20 Farringdon Street, Clerkenwell EC4

TSS and RVK Telescopic Stair Connectors

Renshaw Street, Liverpool

TSS and RVK Telescopic Stair Connectors

Home | Product | TSS and RVK Telescopic Stair Landing Connectors

TSS and RVK Telescopic Stair Landing Connectors

Invisible Connections’ range of telescopic stair connectors is designed to solve the problems associated with unsightly support systems for precast stair landings, particularly those associated with traditional bracketry.

Offsite construction methods are increasingly recognised for improving construction efficiency and providing cost certainty. With adequate planning, they can present an easier, more flexible and economical building process than conventional construction. No on site welding and minimal on site casting is necessary.

Often, by reducing on site task complexity, greater accuracy, less wastage and more rapid installation is achieved. Fewer resources contribute not only to improved efficiencies but also to environmental sustainability.

Meeting stakeholders’ demands

By using TSS and RVK telescopic connectors:

  • The Architect achieves a smooth obstacle-free soffit, with no supports on show
  • The Engineer gains a simple, efficient connection, which satisfies requirements for robustness
  • The in situ Contractor does not need to drill fixings into the wall, which require tight tolerance and can lead to variable performance
  • The Precaster keeps control of the connection within the factory with no need for specialist operations on site
  • The Main Contractor benefits from reduced crane hook-time and rapid provision of access stairs

If you would like to see our products in action, please have a look at our videos in the resources area.

Our CPD seminars and webinars explain the practicalities and theory of using Invisible Connections products and are illustrated with real world examples. If you’re an architect or engineer who would like to attend, please sign up here.

Scroll down, or jump to:

 

Stair and landing connectors

TSS Stair Connectors
Hot dip galvanised options available, for smoother operation and corrosion resistance. Cord operation means no hopper required; ideal where no screed is intended. An elegant alternative to traditional RSAs or corbels.

TSS Stair Landing Connectors

The ultimate invisible connection for precast concrete stair landings. Cord operated TSS connectors leave no blemish on the landing surface and are ideal for uncovered fair-faced concrete surfaces.

Supplied in standard or pinned versions and used in conjunction with REDiBOX wall recess formers.

RVK Stair Landing Connectors
Supplied black as standard (optionally galvanised). Sliding inner tube is deployed by a bolt mechanism, accessible via PVC hopper at landing surface. Cost-effective, rugged solution for screeded or covered landings.

RVK Stair Landing Connectors

Primarily intended to support precast stair landings off core walls. The contractor’s choice for easiest site deployment due to popular bolt ejection method. The RVK is perfect for landings which are screeded to level, or have other floor coverings.

Supplied in standard or pinned versions and used in conjunction with REDiBOX wall recess formers.

REDiBOX Wall Recess Former
Quicker and simpler to install than polystyrene or timber box-outs. Suitable for all concrete wall construction techniques (slip-form, jump-form, traditional or precast). Accommodates different floor shapes and connector layouts.

REDiBOX Wall Recess Formers

Purpose designed ‘left-in’ components to simply and easily form recesses in precast or in situ concrete walls, avoiding the need to ‘dig out’ polystyrene or timber.

Fully sealed and sized to complement the sliding inners sections of TSS, RVK and DTS connectors (all load ranges), prior to receiving cementitious grout-fill.

Choose connector by job requirements

TSS and RVK telescopic connectors can be used in different layouts according to stair landing configuration. Various layout options are shown below to help you select the most appropriate connector and download the relevant Technical Enquiry Form.

Alternatively, our Product Selection Guide offers an ‘at a glance’ overview of all Invisible Connections’ products, indicating where and how they might be used.

Landing with connectors on three sides

Landing with connectors at both ends

Integral flight and landing with connectors on side and end

Integral flight and landing with connectors on end

Integral flight and two landings with connectors on sides and ends

Integral flight and two landings with connectors at both ends

Selecting the right product

Find below which Invisible Connections’ products are best suited for your project requirements, or download our at a glance Product Selection Guide to view the entire product range, features and benefits.

TSS Stair Landing Connectors

Product NameFeaturesBenefits
TSS 60P STDTSS 60P STD
(standard version)
Slim design enables thin landings and stair thicknesses ≥120mm (full capacity 170mm). Capacity up to 60kN. Recycled HDPE outer. Use with REDiBOX PRF-STD (standard version).Sustainable, economical and lightweight connector for lighter loads.
TSS 101 STDTSS 101 STD
(standard version)
Connector capacity up to 80kN in a 200mm thick (minimum) landing, increasing to 100kN for 265mm thick landing. Use with REDiBOX PRF-STD (standard version).Versatile choice for most stair landing applications.
TSS 101 JCKTSS 101 JCK
(quick height levelling version)
Temporary capacity up to 55kN, increasing to application capacity once grouted. M16 set screw used to level landing instead of shimming. Use with REDiBOX PRF-JCK (quick height levelling version) which houses the jacking screw.Shimming is eliminated and speed of landing installation accelerated.
TSS 81-30 PINTSS 81-30 PIN
(pinned version)
Where walls are located only on 2 sides of landing, connector has to be pinned to wall to meet robustness requirements, providing axial capacity ≤30kN. Use with REDiBOX PRF-PIN (pinned version).Robustness requirements achieved where only 2 walls are available for connection.
TSS 102 PINTSS 102 STD
(acoustic version)
Incorporates sound reducing rubber composite between sliding components and landing/wall. Use with REDiBOX PRF-STD (standard version).Minimises step-sound vibration from stairwell into adjacent rooms, for high specification applications.

RVK Stair Landing Connectors

Product NameFeaturesBenefits
RVK 60P (standard version)RVK 60P STD
(standard version)
Slim design enables thinner landings and stair thicknesses ≥120mm (full capacity 170mm). Capacity up to 60kN. Recycled HDPE outer. Use with REDiBOX PRF-STD (standard version).
Hopper insert accessory available.
Sustainable, economical and lightweight connector for light loads.
RVK 101 (standard version)RVK 101 STD
(standard version)
Connector capacity up to 80kN in a 200mm thick (minimum) landing, increasing to 100kN in a 265mm thick landing. Use with REDiBOX PRF-STD (standard version).Popular and default choice for most stair landing applications.
RVK 101 JCK (quick height levellingRVK 101 JCK
(quick height levelling version)
Temporary capacity up to 55kN, increasing to application capacity once grouted. M16 set screw used to level landing instead of shimming. Use with REDiBOX PRF-JCK (quick height levelling version) which houses the jacking screw.Shimming is eliminated and speed of landing installation accelerated.
RVK 101-30 (pinned version)RVK 101-30 PIN
(pinned version)
Where wall locations are only on 2 sides of landing and connector has to be pinned to meet robustness requirements, providing axial capacity 30kN. Use with REDiBOX PRF-PIN (pinned version).Robustness requirements achieved where only 2 walls available for connection.
RVK 101-30-E20 (extended version)RVK 101-30-E20 PIN
(extended version)
This connector has a longer inner tube section, suitable where design requires a large air gap ≤40mm between landing and wall. Connector capacity ≤60kN. Use with REDiBOX PRF-PIN (pinned version).Spans large air gap between landing and wall, whilst maintaining secure embedment (in wall).

REDiBOX Permanent Wall Recess Former

Product NameFeaturesBenefits
REDiBOX PRF-STD (standard version)REDiBOX PRF-STD
(standard version)
Purpose-designed 'left-in' component for simply creating recesses in precast or in situ concrete walls. Suitable when the landing can be fixed on three sides. Use in conjunction with all 'STD' connectors: TSS 60P, TSS 101, TSS 102, RVK 60P and RVK 101.No drilling, dust or noise. Connector and recess former are concealed entirely within the floor. Provides generous tolerance for installation of stair landings: +/-35mm vertically, +/-40 horizontally.
REDiBOX PRF-PIN (pinned version)REDiBOX PRF-PIN
(pinned version)
Incorporates tie-pin to provide robustness compliance when used in conjunction with pinned connectors. Especially suitable when the landing can only be fixed on 2 ends. Use in conjunction with all 'PIN' connectors: TSS 81-30, RVK 101-30 and RVK 101-30-E20.Robustness requirements met when connectors can only be located on 2 walls.
REDiBOX PRF-TW (twin wall version)REDiBOX PRF-TW
(twin wall version)
Rebar extends horizontally, preventing interference with rear skin of twin wall. Use in conjunction with all ‘PIN’ connectors: TSS 81-30, RVK 101-30 and RVK 101-30-E20.Easier installation for twin wall manufacturers.
REDiBOX PRF-RH (reduced height  version)REDiBOX PRF-RH
(reduced height version)
Prevents projection of REDiBOX above slab level, especially at door openings. Use in conjunction with all ‘PIN’ connectors: TSS 81-30, RVK 101-30 and RVK 101-30-E20.
Accommodates a pinned connection where space is limited, such as below an aperture or in a beam.
REDiBOX PRF-JCK (quick height levelling)REDiBOX PRF-JCK
(quick height levelling version)
Supplied with a threaded M16 screw which acts as a jack. Use in conjunction with all ‘JCK’ connectors: TSS 101 JCK and RVK 101 JCK.Landings can be raised or lowered to level without shimming.
REDiBOX PRF-S2P (standard to pin)REDiBOX PRF-S2P
(standard to pinned version)
Enables access (to position pin) from outside the core wall. Use in conjunction with all ‘PIN’ connectors: TSS 81-30, RVK 101-30 and RVK 101-30-E20.Avoids excess rebate in the inner core wall where a pinned connection is required.

Stair Landing Accessories

Product NameFeaturesBenefits
Hopper insert for RVK 60PHopper InsertRemovable and reusable hopper insert for precasters. Used with RVK 60P STD.Enables a combination of RVK 60P connectors and other TSS or RVK variants to be cast into the landing at the same depth, ensuring consistent positioning.
Pin Linkage Unit (for pinned applications)Pin Linkage Unit
(for pinned applications)
Retrofitted into a concrete wall when a core hole is drilled. Used in conjunction with TSS 81-30, RVK 101-30 and RVK 101-30-E20.A remedial solution for pinned connection details where recesses have been omitted or inaccurately positioned.
Extension Piece (for pinned applications)Extension Piece
(for pinned applications)
Retrofitted between connector and recess former (pinned version) where distance between wall face to recess former pocket is larger than expected. Used in conjunction with TSS 81-30, RVK 101-30, RVK 101-30-E20 and REDiBOX PRF-PIN.A remedial solution for pinned connection detail where recess has been set too deep into the wall, or where there is horizontal misalignment between the connector and recess former pocket.

To make an enquiry, email sales@invisibleconnections.co.uk or technical@invisibleconnections.co.uk or talk to us by calling 01844 266000.

Application

Primarily intended for connecting precast stairs and landings, TSS and RVK connectors have also been used for a diverse range of applications, such as:

See more construction projects where TSS and RVK connectors have been used, or read our case studies.

Robustness

UK regulations require that all precast floor and stair elements are anchored to the main structure to provide robustness in the event of an incident. Traditionally this involved dowels or other mechanical connections into the walls, resulting in more work and additional cost on site.

TSS and RVK telescopic connectors provide this anchorage. Where layout allows, simple positioning of the connectors satisfies robustness requirements, also being a ‘zero cost’ solution. In this layout position, the connectors are designed to work laterally, in addition to carrying the vertical loads. Alternatively, where the layout dictates otherwise, factory-modified versions of RVK connectors also provide axial anchorage, by pinning the connector into the wall.

Capacity

To ensure lean and cost-efficient design, there are two standard capacities; 40 kN & 100 kN. Connectors may be used in pairs for even higher load requirements.

All telescopic connectors, from the smallest TSS to the largest BSF, incorporate integral half-round bearing blocks, for correct seating of the local reinforcement, to avoid local crushing/cracking.

Standards

Design is in accordance with the following standards:

  • Eurocode 2: Design of concrete structures Part 1-1 General rules and rules for buildings.
  • Eurocode 3: Design of steel structures Part 1-1 General rules and rules for buildings.
  • Eurocode 3: Design of steel structures Part 1-8 Design of joints.

Steel is grade S355 (minimum) which has a high stress capacity.

All TSS and RVK products are covered by appropriate European Technical Approvals, based on testing at SINTEF, the largest independent research organisation in Scandinavia.

 

Benefits

It is increasingly common to combine precast concrete stairs and landings with core walls which are poured in situ. When connection methods are left as an afterthought, using rolled steel angles is often the only practical, yet inefficient, fixing solution.

With a little upfront planning, there’s much to gain by incorporating telescopic connectors, which come with a host of advantages; such as improved health and safety, robustness compliance, and significantly improved cost effectiveness.

REDiBOX Permanent Recess Former

All TSS and RVK telescopic connectors work in conjunction with the relevant REDiBOX permanent recess former. A purpose-designed ‘left-in’ component to simply create recesses in either precast or in situ concrete walls, REDiBOX is suitably sized to accommodate the telescopic connector’s sliding inner section before receiving cementitious grout fill.

Manufactured from high density polyethylene (HDPE), the REDiBOX permanent recess former has a ribbed monocoque structure on all sides to provide strength and a substantial key for the outer concrete.

The REDiBOX faceplate can be nailed to timber moulds or shutters. Alternatively, fixing lugs on all sides provide ample points to tie-wire the unit to the wall reinforcement, which is ideal for slip forms. A central ‘soft eye’ in the faceplate is designed so that a hammer claw can be inserted to withdraw the faceplate easily to reveal the open recess.

REDiBOX (STD)

The standard version is designed to work in conjunction with TSS 41, TSS 101, TSS 102 and RVK 101.

The recess measures 180 mm wide x 120 mm high x 104 mm deep. Setting out in the wall should be from the top edge of the faceplate, which for an RVK 101 connector is 27 mm below the top of the landing. If a TSS connector is specified, setting out will be project-specific owing to the variable depth of the connector within the slab.

REDiBOX (PIN)

The pinned version is designed to work in conjunction with TSS 81-30 and RVK 101-30.

The recess measures 180 mm wide x 230 mm high x 120 mm deep. Setting out in the wall should be from the top edge of the faceplate, which for an RVK 101 connector is 90 mm above the top of the precast landing (without finishes). If a TSS connector is specified, setting out will be project specific owing to the variable depth of the connector within the slab.

Product Drawings
Enquiry Forms
Invisible Connections' Videos for connecting precast concrete elements using telescopic connectors
Seminar/webinar icon

 

Can't find what you're looking for? Our resources area provides much more information. Or get in touch.

 

Related projects

If you would like to discuss your specific project requirements, please contact us for technical advice without obligation.

We have completed installation of our stairs in both cores, using TSS connectors. Everything went smoothly, quickly and easily. The new anti-uplift brackets have done the job perfectly.

Matthew Bialecki, Senior Engineer, J. Coffey Construction Ltd 
Matthew Bialecki, Senior Engineer, J. Coffey Construction Ltd

Telescopic connectors provide us numerous advantages for precast stair installation. Apart from improved time and efficiency, the health and safety gains over traditional support methods are a key driver to satisfy our own needs, as well as those of our clients.

Shane Dunleavy, Project Manager, Morrisroe 
Shane Dunleavy, Project Manager, Morrisroe

Thank you for sending the calculations and installation advice. The new calculation software looks great. Very clear, user friendly and with more design checks than the previous version. It’s a pleasure to see how you are constantly improving.

Stefan Pauceanu, Senior Structural Engineer, Ground Construction Ltd 
Stefan Pauceanu, Senior Structural Engineer, Ground Construction Ltd

As specialists in precast concrete car park construction, we use telescopic connectors for many key applications. Particularly, the BSF system helps us to construct a ‘modern’ frame without cumbersome corbel supports and enables rapid assembly on site. The technical back-up provided by Invisible Connections provides us with added reassurance.

Peter Crofts, Precast Design Manager, SCC Design Build Ltd 
Peter Crofts, Precast Design Manager, SCC Design Build Ltd

  ​   

 

  

  

© 2021 Invisible Connections Ltd | All Rights Reserved | Privacy Policy | Cookies

Invisible Connections, FERBOX and REDiBOX are registered trademarks