CS209271B1 - Reinforcement of reinforced concrete,especially bar-like elements - Google Patents

Description

(54) Reinforcement of reinforced concrete, especially bars

The invention relates to reinforcement of reinforced concrete, in particular bars.

Up to now, reinforced concrete beams and dies have been reinforced with bar reinforcement; which is connected to the stirrups in the reinforcement basket by binding wire. This procedure is suitable for individual building constructions where economical beam or beam reinforcement can be performed according to specific needs, but for mass production of prefabricated beams such a procedure is too laborious and less effective.

Also, in the production of reinforcement baskets for especially l-shaped members, the reinforcement is most often formed from individual individual reinforcing bars, some of which are for. the shear forces are provided with bends which are joined together by welding. The disadvantage of this procedure is the high labor intensity and the need for skilled workers, especially for the creation of welds, while the quality of the reinforcement cages is; too influenced by human factors.

| Other prefabricated beams are reinforced! reinforcement, consisting of parts manufactured industrially; of conventional reinforcing nets, from which the necessary shapes are cut out and formed into the final form of the transverse reinforcement, and secondly from the longitudinal reinforcement formed from individual bars. The disadvantage of this • system is the large shear of the reinforcement mesh through the shear and the small assortment of the cross-section of the mesh, which often requires the use of too large a cross-section of the reinforcement elements. The reinforcement meshes have a fixed mesh size so that the transverse reinforcement cannot be adapted to the varying magnitude of shear forces by changing the spacing of the transverse bars.

The beam reinforcement is also composed of unified elements, consisting of pre-fabricated shape ladders from which the reinforcement of a particular beam is assembled. The disadvantage of this solution is the need for a large number of types of molded elements that occupy too much npsta in warehouses. This system can only work for a small number of beams, but is unsuitable for large-scale production plants.

Reinforcement baskets of beams or columns made on semi-automatic production equipment are also known, in which the required longitudinal bars are fed and transverse bars welded to the longitudinal bars by resistance welds are automatically supplied to the longitudinal bars by the automatic device. However, this production equipment is too complicated, costly and failing in operation

The drawbacks of the prior art reinforcements are largely overcome by the reinforcement of the reinforced concrete, in particular bars, according to the invention, which comprises lattice reinforcing elements, which consists in that it consists of at least one U-shaped cross-sectional mesh.

209271!

(the transverse stirrups are welded with their longitudinal reinforcing bars with their central bases and the spacing of the stirrups is variable. According to another preferred embodiment of the reinforcement according to the invention, the free edges of the transverse stirrups are connected to each other in the longitudinal direction by the upper longitudinal bars.

For the reinforcement of continuous beams or beams fixed at the ends into supports, the reinforcement is formed by a U-shaped basic reinforcement spatial network to which they are added in the U-shaped support reinforcement spatial support webs facing the free ends of the yokes. The stirrups distributed at variable distances are interconnected in the longitudinal direction by longitudinal reinforcing bars. According to another particular embodiment, the longitudinal reinforcing bars are basic! spatial meshes and support reinforcement meshes supplemented by a bundle of longitudinal, interconnected reinforcement bars. ,

Spatial reinforcement nets of the beam reinforcement according to the invention are initially produced on a welding machine as planar, each net being manufactured according to a particular design and having the necessary number of longitudinal bars with the necessary cross-sectional area and the required number of transverse stirrups a cross-sectional area to accommodate shear forces. The net thus produced is then bent in its entirety into a spatial shape in which it has a U-shaped cross-section. The net thus formed has the required shape and comprises longitudinal and transverse bars in the required cross-sectional area and position.

The production of such a spatial mesh is very simple, and it is even easier to put the reinforcement basket into the mold, because the entire mesh is simply lowered into place and the operation is completed. If the length i of the beam is greater or the beam is designed for a higher load, a bundle of interconnected longitudinal additional members can be prepared, which is lowered into a mold and placed on the base of the transverse stirrups. The reinforcement of the continuous beams is similarly simple, since only similar spatial reinforcing bars are placed in the support area, but in the inverted position so that their base is up: and the free U-shaped arms of the stirrups face downwards to the basic main reinforcement net.

Network production can be fully automated and improved to say in full the unfavorable influence of human factor I. The meshes are created in full compliance with the static principles, so that reinforcement savings are achieved. As oblique bends are eliminated, the reinforcement basket becomes much clearer and there are no clusters of reinforcement that otherwise make it difficult to process the concrete mixture at some points in the beam. . The rational arrangement of the reinforcement and its fastening, which at the same time form an additional passive anchorage of the reinforcement in concrete, ensures the lowest steel consumption compared to the existing reinforcement systems.

Before being bent, which is carried out just prior to insertion into the mold, the welded individual nets are simply folded and occupy only a very small space in the landfill, and do not interfere with each other when stacked.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE REINFORCED CONCRETE STRUCTURE OF THE INVENTION FIG. 1 is an exploded perspective view of an overhanging beam having an inverted cross-sectional view

T, as shown in cross-section in the right-hand corner, and FIG. 2 is an exploded perspective view of a simple beam with rectangular cross-section.

The reinforcement of a simple simple beam with a rectangular cross-section is made up of only one pre-fabricated element, consisting of a basic spatial mesh 1, which is composed of U-shaped crossbars 5 designed to accommodate transverse forces in the loaded beam and spaced apart their density has been adapted to the magnitude of the shear forces at the respective location of the beam and that the transverse bars 5 absorb all transverse forces and the reinforcement does not have to be supplemented by bends. Longitudinal rods 6 are then connected to the bases of the transverse members 5, which transmit positive bending moment. The basic spatial network 1 is produced in a plane shape by means of an automatic welding device, by means of which the cross bars 5 are connected to the longitudinal bars 6; prior to insertion into the mold, the basic planar mesh is formed into a spatial shape in which it has the shape of a trough inserted into the form of a beam with a rectangular cross-section. If the positive bending moment of the beam is greater, the reinforcement is complemented by a bundle of 2 longitudinal members which are connected to each other by crossbars and placed on the base of the basic spatial net 1 (Fig. 2).

The reinforcement basket for reinforcing a continuous beam or a beam with overhangs also consists of a basic space net 1 consisting of U-shaped cross bars 5 spaced at different distances to accommodate all transverse forces, and longitudinal bars 6 for absorbing positive bending moment welded to the middle Also in this case, the longitudinal members 6 are joined with further longitudinal members connected to each other in a bundle 2, which is placed on the base of the trough base space net 1. To support the negative bending moments above the support, support reinforcing nets 3 are used, which are also formed by transverse bars 5 of shape

Also, in order to absorb the supporting negative moments, the longitudinal bars 6 of the reinforcing spatial nets 3 are complemented by the supporting bundles 4 of the longitudinal bars. If the beam has a T-shaped cross-section (FIG. 1), the arms are reinforced with an additional space 12 of the TJ profile.

Claims (5)

SUBJECT OF THE INVENTION Reinforcement of reinforced concrete bars, in particular, comprising lattice reinforcing elements, characterized in that it consists of at least one U-shaped cross-sectional space (1) whose U-shaped transverse bars (5) are distributed along the length of the space net (1) at different relative distances to accommodate the transverse forces, the transverse bar bases (5) being welded to the longitudinal reinforcing bars (6). Reinforcement according to claim 1, characterized in that the free edges of the U-shaped transverse members (5) are interconnected in the longitudinal direction by the upper longitudinal members. Reinforcement according to claim 1 or 2, characterized in that it consists of a U-shaped base space network (1), the longitudinal bars (6) of which are supported in the drawn part of the cross-section of the bar in particular. (3). consisting of U-shaped transverse members (5) positioned at 180 ° to the transverse members (5) of the basic space net (1), and longitudinal members (6) for capturing negative support bending moments rolled to the transverse members (5) ). Reinforcement according to Claims 1 to 3, characterized in that the longitudinal reinforcing bars (6) of the basic spatial net (1) and, if appropriate, of the supporting reinforcing net (3) are supplemented with bundles (2, 4) of longitudinal additional bars. of the drawn reinforcement. Reinforcement according to one of Claims 1 to 4, characterized in that an additional U-shaped space network (12) is added to the basic spatial network (1) and optionally the supporting reinforcement meshes (3) to reinforce the beam legs or the T-bar section.