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
  • E04C3/14—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 glued glulam beam with outer cover boards made of solid wood.
• the invention has for its object to provide a glued glulam beam with outer cover boards made of solid wood, and a method for its production, the strength of which is not subject to fluctuations due to irregularities in the glued individual components.
• the chipboard strips stand upright with respect to the solid wood cover boards.
• a glued glulam beam is also proposed, which optionally has an outer cover board made of solid wood on the side of the beam that is subjected to tension, which is characterized in that it has glued chipboard strips of high-strength quality.
• a glued glulam beam with a cover element applied to the tensile side of the girder is proposed, which is characterized in that the glulam beam has chipboard strips of high-strength quality that are glued together and that 1 to 4 layers of boards, plywood or other are used as the cover element flat wood material, e.g. a material commercially available under the trade name Kertopuu @ or long-to-long glued plywood material can be used.
• the process for producing the glued glulam beams of the above type is characterized in that chipboard strips are glued flat to one another in the cold process or with high-frequency heating, the block of glued chipboard strips is trimmed in parallel and glued between outer cover sheets made of solid wood, or a cover board or cover element is glued on.
• the chipboard used to manufacture the glued glulam beam according to the invention can be produced as follows:
• the shavings of the top and middle layers of the chipboard consist for example of two thirds of oak wood and one third of softwood, preferably spruce or fir.
• the chip thickness is between 0.3 and 0.6 mm.
• the proportion of fine dust in the middle class should be less than 10%.
• a melamine-urea-phenol-formaldehyde resin is preferably used as the glue, as described, for example, in DE-C-20 20 481 or DE-C-29 51 957.
• the solid resin dosage, based on absolutely dry chips should be 13.0 to 15.0% by weight for the top layer and 11.0 to 13.0% by weight for the middle layer.
• the Solid wax dosage based on absolutely dry chips should be 0.8 to 1.0% by weight for the top layer and 0.6 to 0.8% by weight for the middle layer.
• the hardener used is preferably a dicarboxylic acid mixture (for example type 15 hardener in scale form from BASF Aktiengesellschaft) or a formaldehyde-binding hardener according to DE-A-34 00 669.
• the chips In the poured chip cake, the chips should have a moisture content of approximately 9 to 11% by weight of the middle layer and 12 to 15% by weight in the cover layer.
• the hydraulic press should allow a specific pressing pressure of 3.0 to 4.0 N / mm 2 so that the press can be run on spacer bars within 10 to 15% of the total pressing time despite the high density of the plates. Under these conditions, chipboard can be produced which corresponds to the characteristics mentioned at the outset and, as high-strength chipboard, is a requirement for the glued glulam beams according to the invention.
• a laminated timber carrier of the invention for example, has a cross-section of 50 "15.4 cm, one goes, for example, as follows: There are chipboard described high-strength quality having a thickness of 22 mm into strips of 38 cm width cut. Seven pieces of these chipboard strips of any length are glued flat to one another with an approved wood-glue construction glue, preferably a melamine-urea-phenoi-formaidehyde resin according to DE-A-20 43 440 using the cold process or with high-frequency heating. The block of glued panels is trimmed parallel to a width of 36.8 cm. If there is no precision saw, calibration with a wide belt sander is recommended.
• the block is then glued upright between 3 spruce boards each 22 mm thick with the aforementioned glues. In this way, a support of 50 cm in height is obtained, which is much cheaper to manufacture due to the replacement of 16 to 17 board layers of 22 mm by the high-strength chipboard.

Applications Claiming Priority (2)

Publications (2)

Family

ID=6271400

Family Applications (1)

Country Status (2)

Cited By (4)

Citations (6)

• 1985
  • 1985-05-23 DE DE19853518483 patent/DE3518483A1/de not_active Withdrawn
• 1986
  • 1986-05-15 EP EP86106636A patent/EP0202612A3/fr not_active Withdrawn

Patent Citations (6)

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