Technology & Quality
Glulam Curves
Our products undergo strict quality control in laboratories (ISO, TÜV, PEFC®). Glulam arches are manufactured from high quality European coniferous timber cut into layers and laminated in a powerful hydraulic press to form their final shape.
In the last 25 years we have tested most of the world's leading glue, machinery and tool brands, adding our own patented solutions to create a technologically unique production process - our factory computers will turn the most elaborate shapes into products in just 40 minutes. If you are looking for a bespoke product - we are the best choice there is.
Machinery
Modern machinery and the use of high quality raw materials enables us to produce structural arches with a span of up to 26 m and radius from as little as 30 cm.They are characterized by high strength and best quality in accordance with EN 14080 - GL 24 C standard. During manufacture process we use premium grade timber, which is selected and dried to 18% humidity. It is then sliced into thin laths with thickness ranging from 2.8-45 mm by precise saws (allowing for 1.15 mm waste on 9 mm batten) and producing a glue-optimised surface 88 % yield. Glue spread is also CNC optimised. We shape curves with high frequency hydraulic presses achieving 12 kg/cm2. Planing and drilling is made by 5-axis CNC Shaper and digital centres producing 4000 units/shift.
Pressure treatment
Impregnation of our glulam curves is usually carried out using a specially designed vessel called autoclave. Inside the autoclave, preservatives like fungicides and insecticides are injected under pressure into the wood. Thanks to formation of a vacuum, impregnation salts penetrate the curves much deeper than in the traditional dipping method. During impregnation we use super ecological - latest generation preservatives called Tanalith E® and Osmose®. Just after this process, curves get a greenish color, which in time turns to honey one and finally to silvergrey, what gives invaluable natural but unique outlook of every arch treated.
How is it made?
Modern machinery, patented technological solutions and use of high quality raw material, enables us to produce structural arches with a span of up to 26 m. All our products are characterized by high strength and quality in accordance with EN 14080 - GL 24C standard.
Only premium grade raw material is selected to manufacture our glulam curves. Timber is sliced into thin laths by precise vertical saws. Glueing in class D4 is CNC optimised, we utilize only world leading certified suppliers. To form desired shape of curves, we use high frequency hydraulic presses. Planing and drilling is made by 5 axis CNC shaper and digital centres.
How do we and our customers use our bespoke timber curves
Bridge curves
Bridge construction
This glulam timber bridge construction is based on our laminated Bridge Curves. Using this structure improves the outlook of your garden and provides a bit of luxury. Wooden laminated Bridge is the best solution for the most demanding customers that appreciate a modern style mixed with usability.
We have a wide offer of bespoke curved bridges due to timber arches used, as we can provide many various shapes of them.
Concertina
Concertina, a veritable revolution in timber design, constitutes a brilliant marriage of TCL Glulam Curves and tensile fabric. Whether it’s for a mini concert hall, an outdoor classroom or simply a gazebo, Concertina is always an eye catcher – an outstanding feature that draws attention. It is designed and manufactured by Jagram in collaboration with the UK based company Base Structures. These curved units, made using advanced TCL (thin construction lamellas) technology, come with a 10 year guarantee to withstand even the most severe outdoor conditions, the fabric covering being of the highest European quality and durability.
Concertina can be assembled by our skilled teams within 2 working days.
Skatepark
Oslo Norway
The concept was to build a structure that was both impact-resistant and highly flexible. The glulam curved wood fit in perfectly here. Parameters: The height of the structure almost 6 m, the diameter of the cups up to 9 m, the length of the ramp about 15m. The constructor assumed that wood fibers should not be cut. The challenge was not only to bend the wood on small radii, but also a very narrow strip and a huge number of their layers. The whole construction weighs a few tons. Which is a small part of the mass of similar objects made using traditional methods.
The project was made of Scandinavian spruce wood of a very high quality.
Interested ?
We are passionate about outstanding projects using laminated arches. We know that laminated, arched wooden curves can be used to make more versatile structures, consuming less natural resources, safer in a fire, with a better strength-to-weight ratio than concrete or steel constructions. That's why we spent years working on machine design and manufacturing process that today allows us to create any shape of laminated wood in less than one hour at a very reasonable cost. Talk to us about your most challenging projects - we will probably be able to implement them.