Quality Control
While in a land based operation a stone column can be assessed with load tests, or a borehole can be drilled into the column to check for continuity, such controls are not readily available under water.
When recording only Ampere and depth information there is no control to ensure that gravel is placed at the required location. Problems such as blockage of the gravel transport tube or loss of gravel on the sea bed may not be detected.This danger does not exist in a land based operation, where excessive spillage of gravel on the surface can be visually controlled.
Traditional data loggers are not able to generate the data required to provide adequate control. However, a new data logging method has now been developed which produces an output showing the stone column diameter, measured from
The actual placed volume of stones at the respective depth. An example of such an output is presented on the right.On the graph to the right the stone column diameter is plotted against depth. This is accomplished by the computer through a recording of the time and depth when each gravel batch has been sent through the Double Lock mechanism.
Geotechnical contractor , Soil Improvement
Soil Improvement (Vibro Compaction / Stone Columns) ,(Design and Build)
all types of bored and driven piling works , all types of shoring works ,Soldier Pile Shoring ,
Secant Wall , Diaphragm Wall , Contiguous Wall , Soldier Piles ,Sheet Piles , Steel H-Beams, Shoring Plates
Micro Piles and Ground Anchors
Marine Works:Sheet piling of Cofferdams ,Jetties, Wharves