FIELD: construction.
SUBSTANCE: invention is described, which consists in technology of making concrete-pipe structures by installation of internal anchors through holes in a metal pipe, equipped with petal couplings, movable part of which has a threaded joint with the anchor, making it possible to open petals at the specified angle during its rotation and subsequent laying of concrete mix.
EFFECT: joint operation of concrete core and metal pipe.
3 cl, 7 dwg
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