English：

In the process of urban renewal, the backfilling of heating pipelines in narrow urban areasfaces challenges such as limited space, environmental sensitivity, and complex geological conditions. Inresponse to the above challenges, lightweight timber pile reinforcement technology has constructed anefficient solution suitable for narrow spaces through innovative pile placement methods, collaborativeconstruction processes, and the application of environmentally friendly materials. This technology adoptsminiaturized equipment and forms a “ pile soil pipe” collaborative force system through reasonable pilelayout,which effectively reduces the impact of construction on the surrounding environment whileimproving soil stability. Compared with traditional craftsmanship, its significant advantage lies in its highadaptability to narrow spaces,which can achieve efficient connection of backfilling, reinforcement,compaction and other processes in limited work areas, greatly shortening the construction period.Adopting environmentally friendly lightweight timber piles to reduce noise pollution and chemicalresidues,which can meet the requirements of green construction. By using a phased constructionprocess, the overall bearing capacity of the soil is enhanced, and the risks of pipeline displacement andsurface settlement are reduced.