Continuous measurement up to N value 50. Optimal ground investigation for confirming the bearing layer of steel pipe piles.
This is a dynamic cone penetration test service that can obtain high-precision and continuous data as a complement to standard penetration tests and SWS tests. It addresses strata with N values exceeding 30, which are difficult to measure in SWS tests, and boasts excellent penetration capability of up to around N value 50. The main feature is the ability to obtain continuous data (Nd values) every 200 mm. By measuring the rod's rotational torque and automatically correcting for the effects of side friction, it calculates reliable data that correlates almost 1:1 with the N values of standard penetration tests (Nd = N), enabling accurate determination of bearing layers.
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basic information
This is the specification for an automatic continuous penetration device using the geological survey machine "CRS-12." It performs impact penetration by automatically dropping a hammer weighing 63.5 kg from a height of 500 mm at a rate of 22 times per minute onto a rod equipped with a cone with a tip angle of 90 degrees and an outer diameter of 45 mm. It supports automatic measurement to a depth of approximately 30 m, and data can be verified on-site. It is equipped with a hydraulic system that has a maximum pull-out force of 39.2 kN and a maximum rotational torque of 440 N·m. The dimensions of the unit are 2,350 × 830 (1,000 when expanded) × 2,570 mm, and it has a mass of 1,630 kg, making it a compact self-propelled crawler. As deliverables, a survey report including topographic maps and continuous test records will be provided.
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Applications/Examples of results
It is ideal for ground investigations of small-scale buildings, confirming reliable support layers in steel pipe pile methods, and supplementary investigations for boring and SWS tests. As a case in point, there is an example where, while maintaining excellent cost performance compared to boring investigations, the SWS test successfully penetrated a hard stratum with an N value exceeding 30, which is difficult to penetrate, and accurately identified continuous ground strength (Nd value) up to a depth of 30 meters. By employing a compact self-propelled machine that can be deformed to a width of 830mm, there is a wealth of experience in quickly and efficiently completing measurements even in limited small spaces, such as narrow sites where large heavy machinery cannot enter or gaps between adjacent buildings.
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