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Magnetic Extensometer GXM Range


 
The GEO-XM settlement system is a magnet extensometer system used typically to monitor settlement and heave in foundations, excavations and embankments.
 
Data received identifies the depth and position where settlement has occurred as well as the total amount of settlement.
 
It can also be installed behind retaining structures, such as sheet piles and slurry walls, and above underground openings, such as tunnels and shafts.

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Descriptions

The system comprises a central access tube along which magnetic targets are positioned at various locations. Settlement is measured by the relative position of the magnetic targets using a Reed Switch Probe lowered down through the central access casing.
 
There are several variations to suit individual applications:

  • GXM-100 Central access tubing and spider magnets for use in boreholes
  • GXM-100 Central access tubing and settlement plates for use in fill
  • GXM-100T Central access tubing with telescopic joints for larger movement
  • GXM-200 Combined settlement/heave and inclination using inclinometer casing as the access tubing with spider magnets
  • GXM-200P Combined settlement/heave and inclination using inclinometer casing as the access tubing with settlement plates
  • GXM-200T Combined settlement/heave and inclination using inclinometer casing with telescopic joints for larger movement
  • GXM-300 Central access tubing de-bonded by an outer corrugated pipe with magnetic targets
  • GXM-300i Combined settlement/heave and inclination using inclinometer casing as the access tubing de-bonded by an outer corrugated pipe with magnetic targets

Case Studies

Jakarta Mass Rapid Rail Transport, Phase 1, CP104/5

The CP104 and CP105 construction sections include a total of 3.89 kms of 6.05m twin tube tunnelling, four underground stations – Senayan, Istora, Bendungan Hilir, and Setiabudi – and a cut-and-cover transition structure of almost 500m in length to connect the below and above ground sections.
 
Two special challenges were posed by this project: It was Indonesia’s first shield tunnel construction and the construction of underground stations using the cut-and-cover and top-down method on Sudirman Street, a major street consisting of 12 lanes.
 
Diaphragm walls were installed to form the station boxes followed by excavation and construction of the slabs from roof downwards as excavation progressed.
 
Entrances and ventilation shafts were constructed using bottom up construction method and steel struts and walers used to prop open the excavation.
 
Jakarta Mass Rapid Rail Transport, Phase 1, CP104/5 Case Study

Downloads

Magnetic Extensometer GXM 100 Series Manual
 
Magnetic Extensometer GXM 300 Series Manual
 
Magnetic Extensometer GXM Range Datasheet

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Malaysia
  • D-20-06, Sunway Nexis,
    Kota Damansara,
    47810 Petaling Jaya,
    Selangor, Malaysia.
  • +603.7611.7676
  • +6012.6945.333
  • info@mitssolutions.asia
Vietnam
  • 8TH FLOOR, 01 Dao Duy Anh
    Ocean Park Building,
    Phuong Mai, Dong Da, HANOI.
  • +8491.228.7676
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