Esti Hydropower Plant


Project Information: Conveyance tunnel of 4,500 m in length. Demolished due to building defects and land swelling. Work consists of the design and build of definitive repairs, covering, plating and new access points to the tunnel to allow the Esti plant to start operations. No swelling has been detected – seems to be due to red agglomerate washout aggravated by dewatering. These are emergency works. 80,000 m3 of concrete. 500 HEB 160 trusses. 84,300 Kg consolidation injections. 14,000 m3 demolition excavation. 7,120 units of 4 m MN16 swellex bolts.

País: Panamá
Provincia: Chiriquí
Municipio: David
Montera: 400 m


  • Simple tunnel of 9 m diameter and 4.5 km in length + 2 50 m² ADIT

Método Constructivo:

  • Drill & Blast. Execution of support repairs. Cement covering with steel fibres.

Geología y Geotecnia:

  • Volcanic sandstone. Tuffs and conglomerates with montmorillonite inserts.

Maquinaria Empleada:

  • Atlas Copco Jumbos XE3C, L2C
  • Robots PM500
  • CAT 320 backhoes
  • Manitou platforms