Description
The VW rock bolt stressmeter is an instrument for verifying the rock bolt construction appropriateness (effective length, yield and stress) by accurately measuring the axial force transmitted by R/B. It is designed for accurate measurement of the axial force applied to the rock bolt to be constructed for the rock reinforcement at construction sites such as tunnel, mining, hangars and cable tunnel.
Composition & Characteristic
▣ Components
① R/B Stressmeter sensor
② Cable
▣ Features
The inside of the body is equipped with a VR sensor that is adjusted to about 1,800Hz. The rock bolt anchor is made of steel for high carbon piping with an inner diameter of Ø16.2 × outer diameter of Ø27.2mm, so that it can be installed easily at inner diameter Ø38mm, the borehole size in tunnel.
Specification
| Model Name | SJ-1200 |
|---|---|
| Sensor part | Sensor applied: V/W Sensor (VW Type) |
| Measurement range: 1,400 ~ 3,500Hz (170kN) | |
| Measurement band: Min 1,000 ~ Max 4,000με (±125kN) | |
| Resolution: 0.1με | |
| Accuracy: 0.85kN | |
| Linearity error tolerance: ±0.5% FSR | |
| Coefficient of expansion: 11 × 10⁻⁶/°C | |
| Working Temp.: -40°C ~ 80°C | |
| Temp sensor working range: Thermistor: -40 ~ 80°C | |
| Temp sensor accuracy | Thermistor: ±1°C |
| Number of measurement point | 4 Points |
| Minimum drilling diameter | ø38mm or above |
| Anchor nominal dimension | Inside Dia. ø16.2 × Outside Dia. ø27.2mm |
| Anchor cross section | 374.95mm² |
| V/W gauge effective load | Approx. 15 ton·f |
| Anchor elastic modulus / Yield point | 2.1 × 10⁴ / dir 17 ton·f (In case of elastic limit 4,500 kg/cm²) |
| Anchor material | High carbon steel pipe steel (Coating) |
| Signal cable | ø10mm, 0.235mm² × 8C Shielded PVC Sheath Cable 3m |
| Components | Description | 4m | |
|---|---|---|---|
| A | Cable | Product size | Gauge length (mm): 1,000 |
| B | Connector | Housing dia. (mm): 33 | |
| C | Head | Pipe dia. (mm): 27 | |
| D | Housing | Weight (kg): 9.5 | |
| E | Sensor | ||
| F | End Cover |