Pre-Pressed Timber Board Assembly for Glue-Free Seismic Strength
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Solution Overview
Problem
Existing timber construction systems face challenges in effectively transmitting and absorbing forces between wooden structural boards, particularly due to the ecological drawbacks of glue and the limitations of non-glue holding systems in providing sufficient mechanical strength and resistance to seismic stresses.
Innovation Solution
A construction element with pre-pressed grooved patterns and a holding system featuring metal threaded rods passing through the boards, which enhances the precision and cooperation of the patterns, improves force transmission, and provides high resistance to pulling away, thereby increasing mechanical strength without the need for glue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glue is used as a holding system at the contact interface, then the boards are held together effectively, but the ecological impact is detrimental and seismic resistance is reduced due to lack of plasticity
Solution Approach 1:
The patent removes glue from the holding system and replaces it with mechanical interlocking elements (metal connectors, wooden pegs, or dowels) that pass through the grooved patterns. This extraction eliminates the harmful ecological impact and improves seismic resistance by allowing plastic deformation and energy absorption through the mechanical elements rather than brittle glue bonds.
Solution Approach 2:
The patent introduces metal connectors, wooden pegs, or dowels as intermediary elements between the grooved patterns of adjacent boards. These intermediaries provide the holding function while enabling mechanical interlocking that resists pulling forces and allows for plasticity during seismic events, replacing the problematic glue intermediary.
2Object-affected harmful factors
If non-glue holding systems like pins, rings, or spikes are used, then ecological impact is reduced, but resistance to pulling away is insufficient due to natural sliding of grooved patterns
Solution Approach 1:
The patent applies preliminary compression force to the assembly before the holding elements are fully engaged, pre-pressing the grooved patterns together. This preliminary action reduces the initial sliding tendency and ensures better engagement of the mechanical holding elements, thereby improving resistance to pulling away while maintaining ecological benefits of glue-free construction.
3Stability of the object's composition
If grooved patterns are used to prevent sliding, then locking in the plane is improved, but spaces remain between boards at the contact interface reducing force absorption by friction
Solution Approach 1:
The patent introduces mechanical holding elements (metal connectors, wooden pegs, or dowels) as intermediaries that fill and engage with the spaces between grooved patterns at the contact interface. These elements eliminate the gaps that reduce friction-based force absorption while maintaining the locking stability provided by the grooved patterns, allowing effective force transmission through mechanical interlocking.
4Strength
If bolts are used as holding system members, then resistance to pulling away is improved, but industrial production is hindered due to preliminary piercing and nut space requirements
Solution Approach 1:
The patent extracts the nut component from the bolt assembly and replaces it with self-contained mechanical holding elements (such as self-tapping screws, expansion anchors, or integrated wooden pegs) that achieve secure fixation without requiring separate nuts or preliminary piercing operations. This simplification enables faster, more efficient industrial production while maintaining high resistance to pulling forces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the mechanical strength and seismic resistance of timber construction elements by improving the fit and cooperation of grooved patterns, reducing the risk of splitting, and allowing for more precise assembly, while minimizing the use of glue and facilitating industrial production.
Implementation Method 1
The grooved patterns may be arranged so that the respective patterns of the faces of the boards in contact cooperate and form an obstacle to the sliding of these boards with respect to each other in the plane of their contact interface
Implementation Method 2
a force that is exerted along the axis orthogonal to the plane of the boards, as well as a shear force for designating a force that is exerted in the plane of the boards
Implementation Method 3
the holding system comprises at least one member with a metal threaded rod passing—at least partially—through at least two of the wooden structural boards at the contact interface
Data Source
AI summary
A construction element includes superposed wooden structural boards that are provided with grooved patterns at the contact interface between the boards in order to prevent the first board and the second board from sliding relative to each other along at least one axis. The construction element further includes a retention system for retaining the boards against each other at the contact interface. The grooved patterns are pre-pressed against each other and the retention system includes at least one metal threaded rod component at least partially passing through at least two of the wooden structural boards at the contact interface.