📋 Tender Overview
A green bridge is under construction on the Turku ring road close to the Turku-Helsinki motorway junction. The Green Bridge also known as the Game Bridge provides a safe crossing for animals. Although the bridge is covered with soil and vegetation beneath them is an ordinary cast bridge consisting of two tunnels and of the reinforced concrete continuous vault type. The bridge is cast curved to provide better load-bearing capacity with less structural thickness. The length of the bridge is 39 meters long.Panu Salminen who graduated as a civil engineer last autumn started the Turku ring road project in March this year and will act as the right hand of the concrete foreman in casting the bridge. He has been working at Destia since 2018. Panu describes the casting as follows- There are three things in casting that make it challenging compared to a regular bridge. Due to the shape of the bridge casting must be performed slowly so that the stress on the molds does not increase too much. This means that due to the ascending shapes of the bridge a lot of pressure really builds up in the molds and support structures below if too much concrete is taken in at once. For the same reason compacting the concrete i.e. vibrating produces some pain. The mold rises sloping from the bottom up making it difficult to get the vibrator in every place because it is normally hung vertically from top to bottom. Lastly making the concrete surface smooth during the finishing work of the casting requires special precision because the concrete surface is curved.Casting a bridge requires patienceThe castings of the green bridge next to the private roads in Peltola - a total of four castings - were completed in mid-October. One casting lasted about 16 hours and took about 29 automotive concrete. In total about 1400 cubic meters of concrete and about 200000 kilograms of brushed steel are used for the bridge.- Double rubber bitumen insulation will be built on top of the casting on top of which soil layers road construction layers will be added and in addition trees and shrubs will be planted on the game passage and demarcated on Peltolas private road with game fences Panu continues.The Green Bridge will not be completed for the passage of animals until the summer of 2021 as the insulation layers will not be able to be laid until the spring when the air humidity will decrease.
