Ground investigation | Ground investigation to confirm the bearing layer in a narrow steel building with transportation restrictions.
Ground investigation
Perfect for alternatives to boring! We reliably confirm deep support layers through automatic ram sounding tests in steel frame buildings with limited access on narrow sites.
When constructing a steel frame building on a small site in an urban area, traditional boring standard penetration tests often face challenges such as securing installation space, high investigation costs, and long temporary periods, making their implementation difficult in many cases. GeoTech's "Automatic Ram Sounding Test" utilizes a super compact self-propelled crawler machine with a width of only 830 mm, allowing for easy self-propelled entry and setup even in sites with limited access routes and working space. Equipped with a fully automatic striking mechanism using a 63.5 kg hammer, it can penetrate hard layers with an N value exceeding 30, which cannot be reached by SWS tests, allowing for excavation up to around 30 meters deep. By measuring the number of strikes and simultaneously measuring the rotational torque to accurately correct for the effects of surface friction, it calculates highly precise ground strength data with correlation equivalent to that of boring tests. The use of dry construction without water and the reduction of the need for large scaffolding assembly minimizes the effort for temporary setup and removal, enabling verification of the bearing layer with overwhelming short construction periods and low costs compared to boring investigations. This effectively mitigates delays in the construction process and budget overruns for steel frame buildings in small urban sites.
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basic information
The testing system consists of a fully automatic self-propelled automatic ram sounding survey machine (YBM model CRS-12). Its dimensions are 830 mm in width (1,000 mm during operation), 2,350 mm in length, and 2,570 mm in height, with a body weight of approximately 1,630 kg, making it compact and easily transportable on a 2-ton truck. A hammer weighing 63.5 kg is dropped freely from a height of 500 mm (22 times per minute) to conduct dynamic cone penetration tests. The number of impacts (Ndm) and the rotational torque (Mv) are automatically recorded for every 200 mm of penetration, and the corrected N value is derived through torque correction. It is capable of measuring to a maximum depth of about 30 m.
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Applications/Examples of results
It is ideal for new foundation investigations of steel frame buildings, commercial stores, and apartment complexes in urban areas with limited space or high density where large boring machinery cannot access. It is utilized when there is a need to accurately set the specifications and lengths of foundation piles based on reliable ground data while controlling high boring investigation costs and long temporary periods. Additionally, it is widely used for efficiently understanding subsurface strata through point measurements at multiple locations and for quickly securing data equivalent to boring for building reviews and submissions to third-party organizations.
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