loading
This specialized power cable protection pipe is made from MPP as the core raw material, using extrusion molding to create an outer wall with a corrugated structure and a smooth inner wall. It is a structurally optimized version of conventional solid-wall MPP power pipes. While retaining the core advantages of MPP base material, such as insulation, temperature resistance, and corrosion resistance, it achieves mechanical optimization through a circular corrugated structure, resulting in "low wall thickness and high ring stiffness." It combines the ease of installation of solid-wall MPP with the external pressure resistance of reinforced MPP, making it ideally suited for buried power cable protection in medium-depth and medium-load conditions. It fills the gap in application scenarios between general solid-wall MPP and reinforced MPP, and is the preferred pipe material for medium-level power cable laying in municipal, industrial park, and building sectors.
The annular corrugations on the outer wall distribute external soil pressure, resulting in a ring stiffness 1.5 to 2 times higher than solid-wall MPP pipes of the same wall thickness. Standard ring stiffness grades are SN10, SN12.5, and SN16, meeting the load requirements for medium to deep burial depths. The corrugated structure also reduces raw material usage; at the same ring stiffness, the weight is 20% to 30% lighter than solid-wall MPP pipes, significantly reducing transportation, handling, and installation costs, highlighting its lightweight advantage.
The base material is modified polypropylene, which is non-conductive. Its dielectric strength and volume resistivity meet national standards for power conduits, effectively isolating stray currents from the soil and preventing cable leakage and short circuits. The smooth inner wall prevents scratching of the cable insulation during installation, providing safe protection for 10kV to 110kV high/low voltage cables and allowing for multiple cables to be laid in the same conduit.
Continuing the temperature resistance characteristics of the MPP base material, it can be used long-term in a temperature range of **-20℃ to 95℃**. There is no risk of brittle fracture in low winter temperatures in the north, and the local temperature rise from cable operation in high-temperature environments in the south will not cause the pipe body to soften. It has good resistance to UV aging; performance does not significantly degrade during outdoor storage or shallow burial, making it suitable for different climatic regions across my country.
The corrugated structure provides strong circumferential mechanical support, capable of withstanding static soil loads from 3-5m of overburden, as well as medium-level dynamic vehicle loads from residential main roads, industrial park secondary roads, and municipal secondary roads. The pipe body remains free from collapse and plastic deformation, preventing compression damage to internal cables, and meeting medium load requirements without the need for additional wall thickness.
The pure MPP polymer material does not react with acids, alkalis, salts, sulfides, or mildly corrosive media in the soil. It is rust-proof, non-swelling, and non-aging, and can be used stably in ordinary soil, mildly saline-alkali land, and conventional soil environments in industrial parks without any anti-corrosion treatment. The designed service life is over 50 years.
The corrugated structure gives the pipe a certain degree of axial flexibility and circumferential toughness, making it more adaptable than solid-wall MPP pipes to slight uneven settlement in soft soil foundations and reclaimed land areas. The pipe body is less prone to cracking, and the joints are less likely to detach, preventing cable protection failure due to minor geological deformation. It is suitable for medium-level laying in conventionally complex geological conditions.
It is lightweight, and conventional sizes (dn110~dn315) can be directly handled and laid manually. Large-diameter sizes (dn315~dn400) only require small lifting equipment; the connection method is fully compatible with solid-wall MPP pipes, using hot-melt butt welding, electrofusion socket welding, and rubber ring flexible socket welding. The process is simple and easy to operate, resulting in high on-site construction efficiency; the inner wall is smooth, and the friction resistance is low when threading cables through the pipe, greatly reducing the difficulty of pipe threading.
The matching rubber ring socket/hot-melt connections can achieve zero leakage sealing, effectively preventing sand and groundwater from entering the pipe, avoiding cable wear by sand and aging due to water immersion, and providing a fully enclosed protective environment for the cables; the corrugated outer wall is in close contact with the backfill soil, making pipe displacement less likely and providing greater laying stability.
The standard nominal outer diameters are DN110, DN160, DN200, DN250, DN315, and DN400mm, all of which are mainstream small and medium diameters for power cable laying. They are suitable for laying single/multiple high-voltage/low-voltage cables and communication optical cables. The specifications correspond directly to solid-wall MPP pipes, and can directly replace solid-wall pipes of the same specifications for medium-depth buried laying.
The raw material is environmentally friendly modified polypropylene, with no toxic or harmful substances released. Neither the production nor the use process will cause secondary pollution to the soil or groundwater; after the pipe is scrapped, it can be melted down and recycled, resulting in high resource utilization and meeting the building material requirements of municipal green engineering projects.
| Pipe Type | Core Ring Stiffness | Suitable Burial Depth | Load Adaptability | Key Advantages |
| Solid wall MPP power conduit | SN8、SN10 | ≤3m | Light load (sidewalks / residential area access roads) | Ultra-smooth inner wall for smoother pipe installation |
| Corrugated MPP power conduit | SN10~SN16 | 3~5m | Medium load (secondary roads / main roads within industrial parks) | High ring stiffness + lightweight design, offering excellent cost-effectiveness |
| Reinforced MPP power conduit | SN16~SN32 | ≥5m | Heavy load (main roads / railways / ports) | Extremely high resistance to external pressure, suitable for demanding working conditions |
1. Underground protection of 10kV~110kV high-voltage power cables in urban secondary roads, branch roads, and urban-rural fringe areas, with 3-5m of soil cover for municipal power branch/main pipe laying;
2. Pre-embedding of municipal power pipe networks in new urban areas, industrial parks, and business districts, for power lines with greater soil cover depth in new district road planning, balancing construction convenience and external pressure resistance;
3. Underground protection of municipal communication optical cables and broadcasting optical cables, and isolation protection for co-laying of power and communication pipes in the same trench, avoiding signal interference and meeting the co-laying requirements of medium-load road sections.
1. Power cable protection for main roads and surrounding roads in industrial parks, economic development zones, and logistics parks, with 3-5m of soil cover for factory power main pipe laying, adapting to the medium-level dynamic load of truck traffic in the park;
2. High-voltage cable protection from substations to production workshops in light industry and manufacturing factories, for underground cable laying in mildly saline-alkali land and ordinary corrosive soil in the factory area, eliminating corrosion maintenance and reducing factory engineering costs;
3. Power pipeline laying in non-core areas of mines and metallurgical parks, adapting to the medium-deep soil cover requirements of conventional geological conditions in mining areas, balancing toughness and external pressure resistance.
1. Power/communication optical cable protection in service areas, toll stations, and along the sides of roadbeds of expressways and national highways, with 3-5m of soil cover for transportation ancillary facility pipeline laying;
2. Pre-embedding of power pipes in surrounding roads, parking lots, and freight areas of high-speed rail stations and airports, adapting to medium-load conditions in non-core areas of transportation hubs;
3. Main power pipeline laying for township roads and county roads, balancing engineering costs and external pressure resistance, making it the preferred pipe material for township power grid upgrades.
1. Protection of power cables around outdoor main roads and underground garage entrances of residential communities, commercial complexes, and office buildings; laying of main power conduits in residential areas with 3-5m of soil cover, meeting the medium-load traffic requirements of fire trucks and engineering vehicles within the community;
2. Pre-embedding of power grid in main roads of schools, hospitals, cultural and tourism projects, and health and wellness communities; protective pipes for concentrated laying of multiple cables, with smooth inner walls that do not scratch the cables, and strong sealing and protection;
3. Laying of high-voltage cables from substations to buildings in large communities, replacing solid-wall MPP to achieve deeper soil cover protection and improve the pipeline's resistance to external pressure.
1. In areas prone to slight uneven settlement, such as soft soil foundations, reclaimed land foundations, and shallow silt foundations, municipal/park power branch pipes are laid, utilizing their flexibility to avoid pipe cracking;
2. In areas with slightly undulating terrain such as hills and mountains, power pipelines are laid naturally along the terrain; the resilience of the corrugated structure can adapt to small-angle pipeline bending without forced splicing.
Corrugated MPP power pipes are primarily designed for open-trench laying, but can also be adapted to short-distance, small-diameter conventional non-excavation crossing construction, such as directional drilling and pipe pulling across narrow rivers and small roads within residential areas (crossing distance ≤ 50m). It is not suitable for long-distance, large-diameter, and high-difficulty non-excavation crossings (this scenario is exclusive to enhanced MPP).
Corrugated MPP power pipe is a product precisely tailored to specific working conditions within the MPP power pipe family. Through its corrugated structure, it achieves "structural strengthening rather than raw material strengthening." Under medium-to-deep soil cover and medium-load conditions, it solves the problem of insufficient external pressure resistance of solid-wall MPP and avoids the high cost of enhanced MPP. It offers both excellent cost-effectiveness and suitability for working conditions, making it the mainstream choice for medium-level power laying in municipal, park, and building sectors, and a core pipe material for replacing solid-wall MPP in domestic power grid renovation.
