Overbending correcting forming method for variable-section arc glue laminated wood member

A molding method and glued wood technology, applied in chemical instruments and methods, other plywood/plywood appliances, wood processing appliances, etc., can solve the problems of unfavorable mechanical properties of components, the inability to effectively guarantee the quality of gluing, and large shape errors of curved components, etc. question

Active Publication Date: 2016-12-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the radius of curvature required for the preparation of arc-shaped glulam components is determined empirically. Often, the rebound degree of the components cannot be predicted or accurately calculated after the components are prepared. The shape error of the arc-shaped components is relatively large, which is not conducive to ensuring the mechanical properties of the components. During the process, problems such as failure to assemble normally
At the same time, the preparation method of variable-section arc-shaped glulam components is different from the production method of traditional decorative wood products, and also different from the product

Method used

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  • Overbending correcting forming method for variable-section arc glue laminated wood member
  • Overbending correcting forming method for variable-section arc glue laminated wood member
  • Overbending correcting forming method for variable-section arc glue laminated wood member

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The bending correction forming method of variable cross-section arc-shaped glulam members includes five processes of length fixing of wooden laminates, adhesive coating, profiling of wooden laminates, pressurization and setting, and pressure relief maintenance. The five processes are all performed at a temperature of It is completed under the environmental conditions of 18°C ​​and relative humidity of 60%.

[0032] For moisture content and air-dry density of 8% and 0.45g / cm 3 The design radius of curvature of the arc-shaped glulam member with variable cross-section is 5500mm, the span at the arc is 3.0m, the thickness of the thickest section of the variable-section arc-shaped glulam member is 350mm, and the number of laminates at the thickest section is 9 layers, each with a thickness of 38.8 mm, through the method of springback deformation compensation, the radius of curvature for the preparation of variable-section arc-shaped glulam members is determined as:

[0033]...

Embodiment 2

[0040] The bending correction molding method of variable cross-section arc-shaped glulam members, the steps are the same as in Example 1, including five processes of wood laminate length fixing, adhesive coating, wooden laminate profiling, pressure setting and pressure relief maintenance. Each process is completed under the environmental conditions that the temperature is 28° C. and the relative humidity is 65%.

[0041] For moisture content and air-dry density of 10% and 0.50g / cm 3 The design radius of curvature of the curved glulam member with variable cross-section is 4000mm, the span at the arc is 4.0m, the thickness of the thickest part of the cross-section curved glulam member is 400mm, and the number of laminates at the thickest part is 11 layers, each with a thickness of 36.3 mm, through the method of springback deformation compensation, the curvature radius of the curved glulam member with variable cross-section is determined as:

[0042] The radius of curvature of t...

Embodiment 3

[0046] The bending correction molding method of variable cross-section arc-shaped glulam members, the steps are the same as in Example 1, including five processes of wood laminate length fixing, adhesive coating, wooden laminate profiling, pressure setting and pressure relief maintenance. Each process is completed under the environmental conditions that the temperature is 25° C. and the relative humidity is 85%.

[0047] For moisture content and air-dry density of 12% and 0.60g / cm 3 The design radius of curvature of the curved glulam member with variable cross-section is 6000mm, the span at the arc is 5.8m, the thickness of the thickest part of the cross-section curved glulam member is 600mm, and the number of laminates at the thickest part is 17 layers, the thickness of each layer is 35.2 mm, and the radius of curvature of the curved glulam member with variable cross-section is determined by means of springback deformation compensation:

[0048] The radius of curvature of th...

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Abstract

The invention discloses an overbending correcting forming method for a variable-section arc glue laminated wood member and belongs to the field of preparing of glue laminated wood. The method includes the steps including five processes of wood laminate length fixing, adhesive coating, wood laminate profiling modeling, pressurizing sizing and member deep machining; the preparing curvature radius of the variable-section arc glue laminated wood member is determined and the appearance of the variable-section arc glue laminated wood member is ensured according to the number of wood laminates and the design curvature radius of the variable-section arc glue laminated wood member; and the gluing quality of the glue laminated wood member is ensured by setting the minimum pressurizing distance of a distribution type pressing machine. According to the method, the problem that the preparing curvature radius of the variable-section arc glue laminated wood member and the minimum pressurizing distance during multi-point pressurizing are determined only through experience is solved according to the number of the wood laminates and the design curvature radius of the glue laminated wood member and by setting the minimum pressurizing distance of the distribution type pressing machine, the phenomenon that shape rebounding caused after gluing pressure forming of the variable-section arc glue laminated wood member cannot be predicted traditionally is avoided, and the gluing quality of the variable-section glue laminated wood is ensured.

Description

technical field [0001] This patent relates to the preparation of glulam, in particular to a bending correction molding method for arc-shaped glulam members with variable cross-sections. Background technique [0002] Compared with steel structures, the materials used in glulam structures are environmentally friendly, energy-saving, and renewable; compared with reinforced concrete structures, in addition to being environmentally friendly and energy-saving, the main structural components of glulam structures can also be prefabricated in factories to achieve rapid assembly on the construction site. Avoid on-site wet work; compared with traditional log structures, glulam components are formed by finger-jointing lengths, transverse widths, and thickness superimpositions. The unit size of the components is small, so it can be designed and processed into any shape. And the size is not limited. [0003] However, at present, in the processing of curved glulam components with variable...

Claims

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Application Information

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IPC IPC(8): B27D1/08B27D5/00B32B37/10B32B37/12
CPCB27D1/08B27D5/00B32B37/10B32B37/12
Inventor 岳孔刘伟庆陆伟东程秀才贾翀汤丽娟
Owner NANJING UNIV OF TECH
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