HESUPIPE
The concepts of “burial depth” and “soil covering depth” are confusing. The focus of this article by Henan Hesu Industrial Co., Ltd. is to make this issue clear. The burial depth is the distance from the bottom of the pipe to the ground surface, and the soil covering depth is the distance from the top of the pipe to the ground surface. Let’s talk about it in detail below
1. What are “burial depth” and “soil covering depth”?
“Burial depth” refers to the vertical distance from the bottom of the pipe to the ground surface, which reflects the overall depth of the pipe below the ground. It is mainly used in design and construction to ensure that the pipeline is laid at an appropriate depth to avoid being affected by external environmental factors (such as frozen soil and groundwater).
“Soil covering depth” refers to the thickness of the soil layer from the top of the pipe to the ground surface. It only considers the thickness of the soil layer covering the top of the pipe, but not the height of the pipe itself. The soil covering depth determines the ability of the pipeline to withstand surface loads (such as traffic and construction).
It is easier to understand by making a picture:
2. What are the factors affecting “burial depth” and “soil covering depth”?
● Soil type
The influence of soil type on burial depth and cover depth is mainly reflected in its bearing capacity and stability. Dense and stable soil can provide better support for pipelines and usually allows shallower burial depth and cover depth, while loose and weak soil requires increased burial depth and cover thickness to enhance the stability of the pipeline and prevent settlement or displacement.
● Groundwater level
When the groundwater level is high, it will cause the soil to loosen or soften, reduce the bearing capacity of the soil, and increase the difficulty of construction. It is usually necessary to increase the pipeline burial depth and cover depth to maintain the stability of the pipeline.
● Climate conditions
In cold areas, the soil is easily affected by freezing and thawing. To prevent the pipeline from freezing and cracking, the burial depth usually needs to be greater than the frozen soil depth to ensure that the pipeline is below the frozen soil layer, and the cover depth also needs to be increased accordingly to provide additional insulation and protection to prevent the direct impact of frozen soil on the pipeline.
● Ground load:
The load of traffic, buildings or heavy equipment on the ground will put pressure on the pipeline. Excessive load will increase the pressure on the underground structure, requiring a greater burial depth to disperse the stress and avoid structural deformation or damage. In addition, the cover depth needs to be thick enough to bear the ground load and prevent the upper soil layer from compressing, settling or shifting sideways to ensure the stability and safety of the underground structure.
● Pipeline type:
Different types of pipelines (such as water supply, drainage, and gas) have different requirements for safety and stability, and the requirements for burial depth and cover depth are also different. For example, gas pipelines usually require a greater burial depth to prevent leakage and improve safety, while larger diameter or high-pressure pipelines also require increased cover depth to provide additional protection and support.
● Standards and specifications:
The burial depth and cover depth of all pipelines must be carried out in accordance with relevant specifications and standards, such as GB50015-2009 “Design Code for Building Water Supply and Drainage”, GB50028-2006 “Design Code for Urban Gas”, GB 50264-2013 “Construction and Acceptance Specifications for Thermal Pipeline Engineering”, etc., have relevant requirements for burial depth and covering depth.
3. The relationship between “burial depth” and “covering depth”
Although both burial depth and covering depth describe the distance between the pipeline and the ground, they have different focuses. Burial depth considers the overall safety and stability of the pipeline more, especially when dealing with ground loads, groundwater levels and soil conditions; while covering depth focuses more on protecting the pipeline to prevent external factors such as traffic loads or frozen soil from causing direct damage to the pipeline.
In actual projects, burial depth and covering depth often need to be considered comprehensively to ensure the long-term safe operation of the pipeline. For example, in cold areas, antifreeze requirements may increase the requirements for burial depth and covering depth at the same time; in areas with heavy traffic, the covering depth may need to be increased to resist the impact of ground loads.
Having said so much, the fundamental purpose is to help you figure out which part “burial depth” and “covering depth” refer to, which is from the bottom of the pipe to the ground surface, and which is from the top of the pipe to the ground surface. It is enough to figure these out.