Joints used in bamboo construction From Bamboo:Gift of the Gods, Oscar Hidalgo-Lopez
Don’ts low compression strength for construction. These include: 1) less than three years old, 2) Bamboo attacked by insects or fungus, 3) Bamboo which have flowered, 4) Bamboo with cracks or which have transversal, cuts made by a machete
Nails for fixing lateral culms with smaller diameter, or for fixing joints.
Green bamboos used structurally in permanent constructions and tied with wire or ropes. When green bamboo become dry, they shrink and the ties become free
Temporary vertical supports or bamboo without any node at the lowest end which can present cracks at the moment of being fixed.
Do’s 1) Mature cullms 3 years old or older 2)Giant culms with appropriated dimensions and thick walls (more than 9 mm). 3) Culms with appropriate joints
If it is necessary to use nails for fixing small diameter bamboo (4 to 5 cm) or joints of giant bamboos, it is recommended to open a hole previously with a drill bit sligtelly smaller than the nail’s diameter. 2) For fixing horizontal and vertical structural members in temporary structures use wire ties, nylon or strong vegetal cords.
In this case it is convenient to check frequently the ties, or to use dry culms
In this case it is conven- ient thatthe temporay column has a node in the lowest end, in order to avoid the craks.
How to avoid the crushing of horizontal members Pressure
If there is not a node the bamboo becomes flattened. It is recommended to insert a wood cylinder in order to avoid the flattening
A
B Bamboo section with node
Wood cilinder.
In order to avoid the flattening of the beam in Fig. A, is necessary that the beam has a node at the end. and to fill up the internode in case that the wall thickness is small
D
C
E
Manufacture of the main types of joints
1
One flange
2
Two flanges
3
Beveled joint
4
Scarf joint
5
Fish mount joint Cut line
Use a rectangular paper
3
4
5
3
5 Aplication of joints 3 and 4
Wire tie
Joints of horizontal and vertical members Round beam
Detail No.1
Detail No.2 Wood or bamboo piece
Detail No.3
Detail No.4
Remove the internal Soft part
Detail No.5
Detail No.6
Fixing horizontal and vertical members with pins and bolts
Bamboo Dowell Bamboo Dowell
Detail No.7
Detail No.8
Metal anchorage
Detail No.10 Wood or bamboo Dowell
Dowell
Detail No.9
Detail No.11
Double and quadruple beams - supports
A Detail No.1
B Detail No.3
A
A
B Detail No.2
A
B
B Detail No.4
Horizontal joints (Not for structural members) Detail No.1 Wedge
Detail No.2 A
A Piece for increasing the tightness of the cord Bamboo Dowell
B
B Wedge Piece for increasing the tightness of the cord
Detail No.3 Detail No.4 A
A
Detail No.5 A
Bamboo Dowell
Bamboo Dowell
B
B
B
Light roof truss Detail No.1
Ridge King post
The separation of purlins tiles depends on the dimensions of roof tiles
Strut Purlin Rafter
Detail No.2
Detail No.3 Ridge
Detail No.1
Rafter King post
Detail No.2
Tension member Strut
Detail No.3 Tension member
Light truss with rafters Detail No.4
Ridge
King post
Strut Purlin Rafter Joist
Tension member
Detail No.5
Detail No.2
Detail No.3
Joist
Ridge
Detail No.4
Rafter King post Rafter
Detail No.5 Purlin Tension member
Stud
Fastening of purlings and rafters
Detail No.1
Detail No.2 Rafter
Purlin
Detail No.3
Purlin
Detail No.4
Bamboo Dowel
Purlin
Purlin Bamboo support
Rigid frame
Detail No.3
Detail No.1
Detail No.1
A
B
Detail No.2
A
B
Detail No.3
A
B