EPB earth pressure tunnel boring machine
Excavation with EPB earth pressure tunnel boring machines (TBMs)
At Eurohinca, our EPB tunnel boring machines are designed to meet the challenges of excavating in difficult soils. This advanced equipment, also known as earth pressure shieldsThe excavation spoil located in the extraction chamber is used to maintain pressure on the tunnel face. This process avoids surface subsidence, protecting the surrounding infrastructure. The spoil is transported to the shaft by means of conveyor belts or wagons, while the extraction of the material from the chamber is carried out with an auger. By adjusting the speed of the screw and the force of the thrust cylinders, we maintain a constant pressure, ensuring a safe and efficient advance.
Advantages of using a tunnel with an earth pressure shield
Choose a tunnel with an earth pressure shield o EPB tunnel boring machine provides numerous benefits for subway projects. This method allows tight control of ground pressure during excavation, preventing collapse and unwanted displacement. Thanks to advanced technology, EPB TBMs efficiently handle muck and maintain constant pressure on the tunnel face, facilitating construction without affecting nearby infrastructure. The ability to work in soft or mixed soils, together with the transport of the material by conveyor or wagon, improves safety and reduces the environmental impact on the project environment.
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Frequently asked questions on closed shield TBMs
What is an EPB TBM and how does it work?
A EPB tunnel boring machine (Pressurized Earth Balance) is a type of earth pressure shield that excavates tunnels while maintaining a constant pressure at the tunnel face. It works by using the excavation spoil to balance the pressure and avoid subsidence. This type of TBM is ideal for soft or mixed soils, providing stability and safety during the excavation process.
What are the main benefits of using an EPB TBM?
The EPB tunnel boring machines offer several key benefits, such as precise control over ground pressure, which reduces the risk of collapse. In addition, they enable excavation in difficult terrain and tunnel construction with less impact on surface infrastructure. They also help maintain tunnel stability and facilitate efficient muck removal.
How is the pressure in the tunnel face controlled with an EPB TBM?
In a EPB tunnel boring machineThe pressure in the tunnel face is controlled by the use of rubble accumulated in the extraction chamber. This material helps to balance the pressure exerted by the ground. The spoil is extracted by means of a worm screw, and the speed and force of the thrust cylinders adjust the pressure to maintain tunnel stability.
What kind of soils are most suitable for using an EPB TBM?
The EPB tunnel boring machines are especially effective in soft, mixed or high water soils. This equipment is designed to handle challenging terrains in terms of stability and pressure, allowing tunnels to be constructed safely and efficiently in difficult conditions.
What technology is used in EPB TBMs to ensure accurate excavation?
The EPB tunnel boring machines use advanced technologies such as laser systems and levels to guide the shield and ensure precise excavation. These systems allow precise control of tunnel direction and alignment, optimizing the excavation process and minimizing the impact on surface infrastructure.
What measures are taken to protect nearby infrastructure during excavation of an earth pressure shield tunnel?
To protect nearby infrastructures during the excavation of a tunnel using earth pressure shield o EPB tunnel boring machineIn addition, the tunnel face pressure is meticulously controlled and the ground is continuously monitored. The accumulation and transport of muck, along with precise adjustments in auger speed and thrust cylinder force, help prevent subsidence and damage to surface structures.
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