Site Investigation | Preventing Settlement of Small Steel Buildings with Neighboring Data and On-Site Surveys
By integrating neighboring ground data comparison and on-site dynamic cone penetrometer testing in the construction of a steel building on a small plot, we achieve structural safety that prevents differential settlement.
In the construction of steel frame buildings in urban areas and densely populated regions, there is a risk of serious differential settlement accidents if inclined support layers or uneven soft soil layers cannot be accurately assessed. The advanced ground diagnosis solution provided by Geotech analyzes standard penetration test data registered in a wide-area database to identify the distribution of local strata and trends in inclination direction in advance. Subsequently, a compact self-propelled automatic ram sounding test machine is deployed in the limited space of the site to conduct high-precision continuous penetration impact (Nd value) measurements. By highly correlating and verifying neighboring data and site values, we accurately identify and analyze the drop in support layers and localized variations in three dimensions. Through reliable N value conversion and allowable bearing capacity evaluation, we achieve the selection of pile length and diameter that is safe and efficient. The ground analysis report that meets building code requirements and academic guidelines facilitates the confirmation application and structural compatibility assessment, ensuring the structural safety of the building is robustly maintained over time and providing peace of mind for the client.
basic information
This is a system for the correlation analysis of dynamic sounding data obtained from an automated automatic ram sounding survey machine and the GEODAS ground data database. A hammer weighing 63.5 kg is dropped from a height of 500 mm, and the number of blows (Nd value) for a 200 mm penetration of a 90-degree cone tip is continuously measured. It supports continuous measurement up to a penetration depth of 30 m and calculates high-precision corrected Nd values through a surface friction correction function. The obtained measurement values are accurately converted based on the correlation formula with the N values from standard penetration tests, ensuring reliable calculation of ultimate bearing capacity and long-term/short-term allowable vertical bearing capacity.
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Boring survey
Applications/Examples of results
It is used for ground evaluation and structural examination response services during the confirmation application for urban steel frame buildings and mid- to high-rise reinforced concrete structures. It is particularly effective as a precision-focused ground diagnosis to prevent differential settlement in high-risk narrow sites, such as the edge of plateaus where inclined supporting ground is expected, developed land, and along old riverbeds. Additionally, it is ideal for high-precision foundation pile design by structural design offices, preparation of ground basis documents to be submitted to designated confirmation inspection agencies and designated structural calculation conformity assessment agencies, and for technical explanatory materials on structural safety for clients and project owners.
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