EP1646755A2 - Prefab floor element with external reinforcement and a method of manufacturing such a prefab floor element - Google Patents
Prefab floor element with external reinforcement and a method of manufacturing such a prefab floor elementInfo
- Publication number
- EP1646755A2 EP1646755A2 EP04748727A EP04748727A EP1646755A2 EP 1646755 A2 EP1646755 A2 EP 1646755A2 EP 04748727 A EP04748727 A EP 04748727A EP 04748727 A EP04748727 A EP 04748727A EP 1646755 A2 EP1646755 A2 EP 1646755A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- reinforcement member
- floor element
- reinforcement
- concrete layer
- concrete
- 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.)
- Granted
Links
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
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/10—Load-carrying floor structures formed substantially of prefabricated units with metal beams or girders, e.g. with steel lattice girders
-
- 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
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
Definitions
- the present invention relates to a prefab floor element having an underside and upper side, which latter side forms the bearing side, which floor element comprises a concrete layer incorporating a first reinforcement member and at the underside of the floor element a partly external, second reinforcement member.
- prefab elements such as prefab floor elements are very popular.
- a 1 prefab floor element known from EP 0 450 682 comprises a con- crete layer with a first pre-tensioned reinforcement member.
- the floor element has a second reinforcement member, whose base is formed by two straight rods, which via a zigzag wire are connected with a third straight rod. In its longitudinal direction, the second reinforcement member has a V-shaped cross section.
- the prefab floor element according to the invention is characterised in that the first reinforcement member is a netted first reinfo cement member and the non-external portion of the second reinforcement member partly extends through openings of the netted reinforcement member coming close to the bearing surface.
- the prefab floor element according to the invention is stronger or equally strong and lighter (and therefore cheaper) while having a concrete layer of the same thickness. In the latter case fewer second reinforcement members are needed and there is more freedom with respect to the instal- lation of pipes between the lowered ceiling and the underside of the concrete layer.
- the second reinforcement member in particular the opening formed by the external portion of the reinforcement and the underside of the floor element formed, can be used for passing through conduits, and if such a floor element is used as floor element of a storey or roof, for securing a lowered ceiling. There is no need to pre-tension the reinforcement and this favourably affect the cost price of the prefab floor element.
- the invention also relates to a method of manufacturing a concrete prefab floor element having internal and external reinforcement, by pouring a layer of concrete on the upper side of a formwork, wherein a first reinforcement member is incorporated into the concrete layer and a second re- inforce ent member is partly incorporated into the concrete layer, wherein the portion of the second reinforcement member that is not incorporated in the concrete layer comprises a rod-like element that serves for absorbing the tensile forces while the floor element is in use, and the concrete is al- lowed to set, resulting in a ready floor element that is separated from the formwork.
- a floor element is manufactured on its end face by pouring concrete on a formwork.
- a first, pre-tensioned reinforcement member is incorporated.
- the second reinforcement member comprises a base formed by two straight rods connected via a zigzag wire with a third straight rod.
- the second reinforcement member has a V-shaped cross section, and the two straight rods are placed between first reinforcement members and incorporated into the concrete, while the third rod projects therefrom.
- a floor element manufactured by the known method has a reduced weight. Furthermore, when using smooth formwork, a bearing side is obtained that requires no further finishing. Traditional floor elements, whose rein- forcement is entirely internal, need a relatively large portion of the materials used for carrying the weight of the floor element itself.
- the second rein- forcement member used is a traditional joist for concrete slabs, which is partly incorporated into the concrete slab.
- the object of the invention to provide a simplified method of manufacturing a prefab 'floor element.
- the method according to the invention is characterised in that as the first reinforcement member a netted reinforcement member is used, the portion of the second reinforcement member incorporated into the concrete layer is partly inserted through openings of the netted reinforce- ment member, and the concrete is allowed to set, resulting in the reinforced prefab floor element.
- the second reinforcement according to the invention a thinner floor having the same bearing capacity can be manufactured or an equally thick floor having a greater bearing capacity.
- the first reinforcement can be placed more closely to the underside of the floor.
- the second reinforcement cannot be incorporated deeply in the concrete, and without the two rods to be incorporated in the concrete, the connection between them is poor.
- the reinforcement members can be placed independently of each other (at least, provided the portions of the second reinforcement member incorporated in the concrete layer are allowed to project at least partly into the openings of the first netted reinforcement member) .
- the netted reinforcement member is located as closely as possible to the underside.
- the portions of the second reinforcement member incorporated in the concrete, which face toward the bearing surface are located as closely as possible to the bearing surface.
- the thickness of the concrete layer under the first, netted reinforcement member in the finished state of the floor element), may be considerably thinner.
- the reinforcement member will generally be made of steel, it does not exclude plastic, fibres (such as glass fibres and carbon fibres) and composites of these. Likewise, the reinforcement may have any shape, such as an I- or T-section, a spiral shape, which shapes may contribute to an improved strength or better bonding with the concrete layer.
- bearing surface or bearing side it means that after the prefab floor element has been placed, that side requires no further finishing.
- prefab floor element also encompasses a roofing floor, where the floor element serves as ceiling.
- the second reinforcement in particular the openings formed by the external part of the reinforcement and the underside of the formed floor element may be used for passing through con- duits and in the case where such a floor element is used as floor element of a storey or roof, for fastening a lowered ceiling.
- a reinforcement is used as the second reinforcement, which in addi- tion to the rod-like part comprises a further part having a saw tooth or zigzag profile, wherein points of the saw teeth or zigzag project through openings of the first reinforcement member.
- Such a second reinforcement member is easily manu- factured and provides excellent strength.
- the first netted reinforcement member in the finished prefab floor element is located in the bottom 35%, preferably in the bottom 25% of the thickness of the concrete layer.
- the points of the second reinforcement member are located in the top 35%, preferably in the top 25% of the thickness of the concrete layer.
- the points of the saw tooth or zigzag profile are preferred to form a V in the longitudinal di- rection, with the points projecting, for example, alternately to the left or right.
- Another repeating pattern is also possible, and also a W-configuration.
- the second reinforcement member it is preferred to use a reinforcement member having at least at one of its ends an end portion that extends substantially perpendicularly to the one plan-e of the second reinforcement. Such an end portion facilitates easy positioning of the second reinforcement member without it being able to fall over. This renders the manufacture of the prefab floor less labour-intensive. It is also useful for anchoring the second reinforcement member in the concrete layer.
- Fig. 1 shows a cross section through a finished prefab floor element according to the invention placed on the upper side of two walls
- Fig. 2 shows a cross section through the prefab floor element of Fig. 1 according to the line II-II; Fig.
- FIG. 3 shows a detail of an end of the prefab floor element of Fig. 1;
- Fig. 4 schematically shows a cross section along the line IV-IV in Fig. 1.
- Figs. 5, 6 and 7 show three possibilities of connecting the prefab floor elements according to the invention.
- Fig. 1 shows a prefab floor element 1 according to the invention in cross section, comprising a concrete layer 2 having an underside 3 and a upper side 4.
- the upper side 4 forms the bearing surface.
- Incorporated in the concrete layer 2 are a first reinforcement member 5 of the kind well known in the art (in Fig. 2 shown to be netted) , as well as a second reinforcement member 6 according to the invention.
- the second reinforcement member 6 comprises two kinds of elements, a rod-like element 7 and two members having a zigzag profile 8a, 8b.
- the pointed ends 9 of the zigzag profile of the members 8a, 8b project through the first reinforcement member 6 coming close to the upper side 4 of the concrete layer 2.
- the ends 10, 11 of the concrete layer 2 of the prefab floor element 1 reinforced with the first reinforcement member 6, project beyond the rod-like element 7.
- the free ends 10, 11 of the prefab floor element shown in Fig. 1 is supported on two walls A, A r .
- the term "defined uniform thickness" does not exclude the possibility of the ends having a profile to match the walls A, A' , and augmenting the connection between walls A, A', and the prefab floor element 1.
- the zigzag elements 8a, 8b are connected with the rod-like element 7 by means of, for example, welding.
- the rod-like element 7 is a rod-like element 7 that is under strain of tension. It is preferably manufactured from the usual reinforcing steel and a suitable diameter for a prefab floor 1 with a span of 5.4 m is 16 mm, wherein the second re- inforcement members are spaced approximately 1.2 m from each other.
- zigzag elements 8a, 8b it is also possible to use one single continuous zigzag element 8 (not shown). However, near the middle of the rod-like element 7, the zigzag elements 8a, 8b contribute little to the strength of the prefab floor and may be omitted.
- Fig. 2 shows the openings 12 of the netted first reinforcement member 5, through which the pointed ends 9 (seen in Fig. 1) project.
- the second reinforcement member 6, and more in particular one end of each of the elements with zig- zag profile 8a, 8b, is provided with end portions 13a, 13b, which fulfil two functions. When manufacturing the prefab floor element 1, they help to prevent the second reinforcement members 6 from falling over.
- Fig. 3 shows an end 10 of the prefab floor element 1 depicted in Fig. 1, wherein as usual the reference numerals correspond with the above-described elements.
- Fig. 4 depicts the concrete layer 2, the first netted reinforcement member 5 and the second reinforcement member 6.
- the second reinforcement member 6 is placed perpendicularly on the first reinforcement member 5.
- the first -reinforcement member 5 extends parallel to the upper side 4 of the concrete layer 2.
- the prefab floor elements 1 according to the invention can be placed to abut against each other so as to form a larger floor element (or ceiling element) .
- FIG. 5 depicts a simple embodiment, in which the floor element 1 tapers slightly towards the bearing surface (which during manufacture may also aid separation) , and whereby a V-shaped groove is formed when two prefab floor elements 1, 1' are placed so as to abut against each other. In practice this will be filled with, for example, mortar B.
- the prefab floor elements 1, 1 ' may also have sides that overlap, as shown in Fig. 6.
- a strip of metal 16, 16 f may during manufacture of the concrete layer 2 be embedded in the longitudinal sides of the concrete layer 2, which strips 16, 16' are connected with the netted reinforcement member 5, 5' by reinforcement means 15, 15' .
- the longitudinal sides form a V-shaped groove, into which a wire 17 is placed.
- the wire 17 is welded to the strips 16, 16 f after which the V- shaped groove is filled with mortar, rubber or the like.
- the reinforcement or parts thereof may consist of materials other than metal, such as (super) fibres, the person skilled in the art is familiar with the various types (Twaron, Dyneema, glass fibre, carbon fibre, etc.) .
- the prefab floor element will be a rectangular prefab floor element.
- the rod-like element of a second reinforcement member will in general extend substantially perpendicularly to the ends of the floor ele- ment. If it is desirable to keep the second reinforcement at a specific distance from the (final) top surface of the prefab floor element, it is possible to use spacers, such as two rings fastened to the bent end of the second reinforcement.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Panels For Use In Building Construction (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1023875A NL1023875C2 (en) | 2003-07-10 | 2003-07-10 | Prefab floor part with external reinforcement and a method for manufacturing such a prefab floor part. |
PCT/NL2004/000501 WO2005005740A2 (en) | 2003-07-10 | 2004-07-09 | Prefab floor element with external reinforcement and a method of manufacturing such a prefab floor element |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1646755A2 true EP1646755A2 (en) | 2006-04-19 |
EP1646755B1 EP1646755B1 (en) | 2007-02-07 |
Family
ID=34056980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04748727A Not-in-force EP1646755B1 (en) | 2003-07-10 | 2004-07-09 | Prefab floor element with external reinforcement and a method of manufacturing such a prefab floor element |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1646755B1 (en) |
AT (1) | ATE353385T1 (en) |
DE (1) | DE602004004660D1 (en) |
NL (1) | NL1023875C2 (en) |
WO (1) | WO2005005740A2 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1936718A1 (en) * | 1969-07-18 | 1971-02-04 | Georg Hubmann | Prefabricated reinforced concrete shell for the production of shell concrete on concrete bodies |
DE1951565A1 (en) * | 1969-10-13 | 1971-04-22 | J Krueckl Eisenhandel Ohg Dipl | Reinforced reinforced concrete part |
DE2929350A1 (en) * | 1979-07-20 | 1981-02-12 | Ulrich Dipl Ing Fiergolla | Composite beams for building ceilings |
US5884442A (en) * | 1997-03-28 | 1999-03-23 | Structural Systems Ltd. | Composite joist and concrete panel assembly |
-
2003
- 2003-07-10 NL NL1023875A patent/NL1023875C2/en not_active IP Right Cessation
-
2004
- 2004-07-09 WO PCT/NL2004/000501 patent/WO2005005740A2/en active IP Right Grant
- 2004-07-09 DE DE602004004660T patent/DE602004004660D1/en active Active
- 2004-07-09 AT AT04748727T patent/ATE353385T1/en not_active IP Right Cessation
- 2004-07-09 EP EP04748727A patent/EP1646755B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2005005740A3 * |
Also Published As
Publication number | Publication date |
---|---|
NL1023875C2 (en) | 2005-01-11 |
EP1646755B1 (en) | 2007-02-07 |
WO2005005740A2 (en) | 2005-01-20 |
WO2005005740A3 (en) | 2005-03-31 |
DE602004004660D1 (en) | 2007-03-22 |
ATE353385T1 (en) | 2007-02-15 |
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