Open shield tunnel boring machines

Execution of open shield tunnel boring machines (TBMs)

The execution of open shield ramming at Eurohinca is performed using a specialized shield that integrates a drilling element adapted to the characteristics of the terrain. Depending on the type of terrain, the shield can incorporate different tools such as bucket, miner or pickaxe, ensuring effective and precise drilling. This approach allows controlled and efficient excavation, adapting to ground variations with flexibility and precision.

Open shield excavation process

During the process of open shield excavationIn the case of the shield, the extraction of the material is carried out using trolleys, while the shield is guided by means of guiding cylinders. The moving part of the machine is precisely adjusted thanks to a laser system that strikes a target and levels that provide constant information on the trend of the excavation. This advanced technology ensures accurate control and precise alignment, improving the efficiency and safety of the driving process.

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Frequently asked questions about open shield TBMs

What is an open shield ramming?

Open shield drilling is an excavation technique in which a specialized shield is used to drill into the ground. The shield is equipped with a drilling element adapted to the type of ground, such as a bucket, miner or pickaxe, and allows excavations to be carried out in a controlled and safe manner.

How to select the type of drilling element for the shield?

The type of drilling element is selected according to the characteristics of the ground to be excavated. It is chosen between bucket, miner, pickaxe, among others, depending on factors such as the hardness of the soil, the presence of rocks or the composition of the ground, to ensure effective drilling.

How is the extraction of material during excavation performed?

The extraction of material is carried out by using wagons that transport the excavated material out of the work area. The shield advances as the wagons are filled and removed, maintaining a continuous flow of material and avoiding excessive accumulation in the excavation area.

What technologies are used to guide the shield during excavation?

Guidance cylinders are used to guide the shield, allowing the direction of the shield to be precisely adjusted. In addition, a laser system is used to hit a target and levels to indicate the trend of the excavation, ensuring that the shield remains aligned and in the correct direction.

What are the advantages of using an open shield in excavation?

The use of an open shield allows for efficient and controlled excavation, adapting to different types of terrain and minimizing the impact on the environment. The technique provides greater stability during excavation, reduces the risk of collapse and allows work to be carried out safely in urban or congested environments.

What are the main challenges of using the open shield technique?

The main challenges include the need for accurate selection of the drilling element according to the terrain, managing the stability of the surrounding ground and coordinating the material removal process. In addition, the technique requires rigorous control through guidance technologies to maintain accuracy during excavation.