Bamboo conexions

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