Site Investigation | Optimization of Pile Length and Cost for Small Steel Frame Buildings through Data Comparison and Detailed Surveys
Boring survey
We achieve optimal pile length calculation to prevent excessive design by integrating neighboring ground data comparison and on-site dynamic cone penetration testing in the construction of steel frame buildings on narrow lots.
In the construction of steel frame buildings on small plots in urban areas, detailed boring surveys are often difficult due to constraints on heavy machinery access and the presence of adjacent structures, leading to excessive design on the safe side that pressures costs. The ground investigation solution proposed by Geotech is a groundbreaking method that combines comparative analysis of neighboring boring data utilizing a wide-area ground database (GEODAS) with precise on-site measurements through automatic ram sounding tests using small self-propelled machines. This method allows for the depth and inclination of the bearing layer to be understood in millimeter units within the limited space of the site, calculating reliable strength indicators equivalent to the N value of standard penetration tests. By eliminating uncertainty and identifying the optimal pile length and diameter, it achieves reductions in material and construction costs for steel pipe pile work. Furthermore, the detailed ground report that includes analysis results compliant with building codes strongly supports smooth passage of structural calculation conformity assessments and building confirmation reviews, thereby facilitating a secure business plan.
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basic information
This technical solution consists of a dynamic cone penetration test using an automatic ram sounding test machine and analysis using the GEODAS database. A hammer weighing 63.5 kg is continuously dropped from a height of 500 mm, and the number of impacts (Nd value) for every 200 mm of penetration is measured up to a depth of 30 m. It is equipped with a torque measurement mechanism for surface friction correction and can be approached in narrow spaces of about 1.5 m in width using an automated self-propelled small machine. A correlation conversion formula with the N value of the standard penetration test (equivalent to N value 50) is used to conduct a high-precision evaluation of allowable vertical bearing capacity.
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Applications/Examples of results
This survey service is ideal for new construction sites of low to mid-rise steel-framed buildings, condominiums, and mixed-use residential buildings located in densely populated urban areas and shopping districts. It is particularly effective in narrow sites where the entry of large boring machinery is difficult, as well as in sites where adjacent buildings are close by. It is widely used for selecting steel pipe pile methods in developed land and flagpole sites where there are concerns about the slope of the supporting layer and local depth variations. Additionally, it supports design offices in optimizing pile lengths to prevent cost increases due to excessive design and in obtaining reliable ground evidence for structural calculation compliance assessments.
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