Abstract
Due to the fact that hollow-core slabs without formwork are produced without slinging loops (features of manufacturing technology), the issue of installation and transportation of these slabs has been solved. A constructive and technological solution is proposed for a slinging unit, arranged in the body of the slab, without the use of a slinging loop, and having only an anchor rod-dowel through which it is possible to directly sling the slab without using traditional slinging loops. The unit is designed with a reduced metal consumption and does not change the technology for manufacturing hollow-core slabs without formwork. Found and summed up a theoretical basis for calculating the bearing capacity of the proposed slinging unit, arranged in a hollow-core slab without formwork. It was revealed that the bearing capacity of the proposed slinging assembly, arranged in the body of a hollow-core slab, under the action of assembly loads, depends on the force of splitting the concrete of the protective layer located above the anchor rod-dowel of this assembly (all other things being equal). The theoretical data of the study were verified by full-scale tests of plates with slinging units arranged in their body, carried out in accordance with the proposed constructive and technological development. A utility model patent was obtained for the development of a loopless slinging unit for a hollow-core slab without formwork.
Highlights
The imperfection of hollow-core slabs without formwork - the absence of slinging loops, leading to problems when lifting, installing these slabs, reduces the safety of construction work
In [2, Fig. 2] and [3, Fig. 3], a slinging unit is proposed for a hollow-core slab without formwork with crossshaped loops, the design of which is two reinforcing bars intersecting under the unit 900, located in the middle part along the height of the slab section
The rods of the cruciform loops are inserted along their entire length into the freshly formed body of the striped concrete massif through its lateral face
Summary
The imperfection of hollow-core slabs without formwork - the absence of slinging loops, leading to problems when lifting, installing these slabs, reduces the safety of construction work. When installing and lifting such plates without slinging loops, special load-handling devices are used. The competitiveness of load-gripping devices when installing hollow-core slabs without formwork is low, due to the fact that slinging with a hook and loop is versatile and easy to process. In this regard, with the transition of precast concrete enterprises to the technology of stand-off formwork molding, it became necessary to develop slinging assemblies in the slab body, taking into account their manufacture using this technology. At the intersection of the rods on the upper shelf of the slab (above the void), a groove is formed through which the rods are gripped by the hook of the cargo sling (Fig. 1)
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