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Invisible Connections Ltd

+44 (0)1844 266000 www.invisibleconnections.co.uk

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Achieving robustness of precast concrete stairs using proprietary cast-in inserts

Precast concrete stair flights and landings are a common form of construction. As individual elements they are inherently robust, and as the spans of such elements are relatively small, flexural or shear failures are very rare. In the event of an occurrence such as fire or the failure of lifts, stairs often provide the only practical means of escape for the occupants of a building. It is vital therefore, that stairs remain available and useable under extreme conditions without suffering progressive collapse. One method through which this can be achieved is the anchoring of the individual elements into the structure.

BSF Product Information

Precast concrete beams and columns is an aesthetic and efficient method of concrete frame construction. Increasingly, architects seek visibility of the structural form, whilst maintaining elegance and structural integrity. Traditional brackets and corbels are difficult and costly to form, reduce headroom and compromise architectural clean lines. For high-load beam connections (up to 1100 kN), the BSF system incorporates a solid high-strength steel knife to transfer loads between beams and columns, or beams to beams. BSF connectors leave a smooth soffit and are also suitable for round columns or skewed angle connections. Owing to simplicity of installation, BSF connectors offer improved appearance and better on site health and safety than rolled steel angle (RSA) or corbel connections.

CARES Quality Management System (ISO 9001:2015)

Reinforcement continuity strips are important structural components which require performance validation. CARES Technical Approval provides this validation through a process of structural testing, regular mechanical testing and audit. This meets the quality assurance needs of professional stakeholders and enables compliance with the National Structural Concrete Specification (NSCS) published by Construct Concrete Structures Group. Invisible Connections is a CARES approved manufacturer of reinforcement continuity systems.

CARES Technical Approval Certificate Ferbox

Invisible Connections is a CARES approved manufacturer of Ferbox reinforcement continuity system. Reinforcement continuity strips are important structural components which require performance validation. CARES Technical Approval provides this validation through a process of structural testing, regular mechanical testing and audit. This meets the quality assurance needs of professional stakeholders and enables compliance with the National Structural Concrete Specification (NSCS) published by Construct Concrete Structures Group.

CARES Technical Approval Report Ferbox

Invisible Connections is a CARES approved manufacturer of Ferbox reinforcement continuity system. Reinforcement continuity strips are important structural components which require performance validation. CARES Technical Approval provides this validation through a process of structural testing, regular mechanical testing and audit. This meets the quality assurance needs of professional stakeholders and enables compliance with the National Structural Concrete Specification (NSCS) published by Construct Concrete Structures Group.

CE Certificate of Factory Production Control (EN1090)

Invisible Connections' range of TSS or RVK stair connectors and DTS or BSF beam and column connectors are designed to solve the problems associated with unsightly support systems for precast stair landings, beams and columns, particularly those associated with traditional bracketry. These systems are endorsed by European Technical Approvals (ETAs), comply with relevant Eurocode standards and are individually CE marked.

DTS Product Information

Precast concrete beams and columns is an aesthetic and efficient method of concrete frame construction. Architects seek visibility of the structural form, whilst maintaining elegance and structural integrity. Traditional brackets and corbels are difficult and costly to form, reduce headroom and compromise architectural clean lines. A cost-effective and structurally efficient alternative for end loads up to 150 kN is the DTS or DTF range of telescopic or static connectors which leave a smooth soffit and are also suitable for round columns or skewed angle connections. Simplicity of installation enhances on site health and safety. DTS/DTF offers an economical choice for load applications which fall between the performance parameters of TSS/RVK stair landing connectors and BSF beam connectors.

Effective installation of precast stairs in high-rise construction

For many years, the preferred form of stairs in high-rise construction has been precast concrete. Produced off-site, they can be delivered and installed as required by the site programme to create instant access (and egress) as the structure goes up. Additionally, as with most precast concrete, they can be manufactured with high-quality finishes, not requiring further cosmetic work. However, the installation method of the stairs can introduce risks.

European Technical Approval (ETA) BSF Connectors

Invisible Connections' range of BSF beam and column connectors are designed to solve the problems associated with unsightly support systems, particularly those associated with traditional bracketry. For high-load beam connections (up to 1100kN), the BSF system provides a 3-part connection incorporating a solid high-strength steel ‘knife’ to transfer loads between beams and columns, or beams to beams. All BSF systems are endorsed by European Technical Approvals (ETAs), comply with relevant Eurocode standards and are individually CE marked.

European Technical Approval (ETA) DTF and DTS Connectors

Invisible Connections' range of DTF or DTS beam and column connectors are designed to solve the problems associated with unsightly support systems, particularly those associated with traditional bracketry. Originally designed for connecting precast Double Tee floor elements, the DTF or DTS system can also be used for lightweight beam connections. All DTF and DTS systems are endorsed by European Technical Approvals (ETAs), comply with relevant Eurocode standards and are individually CE marked.

European Technical Approval (ETA) TSS/RVK Connectors

Invisible Connections' range of TSS or RVK stair connectors and REDiBOX® permanent recess formers is designed to solve the problems associated with unsightly support systems for precast stair landings, particularly those associated with traditional bracketry. These systems are endorsed by European Technical Approvals (ETAs), comply with relevant Eurocode standards and are individually CE marked.

Ferbox Brochure ICL-FB-0719

Reinforcement continuity system enabling connections to be made between concrete elements. The system is largely bespoke, to ensure reinforcement design requirements are accommodated without compromise. The system is manufactured within a CARES quality system environment and is also endorsed by a CARES Technical Approval.

Ferbox Comparison Study: Why Use Specials?

This study compares using off the shelf stock lengths (standards) with purpose-made specials reinforcement continuity strip. Based on the concrete cores of a residential construction project where FERBOX was used, analysis found 20% wastage of materials plus consequent wasted labour and other indirect costs if stock lengths had been used. Made-to-measure specials also results in increased construction efficiencies and improved health and safety on-site, by reducing exposure to power tools and other risks. Reinforcement continuity strip is structural component and requires performance validation: a CARES approved system such as FERBOX meets the QA needs of stakeholders and enables compliance with the National Structural Concrete Specification (NSCS).

Flight Connections at Manchester Airport

A tried and trusted connection solution for rapid construction, Invisible Connections telescopic connectors are being used extensively throughout the structural frame and cores for the Global Gateway transformation programme at Manchester airport.

Invisible Connections in the Leadenhall Building, London

On a building of this scale, technical problems and the need for novel solutions, cascaded right down to component level and an example of this was the precast core walls. Although not required for the purposes of stability, the core walls still formed stairwells and lift shafts, and needed full integrity. To maintain predetermined load distribution, many walls could not be directly supported off adjacent steelwork. The alternative was to support some wall panels off others, but this had to be done invisibly. By thinking outside the box, TSS telescopic connectors were used to achieve an elegant and efficient solution.

Product Selection Guide

An at a glance overview of all Invisible Connections products, indicating where and how they might be used. A description, key features and benefits accompanies each product to aid selection according to project requirements. Products are grouped by range: Stair Landing Connections (TSS and RVK); Stair Landing Accessories and Flight Connections (REDiBOX Permanent Recess Formers and retrofit solutions); Beam and Column Connections (BSF and DTS) and Reinforcement Continuity Strip (FERBOX)

REDiBOX Permanent Recess Former (Pinned Version)

A purpose-designed left-in component for easy forming of recesses in concrete core walls (precast or in situ) enabling efficient precast landing connections, especially suitable when the landing can only be fixed on two ends. Sized and configured to receive sliding inner sections of RVK 101-30 or TSS 81-30 Telescopic Stair Connectors; either product combination accommodates shear load requirements but additionally provides an axial tie connection (up to 30kN) between the precast landing and wall, satisfying UK design requirements for robustness.

REDiBOX Permanent Recess Former (Standard Version)

A purpose-designed left-in component for easy forming of recesses in concrete walls (precast or in situ). Suitably sized to complement the sliding inner sections of standard TSS & RVK Telescopic Connectors (all load ranges) prior to receiving cementitious grout fill.

RVK Product Information

Combining precast concrete stairs and landings with core walls which are poured in situ is increasingly common. Owing to simplicity of installation and superior fixing tolerance, RVK connectors offer key benefits over RSA or corbel connection methods, such as: Significantly improved health and safety Inherent robustness compliance and fire resistance Demonstrable cost efficiency Aesthetic solution to achieve smooth, clean lines which can also accommodate curved walls

Telescopic Connectors brochure ICL-TC-0315

'Invisible' telescopic systems for connecting concrete elements together (precast to precast, or precast to in situ), enabling simple, cost effective construction methods and eliminating unsightly support methods. All ETA approved.

Telescopic connectors or rolled steel angles which is the smarter way to install precast concrete staircases?

This study compares the costs of rolled steel angles (RSAs) against RVK 101 telescopic connectors to support precast concrete stair landings off core walls. When the costs of materials and labour were calculated, findings show telescopic connectors reduced man hours by 80%, contributing to a total 33% reduction in direct costs. Furthermore, robustness anchorage is inherent to the design layout, with no need for costly, supplementary measures typically required with RSAs. Other benefits of using telescopic connectors instead of RSAs include reduced waste, cranage and noise as well as increased safety, robustness, speed and efficiency.

TSS Product Information

Combining precast concrete stairs and landings with core walls which are poured in situ is increasingly common. Owing to simplicity of installation and superior fixing tolerance, TSS connectors offer key benefits over RSA or corbel connection methods, such as: significantly improved health and safety; inherent robustness compliance and fire resistance; demonstrable cost efficiency; aesthetic solution for achieving smooth, clean lines which can also accommodate curved walls.

Showing 1-24 of 24