With the increasing sophistication of urban underground pipeline networks today, the performance and reliability of inspection chambers, as critical nodes connecting various pipelines, are directly related to the safety and durability of municipal facilities. Traditional inspection chambers commonly suffer from issues during long-term use such as frame settlement, road surface cracking, and manhole cover noise, while ordinary ductile iron covers often lack sufficient coordination with the road surface due to structural design flaws. The Luzhongbao 700×900×110 Ductile Cast Iron Round Manhole Cover With Snap Ring, based on innovative anti-settlement technology and a spring-clip structural design, successfully solves these problems through a cooperative load-bearing mechanism between the frame and cover, and has now become the product of choice for urban arterial roads and high-traffic load areas.
This circular manhole adopts an optimized structure of 700mm inner diameter × 900mm outer diameter × 110mm height. The cover and frame are tightly connected via a spring-clip self-locking system, forming an integrated load-bearing system. Its core design uses the pressure-bearing edge extending from the bottom of the frame to disperse loads directly to the asphalt pavement layer, avoiding direct pressure on the brick masonry well structure. This design not only solves the settlement problem of traditional frames caused by insufficient concrete fixation but also achieves noise reduction and shock absorption through an embedded rubber strip and U-shaped groove buffer structure, significantly improving driving comfort and road safety.
Structural Innovation: Load Dispersion and Cooperative Load-Bearing
The greatest advantage of the Luzhongbao Ductile Iron Circular Manhole lies in its anti-settlement structural design. The frame fully adheres to the road surface layer, transferring vehicle loads to the road surface layer through the bottom pressure-bearing edge, rather than acting directly on the brick masonry well. This design effectively avoids the problem of insufficient compaction of the pavement around the manhole, fundamentally preventing uneven settlement. Simultaneously, the cover and frame use a three-spring-clip self-locking system, achieving automatic locking through spring arms, incorporating anti-displacement and anti-bounce functions, significantly enhancing the stability of the cover under dynamic loads.
Multi-functional Integration: Safety, Quietness, and Durability
1. Anti-theft and Safety: The cover achieves physical anti-theft through a hinge shaft and pin fixation structure, requiring special tools for opening. Furthermore, the surface uses an anti-slip pattern design to improve driving safety in rainy or snowy weather.
2. Noise Reduction and Shock Absorption: A T-shaped synthetic rubber strip is embedded in the U-shaped groove of the frame, using flexible material to absorb the impact force of collisions between the cover and frame, overcoming hardness with softness, and eliminating noise generated by passing vehicles.
3. Corrosion Resistance and Long Service Life: The ductile iron material itself has high strength and toughness. Combined with epoxy asphalt coating or galvanizing treatment, it can resist corrosion from rainwater and de-icing agents, with a design life exceeding 20 years.
Construction Convenience and Economy
Traditional frames require concrete pouring for fixation and have a long curing period, whereas the Luzhongbao Spring-Clip Circular Manhole adopts a modular, assembled design. Installation does not require damaging the original road structure, and traffic can be opened immediately after construction. This rapid construction mode significantly shortens the project timeline and reduces traffic impact. From a whole-life-cycle cost analysis, although its initial investment is about 20% higher than ordinary covers, due to its minimal maintenance requirements and long service life, the comprehensive cost is instead reduced by over 30%.
Application Scenarios and Engineering Verification
This product has been widely used in heavy-duty traffic areas such as urban arterial roads, expressways, and airport runways. For example, in projects like Ouhai Avenue and Tangjiaqiao South Road, the covers showed no settlement or damage after long-term use, with the integrity rate of the surrounding pavement exceeding 95%. Its standardized interface design can also adapt to various pipeline network systems, demonstrating strong compatibility.
Summary
The Luzhongbao 700×900×110 Ductile Cast Iron Round Manhole Cover With Snap Ring, with its anti-settlement structure, multi-functional integration, construction convenience, and long-term economy, has become an indispensable key component in modern municipal engineering. Choosing this product is not only a guarantee of road quality and safety but also the practice of the concept of sustainable development for urban infrastructure. This is the core reason for its continued recognition in the fiercely competitive market.