In municipal engineering and various types of underground pipeline construction, the application of double-wall corrugated pipes is becoming more and more extensive. And standardized cushion construction is the key to ensure the long-term stable operation of double-wall corrugated pipes. So, what are the key points of double-wall corrugated pipe cushion practice? Why must double-wall corrugated pipes be cushioned? Next, combined with the specification requirements and professional experience of AD pipelines, we will analyze in detail for you.

According to the "Water Supply and Drainage Pipeline Engineering Construction and Acceptance Code" (GB50268) and the relevant double-wall corrugated pipe cushion practice specification atlas requirements, double-wall corrugated pipes must be made of gravel cushion. This is because the cushion can effectively disperse the load borne by the pipeline and prevent the pipeline from deformation and rupture due to foundation settlement and uneven force, thereby prolonging the service life of the pipeline.

for the general soil area, the base can be laid with a layer of medium coarse sand with a thickness of 100 mm. The medium coarse sand has good water permeability and compactness, can evenly transfer the load, and provides a stable foundation support for the double-wall corrugated pipe. When encountering soft soil foundation and the bottom of the trough is below the groundwater level, sand grains with a thickness of not less than 200 mm should be laid. A thicker cushion can enhance the bearing capacity of the foundation, avoid the pipeline from falling into the soft soil, and ensure the construction quality and later use safety. Whether it is PE double-wall corrugated pipe, AD PVC double-wall corrugated pipe, AD HDPE double-wall corrugated pipe, it is necessary to strictly follow this standard for cushion construction.

in the material selection, what kind of sand is used for the double-wall corrugated pipe cushion, coarse sand or fine sand? The answer is to choose medium coarse sand first. The medium coarse sand particles are large, the grading is good, and a stable skeleton structure can be formed during the compaction process. Compared with fine sand, its shear strength is higher, and the drainage performance is also better. It is the best choice for the double-wall corrugated pipe to use sand as the cushion. As a professional AD pipeline manufacturer, in the practice of many projects, we always insist on using high-quality medium coarse sand as the cushion material, and cooperate with the standard construction technology to effectively improve the quality of the project.

The laying thickness and material selection of the double-wall corrugated pipe cushion are directly related to the success or failure of the pipeline project. In strict accordance with the requirements of the specification, select the appropriate medium coarse sand and control the thickness of the cushion, in order to give full play to the performance advantages of the double-wall corrugated pipe and create a high-quality and long-life underground pipeline project.