Classifications

• • 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
  • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
  • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
  • E04C2/044—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of concrete
• • 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
  • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
  • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
  • E04C2/049—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres completely or partially of insulating material, e.g. cellular concrete or foamed plaster
• • 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
  • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
  • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
  • E04C2/284—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
  • E04C2/288—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating composed of insulating material and concrete, stone or stone-like material

Definitions

• the present invention relates generally to a method for lifting lightweight concrete elements and a lightweight concrete element.
• Lightweight concrete elements can for example be building elements.
• Regular concrete elements have an internal structure strong enough to be able to have for example metal loops fully embedded into the concrete, in which for example lifting bands or chains can be attached in order to be lifted by a crane.
• elements of lightweight concrete have a material structure too weak to safely attach such embedded metal loops into the material alone, without having the risk of ripping them from the material when the element is lifted.
• a known solution to this problem is to, during the casting process of the lightweight concrete element, mount a metal loop, hook or similar flushed into the lightweight concrete at the thickness side or surface side of the element, so that it is also hooked into a, in the building element existing, armouring.
• the metal loop is flush with the lightweight concrete element, so that it does not eject up over the element surface.
• a disadvantage with this method is that the metal loop/loops remains in the element or requires a working operation to be removed. Further, during lifting the load is concentrated on quite a small area. When mounted at the thickness side, the element is easily damaged during lifting.
• An object of the present invention is to create an improved method of lifting a building element of lightweight concrete with a crane, from for example a container or a truck at the construction site.
• a method for lifting lightweight concrete elements comprises the steps of
• the recess extends from a first surface side to a second surface side, even though it is possible that it extends from a first surface side to an edge side or even from an edge side to an edge side by a corner.
• a method according to the above is advantageous with regard to both safety and material— and work time savings.
• At least one of the through-going recesses is positioned so that it passes through an opening in an armouring net, which is casted into the lightweight concrete element.
• one or several sleeves is casted into the lightweight concrete element in order to accomplish one or several thorough-going recesses.
• a though-going recess is casted into a vicinity of a first corner of the lightweight concrete element and a second through-going recess is casted into a second corner, whereby the corners are positioned at the same side edge.
• a sleeve shall be considered to be anything possible to maintain a hole in the material during casting. It may have any cross section, such as circular or quadratic, or be provided with side extending elongated openings or other recesses.
• the sleeve can also be build up out of several sleeve parts, such as two cross sectional circle segments, arranged so that a complete circle is established.
• one or several sleeves can be removed from the lightweight concrete element after the element has been lifted into the desired position. In this way the sleeves can be reused.
• one or several thorough-going recesses are refilled after that the element is lifted into the desired position.
• the recesses are refilled with the same type of building mass as the lightweight concrete element is casted of.
• a lightweight concrete element is accomplished, which comprises one or several through-going recesses arranged for introduction of lifting arrangements therein.
• the recess is extending through the lightweight concrete element from its first surface side, for example the inside of the element, to its second surface side, for example the outside of the element, even though it is possible that it can extend from a surface side to an edge side or even from an edge side to an edge side by and edge.
• At least one recess is positioned so that is extends through one opening in an embedded armouring net.
• one or several sleeves is arranged to be embedded into the lightweight concrete element in order to accomplish one or several through-going recesses.
• the sleeves are provided with a release agent on their outer surface.
• fig. 1 discloses a lightweight concrete element according to one embodiment with two recesses through which a lifting arrangement is arranged
• fig. 2a-2d discloses different positioning of a recess in a lightweight concrete element
• fig. 3 discloses a detail view of a sleeve arranged in a lightweight concrete element
• fig. 4 discloses one embodiment of a lightweight concrete element with four recesses
• fig. 5 discloses the filling of a recess.
• At least one through-going recess 1 is created in a lightweight concrete element 2 already during casting of the lightweight concrete element.
• the through-going recess is extending from a first surface side 4 to a second surface side 5, see figure 2a, even though it is possible that it can extend from a surface side 4 to an edge side 6, see figure 2b, or even from an edge surface 6 to an edge surface 6 by a corner, see figure 2c.
• figure 2d it is disclosed ⁇ positioning of ⁇ though-going recess 1 , so that it is passing through an opening 8 in an armouring net 9.
• the armoring net is disclosed by break-through lines since it is casted into the element 2.
• a preferred way of accomplishing a through-going recess 1 in a lightweight concrete element 2 is to arrange a sleeve 10 at a desired position during casting of the lightweight concrete element 2, see figure 3.
• the sleeve 10 is considered to be anything possible to maintain a hole in the material during casting. It may have any cross section, such as circular or quadratic, or be provided with side extending elongated openings or other recesses.
• the sleeve can also be build up out of several sleeve parts, such as two cross sectional circle segments, arranged so that a complete circle is established.
• the sleeve is made of plastic, for example with a diameter of 70 mm.
• the length of the sleeve preferably relates to the thickness of the element.
• the lightweight concrete element can have a thickness of for example, 200-400 mm, a length of for example 4-6 mm and a width of for example 2-4 m. But of course are larger or smaller measures also possible.
• the armouring can be composed of, for example, one or two armouring nets 9 with, for example, 150x150 mm openings 8 and thickness of the armouring of, for example, 6-10 mm.
• two through-going recesses 1 are used when wall elements are considered, see figure 1 .
• two sleeves 10 are mounted in the upper corners 7 of the element 2, one in each corner 7. For example approximately 70 cm in from both corners 7 of the element if the element 2 is to be lifted and mounted in an upright position.
• a strap, a rope, a chain or similar is lead and is hooked for example with its self on the other side to create a lifting arrangement 3, for example in the shape of a loop.
• the lifting arrangement 3 can lift the lightweight concrete element 2 in an upright position in the air and place it on its intended place at the construction site.
• the sleeves 10 also have a protective function for the lightweight concrete element.
• the sleeves are protecting the lightweight concrete element against pressure or chafe from the lifting arrangement while lifting.
• the surfaces of the elements 2 are separated by for example rectangular plates of any distance material, such as wood, during transport in a container or similar. Thereby there is space enough to run the lifting arrangement 3 between two elements 2.
• the sleeves 10 can be knocked out of the element 2 in order to be reused.
• the outer surface of the sleeves 10 can be prepared with a release agent before they are mounted in the mould in the factory during casting of the elements 2.
• the through-going recess is preferably filled with material 12 when the element 2 is in place, preferably with a building mass of the same material as in the element 2, see figure 5.
• material 12 when the element 2 is in place, preferably with a building mass of the same material as in the element 2, see figure 5.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Conveying And Assembling Of Building Elements In Situ (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=43032401

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (3)

• 2009
  • 2009-04-30 SE SE0900591A patent/SE534087C2/sv not_active IP Right Cessation
• 2010
  • 2010-04-30 WO PCT/SE2010/050478 patent/WO2010126447A1/en active Application Filing
  • 2010-04-30 EP EP10770035A patent/EP2425067A1/en not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events