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Rod Extensometer Double Point
Rod Extensometer Double Point
Rod Extensometer Single Point Rod Extensometers Single (left) and Double (right) Point

ROD EXTENSOMETERS SINGLE + DOUBLE POINT

CATEGORY > Extensometers + Compressometers

ROD EXTENSOMETERS SINGLE + DOUBLE POINT

DESCRIPTION

The behavior and stability of soil and rock masses can be determined using borehole extensometers. A typical borehole extensometer consists of a reference head, usually installed at the collar of a drill hole, and one or more in-hole anchors, each of which is fixed in place at a known depth in the bore hole. As the rock or soil deforms, the distances between adjacent in-hole anchors change, as do the distances between the individual in-hole anchors and the reference head. These changes are measured, and the resulting data used to compute the distribution, magnitude, rate and acceleration of deformation in the rock or soil mass intersected by the extensometer drill hole.

The Single Point Model EX-1 is an inexpensive, simple, rugged, and reliable device to monitor deformation in under ground workings such as chambers, tunnels, mine galleries and mine excavations. The entire instrument is recessed in the borehole, providing maximum protection against mechanical damage. In situations where boreholes may be easily drilled, it may be preferable to install several EX-1 extensometers rather than a multiposition extensometer.

Deformation measurement is accomplished by using either an analog or digital depth indicator to measure the position of the rod tip relative to the collar anchor reference surface.

The Double Point Model EX-2 is similar to the Single Point EX-1 although two anchors are employed. The use of two points allows the engineer to distinguish between dangerous deep seated movements and more trivial surficial spalling.

The extensometer assembly consists of modified expanding shell rockbolt anchors set with a socket wrench. The downhole anchor is connected to a 1/4 inch rod which moves inside the uphole anchor’s 1/2 inch pipe. Both anchor rods terminate in the collar anchor, which is set in the mouth of the borehole. Anchor position is measured with either an analog or digital depth indicator to measure the position of each rod tip relative to the collar anchor reference surface.

QUICK SPECS

Accurate and reliable.


Rugged.


Easy to install and simple to operate.


Low cost.


Recoverable.

APPLICATIONS

Used to determine the behaviour and stability of soil and rock masses.

BENEFITS

Increase Productivity


High Accuracy


High Reliability

DESCRIPTION

The behavior and stability of soil and rock masses can be determined using borehole extensometers. A typical borehole extensometer consists of a reference head, usually installed at the collar of a drill hole, and one or more in-hole anchors, each of which is fixed in place at a known depth in the bore hole. As the rock or soil deforms, the distances between adjacent in-hole anchors change, as do the distances between the individual in-hole anchors and the reference head. These changes are measured, and the resulting data used to compute the distribution, magnitude, rate and acceleration of deformation in the rock or soil mass intersected by the extensometer drill hole.

The Single Point Model EX-1 is an inexpensive, simple, rugged, and reliable device to monitor deformation in under ground workings such as chambers, tunnels, mine galleries and mine excavations. The entire instrument is recessed in the borehole, providing maximum protection against mechanical damage. In situations where boreholes may be easily drilled, it may be preferable to install several EX-1 extensometers rather than a multiposition extensometer.

Deformation measurement is accomplished by using either an analog or digital depth indicator to measure the position of the rod tip relative to the collar anchor reference surface.

The Double Point Model EX-2 is similar to the Single Point EX-1 although two anchors are employed. The use of two points allows the engineer to distinguish between dangerous deep seated movements and more trivial surficial spalling.

The extensometer assembly consists of modified expanding shell rockbolt anchors set with a socket wrench. The downhole anchor is connected to a 1/4 inch rod which moves inside the uphole anchor’s 1/2 inch pipe. Both anchor rods terminate in the collar anchor, which is set in the mouth of the borehole. Anchor position is measured with either an analog or digital depth indicator to measure the position of each rod tip relative to the collar anchor reference surface.

QUICK SPECS

Accurate and reliable.


Rugged.


Easy to install and simple to operate.


Low cost.


Recoverable.

APPLICATIONS

Used to determine the behaviour and stability of soil and rock masses.

BENEFITS

Increase Productivity


High Accuracy


High Reliability

CONTACT US

RST Instruments Ltd.

11545 Kingston Street
Maple Ridge, BC
Canada V2X 0Z5

604-540-1100

1-800-665-5599

Fax: 604-540-1005

info@rstinstruments.com

CONNECT WITH RST

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ASK A QUESTION

CONTACT US

RST Instruments Ltd.

11545 Kingston Street
Maple Ridge, BC
Canada V2X 0Z5

604-540-1100

1-800-665-5599

Fax: 604-540-1005

info@rstinstruments.com



CONNECT WITH RST

Linkedin icon
Youtube icon

ASK A QUESTION

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