The cutting module of a hydromill, also known as a slurry wall cutter, is a robust, heavy-duty steel frame equipped with rotating cutter wheels driven by hydraulic motors.
This module is responsible for excavating soil or rock, mixing it with slurry, and conveying it to the surface. The module is designed to maintain verticality during excavation, often incorporating steering flaps and sensors for precise control.
Here's a breakdown of the key components and their functions:
1. Steel Frame:
The foundation of the cutting module, providing structural support.
Houses the cutting mechanism and other essential components.
Designed for durability and to withstand the forces of excavation.
2. Cutter Wheels:
Two or more rotating cutting wheels, typically with teeth, that break up the soil or rock.
Driven by hydraulic motors, providing the necessary torque and speed for excavation.
Can be customized with different teeth and sizes to suit various ground conditions.
3. Hydraulic Motors:
Power the rotation of the cutter wheels.
Offer high torque and speed, enabling efficient excavation.
Their position ensures they are directly subjected to the stresses of the excavation process.
4. Steering Flaps/Plates:
Used to correct the verticality of the module during excavation.
Allow for adjustments in both longitudinal and perpendicular directions to the diaphragm wall.
Some modules feature simultaneous or independent tilting plates for enhanced verticality control.
5. Suction/Flushing Pump:
Pumps slurry (a mixture of bentonite and water) into the trench to stabilize the excavation and remove excavated material.
A powerful pump that ensures efficient removal of soil and rock.
6. Control System:
Includes sensors and instrumentation for monitoring and controlling the hydromill's operation.
Provides real-time feedback on parameters like verticality, depth, and cutting performance.
7. Guide:
Mounted on the frame to guide the module during excavation.
Their thickness varies depending on the panel dimensions.
8. Sensor Box:
Houses the control instrumentation and sensors for verticality control.
In essence, the cutting module's body is a sophisticated piece of machinery designed for precise and efficient excavation of deep diaphragm walls, ensuring verticality and stability throughout the process.
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