Technical solutions of a prefabricated monolithic building for reinforced concrete plants with limited technological capabilities

Abstract

Introduction. The article discusses the innovative structural system of SPMF (prefabricated monolithic spatial frame) in terms of its practical implementation at enterprises producing precast reinforced concrete structures. In particular, we mean low-capacity plants located in the regions and not having a developed technological base. The introduction of SPMF at these enterprises will allow to organize the production of products for the construction of social and cultural facilities, as well as residential buildings in conventional and seismically active areas. The structural system consists of H-shaped frames arranged orthogonally to each other and interconnected in height by monolithic inserts, and horizontally by ties. The floors are prefabricated from solid reinforced concrete slabs, connected to each other through embedded parts by welding. It is possible to use multi-hollow flooring. Enclosing structures made of small-piece elements or hinged panels on a frame with effective insulation.H-shaped frames are located on a grid of axes of 6 × 3 m or 6 × 6 m – in the case of multi-hollow flooring. The frame is manufactured in a horizontal position. The size of the molds in length does not exceed 3,000 mm, one half-frame is made in the mold. The dimensions of the half-frame are 2,000 × 3,000 mm. The half-frames have rebar outlets in the crossbar part for subsequent enlargement assembly. The consolidation assembly can be carried out at the factory or on the construction site during the installation process. Products are transported in a horizontal position by flatbed trailers.For low-rise buildings, seismic protection is provided using the "sliding foundation" technology.Materials and methods. On the basis of a given architectural and planning solution of a residential 4-storey building located in the Prokopyevsk area, for the concrete plant of LLC Promkombinat in Kaltan, Novokuznetsk region, at the "concept" stage, the layout schemes of frames, floor slabs, as well as the main technical solutions of nodal connections were developed, the calculation of the building was carried out.The range of products for the construction of the aboveground part of the house consists of 10 positions: half-frame – 2 units; floor slabs – 2 units; stiffness diaphragms – 2 units; staircases – 2 units; staircases – 2 units.The foundation for the building is provided from monolithic concrete with an active seismic isolation device in the form of a sliding belt, which is arranged under the pillars of H-shaped frames. A pair of fluoroplast F-4 – steel is considered as a sliding element.Results. A practical example of the implementation of an innovative frame system of SPMF at a specific enterprise is given.Conclusions. During the development work on the adaptation of the SPMF frame system at the precast concrete plant, technical solutions were obtained for a 4-storey residential building located in an area with seismic activity of 8 points. The main load-bearing elements of the H-shaped frame and the ceiling are made in horizontal forms available at the enterprise. The dimensions of the products do not exceed those established for transportation by flatbed vehicles. The introduction of this system at the enterprise makes it possible to establish the production of residential buildings in the region, as well as social and cultural facilities.