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Loop-Free Tie-Down Node with an Anchor Rod-Dowel for a Hollow-Core Floor Slab of Formwork-Free Shaping

When designing buildings and structures for various
purposes, the specialists should find new decisions for the
possibility of using structures made using the long-line
formwork-free technology, including hollow-core floor slabs,
namely: installation without free lengths of reinforcement, lifting
without the tie-down loops, joint units with other structure
elements, configuration of sections with new geometrical
parameters. As the hollow-core slabs of formwork-free shaping
are produced without tie-down loops, the problems of installation
and transportation of these slabs are discussed. Examples of
tie-down nodes installation in the slabs produced by the
formwork-free shaping technology were considered in the paper,
with the justification of the complexity of their installation in such
slabs and the increased metal consumption. The aim is to reduce
the laboriousness of rigging work and to provide a gripping device
for a hollow-core slab of formwork-free shaping when removing it
from a long-line pallet, storing, loading and installing this slab
during the construction process. A constructive-technological
decision was proposed for a tie-down node installed in the slab
body without the use of a tie-down loop and having only an anchor
rod-dowel through which the tie-down of a slab could be directly
done without the use of traditional tie-down loops. The node was
designed with reduced metal consumption and does not change
the technology of manufacturing hollow-core slabs of
formwork-free shaping. The theoretical basis for calculating the
bearing capacity of the proposed tie-down node, installed in a
hollow-core slab of formwork-free shaping was determined and
summarized. It was revealed that the bearing capacity of the
proposed tie-down node installed in the body of a hollow-core slab,
under the action of lifting loads, depends on the splitting force of
concrete protective layer located above the anchor rod-dowel of
this node (all things being equal). The theoretical data of the study
were validated by full-scale tests of slabs with tie-down nodes
installed in their body, carried out in accordance with the
proposed structural-technological development. The operational
suitability of the proposed tie-down nodes with an anchor
rod-dowel for the hollow-core slabs of formwork-free shaping and
the possibility of their implementation at other enterprises of the
country having production lines for long-line formwork-free
shaping were stated. A tie-down node with an anchor rod-dowel,
proposed to be installed in a hollow-core slab of formwork-free
shaping, can be used in other reinforced concrete structures
produced by the technology of long-line formwork-free shaping. A
patent for a utility model has been received for the development of
a loop-free tie-down node for a hollow-core slab of formwork-free
shaping.