Recently, a full-scale test of large-diameter inorganic high-performance fiber composite material (UHPC) cable jacking pipes was successfully conducted by a joint research team from China Electric Power Research Institute Co., Ltd. and State Grid Hubei Electric Power Co., Ltd. The test verified the high strength and high crack resistance of UHPC cable jacking pipes, laying a solid foundation for the subsequent engineering application of this type of jacking pipes.

Cable jacking tunnels are an important form of main network power supply channels in the core areas of cities, and the pipe segments are usually prefabricated with ordinary concrete. UHPC is made by adding nano-silica, nano-calcium, and steel fibers to ordinary concrete. The jacking pipe segments made of UHPC have the advantages of high strength, good impermeability, and strong crack resistance, which can significantly reduce the thickness of the pipe wall, reduce the unit weight of the pipe segment, and improve the utilization rate of the channel cross-section. Previously, UHPC had only been used in small quantities in cable trenches and substation firewalls.

The China Electric Power Research Institute and State Grid Hubei Electric Power, etc., established a special research team to continuously carry out technical research on the application of UHPC in cable tunnels. For a year, the research team successively completed the work of material optimization and proportioning, material performance testing, new pipe segment design, pipe segment preparation process research, and pipe segment mechanical performance testing.

Compared with conventional cable jacking pipes, UHPC cable jacking pipes can save 30% of material consumption. The application of UHPC cable jacking pipes can extend the service life of cable tunnels, reduce carbon dioxide emissions, and contribute to the construction of urban power grid channels.

The successful full-scale test of UHPC cable jacking pipes marks a significant breakthrough in the application of UHPC in the field of cable tunnels. UHPC cable jacking pipes are expected to be widely used in the construction of urban power grids in the future, providing a more efficient, safe, and environmentally friendly solution for urban power supply.

In addition to the above, here are some other key points of the article:

UHPC is a new concrete material with high strength, good impermeability, and strong crack resistance.

UHPC cable jacking pipes can significantly reduce the thickness of the pipe wall and the unit weight of the pipe segment.

UHPC cable jacking pipes can extend the service life of cable tunnels and reduce carbon dioxide emissions.