EP0870883A2 - Prefabricated joist for floors and/or lintels made of a framework and brick, and brick base for said joist - Google Patents

Prefabricated joist for floors and/or lintels made of a framework and brick, and brick base for said joist Download PDF

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Publication number
EP0870883A2
EP0870883A2 EP98106305A EP98106305A EP0870883A2 EP 0870883 A2 EP0870883 A2 EP 0870883A2 EP 98106305 A EP98106305 A EP 98106305A EP 98106305 A EP98106305 A EP 98106305A EP 0870883 A2 EP0870883 A2 EP 0870883A2
Authority
EP
European Patent Office
Prior art keywords
brick
brick base
joist
base
bolt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98106305A
Other languages
German (de)
French (fr)
Other versions
EP0870883A3 (en
Inventor
Mario Zarantonello
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gruppo Effe 2 SpA
Original Assignee
Gruppo Effe 2 SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gruppo Effe 2 SpA filed Critical Gruppo Effe 2 SpA
Publication of EP0870883A2 publication Critical patent/EP0870883A2/en
Publication of EP0870883A3 publication Critical patent/EP0870883A3/en
Withdrawn legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/065Light-weight girders, e.g. with precast parts
    • E04C5/0653Light-weight girders, e.g. with precast parts with precast parts
    • E04C5/0656Light-weight girders, e.g. with precast parts with precast parts with lost formwork
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C2003/023Lintels

Definitions

  • the invention concerns a prefabricated floor joist made of a framework and brick, constructed so that one or more additional iron bars, in addition to the framework, can be positioned at a given distance from the bottom of the brick base that makes up the joist, said distance being sufficient for the iron bar itself to be covered all around by a concrete layer.
  • the regulations in force regarding the construction of floors require, among the other things, that the metal reinforcement belonging to the floor be structured so that any metal surface must be surrounded in any direction by a layer of cement mortar whose minimum thickness must be 5 mm. This is required in order to ensure maximum cohesion between cement and iron structure and also to prevent the iron from deteriorating over time due to the direct contact with the brick or the atmosphere.
  • one of the methods presently adopted includes the vibration of the cement before its hardening, so that owing to the vibrations the cement mortar can penetrate among the additional iron bars and the bottom of the brick base, thus ensuring a minimum distance between said additional iron bars and said brick base.
  • the raising of the additional iron bars with respect to the bottom of the brick base is obtained by means of projections carried out during the molding of the brick bases that make up the joist. These projections are situated on the bottom at regular intervals and are obtained through a sort of impression made on the bottom of the brick base by raising the brick with respect to the bottom itself.
  • the present invention is aimed at eliminating the above mentioned drawbacks.
  • the goal of the invention is the implementation of a prefabricated joist in which the additional iron bars provided to reinforce the structure of the metal framework are spaced from the bottom of the brick bases.
  • the additional iron bars provided to reinforce the structure of the metal framework are spaced from the bottom of the brick bases.
  • a prefabricated brick joist for floors or lintels that, according to the main claim, comprises a plurality of substantially U-shaped brick bases defining a channel in which the iron bars belonging to the framework or additional iron bars are positioned and which is to be filled with concrete, said joist being characterized in that it comprises a plurality of U-bolts having their ends buried in the brick base and being spaced at regular intervals and aligned with one another in such a way as to define at least one rectilinear support for at least one additional iron bar spaced from the bottom of said brick base, said iron bar remaining within the outline defined by the brick base channel filled with concrete.
  • each U-bolt is made of a wire positioned in the brick before this is baked.
  • Metal straps or other similar materials can be used instead of wire, provided that they are compatible with concrete.
  • Each brick base is preferably, but not necessarily, provided with an U-bolt aligned with other U-bolts belonging to other brick bases.
  • the joist can even make use of only some of the brick bases with U-bolt belonging to the invention, but not necessarily of all of them.
  • the important feature is that the support offered by the U-bolts must be such as to guarantee that every single point of the additional iron bar is spaced from the brick base bottom.
  • the joist indicated as a whole by 1, is provided with a plurality of substantially U-shaped brick bases 2 suitable for defining a channel 3 inside which the base of a framework indicated by 4 is to be placed, whose base iron bars 41 and 42 rest on the concave sides 21 and 22 present in the brick bases 2.
  • a U-bolt 5 with two sides 51 and 52 and a concave part 53 is introduced at a predetermined distance from one of the two ends of the brick base.
  • the ends 51 and 52 are buried in the bottom 23 of the brick base 2 for a length sufficient to fix said U-bolt 5 when the brick is still malleable, because it has not been baked yet.
  • the U-bolt 5 will be definitively fixed in the brick base 2.
  • the burying of the U-bolt 5 is carried out in such a way as to guarantee that, as shown in Figure 3, the distance of the base 53 of the U-bolt from the bottom 23 is at least 5 mm, as prescribed by the regulations in force.
  • the brick base 20, shown also in Figure 5 is provided with two equally spaced U-bolts 5, as shown in Figure 4, which constitute two distinct rectilinear supports for the two additional iron bars 7 and 8.
  • the U-bolts are preferably constructed with the surface 53 slightly concave, in such a way as to guarantee that the additional iron bars will be held in the correct position during the concrete casting.
  • the U-bolts 5 are made of a metal strap and are placed in the brick before its baking by means of a machine resembling a seamer.
  • the U-bolts can also be made of wire or other material, provided that any material used is compatible with concrete and with the prefabricated item.
  • Figure 7 shows a section of a type of brick base 30 used for the construction of door and window lintels.
  • the brick base is filled with concrete after the introduction of the iron bars 9 that must also be spaced from the bottom 31 of the brick base. Therefore, even in this case the required distance between the iron bars and the brick base bottom is guaranteed.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Floor Finish (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The invention concerns a prefabricated joist for floors or lintels (1; 10), comprising a plurality of substantially U-shaped brick bases (2; 20) that define a channel (3) in which iron bars belonging to a framework or additional iron bars are positioned and which is to be filled with concrete. Said joist is provided with a plurality of U-bolts (5), each one having its ends (51, 52) buried in the bottom (23) of said brick base, said U-bolts being spaced at regular intervals and aligned with one another in such a way as to define at least one rectilinear support for at least one additional iron bar (5, 6, 7) spaced from the bottom surface (23) of said brick base, said iron bar remaining inside the outline defined by the channel of the brick bases filled with concrete.

Description

The invention concerns a prefabricated floor joist made of a framework and brick, constructed so that one or more additional iron bars, in addition to the framework, can be positioned at a given distance from the bottom of the brick base that makes up the joist, said distance being sufficient for the iron bar itself to be covered all around by a concrete layer.
It is known that the regulations in force regarding the construction of floors require, among the other things, that the metal reinforcement belonging to the floor be structured so that any metal surface must be surrounded in any direction by a layer of cement mortar whose minimum thickness must be 5 mm. This is required in order to ensure maximum cohesion between cement and iron structure and also to prevent the iron from deteriorating over time due to the direct contact with the brick or the atmosphere.
In order to comply with the regulations in force concerning the construction of prefabricated joists with frameworks and brick bases, one of the methods presently adopted includes the vibration of the cement before its hardening, so that owing to the vibrations the cement mortar can penetrate among the additional iron bars and the bottom of the brick base, thus ensuring a minimum distance between said additional iron bars and said brick base.
Regarding this method, first of all it can be observed that it is rather expensive and at the same time does not guarantee the spacing prescribed by law between the additional iron bar and the bottom of the brick base.
According to the Italian patent application n. BS95O000053, the raising of the additional iron bars with respect to the bottom of the brick base is obtained by means of projections carried out during the molding of the brick bases that make up the joist. These projections are situated on the bottom at regular intervals and are obtained through a sort of impression made on the bottom of the brick base by raising the brick with respect to the bottom itself.
The opinion according to which this type of solution does not ensure compliance with the law is well-founded, since in correspondence with the projections the additional iron bar rests directly on the brick and therefore in these points the structure does not comply with the law. Considering that a beam is provided with a plurality of these supports, there are several points in which the structure does not comply with the law.
The present invention is aimed at eliminating the above mentioned drawbacks.
The goal of the invention is the implementation of a prefabricated joist in which the additional iron bars provided to reinforce the structure of the metal framework are spaced from the bottom of the brick bases. In particular, there must not be any contact between the brick and any part of the additional iron bars and the additional iron bars must be enveloped by concrete as prescribed by law.
The goals mentioned above and other goals that will be better highlighted below have been achieved through the implementation of a prefabricated brick joist for floors or lintels that, according to the main claim, comprises a plurality of substantially U-shaped brick bases defining a channel in which the iron bars belonging to the framework or additional iron bars are positioned and which is to be filled with concrete, said joist being characterized in that it comprises a plurality of U-bolts having their ends buried in the brick base and being spaced at regular intervals and aligned with one another in such a way as to define at least one rectilinear support for at least one additional iron bar spaced from the bottom of said brick base, said iron bar remaining within the outline defined by the brick base channel filled with concrete.
According to a particular application of the invention, each U-bolt is made of a wire positioned in the brick before this is baked. Metal straps or other similar materials can be used instead of wire, provided that they are compatible with concrete.
Each brick base is preferably, but not necessarily, provided with an U-bolt aligned with other U-bolts belonging to other brick bases. The joist can even make use of only some of the brick bases with U-bolt belonging to the invention, but not necessarily of all of them. The important feature is that the support offered by the U-bolts must be such as to guarantee that every single point of the additional iron bar is spaced from the brick base bottom.
Further characteristics and details of the invention will be better highlighted in the description of two favourite applications among many of the invention in question, illustrated in the attached drawings, wherein:
  • Fig. 1 is a partial perspective view of the joist object of the invention in question;
  • Fig. 2 shows the brick base used to make the joist object of the invention before the insertion of the U-bolt;
  • Fig. 3 shows a section of the joist of Figure 1;
  • Fig. 4 is a variant of the joist of Figure 1, in which two additional iron bars for the framework and therefore two rectilinear supports for said additional iron bars are provided;
  • Fig. 5 shows the installation of two U-bolts for each support of the additional iron bars;
  • Fig. 6 shows a section of the joist of Figure 4;
  • Fig. 7 shows a section of an example of brick base suitable for the construction of lintels according to the invention in question.
With reference to the figures described above, it can be observed that the joist, indicated as a whole by 1, is provided with a plurality of substantially U-shaped brick bases 2 suitable for defining a channel 3 inside which the base of a framework indicated by 4 is to be placed, whose base iron bars 41 and 42 rest on the concave sides 21 and 22 present in the brick bases 2. During the molding of the brick base 2 and before its baking, a U-bolt 5 with two sides 51 and 52 and a concave part 53 is introduced at a predetermined distance from one of the two ends of the brick base. The ends 51 and 52 are buried in the bottom 23 of the brick base 2 for a length sufficient to fix said U-bolt 5 when the brick is still malleable, because it has not been baked yet. It can be easily understood that after the baking of the brick the U-bolt 5 will be definitively fixed in the brick base 2. The burying of the U-bolt 5 is carried out in such a way as to guarantee that, as shown in Figure 3, the distance of the base 53 of the U-bolt from the bottom 23 is at least 5 mm, as prescribed by the regulations in force.
It is evident that in this way, when the additional iron bar 6 is placed on the rectilinear support defined by the series of aligned U-bolts 5, the distance of each U-bolt 5 from the bottom 23 will be such as to guarantee that the concrete with which the brick base 2 is filled surrounds the iron bar 6 completely, thus ensuring compliance with the building construction regulations in force.
The same thing occurs when, instead of one additional iron bar, the construction of the joist requires two additional iron bars 7 and 8, as shown in Figure 4. In this case the brick base 20, shown also in Figure 5, is provided with two equally spaced U-bolts 5, as shown in Figure 4, which constitute two distinct rectilinear supports for the two additional iron bars 7 and 8. As it can be observed in the figures described above, the U-bolts are preferably constructed with the surface 53 slightly concave, in such a way as to guarantee that the additional iron bars will be held in the correct position during the concrete casting.
According to a favourite application of the invention in question, the U-bolts 5 are made of a metal strap and are placed in the brick before its baking by means of a machine resembling a seamer.
Beside being made of metal straps, the U-bolts can also be made of wire or other material, provided that any material used is compatible with concrete and with the prefabricated item.
Figure 7 shows a section of a type of brick base 30 used for the construction of door and window lintels. The brick base is filled with concrete after the introduction of the iron bars 9 that must also be spaced from the bottom 31 of the brick base. Therefore, even in this case the required distance between the iron bars and the brick base bottom is guaranteed.
It is clear that the solution object of the invention complies with all the requisites prescribed by law. In fact, the iron bars rest on the U-bolts and therefore the contact takes place between two iron surfaces, and concrete envelops the entire additional iron bar, thus ensuring the necessary distance between iron bar and brick, as prescribed by law.

Claims (8)

  1. Prefabricated brick joist for floors or lintels (1; 10), comprising a plurality of substantially U-shaped brick bases (2; 20) that define a channel (3) in which the iron bars belonging to a framework (4) or additional iron bars are positioned and which is to be filled with concrete, characterized in that it comprises a plurality of U-bolts (5) having their ends (51, 52) buried in the bottom (23) of said brick base and being spaced at regular intervals and aligned with one another in such a way as to define at least one rectilinear support for at least one additional iron bar (5, 6, 7) spaced from the bottom (23) of said brick base, said iron bar remaining within the outline defined by the brick base channel filled with concrete.
  2. Joist according to claim 1), characterized in that the distance between the support surface of said U-bolt and the bottom of said brick base is at least 5 mm.
  3. Joist according to claim 1) or 2), characterized in that said U-bolts constitute two rectilinear supports for two additional iron bars.
  4. Brick base (2; 20) for joist according to claim 1), 2) or 3), characterized in that each U-bolt (5) is fixed to said brick base through the partial burying of its ends (51, 52) in the bottom (23) of the brick base before the baking of said brick base (2; 20), so deep as to ensure the spacing of the brick base bottom from the part of said U-bolt supporting the iron bar.
  5. Brick base (30) according to claim 4), suitable for the construction of door or window lintels, characterized in that it is provided with two or more U-bolts (5) buried in the bottom (31) of said brick base, said U-bolts being arranged in such a way as to constitute, together with other brick bases, two or more rectilinear supports for iron bars to be buried into the concrete cast in said brick base.
  6. Brick base according to claim 4) or 5), characterized in that the part (53) of each U-bolt (5) on which the additional iron bar rests is concave, in such a way as to facilitate the positioning of said additional iron bar.
  7. Brick base according to claim 5) or 6), characterized in that each U-bolt is made of a metal strap.
  8. Brick base according to claim 5) or 6), characterized in that each U-bolt is made of wire.
EP98106305A 1997-04-11 1998-04-07 Prefabricated joist for floors and/or lintels made of a framework and brick, and brick base for said joist Withdrawn EP0870883A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97VI000056A IT1292977B1 (en) 1997-04-11 1997-04-11 BEAM FOR PREFABRICATED SLABS AND/OR LINTELS WITH TRUSS AND BRICK AND BASE FOR THIS BEAM.
ITVI970056 1997-04-11

Publications (2)

Publication Number Publication Date
EP0870883A2 true EP0870883A2 (en) 1998-10-14
EP0870883A3 EP0870883A3 (en) 1999-11-24

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EP98106305A Withdrawn EP0870883A3 (en) 1997-04-11 1998-04-07 Prefabricated joist for floors and/or lintels made of a framework and brick, and brick base for said joist

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EP (1) EP0870883A3 (en)
HR (1) HRP980200A2 (en)
IT (1) IT1292977B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1445391A2 (en) * 2003-02-03 2004-08-11 Coperlegno S.R.L. Prefabricated components for making floor slabs, floors and walls with exposed wood beams
WO2009010366A1 (en) * 2007-07-19 2009-01-22 Leone, Lucio Improved girders for reinforcing concrete and method for connecting them to pillars in order to provide continuity from bay to bay
US7784235B2 (en) 2004-05-11 2010-08-31 Plastedil S.A. Load bearing construction element, in particular for manufacturing building floors, and floor structure incorporating such element
FR2956139A1 (en) * 2010-02-08 2011-08-12 Gerard Sekrane Formwork element for construction of self-supporting girder to construct building, has section receiving units to partially drown metal reinforcement and made of composite material to ensure resistance against fire of self-supporting girder
ITVI20100246A1 (en) * 2010-09-10 2012-03-11 Ugo Zanrosso BASE IN LATERIZIA FOR THE PREPARATION OF PREFABRICATED BEAMS WITH ELECTRO-WELDED TRALICCIA AND LONGITUDINAL ARMOR
FR3023312A1 (en) * 2014-07-07 2016-01-08 Isoltop POUTRELLE FOR MAKING A FLOOR

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2017101A1 (en) * 1970-04-10 1971-10-21 Oltmanns, Heinrich, 2901 Jeddeloh Spacers for reinforcement bars in beam shells, in particular concrete beam shells for lintels
DE2404281A1 (en) * 1974-01-30 1975-08-07 Hermann Dr Datz Light steel lattice girder concrete-sheathed lower chords - connectable by cross arms of clamps joined to stressable supplementary bars
IT8261999V0 (en) * 1982-10-06 1982-10-06 Spil Impianti Spa ARMED LATEROCEMENTITIOUS BEAM.
FR2548718A1 (en) * 1983-07-08 1985-01-11 Brochet Denis Devices eliminating the damage caused by shoring to the underfaces of the insulating floors ribbed with reinforced concrete
IT238642Y1 (en) * 1995-06-08 2000-11-13 Barbieri Ignazio BRICK BASE FOR PREFABRICATED BEAMS WITH LATTICE

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1445391A2 (en) * 2003-02-03 2004-08-11 Coperlegno S.R.L. Prefabricated components for making floor slabs, floors and walls with exposed wood beams
EP1445391A3 (en) * 2003-02-03 2005-09-21 Coperlegno S.R.L. Prefabricated components for making floor slabs, floors and walls with exposed wood beams
US7281357B2 (en) 2003-02-03 2007-10-16 Coperlegno S.R.L. Prefabricated components for making floor slabs, floors and walls with exposed wood beams for small buildings
US7784235B2 (en) 2004-05-11 2010-08-31 Plastedil S.A. Load bearing construction element, in particular for manufacturing building floors, and floor structure incorporating such element
EP1756375B1 (en) * 2004-05-11 2012-01-04 Plastedil S.A. Load bearing construction element in particular for manufacturing building floors and floor structure incorporating such element
WO2009010366A1 (en) * 2007-07-19 2009-01-22 Leone, Lucio Improved girders for reinforcing concrete and method for connecting them to pillars in order to provide continuity from bay to bay
FR2956139A1 (en) * 2010-02-08 2011-08-12 Gerard Sekrane Formwork element for construction of self-supporting girder to construct building, has section receiving units to partially drown metal reinforcement and made of composite material to ensure resistance against fire of self-supporting girder
EP2444567A1 (en) * 2010-02-08 2012-04-25 Gérard Sekrane Formwork element for building a beam
ITVI20100246A1 (en) * 2010-09-10 2012-03-11 Ugo Zanrosso BASE IN LATERIZIA FOR THE PREPARATION OF PREFABRICATED BEAMS WITH ELECTRO-WELDED TRALICCIA AND LONGITUDINAL ARMOR
FR3023312A1 (en) * 2014-07-07 2016-01-08 Isoltop POUTRELLE FOR MAKING A FLOOR
WO2016005679A1 (en) 2014-07-07 2016-01-14 Isoltop (Sas) Girder for making a floor

Also Published As

Publication number Publication date
ITVI970056A1 (en) 1997-07-11
IT1292977B1 (en) 1999-02-11
ITVI970056A0 (en) 1997-04-11
HRP980200A2 (en) 1999-02-28
EP0870883A3 (en) 1999-11-24

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