Documentary of “minimally invasive surgery” of Taizhou underground pipeline network: non-excavation technology solves the problem of pipeline landslide

6 meters underground in the main urban area of ​​Taizhou, a severely deformed DN800 sewage pipeline is undergoing "rebirth". Facing this landslide pipeline with a 35% cross-section compression rate, Maoting Environment's technical team adopted a "trial-in-one" non-excavation and restoration plan, creating a new standard for the restoration of local municipal pipeline networks. Maoting Environment: National unified construction☎1527-0088-218

The multi-dimensional precision diagnosis technical team has integrated and used three-dimensional laser scanning and geological radar detection for the first time. The detection robot equipped with a high-precision inertial navigation system draws a point cloud model with millimeter-level accuracy in the deformed pipeline, and simultaneously marks loose areas of the surrounding soil with ground radar. "This combination diagnosis is like performing gastroscopy and CT at the same time. It not only allows you to see the degree of deformation of the pipe, but also find soil defects within 2 meters around it." The project chief engineer explained, pointing to the red and yellow three-dimensional map on the screen. The data shows that there are 3 spiral cracks and local tube top collapse in this section, and structural replacement must be carried out.

The pneumatic fragmentation pipe top technology aims at the collapsed sections that are difficult to cope with in traditional pipe top technology. The #Maoting Environmental Rain and Sewage Pipe Repair# team innovatively adopts the "pneumatic fragmentation + spiral soil discharge" method. The front end shattered head crushes the original concrete pipeline at a frequency of 280 times/min. At the same time, the hollow auger rod discharges the slag in real time, and the rear is simultaneously pushed into the new fiberglass sandwich pipe with an ring stiffness of SN12. "The exquisiteness of this process is to maintain a pressure balance of 0.01MPa and ensure the safety of the main road of Jingtai Road above." The construction team leader introduced. After 72 hours of continuous operation, the 68-meter pipeline replacement was successfully completed, and the surface settlement was always controlled within 3mm.

Local UV curing enhancement For the transition section connecting branch pipes, technicians have adopted double-layer ultraviolet curing repair technology. First, the underlying resin containing nano-silicon dioxide is injected to fill the cracks, and then a reinforcement layer mixed with carbon fiber is laid. After curing with intelligent temperature-controlled UV lamps, a composite structure with a compressive strength of 0.4MPa is formed. A specially designed tapered transition joint increases the overcurrent capacity at the connections of new and old pipe sections by 40%.

After the construction and repair of the intelligent monitoring system was completed, the engineering team deployed a distributed fiber monitoring system at key nodes. The project manager demonstrated the dynamic monitoring platform: "These 128 sensing units can capture pipeline strain and surrounding soil displacement in real time, and the warning accuracy reaches 0.01% deformation." The system can also automatically generate a structural health curve. When the value is below the safety threshold, a hierarchical disposal plan will be pushed to the mobile terminal of the municipal management personnel.

The lights are on, and the last batch of equipment is evacuating the construction site. This underground "minimal invasive surgery" that lasted 120 hours not only avoided the excavation of 4,000 square meters of roads, but also interpreted the scientific and technological connotation of modern municipal operation and maintenance with its 1.2 mm axis deviation accuracy. With the monitoring of green data flows that are jumping on the screen, Taizhou underground pipeline network has officially entered a new era of digital operation and maintenance.