Negative Mold Connection Device for Concrete Manhole Bases
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Solution Overview
Problem
Conventional methods for connecting and separating parts of a negative mold for producing concrete manhole base parts are inefficient, leading to unwanted joints and damage during demolding, especially when using materials like foamed plastic, due to the lack of effective fastening mechanisms that cover the outer contour and the difficulty in removing formwork from partially solidified concrete.
Innovation Solution
A device featuring a positioning element with a projection that temporarily attaches to the second part of the mold, allowing for stable attachment with a fastening screw, which presses the parts together, and a sleeve system for force transmission, enabling easy and secure connection and separation, even with softer materials like foamed plastic, and facilitating demolding without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fastening means are used to attach the recess core to the negative channel mold, then the attachment can be established, but the fastening means do not cover the outer contour of the recess core and the negative channel shape changes, causing unwanted joints in the finished manhole base part
Solution Approach 1:
A connection element with a connection body and connection arm acts as an intermediary between the recess core and negative channel mold. The connection arm extends into the channel structure to provide internal anchoring, while the connection body attaches to the recess core, distributing fastening forces internally and avoiding external joints on the finished product surface.
2Reliability
If the recess core is attached to the negative channel mold with conventional methods, then the attachment can be established, but loosening the attachment for demolding involves great effort and often requires destruction of the recess core and/or negative channel mold
Solution Approach 1:
The connection element provides a dynamic attachment system where the connection arm can be detached from the channel structure, and the connection body can be removed from the recess core. This allows the recess core and negative channel mold to be separated easily during demolding without requiring destruction of components, while maintaining strong attachment during the molding process.
3Productivity
If a positioning element with positioning projection is used to temporarily attach the first part to the second part, then the connection can be established quickly, but the attachment needs to be upgraded to a stable connection with a fastening screw
Solution Approach 1:
The positioning element with positioning projection is used in a preliminary action to quickly establish temporary attachment between the recess core and negative channel mold, enabling rapid assembly. Subsequently, a fastening screw is inserted through the connection element to create a stable, permanent connection that ensures reliability during the molding process.
Data Source
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AI summary
The invention relates to a device (34) for connecting two parts (18, 24) of a negative form for producing bottom parts (12) of a shaft from concrete, said device comprising: a positioning element (46) comprising a holding section (58) for holding the first part (18) of the female form on the positioning element (46), and a positioning projection (50) that can be pressed into a second part (24) of the female form, such that the positioning element (46) and the first part (18) of the female form are temporarily held on the second part (24) of the female form; and a fixing screw (38) that engages with the first part (18) of the female form and can be screwed into the second part (24) of the female form, in order to press the first part (18) against the second part (24) and to fix it thereto.