Basic Procedures of Backfilling in Foundation

December 7, 2020

One process that is often conducted in construction works is backfilling. Backfilling is the process of putting the soil that is extracted during excavation back to the trench or foundation. The soil used for backfilling can also be extracted from other groundworks that are intended to support a structure. 

Contractors that will conduct such work would need professionals who can safely work on the backfilling process. These professionals must then have adequate knowledge of the specifications, backfilling methods and techniques, soil conditions, and contract requirements. They would also need appropriate equipment and tools so that the backfilling process can truly serve its intended purposes. 

Main Purposes of Backfilling

Backfilling serves numerous purposes to the construction and excavation works. For one, it can conveniently provide enhancement over the strength of the foundation. The presence of a strong foundation can hold the weight of the structures that will be built on top of it. With this process, it can swiftly resist all the load that will come from the structures above the foundation.

Another purpose of backfilling is that it can provide great support to the foundation of a structure. Structures such as buildings and other infrastructures require support just to help them stay standing for a very long time. Without great support over their foundation, they might easily collapse and disintegrate due to the presence of deteriorating elements such as moisture, ground movement, and others.

The stability and performance of a structure depend on the presence of backfilling. The process of backfilling can hugely contribute to the longevity of both the foundation and the structures above it. With high-quality backfilling, contractors and property managers can expect their structures to withstand all elements around them. They can also ensure that these structures will stay intact for a long time.

Backfilling Basic Procedures

Before anything else, the contractor should first cure the foundation for at least five days to one week before the actual backfilling process. The curing of foundation prevents any instances of obtaining cracks and ruptures. Afterwards, the part of the ground where backfilling is to be carried out will be cleaned entirely. Any water presence on the said part will be extracted and pumped out.

Once the ground is clear of any debris and water, the selection of suitable backfill material will now take place. Some types of backfill materials that can be selected for the process include coarse-grained soil, finely graded soil, commercial by-products, and controlled low strength material. The process of selecting the material will ultimately depend on the site condition and engineering properties.

Upon choosing the suitable backfill materials, the process of backfilling can now commence. Through the help of excavators, the process will mostly start from the corners and subsequently spread evenly. The fill used for the backfilling will be compacted through a compaction roller or any other suitable equipment, all before adding more layers with a thickness of 15cm to 20cm each. Each layer of fill will be watered and compacted through appropriate tools such as wooden logs rammers or steel rammers.

If you want to know more about backfilling, you can give us a call at Metro Pits.

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