clt mtb seminar_presentation_two
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Modern screw connectors
Design and use in CLT, Gluelam and LVL
By Michael Koenig
TopicsPictures of projects• Expo Roof• Airport Paris• Mt Ruapehu• Waitomo Caves
Modern screw connectors• Partial thread and full thread and field of use• Head shape and recess• Samples of connections • Pre drilling• Corrosion issues
Technical information• Where to get information from
The roof of the Expo 2000 in Germanyapprox. 10,000,000 screws are in use here, to ensure the permanent
strength of the wood.
Charles de Gaulle Airport, Paris
Cologne Zoo Elefant House
Steel to Timber connection
Knoll Ridge Cafe, Whakapapa NZ
Knoll Ridge Cafe, Whakapapa NZ
Waitomo Caves Visitor Centre
Waitomo Caves Visitor Centre
Modern screw connectors
Modern screw connectors today are:
• Self-tapping screws for use in timber structures• No pre drilling is required (except hardwoods)• The main characteristics are:
- thread: full or partial threaded- head shapes
Modern screw connectors
Full thread or Partial threadFull thread- for long screws no clamping effect- with remarkably high load bearing capacityin tension as well as in compression- inclined screws can work as framed truss
Partial thread- with clamping effect, pull together- clamping effect is depending on head shape and size
Modern Screw Connectors
Main head shapes and recess
Washer headCountersunk SPAX T-STAR plus recess for best driving home performance
Modern screw connectors
Countersunk head
• Main use for full threaded screws• Flush counter sinking in timber• Small head diameter for reduced visibility• For partial threaded screws small load bearing
capacity in tension due to head diameter• Can be used also in counter sunk steel plates for steel to
timber connections
Application examples: Countersunk ScrewsWall fastening, timber frame construction
Secure joining of wall elements, for example
Modern Screw Connectors
Washer head
• Best use for partial thread screws• Plain contact to timber• Big head diameter• For partial threaded screws high load bearing
capacity in tension due to big head diameter
Application examples: Wascher Head Screws
Fastening rafters, purlin
Fastening the rafters, pulled tightly together using the washer head screw.
No purlin anchors / triple grip necessary
High wind uplift load bearing capacity
Modern Screw Connectors
Cylindrical head
• Only use for full thread screws• Flush counter sinking with timber, or
slightly deeper sinking possible• Very small head diameter for reduced visibility• Is not recommended for use in
steel to timber connections • Also data on screw reinforcement available from Expan
Application examples: Fully Threaded ScrewsTransverse tensile reinforcement in accordance with DIN 1052:2008
Reliable alternative to bonded reinforcement boards and glued thread rods
Work can be performed by any carpenters shop
No bonding approval required
Work can also be reliably performed on site (e.g. restoration of buildings)
Roller coaster Liseberg Stockholm, SwedenSplit control of engineered dowel connections
EXPAN Quick-Connect
R afte r
S leev es(s tee l ro d s in s id e )
S c rew s
B earin g p la te s
C o lu m n
Design of connection detail
Spacing of screws
CLT – standard details
Corner jointExterior wall
partial thread
sealing tapes forair tight shell
Picture: Building with cross laminated timber of Studiengemeinschaft Holzleimbau e.V.
CLT – standard details
Ceiling connectionPlatform framing
partial thread
sealing tapes forair tight shell
Picture: Building with cross laminated timber of Studiengemeinschaft Holzleimbau e.V.
CLT – standard details
Roof connectionEave detail
partial thread
sealing tapes forair tight shell
Picture: Building with cross laminated timber of Studiengemeinschaft Holzleimbau e.V.
CLT – standard details
Wall connection verticalPartial thread with connection splice plate
Picture: Building solutions of Stora Enso
CLT – standard details
Ceiling connection with connection splice platePartial thread
Picture: Building solutions of Stora Enso
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J g
cv
CLT – standard details
Picture: Building solutions of Stora Enso
J g
cv
J g
cv
Ceiling connection Full thread with reinforcement, full thread
CLT – standard details
Picture: Building solutions of Stora Enso
Top bearer connection with steel beamFull thread
J v
J v
CLT – standard details
Picture: Building solutions of Stora Enso
Top bearer connection with upper CLT wallFull thread
J v
J v
Pre-Drilling
Do not exceed maximum drive torque
Pre-drill size should be shank Ø of the screw
Pre-drilling as a locating guide for easy installation
Corrosion control
Zinc: for internal use only
Hot dip galvanize: for external use in low corrosive areas. (Low tensile fasteners only)
Delta-Seal: ideal for treated timber in low corrosive areas
Stainless Steel: in exposed high corrosive areas
Technical Information
www.spaxpacific.com
Download the European Technical approvals
Download a SPAX Design guide (based on EC5 and ETA)
E-mail details to [email protected]
Full range of SPAX timber construction program available in Australia and New Zealand
Design software available soon
THANK YOU VERY MUCH