Prestressing Device for Round Formwork Tension Control

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Solution Overview

Problem

The removal of outer formwork from round containers is hazardous due to sudden ring tension release when wedges are knocked out, posing a risk to operators during the concrete curing process.

Innovation Solution

A method involving a prestressing device, such as a scissors-type clamp or fork, is used to gradually release the tension in the outer formwork ring by biasing adjacent formwork panels before disconnecting them, allowing controlled removal of the formwork panels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If wedges are knocked out to remove outer formwork, then formwork removal is achieved, but sudden ring tension release occurs causing safety hazards

Engineering Contradiction:

Improveformwork removalVSAvoidsudden tension release

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The invention applies preliminary action by introducing a prestressing device that gradually releases the ring tension before the actual formwork removal. The device includes a prestressing element that can be adjusted to control the release of tension, preventing sudden discharge while facilitating safe formwork removal. This preliminary control mechanism addresses the safety hazard by managing the tension release process in advance.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If outer formwork rings are lowered progressively from bottom to top, then safety is improved, but removal time increases

Engineering Contradiction:

ImprovesafetyVSAvoidremoval time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The invention replaces the traditional mechanical lowering process with a prestressing device that uses controlled tension release to facilitate formwork removal. The device includes a prestressing element that can be adjusted to control the release of tension, allowing faster removal while maintaining safety through controlled tension management rather than progressive mechanical lowering.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 method ensures safe and controlled removal of the outer formwork by preventing sudden tension release, enhancing operator safety and simplifying the process through remote actuation and integration with lifting mechanisms.

Implementation Method 1

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentEP2101016B1Method for removing the external formwork of round container formworks

Publication Date: 2015.05.27 WOLF HLDG

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AI summary

The device has a number of stripping panels (31) connected with each other to a ring, where two of the stripping panels are attached and provided adjacent to each other. A cutter is coupled with the two stripping panels to pretension edges of the two stripping panels. The cutter has two blades that are flexibly connected with each other. A drive is provided to change the distance of free ends of the blades from each other. The blades are mounted at a base of the cutter, where the drive is arranged and/or supported at the base. Independent claims are also included for the following: (1) an external formwork of a round tank formwork for use with a stripping device (2) a conductor cage for with a stripping device.