Metal beam

 

(57) Abstract:

Usage: in ceilings and roofs of buildings and structures for various purposes. The inventive metal beam includes a belt, a flat perforated wall, cross-reference and longitudinal reinforcing ribs. The perforated wall is made on the zig-zag strips with the outer contour in the form of a parallelogram, is rigidly attached to the belts, and longitudinal reinforcing ribs made in the form of thin profiled sheets. This profiled sheets cover the perforated wall with two sides along the entire height of the beam and rigidly connected with the wall and with belts. 6 Il.

The invention relates to the construction, in particular to metal beams, a wall of which is supported by the ribs, and can be used as the main structure in the ceilings and roofs of buildings and structures.

Known metal beams of open profile, the wall of which is supported a vertical and horizontal ribs [1]

The disadvantages of this beam high intensity because of the increased wall thickness and a large number of reinforcing ribs gestorgui for the production of welding and cutting constructive details.

The closest technical solution of the invention is a metal beam, consisting of belts, perforated walls and reinforcing ribs [2]

Its disadvantages are the increased intensity due to the large wall thickness (the ratio between the thickness of the belt tnand wall thickness t is equal to 16.5/11) and large energy consumption for cutting the original tee-zag line (metalwork Design: Spec. course. The textbook. manual for schools (Ed. by C. C. Berulava, I. I. Kochina, I. I. Krylov, A. C. Silvestrov. L. stroiizdat, 1990, S. 29 64, Fig. 2.28 2.32).

The aim of the invention is to reduce the metal consumption and energy consumption per production.

This objective is achieved in that the metal beam wall made of zigzag strips with the outer contour in the form of a parallelogram, is rigidly attached to the belts, and longitudinal reinforcing ribs made in the form of thin profiled sheets covering the perforated wall with two sides along the entire height of the beam and rigidly connected with its wall and belts.

In Fig. 1 shows a beam in axonometric projection with belts of the Tauri, with the zigzag performtowin the data thin sheets; in Fig. 2 section A-A in Fig. 1; Fig. option 3 beams with belts of the pipe; Fig. 4 option beams with belts of channels; Fig. 5 a detail of the fastening of profiled sheets to the elements of the perforated wall and the belts of the Tauri rivets or spot welding, and Fig. 6 cutting steel strip standard sizes for elements of the perforated wall.

Metal beam consists of zones 1, attached to the welding of elements of the perforated wall 2, a longitudinal reinforcing ribs 3 made in the form of thin profiled sheets, reference transverse ribs 4, 5 links, connecting the corrugated sheets 3 with the elements of the perforated wall 2 and zones 1 and made in the form of rivets, spot welding, etc.

The beam is collected in the following order.

Placed parallel to each other belts, between which is placed a flat perforated wall so that they form a triangular lattice and its beveled edges joined the zones. Then are welded to each other. It must be ensured strict focus bonded elements, i.e., the axis passing through the centers of gravity of cross-sections of the belts and the axis adjacent devout welded on the frame beams profiled sheet first with one hand and attach it to the frame elektroskripke, combined rivets or some other way. Percentual beam, it rightout, carry out the welding of the support ribs, the wall elements and zones on the opposite side, placed second profiled sheet and attach it above. In the case of use as a belt profiles Tauri section welding of elements of the wall and belts can be made with one hand with more welding of the root pass.

Metal beam of this construction operates as follows.

Under the action of vertical load frame beams starts to work as a farm with a triangular lattice, as the ratio of the beam height h to its span l is within 1/110 1/14. If the bearing runs will be performed over the points of intersection of the axial lines of the zones and wall elements, the appearance of the bending moments in the zones is only possible at the expense of display frame effect. When newslove transfer the vertical load of the upper belt will be extra work for local bending. Thus, the upper zone of the beam experience a longitudinally-transverse bending, and the lower belt tension with bending. The elements of the wall, forming a triangular lattice, feel, and tension and compression. RA is locoste impossible because of their loss of stability. Role relations that hold compressed elements from warping, perform hard to bend out of plane beams, corrugated sheets. When connecting stretched elements walls keep profiled sheets from moving out of plane beams and therefore can serve as an elastic retaining the supports for the flooring. Thus, profiled sheets in the composition of the beams are bending from its plane in multispan scheme with an estimated flight (h-height of the beam). Additionally profiled sheets can absorb the shearing forces, thereby unloading perforated wall beams. Welded seams, fastening elements wall with belts, should be sufficient for the perception of differences effort in adjacent panels.

The proposed design of the metal beams with a span of 12 m with linear load 50 kN/m in comparison with the thin-walled beam, reinforced by transverse ribs, saves steel to 9% and a reduction of welding up to 50% of the same beam in comparison with the beam with a wavy wall gives the reduction of welding up to 50% savings in steel up to 1.5%

Metal beam that includes a belt, a flat perforated wall, cross-reference and longitudinal reinforcing ribs gestede parallelogram, rigidly attached to the belts, and longitudinal reinforcing ribs made in the form of thin profiled sheets covering the perforated wall with two sides along the entire height of the beam and rigidly connected with the wall and with belts.

 

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