FIELD: construction industry. SUBSTANCE: apparatus has frames, flexible tray with resilient sides and curvature retainer. Frames are movable one with respect to the other. Frame with straight forming part has U-shaped members rigidly connected one with the other. Frame with curved forming part is composed of columns rigidly joined one with the other, and detachable transverse members, which may be secured to columns. EFFECT: simplified and unified construction, increased efficiency. 2 cl, 5 dwg
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