RU177839U1 - STEEL-REINFORCED-CONCRETE PRE-STRESSED OVERLAP - Google Patents

Abstract

The utility model relates to the field of construction, namely, structures used as floors and coatings of residential and public buildings. A useful model is aimed at increasing the stiffness, strength of both beams and the floor as a whole due to the rational transfer of prestressing forces to concrete. The result is achieved the fact that in the steel-reinforced concrete floor, including the supporting beams, longitudinal prestressed reinforcing bars, anchor devices and filling elements, united by a monolithic plate, according to useful of the first model, an anchor unit is placed at the end of the supporting beam, connected to tensioners located outside the end of the beam with the possibility of releasing tensioners after transferring the prestressing forces to concrete. due to its work as a ribbed prestressed plate and as a result provides a reduction in the consumption of materials, as well as through the use of filling elements lightweight concrete gives the floor improved sound and heat insulation properties.

Description

The utility model relates to the field of construction and can be used as floors of residential and public buildings.

Known precast-monolithic overlap for construction, comprising a fixed formwork of individual elements with longitudinal recesses, longitudinal and transverse reinforcement and monolithic reinforced concrete slab, where the formwork elements are made in the form of light concrete blocks having transverse channels closed from above, into which transverse reinforcement is passed. [RF patent 2097502, IPC E04B 5/38. 11/27/1997].

The disadvantage of prefabricated steel-reinforced concrete floors is the reduced rigidity and strength of the floor due to the lack of prestressing and the need for temporary inventory scaffolding for installation.

It is known that precast-monolithic overlapping, including reinforced concrete beams with an open reinforcing cage and with precast reinforced concrete hollow box-like elements open from below and having a transverse trough in the middle, interconnected by monolithic concrete (RF Patent No. 537173, publ. 30.11.1976, B No. 44).

The disadvantages of this precast-monolithic overlap are: insufficient rigidity and strength due to the lack of prestressing, the complexity of manufacturing a reinforced concrete beam with a reinforcing frame (first you need to make a frame, then concrete the lower part of the beam section), the complexity of manufacturing a hollow box-like element with holes, the presence of a transverse the grooves in the middle of the long side can cause the box element to break during transport.

The closest is the reinforced concrete floor, including load-bearing beams, filling elements with lateral protrusions for their support on the beam and with protrusions in the perpendicular direction of the beams, with the formation of grooves for placement of transverse reinforcement.

The disadvantages of steel-reinforced concrete flooring is the relatively low stiffness and strength due to the lack of prestressing of the floor in the direction of the load-bearing beam (see RF patent No. 133549, publ. 20.10.2013, bull. No. 29)

The utility model is aimed at increasing the rigidity and strength of the carrier beam and the floor as a whole.

The result is achieved in that in a steel-reinforced concrete floor, including load-bearing beams, longitudinal prestressed reinforcing bars, anchor devices and filling elements, united by a monolithic plate, according to a utility model, an anchor unit of prestressed reinforcement is placed in the end of the load-bearing beam in the form of a steel corner shortener connected to tensioners, located outside the end of the supporting beam with the possibility of removing the tensioners after the transfer of prestressing forces to concrete.

In FIG. 1 shows a steel-reinforced concrete overlap in a perspective view. In FIG. 2 is a perspective view of a tension and anchor device (assembly “B”), FIG. 3 - overlap in the section "aa" after removing the tensioners.

The overlap includes load-bearing beams 1 with anchors 2, light-concrete filling elements 3 with holes made in the direction of the beam are supported on the beams 1. The filling elements 3 are made with lateral protrusions, with which they are supported on the supporting beams 1. An reinforcing mesh and a concrete layer of the slab 4 are laid on the filling elements 1. An anchor device made of steel short steel 6 is placed in the end part of the beam 1, which rests on the wall 5 prestressing reinforcement 7 and tensioners 8, which create stresses relying on the wall 5 through an angular shorty 10 by turning the heads 9 of the tensioners 8. In the angular arm 10 of the wall 5 and arm 6 of the beam 1, holes are drilled, and in the arm 6 ana thread tensioner 8.

The order of installation of the floor is as follows.

In the factory, a beam 1, pre-stressed reinforcement 7, shorts 6 and 10 are made. In shorts, holes are drilled for reinforcement 7, and holes for tensioners 8 are made in the can 10 and holes are made in the can 6 and the threads are cut. The ends of the prestressed reinforcement 7 are inserted into the openings of the shortys 6 and put on the nut.

Bearing beams 1 with anchors 2 are installed on the walls, then filling elements 3 are laid on these beams. Holes are made in wall 5 under tensioners 8. Shorty 10 is put on tensioners 8 through holes, then tensioners are inserted into holes in walls 5 and then into threaded holes shorty 6, turning the head 9 of the tensioner 8 with a torque wrench create prestressing in the reinforcing bars 7 (Fig. 2).

The plate 4 is monolithic, after the concrete has gained the strength, the tensioners 8 are removed (Fig. 3). This embodiment of the prestressing of the longitudinal flexible reinforcement 7 makes it possible to efficiently transfer the prestressing forces to the concrete of the slab 4, rationally using the compressive forces, increasing the rigidity and load-bearing capacity of the beam, the overall overlap and the reliability of the prestressing system.

The assembled prefabricated steel-reinforced concrete prestressed floor due to the creation of prestressing along the supporting beam 1 and compression of the concrete of the slab 4, has increased rigidity and strength, due to its work as a prestressed ribbed slab and, as a result, reduces steel consumption. The use of filling elements made of lightweight concrete gives the floor improved sound and heat insulation properties, eliminating the need for a flat ceiling base.

Claims (1)

Steel-reinforced concrete prestressed flooring, including load-bearing beams, filling elements combined by a monolithic plate, longitudinal prestressed reinforcing bars and anchor devices, characterized in that anchor nodes of prestressed reinforcement are placed at the end of the load-bearing beams, connected to the tension device located outside the end of the load-bearing beam with the possibility removing tensioners after transferring tension forces to concrete.

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