How Do You Calculate Backfill And Excavation?

What is excavation and backfilling?

Backfilling is the process of putting the soil back into a trench or foundation once excavation, and the related work has been completed.

The backfill process requires skills and heavy equipment as well as knowledge of the specifications, contract requirements, and soil conditions..

What is the rate of earthwork excavation?

Rate Analysis of Excavation:ItemsUnitsRateHydraulic ExcavatorDay5000Tractor/DumperDay1500Unskilled LaborDay311.2Total4 more rows

What is the process of excavation?

Excavation is the process of moving earth, rock or other materials with tools, equipment or explosives. It includes earthwork, trenching, wall shafts, tunneling and underground. … Some of the different processes used in excavation include trenching, digging, dredging and site development.

What are the three methods of excavation?

Excavation by MaterialTopsoil Excavation. As the name suggests, this type of excavation involves the removal of the exposed or the topmost area of the earth’s surface. … Rock Excavation. … Muck Excavation. … Earth Excavation. … Cut and Fill Excavation. … Trench Excavation. … Basement Excavation. … Dredging.

How much excavation can be done in a day?

It depends upon the soil type and machine category. For ordinary gravelly soils with JCB ( around 40HP) will excavate around 30-40 Cum per Hour and in sandy soils it is about 35-45 CUm . In case of Escors Ex 60 it may increase about 20% and more workability.

How do you calculate earthwork?

Area of Cutting and Filling is found out for each Section with Trapezoidal Method or Nett Area Calculation Method. Then volume is determined by multiplying Average Area with Distance between Sections.

How do you calculate excavation?

So, the formula is: Ab = Wb * Lb, where Wb and Lb are the width and length of the bottom of the excavation. At = Wt * Lt, where Wt and Lt are the width and length of the top of the excavation.

How do you calculate backfill?

How to Calculate BackfillCalculate the volume of the space to be filled. … Calculate the cubic yardage of the same trench. … Next you might need to fill a round hole that is 10 feet in diameter and 5 feet deep. … Estimate the number of truckloads that will be required to fill these two holes with backfill.More items…

What is the average cost of excavation?

What Are the Excavation Costs per Hour in Australia?Excavation costs in AustraliaAustralian State / TerritoryAverage excavation costs per hourSouth Australia$80/hrWestern Australia$88/hrNew South Wales$90/hr3 more rows•Jun 7, 2019

Can you backfill with sand?

Sand, when used in a gravel mixture, can also work for backfill projects.

How do you calculate footing excavation?

Volume of excavation=4.60 Mtr.=0.30 Mtr. + 3.00 Mtr. … =3.60 Mtr.Total Volume of excavation. = 4.60 Mtr x 3.60 Mtr. … = 49.68 CUM.Volume of backfilling. = Volume of excavation – Volume of concrete.Backfilling is done after the construction of PCC, footings, columns. … Volume of pcc.More items…•

What is the best backfill material?

When it comes to backfill, the best material is a combination of gravel and native soil.

How much does it cost to backfill a trench?

Backfill a Trench national average cost The national average cost to backfill a trench is $46.65 per linear foot, with a range between $16.32 to $76.97. The total price for labor and materials per linear foot is $4.57, coming in between $1.60 to $7.54.

How do you calculate topsoil excavation?

To calculate how much topsoil you need, simply measure the dimensions of the area you wish to cover and multiply this by the depth required. Measuring in metres is simplest, as this will give you the volume of topsoil you need in cubic metres. For example: A site has an area of 10m x 15m and needs a coverage of 150mm.

How do you backfill a trench?

No matter the backfill material being used, the correct way to backfill a trench is by doing it in lifts of material, typically between 4-12” thick, and watering/compacting each lift prior to placement of the next.

Why is backfilling done?

Backfilling is an important part of the construction process. Backfilling happens after excavation, when the soil is compacted back into the trench or foundation. It is used to help protect foundations, roadways, walkways and other structures by using a mixture of soil, rocks, and stones.

What are backfill materials?

Backfill refers to the material used to refill an excavated hole, and it is typically used to strengthen and support a structure’s foundation while also promoting better water drainage. Stone is a great choice for backfill because it’s durable and offers great drainage; however, some stones work better than others.

How do you calculate backfill gravel?

Multiply the length of the wall by the desired height, then divide this number by 81 to determine the amount of backfill gravel needed. Add the backfill amount to the base amount to determine the total cubic yards of gravel necessary for completing the wall.