Site Investigation | Optimizing Pile Length for Steel Frame Buildings on Narrow Sites through Data and Field Exploration of Demolition Sites
Boring survey
In the construction of a steel building on a small site, we will conduct on-site surveys using small machinery and cross-reference with nearby data to determine the optimal pile length that prevents troubles during pile driving.
In the construction of steel frame buildings in densely populated urban areas or on narrow sites of demolition, concerns about existing obstacles and the limitations of transporting large machinery pose significant challenges for accurately understanding ground bearing capacity and ensuring reliable pile foundation construction planning. The construction-responsive solution proposed by Geotech employs a highly mobile self-propelled small automatic ram-sounding testing machine to approach the site, allowing for precise deep ground impact (Nd value) measurements in a compact space. Furthermore, by comparing and correlating real-time data from its own ground database with nearby boring column diagrams and on-site measurement data, it clearly determines the inclination of bearing layers and changes in strata beneath existing structures, which are difficult to identify with single-point investigations. Through advanced matching with on-site data, it preemptively avoids construction issues such as insufficient pile length or excessive overburden during pile driving, ensuring the selection of optimal steel pipe piles and confirming appropriate lengths in accordance with the construction plan. This comprehensive support enhances the safety of construction sites and eliminates fluctuations in construction schedules and costs, providing highly reliable foundation construction management.
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basic information
A small penetration device equipped with crawler self-propelling legs (weight 1,630 kg, total width 0.83 m, total height 2.57 m) will be used. It can approach in densely populated urban areas with a transport route width of 1.5 m or more and a working space height of 3.0 m or more. A hammer weighing 63.5 kg will be dropped 500 mm onto a rod fitted with a cone with a tip angle of 90 degrees and an outer diameter of 45 mm, and the number of penetration strikes (Nd value) and torque for rod surface friction correction will be automatically measured and recorded up to a maximum depth of 30 m. The obtained Nd value will be immediately correlated and converted into the standard penetration test N value (N value of 50 or more) within the system.
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Applications/Examples of results
This applies to the construction sites of low to mid-rise steel buildings, rental apartments, and mixed-use residential buildings being newly built or renovated in bustling streets and densely populated urban areas. It is ideal for pile foundation construction plans at sites along narrow roads where large heavy machinery is difficult to bring in, as well as at locations where the demolition of existing buildings or underground obstacles is a concern. It is utilized for setting management values for pile driving at construction sites, final confirmation of the depth of the bearing layer, and reducing the labor involved in cutting excess piles, aiming to standardize construction quality and improve cost and schedule management by construction agents and site supervisors.
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