4. Kachhen and Zhu
This is a timber bracket shaped like a bow and reduces the length of a beam to increase the load bearing capacity. The Kachhen Zhu is different from the Zhu used on the Drey.
There are no strict rules as to the type of Zhu one can use on a particular structure. This depends entirely on the elaborateness of the adjacent architectural elements. However, the shape and proportions must be maintained.
If the Zhu is used with the Kachhen, Dhung, Pedma or and Choetseg and Tsechukhanyim must follow it.
Sometimes a double layer of Bogh is laid in place of Tsechukhanyim, which is also pemissible.
Photo 4.2a
The tail of the crossing Zhu. Dhung and Pedma at the corner is missing. It should look like in photo 4.2b.
Photo 4.2b
Photo 4.2c
Illus 4.2f
Zhu can be simplified according to the spacing of the columns or according to the significance of the structure. The Zhu shown in Photo 4.2b is more elaborate than the Zhu shown in Photo 4.2c. The simplest form of Zhu permissible on a building is the one shown in Photos 4.2d & e. The figure 4.2f shows the step of simplifying the Zhu to suit the purpose.
The thickness of the Zhu is determined by the thickness of the Dhung. It is either equal to it or slightly bigger. The length of the full Zhu is usually 6 times its depth plus the thickness of the column. However, the length of the Zhu is also restricted by the spacing of the columns but its depth will not vary.
Photo 4.2d
Simplified form of Zhu.
Illus 4.2e
Simplified form of Zhu.