Olmos Tunnel Project, Perú
Largest Tunnel of South America
With more than 20 km length, the Olmos tunnel is the largest of South America. It will be used to irrigate Peru's north coast, incorporating 43,500 hectares of farmland, creating 72.000 jobs and benefit to 350,000 people as well as hydropower generation in the near future.
Sika additives for concrete structures
Due to the complexity of the work, it was necessary to use different additive technologies from Sika Perú in order to ensure the quality and durability of concrete structures in this important project in Peru.
In hydraulic structures (25,000 m3) ViscoCrete Technology (Sika ViscoCrete 1110) with the Sika Fume (micro silica) was used. In concrete structures (18,000 m3) the Sikament series as Sikament 290N and Sikament 306 were used depending on the additives resistance.
Sika ViscoCrete technology
The concrete segments (10,000 m3), which are manufactured and where the TBM moves, have used the ViscoCrete technology with the additive Sika ViscoCrete 3330 accompanied by our steel fiber Sikafiber CHO 80/60 NB.
The shotcrete (38,000 m3) has been a challenge since at the beginning of the tunnel the distances were short. Furthermiore the excavation of the tunnel has been going on, the distances have increased and the time from mixing until the shotcrete launches has increased to 4.5 hours.
Cooperation with Norbert Odebrecht Construction
In 2004, Concesionaria Trasvase Olmos S.A, a subsidiary of Odebrecht won the concession of the Olmos Projects Water Diversion works. In 2006, Odebrecht Perú Ingenieria y Construction, started the construction this project. This company has been acting uninterruptedly in Peru for over 30 years and has executed the major works throughout the country contributing to the sustainable development of the regions where they act.
TBM Tunnel-Boring Machines
Crossing the Andes over 2000 m above the mountain trans-Andean tunnel, within 48 months, is a great challenge. Using conventional means of construction of underground works would be impossible. Challenged by this gold, the project acquired a machine TBM, specially designed for this challenge, has a cut hut of 5.33m in diameter and a total weight of the equipment exceeds 1000 tons and a total length of 320m. This machine has the necessary equipment for the drilling of trans-Andean tunnel that allows to execute the works in support and final lining of tunnel excavation in parallel with it.
For this task of managing the mix of shotcrete additives are used as super plasticizer Sikament 306, Sika Tard PE to keep the mixture cool without losing workability during transport and the pre-work to launch and during the launch our alkali free accelerator Sigunit series L-50 AF. It should be noted that the mix of steel fiber shotcrete has Sikafiber LHO 45/35 NB.
The Olmos Project
Due to the characteristics of the works, they are executed in parallel on two major fronts of work: East and West. The project, thus consists of the following sub-projects:
- Quebrada Lajas tunnel
- It is a lateral extension of the trans-Andean tunnel with 521 m long and a circular section of 17,68 m2. Has been excavated to allow the evacuation of water transferred from the trans-andean tunnel and Quebrada Lajas.
- Trans-Andean tunnel
Length of 20.11 km completely excavated of which 12.5 km are already excavated by TBM.
- Final Intake
Located upstream of the dam Limón, in the ravine The Donkeys, when the dam will use lemon rises to its final height of 85m. It consists of the excavation and support of a tunnel with a length of 1.12 km and a section of 24.36.m2.
Concrete structure with radial gates set to evacuate capacity 1740 m3 / s.
- Provisional Intake
Located at the Limón dam, has 02 gates of 42 m3/s and a conduit shielded 320 meters long and 3.50 m diameter, allows the interconnection with the Trasandino tunnel.
- North Peruvian Pipeline Relocation
Considering that the original location of the North Perú pipeline (carries crude from the jungles of Perú to the coast through the mountains with an extension of 856 km) generated a significant interference to the project, 5.5 km of it have been relocated.