Scope of Works: Reaction Load Test to 600 Tons of existing bored pile in 2nd floor basement
Installation of ground anchors for load test in basement using modified drilling rig
Reaction Load Test under low headroom of 2.7m
Dayabumi Complex was undergoing building upgrades and the property owners wanted to add more structures to the building.
Underpinning work was required for the additional structures. Shinei was invited to conduct a Load Test to the original bored piles that were constructed in the early 1980s.
Key challenges of this project were as following:
Mobilisation of equipment to the second basement level
Assembling of reaction test pile under 2.7m headroom
Dayabumi Complex is located next to the Klang River which is at a higher elevation, strong water pressure due to the high water table had to be addressed and introduced added complications.
Extraction fans for fresh air supply were installed to ensure safe working condition under the confined basement area.
Heavy test beams of 6 meters had to be carefully mobilised into positions in the basement.
Sand bag bunds were placed to control excessive underground water and drilling affluent, which were directed to a desilting pit.
Once basement slabs were opened, high pressured underground water gushed out. As the drilling proceeded for the ground anchor installations, fines (clay and silt) were washed out by the strong underground water, but gravel accumulated in the borehole. With water continuously gushing out, the larger gravels were not being washed out. This accumulation of large gravel prevented further boring. Jet grouting was used to solidify the ground for the installation of ground anchors to proceed.
The 600 ton load test was conducted to a satisfactory level. This resulted in substantial cost saving as installation of new piles and further underpinning were not necessary.
Soil Investigation under low headroom
Extraction Fan for Fresh Air Supply for Underpinning Works
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Ir Tan Chin Shu is a Geotechnical Engineer with over 40 years’ experience in the foundation and geotechnical engineering industry. He is the founding Director of Shinei Geotechnique, a specialist contractor in Malaysia.