CO129-365 - Governor Sir Lugard - 1910 [1-3] — Page 418

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ma adnendnds wi? .sIdbafy ste adnata Of

been built of lime concrete faced on one side only with a skin

averaging about 15 inches of granite in cement. The abutrients

which are pier abutments are over forty feet high. The bank

round them is mostly of rock spoil from the Tunnel with a pitch-

-ed slope. The piers have a skin of masonry all round, the

filling being of lime concrete with bands of cement at every

ten feet. Waving regard to the Bank being all round the abut-

-ments there is no danger of a sudden collapse and if their is

any sinking the girders may be lifted up from time to time.

Results of construction trains running over the bridge may

therefore, be awaited but should there be any cracks in the

piers or settlement, barrel culverts may have to he substituted and the bank thrown right across as being cheper than rebuild-

-ing the bridge as it now is.

выс

18.

Bridge No. 12. I hoped putting in inverts between the

plers and abutments and by building a skin round the lime

concrete of which the abutments were made to have saved this

bridge but on stripping I found that the line concrete in tha

abutments has not set at all and the lime has perished owing

to the red earth. I say this because the same thing has occurr-

-ed with regard to a specimen of mortar from Bridge No. 6. The

thin cement rendering which was put all round has been in-

-sufficient to keep the water from the inside of the concrete

and the result is that the concrets can be taken out by handful.

I have therefore decided to pull down the bridge and rebuild

it as a barrel culvert using the old material. The founds show

hard sound yellow clay and if piled will carry the weight safe-

-ly. In general in all the designs of ardh bridges the spand-

-rils have not been carried up far enough and the cushion over

the crown which is only one foot to formation is insufficient.

Bridge No. 13. The same sort of materials have been employed. The cracks in the parapet walls are in the same

.AI

19.

to mis på din strode edt es notanimiteros san art to ang angiv .heera vez varit berufenų ok at hus arbybed teasm of

nyes ambiwď ale to aduentude AT .05 .0" onbl¬E

places as in Bridge No. 12 but the arch seems unaffected. Still

in the case of No. 12 it was only when the bridge was stripped

that