. Handbook of construction plant, its cost and efficiency. Fig. 79. Derrick fittings bought for second-hand derrick of similardescription as above for use with 3 drum hoist and a clam shellbucket -cost as follows: 1400 lineal feet %x6xl9 crucible steel W. R. cable $ 3 14 double bronzed bushed blocks at $ 1 14 single bronzed bushed blocks 2 12 sheaves bronzed bushed blocks at $ 12 guy clamps and bolts for % rope at 24c 1 12 snatch block bronze bushed Total $ A car provided with an A frame, a hoisting engine and lightjack arms, capable of lifting 5
. Handbook of construction plant, its cost and efficiency. Fig. 79. Derrick fittings bought for second-hand derrick of similardescription as above for use with 3 drum hoist and a clam shellbucket -cost as follows: 1400 lineal feet %x6xl9 crucible steel W. R. cable $ 3 14 double bronzed bushed blocks at $ 1 14 single bronzed bushed blocks 2 12 sheaves bronzed bushed blocks at $ 12 guy clamps and bolts for % rope at 24c 1 12 snatch block bronze bushed Total $ A car provided with an A frame, a hoisting engine and lightjack arms, capable of lifting 5-ton boulders, etc., costs from$1,500 to $2,000 new. See Fig. 79. DERRICKS 195 IRONS FOR POWER-OPERATED STIFF-LEG DERRICKS The following- list, to accompany Fig. 80, enumerates the mostimportant metal parts of stiff-leg derricks to be operated bypower. It does not include guide sheaves, blocks, or otherrunning Iron Work Complete for Power Stiff-Leg Derrick—AsRegularly Furnished. 1 Mast Top with straps and gudgeon Mast Bottom complete with step, double sheaves and strap for Flat Bolted Boom Band with 2 links. D. 1 Single Boom Sheave with boxes, for center of mast. E. 1 Double Sheave Mast Bracket. F. 1 Top Stiff Leg Iron. H. Lower Stiff Leg Irons (twoof these furnished), andall necessary bolts. 196 HANDBOOK OP CONSTRUCTION PLANT Prices of derrick (not including timber, engine, bull wheel orguide sheaves, blocks, hoisting rope, clamps or thimbles) are: Size of mast timber (inches).... 8x8 14 x 14 18 x 18 Length of mast (feet) 24 40 36 Size of boom (inches) 6x6 12 x 12 16 x 16 Length of boom (feet) 32 54 54 Size of stiff legs and sills (in.). 6x6 12 x 12 16 x 16 Capacity in tons 1 to 2 10 to 12 20 to 25 Shipping weight (lbs.) 750 2100 7000 Price with self-lub. sheaves $ $ $ On railroad work in Newark it took six men and a foremanone day to move a stiff-leg derric
Size: 1507px × 1657px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
