Manhole Covers
The Manhole Covers Manufacturer!
KSHD brand was established in 2008 in Qingdao, China, specializing in the R&D, manufacturing and sales of urban furniture. The factory has more than 16 years of advanced management and production experience. Our main products are metal trash cans, bollards, bicycle racks, outdoor benches, picnic tables, ashtrays and many other outdoor town furniture.
Why choose us
Advanced equipment
The company has advanced laser cutting machines, CNC punching machines and other automation machines.
Production market
The products sell well in Spain, Britain, Europe, America and Australia. To achieve friendly cooperation with companies from many countries and regions.
OEM service
With professional design, production and sales teams. Samples can be customized according to your drawings, and quality control and inspection will be carried out to meet your requirements.
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Product |
Metal square tree grate |
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Material |
Steel, Stainless steel, etc. |
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Size |
Ø1000/ 1200/ 1500/ 1800 mm |
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OEM/ODM |
Yes |
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Features |
Thickened, stable and weather-resistant. |
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Model |
KSX020 |
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Certificate |
ISO & CE |
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Usage |
Streets, gardens, parks, schools, etc. |
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Brand |
KSHD |
Materials Used for Manhole Covers
Concrete: Concrete is the primary material used for constructing manholes. It is known for its strength, durability, and resistance to environmental factors. Reinforced concrete is often used to provide additional strength and load-bearing capacity.
Cast Iron: Cast iron is frequently used for manhole covers and frames. It is known for its durability, resistance to heavy loads, and protection against unauthorized access. Cast iron covers are often designed with specific load ratings to withstand the weight of vehicles or pedestrians.
Brick or Masonry: In some cases, brick or masonry construction may be used for manholes, especially in older systems. Bricks are commonly used for the walls and benching inside the manhole, providing structural support and stability.
Plastic: Certain manholes may use high-density polyethylene (HDPE) or other plastic materials, particularly in corrosive soil or chemical environments. Plastic manholes offer resistance to corrosion and are lightweight, making them easier to handle and install.
Composite Materials: Fiberglass-reinforced plastic (FRP) or composite materials are gaining popularity in manhole construction due to their corrosion resistance, lightweight nature, and durability. These materials offer advantages over traditional materials in terms of longevity and reduced maintenance.
Grout or Mortar: Grout or mortar fills gaps between precast concrete sections or bricks in manhole construction. It helps to provide stability, prevent water infiltration, and ensure a tight seal between different components.
Bituminous Materials: In some cases, bituminous materials like asphalt or bitumen may be used for the base or floor of manholes. These materials provide a smooth surface, help to prevent groundwater infiltration, and offer resistance to chemical attacks.
Purposes of Manhole Covers
Protection for Underground Utilities purpose that manhole covers serve as the protective device to shield the underground electrical system, water pipelines, sewage systems, and telecommunications against unwanted debris, contaminants, or tampering by sealing off entry points for weather elements, accidents, or unauthorized access.
Safe Access for Maintenance Utility workers often enter manholes to carry out repair and maintenance. Manhole covers are a safe and controlled access point for experts to review, maintain, and do fixes on such networks as sewage, electrical cables, or pipelines to keep the city's infrastructure in motion.
Load-Bearing StrengthManhole covers and frames carry heavy loads, particularly those on roads. Any mishap would occur if the cover could not bear the weight of passing vehicles. The more the volume of traffic flowing through a place, the higher is the requirement for strong covers that do not compromise the safety and functionality of the roads.
Prevention of Surface Water Infiltration By sealing off manholes, these covers prevent rainwater or surface runoff from entering the underground systems. This helps reduce the load on the drainage network, especially during heavy rains, and prevents potential flooding or water contamination.
Enhanced Aesthetic and Structural Integration Manhole covers and frames can be designed to blend seamlessly with surrounding surfaces, whether it's roads, pavements, or landscaped areas. Some covers are also branded or marked with the municipality's logo, adding a touch of urban identity to the cityscape.
Types of Manhole Covers
Solid Top Manhole Covers
Solid top manhole covers are usually made of ductile iron, concrete, or steel. However, ductile iron has gained popularity due to its excellent strength and toughness. Ductile iron has a flat and solid shape with no open ends, and they are installed above the manhole frames.
Ventilated Manhole Covers
Ventilated manhole covers are the ones that are usually manufactured using ductile or cast iron, and perforations or mesh designs are incorporated for air passing. This design helps avoid any pressure rise or allows any gases from the belowground systems.
Recessed Manhole Covers
Recessed Manhole covers are provided with a depression or groove to the cover creating a lip. They are generally made from concrete or ductile iron and include a recess in the area in which a filling material, usually asphalt or concrete, is placed.
Double Triangular Manhole Covers
Double triangle manhole covers have interlocking two triangular designs. Generally, these covers are made of ductile iron or cast iron to provide them strength and endurance. The advantages associated with them are that the sections are triangular and easy to handle compared to large solid covers. The weight of each piece is lower, hence easy to install through a manhole cover hook and simple to remove.
Locking Manhole Covers
Locking manhole covers lock in position by denying access unless authorized. It is made from either very hard ductile iron or reinforced steel material. In simple terms, a locking system can be a handful of bolts that secure the cover in place or a sophisticated key-operated system.
Weight Classes for Manhole Covers
A15 = Pedestrian and cyclist Utility
B125 = Occasional light traffic and driveway duty
C250 = Slow movement of cars and vans( For example in car parks)
D400 = Main road traffic-fast moving traffic
E600 = Heavy duty traffic like in warehouses, docks, etc. Movement with solid heavy tyres
E900 = For areas with heavy duty loads eg. In airports
Test Manhole Cover
Non-destructive Testing
This test involves radiographic examination and ultrasonic testing.
They measure the internal thickness as well as the internal integrity of the casting.
Radiographic testing determines the casting's internal integrity.
Metal Testing
This test is done to determine the physical properties of a manhole cover.
It will show whether the device is strong or brittle or long.
Measurement Assessment
This test helps determine if the measurements of the manhole cover are accurate.
Leak Test
A manhole cover leak test is done to determine if the device is leaking or not before it is released into the market.
It involves pouring water into the gap between the casting and the manhole cover.
If the water disappears into the manhole then it is leaking.
If it stays in the gaps, it is not leaking.
Casting Bar Test
This test assesses the ductility and strength of the cast irons used to make manhole covers.
One uses casting bar test specimens from the specific metal used to cast the manhole covers.
You place the bars into a tensiometer which then pulls on the ends up to the point when they break/elongate over their elastic limit.
Ductile cast iron withstands between 2% – 10% elongation before it eventually breaks.
FAQ
As one of the leading manhole covers suppliers in China, we warmly welcome you to buy high-grade manhole covers for sale here from our factory. All customized products are with high quality and low price. Contact us for quotation.
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