Swelling Strip Joint Sealing for Slab Laying
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Solution Overview
Problem
Existing methods for laying slabs and paving stones are inefficient due to the need for separate steps in laying panels and filling joints, which can lead to weeds growing through sand-filled joints and stress-related cracking from cement-based mortars, and previous solutions complicate joint spacing and sealing.
Innovation Solution
A system and method that utilize prefabricated panels with attached spacers and an expandable plastic swellable strip for sealing joints, where the swellable strip is pre-fastened to the panels before laying, allowing for easier installation and adjustment of joint widths, and expands in response to moisture or heat to seal gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If joints are filled with loose sand and mineral mixtures, then permeable joints are achieved, but weeds can grow through the joints
Solution Approach 1:
The joint filling material changes its physical state from compressed (initially) to expanded (after activation). The swellable material is introduced in a compressed state to fit within the joint, then undergoes parameter change by absorbing moisture and expanding to fill gaps and prevent weed growth while maintaining joint stability
Solution Approach 2:
The joint filling system uses a composite approach combining swellable material with activation fluid (moisture). The swellable material alone provides structural support and weed prevention, while the activation fluid triggers expansion to ensure complete joint filling and bonding, creating a multi-functional composite solution
2Reliability
If cement-based mortars are used to fill joints, then tight joints are achieved, but expansion of panels and elasticity differences lead to stresses and cracking
Solution Approach 1:
The joint filling material transitions from a static, rigid cement mortar to a dynamic, adaptable swellable material. The material can change its volume and density in response to environmental conditions, allowing it to accommodate panel expansion and contraction without generating harmful stresses, while still providing effective joint sealing
Solution Approach 2:
The material undergoes controlled parameter changes by absorbing moisture and expanding after installation. This gradual expansion allows the material to adapt to the joint space and panel movements, providing tight sealing without the rigidity that causes cracking in cement-based mortars
3Manufacturing precision
If spacers are used to set desired joint width, then joint spacing is controlled, but the laying process requires separate steps for panel placement and joint filling
Solution Approach 1:
The system merges the functions of spacers and joint filling material into a single integrated component. The swellable material is pre-positioned within the joint space during panel laying, eliminating the need for separate spacer installation and subsequent joint filling operations, thereby controlling joint width while improving productivity
Solution Approach 2:
The joint filling material is prepared and positioned in advance during the panel laying process. By pre-placing the swellable material in the correct position and configuration before final panel installation, the system ensures precise joint width control is achieved as part of the primary laying operation rather than as a subsequent separate step
4Reliability
If a strip of impregnated and compressed foam is placed in joints, then sealing is achieved, but the strip expands immediately upon unrolling requiring immediate insertion
Solution Approach 1:
The swellable material is prepared in a stable, non-expanded state that can be stored and handled without immediate expansion. This preliminary preparation allows the material to be positioned and installed at the installer's convenience, eliminating the urgency and complexity associated with materials that expand immediately upon unrolling
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 approach simplifies the laying process by eliminating the need for separate joint filling, prevents weed growth, and accommodates thermal expansions, resulting in a more efficient and durable surface with reduced risk of cracking.
Implementation Method 1
The system also includes an expandable material to seal joints between the panels. A swellable material is understood to mean a material which, under certain conditions—in particular when exposed to moisture and/or heat—increases its volume and thus 'swells'.
Implementation Method 2
the swelling tape has the advantage that the swelling tape corresponds to the shape of the joints to be sealed and only has to be cut to a suitable length... the swelling tape prevents weed growth in the joints... efficient laying and the ability to absorb thermally induced expansions of the surface
Data Source
Figure 1a~1c
Figure 2a
Figure 2b
AI summary
A system (1) for laying slabs (2) on a substrate (3) is presented and described, comprising: at least two slabs (2), at least two spacers, in particular joint crosses (4), for adjusting the width (B) of the joints (7) between the slabs (2), and swelling material for sealing joints (7) between the slabs (2). To simplify the laying of the slabs (2) and the sealing of the joints (7), it is proposed that the swelling material be a swelling strip (5) made of plastic. A method for laying slabs (2) on a substrate (3) is also presented and described.