900

THEORY AND PRACTICE OF ENGINEERING.

Book II.

Scaffolding. — Labour for fixing the heads on the top of the piles, including the mortiseand tenons : piles 22 centimetres in diameter are placed 3 metres apart; the heads are 22centimetres square, formed of pieces 5 metres in length ; hence the labour of each run-ning metre will comprise for the construction as follows: —

Sawing the third of a pile, forming a surface of 0-013 square

metres, at the rate of 10*50 hours per square metre - 0-14

A third of framing, mortised and tenoned at the rate of 2-25

hours for each ------ 0*75

A fifth of framing for the end, at the rate of 1*3 hour for each 0*26Placing and adjusting ------ 0*20

Which amounts per cube metre to

And for the removing, unframing, &c., for a running metre

Which amounts per cube metre to, for a carpenterDitto for a labourer

Hours of aCarpenter.

1*35

- 27*89

Hours of a.Labourer,f 0 04

\ 0*0 6

0*831*24

Workmanship of a Cube Metre of capping placed on the heads of the piles, fixed by ironpins.

Supposing the dimensions of the timbers and their distances apart to be the same as before:the labour for the construction will comprise,

Hours of aCarpenter.

Sawing the piles, as before ----- 0*14

Piercing one third of a hole, allowing a length of 7 centimetres

at an hour per metre - 0*07

Placing a third of a pin at 0*06 hours for each - - 0 02

Framing at the ends, as above ----- 0*26

Placing and adjusting ------ 0*20

"Which amounts at per cube metre to -

And for the unframing. &c., and taking out the third of a pin at

0-06 hours - - - - - 0*02

Removing, &c. ------ 0*04

Hours of a labourer -------

Which amounts for a carpenter per cube metre toDitto for a labourer ditto -

0*69

}

14-25

0*06

0-06

1-24

1*24

Labour upon a Square Metre of Waling Pieces, which secure the piles in a longitudinal direction,the piles being at 3 metres apart as before, and the pieces 25 centimetres in width.

The running metre contains a third of a pin at 0*06 hours for

each ------- 0*02

Raising and adjusting ------ 0*10

which amounts per square metre to -For the demolition a third of the pin pulled out at 0*06 hours

for one - - 0*02

Removing and stowing away ----- 0*04

Hours for a labourer -------

which amounts for a square metre to -

Hours of a labourer ------

Hours of aCarpenter.

0*12

0*48

0 06

0*06

0*24

0*24

Labour for a Square Metre of Planks placed on a scaffold to form a floor.

The construction consisting in the arrangement on the scaffold will employ - 0*02

For a labourer -------- 0*08

The removing may be considered at the same price.

Cofferdams. — Labour for a cube metre of waling pieces bolted to the piles; the timberbeing 16 centimetres square, and 5 metres in length, and the distance between the piles1 *3 metres; it will then require 39*06 running metres to form a cube metre ; the runningmetre will contain,

Hours of aCarpenter.

0*77 holes for bolts, 46 centimetres in length, giving 35 centi-metres at the rate of 3 hours per metre - - - 1 *05

\ joint at the end, at 1 *30 hours for each - - - 0*26

Putting it in its place ------ 0*20

which amounts per cube metre to

1 ■'

*51- 58*98