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ALL YOU NEED TO KNOW ABOUT THE UNDERPINNING TECHNIQUE Presented by:Restumping Underpinning Expertsrestumpingunderpinningexperts.com.au
THE PIT METHODThis method is also known as the mass concrete method. In this method, work is done in sections. The columns used in the pit method are shorter compared to the ones used in other techniques. Step1 The length of the foundation that is to be underpinned is divided into regular sections with the measurements of 1.3m:1.5m. Each section is taken up one after the other. Step 2 A hole is drilled into the foundation wall of the divided sections just above the plinth level. Step 3 A needle, either made of steel, timber or stout is then inserted into the hole. To hold up the foundation and the mansory on top, the needle is attached to a bearing sheet. For the support system to be effective, the needle’s arrangement is made of wooden blocks on each side of the wall and fastened jacks. Step 4 Here, the foundation trench is excavated according to the required level and the fresh foundation is laid underneath the pit. At this point, the first section is done. The second section is later on taken up. Some precautions should be taken into consideration. For example, floors should be supported and weak walls provided with raking shores.
THE PILE METHODHere, the foundation pile also known as the piers are, by proper driving procedure, installed along each side of the wall to be strengthened at an equal length. This is normally done to transfer the weight of the building away from the unstable concrete. Thereafter, needles made of concrete or steel are driven into the walls where they connect to the piers. The needles here have a crucial role to play. They act as beams and caps at the same time. • ADVANTAGES OF PILE METHOD • The pile method is suitable in areas with; • Erosive, waterlogged and clayey surfaces • Expansive and weak bearing layers
CONCLUSION There are some signs to look for once in doubt of whether you need underpinning or not. Below are some: Go for underpinning if; • You notice some cracks on the floors and walls • Your floor is not levelled • The doors and windows are not aligned However, it is always wise to seek help from the experts in underpinning near you.