Cooperative Robotic Fabrication of Timber Dowel Assemblies

Thoma, Andreas; David, Jairo; Helmreich, Matthias; Gandia, Augusto; Gramazio, Fabio; Köhler, Matthias

doi:10.1515/9783035620238-008

Cited by 9 publications

(7 citation statements)

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“…While industrial robots provide a cheaper alternative to computer numerical control (CNC) milling (especially five-axis milling) and potentially an increase in the size of the processed component, they come with limitations in terms of metric precision, applicable force, and dimensional reach. However, when combined with robotic assembly, the use of the robot overcomes the need to reposition and reprocess the working piece, which may also decrease tolerances and allow for more design possibilities (20). Applications of subtractive robotic processes range from cutting and sawing (21)(22)(23)(24), milling (25)(26)(27), and drilling (20) to carving (28).…”

Section: Construction Automationmentioning

confidence: 99%

“…However, when combined with robotic assembly, the use of the robot overcomes the need to reposition and reprocess the working piece, which may also decrease tolerances and allow for more design possibilities (20). Applications of subtractive robotic processes range from cutting and sawing (21)(22)(23)(24), milling (25)(26)(27), and drilling (20) to carving (28). Besides additive and subtractive processes, we can also delimit deformative processes, such as wire bending (29,30), metal sheet bending or folding (31,32), and incremental sheet forming (33).…”

Section: Construction Automationmentioning

confidence: 99%

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Construction Robotics: From Automation to Collaboration

Parascho

2023

Annu. Rev. Control Robot. Auton. Syst.

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Over the past decades, robotics has shown great potential to impact the built environment, from automation to differentiation and efficient construction. However, construction processes are highly complex and require tackling a multitude of problems, from safety and robustness to ease of control and interactivity. For this reason, the field of construction robotics is still evolving, requiring finding solutions for new challenges every day. The present review analyzes the role of robotics in construction and architecture over time and highlights current trends in shifting from pure automation toward collaborative and adaptive processes that have the potential to fully integrate robotics into a rigid and challenging industry, such as construction. Expected final online publication date for the Annual Review of Control, Robotics, and Autonomous Systems, Volume 14 is May 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Construction Automationmentioning

confidence: 99%

Section: Construction Automationmentioning

confidence: 99%

Construction Robotics: From Automation to Collaboration

Parascho

2023

Annu. Rev. Control Robot. Auton. Syst.

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“…The diameter of a wooden dowel changes opposite way, i.e., the dowel diameter decreases with decreasing ambient humidit same time as the hole gets larger, and this reduces the performance of the connectio use of densified wood as a "swelling" dowel in friction-locked joints has been sug as a way to overcome this long-term performance problem [15,20].The "swelling" an effect of the so-called set-recovery deformation that occurs in unmodified de wood. The greater "swelling" of densified wood compared to that of un-densified could also allow the use of dowels with a dowel diameter less than the pre-drille diameter, thereby facilitating the insertion of the dowel, especially in robotic fabr [21][22][23].…”

Section: Joining Multi-layer Timber With Wooden Dowelsmentioning

confidence: 99%

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Han

Kutnar

Sandak

et al. 2023

Forests

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Engineered wood products (EWPs) are being increasingly used as construction materials. EWPs are currently being made using synthetic adhesives or metal fasteners, which lead to poor recyclability and reusability. Therefore, this review paper focused on emerging adhesive- and metal-free assembling techniques including wood dowels, rotary-dowel welding, wooden nails, and dovetail joining as alternative ways of making prefabricated EWPs. This will contribute towards green construction and optimising the building process to minimise its negative impact on the environment and its inhabitants, while maximising the positive aspects of the finished structure. The respective advantages and shortcomings will be compared with those of equivalent EWPs. In general, the dowel-laminated timber (DLT) provides sufficient load-bearing capacity and even better ductility than EWPs of equivalent size, but its relatively low stiffness under a bending load limits its application as a structural element. Optimised manufacturing parameters such as dowel species, dowel spacing, dowel diameter, dowel insertion angle, dowel shape, etc. could be studied to improve the stiffness. The improved mechanical properties and tight fitting due to set-recovery of densified wood support its use as sustainable alternatives to hardwood dowels in DLT to overcome problems such as the loosening of connections over time and dimensional instability. The rotary welding technology could also enhance the strength and long-term performance of dowel-type joints, but its poor water resistance needs further investigation. The main obstacles to implementing DLT products in the market are missing technical information and design guidelines based on national codes.

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“…The DLT process typically involves the use of hardwood dowels positioned within drilled holes to form a tight fit connection between adjacent laminations as shown in Figure 1. The use of such technology has been successfully utilised to form DLT panels and beams using a variety of different timber species [1][2][3]. This technology ultimately reduces the use of adhesives in EWPs and further improves the environmental credentials.…”

Section: Introduction 56mentioning

confidence: 99%

Numerical Examination of the Behaviour of Dowel Laminated Timber Elements Utilising Compressed Wood Dowels

O’Ceallaigh

Harte

McGetrick

2023

World Conference on Timber Engineering (WCTE 2023)

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This study examines the use of finite element software to model the failure behaviour of a dowel laminated timber (DLT) beam which is connected with the use of modified or compressed wood dowels. The numerical model is validated against experimental results and a parametric study is carried out to further examine the influence of dowel diameter and dowel spacing on the load-displacement behaviour of the DLT beams. The numerical model is shown to accurately simulate the ultimate failure load and the stiffness of the DLT beams. The influence of dowel diameter and dowel spacing are presented. The results demonstrate that DLT technology can be used to further improve the environmental performance of timber construction by replacing the use of adhesive which is commonly used when manufacturing laminated engineered wood products.

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Cooperative Robotic Fabrication of Timber Dowel Assemblies

Cited by 9 publications

References 0 publications

Construction Robotics: From Automation to Collaboration

Construction Robotics: From Automation to Collaboration

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Numerical Examination of the Behaviour of Dowel Laminated Timber Elements Utilising Compressed Wood Dowels

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