Paving Stones with Contact Holders for Joint Width Control
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Solution Overview
Problem
Paving systems experience deteriorating load transfer and water permeability over time due to relative movement of shaped stones and segregation of joint materials, leading to instability and maintenance issues.
Innovation Solution
A method for producing paving with a base body and contact holders, where the joint width is determined by the contact holder dimensions, and a joint material with a specific grain size distribution is used to ensure consistent load transfer and improved water permeability, with contact holders ensuring no movement between stones and uniform joint width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional paving stones without contact holders are used, then the paving structure is simpler and easier to manufacture, but relative movement between stones occurs leading to joint material migration and deteriorating load transfer
Solution Approach 1:
The paving stone is segmented by adding contact holders as separate functional elements that protrude from the base body. These contact holders are positioned to engage with adjacent stones, dividing the load transfer function between the base body and the contact holders, thereby preventing relative movement while maintaining structural integrity
Solution Approach 2:
The contact holders act as intermediary elements between adjacent paving stones. They protrude from the base body and engage with corresponding recesses or surfaces on neighboring stones, serving as a mechanical mediator that transfers loads without allowing direct contact between the main stone bodies, thus preventing joint material migration
2Object-affected harmful factors
If wider joints are used to improve water permeability, then water drainage is enhanced, but the paving requires more jointing material and increases the spacing between stones reducing direct load transfer
Solution Approach 1:
The contact holders extract the load transfer function from the joint material and base body contact. By providing dedicated contact elements that protrude from the stone, the system separates the functions of load transfer (handled by contact holders) and water drainage (handled by wider joints), allowing both requirements to be satisfied simultaneously
Solution Approach 2:
The contact holders extend the interaction between stones into a new dimensional space - they protrude vertically from the base body surface, creating a third dimension of contact. This allows load transfer to occur through these protruding elements while the horizontal joint space remains wide enough for water permeability
3Ease of manufacture
If jointing material with wide grain size distribution is used, then the joint filling is easier and more complete, but segregation occurs leading to material migration and reduced water permeability over time
Solution Approach 1:
The patent specifies precise parameter ranges for the jointing material: grain sizes between 2-8mm and a maximum 12mm. These controlled parameters ensure the material is coarse enough to resist segregation and migration while remaining fillable. The contact holders also define a target joint width parameter that works optimally with this grain size distribution
Data Source
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AI summary
The invention relates to a method for producing a paving system comprising a plurality of shaped paving stones (2), each having a base body, wherein at least one contact holder (8, 12) is arranged on the base body and a joint (4) is located between each adjacent shaped paving stone (2), which is filled with a jointing material, the method comprising the following steps: a. Determining a target joint width from at least one dimension of the contact holders (8, 12); b. Determining an upper nominal jointing material value from the target joint width, wherein the upper nominal jointing material value corresponds to half the target joint width; c. Determining a lower nominal jointing material value, which is at least 0.5 mm; d. Selecting a jointing material whose maximum particle size is at most the nominal jointing material value and whose minimum particle size is at least the lower nominal jointing material value; e.Laying the majority of the shaped stones (2) so that there is a joint (4) between each adjacent shaped stones (2); and f. Filling the joints (4) with the selected jointing material.