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JACKOUT PRESSURE CELL
VWJPC-4500 Jackout Pressure Cells are used to measure active and passive pressures on diaphragm walls during excavation. They are installed within the diaphragm wall cage to monitor pressure on the walls. Any build-up of excessive pressure can be detected in time for remedial measures to be carried out.
The Pressure Cell itself is constructed of two circular, stainless steel plates welded around their periphery. The space between the two plates is filled with an incompressible fluid. A transducer is connected to this space and measures the pressure exerted on the incompressible fluid.
Description
The cell is mounted onto one end of a double acting hydraulic ram via a swivel joint and at the other end is a reaction plate the same diameter as the cell.
The ram and cell assembly is installed into the reinforcement cage with the cell and reaction plate positioned either side of the cage with the ram passing through the reinforcement. It is loosely supported in the cage by tie wires or a prefabricated cradle.
After the reinforcement cage is lowered into the trench the hydraulic jack is hydraulically pressurised forcing the earth pressure cell and reaction plate against the sides of the trench. The hydraulic pressure is increased to ensure good embedment into the trench wall. The ram pressure is maintained throughout the pouring and curing of the concrete.
A vibrating wire piezometer can also be incorporated to measure pore water pressure.
Additional information
| Brands | |
|---|---|
| Pressure range |
3350, 700kPa; 1, 2, 3, 5 MPa |
| Over range |
150% |
| Signal output |
2000 – 3500 Hz |
| Resolution |
± 0.025% |
| Accuracy |
± 0.1% FS |
| Linearity |
<0.5% FS |
| Outer diameter |
165, 245, 320mm |
| Active diameter |
150, 230, 305mm |
| Thickness |
12.5mm |
| Cell material |
Stainless steel |
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About brand
Geosense Ltd is one of Europe’s leading manufacturers and suppliers of instruments to the geotechnical, civil engineering, mining and environmental industries.
Geosense products are used globally in major projects in more than 68 countries. With a comprehensive in-house design and manufacturing capability, we can provide products not only to tight deadlines but also to suit custom-engineered solutions for specific project requirements.
Geosense specialises in the manufacture of vibrating wire and MEMS sensors, which are used to produce a wide range of instruments. In addition we manufacture automated data acquisition systems to complement our sensors, including wireless systems.
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