Over time, your house or building could be suffering from sinkage. And the best way to fix the problem is by using the underpinning method done by the best underpinning services in Melbourne. In the implementation of ‘underpinning’, in addition to strengthening the existing foundation, security measures are also required for neighbouring buildings due to open excavation which causes changes to geostatistics. This security measure is necessary, especially for buildings whose walls are coincided.
These safeguards can be in the form of:
1. ‘Tie back’ vulnerable building components.
2. Strengthening the wall, opening the open part.
3. Lateral support between two adjacent building walls.
4. Periodic monitoring of the results of deformation measurements in the field.
5. Early warning of possible hazards that will occur.
The reinforcement of the boundary wall foundation may only be carried out if there are no other feasible alternative technical solutions to be implemented and it does not cause damage to neighbouring buildings. It is clear that ‘underpinning’ was initially a technical problem, however, in its implementation it requires synergy from all ‘stakeholders’ to achieve maximum implementation results. Basic soil types with pseudo cohesion need to be watched out for because they are very vulnerable to fluctuations in water content. In the rainy season, the soil consistency is easy to turn into liquid, which results in decreased bearing capacity and slope stability. The process of draining the soil during excavation and the wrong estimation of soil parameters can create a failure-prone situation.
Misleading pseudo-cohesion can result in inadequate safety measures, for example, the excavation slope is too steep. For sand soil, it is necessary to study the groundwater flow mechanism. Classical underpinning in these conditions also requires extra precautions against neighbouring buildings. Underpinning the building foundation with a small vertical load will also produce a smallholding moment so that it is unable to compensate for the rolling moment due to active soil pressure. Generally, ‘underpinning’ work with small vertical loads on sandy soils without a safety structure is limited to a depth of 0.5 m.