Design Element: P1 - Clad PFC Stringer

Page 1

Clad PFC Stringer

P1

design elements


The P1 staircase design embraces a particularly broad range of visual styles, since it is defined by a structural PFC stringer frame entirely clad in other materials. As the photographs in this document demonstrate, architects and designers can let their imagination off the leash with respect to form and material types. High quality stone and polished timber inline cladding may be used to clad the PFC members with a sumptuous and graceful finish (see photo opposite). The photos on pages 5 and 9 illustrate how effective a creative approach to cladding can be, resulting in the generation of a ‘stacked block’ illusion.

A 2

Timber top capping Shadow line Floor coverings (stone in this illustrative example)

Structural floor (concrete) surface

3

P1

Figure 2. Side elevation. Shadow line details are designed to interface with connecting void edge balustrade or (in the example shown) void edge capping.

12mm fixing plate

120 min

Figure 1. PFC clad with aligned timber panels incorporating shadow line detail. Isometric overview of flight to void-edge interface section.

60 min

60 min

Most balustrade types are suitable for use on the P1, but certain designs style do go together naturally, and the G1 and G2 (fully and semi- framed panel balustrade, respectively) work particularly well with P1. This is because the cladding required on the top face of the stringer members naturally serves as the bottom rail of the balustrade.

1

M16 threaded rod chemset fixing to concrete

Clad PFC stringers 150

Figure 3. Detail A: Flight to void-edge concrete slab fixing.

150 Overall staircase width

Figure 4. Front elevation. Overall width of the flight is determined by the nominated traversable width and the clad stringer detail.

F indicated on dimensions denotes a nominal dimension that typically varies according to specific application, engineering requirements or client preferences.

2

www.arden.net.au

4

Engineered concrete treads with stone veneer and folded steel bottom cover plate

Tread rise

Clad PFC Stringer

design


Clad PFC Stringer

P1

3

design elements


Clad PFC Stringer

technical

Top timber capping

Inner timber panel in two sections

The main structural work of each flight is performed by two opposed PFC members. In U or L shaped staircases, cross bracing using minor members of a lighter gauge may be employed. Plates required for fixing to structural floor or wall faces are generally inset and welded to suit the PFC profile. Where continuing stringer members are joined, mitre welds are used, but right angle joins are commonly approached via a bolted connection.

10mm shadow line Inner MDF core in two sections

MDF core sections

Outer timber panel

10mm shadow line

Bottom timber capping M16 fixing to concrete

PFC member

5

Mitre return of top timber capping Void edge nosing

Routing in inner MDF and timber panels to accept common tread

Seam of butt joined panels

Routing in inner MDF and timber panels to accept bottom tread PFC to concrete connection by angle plate welded to PFC and chemset fixed to concrete

M16 threaded rod connections

6

B

Structural floor

Common treads

Bottom tread

Plaster line / bulkhead

7

4

www.arden.net.au

Surface of floor coverings

Rise

P1

Rise

Going


Figure 6. Lower isometric view of angle bracket fixing and inner cladding panels. Inner MDF and timber panels are built in upper and lower sections in order to wrap around the pre-installed tread plates. Figure 7. Side elevation showing an illustrative example of a stone and folded metal tread style suitable for continuing a stone tile specification on flight treads. Most standard tread types can be used with the P1 clad PFC stringer.

Clad PFC Stringer

Figure 5. Clad PCF layers. The structural member is clad in MDF panels, with a final visual timber veneer that creates a shadow line detail on all four edges.

Figure 8. Detail B: Stone and folded metal tread style with concrete and steel structural support.

Stone tile tread surface finish

Stringer shadow line clear of tread nosing line

Stone edge trim

P1

Snap-in clip to attach bottom cover Steel reinforcing rod Custom folded steel plate with painted or powdercoated finish Solid concrete infill provides rigid support of stone tile

8

design elements

8

5


Clad PFC Stringer

Figure 9. Inline angle bracket connection details. PFC is cut away in order to weld an in-line angle bracket that wraps around structural void edge.

Bevelled edges of capping

Figure 10. Aligned timber panel窶田lad PFC construction summary.

PFC cutaway to place angle support bracket

Figure 11. PFC clad with vertical stepped timber box sections on lower flight and semi-sawtooth plaster sheeting on upper flight. Isometric overview.

MDF painted on outer face to enhance shadow line Fixings located to avoid interference with PFC and also to maintain appropriate separation and distance from concrete edge

9

P1 6

www.arden.net.au

Mitre return


Clad PFC Stringer

10

10 Latham strip Tread edge capping Riser edge capping Side plaster semisawtooth panel

F F

P1

11

design elements

117


Clad PFC Stringer

Random box section design creates the dominant design interest

Enclosed lower flight provides concealment of services and storage space

Raised floor extends the visual space of the staircase

12

12 Rubber riser veneer

G

H

All box section edges mitred

G

Pine core

Overlapping butt-join

Painted MDF base

13

H

P1

B

13 C

A 14

8

www.arden.net.au


Raised floor

Base of stepped timber box sections

10

Structural floor level

Figure 12. Side elevation and plan. This design highlights one of the many ways in which structural PFC staircases can be clad in an original and striking manner, in order to play a specific role in the wider architectural design. Partial enclosure on the staircase puts the void beneath the lower flight to good use. Figure 13. Isometric of lower flight showing stepped box section assembly and tread details.

140

M16 rod chemset fixing to concrete

Figure 14. Cut-away side elevation.

Clad PFC Stringer

0 20

Face of first composite riser assembly

Figure 15. Detail A: Concrete floor fixing of lower flight stringer. 15

15

P1 design elements

9


Floor coverings

Figure 17. Tread and landing support mechanisms.

M16 rod chemset fixing to concrete

75

Landing joists Landing support tag (hidden)

Figure 18. Cutaway lower isometric view showing support methods for landing joists and upper flight plaster cladding.

57

Clad PFC Stringer

Figure 16. Detail B: Concrete void edge fixing to landing PFC stringer.

Horizontal PFC member

Fixing plate inset and welded to PFC stringer member

MDF sheeting to underside of PFC

Face of bulkhead plaster

16

Pine tread core fixed from underneath Landing / riser support tag

Risers aligned with box section verticals

Rise

Tag to stringer gusset

Vertical tags support landing joists

EQ

EQ

17

P1

D: PFC to landing joist connection tag

E

D

E: Slip battens for fixing plaster to PFC 18

10

www.arden.net.au


Intellectual property is copyright Š Archstairs Pty Ltd unless otherwise agreed in writing. All rights to the document are retained. Any use of the document by clients or third parties, unless specifically authorised by Archstairs Pty Ltd, are at their own risk and the user releases and indemnifies Archstairs Pty Ltd from and against all loss or damage arising from such use.

Clad PFC Stringer

About this document

compliance Arden is a BSA licensed contractor for carpentry, joinery, glass, glazing and aluminium as well as structural metal fabrication and erection. Arden supplies a Form 16 (Licensed Contractor) on all projects. In design and construct contracts, a Form 15 (Design Engineer) certification is supplied upon request. For products and services incorporating the P1 system, this table shows compliance with relevant codes and standards.

Key full compliance with the code can comply not applicable to this element

Code

Title

BCA

The Building Code of Australia

Applicability

AS NZS 1170.1-2002

Structural Design Actions – Permanent, imposed and other actions

AS 1288-2006

Glass in Buildings. Selection and installation.

AS NZS 1554.1-2004

Structural steel welding - Welding of steel structures

AS 1554.6-1994

Welding stainless steels for structural purposes

AS NZS 4586-2004

Slip resistance classification of new pedestrian surface materials

AS 1428.1-2009

Design for access and mobility

AS 1657-1992

Fixed platforms, walkways, stairways & ladders. Design, construction and installation

P1

design note For all commercial applications, it is important that sufficient space for the stairwell cavity be allowed to satisfy Australian Standards and BCA requirements. The footprint is primarily driven by the floor to floor rise, as well as the staircase configuration chosen. However, stringer and balustrade style design may increase the amount of space required. Allowing too small a cavity can restrict the design options of the staircase. Also, points at where the staircase interacts with other structures are best addressed early in the design cycle. Consultation with Arden early on will help ensure that these design issues can be addressed in a cost-effective manner.

design elements

11


www.arden.net.au

phone (07) 3267 6100 | fax (07) 3267 6500 | email admin@arden.net.au Office & factory: 46 Radley Street Virginia Qld 4014 Australia

Postal address: PO Box 317 Virginia Qld 4014 Australia Version 1.0. Design by www.cazazz.com


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.