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![GALLERIES
A gallery is a formed opening left in a dam. This may in transverse or longitudinal
direction and may run horizontally or on a slope. The shape and size vary from dam to
dam and is generally governed by the functions it has to perform. Following are the
purpose s for which a gallery is formed in the dams.
1. To provide drainage of the dam section. Some amount of water constantly seeps
through the upstream face of the dam which is drained off through galleries.
2. To provide facilities for drilling and grouting operations for foundations etc. Drillings
for drain is generally resorted to clean them if they are clogged. High pressure
grouting and required drilling for it is generally carried out after the completion of
dam. This can be best done through galleries.
3. To provide space for header and return pipes for post cooling of concrete and grouting
the longitudinal joints after completion of dam.
4. To provide access to observe and measure the behaviour of the structure after its
completion by fixing thermo-couples examining development of cracks etc.
5. To provide an access of mechanical contrivances needed for the operation of outlet
gates and Spillway gates.
Fig. shows two typical shapes of galleries. In the rectangular gallery [First Fig.], all the
corners should be rounded so that stress concentration is minimum. Where drainage
trough is required, a rectangular trough such as at c is necessary, though shape d is
preferred
Second Fig. shows another form. To provide walkway, the semi-circular bottom is filled
in with an unbounded slab.](https://image.slidesharecdn.com/galleries-210509102849/75/Galleries-1-2048.jpg)
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Galleries
- 1. GALLERIES A gallery isa formed opening left in a dam. This may in transverse or longitudinal direction and may run horizontally or on a slope. The shape and size vary from dam to dam and is generally governed by the functions it has to perform. Following are the purpose s for which a gallery is formed in the dams. 1. To provide drainage of the dam section. Some amount of water constantly seeps through the upstream face of the dam which is drained off through galleries. 2. To provide facilities for drilling and grouting operations for foundations etc. Drillings for drain is generally resorted to clean them if they are clogged. High pressure grouting and required drilling for it is generally carried out after the completion of dam. This can be best done through galleries. 3. To provide space for header and return pipes for post cooling of concrete and grouting the longitudinal joints after completion of dam. 4. To provide access to observe and measure the behaviour of the structure after its completion by fixing thermo-couples examining development of cracks etc. 5. To provide an access of mechanical contrivances needed for the operation of outlet gates and Spillway gates. Fig. shows two typical shapes of galleries. In the rectangular gallery [First Fig.], all the corners should be rounded so that stress concentration is minimum. Where drainage trough is required, a rectangular trough such as at c is necessary, though shape d is preferred Second Fig. shows another form. To provide walkway, the semi-circular bottom is filled in with an unbounded slab.