Medium Duty Manhole Cover: Adaptability and Maintenance Strategy

Medium Duty Manhole Cover is a key component used in urban infrastructure to cover underground pipeline wellheads, mainly suitable for scenarios with moderate loads. The following will be introduced from multiple aspects:

1、 Basic Definition and Function

Medium duty manhole cover is a type of manhole cover classified according to its bearing capacity, usually meeting the D400 level in international standards, with a designed bearing capacity of 40 tons of dynamic load. Its core functions include:

Safety protection: Prevent personnel from falling and debris from entering underground pipelines.
Load support: Bear the passage of small and medium-sized vehicles and pedestrians.
Environmental isolation: Reduce odors, rainwater backflow, and pest invasion through sealed design.

2、 Core Features

1. Performance
Ductile iron:
High strength: The tensile strength can reach 400-500 MPa, with better toughness than ordinary cast iron and strong impact resistance.
Corrosion resistance: Surface hot-dip galvanized treatment, suitable for humid and slightly corrosive environments.
Economy: Moderate cost, low recycling value.

2. Structural design
Bearing structure: The surface is designed with anti slip patterns to reduce the risk of slipping during rainy and snowy weather; Internally, "well" shaped or radial reinforcement bars are used to distribute loads and enhance stiffness.
Sealing and connection: Rubber sealing rings are embedded at the edges of medium duty manhole covers to prevent dust, odor, and displacement; It is fixed with bolts or hinged to the well seat, and some models are equipped with anti-theft locks.

3、 Application scenarios

Municipal roads and transportation: Urban secondary roads, branches, and sidewalks, carrying small and medium-sized vehicles; Parking lots and commercial roads meet the frequent traffic demand.

Residential communities and public facilities: Covering water supply wells, sewage wells, gas wells, suitable for the passage of cars and non motorized vehicles in residential areas. Schools, parks, and other public places should balance safety and aesthetics.

In the field of industry and light industry: Internal roads and logistics channels in factories, carrying light trucks and forklifts. Clean workshops such as food and pharmaceuticals use stainless steel or composite resin manhole covers to meet hygiene standards.

Special environment:In coastal areas or acid rain areas, corrosion-resistant composite resin or stainless steel manhole covers should be selected. Customized Cast Iron Manhole covers are used in historical districts or scenic roads to integrate into the surrounding environment.

4、 Common faults and solutions

Abnormal noise or jumping: Due to settlement of the foundation or excessive clearance, it is necessary to pour new concrete foundation or adjust the position of the well seat.
Leakage: Replace the aging sealing ring or supplement the sealant.
Damage and cracking: If the bearing capacity exceeds the limit or the material is aging, the manhole cover needs to be replaced as a whole.

Medium duty manhole covers have become the mainstream choice in urban infrastructure due to their moderate load-bearing capacity, wide environmental adaptability, and economic cost. Its design needs to balance functionality and sociality, effectively ensuring the safety of underground pipelines.