Clay-Straw Wall Spraying With Angled Mixing for Formwork-Free Construction
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Solution Overview
Problem
Existing methods for constructing clay-straw walls require formwork to support pressed straw blocks, limiting construction speed and flexibility, especially for non-standard designs, and do not allow precise filling of voids or shaping of the plaster layer.
Innovation Solution
A method and device that simultaneously spray a clay mixture and straw under pressure, mixing them at an angle of 30-45°, allowing for precise filling of voids and eliminating thermal bridges, enabling quick and accurate construction of non-standard designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If formwork is used to support pressed straw blocks, then wall construction can be performed with standardized blocks, but construction speed is limited and flexibility for non-standard designs is reduced
Solution Approach 1:
The patent uses pneumatic spraying to deliver clay-straw mixture through hoses to spray tips, enabling rapid application of wall material without formwork. The pressurized air system allows the mixture to be projected at high velocity, filling spaces and creating walls directly in position, which dramatically increases construction speed while simultaneously enabling complex non-standard shapes that would be difficult with pre-formed blocks.
Solution Approach 2:
The patent changes the physical state of the clay-straw mixture from solid blocks to a sprayable semi-fluid consistency. This parameter change allows the material to be delivered through hoses and sprayed into various shapes, eliminating the need for formwork while enabling both rapid construction and design flexibility. The mixture can be adjusted in consistency to optimize for different application requirements.
2Manufacturing precision
If formwork is used to support pressed straw blocks, then structural support is provided during construction, but the ability to precisely fill voids and eliminate thermal bridges is compromised
Solution Approach 1:
The pneumatic spray system delivers the clay-straw mixture in a controlled stream that can be precisely directed into voids and irregular spaces. The pressurized delivery mechanism allows the material to reach into hard-to-access areas and fill them completely, eliminating voids and thermal bridges that would occur with block construction. The spray tip can be maneuvered to target specific areas requiring precise filling.
Solution Approach 2:
The patent applies the clay-straw mixture with locally optimized properties - the material consistency and spray parameters can be adjusted for different application locations. This allows precise control over how the material fills specific voids or covers particular areas, ensuring complete elimination of thermal bridges while adapting to the local geometric requirements of the wall structure.
3Ease of operation
If pressed straw blocks are used, then material placement is simplified, but the ability to shape the plaster layer and accommodate non-standard architectural designs is limited
Solution Approach 1:
The pneumatic spray system maintains ease of operation by delivering material through a simple hose-and-tip configuration that can be maneuvered to any position. The pressurized delivery requires minimal manual handling compared to block placement, while the sprayable nature of the material enables complex shaping capabilities that blocks cannot provide.
Solution Approach 2:
The patent transitions from static block placement to dynamic spray application. The clay-straw mixture is delivered as a moving stream that can be continuously directed and shaped during application. This dynamic approach allows the wall geometry to be formed in real-time according to architectural requirements, enabling non-standard designs while maintaining operational simplicity through the consistent spray mechanism.
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
Enables rapid, precise, and cost-effective construction of clay-straw walls without formwork, allowing for customizable thermal properties and architectural flexibility.
Implementation Method 1
the clay mixture is fed under pressure through a hose to the clay mixture spray tip and the straw is fed under pressure to the straw spray tip, where it is struck by the clay mixture jet. The spray cone of the clay mixture is equal to the outflow cone of the straw stream, and the clay mixture stream crosses the straw stream at an angle of 30-45°. The straw is mixed with the clay mixture at the outlet of the mixing chamber of the straw spray tip, and at the same time the mixture is aerated
Data Source
Figure 1.1~1.3
Figure 2.1~2.3
Figure 3.1~3.3
AI summary
The invention provides a method for erecting clay-straw walls and laying clay-straw plasters, which comprises spraying the surfaces simultaneously with a straw stream and a clay mixture stream, the cone of clay mixture spray being equal to the cone of straw stream outflow and the clay mixture stream intersecting the straw stream at an angle of 30-45°. The object of the invention also comprises a set of spray tips for erecting clay-straw walls and laying clay-straw plasters.