Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
  • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
  • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
  • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
  • E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
  • E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
  • E04B5/40—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element with metal form-slabs
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
  • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
  • E04C2/32—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material
  • E04C2/322—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material with parallel corrugations

Definitions

• the object of the invention is a corrugated composite slab profile made of metal plate for a concrete floor, in which the corrugations have a trapezoidal form in cross-section and the profile of which includes longitudinal folds running vertically from the level of the profile plate and bent from the same metal plate, the walls of which folds are right next to one another and in which there are adhesion dents.
• the invention is also concerned with a method of manufacturing the composite slab profile.
• Composite slab profiles of this kind are used in place of timber shuttering when casting concrete floors. When the concrete hardens the profile becomes anchored in it and remains permanently in place.
• Several advantages are achieved by using composite slab profiles. Considerably less support is required beneath than when using timber shuttering.
• the composite slab profile itself acts advantageously as lower reinforcement, on account of which the thickness of the slab can be reduced. Adhesion dents are made in the composite slab profile for the tensile stresses appearing at the level of the slab. These are of many different kinds.
• the outwards bulging area is essentially reduced and on the other hand part of the profile still adheres to the concrete, even after bulging.
• the folds located in accordance with the invention also act to increase stiffness and adhesion in deep profiles. It is important for the adhesion members used to provide 100% adhesion, because otherwise the plate separates completely from the concrete and there is no benefit from the whole profile plate. The longitudinal movement must not be between the profile and the concrete, if it is desired to load the profile plate to the upper limit.
• Figure 1 shows the profile in perspective
• Figure 2 shows the composite construction in cross-section
• Figure 3 shows another, pre-cast composite slab profile
• Figure 4 shows the final stage of the profile being formed by rolling.
• the composite slab profile 1 is the same as that shown in the above-mentioned patent publications.
• the profile 1 includes a trapezoidal corrugation, which consists of channel parts 11 rising from the base flange and an upper flange 12. Suitable grips 3, 4 are formed in the channel parts to bind the concrete to the profile.
• a similar adhesion solution to that shown in patent publication 57295 is used, as it is the only solution known to achieve 100% adhesion.
• the adhesion folds 3 are formed, however, in the middle of the channel parts 11, or more precisely at a height of 6/10 of the depth of the whole profile.
• the adhesion folds 3 include depres ⁇ sions or dents at regular intervals, at which the walls of the folds 3 come together. This joint solution gives a 100% adhesion between the concrete and metal plate.
• the folds can also be located slightly higher than this, because quite recently it has been noticed that the steel plate is nevertheless able to carry the tensile load despite highly located adhesion folds.
• the reference number 2 is used for the profile troughs in Figure 2, while the cast mass is marked by reference number 5.
• the fold 3 is formed in the profile, the ridge of it being pressed at regular intervals, which creates the adhesion dents 4.
• the composite slab profiles are set on supports at the ends and next to one another in such a way that the counter-surfaces at the edges join.
• These counter-surfaces include vertical parts 6 and 7, in which other adhesion dents 8 are formed. These are formed by first forming holes 9 in the vertical parts 6 and 7 and pressing the plate inwards from around this, when a hemispherical depression is formed. When placed opposite one another two depressions of this kind form a spherical hole, which fills with concrete during casting.
• a composite slab of this type which is formed of a combination of a profile and concrete, is stressed, the adhesion at the edges of the profile operate up to the ultimate strength of the metal. In these too the metal is not able to escape, instead the tensile stress is transferred in its entirety to the profile.
• In separate elements covered pins can be placed into the cast concrete from the holes, in order to improve the adhesion of the profile.
• the depth of the edges of the profile is 220 mm, and the height of the trapezoidal waves is 180 mm.
• the intention is to cast a slab 250 mm thick.
• the span between supports can be as much as 6 - 10 m.
• the thickness of the plate is 1,5 - 10 mm.
• the other adhesion dents 8 can also be benefitted from in such a way that an adhesion pin, which extends inside the composite slab, can be placed through them. The edge is then stiffened and resists fracturing forces.
• Figure 2 shows the behaviour in a fire of a composite slab profile in accordance with the invention.
• the curve of the bulged profile plate is marked in the Figure by the reference number 9.
• a corresponding bulge curve in a composite slab profile in accordance with the aforementioned Patent 57295 is marked by the reference number 10.
• Several other known composite slab profiles separate completely from the concrete due to the effect of steam pressures.
• the bulging section diminishes considerably and the change in the neutral axis during bulging is only one-third of the previous change. In addition to this the bulging takes place later and the entire composite construction retains its load-bearing capability otherwise longer.
• the folds 3 in the channel sections 11 is most advantageously located at a height of 5/10...7/10, calculated from the depth of the entire profile (the trapezoidal section) .
• the tensile stresses are then able to transfer to the steel profile plate, which becomes fully loaded.
• the forming of the profile by rolling becomes possible, once a simple manufacturing method has been found.
• the casting of the composite slab profile can be carried out in three different ways, one of which is normal in-situ casting, when the profile requires supports during the work.
• a second possibility is to cast a profile equipped with edges already at the factory, except for the joint section of the edges, when its stiffness and strength suffice to carry all stresses during construction, thus making support during construction totally unnecessary.
• factory conditions Excess moisture is able to evaporate freely from a cassette slab element cast in this way under factory conditions, so that the floor surfaces do not suffer as often happens at present.
• the variation in the curvature of the slabs is also small, in which case the thickness of the screed is also small.
• FIG. 3 The form of application in accordance with Figure 3 is a third possibility, in which the composite slab profile is partially cast in the factory.
• the same reference numbers are used for components corresponding to those in the previous figures, i.e. the profile 1, adhesion fold 3, channel section 11, and upper flange 12.
• additional adhesion members 13 are formed in the upper flange 12, these being of any type at all.
• the cast component 14 fills the channels of profile 1 to above the folds 3. In this way an element that will withstand loads during construction is created, in which the casting on top adheres to the additional adhesion members 13 of the upper flanges 12.
• the composite slab profile is most advantageously manufactured in two separate cold rolling stages. First of all blanks of a predetermined size are rolled, these having only the adhesion folds with dents formed in them.
• the rolling line required is quite short, perhaps only a few metres long. After this the blanks of a predetermined size are fed into a line that rolls the real trapezoid profile, which rolls the bends in the profile, with the folds remaining in the free space between the rollers.
• both lines can be placed one after the other, if for example the production run is large.
• Figure 4 shows the rolling formation of profile 1 as an example.
• the cold-rolling wheels 15 and 16 are the width of the flanges. It can easily be seen from the figure that a fold 3 that is located at a sufficient height fits between the rollers.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Building Environments (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8530451

Family Applications (1)

Country Status (3)

Cited By (3)

Citations (4)

• 1990
  • 1990-05-17 FI FI902441A patent/FI902441A/fi not_active Application Discontinuation
• 1991
  • 1991-05-17 AU AU78758/91A patent/AU7875891A/en not_active Abandoned
  • 1991-05-17 WO PCT/FI1991/000156 patent/WO1991018158A1/en unknown

Patent Citations (4)

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