Biplastic beam

FIELD: construction.

SUBSTANCE: biplastic beam consists of the upper and lower flanges, a vertical wavy wall, an adhesive composition and stiffening ribs, installed in bearing sections and places of the application of concentrated loads. The upper and lower flanges are made of carbon fibre channels, the walls of which form the upper and lower edges of the beam, at that the vertical wavy wall made of fibreglass plates is adjacent to inner horizontal surfaces of the upper and lower flanges by longitudinal edges, and glued to the inner vertical surfaces of the upper and lower flanges by ridges, at that the inner space of the channels is filled with the adhesive composition, and stiffening ribs are glued to the vertical wavy wall and to the upper and lower flanges.

EFFECT: increase of the load-bearing capacity of the beam, its torsional stiffness.

4 cl, 6 dwg

 

The invention relates to the field of construction and can be used as a carrier of various buildings and facilities, including those operated under conditions of chemically aggressive environments, as well as in cases where the structures are demanding demagnetise or not sparking.

Closest to the technical essence and the achieved effect to the proposed technical solution is cleanera beam, which is composed of upper and lower belt, vertical wavy wall, the adhesive composition and ribs. The connection of the upper and lower belts, made of boards or bars of rectangular cross section, with vertical wavy wall is made by pressing the latter into a curved grooves in the adhesive compositions, which are selected in the upper and lower zones on the special copy machines (engineering and Design of wood structures: a Handbook / I. M. grin, centuries Fursov, D. M. Babushkin, etc. - Lipetsk.: Publishing house "Integral", 2005, S. 80-82, Fig.6.5). This constructive solution of the beam has a high local stability of the wall, the ability to provide ribs only in the reference section and in the places of application of concentrated loads.

However, it has a low torsional rigidity of the plose the spine bending due to the large height of the wall "in the light" or between the inner faces of the upper and lower zones. In addition, in the manufacture of such beams require special equipment for installation of wedge-shaped grooves in the upper and lower belts and presses a wall in the curved grooves, which significantly complicates the manufacturing technology of the beam.

The technical result to be obtained from use of the invention is to increase the carrying capacity of the beam, its torsional rigidity and the simplification of manufacturing technology.

The problem is solved due to the fact that in bielstrasse beam comprising upper and lower belts, vertical wavy wall, adhesive composition and ribs, put in the reference section and in the places of application of concentrated loads, the upper and lower belts are made of carbon fiber channels, the walls of which form the top and bottom faces of the beam, and a vertical wavy wall of the fiberglass sheet longitudinal edges adjacent to the inner horizontal surfaces of the upper and lower zones, and crests are glued to the inner vertical surfaces of the upper and lower zones, while the internal space of the channel is filled with the adhesive composition, and ribs glued to vertical wavy wall and to the upper and lower zones.

In addition, the task is solved in that a vertical wavy wall on the supports and in the middle of the rollet l or other the most stressed zones may optionally be reinforced flat fiberglass sheets, formed in the bearing zones of the orthogonal directional fiberglass veneer with a ratio amounts to 1:1 and in the middle of the span of the orthogonal directional fiberglass leads with the ratio of their quantities of 10:1 with the direction of the optical fibers in greater numbers along the beam, with a flat fiberglass sheets bonded to the ridges vertical wavy wall and to the upper and lower zones, and the ribs.

Also the top face of the adhesive composition is formed with a tilt angle of 45 in the direction of the mid-height cross-section of the beam and the wall of the channel zones has a different thickness that increases from the poles to the middle of the span, while the outer dimensions of the channels are not changed.

In Fig.1 shows a view of bielstrasse beams from the side; Fig.2 is the longitudinal section 1-1 in Fig.1; Fig.3 is a cross-section 2-2 of Fig.1; Fig.4 is a cross-section 3-3 of Fig.1; Fig.5 is a cross-section 4-4 of Fig.1; Fig.6 is a longitudinal section through the channel of the upper or lower zones.

Bipustulata beam includes an upper 1 and lower 2 belt, made of carbon fiber channels, vertical wavy fiberglass wall 3, which longitudinal edges adjacent to the inner horizontal surfaces of the upper 1 and lower 2 zones and ridges attached to the inside vertically the m surfaces of the upper 1 and lower 2 zones, adhesive composition 4, which fills the inner space of the channels and ribs 5, set in the reference sections and areas of application of concentrated loads and glued to a vertical wavy wall 3 and to the upper 1 and lower 2 zones. Also part of the beam if necessary, includes flat fiberglass sheets gain 6 formed on the supports of the orthogonal directional fiberglass veneer with a ratio amounts to 1:1 and flat fiberglass sheets gain 7 in the middle of the span of the orthogonal directional fiberglass leads with the ratio of their quantities of 10:1 with the direction of the optical fibers in greater numbers along the beam. Flat fiberglass sheets 6 in the support areas and flat fiberglass sheets 7 in the mid-span glued as it crests a vertical wavy wall 3 and to the upper 1 and lower 2 zones, and the ribs 5. The top face of the adhesive composition 4 is expedient to form with a slope angle of 45 in the direction of the mid-height cross-section of the beam, which reduces the free height of the vertical wavy wall and, consequently, to increase torsional stiffness of the beam. The horizontal walls of the channels of the upper 1 and lower 2 zones may have different thickness, increasing from support to Midspan, while their external R is smery not change, this allows ease of manufacture of the beam and to effectively use the material of the upper 1 and lower 2 belts when working beams in bending, for example, with evenly distributed load.

Bielstrasse beam need to be manufactured in the following order.

1. In accordance with the working drawings are made by hot pressing using simple punches and matrices of the constituent elements of the beam - carbon channel for the upper 1 and lower 2 belts, fiberglass vertical wavy wall 3, the ribs 5, flat fiberglass sheets 6 and 7. For use in supporting areas of flat fiberglass sheets 6 are formed from orthogonal directional fiberglass veneer with a ratio amounts to 1:1. For use in the middle of the span of flat fiberglass sheets 7 are formed from fiberglass leads with the ratio of their quantities of 10:1.

2. On the horizontal base of the stack bottom flange 2 of the beam by the wall of the channel down and inserted into the vertical wavy wall 3, the ribs 5 and, if necessary, flat fiberglass sheets 6 and 7, pre-treating them in the interfaces between the adhesive composition 4.

3. Fill the internal cavity of the channel of the lower belt 2, the adhesive composition 4, forming its upper face Soglom tilt 45 in the direction of the mid-height cross-section of the beam.

4. After hardening of the adhesive composition 4 the beam is turned by 180, putting it on pre-released with horizontal base of the upper zone 1 beam wall channel down.

5. Fill the internal cavity of the channel of the upper belt 1, the adhesive composition 4, forming its upper edge with an angle of 45 towards the mid-height cross-section of the beam.

6. Produce cosmetic treatment design.

Bipustulata beam works as follows. Under the action of vertical load is transverse bending of the beam, with the resulting normal stress perceived by the top 1 and bottom 2 belts, made of carbon fiber channels. Due to the fact that the walls of the channel, in which is concentrated the bulk structural material, form the top and bottom faces of the beam farthest zone from the neutral axis of the cross-section of the beam, the carbon fiber is used most effectively in comparison with belts rectangular cross-section provided in the prototype.

If necessary, increase the bearing capacity of the beam in her suit advanced flat glass-fiber sheets 6, formed in the bearing zones of the orthogonal directional fiberglass veneer with a ratio amounts to 1:1 and in the middle of the span from orthogona is Ino aimed fiberglass leads with the ratio of their quantities of 10:1 with the direction of the optical fibers in greater numbers along the beam. This orientation of the glass fiber veneers can effectively use fiberglass sheets 6 for the perception of the shearing stresses in the support areas and fiberglass sheets 7 to the perception of the normal stresses at mid-span considering the fact that the strength of the fibrous material increases with increase in number of fibers directed along the axis of the effort.

The perception of concentrated vertical loads in the beam provide ribs 5, set in the reference sections and application of these concentrated loads. By construction, the ribs 5 similar to the top 1 and bottom 2 belts, which reduces the range of products used for the manufacture of bielstrasse beams.

Solidity mates all elements bielstrasse beams between themselves and bielstrasse beams in General provided an adhesive composition 4, which is applied to the mating surfaces, and fill her internal cavity of the channels of the upper 1 and lower 2 zones. The u-shaped channel allows such technological operation without performing any additional formwork elements with the exception of setting the temporary end caps to prevent leakage of the adhesive composition 4 on the ends of the channels. When filling adhesive HDMI is the 4 in the inner cavity of the channel in its upper face formed with an inclination angle of 45 towards the mid-height cross-section of the beam. This technique allows to reduce the free height of the vertical wavy wall 3 and, consequently, increase its stability and torsional stiffness of the beam as a whole. Simple fill adhesive composition 4 in the inner cavity of the channel allows to exclude from the technological process of manufacturing of the beam the application of specialized equipment wedge-shaped grooves in the upper 1 and lower 2 zones and presses a vertical wavy wall 3 in a curved grooves, which is a necessary operation in the manufacture of a beam equivalent.

The increase in cross-sectional area of the channels of the upper 1 and lower 2 belts from support to Midspan of the beam l corresponding to an increase of efforts that occur in these zones from the action of external loads. In this case, the internal stresses in the upper 1 and lower 2 belts, and flat fiberglass sheets 7 will be distributed more evenly along the length of the beam that provides the most efficient use of the load bearing structural material, which is the fiber channels of the upper 1 and lower 2 belts and fiberglass flat sheets 7 in comparison with a standard channel with constant wall.

Thus, in comparison with the prototype, the claimed bipustulata beam has a greater load carrying capacity, KRU is strong rigidity and is streamlined manufacturing techniques.

1. Bipustulata beam comprising upper and lower zones, vertical wavy wall, adhesive compositions and ribs, put in the reference section and in the places of application of concentrated loads, characterized in that the upper and lower belts are made of carbon fiber channels, the walls of which form the top and bottom faces of the beam, and a vertical wavy wall of the fiberglass sheet longitudinal edges adjacent to the inner horizontal surfaces of the upper and lower zones, and crests are glued to the inner vertical surfaces of the upper and lower zones, the internal space of the channel is filled with the adhesive composition, and ribs glued to vertical wavy wall and to the upper and lower zones.

2. Bipustulata beam under item 1, characterized in that the vertical wavy wall on the supports and Midspan reinforced flat fiberglass sheets, formed on the supports of the orthogonal directional fiberglass veneer with a ratio amounts to 1:1 and in the middle of the span of the orthogonal directional fiberglass leads with the ratio of their quantities of 10:1 with the direction of the optical fibers in greater numbers along the beam, with a flat fiberglass sheets bonded to both the vertical ridges is Oh wavy wall, and to the ribs.

3. Bipustulata beam under item 1, characterized in that the top face of the adhesive composition is formed with a tilt angle of 45 in the direction of the mid-height cross-section of the beam.

4. Bipustulata beam under item 1, characterized in that the wall of the channel zones has a different thickness that increases from the poles to the middle of the span, while the outer dimensions of the channels do not change.



 

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