Issue of long-distance earthwork volume
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I have a question for everyone. When I was on site, I found that the quantities indicated in the design cross-sections often differed from the actual volume of earthwork required for construction. It was only through communication with the colleagues from the design institute that I learned they input parameters such as the width allowance at the bottom of the trench, pipe diameter, and trench slope when carrying out designs; additionally, the design elevation is determined by the designers based on the specific circumstances. Following this approach, the volume of soil for the trench as determined by the design is the amount of soil that needs to be removed to reach the designed elevation and slope of the trench, based on the original terrain. It consists of two parts: 1. The amount of soil to be excavated for the trench, on the basis of a leveled working surface ； 2. The volume of earthwork formed between the original terrain and the plane of the working area, after the trench is laid out according to the designed slope. Therefore, if the construction party compares the total volume of soil work during construction (the volume required for grading the work area plus the volume needed to dig the trenches) with the volume indicated in the design drawings, there will be a significant difference, especially in mountainous areas, where the amount of soil work required for grading the area is often much greater than that needed simply for digging the trenches. As far as I know, most design institutes in the country provide the earthwork quantities for cross-sections using the aforementioned method. I think this is a common issue; I wonder how the brothers in this forum handle similar engineering problems. It is said that the West-to-East Gas Pipeline project was resolved by the supervisor through earthwork visas; I’ve only heard about it, so I’d like to verify this as well.
As designers, it is impossible to calculate the volume of earthwork with complete accuracy; the contractors always claim that the design office has calculated too little, while the owners do not think so, which makes it very difficult for the design office. It’s difficult to reach an agreement among the three parties.
The calculation of earthwork is already quite complicated; the problem now is that the amount of earthwork in the grading area is not taken into sufficient consideration in the cross-sectional diagrams. I wonder how the volume of soil in the work area is handled in the projects that the brothers are involved with. Is it a supervision visa, a design change issued by the design institute, a change notification from the construction unit, or some other method?
It seems no one is helping, 555555555555555
The vast majority adopt the form of on-site supervision visas. Construction liaison sheets rarely address the volume of earthwork. The design generally does not change the amount of earthwork.