The Use of Underpinning Techniques and Procedures in the Strengthening, Repairing, and Stabilizing of Foundations

The underpinning technique is used to strengthen an old foundation, or place a new one below it at a greater depth, more info?

We must choose the right method to repair this sensitive project. To choose the right method, it is important to know and understand the soil strata and the existing situation. We also need to consider the problems affecting the foundation as a whole, including the depth and size of the foundation.

Underpinning can also be used to replace a foundation that is vulnerable.

Underpinning can also be used to replace a foundation that is vulnerable.

Prepare the foundation before installing it:

It is important to inform the adjacent or not of the planned works, with the typical actions about their use.

If you have any doubts, carry out an inspection. The effects of the cracks and their location are noted and reported to adjacent owners.

Before starting, the reasons for the settlement are identified and the solutions.

Meri is used to lower the structural load by removing dead weights from the floor, as well as imposed loads. The underpinning work can then be started only when the props or shoring are required.

If there are any, a section of an area that is made vulnerable due to proposed underpinning work should be protected and supported by identification, tracking and marking, or by exposing.

Underpinning is necessary

1) Uneven settlement can be caused by unsymmetrical loads on the building or the unequal bearing capacities of all soils beneath the foundation.

2). Addition of stories or change of the service load caused the building manager to alter the process for loading.

3). If you are working on the adjacent foundation, it’s important to stop and lower the foundation.

The Methods for Underpinning

The following are the methods that can be used to carry out underpinning:

1)Pit Method

2).Pile methods

Underpinning walls

4).Jack pile underpinning

Needle and pile underpinning

The ‘Pynford Stool’ method for underpinning

Root piles or Angle Pilings Underpinning Columns

Methode de Pit

This method involves dividing the length of the foundation into sections between 1.2 and 1.5 meters. Each section must be completed one at a time.

Then, the needle is placed in the hole. It can be made from a strong material, such as timber or steel. The needle is supported by bearing plates placed on top of it. Supporting the needle are crib supports, which are wooden blocks on either side of the wall. They also use screw jacks.

Then, the foundation pit will be excavated to the level required for a new foundation. In the excavation pit, the new foundation will be laid. It is important to take some precautions during work. For example, raking the walls and floors, as well as providing shores in the week wall.

Consider the following factors when using the pit method.

1). In the first round, alternate sections are tackled. Next, the remaining intermediate sections will be taken. At any given time, only one section is to be completed.

2). When working on a longwall that extends in both directions, it is best to begin the job at the center.

3). The foundation trench can be properly timbered if the new foundation is larger.

4). Only after the foundation is fully solidified should all other arrangements, such as needle beams and so on be removed. The removal of the needle beams etc. should be done slowly.

Pile method

As the name implies, the Pile Method of Underpinning involves installing piles by using the correct driving technique on both sides of the wall that needs to be reinforced. The most common piling method is borehole pile and under-reamed piles.

The needles, either concrete or steel, are then inserted through the wall to connect the pile. The needles are used as both beams as well as caps for the pile.

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