CA2812497A1 - Pre-stressed compact beam and method for its manufacture - Google Patents
Pre-stressed compact beam and method for its manufacture Download PDFInfo
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- CA2812497A1 CA2812497A1 CA2812497A CA2812497A CA2812497A1 CA 2812497 A1 CA2812497 A1 CA 2812497A1 CA 2812497 A CA2812497 A CA 2812497A CA 2812497 A CA2812497 A CA 2812497A CA 2812497 A1 CA2812497 A1 CA 2812497A1
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000005452 bending Methods 0.000 claims abstract description 21
- 230000007935 neutral effect Effects 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract 3
- 239000000463 material Substances 0.000 claims description 16
- 238000004026 adhesive bonding Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 3
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 230000003993 interaction Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 238000005304 joining Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- 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
- E04B5/12—Load-carrying floor structures formed substantially of prefabricated units with wooden beams
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/122—Laminated
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/18—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with metal or other reinforcements or tensioning members
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/18—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with metal or other reinforcements or tensioning members
- E04C3/185—Synthetic reinforcements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Electromagnetism (AREA)
- Composite Materials (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Rod-Shaped Construction Members (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Pre-stressed beams where two outer elements (10-12) being symmetrical or near symmetrical along the neutral axis of the cross-section of the beam, are joined together by means of a center element (11) after bending and mutual sliding of the element surfaces. The outer elements (10, 12) are held together by means of the shear transmitting center element (11) arranged for mechanical and/ or chemical transmission of forces. A method for the manufacture of such beams is also provided.
Description
Pre-stressed compact beam and method for its manufacture The invention relates to pre-stressed beams having compact cross-sectional areas where the structural elements comprises two bent,-pre-stressed, symmetrical or near symmetrical outer elements which are joined together in the bent, pre-stressed condition.
The invention also relates to a method for the manufacture of such pre-stressed beams.
By "outer elements" in this connection is understood long, compact elements of compact material such as woodwork or composite materials having a shape and properties making them useful as supporting beams.
Background It is common to manufacture beams and floors with cross-sectional shapes that imply good material exploitation, such as the H-profile and the I-profile. It is also common to make beams with super elevation in order to obtain a reduction in the resulting deflection where the deformation requirements are decisive for the dimensioning.
In the production of concrete is known to cast beams and supporting elements with pre-stressed armouring steel rods in order to obtain super elevation and increased supporting ability, e.g.
hollow core floorings.
Of earlier patented solutions we refer to US patent No 4 754 718, US patent No. 2 039 398, DE 2 335 998, GB patent No. 1 305 645 and Norwegian patent No. 162124.
Objectives The main objective of the present invention is to provide a method for pre-stressing and joining of compact beams for use in building constructions and plants, providing an optimal material exploitation as well as versatility in the choice of cross-sectional shape, so that available raw materials can be better exploited.
It is furthermore a significant object to be able to proportion the pre-stressing so that the initial shape (i.e. the super elevation) can be adapted to the relevant functional requirements with regard to user needs, span, load, governmental regulations etc.
The present invention According to the present invention the above objectives can be achieved by the principle solution defined by claim 1, in which two outer beam elements are joined by means of a center element subsequent to bending and mutual sliding displacement of the elements.
According to another aspect the present invention concerns the manufacture of such a beam as defined by claim 6.
The invention also relates to a method for the manufacture of such pre-stressed beams.
By "outer elements" in this connection is understood long, compact elements of compact material such as woodwork or composite materials having a shape and properties making them useful as supporting beams.
Background It is common to manufacture beams and floors with cross-sectional shapes that imply good material exploitation, such as the H-profile and the I-profile. It is also common to make beams with super elevation in order to obtain a reduction in the resulting deflection where the deformation requirements are decisive for the dimensioning.
In the production of concrete is known to cast beams and supporting elements with pre-stressed armouring steel rods in order to obtain super elevation and increased supporting ability, e.g.
hollow core floorings.
Of earlier patented solutions we refer to US patent No 4 754 718, US patent No. 2 039 398, DE 2 335 998, GB patent No. 1 305 645 and Norwegian patent No. 162124.
Objectives The main objective of the present invention is to provide a method for pre-stressing and joining of compact beams for use in building constructions and plants, providing an optimal material exploitation as well as versatility in the choice of cross-sectional shape, so that available raw materials can be better exploited.
It is furthermore a significant object to be able to proportion the pre-stressing so that the initial shape (i.e. the super elevation) can be adapted to the relevant functional requirements with regard to user needs, span, load, governmental regulations etc.
The present invention According to the present invention the above objectives can be achieved by the principle solution defined by claim 1, in which two outer beam elements are joined by means of a center element subsequent to bending and mutual sliding displacement of the elements.
According to another aspect the present invention concerns the manufacture of such a beam as defined by claim 6.
2 By a "center element" in this connection is understood a shear transmitting element having shape and properties which allows it to hold the outer elements together in a pre-stressed, rigid structure.
The present solution is distinguished over the prior art by providing new possible cross-sectional shapes, versatility with regard to method of joining and a higher load capacity without increasing the material consumption.
The center element can be manufactured in the same material as the outer elements or by a material having a higher shear capacity. The joining may be made mechanically by arranging the outer elements and the center element to be "locked" together at a certain pre-bending or as a result of pressing/ adhering.
The finished, shear pre-stressed beam has in unloaded condition a tension(stress) reserve and super elevation which can be proportioned according to predetermined functional requirements.
As an example the pre-stressing can be dimensioned such that a resulting deflection at normally occurring loads on the beam is minimal or near zero. With regard to beams for which requirements of deformation is decisive for the dimensioning, e.g. beams in wooden supporting elements, the method allows much larger spans than traditional methods.
Exemplary description The invention is illustrated in the accompanying drawings, where:
Figure 1A is a schematic side view of assembled beam elements in non-loaded condition.
Figure 1B shows the elements of Figure 1A after pre-bending, mutual sliding, joining and unloading.
Figure 1C shows principle-detail of center element made in same material as outer elements and made with a shape providing mechanical force transmission.
Figure 1D shows principle-detail of center element made in a material of higher shear capacity than outer elements, made in a shape providing mechanical force transmission.
Figure 1E shows the joined beam of Figure 1B with an evenly distributed outer load.
Figure 1F shows principle-diagrams for bending and normal stresses in the joined beam of Figure 1E.
Figure 1G shows principle-diagrams for shear stresses in the joined beam of Figure 1E.
Figures 2A-C show examples of relevant cross-sections of pre-stressed compact supporting beams.
Figures 3A-C are perspectival views of relevant compact supporting beams.
Figures 4A-C show examples of supporting (floor?) elements in which the supporting beam of Figure 2A is used.
The present solution is distinguished over the prior art by providing new possible cross-sectional shapes, versatility with regard to method of joining and a higher load capacity without increasing the material consumption.
The center element can be manufactured in the same material as the outer elements or by a material having a higher shear capacity. The joining may be made mechanically by arranging the outer elements and the center element to be "locked" together at a certain pre-bending or as a result of pressing/ adhering.
The finished, shear pre-stressed beam has in unloaded condition a tension(stress) reserve and super elevation which can be proportioned according to predetermined functional requirements.
As an example the pre-stressing can be dimensioned such that a resulting deflection at normally occurring loads on the beam is minimal or near zero. With regard to beams for which requirements of deformation is decisive for the dimensioning, e.g. beams in wooden supporting elements, the method allows much larger spans than traditional methods.
Exemplary description The invention is illustrated in the accompanying drawings, where:
Figure 1A is a schematic side view of assembled beam elements in non-loaded condition.
Figure 1B shows the elements of Figure 1A after pre-bending, mutual sliding, joining and unloading.
Figure 1C shows principle-detail of center element made in same material as outer elements and made with a shape providing mechanical force transmission.
Figure 1D shows principle-detail of center element made in a material of higher shear capacity than outer elements, made in a shape providing mechanical force transmission.
Figure 1E shows the joined beam of Figure 1B with an evenly distributed outer load.
Figure 1F shows principle-diagrams for bending and normal stresses in the joined beam of Figure 1E.
Figure 1G shows principle-diagrams for shear stresses in the joined beam of Figure 1E.
Figures 2A-C show examples of relevant cross-sections of pre-stressed compact supporting beams.
Figures 3A-C are perspectival views of relevant compact supporting beams.
Figures 4A-C show examples of supporting (floor?) elements in which the supporting beam of Figure 2A is used.
3 PCT/N02011/000262 Symbol explanations = neutral axis lower element, Z2 = neutral axis upper element, Z0= neutral axis joined beam, a = distance between Z1 and Z2, t = net thickness center element, f = bending and normal stress, and t= shear stress.
Neutral axis refers to the position in a beam having zero length change when exposed to an elastic bending moment.
Figure 1. Principle drawing Figure 1A shows schematically a side view of the beam elements 10, 11 and 12 in non-loaded condition.
The outer elements 10 and 12 are symmetrical or near symmetrical about axis Z0. This ensures a favourable stress distribution across the cross-section and correspondingly good material exploitation. The elements can e.g. be made in woodwork, composite or other elastic material.
The center element 11 can be made in same type of material as outer elements (Figure 1C) or in a material having a higher shear capacity (Figure 1D).
Figure 1B shows elements of Figure 1A after having been pre-bent, joined, and unloaded.
The pre-bending, which is performed with a hydraulic press or the like, known equipment, implies a sliding motion in the contacting surfaces of the elements. At the joining and unloading a shear flow occurs between the center element 11 and outer elements 10 and 12, as indicated with arrows in Figure 1B. The shear transmission can be made mechanically (e.g.
with an adapted surface structure) or chemically (by gluing/ adhering).
Figures 1C-D show principle-details of center element, designed with a surface structure which implies that the elements 10, 11, and 12 are locked together in a pre-stressed, rigid structure at a certain degree of pre-bending.
In addition to shear transmitting function (pre-stressing) the center element provides an increase of the beam's load capacity by increasing the distance between the neutral axises Z1 og Z2. For some types of beams and dimensions this capacity increase amounts to more than 50%, see the enclosed calculation example.
If the center element is made in a sufficiently hard material, the shear transmitting (pre-stressing) can be obtained by pressing the elements together in a pre-bent condition. The beam thereby may be produced without milling or gluing.
Neutral axis refers to the position in a beam having zero length change when exposed to an elastic bending moment.
Figure 1. Principle drawing Figure 1A shows schematically a side view of the beam elements 10, 11 and 12 in non-loaded condition.
The outer elements 10 and 12 are symmetrical or near symmetrical about axis Z0. This ensures a favourable stress distribution across the cross-section and correspondingly good material exploitation. The elements can e.g. be made in woodwork, composite or other elastic material.
The center element 11 can be made in same type of material as outer elements (Figure 1C) or in a material having a higher shear capacity (Figure 1D).
Figure 1B shows elements of Figure 1A after having been pre-bent, joined, and unloaded.
The pre-bending, which is performed with a hydraulic press or the like, known equipment, implies a sliding motion in the contacting surfaces of the elements. At the joining and unloading a shear flow occurs between the center element 11 and outer elements 10 and 12, as indicated with arrows in Figure 1B. The shear transmission can be made mechanically (e.g.
with an adapted surface structure) or chemically (by gluing/ adhering).
Figures 1C-D show principle-details of center element, designed with a surface structure which implies that the elements 10, 11, and 12 are locked together in a pre-stressed, rigid structure at a certain degree of pre-bending.
In addition to shear transmitting function (pre-stressing) the center element provides an increase of the beam's load capacity by increasing the distance between the neutral axises Z1 og Z2. For some types of beams and dimensions this capacity increase amounts to more than 50%, see the enclosed calculation example.
If the center element is made in a sufficiently hard material, the shear transmitting (pre-stressing) can be obtained by pressing the elements together in a pre-bent condition. The beam thereby may be produced without milling or gluing.
4 The center element can be made in short lengths and e.g. be casted in moulds.
It is assumed that the design allows a sliding motion between the elements when the pre-bending takes place.
For beams with a "narrowed" central section, the elements can be made with longitudinal grooves to obtain a sufficient contact area and the joining can be made chemically by gluing/ adhering.
Figure 1E shows the joined beam when an external load has been applied.
Figure 1F shows principle-diagrams for bending and normal stresses from:
(1) Pre-bending/ unloading, (2) stresses from external load, and (3) resulting stress.
At high pre-stressing symmetrical cross-sections can achieve a substantially plastic stress distribution when an evenly distributed load is applied ¨ without plastification of the material.
This allows a maximum exploitation of the beam's cross-sectional area with regard to load capacity. In practice a reduced super elevation will be more relevant and the deformation requirements will be decisive for the choice of pre-stress.
Figure 1G shows principle-diagram for shear stresses from:
(1) pre-bending/ unloading, (2) stress from external load, and (3) resulting stress.
By the principle diagram 1F is shown that the beam bending stress reserve corresponds to the stress level after pre-bending and unloading. The beam must therefore be dimensioned for the sum of shear stress from pre-bending/ unloading and from external loads. For relevant beam types and spans this reduction has little practical significance.
Figure 2. Example of beam cross-sections In Figure 2A a compkt rectangular beam comprising outer elements 21 and 23 and center element 22 is shown. The beam is joined during pre-bending by means of adapted surface structures/ pressing.
In Figure 2B a compact beam with substantially circularly cross-section (e.g.
round timber) comprising outer elements 24 and 26 and center element 25, is shown. The beam is joined during pre-bending by means of adapted surface structures / pressing.
In Figure 2C a compact beam comprising outer elements 27 and 29 as well as a "narrowed" center element 28, is shown. The elements are made with longitudinal grooves and joined during pre-bending by means of adhering/ gluing.
Figure 3. Perspectival views of beams Figures 3A to 3C all show examples of compact wooden beams.
Figure 4. Supporting beam in floor elements Examples of floor elements based on the current principle as illustrated by Figure 2A.
Figure 4A shows an example of a "rib floor", Figure 4B shows an example of a "beam floor" while Figure 4C shows an example of a "compact floor".
It is assumed that the design allows a sliding motion between the elements when the pre-bending takes place.
For beams with a "narrowed" central section, the elements can be made with longitudinal grooves to obtain a sufficient contact area and the joining can be made chemically by gluing/ adhering.
Figure 1E shows the joined beam when an external load has been applied.
Figure 1F shows principle-diagrams for bending and normal stresses from:
(1) Pre-bending/ unloading, (2) stresses from external load, and (3) resulting stress.
At high pre-stressing symmetrical cross-sections can achieve a substantially plastic stress distribution when an evenly distributed load is applied ¨ without plastification of the material.
This allows a maximum exploitation of the beam's cross-sectional area with regard to load capacity. In practice a reduced super elevation will be more relevant and the deformation requirements will be decisive for the choice of pre-stress.
Figure 1G shows principle-diagram for shear stresses from:
(1) pre-bending/ unloading, (2) stress from external load, and (3) resulting stress.
By the principle diagram 1F is shown that the beam bending stress reserve corresponds to the stress level after pre-bending and unloading. The beam must therefore be dimensioned for the sum of shear stress from pre-bending/ unloading and from external loads. For relevant beam types and spans this reduction has little practical significance.
Figure 2. Example of beam cross-sections In Figure 2A a compkt rectangular beam comprising outer elements 21 and 23 and center element 22 is shown. The beam is joined during pre-bending by means of adapted surface structures/ pressing.
In Figure 2B a compact beam with substantially circularly cross-section (e.g.
round timber) comprising outer elements 24 and 26 and center element 25, is shown. The beam is joined during pre-bending by means of adapted surface structures / pressing.
In Figure 2C a compact beam comprising outer elements 27 and 29 as well as a "narrowed" center element 28, is shown. The elements are made with longitudinal grooves and joined during pre-bending by means of adhering/ gluing.
Figure 3. Perspectival views of beams Figures 3A to 3C all show examples of compact wooden beams.
Figure 4. Supporting beam in floor elements Examples of floor elements based on the current principle as illustrated by Figure 2A.
Figure 4A shows an example of a "rib floor", Figure 4B shows an example of a "beam floor" while Figure 4C shows an example of a "compact floor".
5 Calculation example Freely suspended beam with evenly distributed load and span L = 6 m.
Raw material: Round timber (i.e. limited availability at increasing dimensions).
Outer elements: Split round timber with 250 mm diameter.
Center element: Rectangular, net thickness = t Cross-section: See Fig. 2B.
Basic value: Load capacity calculated for center element t=0 and pre-stressing corresponding to a super elevation of L/100, i.e. 6 cm after unloading.
Capacity increase for various thicknesses of center element:
Thickness t=30 mm: about 40 % increase Thickness t=40 mm: about 55 % increase Thickness t=50 mm: about 70 % increase Advantages of the present invention The beam as described above is distinguished from prior art techniques and patented solutions by:
1. Allowing compact beams to be produced with desired pre-stressing without adhering/ gluing, ref. Figs. 2A-B.
2. Allowing use of new pre-stressed cross-sectional shapes, see, Figs. 2C and 3C.
3. The method is well suited for beams in floor elements of increased spans, see Figs. 4A-C.
4. The method provides possibility of improved utilization of the basic material, see calculation example.
Raw material: Round timber (i.e. limited availability at increasing dimensions).
Outer elements: Split round timber with 250 mm diameter.
Center element: Rectangular, net thickness = t Cross-section: See Fig. 2B.
Basic value: Load capacity calculated for center element t=0 and pre-stressing corresponding to a super elevation of L/100, i.e. 6 cm after unloading.
Capacity increase for various thicknesses of center element:
Thickness t=30 mm: about 40 % increase Thickness t=40 mm: about 55 % increase Thickness t=50 mm: about 70 % increase Advantages of the present invention The beam as described above is distinguished from prior art techniques and patented solutions by:
1. Allowing compact beams to be produced with desired pre-stressing without adhering/ gluing, ref. Figs. 2A-B.
2. Allowing use of new pre-stressed cross-sectional shapes, see, Figs. 2C and 3C.
3. The method is well suited for beams in floor elements of increased spans, see Figs. 4A-C.
4. The method provides possibility of improved utilization of the basic material, see calculation example.
Claims (7)
1. Pre-stressed compact beam of elastic material where two outer elements (10, 12) which are symmetrical or near symmetrical about the total cross-section's neutral axis, are joined in pre-stressed condition subsequent mutual sliding displacement of the elements, characterized in that the outer elements (10, 12) are held together by means of a shear transmitting center element (11) arranged for mechanical and/ or chemical transmission of force.
2. Pre-stressed compact beam as claimed in claim 1, characterized in that the center element (11) is made in same material as the outer elements (10, 12) or in a material with a higher shear capacity.
3. Pre-stressed compact beam as claimed in claim 1, characterized in that at maximum degree of pre-stress, a substantially plastic distribution of the stress is obtainable over the cross-section.
4. . Pre-stressed compact beam as claimed in claim 1, characterized in that mechanical transformation of forces are obtained by providing adjacent surfaces of the center element (11) and the outer elements (10, 12) with three-dimensional structures which are arranged to come into tight-fitting mutual interaction only when the elements are inflicted with a certain pre-stressing force to thereby mutually adhere the elements together in a curved condition.
5. Pre-stressed compact beam as claimed in claim 1, characterized in that chemical transmission of forces between the center element (11) and the outer elements (10, 12) is accomplished by gluing the elements (10-12) together.
6. Method for the manufacture of pre-stressed, compact beam of elastic material comprising two outer elements (10, 12) which are symmetrical or near symmetrical along their neutral axis and which are joined in a curved condition, characterized in that shear transmitting, center element (11) is arranged between the two outer elements (10, 12) whereafter an elastic bending deformation is applied to the elements, implying a mutual sliding of the elements (10.12) before they are mechanically or chemically joined and thereafter unloaded.
7. Method as claimed in claim 6, characterized in that the elements' (10-12) contacting surfaces are mechanically or chemically joined at a certain degree of bending, e.g. by means of a surface structure, pressing. Gluing, bolting, or a combination of said means.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20101351A NO337441B1 (en) | 2010-09-29 | 2010-09-29 | Beamed beams of solid cross-section and method of making such beam. |
| NO20101351 | 2010-09-29 | ||
| PCT/NO2011/000262 WO2012044173A1 (en) | 2010-09-29 | 2011-09-20 | Pre-stressed compact beam and method for its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2812497A1 true CA2812497A1 (en) | 2012-04-05 |
| CA2812497C CA2812497C (en) | 2018-06-19 |
Family
ID=45893403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2812497A Active CA2812497C (en) | 2010-09-29 | 2011-09-20 | Pre-stressed compact beam and method for its manufacture |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2622147B1 (en) |
| CA (1) | CA2812497C (en) |
| NO (1) | NO337441B1 (en) |
| WO (1) | WO2012044173A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8820033B2 (en) * | 2010-03-19 | 2014-09-02 | Weihong Yang | Steel and wood composite structure with metal jacket wood studs and rods |
| EP2960391A1 (en) * | 2014-06-27 | 2015-12-30 | Servizi Generali S.r.l. | A prefabricated modular unit for the construction of buildings |
| NO345479B1 (en) * | 2018-08-27 | 2021-02-22 | Arne Vaslag | Composite, cooperating and elongated building element, and method for manufacturing such a building element. |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2039398A (en) * | 1934-10-11 | 1936-05-05 | Edward R Dye | Prestressed beam and method of manufacture |
| DD26379A1 (en) * | 1959-02-20 | 1964-04-15 | Bending stressed prestressed solid wall beams for building materials with the same tensile and compressive strength | |
| BE748846A (en) * | 1969-04-24 | 1970-09-16 | Lindal Skuli W | PRE-STRESSED WOODEN BEAM, HORIZONTAL LAYERS, WOODEN AND METAL LAYERS, AND METHOD FOR ITS |
| FR2192229A1 (en) | 1972-07-17 | 1974-02-08 | Wendel Sidelor | |
| NL8401393A (en) * | 1984-05-02 | 1985-12-02 | Houthandel V H T C Groot B V | METHOD AND APPARATUS FOR MANUFACTURING A COMPOSITE PRESELVED WOODEN BEAM |
| NO162124C (en) | 1984-06-22 | 1989-11-08 | Arne Engebretsen | TREATED BENCH OF WOODWOOD. |
| US4745718A (en) * | 1986-05-30 | 1988-05-24 | Trus Joist Corporation | Prestressed structural support and method for making same |
| CH663980A5 (en) * | 1987-03-25 | 1988-01-29 | Naef Ag Geb | Wooden plank to form member of load-bearing floor - consists of superimposed boards, rigidly connected by adhesive, pref. with convex set against load |
| US4754718A (en) | 1987-06-16 | 1988-07-05 | Tuftco Corporation | Double needle bar tufting apparatus for the formation of loop pile and cut pile |
| AU6291298A (en) * | 1997-03-07 | 1998-09-29 | Jurgen Ebbe Illner Breuning | An elongated structural wooden member |
| WO2000009830A1 (en) * | 1998-08-13 | 2000-02-24 | Markus Lehmann | Method for producing a fibre-reinforced laminate, especially a wood laminate, and said wood laminate |
| CH699945A2 (en) * | 2008-11-17 | 2010-05-31 | Josef Scherer | Preloaded Schichtbrettholz- or finger-jointed timber carrier |
-
2010
- 2010-09-29 NO NO20101351A patent/NO337441B1/en unknown
-
2011
- 2011-09-20 EP EP11829648.2A patent/EP2622147B1/en active Active
- 2011-09-20 WO PCT/NO2011/000262 patent/WO2012044173A1/en active Application Filing
- 2011-09-20 CA CA2812497A patent/CA2812497C/en active Active
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| Publication number | Publication date |
|---|---|
| NO337441B1 (en) | 2016-04-11 |
| EP2622147B1 (en) | 2016-07-13 |
| NO20101351A1 (en) | 2012-03-30 |
| WO2012044173A1 (en) | 2012-04-05 |
| EP2622147A1 (en) | 2013-08-07 |
| EP2622147A4 (en) | 2014-10-22 |
| CA2812497C (en) | 2018-06-19 |
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