WO2002090684A1 - Formwork support - Google Patents
Formwork support Download PDFInfo
- Publication number
- WO2002090684A1 WO2002090684A1 PCT/EP2002/004526 EP0204526W WO02090684A1 WO 2002090684 A1 WO2002090684 A1 WO 2002090684A1 EP 0204526 W EP0204526 W EP 0204526W WO 02090684 A1 WO02090684 A1 WO 02090684A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- formwork
- cover layers
- web
- thickness
- wood
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
- E04G11/48—Supporting structures for shutterings or frames for floors or roofs
- E04G11/50—Girders, beams, or the like as supporting members for forms
-
- 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
- E04C3/14—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with substantially solid, i.e. unapertured, web
Definitions
- the invention relates to a formwork beam made of wood for concrete formwork according to the preamble of claim 1.
- formwork beams made of wood are widely used to support concrete formwork, which differ from conventional, so-called wooden construction beams in that they are dimensioned for a particularly high shear load capacity.
- formwork beams for concrete formwork have a comparatively compact structure with relatively large belts and a solid web.
- the web can be designed as a so-called lattice web, glulam, plywood, flat pressed board or a so-called three-layer web.
- the invention is concerned with the last-mentioned construction of a three-layer web.
- the central position of such a web is made from glued sawn timber.
- several short sections of a correspondingly cut board are arranged side by side and glued together. Due to this design of the web, drying or aging processes of the sawn timber used can result in cracks forming parallel to the grain.
- the grain direction of the cover layers usually runs in the longitudinal direction of the carrier, in other words perpendicular to the grain direction of the middle layer, so that the known barrier effect can be used advantageously at the interface between the middle layer and the respective cover layer, and the web receives the required load-bearing capacity.
- the cover layers must have a certain minimum thickness in order to offer the required load-bearing capacity of the web.
- This recognized opinion of the professional world can be verified by the following standards and their references, whereby it should be noted that these standards are currently published in the draft and are about to be adopted.
- prEN 1377 under point 5.2.2b that in the case of formwork girders made of wood, the girder web can consist of solid wood panels for the exterior according to prEN 13353.
- prEN 13353 which concerns the requirements for solid wood panels, points 4.5.2 and 4.5.3 differentiate between load-bearing and non-load-bearing purposes. Please refer to EN 13017-1 and EN 13017-2 for checking with regard to the surface, i.e. the cover layers.
- EN 13017-1 which was published as the final draft with the designation prEN 13017-1, concerns solid wood panels made of softwood.
- Point 4.1 stipulates that the top layers of panels must have a minimum thickness of 5 mm for load-bearing purposes. Since the web of a formwork girder is undoubtedly a "plate" that is intended for load-bearing purposes, the standard for the top layers of the web of a wooden formwork girder requires a minimum thickness of 5 mm.
- the cover layers used for the web have a thickness of at least about 6 mm in the approved products available on the market.
- Cover layers have a thickness that corresponds to the above-mentioned standards.
- a structure is proposed in which the web is made of one layer and consists of wood, the
- the load-bearing capacity and load-bearing capacity in the case of shear force must have a three-layer web with sufficiently thick cover layers.
- the Steidle company knows a formwork beam on the market as a pre-use object, which consists of profiled glulam.
- the carrier built up along its height from several layers of glulam, the grain of which runs in the longitudinal direction of the beam for the entire beam.
- the web area must be made extremely solid, which makes the beam very difficult.
- the invention has for its object to provide a formwork beam made of wood suitable for use in concrete formwork, which has a simplified structure, thus leads to economic advantages and meets the requirements.
- the new formwork beam is characterized by the fact that the cover layers each have a thickness of less than 5 mm.
- the cover layers each have a thickness of less than 5 mm.
- cover layer By reducing the thickness required for the cover layer, the invention leads to considerable simplifications or economic advantages.
- cover layer blanks are produced by drying sawn boards, planing them and gluing them into so-called "cover layer blanks". The cover layer blanks are then again cut into cover layers of the three-layer web by sawing. Due to the large number of work steps and the loss of wood due to the sawing and planing processes, the production of conventional cover layers is very complex.
- the cover layer with the smaller thickness according to the invention can be made, for example, from inexpensive veneers, which is produced by chipless peeling of the round logs.
- the cover layer from wood, but instead to provide only a layer of a suitable material which sufficiently prevents the aging and cracking of the middle layer, reduces inhomogeneities and thereby equalizes the shear strength, but otherwise has no or only an extremely small bearing effect.
- the invention therefore consists in providing a cover layer with a thickness of less than 5 mm, so that this merely ensures that no cracks form on the central layer, which would in some cases impermissibly reduce the load-bearing capacity of the web.
- Top layers are not load-bearing.
- the central layer of the web alone also has the required load-bearing capacity
- the cover layers are preferably designed in such a way that they have no or only an extremely low load-bearing function.
- Figure 1 shows a cross section through part of the formwork beam according to the invention.
- Fig. 2 shows a cross section through part of a conventional formwork beam.
- the formwork support 10 consists of a web 12, an upper chord 14 and a lower chord, which cannot be seen in FIG. 1.
- the fiber direction of the belts extends in the longitudinal direction of the carrier 10, in other words perpendicular to the plane of the drawing in FIG. 1.
- the web 12, which consists of three layers, is connected to the two belts 14 via a finger joint, which is only formed in the area of the middle layer 16 connected.
- the fiber direction of the middle layer 16 extends perpendicular to the longitudinal direction of the carrier, ie from top to bottom according to FIG. 1. > ⁇ K ) MHH
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50213236T DE50213236D1 (en) | 2001-05-03 | 2002-04-24 | FORMWORK BEAMS |
EP02735296A EP1383972B1 (en) | 2001-05-03 | 2002-04-24 | Formwork support |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10121522.3 | 2001-05-03 | ||
DE10121522A DE10121522C1 (en) | 2001-05-03 | 2001-05-03 | formwork beams |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002090684A1 true WO2002090684A1 (en) | 2002-11-14 |
Family
ID=7683494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/004526 WO2002090684A1 (en) | 2001-05-03 | 2002-04-24 | Formwork support |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1383972B1 (en) |
AT (1) | ATE421622T1 (en) |
DE (2) | DE10121522C1 (en) |
WO (1) | WO2002090684A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2230628A (en) * | 1937-10-18 | 1941-02-04 | Christoph & Unmack Ag | Wooden girder |
DE2334524A1 (en) | 1972-07-24 | 1974-02-07 | Palico Ag | WOODEN BEAM WITH GLUED TINE JOINT BETWEEN BELT AND BAR, PROCESS FOR ITS MANUFACTURING AND EQUIPMENT FOR EXECUTING THE PROCESS |
US4413459A (en) * | 1981-03-16 | 1983-11-08 | Boise Cascade Corporation | Laminated wooden structural assembly |
DE4237173A1 (en) | 1992-11-04 | 1994-05-05 | Peri Bv | Wooden belt carrier with full wall web |
US5443894A (en) * | 1994-07-29 | 1995-08-22 | Ucar Carbon Technology Corporation | Fire retardant oriented strand board structure element |
WO1995030808A1 (en) * | 1994-05-05 | 1995-11-16 | William John Bernard Ollis | Building elements |
DE29717759U1 (en) | 1996-11-07 | 1998-02-05 | Doka Industrie Ges.M.B.H, Amstetten | Beam made of wood |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE624855C (en) * | 1933-03-29 | 1936-01-29 | Charles Holst | Profile supports or similar objects made of plywood |
-
2001
- 2001-05-03 DE DE10121522A patent/DE10121522C1/en not_active Revoked
-
2002
- 2002-04-24 DE DE50213236T patent/DE50213236D1/en not_active Expired - Lifetime
- 2002-04-24 AT AT02735296T patent/ATE421622T1/en active
- 2002-04-24 WO PCT/EP2002/004526 patent/WO2002090684A1/en not_active Application Discontinuation
- 2002-04-24 EP EP02735296A patent/EP1383972B1/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2230628A (en) * | 1937-10-18 | 1941-02-04 | Christoph & Unmack Ag | Wooden girder |
DE2334524A1 (en) | 1972-07-24 | 1974-02-07 | Palico Ag | WOODEN BEAM WITH GLUED TINE JOINT BETWEEN BELT AND BAR, PROCESS FOR ITS MANUFACTURING AND EQUIPMENT FOR EXECUTING THE PROCESS |
US4413459A (en) * | 1981-03-16 | 1983-11-08 | Boise Cascade Corporation | Laminated wooden structural assembly |
DE4237173A1 (en) | 1992-11-04 | 1994-05-05 | Peri Bv | Wooden belt carrier with full wall web |
WO1995030808A1 (en) * | 1994-05-05 | 1995-11-16 | William John Bernard Ollis | Building elements |
US5443894A (en) * | 1994-07-29 | 1995-08-22 | Ucar Carbon Technology Corporation | Fire retardant oriented strand board structure element |
DE29717759U1 (en) | 1996-11-07 | 1998-02-05 | Doka Industrie Ges.M.B.H, Amstetten | Beam made of wood |
Also Published As
Publication number | Publication date |
---|---|
EP1383972B1 (en) | 2009-01-21 |
DE10121522C1 (en) | 2002-10-31 |
ATE421622T1 (en) | 2009-02-15 |
EP1383972A1 (en) | 2004-01-28 |
DE50213236D1 (en) | 2009-03-12 |
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