Site investigation | Continuous data collection of deep support layers in a narrow steel building with delivery restrictions.
Boring survey
Perfect for bowling alternatives! Even in narrow steel buildings with delivery restrictions, continuous data collection of deep support layers can be achieved with automatic ram sounding tests.
In the construction of steel frame buildings on narrow sites, it is often difficult to conduct standard penetration tests due to narrow access routes, high costs, and the need for large occupied spaces. GeoTech's "Automatic Ram Sounding Test" employs an ultra-compact self-propelled machine with a width of only 830 mm, allowing for easy access even in urban sites with strict delivery restrictions. The fully automated impact penetration device can break through strata with an N value of 30 or more, which cannot be evaluated by SWS tests, and continuously collects data in 200 mm increments up to a depth of 30 m. By measuring the number of penetration blows and simultaneously measuring the rotational torque, it automatically corrects for the effects of side friction, allowing for the calculation of high-precision data that has a strong correlation with the N value from standard penetration tests. While maintaining data accuracy comparable to boring, it significantly reduces equipment setup and working time, enabling cost-effective identification of bearing layers. Additionally, its ease of use for multi-point investigations proves effective in understanding strata inclinations and localized soft layers, supporting safe and rational pile foundation design.
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basic information
The fully automatic automatic ram sounding testing machine (Model: YBM CRS-12) will be used for the testing. The dimensions of the device are width 830 mm to 1000 mm, length 2350 mm, height 2570 mm, and it has a weight of 1630 kg, making it transportable by a 2-ton unic truck. A hammer with a mass of 63.5 kg will be dropped from a free fall height of 500 mm, and the number of impacts (Ndm) at increments of 200 mm penetration and the rotational torque (Mv) will be automatically recorded. The maximum measurement depth is approximately 30 m below the surface, and the torque values will be automatically corrected for circumferential friction resistance, deriving a converted N value with reliability equivalent to that of a standard penetration test.
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Applications/Examples of results
It is ideal for new foundation surveys of steel frame buildings, mid-rise apartments, and commercial facilities in narrow sites where large boring equipment cannot enter. It is used to accurately determine the depth of the bearing layer in ground reinforcement methods such as small-diameter steel pipe piles, and to prevent excessive design during pile length selection. Additionally, through the analysis of continuous impact data, it allows for a three-dimensional understanding of stratification and geological changes, functioning as a safety verification method to prevent differential settlement accidents and as an advanced supplementary survey technique in construction sites that aim to reduce the high costs of boring surveys.
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