EP0076812A1 - Dispositif d'amelioration de la resistance a la flexion de poutres en bois - Google Patents
Dispositif d'amelioration de la resistance a la flexion de poutres en boisInfo
- Publication number
- EP0076812A1 EP0076812A1 EP19820901102 EP82901102A EP0076812A1 EP 0076812 A1 EP0076812 A1 EP 0076812A1 EP 19820901102 EP19820901102 EP 19820901102 EP 82901102 A EP82901102 A EP 82901102A EP 0076812 A1 EP0076812 A1 EP 0076812A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable
- hand
- beams
- cables
- support
- 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- Withdrawn
Links
- 239000002023 wood Substances 0.000 title description 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 230000002787 reinforcement Effects 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 239000011122 softwood Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 235000014081 Abies amabilis Nutrition 0.000 description 1
- 240000001416 Pseudotsuga menziesii Species 0.000 description 1
- 235000008572 Pseudotsuga menziesii Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 244000045947 parasite Species 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
- E04C3/292—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being wood and metal
-
- 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
- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
-
- 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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- 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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0248—Increasing or restoring the load-bearing capacity of building construction elements of elements made of wood
Definitions
- Modern constructions like those of yesteryear, often use wooden structures using planks, beams, beams. These elements are assembled to form a frame which is subjected to a set of static forces, assumed to be invariable, the result of which is vertical and directed downwards and passes through the center of gravity of the structure. Aging, bad weather, the weight of snow in the cold season, are elements that often have an influence such that the construction becomes fragile and that it is sometimes essential to consider strengthening or even replacing it.
- These phenomena of weakening of a wooden structure are, today, much more frequent than formerly: the forest which the modern man exploits is made of less deciduous trees and the coniferous species which populate it are cut in any season , saturated with resins that accelerated drying methods do not sufficiently remove fibers.
- the young woods proposed to serve as beams are highly elastic and efforts have been made to improve their resistance to bending. It is well known to reinforce a wooden structure by propping it by resting on the nearest flat surface (generally the attic). This obviously has major disadvantages (possible sagging of the support surface). Apart from an improvement in drying techniques and shoring, no particular technique can strengthen the planks. The strongest beams are laminated and are known.
- the essential idea of the invention is the use of steel cables, the tension of which is adjusted so as to increase the static resistance characteristics of a beam.
- FIG. 1 An embodiment of the invention is visible in Figure 1 in which there is shown a beam modified according to the method mentioned above: a cable follows, along the beam, the path with groove, from the mark 1 to mark 5.
- the beam placed horizontally has its upper extreme angles cut at 45 ° and 135 °. Perpendicular to the surfaces thus made, a hole is drilled from 5 to 4 and from 1 to 2 respectively.
- the lower part 2, 3, 4 of the beam is grooved in the middle 8.
- Three plates 6 serve to fix and hold the cable in place. Each plate is screwed diagonally.
- two tensioning devices 11 are provided (blocking cone 11 and plates 10) which put the cable under tension.
- the same beam, statically modified and in the pre-tensioned state, according to the invention, has an arrow of 11 mm under 500 kgs . only and the breaking limit is raised to 1760 kgs. (without collapse).
- the same idea of reinforcement by metal cable is the basis of a second embodiment according to the invention and illustrated in FIG. 2.
- the wooden beam 9 (resting on the walls 14) has two fixing ends 1 and 6 , in general rafters of the roof.
- a metallic hand is moreover capable of sliding along the beam while conforming to its shape.
- the metal hand 8 is provided with a support 10 to which it is welded.
- the base of the support is connected on the left to a cable going from the fixing 4 towards the cable clamp 5 by encircling the beam at 6. Similarly symmetrically, the right cable follows the path 3, 2, 1. (2 designated the greenhouse -right cable).
- the references 11 and 12 designate cable tensioners (with left and right screw threads).
- the reinforcement of the wooden beam 9 using the support according to the invention is therefore easily conceivable.
- the metal hand is fixed vertically to the center of gravity of the assembly constituted by the beam to be reinforced and by its load. In practice, for reasons of symmetry, the metal hand is placed in the center of the beam. For exceptional cases where the distribution is not symmetrical, the graphostatic methods make it possible to determine the location of the metallic hand.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Composite Materials (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE5/5229A BE888356A (fr) | 1981-04-09 | 1981-04-09 | Poutrelle en bois precontrainte |
| BE5005229 | 1981-04-09 | ||
| BE5/5228A BE888355A (fr) | 1981-04-09 | 1981-04-09 | Support de charpente, |
| BE5005228 | 1981-04-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0076812A1 true EP0076812A1 (fr) | 1983-04-20 |
Family
ID=25662038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19820901102 Withdrawn EP0076812A1 (fr) | 1981-04-09 | 1982-04-07 | Dispositif d'amelioration de la resistance a la flexion de poutres en bois |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0076812A1 (fr) |
| AU (1) | AU8336182A (fr) |
| WO (1) | WO1982003647A1 (fr) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8332533D0 (en) * | 1983-12-06 | 1984-01-11 | Dinardo & Partners | Restoration and strengthening of timber components |
| FR2585393B1 (fr) * | 1985-07-29 | 1988-03-25 | Renofors France | Poutre ou autre element de construction en bois renforce au moyen d'une armature, et procede pour sa realisation |
| FR2627210A1 (fr) * | 1988-02-11 | 1989-08-18 | Antignac Paul | Joint de continuite precontraint pour poutres en bois lamelle-colle |
| DE4242525C2 (de) * | 1992-12-16 | 1995-09-28 | Jurck Hans Henrich | Mehrteiliges Bauelement als Träger von Gebäudedachflächen, insbesondere für hallenartige Bauten |
| US8820033B2 (en) * | 2010-03-19 | 2014-09-02 | Weihong Yang | Steel and wood composite structure with metal jacket wood studs and rods |
| RU2512147C2 (ru) * | 2012-08-07 | 2014-04-10 | Александр Григорьевич Леонтьев | Шпренгельная балка |
| FR3012497B1 (fr) * | 2013-10-30 | 2015-12-11 | Lefevre M | Procede de renforcement d'un element de construction en bois par assemblage d'un module de renfort mis en post-tension |
| RU2718572C2 (ru) * | 2017-10-27 | 2020-04-08 | Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования "Дагестанский Государственный Технический Университет" (Дгту) | Армированная дощатоклееная балка |
| IT202000000640A1 (it) * | 2020-01-16 | 2021-07-16 | Arsenio Borgnini | Sistema di tensionamento salva capriata |
| IT202300019413A1 (it) * | 2023-09-21 | 2025-03-21 | Setten Genesio Holding S P A | Metodo per la ristrutturazione di un solaio |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2601910A (en) * | 1944-05-16 | 1952-07-01 | Thomas F Nichols | Composite structural member |
| CH255339A (de) * | 1945-11-03 | 1948-06-30 | Muther Adolf | Vorgespannter Holzbalken. |
| US2856644A (en) * | 1955-07-05 | 1958-10-21 | Royal J Ahlberg | Joist brace |
| US3251162A (en) * | 1962-01-25 | 1966-05-17 | Pierce J Strimple | Laminated prestressed beam construction |
| BE888356A (fr) * | 1981-04-09 | 1981-07-31 | Wilgaut H | Poutrelle en bois precontrainte |
| BE888355A (fr) * | 1981-04-09 | 1981-07-31 | Wilgaut H | Support de charpente, |
-
1982
- 1982-04-07 AU AU83361/82A patent/AU8336182A/en not_active Abandoned
- 1982-04-07 WO PCT/BE1982/000006 patent/WO1982003647A1/fr not_active Ceased
- 1982-04-07 EP EP19820901102 patent/EP0076812A1/fr not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8203647A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1982003647A1 (fr) | 1982-10-28 |
| AU8336182A (en) | 1982-11-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB LI LU NL SE |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: WILGGAUT, HENRIETTE Owner name: ZAK, TELESPHORE Owner name: ZAK, THIERRY Owner name: ZAK, FRANCOIS |
|
| 17P | Request for examination filed |
Effective date: 19830811 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19830311 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ZAK, TELESPHORE |