OTDR
Fiber Optic Splicing Machine
Optical Loss Test
Optical Power Meters
Optical Light Source
TDR Cable Fault Locator
Fiber Optic Visual Fault Locators
Network Analyzer
Lan Testers
Fiber Tools
Fiber Cleavers
Optical Fiber Identifier
Fiber Optical Attenuator
Tone & Probe Kit
Fiber Optical Talk Set
Rocoil Rail Current Transducer
Bit Error Rate Tester
|
Sisgeo’s Fixed Extensometer is a single‑rod settlement/heave measurement device, installed either in embankment fill or boreholes. It provides direct deformation tracking between two fixed points without requiring a removable probe. Two primary versions include:
· A galvanised‑steel riser rod, anchored at the bottom (plate in soft ground or grouted in borehole), extends upward through a corrugated sheath. · Ground movement shifts the rod; measurements are taken by optical levelling to a survey pin on the top head. Sliding caps minimize friction.
· Same mechanical setup as above but integrates a DTM displacement transducer within the top head. · Offers continuous remote monitoring via a 4–20 mA output, ±0.15 % FS accuracy, IP68 protection, and measurement ranges of 250, 500, or 1000 mm Typically, the user should select bill of materials based on deployment scenario: 1. Measuring Rod (Riser Rod): 25 mm outer diameter, 2000 mm long galvanized steel rod with M25 threaded ends. Transmits movement from anchor to top head. 2. Anchor / Settlement Plate: Bottom anchoring element. “Spider” type for boreholes or 500×500 mm flat steel plate for embankments/soft soils. Ensures deep ground reference. 3. Measuring Head (Manual) Top-end housing with stainless steel survey pin for optical levelling reference. Used in Tell-Tale version. 4. Measuring Head (Electrical): Protective head housing the displacement transducer. Weatherproof and supports permanent installations. 5. DTM Displacement Transducer: High-accuracy linear transducer with 4–20 mA output. Measurement ranges: 250-, 500-, or 1000-mm. Accuracy ±0.15% FS, repeatability <0.08 mm. IP68-rated. Used in automatic systems. 6. Corrugated Sheath (PVC): 55 mm OD corrugated PVC tube enclosing the riser rod. Allows free vertical movement, minimizes drag/friction. Typically supplied in rolls. 7. Sliding Caps: Low-friction plastic elements placed inside the sheath to isolate the riser rod and prevent soil drag (“downdrag”). Applications of Fixed Extensometers: · Embankment and Earth Fill Monitoring: Detects settlement of soil layers after placement of new fill or during construction of embankments for highways, railways, or levees. · Dams and Levees: Measures long-term consolidation of core or embankment material in dams and levees. · Transportation Infrastructure: Monitors subsidence or heave under highways, railways, and airport runways. · Landslide and Slope Stability Monitoring: Detects vertical movement related to deeper slip surfaces or subsidence zones in slopes. · Excavation and Tunnelling Impact Studies: Assesses how underground excavation (e.g., tunnelling or shaft sinking) affects nearby soil or structure settlement. · Structural Foundation Monitoring: Tracks building or bridge foundation settlement or heave, especially in variable or reactive soils. · Ground Improvement and Soil Treatment Validation: Verifies the effectiveness of ground improvement techniques such as preloading, vertical drains, stone columns, or deep mixing. |
.png)
.jpg)
.png)
.png)
.png)
.png)
.png)
.jpg)