FIELD: construction.
SUBSTANCE: device to form tightening joints in concrete structures comprises a vertical wall, the upper part of which will be installed below the line of surface cracking of the tightening joint; two identical prismatic surfaces, lower parts of which are located alternately on different sides relative to the specified vertical wall and have configuration providing for formation of inlet and outlet sections for closure of adjacent boards and forming support surfaces on one board above the other at the angle to the horizontal plane that is more than 0 and less than 10°.
EFFECT: improved design.
4 cl, 5 dwg
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