J
E
3
will easily be completed in about 12 months.
272
The other three sections, however, are all heavy and will have to be specially dealt with if they are to be finished within a reasonable period.
Taking section No. 1 first. No. 1 cutting is about a mile long and in one or two places will be about 100 ft. deep. It contains about 851,852 cub. yds., but a further 655,556 cub. yds. will have to be taken from it in order to provide the filling for the station ground reclamation. The material is decomposed granite with granite boulders and here and there solid granite will be met with. It is impossible to finish this cutting in a reasonable time if it were only worked by driving a gullet from one end. The first 500 lineal yds. of the cutting is through a high ridge and beyond that it runs about 50 ft. in depth down a narrow valley. We have therefore recommended that a heading on a gradient of 1 in 50 should be driven through the ridge and the upper lift of the excavation for the cutting should be worked out through this heading whilst the rest of the cutting is simultaneously worked from the south end, a gullet being driven through the lower lift. This work will require two or three contractors' engines, and a considerable force of labour will have to be imported.
With regard to the reclamation, this will have to be retained on the sea side by rubble bank surmounted by a dwarf retaining wall or partly in this and partly by some form of retaining wall built up from the sea bottom.
The southern end of the reclamation for a distance of about 800 ft. will be in water varying from 26 to over 30 ft. deep at low water, and would accommodate vessels of deep draught if a suitable retaining wall were designed.
If a solid masonry wall be constructed it would have to be founded upon pierre perdu placed in a dredged trench and this would be troublesome and expensive.
If only
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J
E
3
will easily be completed in about 12 months.
272
The other three
sectins, however, are all heavy and will have to be specially dealt with if they are to be finished within a reasonable period.
Taking section No. 1 first. No. 1 cutting is about a mile long and in one or two places will be about 100 ft. deep. It contains about 851,852 cub. yds., but a further 50 655,556 cub. yds. will have to be taken from it in order to provide the filling for the station ground reclamation. The material is decomposed granite with granite buolders and here and there solid granite will be met with. It is impossible to finish this cutting in a reasonable time if it were only worked by driving a gullet from one end. The first 500 lineal yds. of the cutting is through a high ridge and beyond that it runs about 50 ft. in depth down a narrow valley. We have therefore recommended that a heading on a gradient of 1 in 50 should be driven through the ridge and the upper lift of the excavation for the cutting should be worked out through this heading whilst the rest of the cutting is simultaneously worked from the south end, a gullst being driven through the lower lift. This work, will require two
number of tip angons
large or three contractors engines, & considerable force of labour will have to be imported.
and a
With regard to the reclamation, this will have to
be retained on the sea side by rubble bank surmounted by
a dwarf retaining wall or partly in this and partly by some
form of retaining wall built up fro the sea bottom.
The southern end of the reclamation for a distance
of about 800 ft. will be in water varying from 26 to over 30ft deep at low water, and would accomodate vessels of desp draught if a suitable retaining wall were designed.
If a solid masonry wall be constructed it would have to be founded upon pierre perdu placed in a dredged trench and this would be troublesome and expensive.
If
only
-77-
eas
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