Overview     

    types of connections

friction-tight rope connections

 

connection with bamboo strips 		Friction-tight rope connections are the common connecting method. Traditionally natural materials are used:
  • cocos/sago palm fibre
  • bast
  • strips of bamboo
  • rattan

For tight connections green bamboo strips are used, the fibres are watered before tying around the bamboo. While drying, the fibres shorten and the connection becomes stronger.

Nowadays also industrial materials are used:

  • iron wire (zinc coated)
  • plastic tapes/ ropes

plugin/bolt connections

 
bracket interlocking stud Plugin/Bolt connections: Constructions with secondary interlocking elements are often used in context with rope connections. In this case the bolts have to transfer tractive and compressive forces. In wooden connections this is done by different kinds of profiles.

The metallnail is a perforating element. If the bamboo is not fresh at all, the bamboo is often splitted by the wedge shaped nail. There are two exceptional cases: The Guadua angustifolia and Chusquea bamboo from central and southern Amerika.

positive fitting connections

 

positive fitting connection 		Wooden connections with slit and tenons, like they are traditionaly used for carpenter-like constructions in Germany, are rare. There are three reasons:

  • bamboo is round
  • bamboo is hollow
  • bamboo splits
    • But although there are these problems, positve fitting connections are used in traditional bamboo buildings. Different kinds of holes are cutted into the bamboo and make it possible to connect the round bamboo rods.

    interlocking connections

    		 

    construction elements in bamboo

    		Constructions elements made of bamboo are suitable for lots of uses. Bamboo has different diameters and is thicker near the knots. Within bolting together or wedging the bamboo, lots of its tightness won't be transfered by the construction element.
    Bambu - Tec solves this problem. Prefabricated bamboosticks with certain length are covered with a cap and connected with synthetic resin. For a tight connection of the cap and the bamboo are covered with circular grooves. Because of that the grounting mass runs between the materials and confirms this construction.

    Pan-knots for spatially frame-works
    		 Pan - Spatially frame-works. This frame-work works on bamboo with diameters small than 80mm. These threaded bolts can transfer about 50% of the tractive force. For compressive forces is a front plat necessary. For overhead construction this system has to be examined by an official institut.

    Induo-compound tie     		Induo - System. This system makes it possible to transfer about 100% of the maximum rated load of large bamboo diameters.

    Transportanker - cable tie mount     		Other industrial products:

    cable tie mount with concrete reinforcement steel

    reinforcement-screw connection with concrete steel

    combined connections

    		 

    double post     		Double post, here with bounded knot and continuous handle. Within this construction the tube wall is not weakened bei drillings.
    The advantage of this system is, encumbrances of the roof and the floor are absorbed by different posts. Because of this, you can easier do repairs of defective posts.

    ZERI Pavillon EXPO 2ooo     		At the Zeri-pavillion at the EXPO 2000 were used combined connections:

    Threaded bolt tightend with mortar - typ A

    Steal mounting link with mortared bolt - typ B


    date: 30.11.01      translated by: Peter-René Menken,  David Muenscher,  Daniela Ritscher         autor: Ruediger Schmidt