Against the backdrop of continuous upgrades in urban road infrastructure, manhole covers, as critical components connecting underground pipeline networks and road surface systems, directly impact road flatness, traffic safety, and maintenance costs. Traditional manhole covers commonly suffer from quality issues such as settlement, abnormal noise, and bouncing, while ordinary ductile iron covers often lack sufficient coordination with the road surface due to unreasonable structural design. The 720×880×190 Ductile Iron Anti-Settlement Manhole Cover, based on innovative anti-settlement technology and optimized structural engineering, successfully solves these technical challenges through a special elastic fixing system and an reinforced design, and has now become the product of choice for key projects such as urban arterial roads and expressways.
This anti-settlement cover adopts a rectangular design of 720mm × 880mm with a reinforced height of 190mm. This specification is the result of rigorous road mechanics calculations and dynamic load analysis, achieving perfect integration with the asphalt pavement while ensuring load-bearing capacity. A unique elastic locking device and an adjustable fixing system allow the cover to self-adjust according to changes in road surface elevation, effectively preventing insufficient compaction of the asphalt around the manhole. The product uses high-grade QT500-7 ductile iron, combined with a scientifically designed reinforcement rib layout, ensuring both the mechanical performance of the product and optimal stress distribution. This is the fundamental reason for its widespread application in various road engineering projects.
Innovative Anti-Settlement Mechanism
This cover adopts a patented anti-settlement design concept. Through the synergistic action of a three-dimensional adjustable support and an elastic lining, the vertical load borne by the cover is effectively dispersed to the entire manhole frame base. The load is then transferred to the road structural layer through a specially designed load transfer path. This innovative design breaks the traditional load-bearing model where the cover and road surface are separate, integrating the cover and road surface into a complete load-bearing whole, fundamentally solving the common quality issue of pavement settlement around the manhole.
Exceptional Load-Bearing Performance
Verified by the National Road and Traffic Engineering Testing Center, the load-bearing capacity of this cover reaches D400 grade or above, with a test load exceeding 400 kN, fully meeting the usage requirements for urban arterial roads and expressways. The ductile iron material itself has a tensile strength exceeding 500 MPa and an elongation rate of over 7%. Combined with the scientifically designed reinforcement rib layout, the product offers both high strength and good toughness, capable of withstanding impact loads generated by repeated heavy vehicle traffic.
Excellent Durability
The product undergoes dual anti-corrosion treatment with epoxy asphalt coating and zinc-chromium coating, improving corrosion resistance by more than three times compared to ordinary products. The unique structural design effectively avoids vibration noise when vehicles pass. Its fatigue service life can exceed 1 million cycles, with a design service life of over 20 years, significantly reducing road maintenance frequency and upkeep costs.
Convenient Construction and Maintenance
The cover features a modular design. During installation, it only needs adjustment to the predetermined elevation before synchronous paving and rolling with the asphalt pavement. The special adjustable support design allows for direct elevation adjustment during maintenance of the road asphalt layer without replacing the main cover body, greatly saving maintenance costs and construction time. The product weight is optimized to ensure structural strength while facilitating on-site handling and installation.
Outstanding Safety Performance
The cover surface uses a three-dimensional anti-slip pattern design, with a friction coefficient reaching over 85 BPN, providing reliable anti-slip assurance even under rainy or snowy conditions. A professional anti-theft locking system ensures maintenance convenience while effectively preventing unauthorized opening. Additionally, the product features multiple safety characteristics such as anti-bounce and anti-displacement, comprehensively ensuring road traffic safety.
Significant Economic Benefits
From a whole-life-cycle cost perspective, this anti-settlement cover demonstrates significant economic advantages. Although the initial investment is about 30% higher than ordinary covers, its characteristics of extending road service life and reducing maintenance frequency can lower overall road maintenance costs by over 40%. Coupled with its ultra-long service life, the comprehensive economic benefit is highly substantial.
Extensive Applicability
This product can be widely used in various demanding working conditions such as urban arterial roads, expressways, airport runways, and port terminals. Its standardized interface dimensions can perfectly match mainstream inspection well systems domestically and internationally. The special waterproof design effectively prevents groundwater leakage, ensuring the safe operation of the underground pipeline network system.
Summary
The 720×880×190 Ductile Iron Anti-Settlement Manhole Cover, with its innovative anti-settlement design, exceptional load-bearing performance, excellent service life, and significant economic benefits, has become an indispensable key component in modern urban road construction. Choosing this product is not only a guarantee of road quality but also strong support for the sustainable development of urban infrastructure. This is precisely why it continues to gain the trust and recognition of all parties involved in engineering amidst fierce market competition.