Herewith a perfect anchorage of the rods is achieved. This is a basic requirement for a precise and secure measuring of the displacement. Displacements are measured either with Setdeflectometers (manually) or by using the fix mounted electrical transducers (automatically).
Rockmeters can be equipped with 1 to 6 rods in the same borehole (more than 6 rods on request). The rods can have different lengths, depending on the conditions. With the multirod rockmeter it can be located in which depth there are displacements. This is important for instance when determining the installation depth of prestressed anchors.
If major changes in temperature are to be expected in the surroundings of the rockmeter rig, thermometers can be installed in the borehole (e.g. HUGGENBERGER Telethermeters). By them the temperature influenced changing in lengths can be corrected accordingly.
Technical Data
| Type | RME | RME | TRME |
|---|---|---|---|
| Installation | not depending on position, can be installed in any inclination | not depending on position, can be installed in any inclination | not depending on position, can be installed in any inclination |
| Measuring head | RME1 ø 30 mm RME2/3/4 ø 60 mm RME5/6 ø 80 mm |
RME1 ø 30 mm RME2/3/4 ø 60 mm RME5/6 ø 80 mm |
TRME1 ø 30 mm TRME2/3/4 ø 60 mm TRME5/6 ø 80 mm |
| Measuring points | 1-6 anchors per borehole | 1-6 anchors per borehole | 1-6 anchors per borehole |
| Length of rods | ~80 m | ~80 m | ~80 m |
| Measuring range | ±25 mm, adjustable ±25 mm |
±25 mm, adjustable ±25 mm |
±25 mm, adjustable ±25 mm |
| Reading | Setdeflectometer RDM/ERDM | RDT | Indipoc µP20, Tensologger TL |
| Resolution | 0.01 mm | 0.03 mm | 0.01 mm |
| Electrical transducer | — | — | Linear potentiometric transducer TE1 |
| Borehole diameter | RME1/2 ø 56 mm RME3/4 ø 66 mm RME5/6 ø 76 mm |
RME1/2 ø 56 mm RME3/4 ø 66 mm RME5/6 ø 76 mm |
TRME1/2 ø 56 mm TRME3/4 ø 66 mm TRME5/6 ø 76 mm |
Important notice:
1. The borehole should be 1 m longer than the longest rod.
2. Towards the end, closed to the borehole opening, 0.5 m must be enlarged to approx. ø 120 mm.
