Engineering quantity refers to the sum of the various workloads required to complete a project, including the workload of various labor, materials, machinery, etc. The calculation of engineering quantity is an important link in engineering construction, which is of great significance for the control of project cost and the mastery of progress. Therefore, correctly and accurately calculating engineering quantities is one of the necessary skills for every engineer.
First, the principle of quantity calculation.
1.Calculation principle according to drawings: the calculation of engineering quantities must be carried out in accordance with the drawings, including the annotations, descriptions and detailed dimensions in the drawings. The calculation should be carried out in strict accordance with the materials, specifications and dimensions specified in the drawings to ensure accuracy.
2.Principle of bill of quantities: the calculation of engineering quantities should be carried out in accordance with the bill of quantities, and all the items listed in the list must be calculated without missing items. At the same time, items that are not listed in the list can be added by yourself according to the actual situation.
3.The principle of seeking truth from facts: the calculation of engineering quantity should be realistic, and the calculation should be carried out in strict accordance with the actual situation, and no false report, omission or misreport shall be allowed.
4.The principle of overall planning: the calculation of engineering quantity should be taken into account as a whole, and the calculation of engineering quantity should be combined with the application of quotas, so as to better control the cost and schedule.
Second, the steps of engineering quantity calculation.
1.Familiar with the drawings: Before the quantity calculation, you must carefully read the drawings to understand the structure, materials and dimensions of the project. At the same time, it is also necessary to understand the annotations, descriptions, and detailed dimensions in the drawings.
2.Make a list of engineering projects: According to the drawings and actual needs, make a list of engineering projects that need to be calculated. Each project should have a clear name, unit, and calculation method.
3.Determine the calculation rules and methods: According to the bill of quantities and the actual situation, determine the calculation rules and methods for each project. For example, for the calculation of wall quantities, you can use the method of "length, width and height" or the method of "axis size wall thickness".
4.Calculation according to the calculation rules and methods: According to the project list and calculation rules and methods, each project is calculated one by one. In the process of calculation, it is necessary to pay attention to check the data in the attached tables such as material table and equipment table to ensure the accuracy of the calculation.
5.Check and sort: After the calculation is completed, the engineering quantity should be checked and sorted out to ensure the accuracy and completeness of the calculation. At the same time, it is necessary to classify, summarize and arrange the engineering quantities for better follow-up quota application and cost estimation.
3. Precautions for engineering quantity calculation.
1.Pay attention to whether the dimensions and quantities marked in the drawings are consistent with the actual situation. If the annotations in the drawings are inconsistent with the actual situation, it is necessary to communicate with the design unit in time to solve the problem.
2.Pay attention to whether the parts of the drawing that are not marked need to be calculated. If the part that is not marked in the drawing needs to be calculated, it should be confirmed with the design unit in time and added to the project list.
3.Pay attention to the accuracy and completeness of the calculations. In the process of calculation, it is necessary to carefully check the size, quantity and unit of each item to ensure the accuracy of the calculation. At the same time, each item should be checked and sorted out to ensure the integrity of the calculation.
4.Pay attention to whether the order and method of calculation are correct. In the calculation process, it is necessary to calculate in the order of the project list to avoid omission or double counting. At the same time, it is necessary to choose the appropriate calculation method according to the actual situation.
In short, the calculation of engineering quantity is one of the important links in engineering construction, which is of great significance for the control of project cost and the mastery of progress. Engineers must master the correct engineering quantity calculation methods and skills, and calculate in strict accordance with the drawings and the actual situation to ensure the accuracy and completeness of the calculation. At the same time, it is also necessary to pay attention to whether the order and method of calculation are correct to avoid omission or double counting. Only in this way can we better control the cost and progress of the project and improve the quality and efficiency of the project construction.