Description
The Mularroya dam is part of the Mularroya reservoir project located inside the municipal boundaries of La Almunia de Doña Godina, Chodes and Rilla belonging to the province of Zaragoza.
The dam is going to manage the water from the Grio River and the Jalon River basin for the irrigation of the lower Jalon area ensuring the water supply to towns and industry of the region. It moreover controls the environmental flow of the Jalon and Grio River.
This large project consists of the construction of the dam itself, the diversion dam at the Jalon River and a water tunnel between the rivers Grio and Jalon.
The dam with a maximum height of 82.5 m and an impoundment capacity of 103 hm3 is built with loose material. The Jalon River diversion dam is made of concrete with a length of 133.5 m. The 13 km long and 2.9 m wide connection tunnel between the rivers has a diversion capacity of 8 m3 per second.
ULMA Solution
ULMA supplied the formwork and the technical solutions for the construction of the concrete structure of the valve chamber and the intake tower.
The 55 m wide valve chamber was built mainly with ORMA modular formwork on Climbing Brackets 2000 and UCAB-EUC trusses. For the less thick slabs, RAPID slab formwork and ENKOFLEX beam formwork was used. The thick slabs (above 70 cm) were built with ENKOFORM H-120 slab formwork.
The 90 m high intake tower and valve chamber were built in climbing stages of 2 metres with the Climbing Bracket 2000 and the ENKOFORM V-100 timber beam formwork for the straight walls. The walls of the tower top which have at its last 10 metres a cylindrical geometry with a diameter of 13.5 m were built with FLECTOR circular formwork.
BRIO modular scaffolding was used as auxiliary working platform and access staircase to the intake tower.
