Spiral Pipe Forming With Non-Circular Guide and No Inner Restrictor
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Solution Overview
Problem
Existing pipe-forming apparatuses for spiral pipe rehabilitation have structural enlargement and weight issues due to inner periphery restriction bodies, which can inhibit water flow and are not suitable for non-circular pipe cross sections.
Innovation Solution
A pipe-forming apparatus that forms spiral pipes without an inner periphery restriction body, using a driving part to press the strip member obliquely and a pipe end guide to engage the preceding spiral pipe portion, allowing for propelling and fitting without inner periphery restriction, and includes adjustable guide portions to accommodate non-circular cross sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an inner periphery restriction body is provided in the pipe-forming apparatus, then the cross section of the spiral pipe can be restricted and maintained, but the apparatus structure is enlarged and weight increases
Solution Approach 1:
The invention removes the inner periphery restriction body from the pipe-forming apparatus. Instead of using an internal restriction mechanism, the invention relies on the self-constraining property of the spiral wound strip member itself, which naturally maintains its cross-sectional shape through its own structural integrity and the friction between adjacent spiral turns.
Solution Approach 2:
The spiral pipe forms its own cross-sectional restriction through its own structure. The strip member, when spirally wound, creates natural friction and mechanical interlocking between adjacent turns that self-maintain the circular cross section without requiring external restriction bodies.
2Manufacturing precision
If an inner periphery restriction body is provided in the pipe-forming apparatus, then the spiral pipe can be formed with controlled cross section, but water flow is inhibited during construction
Solution Approach 1:
By removing the inner periphery restriction body, the invention eliminates the obstruction that would otherwise inhibit water flow during construction. The unrestricted internal space allows water to flow freely through the forming apparatus and the spiral pipe being constructed.
3Adaptability or versatility
If the existing pipe has a non-circular cross section, then the inner periphery restriction body needs to be changed in shape, but this results in structural enlargement
Solution Approach 1:
The pipe-forming apparatus is designed with movable and adjustable components that can dynamically adapt to different pipe cross-sectional shapes. The guide rollers and positioning mechanisms can be repositioned to match circular, oval, or other non-circular cross sections without requiring physical changes to the apparatus structure.
Solution Approach 2:
The invention allows adjustment of geometric parameters such as the spacing and positioning of guide rollers to accommodate different cross-sectional shapes. By changing these parameters rather than the physical structure, the apparatus can handle various pipe types without enlargement.
4Device complexity
If the inner periphery restriction body is omitted, then the configuration is simplified and water flow inhibition is mitigated, but the fitting stability may be affected
Solution Approach 1:
The invention utilizes the natural curvature and spiral geometry of the wound strip member to create stable fitting. The continuous spiral shape provides inherent mechanical interlocking between adjacent turns, and the curved surface geometry enhances friction and contact area, ensuring fitting stability without internal restriction bodies.
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 the formation of spiral pipes with a simple configuration, mitigating water flow inhibition and allowing for rehabilitation of non-circular pipes without structural enlargement, while ensuring stable fitting and propulsion.
Implementation Method 1
a driving part pressing an unformed following strip portion of the strip member following the preceding spiral pipe portion obliquely with respect to a machine-height direction of the apparatus frame toward a partial part or a vicinity thereof in the preceding spiral pipe portion
Implementation Method 2
a pipe end guide provided in a reverse portion of the apparatus frame in the machine-height direction, the pipe end guide being constrained with respect to the pipe end portion in a machine-width direction orthogonal to the propelling longitudinal direction and the machine-height direction, and the pipe end guide being engaged so as to be slidable with respect to the pipe end portion in the propelling longitudinal direction
Data Source
AI summary
A spiral pipe-forming apparatus includes a non-circular guide portion which is rotatable with respect to an apparatus frame around a rotary axis. The non-circular guide portion is configured to be applied to a peripheral surface of a preceding spiral pipe portion. An acting portion is configured to act such that the non-circular guide portion follows a peripheral surface of an existing pipe.