- Products
- AXILOG II vibration monitoring system
- BGCMAP rate of corrosion tester
- Dynasen shock pressure sensor products
- Foundation integrity testing products
- Foundation load testing products
- PARAS parallel seismic test system
- PLATEMAN plate load tester
- SB2010 large scale shear box
- SCXT3000 cross hole sonic logging system
- Signal Lever Force Indicator (SLFI)
- SPTMAN hammer energy tester
- TDR2-S concrete slab tester
- Measurement and control
- Monitoring
- Smart Asset Management System™
- Bridge monitoring
- Building monitoring
- Rail monitoring
- Tunnel monitoring
- Wind turbine monitoring
- Request a demonstration
- Bridge crack monitoring
- Bridge strike monitoring
- Bridge deflection and displacement
- Bridge load testing
- Hidden bridge defect detection
- Over-height vehicle detection
- Scaffold and ladder testing
- Barrier and balustrade testing
- Commercial shelving and display unit testing
- Below ground corrosion assessment
- Bi-directional static load testing
- Cross hole sonic logging
- Dynamic pile testing
- Parallel seismic testing
- Pile integrity testing
- Static load testing
- Bituminous materials testing
- Chemical testing
- Concrete material testing
- Plate load testing
- Pyrite investigation and testing
- Soils and aggregate testing
- Specialist testing
- Coring and pavement analysis
- Falling weight deflectometer
- Radar surveys
- Utility reinstatement testing
- Corrosion surveys
- In-situ concrete testing
- Structure condition surveys
- Wind farm noise assessment
- Bridge bearing condition services
Parallel seismic testing
Parallel seismic testing by JFTS is regarded as the only reliable method of checking the durability of foundations beneath existing structures.
Occasionally doubts about the integrity and length of concrete and sheet piling, only arises after the structure is complete and pile heads are no longer accessible for testing.
The parallel seismic test has been developed for testing in these situations and is often used to determine the embedded depth of sheet piling, confirmation of pile depth underneath caps and structures, as well as checking the depth of masonry and footings.
Parallel seismic testing methodology
The parallel seismic test works by measuring the time taken for a signal to travel from the top of the pile, to a transducer inside the access tube alongside the pile.
The system hydrophone is lowered down the tube and every 500 millimetres the side of the pile or structure is struck, and the resultant signal from the moment of impact is recorded.
As the hydrophone descends, the rate of increase in signal arrival time will increase. The depth of the foundation is determined by the depth the rate of first arrival changes.
