RU161917U1 - Butt joint of floor slabs with crossbar of prefabricated reinforced concrete building frame - Google Patents

Abstract

The joint of the floor slabs with the crossbar of the prefabricated reinforced concrete frame of the building, including reinforced concrete crossbars placed at the level of the floor with a smooth ceiling surface, multi-hollow floor slabs with reinforcement in the voids of the end face of the slab and monolithic concrete, characterized in that the multi-hollow floor slabs are made by formless molding transverse reinforcement with oblique ends, connected to the crossbar with two brackets mounted on the crossbar, at the ends of which are placed in voids plates are mounted with the possibility of rotation by 90 ° rotary devices with a surface that repeats the surface of the void of the plate, and passed through longitudinal holes in the upper or lower shelves of the slab into the voids of the plate with the possibility of transferring the load to the crossbar during installation.

Description

The utility model relates to the construction of a precast concrete carcass of a building, namely, to the structures of the joints of precast reinforced concrete multi-hollow floor slabs and crossbars.

In modern civil engineering, monolithic reinforced concrete is widely used. It made it possible to obtain “flexible” space-planning solutions for buildings, including due to the possibility of creating beam-free ceilings with a smooth ceiling surface.

However, monolithic housing construction dramatically increases the construction time of buildings, which in the climatic conditions of most regions of the country leads to the need for work at low temperatures.

Prefabricated housing construction dramatically reduces construction time and improves quality, especially factory-made products.

In prefabricated housing construction, a frame-beam system is used. However, the use of crossbars with overhanging elements in the ceiling system limits the number of space-planning decisions and reduces the comfort of the building's interiors.

Known are the butt joints of floor slabs with a crossbar, when the perception of the mounting load from prefabricated reinforced concrete multi-hollow floor slabs of a building can be carried out by a crossbar with the plates resting on the top of the crossbar or on the crossbars of the crossbar. / Typical series of mass application 1.020-1 / 87 Structures of interspecific application framework for multi-storey public buildings, industrial and auxiliary buildings of industrial enterprises, M, Central Research Institute of Industrial Buildings, 1987 /. Positive in this decision is high structural reliability.

A disadvantage of the known structures is the presence of a protruding lower part of the crossbar, which inhibits the free layout and reduces the comfort of the room.

Known key connection of the plate with the crossbar with the formation in the voids of the plate reinforced dowels, which leads to a heavier overlap and an increase in load in the bearing area. In this solution, the fixing of the plates in the design position is ensured by the installation on the lower floor of the inventory racks of adjustable height, allowing to obtain a single mark of the bottom of the plates and crossbars. / RF patent No. 2453662, cl. E04B 1/20 publ. 06/20/2012 /.

The disadvantage of this solution is the restriction of movement and delayed production of work, in particular on the construction of partitions, on the previous floor, because racks are removed only after the entire installation period (reinforcement, concreting and strength gain with concrete keys).

Closest to the proposed design is the butt joint of a precast-monolithic reinforced concrete frame of the crossbar building with an overlap, including reinforced concrete crossbars placed at the level of the floor, multi-hollow floor slabs supported on the crossbars with reinforcement outlets, rigid elements in the voids of the slabs and monolithic concrete. / RF patent No. 2453662, cl. E04B 1/20 publ. 06/20/2012 ./

The disadvantages of the known design is the need for monolithic concreting of a part of the crossbar, which lengthens the production cycle, as well as the presence of dense reinforcement in each void with the formation of dowels, which makes the structure heavier, increases the load in the supporting zones.

The technical task is to obtain a smooth ceiling surface of the floor in the prefabricated version of the reinforced concrete frame of the building and the possibility of using multi-hollow floor slabs formed by the continuous molding method without transverse reinforcement with trimming the plates at the ends in the supporting zone while maintaining the rigidity and reliability of the joint.

The problem is solved in such a way that in the butt joint of floor slabs with a crossbar of a prefabricated reinforced concrete frame of a building, including reinforced concrete crossbars placed at the level of overlap with a smooth ceiling surface, multi-hollow floor slabs with reinforcement in the voids of the end face of the slab and concrete monolithing, according to the utility model, multi-hollow floor slabs are made by formless molding without transverse reinforcement with oblique ends, connected to the crossbar with two brackets, fixed on the crossbar, at the ends of which the slabs are located in the voids of the slabs, mounted, with the possibility of turning by 90 °, rotary devices with a surface repeating the surface of the slab of the slab, and passed through the longitudinal holes in the upper or lower shelves of the slab into the slots of the slab with the possibility of transmission to the bolt load during installation.

The proposed design of the butt joint differs from the known one in that multi-hollow floor slabs are made by formless molding without transverse reinforcement with oblique ends, connected to the crossbar with two brackets mounted on the crossbar, at the ends of which the plates are hollowed, mounted, with the possibility of rotation by 90 ° , rotary devices with a surface repeating the surface of the void of the plate, and passed through longitudinal holes in the upper or lower shelves of the slab into the voids of the plate with the possibility Nost transmission load bolt during installation.

The proposed inserts provide the transfer of the mounting load from the plates to the crossbar through the rotary devices in the voids of the plates. The length of the liners depends on the proportion of the mounting load transmitted to the lower and upper zones of the channel at the points of support and their bearing capacity during punching.

The technical result is the provision of a rigid junction of the slab-crossbar made of prefabricated reinforced concrete elements, the exclusion of welding and reduction of monolithic work, reducing the complexity of installation work, increasing the reliability of the construction of the precast concrete frame of the building and the possibility of forming a smooth ceiling surface using a hidden precast reinforced concrete crossbar, as well as reducing cost due to the possibility of using multi-hollow floor slabs continuous formless molding without transverse reinforcement.

In FIG. 1, - shows the butt joint of a precast concrete frame of a crossbar building with an overlap; FIG. 2 - BB FIG. one; FIG. 3 - A-A of FIG. one; FIG. 4 - B-B of FIG. 3; FIG. 5 is the same as in FIG. 3, an embodiment of the bracket; FIG. 6 - DG of FIG. 5; FIG. 7 is an arrangement of rotary devices from below.

The butt joint consists of a crossbar 1, a multi-hollow plate 2. In the zone of extreme voids of the plate 2 in the upper 3 or lower 4 shelves, holes are cut into which brackets 5a) or 5b) are inserted, at the ends of which rotary devices 6 with a rotary key 7 are fixed. the voids of the slab 2, reinforcement cages 9 are started and a limiter 8 of monolithic concrete is installed.

After the required strength of concrete has been set, the ends of the continuous molding slabs can be cut obliquely, which facilitates the reinforcement and concreting of the zone between the crossbar 1 and the slab 2.

Then, at the ends of the plate, in two extreme or adjacent voids, longitudinal holes are cut in the top 3 or, as an option, in the bottom 4 shelves of voids.

During the installation of the longitudinal holes, the supporting metal brackets 5a or 5b passing the load to the crossbar 1 are passed through. The rotary devices are mounted on the brackets 6. The rotating device repeats the shape of the top of the void. It is rotated 90 ° with a rotary key 7, perceives the mounting load and fixes the plate in the operating position.

The area between the crossbar and the slab, including the adjacent zone of voids with inserted stops 8, is reinforced with frames 9 and concreted, preferably with monolithic fine-grained concrete on expanding cement.

Reinforcement and concreting provide a design continuous design, similar in work to a monolithic overlap.

Claims (1)

The joint of the floor slabs with the crossbar of the prefabricated reinforced concrete frame of the building, including reinforced concrete crossbars placed at the level of the floor with a smooth ceiling surface, multi-hollow floor slabs with reinforcement in the voids of the end face of the slab and monolithic concrete, characterized in that the multi-hollow floor slabs are made by formless molding transverse reinforcement with oblique ends, connected to the crossbar with two brackets mounted on the crossbar, at the ends of which are placed in voids plates are mounted with the possibility of rotation by 90 °, rotary devices with a surface repeating the surface of the void of the plate, and passed through longitudinal holes in the upper or lower shelves of the slab into the voids of the plate with the possibility of transferring the load to the crossbar during installation.

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