Site Investigation | Precise Survey to Determine the Inclination of Support Layers for Riverfront Condominium Development
Ground investigation
Clarifying the slope of the supporting layer essential for the construction of riverside condominiums! Geotech's precise ground investigation prevents excessive pile length through multi-point surveys and data analysis.
In the condominium project being constructed along the river, it is extremely important to take appropriate measures against the risks associated with understanding river flow, the complex deposition of alluvial layers due to historical changes, and the steep inclination of supporting layers underground over short distances. If there are insufficient survey points, misjudgment of the depth of the supporting layers can lead to settlement accidents due to inadequate pile length, or excessive safety factors may result in the design of unnecessarily long piles, significantly inflating construction costs. The precise ground investigation services provided by Geotech efficiently conduct dynamic penetration tests, such as automatic ram sounding tests, at multiple locations in addition to standard penetration tests through boring investigations. By highly correlating the obtained high-density continuous data with the company's extensive surrounding ground database "GEODAS," we accurately identify the inclination of supporting layers and uneven layer composition across the entire site in three dimensions. This allows for pinpoint optimization of the length of each pile, significantly reducing unnecessary pile material costs and construction expenses while maintaining structural safety.
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basic information
In this survey method, the Standard Penetration Test (JIS A 1219) and the Automatic Ram Sounding Test (in accordance with JIS A 1221) are combined and conducted. A hammer weighing 63.5 kg is automatically dropped from a height of 50 cm, and the number of blows (Nd value) for every 20 cm of penetration is continuously measured up to a depth of 30 m. A super compact self-propelled crawler machine with a total width of 830 mm is used, allowing for smooth setup even in narrow access routes and limited spaces. An automatic recording device eliminates human errors, and the acquired data is automatically cross-referenced and analyzed with the nearby boring column diagrams in the in-house database GEODAS.
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Applications/Examples of results
It will be utilized in the construction of condominium developments mainly planned along rivers and in former riverbed areas, as well as in the new construction of mid-rise buildings made of reinforced concrete and steel frame, and urban mixed-use facilities. It will be used for optimal pile length selection at sites where an inclination of the supporting layer underground is anticipated, rationalizing pile foundation layout, and creating design basis for steel pipe piles and precast concrete piles. Additionally, it is introduced primarily to resolve difficulties in transporting large machinery to sites with narrow distances from densely built urban areas and adjacent buildings, to create detailed ground data for submission to building confirmation applications and structural calculation compliance assessments, and to prevent troubles during pile driving due to inconsistencies in embedment depth and reduce construction costs.
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