Beware on what underneath the ground!

We never know what is underneath us, there are always uncertainties exist below ground. These uncertainties may be significant to the design of foundation and underground structure.

In this shallow foundation project, we had gone through an interesting experience about the contrary of expected and actual condition beneath our site. The challenging part about this project is the existing SMART tunnel is right below the proposed building. Desk studies were carried out to understand more about the location and dimensions of the tunnel based on available information and drawings given to us. The original design of strip foundation was proposed to be sitting on top of rock. To confirm the feasibility of our design, soil investigations and rock probing tests were carried out. The results showed it was desirable in a way it is within our design assumptions.

Everything seemed to be going smoothly until the contractor started excavation to begin the construction of strip footing. The actual site condition contradicted to our expectation, there were many abandoned structures from the previous construction of SMART tunnel such as RC wall, gabion wall, pipes and even concrete column. Worse still, the rock edges alignment located away from our design assumptions, in which part of the proposed strip footing is not supported directly on rock, due to the over-excavation during construction of SMART tunnel. To solve this issue, we had to revise our design as well as proposing ground treatment work to suit the actual site condition.

From this experience, we can learn that uncertainties always exist below the ground since we have no clear vision on it, even though quite number of investigation works were carried out. Hence, we are encouraged to have more careful considerations on the uncertainties below ground in foundation and underground structures designs and always be prepared for design changes to suit the actual site condition during construction.

Author: Si Jet

Strip Foundation System with PT Transfer Beams

We designed alternative foundation system for a building over the existing SMART tunnel in KVMRT Line 2 project. The original design was bored pile with pile cap.

The site is underlying by limestone rock which was disturbed during construction of SMART tunnel. An cost-effective design using strip footing was proposed as an alternative to minimise the construction risk of bored piling work which is very near to the existing tunnel. The footing is generally placed on top of limestone rock. Pre-stressed transfer beams will then be constructed to transfer all the loads from the building above SMART tunnel onto the strip footings.

The construction is currently on-going at site.

High Slope Rehabilitation Work

We have been appointed by a Design & Build Contractor to provide the detailed design for a slope rehabilitation work project in LPT2, Terengganu.

The existing slope comprises of 9 to 13 berms with a maximum height of approximately 80m from the expressway level. Most of the drains are in poor conditions; they are cracked, spalled, broken or covered up by vegetation and siltation. There were numbers of gullies and scoured surface on slope berms and slope surface.

As the slope is large, the rehabilitation work is divided into 4 stages for implementation. For Stage 1 and 2, the loose cut slope surface will excavated away and then backfilled with well-compacted rock. The construction is currently on-going at site.

Innovative Temporary Shoring System

Our 1st innovative soldier pile system design using steel I-beam and sheet pile at one of our Johor project sites in Electrified Double Track project.

Excavation below ground level is required for construction of reinforced soil wall of approach bridge abutment. The total excavation depth is about 6.6m and located beside the existing road.

Cambodia Project: Topping Up

Finally, our building project in Sihanoukville had topping up at 21st floor. This is indeed a magnificent feat to us after 13 months of carrying out the engineering design in concurrent with the construction work at site. We faced uncountable design variations due to ever-changing architectural requirements and construction issues.

Nothing is impossible if we put our thought together in proper planning and effective implementation at all times!

PT Raft Foundation

Our 1st project in Kota Kinabalu, Sabah.

We design and supervise the post-tensioned (PT) piled raft foundation for one level basement building. Excavation depth reduced due to thinner PT piled raft slab compared to conventional pile cap and raft thickness.

Overall saving in time and cost as well as less complicated temporary earth lateral support system required.

If you are looking for value engineering on foundation system, please do contact us today!

Building Foundation Strengthening

This is our 1st overseas project in Cambodia. We have been appointed by the Owner to provide strengthening design for the 28-storey foundation system supported on bored piles.

The existing bored pile foundation work which had been completed by the design & build contractor unable to achieve the required proposed design pile working load during pile testings. About 50% pile cap were also completed at that time.

Here’s a look at the overall site condition when we first arrived at the site. Our journey begins…

Bridge Protection Work: Final Update

Finally, the bridge protection work for the project last posted on 28 March 2018 had been completed. The final product is as shown in this photo.

It was a real challenge for the Contractor during the construction as the river water rises rapidly during heavy rainfall. The excavator needs to move out from the river before the rain comes.

All done now and the bridge will be well protected for many years to come!