Description | Tasks | Average | Range (Min-Max) | ||
Plates, brackets, and fly braces | |||||
Prepare bowl connections, cleats and stiffeners, rectangular | piece | 4.5 min | 3-6 min | ||
shape ex flat bar, no exceeding 300mm wide or 16mm | |||||
thickness; guillotine to size and also punch holes, making use of hydraulic | |||||
ram punch and shear machine. You are watching: Man-hours per ton structural steel | |||||
Same together last but irregular shape ex plate, or exceeding | piece | 9 min | 6-30 min | ||
300mm large or 16mm thickness; cut to dimension and kind holes— | |||||
punch and shear, fire cut, or drill equipment. | |||||
Prepare edge brackets or fly braces no exceeding 1.5m long; | piece | 9 min | 6-12 min | ||
guillotine come length and punch holes—using punch and shear. | |||||
Slotted feet in preferably 20mm plate or angle—punched and | slot | 7.5 min | 6-10 min | ||
flame slotted. | |||||
Mark and also tack key connections, cleats and also stiffeners in | No | 6.5 min | 5.5-7.5 min | ||
position top top beams, columns etc, square and also not exceeding | |||||
400mm length. See more: 2000 Toyota Camry Ac Light Blinking And Its Blows Hot Air, Sparky'S Answers | |||||
Same together last but bracing cleats, key 400mm to 1000mm | No | 12 min | 8-15 min | ||
length, or i know well rafter bowl etc. | |||||
Cutting sections | |||||
Cut second sections, up to 150mm—angles, PFCs, HS | piece | 15 min | 12-20 min | ||
Extra worth for each finish mitre cut, or notch cut | end | 6 min | |||
Extra Value straight join including prepare and also vee butt weld | join | 1.0 hr | |||
Cut sections to length, up to 310 UB/UC/PFC/HS | piece | 28 min | 26-30 min | ||
Extra worth for each finish mitre cut, or notch cut | end | 12 min | |||
Extra Value cut and kind taper end, approx 300mm long | end | 45 min | |||
Extra Value directly join including prepare and vee target weld | join | 2.5 hr | 1.5-3 hr | ||
Cut sections, over 310 UB/UC/PFC/RHS | piece | 40 min | 35-55 min | ||
Extra worth for each finish mitre cut, or notch cut | end | 15 min | |||
Extra Value cut and type taper end, approx 500mm long | end | 72 min | 60-80 min | ||
Extra Value right join including prepare and also vee butt weld | join | 4.5 hr | 3.5-5.5 hr | ||
Labours to all sections | |||||
Drill bolt feet in structural sections | hole | 6.5 min | 4.5-7.5 min | ||
Form slotted bolt feet in structural sections | slot | 15 min | |||
Gas cut and also grind edge for reduced outs, penetrations, straight | metre | 20 min | |||
Same as last, circular | metre | 30 min | |||
Assemble and tack portal structure knee, apex, or k-brace join | join | 1.25 hr | 1-1.5 hr | ||
Assemble second section structure joins | join | 30 min | 20-45 min | ||
Precambering; up to 310 UB or UC | No | 2.5 hr | 1-3 hr | ||
Precambering; over 310 UB or UC | No | 3.5 hr | 3-6 hr | ||
Cut, prepare and also assemble corbels, tapers, haunchings etc | No | 1 hr | 0.75-2 hr | ||
max. 1m long | |||||
Assemble composite members, e.g. Crane beam channel onto | metre | 30 min | |||
UB | |||||
Truss cutting and also assembly | |||||
Cut truss diagonals and also struts | piece | 12 min | 10-15 min | ||
Extra worth mitre cut or notch ends | end | 7.5 min | 6-9 min | ||
Cut, prepare, join and also weld chord, best 250 PFC or UB | chord | 1.5 hr | 1.25-2 hr | ||
x 12m long | |||||
Mark the end and collection up jig because that truss assembly x 12m long | No | 4 hr | 3-6 hr | ||
Assemble truss top and also bottom chords through diagonals and | truss | 4 hr | 3-6 hr | ||
struts x 12m long, in jig | |||||
Extra worth to precamber truss, x 12m long | No | 2 hr | 1-3 hr | ||
Diagonal bracing | |||||
Diagonal bracing rod cut, join, assemble turnbuckles, threaded | No | 40 min | 20-60 min | ||
ends | |||||
Diagonal bracing angle cut, join, drill bolted ends | No | 50 min | 30-75 min | ||
Welding—80% downhand, 20% vertical | |||||
5 and also 6mm fillet weld | m | 18 min | 15-22 min | ||
8mm fillet weld—2 runs | m | 32 min | |||
10mm fillet weld—3 runs | m | 46 min | |||
12mm fillet weld—4-5 runs | m | 72 min | |||
Vee prepare end of UB, UC, PFC, HS for target weld, max | end | 8 min | |||
300mm depth | |||||
Same together last, end 300mm | end | 12 min | |||
Vee butt weld approximately 12mm | m | 90 min | |||
Vee target weld over 12mm, up to 16mm | m | 150 min | |||
Extra value for backing strip to joins in SHS | join | 7.5 min | |||
Extra value for backing strip to joins in CHS | join | 30 min | |||
Hit and miss stitch 6mm fillet weld | m | 10 min | |||
Miscellaneous | |||||
H.D. Bolt assembly right into pairs | pairs | 6 min | |||
Unload and stack inwards steel, and load out fabricated steel | tonne | 1.5 hr | 1.25-2 hr | ||
onto trucks | |||||
Productivity factors—against the constants above | |||||
General: market, complexity or regional | 0.85-1.33 | ||||
Site fabrication and also welding | 2.00-4.00 |
Man-hours per ton structural steel
Fabrication man-hours are established by the quantity of hours/tasks in each stole assembly, for example, each column, beam, brace, assembly, or bracket. The mean constants are for high repeat portal frame and also high rise kind work. The arrays are for distinctions in item size, detail, repetition, and fabrication methods. This constants are based upon conventional fabrication approaches used by many fabricators, ie manual gas cutting and magnetic broach drilling, and also semi-automatic "mig" or "flux core" welding. V semi-automated saw and also drill lines calculation is much greater but device costs room higher, and also generally the industry does not identify costs since semi-automation affect only part of all at once fabrication. The constants incorporate for reading fabrication drawings, stacking and sorting materials, noting out, turning, grind edges and welds, operator setting up, servicing gear such as welders and also grinders, and QA consisting of average rework. These constants room "whole that job", and hence will differ from spot check times which will certainly not it is in representative that a finish job because of the tendancy no to incorporate downtime and variances in productivity. Repetition affects productivity in different ways, and for some work operations can have a far-ranging impact on output, while various other labours develop only slim improvements. A high level of difficulty can likewise have a large impact on output, for example, an extremely detailed drawings, angled assembly, short repetition of detail, complex set out.