EXPANSION SLEEVE Russian patent published in 2014 - IPC F16B13/00 

FIELD: construction.

SUBSTANCE: invention relates to expansion sleeve incorporated into the element of concrete structure. Expansion sleeve used to incorporate into the concrete structure element during casting, comprises tubular cavity intended for installation of anchor element and opening facing outward from the concrete structure element, in this case the sleeve has wedging from outside, providing the appearance of counter force from surrounding concrete applied to the sleeve radially inward when it is incorporated into the concrete structure element and at application of axial load to anchor element, introduced in threaded engagement with the sleeve tubular cavity in the direction of its extraction. The sleeve is made of deformable plastic, which provides application of force to anchor element directed radially inwards and its inner surface, limiting the tubular cavity has grooves arranged longitudinally to the sleeve and forming multiple surfaces spaced from each other in angular direction and performing clip of anchor element in response to the counter force.

EFFECT: increase of reliability of fixation of archer element in the sleeve.

17 cl, 22 dwg