Installation of drainage piping at Oliana Dam

Eurohinca has executed a project for the installation of a drainage pipe in the Oliana Dam.The work was carried out with the support of the water supply system, optimizing the hydraulic infrastructure without affecting its operability. The work was carried out with the dam completely filled with waterThis was a highly complex technical challenge. For this purpose, the Hydroshield DN1000 tunnel boring machineensuring a safe and accurate excavation to 18 meters deep.

Location and context of the project

The Oliana Dam is a key infrastructure in the regulation of the flow of the Segre River. Its maintenance and modernization require specialized interventions to ensure its operation without affecting its structural stability. The work consisted of the installation of a subway pipeline for the controlled evacuation of water from the bottom of the reservoir.

Characteristics of the work

Construction method: Hydroshield DN1000 remote-controlled boat
Depth of the outlet: 18 meters below water level
Type of dam: Concrete
Geology of the terrain: Rock and compact formations
Environment: Water infrastructure with restricted access conditions

Technical challenges

One of the biggest challenges of the project was the excavation in a submerged environmentwhere any inaccuracy could compromise the functionality of the drainage pipe. The excavation had to guarantee total impermeabilityThe system is designed to prevent seepage and ensure the stability of the surrounding soil.

Another challenge was the logistics of the operationThe dam's location and access limitations for moving heavy equipment and construction materials.

Solutions implemented

To address the challenges of the project, Eurohinca implemented the following strategies:
✔️ Use of Hydroshield DN1000 tunnel boring machinedesigned for drilling in high-pressure environments and rocky soils.
✔️ High-precision trajectory control systemsensuring a perfect alignment in the excavation.
✔️ Advanced sealing in the boreholeThe watertightness of the piping is guaranteed and unwanted leaks are prevented.
✔️ Logistics and operational coordinationensuring efficient execution in a difficult-to-access environment.

Results and benefits

The project was successfully completed, allowing the installation of the drainage system without altering the dam's operation or affecting the stability of the reservoir. Thanks to the use of advanced technology, the work was carried out with minimal impact on the environmentThe Oliana dam was designed to ensure optimum flow control and structural safety of the Oliana dam.

This project is a clear example of how the remote-controlled pile driving is an effective solution for modernization of hydraulic infrastructuresThe project will allow the improvement of drainage systems without affecting the integrity of reservoirs and dams.

References of executed works

In Eurohinca we are specialists in the execution of tunnels for pipelines with tunnel boring machines. Since its foundation in 1996 Eurohinca has executed different types of works:

International Experience