Drilling to find a suitable deposit for nuclear waste in the Swedish bedrock
The Swedish Board for Handling of Nuclear Material, ( SKB ) is investigating a number of sites for a possible deposit of the nuclear waste generated by the Swedish nuclear power plants.
Both DTH hammer drilling and diamond coring is used. Along with all drilling activities, a substantial program for monitoring the ground water is performed. All diamond corings are equipped with data logging and the two drill-rigs operated by SAAB, Sven Andersson i Uppsala AB for DTH drillings down to approx. 250 meters are instrumented with D-mon data loggers from Envi.
In addition to the usual drilling parameters: Rate of penetration, Torque, r.p.m., Bit load and Air pressure, the Volume of the returning water from the borehole is being measured. All readings are carefully sampled with time.
| The D-mon data loggers are
installed on the drill-rigs in two different ways. The smaller NEMEC 710 has the D-mon mounted directly on the operating panel. The bigger COMACCHIO 1500 has the D-mon mounted on the side panel of the operating canopy. Note that in this case, the D-mon has been split up in 3 different units in order to save space. ( Right picture) |
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Soil Improvement by Deep Cement Mixing
Deep cement mixed piles are being used for a bridge foundation in Bangkok
The foundation work of a new bridge over the Chao Phraya River is being managed by the Siam Soil co. for CISCO.
For the job, both 1, 2 and 3 head machines were in operation. D -mon data loggers were installed in each machine for the logging of: depth, rpm, cement flow and cement pressure. Data are collected during the mixing and are stored in the internal memory of the D -mon. Every day, the data are downloaded on a disk and brought to the site office.
In each cement line, a magnetic type flow - meter was installed in
order to measure the flow and total volume of cement that was injected.
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