The regional highway Augšlīgatne-Skriveri (P32), in two stages from Madliena to Skrīveri (47.20 ° -60.29 km and 61.27 ° -71.27 km), is currently undergoing major road repairs on the national road network. During the reconstruction of roads, from 49.50.-50.00. km is found in weak low-bearing soil – the peat area with a peat layer at a depth of 10 meters. This was revealed by additional research conducted by AS "Ceļuprojekts", the designer also proposed possible solutions for soil stabilization.
To stabilize this land, the construction of combined columns and pile columns is used for the first time on the national road network. 30 cm wide and up to 6 m long concrete columns are built, and above that – 60 cm wide gravel / crushed stone columns up to 2 m long. A total of 952 columns will be built, which will be set up in a grid of 2.5 x 2.0 m. In order to carry out this work, a team of specialists from the Polish company Menard Polska will arrive with the necessary equipment in Latvia. . Today in Madliena, in the field of road construction, the media and industry representatives were introduced into this construction method, said Gints Alberiņš, director of the Construction Department of the Latvian State Roads (LVC), and Menard representative in Latvia Pēteris Šķēls and project manager from Menard Polska Andrzej Muszynski.
When designing a road section for a renovation, the designer drilled only up to four meters deep. These drills showed no weak bearing capacity, so it was assumed that low-bearing soil had already been replaced. However, it turned out that there is an overgrown lake under the overgrown ground. Suspicion arose as a result of construction work, and this was confirmed by thorough investigation. It turned out that there is both peat and mud under the thick gravel layer. Consequently, it is clear that with more traffic and more traffic the road can be distorted and the investments made will not be sustainable. "This is the first object on the national road network, where we use such technology, but successful implementation of this project, the construction of poles and combined columns in road facilities could be continued in the future, in this case costs would also be can be reduced because not only specialists from Poland came for this project, but also added technology, which is an extra cost.More use of this method in Latvia could be applied to entrepreneurs in the field, "said Gints Alberiņš , director of the Construction Department of LVC, comment on the chosen technology.
To solve the problem of low capacity, there were two possible options:
– The excavation of a weak load capacity to a depth of up to 10 meters on a sufficiently wide area of the road track, which also includes existing communication. Not only is it expensive, but it also has the risk that the bottom of the road vibrates along the road. In addition, underground replacement requires time to settle and stabilize, which means that it would not be possible to continue construction work and complete this season. The use of this method would cost almost € 1 million (excluding VAT);
– Apply a new technology that until now has not been applied to the national road network and reinforces the ground with piles. Similar technology is used for the foundation of bridges and buildings, but so far there have been no such experiences on the roads in Latvia. The cost of this method is almost 600 thousand euros (excluding VAT), and it is also possible with the construction of post and combined columns to immediately continue the construction of road pavements, without delaying the work of the entire road section.
Menard Polska (www.menard.pl) has extensive experience in improving soil conditions and groundwater treatment in a safe and efficient way for more than a decade. The company also belongs to one of the world's largest construction companies – Vinci Construction. Menard Polska has experience in strengthening and improving the foundations under both public buildings and underground, and offers solutions from project to sales.
On construction work on the road Augšlīgatne-Skriveri (P32)
From the Madliena to transhipment via the Tīnūži-Koknese (P80) (47.20-60.29 km) motorway, a completely new road layout with three asphalt layers will be constructed after reconstruction, safety barriers will be installed, a well-organized water drainage system and stops of public transport, bridges over Ogre and Lobi have been rebuilt. These works are carried out by AS A.C.B., their contract price is 10.7 million euros (VAT) with ERDF co-financing, and construction work is expected to be completed in autumn.
Construction works on the same road are also on the road from Tīnūži-Koknese (P80) to Skrīveri (61.27-71.27 km). For this phase, a new salt layer, a foundation of chips and three asphalt layers are planted. In addition, rainwater drainage and drainage will be installed in Skriveri, road lighting will be installed and electricity networks will be rebuilt, as will a steel channel across the bridge over Maizīte. These works are carried out by SIA Strabag and their contract price is nine million euros (VAT) with ERDF co-financing, which will be completed in the summer of next year.