FIELD: civil engineering. SUBSTANCE: extensible cantilevers are hinged to the support beam and are overlapped, rotary mechanism of the cantilevers is made in the form of eccentric with control lever and rotary pin, that moves in lengthwise slot of V-shaped support beam. Clamping checks are arranged at right angle to extensible cantilevers and made in the form of teeth engaging shaped elements of the concrete form with the extensible cantilevers of the clamping checks forming obtuse angle between one another on the side of the concrete form. EFFECT: high efficiency. 10 cl, 3 dwg
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