Risto Alttoa, Nordecon Betoon OÜ
Risto Alttoa, Nordecon Betoon OÜ
The first pre-tensioned box-beams with trapezoid cross section were cast on May 3 in Tamsalu factory of E-Betoonelement. The bridge beams will be used as edge beams in the deck construction of the overpass of Kroodi grade-separated interchange. The longest beam in the project has the length of 25,2 m. Manufacturing of beams in Tamsalu is successful due to good preparatory work and tight cooperation between the design and factory teams.
The principle of box-beam solution originates from Spanbeton, who is the leading Dutch manufacturer of pre-tensioned bridge beams and also a sister company of E-Betoonelement. The current length record of this type of beams is 61.75 metres. In the Netherlands box-beams are widely used, partially due to the speed of deck work – the load-bearing deck part of a bridge will be ready practically immediately after the assembly of beams and their mutual fastening with post-tensioning cables.
From this year’s May, AS E- Betoonelement offers its clients a hollow-core slab HCE500It is a new product in our product range as well as in the Estonian market.
The new hollow-core slab with a 500 mm high cross-section has a great load-bearing capacity and with the help of this slab it is possible to cover far longer spans than before.
If to this day the highest, 400 mm thick hollow-core slab can cover maximally 15 m long spans, then the new, 500 mm thick slab can cover up to 20 m long spans.
The concrete casting of the first 500 mm hollow-core slab began in Tamsalu plant of E-Betoonelement on 03.05.2011 at 11:00.
The technical data of HCE500 are available soon in the product catalogue on our homepage.
CABRO division participates in Tartu in Maamess, which takes place on the 14 – 16 of April. At the fair, different agricultural products from precast concrete are introduced, but mainly the Acontank™ tanks.
Further information at: http://www.tartunaitused.ee/maamess/index.html
See you at the fair!
|Magazine, Ehitaja, March 2011|
|Magazine Ehitaja, March 2011 Concrete -better thanks to its versatile features and various finishing options, it has also been widely used in building architecture and facade design. A good example is graphic concrete - a novelty that allows you to apply a wide range of patterns and even photos to the concrete surface.
During its long development, concrete has developed into more than just a mixture of cement, water and filler.
Sometimes graphic concrete is also called photobetone.
Unlimited options for creating images
Graphic concrete is a special type of washed concrete. The pattern for decorating the facade is printed with a concrete retarding agent for a special film material using a silk-screen technique.
In the uncovered places of the decalcifying agent, a smooth concrete surface, or shape surface, is visible.
The option is unlimited - from simple, standard patterns to individual patterns, designed specifically for the customer's design or photo.
Putting the photo on the concrete is the most complicated
The most difficult of graphic concrete is to apply the photo to concrete.
Different patterns can be used with different-acting retarders, thus achieving a concrete surface with different wash depths.
Looking at the graphic concrete from a distance, we perceive the pattern and the pattern applied to it as a whole, for example, we recognize a photo or image.
Graphic concrete is characterized by a high quality of washbasin concrete. As the retarder is manufactured industrially, the slider layer is very homogeneous and the slider is guaranteed to remain on the film.
Achieving a high-quality result requires accuracy and artist's eye
Achieving high-quality graphic concrete plays an extremely important role in the accuracy of the work and compliance with manufacturing technology.
The washing depth of the washbasin depends to a large extent on the chemical reaction between the concrete and the retarder.
Images that can be applied to the facade can be considerably larger than the dimensions of one element, and the image decorating the building can extend over several elements.
Cooperation between the owner of the building, the architect and the manufacturer is fundamentally important.
Often, graphic concrete is used in close proximity to the sites being observed, often forming a significant part of the building's architecture.
The article uses both Graphic Concrete Ltd and E-Betoonelement photo material.
Hämeenlinna County Archives
This is the building that won the 2009 Finnish Concrete Design Award and the Best Concrete Foundation Architecture Award.
The panels were made on the production lines of our Finnish sister company Parma OY. Mikko HeikkineniIt's said that this black "national memory stick" is full of embroidered archival depths from the times of peoples and kings to the signs of today's, Internet era.
Usually the displayed pattern is performed on the laundromat technique and the shape surface remains in the background. This time it was decided to do the opposite. The white symbols on the surface of the concrete are made of a smooth molding surface and the background is a black blanket.
|Birth story of graphic concrete
Ornaments have been part of architecture since the beginning of time. There have been seen Valli-Lember Bogatkina and Margareta Fuksi created pannoses.
Graphic Concrete ™ is an interior designer Samuli Naamanka developed and patented technology designed to decorate prefabricated concrete façades.
Graphic Concrete Ltd, a manufacturer of graphite concrete finishing solutions and a manufacturer of slip resistant materials, has actively involved its customers and partners in the development of this technology.
The collaboration between E-Betoonelement and Graphic Concrete Ltd dates back to 2007 when the first test elements were manufactured at Harku.
| Graphic concrete
The special prize for the architect for the open space “Teeaeg” of Estonian Road Museum went to Maarja Kask, Karli Luik, Ralf Lõoke and Pelle-Sten Viiburg from Salto architectural office, and the special prize for the architect for the idea of graphic concrete went to Malle Jürgenson, Krista Lepland and Tea Tammelaan from Laika, Belka & Strelka design office.
Client: Road Administration of the Southern Region of Estonia, South-East Road Office.
Constructor: Jaan Port.
Builder: KPK Teedeehitus Ltd.
Concrete works: YIT Ehitus Ltd.
Producer of graphic concrete elements: E-Betoonelement Ltd.
Reasons for nomination: This is a unique exhibition environment in the open air that in addition to introducing the history of traffic and roads, offers possibilities for resting and gaining knowledge of traffic education. The road runs in a so-called trench, the exhibition area has been dug lower from the rest of the landscape and it forms a long 8-shaped row. The winding journey makes it possible to present the road and the surrounding space so that there is only one period and one place in sight at a time. Passing through the exposition, there are concrete elements lining the journey, which have been fixed on the retaining wall and decorated with scenery using the technique of graphic concrete. The accuracy and sharpness of the images can be compared to the old, slightly raddled black and white photos or film frames.
Opinion of the jury: In case of the exhibition area that suits perfectly in the landscape, the concrete is not the main performer but only one part of the ensemble. The work of the architect and the interesting solution of graphic design deserve to be singled out the most.
Without doubt, the whole complex has a better effect in summer than in winter when it is snowbound, but it cannot be desired that structures meant for using in summer would be attractive also in winter in Estonian climate.
Graphic concrete could have been used more, and more boldly, in addition to the exposition area also in the leisure area. Instead of PVC-pictures near the entrance and in the traffic village, graphic concrete would have a far more exciting effect but it is clear that the prices of these solutions are very different.
The graphic concrete “photos” are more attractive when looked at from distance, graphic concrete is not very appealing when looking at it close but it seems somewhat dirty and pale. This was probably the aim of the architects – to emphasize the historical value.
In summary, this is still an original object where graphic concrete has been used ingeniously.