High-pressure water jet cleaning and desilting technology is a widely applied pipeline desilting solution nowadays. It primarily uses high-pressure water jet cleaning trucks: the trucks flush clogged sludge in pipelines into manholes of sewage pipes (wastewater pipes) or stormwater pipes, and then specialized desilting trucks or pumps remove the sludge.
High-pressure water jet cleaning trucks are equipped with large water tanks, motorized hose reels, high-pressure water pumps, water jet nozzles, etc. During operation, the truck’s engine drives the high-pressure pump to pressurize water, which is then delivered to the jet nozzle. The high-pressure water passes through small holes in the nozzle, converting pressure energy into kinetic energy to form a high-speed, impactful water jet. Relying on the reaction force generated by the high-pressure jet, the pipeline cleaning nozzle and high-pressure hose move in the opposite direction while cleaning the pipe walls. The high-pressure water stream sprays residual dirt and sediments from the inner walls into downstream manholes, which are then sucked away by sludge suction trucks.
This technology offers advantages such as safety, high work efficiency, environmental friendliness (pollution-free), wide application range, and energy conservation. Consequently, it has been extensively adopted in recent years. It is suitable for various sewage pipes, stormwater pipes, and industrial pipes with diameters ranging from DN80 to DN1500.
Winch desilting technology, also known as mechanical desilting technology, is a commonly used method. It involves passing a TT scraper through the pipeline section requiring desilting, with steel wire ropes attached to both ends of the scraper. One winch is installed at each manhole at both ends of the desilting section, and the other ends of the two steel wire ropes are connected to the winches. The winches pull the steel wire ropes back and forth, driving the TT scraper to scrape sludge into the downstream manhole, thereby unblocking the pipeline.
The winch can be manually operated or motor-driven, depending on actual conditions. This technology is suitable for sewage pipes of all diameters, especially when pipelines are severely clogged with compacted sludge that hydraulic cleaning cannot effectively remove. However, it has a drawback: feeding the TT scraper from one manhole to another requires workers to enter the manhole. Harsh working conditions underground can cause significant inconvenience to workers and even lead to accidents, so safety must be prioritized. A wide variety of desilting tools are available for selection based on specific scenarios. Despite being a traditional method with a long history, it remains widely used today.
Drill pipe crushing desilting technology is an independently developed and innovative technology by the R&D department of Hongyuan Yitong Company, modified from existing tools. It is applicable when cement concrete slurry flows into pipelines due to improper construction, solidifies, and cannot be cleared by high-pressure water jet technology. Our company has successfully completed the stormwater pipe desilting project of the Airport Expressway using this technology, earning praise from the client.
Water flushing desilting typically uses water-blocking devices (e.g., airbags) to block sewage in the pipeline upstream of the device. Once the water level reaches a certain height, the water is released, forming a water flow to remove sediments in the pipeline. After the sediments are flushed away, the device is moved downstream a short distance, and the process of water accumulation and desilting is repeated. This technology has low efficiency and thus limited application.