In underground pipe network projects such as municipal drainage and gas transportation, HDPE carat pipes have become the mainstream choice due to their excellent anti-corrosion and anti-settlement properties. However, the traditional construction method of "welding first and then backfilling as a whole" is often faced with problems such as delay in construction period and high risk of pipeline deformation. In recent years, the innovative construction method of "backfilling while welding" has gradually become popular, and HDPE carat pipes of AD pipelines have become an ideal carrier for this construction method due to their product characteristics. So, what are the advantages of this construction method? The first is the "precise compression" of the construction period. In traditional construction, pipelines need to be fully welded and tested through the interface before backfilling. The welding and backfilling links are in a "series" state, and the waiting time is long. The "segmented operation" mode is used for backfilling while welding - every time a section of pipeline is welded (usually 10-20 meters), the section is immediately backfilled and compacted. Taking a city drainage pipe network project as an example, in the construction of a 1-kilometer HDPE carat pipe, the traditional construction method takes 12 days, while the welding and filling method only takes 7 days, and the construction period is directly shortened by about 40%. It is especially suitable for municipal projects that rush the construction period. The second is the "effective control" of settlement risk. Although HDPE carat pipes have high ring stiffness, in the scene of insufficient bearing capacity of soft soil foundation and backfill soil, if the welded pipeline is exposed for a long time, it is easy to sink or deform due to uneven local stress. Backfill while welding solves this pain point by "timely support": backfill soil can quickly form a radial constraint on the pipeline, reducing the free deformation space of the pipeline after welding. According to the data of a soft soil foundation project, the settlement of the pipeline using the welding and filling method is only 35% of that of the traditional method, which greatly reduces the risk of dislocation and leakage of the pipeline network in the later stage. Cost savings are also one of its core advantages. In traditional construction, in order to prevent the pipeline from rolling or sinking, temporary supports (such as sandbags and steel brackets) need to be set up, and this part of the material and labor costs account for about 8% -10% of the total construction cost. Backfill while welding saves the temporary support link and reduces the care cost during the pipeline exposure period. Calculated per kilometer of pipeline, this construction method can save about 1.2-1 5,000 yuan in direct costs. For large-scale pipe network projects, the cumulative savings are considerable. The improvement of safety cannot be ignored either. The longer the pipeline is exposed to the open air environment, the higher the probability of being affected by construction machinery collisions and weather factors (such as rainstorm initialization, high temperature exposure). Backfilling while welding allows the pipeline to "weld a section and bury a section", effectively reducing the risk of external damage. In a gas pipeline project, after using the side-welding and side-filling method, the appearance damage rate of the pipeline was reduced from 5% of the traditional construction method to 0.5%, which greatly improved the stability of construction quality. In addition, this construction method has stronger adaptability to complex terrain. In areas with undulating terrain or complex geological conditions such as hills, wetlands, and urban-rural junctions, backfill while welding can adjust the backfill height and compaction degree according to the segmented terrain to avoid the local stress concentration problem caused by traditional "one-size-fits-all" backfill. For example, in a wetland drainage project, due to uneven foundation bearing capacity, the traditional construction method had three pipeline deformations. After switching to the side-welding and side-filling method, all pipelines met the design requirements. It is worth mentioning that the effect of backfill while welding is highly dependent on the performance of the pipeline itself. The HDPE carat pipe of AD Pipeline adopts imported high-density polyethylene raw materials, and the ring stiffness can reach SN8-SN16 grade, which can withstand the early pressure of backfill soil. Its welding performance is excellent. When using heat shrinkable sleeve or electric fusion welding, the interface strength can reach more than 90% of the base metal, and the interface can be maintained stable even during the backfill process. In addition, the special welding equipment and technical guidance provided by AD Pipeline further ensure the construction quality of the side-welding side-filling method. From the industry trend, the underground pipe network project is developing in the direction of "high efficiency, high quality and low cost", and the side-welding side-backfilling method just fits this demand. The HDPE carat pipe of AD Pipeline provides a more competitive solution for the construction party through the perfect matching of product performance and construction method. Whether it is a municipal project with a rush schedule or a remote project with complex geology, this construction method can play its unique advantages and become the "synergistic code" for the construction of HDPE carat pipes.