In summary, as is known in the construction industry, hydraulic demolition uses high pressure water to remove the underlying metal support structure or the reinforced surface concrete.
Prior to considering hydraulic demolition (Local Demolition Companies Melbourne) as a reliable alternative, the preferred technique for removing surface concrete was to use a pneumatic hammer or chisel in some sensitive areas. This highly destructive technology is now obsolete because it eliminates good and bad concrete. It can also damage sound, sound reinforcement, concrete and other steel bars, and damage the hammer operator.
In summary, you should not use destructive pneumatic methods to remove damaged surface concrete:
- Armor damage
- Long-term damage to the bond between concrete and deeper bars.
- Can create new microcracks and subsequent weaknesses
- No selective elimination: it is all or nothing
- This is hard and dangerous
- It is very slow and very noisy
Finally, it is more expensive (total cost)
About hydraulic demolition
The implementation of hydraulic demolition (Local Demolition Companies Melbourne) is not an easy task or a simple task, but it can be very effective in terms of end results and cost-effective solutions.
There are two main types:
- Conventional or manual
- Robot hydrofoil
Conventional hydraulic demolition
Traditional hydraulic demolition (Local Demolition Companies Melbourne) has traditionally involved the operator holding a spear.
Hydraulic demolition uses 20 liters of water per minute at a pressure of 2,500 bar and pushes 25 to 30 kilograms of reaction force into the body. This means that this method can be dangerous, just like the approach of a pneumatic hammer, it is also a hard and monotonous manual labor.
This means that due to physical needs, operators can only stay for 10 or 15 minutes without a break or rest. As the workday progresses, the operator feels tired and an accident occurs.
Therefore, traditional hydrodemolición can and must be used only for short-term small jobs.
For larger jobs, robotic hydraulic demolition is a more efficient and safe solution.
Hydraulic demolition is a fast and efficient way to remove concrete from the energy of high pressure water without damaging the surrounding structure and built-in reinforcement.
The high pressure water jet is directed to the concrete surface where it enters the holes and microcracks. When the water pressure in the hole exceeds the pressure of the concrete, there is a small “burst” that destroys the concrete.
Damaged concrete is usually weaker than high-quality concrete, so selective removal can be achieved with the right configuration. This means that all damaged and weak concrete is removed and the sound of the concrete is forgotten.
The hydraulic demolition (Local Demolition Companies Melbourne) robot ensures that the concrete surface is systematically exposed to the water jet. Therefore, since the robot simultaneously “measures” and removes the concrete, the required extraction depth cannot be accurately specified.
When using a robot, you can expect a working rate of 0.3 to 0.4 cubic meters per hour, a large increase in manual methods, especially for sensitive areas that may be needed in another way with hand scissors.
The operator is far from the work done, so it is not subject to the physical limitations of the manual device and does not harm himself by stealing the remains, as the robot’s working head is completely hidden.
Because it is programmable, it is easy to reproduce the work of the robot. This means that the same cutting depth can be performed in a given area of concrete in a predictable time. As a result, project management has been improved because time scales can be calculated more accurately.
By subcontracting work to experts who work with equipment and operators, it is possible to circumvent potentially expensive training and maintenance requirements for robot hydraulic removal. While the main cost sometimes seems expensive, a comprehensive assessment of the package usually shows a considerable overall savings.
The industry trend is dehydration, and the Concrete Maintenance Association has put forward a guide that states: “Whenever possible, hydraulic demolition should be the preferred method for concrete demolition”.
The 2005 Work Vibration Control Regulations (Vibration Regulations) also describe legislative changes.
Therefore, the use of hydraulic demolition technology to treat defective concrete meets legal requirements and recommends the use of best industrial practices.