In English, "Human Hole Cover" is typically referred to as a Manhole Cover. A manhole cover is a removable plate covering the opening of a manhole, which provides access to underground utilities such as water, sewer, electrical, or telecommunications systems. It serves several critical functions:

1. Safety: The primary purpose is to prevent people, animals, or objects from falling into the manhole, creating a potential hazard.

2. Security: It also acts as a barrier to prevent unauthorized access to underground infrastructure.

3. Protection: It protects the underground infrastructure from environmental factors like weather, debris, and tampering.

4. Durability: Manhole covers are designed to withstand heavy loads, including vehicles passing over them, without breaking or causing damage to the underlying system.

5. Identification: Some manhole covers may be marked with identifying information, such as the utility company's logo or the type of service the manhole provides, for easy recognition and maintenance.

Materials

Manhole covers are typically made of strong, durable materials such as cast iron, steel, or concrete. Cast iron is a common choice due to its high strength, corrosion resistance, and ability to withstand heavy loads. Steel manhole covers offer similar properties but may be lighter and easier to handle. Concrete manhole covers are also used, especially in areas where weight is not a concern and cost is a factor.

Design

Manhole covers are designed to be easily removed and replaced for maintenance or emergency access. They often have a raised or recessed rim to help guide them into place and prevent them from sliding or rotating. Some manhole covers feature locking mechanisms or tamper-resistant designs to prevent unauthorized removal.

Installation and Maintenance

Installing a manhole cover involves placing it securely over the manhole opening and ensuring that it is level and properly aligned. Regular maintenance, such as cleaning and inspecting the cover for damage or wear, is essential to ensure its continued functionality and safety.

Importance

Manhole covers play a vital role in maintaining the safety and integrity of underground utilities. They protect against potential hazards, facilitate access for maintenance and repairs, and help to preserve the functionality of critical infrastructure.

In summary, "Human Hole Cover" in English is commonly known as a "Manhole Cover," an essential component of underground utility systems that ensures safety, security, and accessibility.