Manhole covers are an essential component of the UK’s drainage and sewerage infrastructure, providing access to underground systems for maintenance and repair. They are typically constructed from a range of materials including cast iron, ductile iron, composite materials, and reinforced concrete and can weigh anywhere from 10kg to over 300kg.
There are a number of different methods for lifting manhole covers, including the use of hydraulic jacks and keys. In this blog, we’ll take a closer look at these methods and explore the best practices for safely lifting manhole covers.
Types of manhole covers
Before we dive into the lifting methods, it’s important to understand the different types of manhole covers that are commonly used in the UK. Here are the four main types:
- Cast iron: These are the most common type of manhole cover and are typically used in areas with low traffic volumes. Cast iron covers are durable and long-lasting, but they can be heavy and difficult to lift.
- Ductile iron: These covers are similar to cast iron covers but are designed to be lighter and more durable. They are often used in areas with higher traffic volumes.
- Composite materials: These covers are made from a combination of materials, including resin, fiberglass, and carbon fibre. They are lightweight and easy to handle, but may not be as durable as cast iron or ductile iron covers.
- Reinforced concrete: These covers are typically used in areas where heavy-duty covers are required. They are extremely heavy and require specialized lifting equipment.
Lifting methods
Now that we’ve covered the different types of manhole covers, let’s take a closer look at the lifting methods.
Hydraulic Jacks
Hydraulic jacks are a popular method for lifting manhole covers. They work by using hydraulic pressure to lift the cover off the frame. Here’s how to use a hydraulic jack to lift a manhole cover:
- Assess the weight: Before you begin, you’ll need to determine the weight of the manhole cover. This will help you select the appropriate jack for the job.
- Position the jack: Position the jack directly over the manhole cover, making sure that it’s cantered and stable.
- Pump the jack: Using the pump handle, begin pumping the jack until the cover starts to lift off the frame.
- Remove the cover: Once the cover has been lifted, use a pry bar to remove it from the frame.
- Secure the cover: Make sure to secure the cover in a safe location while work is being carried out on the manhole.
Hydraulic jacks can be a safe and effective way to lift manhole covers, but they do require some skill and experience to use properly. It’s important to follow the manufacturer’s instructions carefully and to take all necessary safety precautions.
Manhole Cover Keys
Manhole cover keys are another common method for lifting manhole covers. They work by using a hook or claw to grip the cover and lift it off the frame. Here’s how to use a manhole cover key:
- Assess the weight: As with hydraulic jacks, you’ll need to assess the weight of the manhole cover before you begin.
- Position the key: Position the key over the manhole cover, making sure that it’s cantered and stable.
- Hook the cover: Use the hook or claw to grip the cover and lift it off the frame.
- Remove the cover: Once the cover has been lifted, use a pry bar to remove it from the frame.
- Secure the cover: As with hydraulic jacks, make sure to secure the cover in a safe location while work is being carried out on the manhole.
Planning and safety
Before attempting to lift a manhole cover, it’s important to plan the work carefully and to take all necessary safety precautions. Here are some key things to keep in mind:
- Assess the risks: Before you begin, assess the risks associated with the work, including the weight of the cover, the condition of the frame, and the location of the manhole.
- Use appropriate equipment: Make sure to use the appropriate lifting equipment for the job, and to follow the manufacturer’s instructions carefully.
- Wear protective gear: Wear appropriate protective gear, including gloves, safety glasses, and a hard hat.
- Secure the surrounding area: Make sure to secure the surrounding area to prevent any accidents or injuries.
- Have a plan for the cover: Make sure to have a plan in place for the cover once it has been lifted, including where it will be placed and how it will be secured.
Lifting a manhole cover may seem like a simple task, but it’s important to take the necessary precautions to ensure that the work is carried out safely and efficiently. By assessing the risks, using the appropriate equipment, and following best practices, you can ensure that the job is completed without incident.