Rod Extensometer for Settlement Monitoring

Merek : Slope Indicator - USA

Aplikasi :

Rod Extensometer digunakan untuk monitoring penurunan pada Pondasi, timbunan, bagian atas Tunnel, pergerakan struktur penahan, dan deformasi dibawah tanah.

Prinsip Operasi :

Komponen rod Extensometer termasuk angkur, batang, pipa pelindung, dan kepala referensi.

Angkur dipasang pada batang dan di pasang pada lubang bor. Batang perpanjangan di pasangan sejauh dari reference head sampai pada angkur.

Pipa pelindung dipasang untuk mencegah runtuhan grouting pada saat pengisian.

Readings are obtained at the reference head by measuring the distance between the top (near end) of the rod and a reference surface. A change in this distance indicates that movement has occurred.

Movements are referenced to a stable elevation, typically a downhole anchor. The resulting data can be used to determine the zone, rate, and acceleration of movements, and to calculate strain.

Anchors
Groutable anchors are suitable for most applications. The hydraulic anchor is used in soft soil.

Rods
Rods are fiberglass or stainless steel. Fiberglass rod extensometers are assembled at the factory and shipped to the site, ready to install.
The flexibility of these extensometers also makes them easier to install in confined areas, such as tunnels. Stainless steel rod extensometers are
assembled on site. However, their stiffer rods can be used for deeper anchor depths.

Reference Heads
Mechanical reference heads can be used when there is easy access to the extensometer. Measurements are obtained with a depth micrometer.
Electric reference heads are used when access to the reference head is difficult or where continuous monitoring is required. Measurements are
obtained with displacement sensors and a readout or data logger.

PERFORMANCE NOTES
System Accuracy: The main variables in system accuracy are site conditions and the quality of the installation. In general, the best performance
is achieved when the borehole is straight and rods are held in tension to keep them straight while the grout backfill cures.
Maximum Recommended Rod Length: In general, rods in tension can be longer than rods in compression, and steel rods can be longer
than fiberglass rods. In non-vertical installations, friction between rods and the protective pipe becomes a limiting factor. The table below suggests
maximum lengths for rods in tension and compression.

Number of Monitored Points: The rod extensometer can monitor up to six points. In practice, the number of monitored points is limited by the
size of the borehole, the type of anchor used, the diameter of the protective pipe, and the amount of tubing required for activating anchors and
grouting. A 76 mm (3") borehole will accommodate six groutable or hydraulic anchors







Price : Call For Info
Informasi Produk :
Yudhistira
Kategory : Alat Ukur Tahanan Tanah, ekstensometer, extensometer
Alat Ukur Tanah