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Open-air Stage in Krimunas, Latvia
An open-air stage constructed from curved glulam beams with plywood roof structure. Glulam arches span up to 13.72 m and are made with changing geometry to obtain the architectural outlines of the structure. The manufacturing challenge was producing massive curved structures with a small, variable radius.
Our services:
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LocationKrimūnas (Latvia)
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Year of construction2017
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DimensionsRidge height: 7.2 m, Building area: 119.7 m
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ClientMunicipality of Dobele county
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ArchitectAnita Zariņa (Latvia)
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DesignRBD in cooperation with Rodentia (ZAZA TIMBER Engineering)
Engineering part of the project
The role of ZAZA TIMBER Engineering (previously: Rodentia) in this project was:
- Structural design development of major structures
- Detail drawings
- Technical drawings for manufacture and assembly.
An open-air stage constructed from curved glulam beams with plywood roof structure. The stage’s load-bearing structures are made up of glulam arches of different radiuses with span up to 13.72 m and reach the height of 7.20 m. Arches are made with changing geometry to obtain the architectural outlines of the structure. The outer radiuses of the foremost arches are 7 meters, while towards the back, the stage narrows to form a curved, free-form surface. The back glulam arches are formed with a free-form curvature.
Bearing in mind the shape of the stage, large wind loads try to lift the structure, so a comprehensive wind brace system and anchorage to the foundations are used.
Production part of the project
ZAZA TIMBER Production (previously: IKTK) manufactured the glulam structures used to build the stage.
The structures were made of spruce and comprise 54 curved and straight glulam parts: arches of varying radiuses, and crossbeams.
The eight roof arches are made of curved blocks of different radiuses, widths and lengths.
The biggest challenge was manufacturing the arches with varying radiuses and small radiuses. As a standard, the smallest radius we produce is 2.5 m, while the smallest arch for this project had a variable radius of 1 m. The arches had a length of between 6 and 21 m.
The arches were fastened using 38 crossbeams with lengths of between 6.1 and 6.8 m.
The total volume was 22 m3. The strength class of the structures is GL24h.
Manufacturing time: 4 weeks.
Construction part of the project
ZAZA TIMBER Construction (previously: Igate Būve) provided a full construction cycle for the stage.
Before assembly, we built strip foundations, concreted the assembly fastenings, laid the concrete base. The existing site foundations were integrated into the construction process, with the stage foundations being built around the existing square.
In our factory we did all the milling, sawing and drilling for the assembly fastenings.
We embedded assembly fastenings (screws, steel connectors, shear keys, ties).
We assembled the glulam structures with steel wind braces for horizontal stability. We used plywood sheets for the finish. For the roof, we used adhesive waterproofing before installing a roof covering.
We treated the parts with Protim wood oil, which protects the structure against UV rays, damp, pathogens, blue stain, mold and insects.
We installed a drainpipe and electricity, and laid landscaping paving.
Construction time: 2 months.
