RU4314U1 - COMBINED-MONOLITHIC UNINTERRUPTED PLATE COVERING FROM INTEGRATED REINFORCED CONCRETE ELEMENTS (OPTIONS) - Google Patents

Abstract

1. Precast and monolithic continuous ribbed flooring with beam slabs, characterized in that the prefabricated three-layer crossbars with consoles on the side faces and transverse reinforcement outlets from the upper side are freely supported on the foundations using steel box-shaped tables with insulation fixed on the lower side, only the upper bearing layers of prefabricated three-layer slabs with flexible connections are supported on the console of the crossbars, which are connected to the crossbars and to each other laid on the site with monolithic concrete with the horizontal ontal fittings, which fill open horizontal grooves of a rectangular section arranged along the contour of the upper face of the slabs with a width of at least 2 and a depth of at least 1/4 of the thickness of the bearing layer and grooves of a triangular section on its lateral faces - with the formation of a diamond-shaped concrete key between adjacent plates, and also a longitudinal groove with abutment reinforcement along the upper edge of the crossbars. 2. Precast and monolithic multi-span beam-free overlapping with continuous slabs, characterized in that the prefabricated three-layer flat slabs with flexible connections included in it are directly and freely supported on the foundations with the help of the bottom layer of the bearing layer fixed in the corners passing through the heat-insulating and lower enclosing layers of steel box tables with insulation and connecting flat sheets with welded fixing pins, the supporting layers are connected to each other by monolithic concrete laid on the object with size therein gap of the upper horizontal reinforcement, which are filled with horizontal grooves of rectangular and triangular cross-section on the upper side and gras

Description

The authors:

VD Morozensky V, I. Podschubsky G.N. Feldman S.B.Shats

for the issuance of a certificate for a utility model Precast-monolithic continuous continuous-basement non-covering of complex reinforced concrete elements (options).

The utility model is intended for use in the construction of civil and industrial buildings in areas with a cold climate for the installation of a continuous reinforced concrete floor of prefabricated elements with a heat-insulating layer (complex) over the cold underground.

Known constructions of basement ceilings for residential and public buildings from prefabricated reinforced concrete slabs supported on foundation beams, walls or grillages, on top of which a layer of heat-insulating material (expanded clay, foam concrete, mineral wool slabs) is laid under the base of the floor 13.

The disadvantages of such ceilings are low factory availability, busyness and high complexity of the device with limited bearing capacity of the base of the floor.

Also known is the construction of a basement for industrial buildings in the North, consisting of a bearing welded beam cage with steel flooring, directly

that and rigidly fixed on the grillages of pile foundations, and a suspended welded pallet filled with thermal insulation from mineral wool plates. Fabrication of the structure is carried out directly at the construction site 23.

The disadvantages of this design, along with the increased complexity of the device are significant efforts from temperature deformations, low fire resistance, the need to use heat insulation with increased moisture absorption, the presence of numerous cold bridges.

To eliminate these drawbacks, simplify the design, increase its durability and operational reliability while reducing the construction complexity, two variants of a useful model of basement precast-monolithic overlapping are proposed in the form of:

- multi-span continuous ribbed with beam slabs;

- multi-span beamless with continuous flat plates;

The first variant of the utility model includes (figure 1): - prefabricated reinforced concrete crossbars 1 with a layer of insulation on the bottom and consoles on the side faces - for supporting plates; prefabricated reinforced concrete three-layer slabs with flexible ties 2 with an open rectangular groove along the upper edge of a width of at least two thicknesses and a depth of at least 1/4 of the thickness of the upper bearing layer of the plate; cross layers of reinforced monolithic concrete 3, combining prefabricated elements into a continuous ceiling, freely supported on horizontal surfaces of foundations, for example, grillages 4 on a pile base.

The vigorous support of the monolithic overlap on them provides a significant reduction in the additional forces in the structure from thermal deformations.

To ensure the collaboration of prefabricated elements in continuous overlap are provided (figure 2): on the upper edge of the crossbars 1 loopbacks of the transverse mat b with the horizontal reinforcement 7 fixed thereon; the device along the lateral vertical faces of the carrier layer of the plates of a triangular open groove 8 (Fig. 2.6) for the formation of concrete dowels after monolithic, perceiving shear forces.

For the same purpose, grids 9 with transverse working reinforcement are installed in horizontal grooves along the span.

The lower faces of all elements are protected from low temperatures by a continuous layer of effective insulation 10, covered by a freely deformable enclosing reinforced concrete layer 11 on flexible bonds 12 in the plates, and in crossbars, by a freely suspended metal casing 13 or reinforced concrete enclosing layer on flexible connections.

To transfer support reactions without loading the heater, the crossbars are equipped at the ends with boxed tables 14 attached to the embedded parts on the lower edge with a height equal to or greater than the thickness of the insulation layer (Fig. 3, a), the open cavities of which are filled with insulation 10, which eliminates the formation of cold bridges. For the same purpose, all vertical seams between the elements, free from monolithic concrete, are filled with polymer sealant 15.

And a one-sided console for supporting plates along the floor contour; prefabricated reinforced concrete three-layer slabs with flexible connections 2 with an open rectangular groove along the contour of the upper face and a triangular groove along the lateral faces of the bearing layer, equipped at the corners with embedded parts with box-shaped supporting tables attached to them with a height equal to or greater than the total thickness of the insulation and enclosing layers; cross layers of reinforced monolithic concrete 3, combining prefabricated elements into a continuous beam-free floor, freely supported on foundations 4 with connecting flat sheets 16 with welded vertical fixing pins 17. When installing the plates, they are fixed in the design position by passing the pins 17 through the holes on the bottom the edges of the box support table 14 (Fig. 46),

The frameless construction of the ceiling reduces the range of prefabricated elements, reduces the cost of their production and installation.

The presence of connecting sheets ensures the fixation of prefabricated plates before monolithic, and the free support of them through the foundations significantly reduces additional structural forces from temperature deformations.

The joint work of prefabricated elements in continuous bezel-free overlapping is ensured by monolithic concrete in the presence of: loop outlets of transverse reinforcement 6 from the upper edge of the crossbars 1 and support reinforcement 7 (similar to FIG. 2, a); installed in rectangular grooves of plates of horizontal working reinforcement 9 - span and support; concrete diamond-shaped dowels due to the filling of triangular grooves 8 on the side faces of the bearing layers of adjacent plates (see Fig. 2.6). In this case, the lower faces of all elements are protected from low temperatures by a continuous layer of effective insulation 10, covered by an external reinforced concrete layer 11 on flexible connections 12.

In order to simplify the production of three-layer slabs, it is possible to use fiberglass connectors instead of metal flexible ties, including in the form of stud bolts for subsequent fastening of the plates of the insulating layer and suspension of the reinforced concrete slab of the outer layer. It is also possible at the same time to use other flame-retardant materials for the outer layer of plates, for example cement-bonded particleboards.

References:

1. Guide to the construction of permafrost. Leningrad branch of Stroyizdat, 1977 - 551s.

2. Arrangement of the Zapolyarnoye gas and oil condensate field. Industrial base in the village of Tazovsky. Foundations and foundations. Inv. N 18731. Foundation project, Moscow, 1994.

VD, Morozensky V.I. Poddubsky, Feldman, S.B.Shats

Claims (3)

1. Precast and monolithic continuous ribbed flooring with beam slabs, characterized in that the prefabricated three-layer crossbars with consoles on the side faces and transverse reinforcement outlets from the upper side are freely supported on the foundations using steel box-shaped tables with insulation fixed on the lower side, only the upper bearing layers of prefabricated three-layer slabs with flexible connections are supported on the console of the crossbars, which are connected to the crossbars and to each other laid on the site with monolithic concrete with the horizontal ontal fittings, which fill open horizontal grooves of a rectangular section arranged along the contour of the upper face of the slabs with a width of at least 2 and a depth of at least 1/4 of the thickness of the bearing layer and grooves of a triangular section on its lateral faces - with the formation of a diamond-shaped concrete key between adjacent plates, and also a longitudinal groove with abutment reinforcement along the upper edge of the crossbars.  2. Prefabricated monolithic multi-span beam-free overlapping with continuous slabs, characterized in that the prefabricated three-layer flat slabs with flexible connections included in it are directly and freely supported on the foundations with the help of the steel layer fixed in the corners of the lower edge of the bearing layer passing through the heat-insulating and lower enclosing layers of the box tables with a heater and connecting flat sheets with welded fixing pins, the supporting layers are connected to each other by monolithic concrete laid on the site with the horizontal upper reinforcement placed in it, which filled the horizontal grooves of a rectangular and triangular section on the upper and side faces, and formed diamond-shaped concrete dowels.  3. The overlap according to claim 2, characterized in that for three-layer plates, stud bolts are used as flexible connections for subsequent fastening or replacement of the heat-insulating layer and suspension of the outer layer of the reinforced concrete or other fire-resistant materials.