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TSS Stair Landing Connectors Specification

The Invisible Connections range of telescopic connectors was developed to solve the problem of unsightly support systems for precast slabs and beams, such as traditional bracketry and/ or corbel support details.

They consist of a cast-in, structural steel hollow section with inner structural steel hollow section deployed during installation. The TSS unit is identical to the RVK unit except for the TSS unit has no opening to the upper surface. The position of the inner tube is instead adjusted by two strings with different colour. The units have a control line marking the correct position of the sliding tube, and a hole for a locking bolt. The range of TSS connectors are primarily intended for precast stairs and landings, with two standard capacities; 40 kN and 100 kN. They are also useful for conditions other than stairs.

Advantages

No bolts required.
Recess in wall provides ample tolerance.
No traditional angle supports means no crane.
Recesses are formed between wall reinforcement.
Tolerance gap required only 20 mm between landing and wall.
No tools required.
No obstructions means a clear route for following trades.
All operations are safely conducted from above landing.
Connectors automatically fireproofed after grouting.
Connectors are concealed from view.
Handles any shape concrete element.

Product reference

[TSS 41] – 40kN capacity.
[TSS 60P] – 60kN capacity.
[TSS 81-30] – 30kN axial capacity.
[TSS 101] – 100kN capacity.
[TSS 102] – 100kN capacity.

Options

TSS 60P: Slim design enables thin landings and stair thicknesses ≥120mm (full capacity 170mm). Recycled HDPE outer.
TSS 81-30: Pinned connector enables robustness requirements to be achieved where only two walls are available for connection.
TSS 102: Sound deadening rubber composite minimizes step-sound vibration from stairwell into adjacent rooms.

Steel finish

Hot dipped galvanised.

Dimensions

(w x h x t):

TSS 41 (standard version):

Outer tube: 80 x 50 x 4 mm.
Inner tube: 70 x 40 x 4 mm.

TSS 81-30 (pinned version):

Outer tube: 120 x 60 x 4 mm.
Inner tube: 100 x 50 x 6 mm.

TSS 101 (standard version):

Outer tube: 120 x 60 x 4 mm.
Inner tube: 100 x 50 x 6 mm.

TSS 102 (acoustic version):

Outer tube: 120 x 80 x 5 mm.
Inner tube: 100 x 50 x 6 mm.

Material

Steel (grade S355, minimum).

Concrete strength class

C35/45, minimum.

Reaction to fire

Class A1, according to EN 13501-1.

I’ve used your services on my last three projects (telescopic connectors for precast and continuity strip for in-situ). You’re very good at accommodating site demands for lead-in times and value competitiveness. Very happy with the service I’ve received on all three projects and hope this relationship will continue on future developments.

Paul Dean, Project Manager (Qcf), JP Dunn 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

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

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

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