Threaded Sleeve Anchoring with Spacer Tubes for Deeper Concrete Placement

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Solution Overview

Problem

Existing threaded sleeves for anchoring structural elements in concrete structures are limited by their surface positioning, leading to insufficient holding forces, require expensive materials for heavier loads, and are difficult to adapt to varying construction conditions, especially with insulation layers, and are not suitable for both wooden and steel formwork.

Innovation Solution

A threaded sleeve design that allows for adjustable positioning and anchoring through a spacer tube, enabling deeper placement and increased pull-out force, compatible with both wooden and steel formwork, and adaptable to insulation thickness using a positioning or anchor plate for enhanced stability and versatility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If threaded sleeves are positioned at the surface of the structure, then installation is simple, but holding force is insufficient (limited to approximately 2800 kg)

Engineering Contradiction:

Improveinstallation simplicityVSAvoidholding force

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The threaded sleeve is divided into a base body and a separate spacer tube that can be attached as needed. This segmentation allows the sleeve to be installed simply at the surface initially, then extended deeper into the structure by attaching the spacer tube to increase holding force when required.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The threaded sleeve system transitions from a fixed surface position to a dynamically adjustable depth by attaching the spacer tube. This allows the anchoring depth to be adapted based on the required holding force, transforming the system from static to dynamic.

Inventive Principle:

Principle #15Dynamics

2Strength

If threaded sleeves are made longer to increase holding force, then extraction force capacity improves, but manufacturing complexity and stock requirements increase

Engineering Contradiction:

Improveextraction force capacityVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

Instead of manufacturing multiple lengths of threaded sleeves, the solution segments the sleeve into a standard base body and separate spacer tubes of various lengths. This reduces manufacturing complexity by standardizing the base body while allowing flexible length adjustment through spacer tube selection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The standard base body can be combined with different length spacer tubes to create threaded sleeves of various effective lengths, making a single base body design universal for multiple applications and reducing the need for specialized stock.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Strength

If threaded sleeves are made longer to increase holding force, then pull-out force improves, but installation difficulty increases due to leverage forces during concreting

Engineering Contradiction:

Improvepull-out forceVSAvoidinstallation difficulty

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The threaded sleeve is segmented into a short base body that is installed during concreting, avoiding leverage issues. The spacer tube is attached afterward to provide the additional length and pull-out force without being present during the high-risk concreting phase.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base body is installed preliminarily during concreting when it is short and poses no leverage risk. The spacer tube is attached in a preliminary action after concreting to achieve the desired final length and holding force, separating the installation phases to avoid installation difficulties.

Inventive Principle:

Principle #10Preliminary action

4Stability of the object's composition

If threaded sleeves are positioned behind insulation layers, then anchoring stability improves, but adaptation to varying insulation thickness requires specialized stock

Engineering Contradiction:

Improveanchoring stabilityVSAvoidadaptation to insulation thickness

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The threaded sleeve system is segmented into a base body and removable spacer tubes, allowing the total length to be adjusted by selecting appropriate spacer tube lengths. This enables adaptation to various insulation thicknesses while maintaining anchoring stability by positioning the threaded sleeve behind the insulation layer.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions from a fixed-length design to a dynamically adjustable length by combining the base body with spacer tubes of different lengths. This dynamic adjustment capability provides versatility to adapt to varying insulation thicknesses while maintaining the stability benefit of positioning behind the insulation layer.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3190244B1Threaded sleeve for anchoring of building elements in concrete and a spacing tube

Publication Date: 2025.07.30 ALBANESE PINO

Figure 1~6
Figure 7~10

AI summary

The threaded sleeve (1) for anchoring structural elements in a concrete structure comprises radially extending notches (13) on webs (9). A spacer tube (15) can be attached to these notches (13), which allows the threaded sleeve (1) to be installed deeper into the structure, and/or a positioning and anchoring plate (31) can be attached to the notches (13), which allows the threaded sleeve (1) to be anchored in the structure at any point and at any angle without the need to attach the threaded sleeve (1) to formwork.