GB1603357A - Creation of Inventions and Patents with Artificial Intelligence

GB1603357A – Wooden support structure with adhesive joints
– Google Patents

GB1603357A – Wooden support structure with adhesive joints
– Google Patents
Wooden support structure with adhesive joints

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Publication number
GB1603357A

GB1603357A
GB1837578A
GB1837578A
GB1603357A
GB 1603357 A
GB1603357 A
GB 1603357A
GB 1837578 A
GB1837578 A
GB 1837578A
GB 1837578 A
GB1837578 A
GB 1837578A
GB 1603357 A
GB1603357 A
GB 1603357A
Authority
GB
United Kingdom
Prior art keywords
support structure
wooden support
beams
joints
adhesive joints
Prior art date
1978-05-09
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.)

Expired

Application number
GB1837578A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

PURONTAKANEN P

Original Assignee
PURONTAKANEN P
Priority date (The priority date 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 date listed.)
1978-05-09
Filing date
1978-05-09
Publication date
1981-11-25

1978-05-09
Application filed by PURONTAKANEN P
filed
Critical
PURONTAKANEN P

1978-05-09
Priority to GB1837578A
priority
Critical
patent/GB1603357A/en

1981-11-25
Publication of GB1603357A
publication
Critical
patent/GB1603357A/en

Status
Expired
legal-status
Critical
Current

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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

E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members

E04C3/16—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with apertured web, e.g. trusses

Description

(54) WOODEN SUPPORT STRUCTURE WITH ADHESIVE JOINTS (71) I, PENTTI TEODOR PURON
TAKANEN of Aleksi 26 B, 33100 Tampere 10, Finland, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:
The invention concerns wooden support structures having adhesive joints.
Truss supports are manufactured by various methods, e. g. by nailing or using nail plate connection. This type of structure is quite light and statically very firm and steady and, in addition, the structure is quickly installable. Thus, it is naturally quite generally used. However, there are some considerable drawbacks to said structure, one of them being that, since the joint is generally the critical factor, the size of timber must be unnecessarily increased due to the surface area required by nailing, which naturally increases both weight and price of the structure. Moreover, under prolonged loads, the changes occurring in structures provided with such joints are permanent since loading of the beam and varying moisture conditions deform the joints and deflect the structures permanently.
The fast development over the past few years concerning adhesives and glueing methods has produced new prospects for the adaptations of various structures.
In order accurately to utilize physical and static properties of wood, there have been attempts to develop a method which makes it possible to cross-glue beams of timber in the angles required by constructional con siderations. According to the Technical
Research Centre of Finland, the tests performed in 1955 on the durability of an angle joint glued from saw timber indicated that, as early as after a couple of years, with the support subjected to weather changes, the joints glued in the angle exceeding 15 had such splits and losses of strength that glueing in angles exceeding 15 for any longer period of time is definitely out of the question. According to the research, the effect of wood deformations, in the angles exceeding that critical 15 , produced such stresses on the joint that the physical properties of wood were not sufficient to withstand them.
According to the present invention there is proposed a wooden support structure comprising lower and upper beams and diagonals extending therebetween, the lower and upper beams each being defined by respective spaced pairs of boards, planks or like elements to receive a diagonal therebetween, an intermediate layer of plywood board being interposed between adjacent opposing surfaces of the beams and diagonals in closely fitting relationship thereto and being glued to such surfaces.
The glueing of a piece of plywood in the joints on either side of the diagonal changes decisively the behaviour of the forces exerted on the joints. It is well-known in the art that deformation of plywood in varying moisture conditions are practically nil as compared to wood. Thus, with the deforma- tion decisively reduced, the stresses exerted on the joint will not be critical. Statically, plywood quite well fulfils the requirements set for an adhesive joint.
In the researches carried out in the wood board laboratory of the Technical Research
Centre of Finland, the basic idea has been found sound and correct as said structure was accepted in so-called delamination tests by which tests moisture condition changes over several years were examined and no openings of the adhesive joint occurred. In addition to the above, the TRC has performed the static tests according to the standard regulations for wood constructions.
These tests indicate that the security required by the standards for both the moment and cut-out was fully attained.
Thus, the present structure meets all requirements set therefor. Moreover, the basic idea can be perfectly well realized in practice the following critical advantages being thus gained:
-deflections under normal loads are only slight and completely restored when the loading is over,
-co-operation of the joints provides the structure with decisively greater strength as compared to prior art methods, -manufacturing method is simple and renders quality control absolutely reliable, -the method is economical since decisive factors in measuring operation will be forces in the beams instead of the joint itself as has been the case so far as a result of the nailing operation. The price of the support will go down at least 10% as compared to the prior art elements.
Figs. 1 and 2 of the accompanying drawings show the support in side view and figs. 3 and 4 in section. Both upper and lower beam, indicated as 1, consist of two adjacent boards, planks of the like elements, the ends of the diagonals 2 being mounted therebetween. These wood elements have not, however, been glued directly together but there are plywood elements 3 in the joint portions as intermediate layers. Thus, even under moisture changes, there is obtained a solid adhesive joint 4, although the fibres of saw timber (boards, planks and like elements) are not parallel but, on the contrary, may be far from it, as the case necessarily is in diagonal structures.
The advantages gained by plywood probably result from the thinness of its veneers.

Claims (2)

WHAT I CLAIM IS:

1. A wooden support structure comprising lower and upper beams and diagonals extending therebetween, the lower and upper beams each being defined by respective spaced pairs of boards, planks or like elements to receive a diagonal therebetween, an intermediate layer of plywood board being interposed between adjacent opposing surfaces of the beams and diagonals in closely fitting relationship thereto and being glued to such surfaces.

2. A support structure substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
. r.

GB1837578A
1978-05-09
1978-05-09
Wooden support structure with adhesive joints

Expired

GB1603357A
(en)

Priority Applications (1)

Application Number
Priority Date
Filing Date
Title

GB1837578A

GB1603357A
(en)

1978-05-09
1978-05-09
Wooden support structure with adhesive joints

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

GB1837578A

GB1603357A
(en)

1978-05-09
1978-05-09
Wooden support structure with adhesive joints

Publications (1)

Publication Number
Publication Date

GB1603357A
true

GB1603357A
(en)

1981-11-25

Family
ID=10111394
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB1837578A
Expired

GB1603357A
(en)

1978-05-09
1978-05-09
Wooden support structure with adhesive joints

Country Status (1)

Country
Link

GB
(1)

GB1603357A
(en)

Cited By (2)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB2239467A
(en)

1989-12-22
1991-07-03
Conder Group Plc
Roof or floor support.

FR2816649A1
(en)

2000-11-14
2002-05-17
Dorean
Wooden beam manufacturing method and frame made from beams comprises placing crosspieces on squares and fixing with adhesive

1978

1978-05-09
GB
GB1837578A
patent/GB1603357A/en
not_active
Expired

Cited By (4)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB2239467A
(en)

1989-12-22
1991-07-03
Conder Group Plc
Roof or floor support.

GB2239467B
(en)

1989-12-22
1994-03-02
Conder Group Plc
Support structure

FR2816649A1
(en)

2000-11-14
2002-05-17
Dorean
Wooden beam manufacturing method and frame made from beams comprises placing crosspieces on squares and fixing with adhesive

US7185471B2
(en)

2000-11-14
2007-03-06
Dorean Sarl
Method for making a wooden beam, wooden beam and structure for constructing a building

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