RU2598101C1 - Beam with perforated wall - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction, particularly to a perforated beam of the building coatings and floors structures. Beam with a perforated wall comprises two interconnected elements with T-shaped projections made from a rolling profile, walls of which are provided with shaped edges of connectors to make the T-shaped projections and arranged symmetrically relative to longitudinal axes of the profile walls with a half the pitch shift, with the possibility of connection of the obtained elements projections and formation of a chess perforation at connecting them. Edges of the T-shaped projections bases are made convex, and the side edges are straight and inclined relative to the longitudinal axis of the profile wall with the possibility of broadening the projections convex bases. Projections are jointed together by extreme broadened edges of the convex bases, a the perforated holes are formed by the central edge of the base arranged between broadenings of the T-shaped projections and shaped edges of the connector repeating contours of the convex base and the projections side edges.

EFFECT: technical result is improvement of bearing capacity of the beam.

5 cl, 10 dwg

Description

The invention relates to the field of construction and can be used to arrange load-bearing structures of coatings and ceilings of a building.

A beam with a perforated wall is known, made by cutting a profile wall with a regular step along arcuate lines and joining by welding the protrusions of a wall that are joined together (J. Brudka. Light steel structures [Text] / Ya. Brudka, M. Lubinski. Transl. From Polish . - Moscow: Stroyizdat.-1974, p. 321).

The disadvantages of the known beams are: firstly, ineffective technology due to the generation of waste products; secondly, the low bearing capacity of the beam due to the relatively small increase in height with respect to the original profile; thirdly, a decrease in the reliability of the beam due to significant temperature deformations and internal stress concentrations during gas cutting along two arcuate lines located close to each other.

A known beam with staggered perforation of the wall, adopted as a prototype, made of a rolling profile by cutting the wall of the workpiece along a broken line to obtain two elements with tee protrusions, the lower edges of which are parallel to the longitudinal axis of the workpiece, and the joining of the elements along the protrusions, with each line cutting on the sides of the protrusions is outlined in a zigzag line of three elements with the formation of protrusions with broadened heads, while the elements are connected at the most distant inclination nnym faces protrusions (USSR Author's Certificate №1174541 A, priority date 03.30.1984, publication date 08.23.1985, authors: VA Sands et al, RU, prototype.).

The disadvantage of the prototype is the low bearing capacity of the beam due to the presence of zones of significant stress concentrations in the wall near the cutouts.

The objective of the invention is to increase the bearing capacity of the beam by reducing stresses in the wall near the holes.

To solve this problem, a beam with a perforated wall is proposed, containing two elements with T-shaped protrusions connected to each other, made of a rolled profile, the wall of which is provided with curly edges of the connector, forming T-shaped protrusions and made symmetrically with respect to the longitudinal axis of the profile wall with a half step offset, s the ability to connect the protrusions of the resulting elements and education when they connect chess perforation. According to the invention, the edges of the bases of the tee-shaped protrusions are made convex in shape and the side edges are made in a rectilinear shape and are inclined with respect to the longitudinal axis of the profile wall with the possibility of broadening the convex bases of the protrusions, while the protrusions are joined together by the extreme broadened edges of the convex bases, and the perforated holes are formed by the middle the edge of the base, located between the broadening of the T-ridges, and the curly edges of the connector, repeating the contours of the convex base and side edges in Stupa.

According to the invention, the curly edges of the connector forming the extreme edges of the widened convex base of the protrusions are made rectilinear or curved.

According to the invention, I-beams or channels are used as a rolling profile.

According to the invention, the beam is made in the form of a two-wall perforated box-section beam of two perforated I-beams or channels paired along the length of the longitudinal welds.

In FIG. 1 schematically shows a rolling profile with a cut line, a general view; in FIG. 2 - the same side view; FIG. 3 - node A in FIG. one; in FIG. 4 schematically shows a beam with a perforated wall, General view; in FIG. 5 is the same side view; in FIG. 6 - node B in FIG. four; in FIG. 7 is a variant of the shape of the cut line forming the edge of the connector; in FIG. 8 schematically shows a variant of a beam with a perforated wall, general view; in FIG. 9 - node B in FIG. 8; in FIG. 10 shows an embodiment of a box section of a beam.

The inventive beam with a perforated wall consists of two interconnected elements and is made of a rolling profile using well-known techniques: cutting the wall of the workpiece, disconnecting the resulting parts, joining them on the protrusions and welding. The initial beam for the manufacture of a beam with a perforated wall has a rolling profile of height h1 (Fig. 1), which can be used, for example, an I-beam (Fig. 2), having two shelves 1 and a wall 2, or a channel. The wall 2 is equipped with curly edges of the connector, made along the cut line 3, forming T-projections 4, which are made symmetrically relative to the longitudinal axis of the profile wall with an offset of half a step. In this case, the curly edges of the connector formed by the cut line within step 5 (Fig. 3) contain the edges of the bases 5 of the T-ridges and side edges 6. The edges of the bases 5 are made of a convex shape of radius R with broadening, for example, in the form of segments of length a located under angle β with respect to the longitudinal axis of the beam, and the side edges 6 are made in a rectilinear shape in the form of segments of length b, the center of which is located on the longitudinal axis of the original profile, which is the axis of the center of gravity of the profile, and the side edges 6 are inclined with respect to the longitudinal th axis of the profile wall at an angle α to form convex protrusions broadening bases. In the inventive beam with a perforated wall, the protrusions 4 are joined together by extreme broadened edges of the length a of the convex bases 5, and the perforated holes 7 are formed by the middle edge of the base located between the broadening of the T-ridges, and the curly edges of the connector along the cut line 3, repeating the contours of the convex base and side edges of protrusions.

A beam with a perforated wall with a height of h2 (Fig. 4, Fig. 5), obtained after cutting the initial profile, sliding, joining and welding the parts together, has openings 7 more rational in comparison with the prototype form, with a reduced stress concentration near the openings and welds 8 inclined towards the longitudinal axis of the beam (Fig. 6).

To provide an even more significant reduction in the level of stress concentration, a beam with a perforated wall is proposed (Fig. 7 - Fig. 9), made with the edge of the connector along the cut line 3 of the initial profile, containing broadened arcuate radius sections within the hole pitch s (Fig. 7) R, connecting the ends of two lateral edges 6, made in the form of oblique oblique straight line segments of length b, located at an angle α with respect to the longitudinal axis of the beam, the center of which passes along the axis of the center of gravity of the profile.

The reinforced beam with a perforated wall can be made in the form of a two-wall perforated box-section beam of two perforated I-beams or channels paired along the length of the longitudinal welds above and below (Fig. 10).

The technical result achieved by the proposed design is to increase the bearing capacity of a beam with a perforated wall due to a more rational cutting line of the initial rolling profile, which reduces stresses in the wall of the perforated beam near the holes.

Claims (5)

1. A beam with a perforated wall containing two interconnected elements with T-shaped protrusions made of a rolling profile, the wall of which is provided with curly edges of the connector forming T-shaped protrusions and made symmetrically with respect to the longitudinal axis of the profile wall with a half step offset, with the possibility of connecting the protrusions the resulting elements and education when they are connected staggered perforation, characterized in that the edges of the bases of the T-ridges are convex in shape, and the side edges in They are made in a rectilinear shape and inclined with respect to the longitudinal axis of the profile wall with the possibility of broadening of the convex bases of the protrusions, while the protrusions are joined together by the extreme broadened edges of the convex bases, and the perforated holes are formed by the middle edge of the base located between the broadening of the T-ridges and the figured edges of the connector, repeating the contours of the base and the side edges of the protrusions. 2. A beam with a perforated wall according to claim 1, characterized in that the curly edges of the connector forming the extreme edges of the widened convex base of the protrusions are made rectilinear. 3. A beam with a perforated wall according to claim 1, characterized in that the curly edges of the connector forming the extreme edges of the widened convex base of the protrusions are made curved. 4. A beam with a perforated wall according to claim 1, characterized in that I-bars or channels are used as a rolling profile. 5. A beam with a perforated wall according to claim 1, characterized in that the beam is made in the form of a two-wall perforated box-shaped beam of two perforated I-beams or channels paired along the length of the longitudinal welds.

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