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How to Calculate Cut and Fill for a Building Site
Before you can build an office, house, shop, garage or other structure, the site must be graded.
Estimating how much cutting and filling will be required to level the building is one of the most important techniques in estimating. Calculating building materials, the area to be painted, the number of doors and windows, etc. is child’s play compared to estimating cut and fill quantity Down to the house. The reason for this is that negative space almost always has a negative effect. The amount of soil that needs to be removed from the site without development or management can be difficult to determine because of this.
There are three main ways to calculate and write for the school. The first two are “by hand” and require a building plan, a plumber, a pencil, a calculator and a timer. The third method requires excavation software, a computer and a few computer skills.
The first “by hand” method is to use the grid to calculate and fill the buildings. In this way, the space is divided into equal grid squares. Grid squares are usually 1 inch to 2 inches in size on the planning paper. For each corner of each plan both the existing elevation and the proposed or final elevation are calculated and recorded on the plan. When all elevations are determined, the difference between the existing elevation and the proposed elevation at each corner is written on the plan as well. Then for each square, the elevation difference for each of the four corners is added together and averaged by dividing the number by 4. If the average elevation difference to a square grid is negative, then this is the cutting area. In the cutting area, the existing height must be reduced to the requested height or “cut”. If the average height difference is positive, that means that the existing height should be increased to the requested height or “fill”. Then all the negative numbers are added together and totaled to determine the total cut depth. Then the positive numbers are added together and the total depth is calculated. Then each total cut and total fill is divided by the square footage to determine the number of cubic feet of cut and cubic feet of fill. And finally the cut or fill volume is divided by 27 to determine the total area of cubic yards of cut and cubic yards of fill (excavators work in cubic yards instead of cubic feet). Finally, the difference between the total cut volume and the total volume volume is calculated. If there is more cutting than filling, the soil should be removed from the building and transported. If there is more than the cut, the soil should be put into the house. The time needed to calculate cut and fill with the grid method is about eight hours for a map of a little difficulty. Accuracy with this method is +/-20%.
The second method used to calculate cut and fill is called cross section method. In this way, the brother draws a set of evenly spaced horizontal lines in the site prepared separated by 1 to 2 inches. Then for each cross line the estimator outputs, on the map, both the existing surface and the proposed surface vs. the distance between the segments. It then calculates the number of squares where the existing space is above the specified value. This is the cut point for that cross section. Then it calculates the number of squares where the existing space is below the requested space. This is the fill area for the cross section. He repeats these steps until all sections of the plot are completed. Then it averages the cut between each pair of segments and divides it by the distance between the segments and divides that number by 27. This is the cut volume of the lines that are one side. It then repeats these steps for the fill area to determine the volume of all adjacent rows. Then he collects all the cuts and all the packaging in order to determine all the cuts and fills for the building. If there is more cutting than filling, the soil should be removed from the house. If there is more than the cut, the soil should be brought into the house. The time required to calculate cut and fill with the cross-sectional method is approximately 20 to 30% longer than the grid method. The accuracy with this method is about +/-15%.
The third and final way to calculate cut and fill for the building is to use excavation software. In this way, the data is a trace of the plan using a large format digitizer, trace on the screen using a PDF of the building plan or coming directly from the AutoCAD file. The computer then analyzes the drawings to create both the existing and the intended space. Then for hundreds of thousands of points throughout the site, the software calculates the difference between the existing elevation and the proposed elevation to determine the total cut or fill volume for the building. education. The time required to calculate and record using excavation software is about one-third of the time required for the road grid. The accuracy with this method is about +/-5%.
The advantage of both the grid and the cross section to calculate cut and write is that both use cheap and common materials. The downside is that they both require a lot of work time and have average accuracy.
The advantage of using excavation software to calculate cut and fill is faster estimation and more accuracy. The downside is that the cost can run from thousands of dollars to tens of thousands of dollars for software and hardware and requires the estimator to have some computer skills.
The right way for your company to calculate cut and write for your competition is based on the number of excavations you need to do each year. If you only do a few removals a year and you or your estimator is not dangerous, then the “by hand” method is enough. If you are an excavator or general contractor who does a lot of cutting and filling estimates, then purchasing the right tools and equipment will increase your ability and accuracy in competition for jobs to be excavated.
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