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| Description |
Rock borehole pressuremeter is attached bearing plate of jack to measure the contraction and expansion for the displacement of borehole wall pressured by a hollow wall.
This jack is located in appointed location of Hole connected such as Drill rod of NX bearing machine for hydraulic lines and signal cable.
When applied hydraulic to manual pump, the jack’s bearing plate will expansion and the borehole will attached to borehole wall.
Jack has 2 LVDT (Linear Variable Differential Transformers) to measure the displacement deviation of Rock. Display readout (GJ-75R) for displacement sensor connected to signal cable.
Approval pressure is able to read the pressure by attached hydraulic pressure gauge to manual pump. After measuring, when operates dissolution valve, the pressure will cancel and the bearing plate will return as original. Take off from borehole and separation with Drill rod.
Jack of Rock borehole pressuremeter is selected by geological survey investigated in advance. Usually, the Jack for hardrock is used.
Jack for softrock is useful for testing properties of softrock, soil and petrified clay.
Jack of GJ-75 is waterproofed and is designed to endure the pressure of about 10000psi.
Indicator GJ-75R was waterproofed and it was processed to defend noise. So it can be used at the wrong site. And it has a charge and discharge battery.
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| Specifications |
| Model |
GJ-75 |
Displacement
output Readout
(GJ-75R) |
Indication |
Dual digital LCD (3 Digit) |
| Operating time |
10 Hours continuous (When fully charged) |
| Power |
12 VDC |
| Resolution |
0.01 mm |
| Weight |
Approximately 4.5 kg |
| Material |
Aluminum frame, Waterproofing |
| Dimension |
320 × 230 × 230(H)mm |
Hard rock Jack
(GJ-75H) |
Number of piston |
12 EA |
| Maximum pressurized |
654 kg/cm² (9300psi) |
| Linear |
Maximum |
± 0.5% 73.7~78.7 mm interval |
| Minimum |
± 0.1% 72.4~80 mm interval |
| Boring diameter |
Maximum |
83 mm |
| Minimum |
70 mm |
| Maximum oil-pressurized |
703 kg/cm² (10000 psi) |
| Operating temperature |
- 22 ~ 60 ℃ |
| Material |
Stainless steel |
| Case material |
Aluminum |
| Dimension |
ф 70 ⅹ 445 mm |
| Weight |
14.5 kg |
Soft rock Jack
(GJ-75S) |
Number of piston |
3 EA |
| Maximum pressurized |
390kg/cm² (5540 psi) |
| Linear |
Maximum |
± 0.5% 73.7~78.7 mm interval |
| Minimum |
± 0.1% 72.4~80 mm interval |
| Boring diameter |
Maximum |
83 mm |
| Minimum |
70 mm |
| Maximum oil-pressurized |
703kg/cm² (10000 psi) |
| Operating temperature |
- 22 ~ 60 ℃ |
| Dimension |
ф 70 ⅹ 445 mm |
| Material |
Stainless steel |
| Case material |
Aluminum |
| Weight |
14.5 kg |
Hand pump
(GJ-75P) |
Manufacture company |
Korea Hydraulic Co - Model. EPA-702 |
| Maximum allowable pressure |
703kg/cm² (10000 psi) |
| Pressure gage resolution |
20kg/cm² |
| Accuracy |
± 0.5％ FSR |
| Dimension |
690 ⅹ 180 ⅹ 150 mm |
| Material |
Duralumin |
| Case material |
Aluminum |
| Weight |
9 kg |
| Hydraulic Hose |
Maximum pressurized |
703kg/cm² (10000 psi) |
| Weight |
Standard : 8 kg / 15 m, Optional : 20m, 30m, 40m |
| Signal cable |
Dimension |
Shield, 4C × 0.75mm² × ф10mm P.U cable
Adhesion MS connecter at the both ends |
| Weight |
Standard : 2 kg / 15 m, Optional : 20m, 30m, 40m |
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