You have been asked to design a scaffolding system for an existing building that has a...

 

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You have been asked to design a scaffolding system for an existing building that has a deteriorating brick wall that is 105 ft long by 82 ft tall. Your construction company needs to tuck-point the mortar joints where mortar has become loose or is missing and replace broken or softened bricks. The schedule requires you to set up scaffolding for the whole length of the wall all in one build so you can maximize your crew size and minimize your time on site. • You have a nearly level ground surface but it is not hardscape (such as concrete or pavement). You must place your scaffolding in a strip of ground that can only support a load of not more than 3,000 psf. • Scaffolding has a width of 5 ft for 105 ft and each scaffold bay is 7 ft long. • There are 12 working levels (all above finished grade occurring every 6"-6" in elevation) with a handrail around the top level. • There is enough brick deteriorated that the whole wall will on average need (4) - flats of new brick to replace bad bricks. A½-flat of brick weighs 1,000 lbs and takes up a footprint of 3'-4" x 4'-0" in plan. Assume that the brick pallet can be placed such that the 4 ft dimension is parallel to the wall. • Assume that for each level and at each bay on that level the wall will require (2) tubs of mortar weighing 100 lbs each for the tuck-pointing. Assume a tub requires an area of 1'-0" x 1'-0" next to a worker, not in the same workspace. • Assume a worker plus their hand tools weighs 250 lbs each and needs a plan area of 3 ft x 3 ft on the scaffold to work in AND they all have to have 3 ft of wall face to tuck-point. • For the sake of this assignment ignore the weight of the scaffolding system. You would normally have to account for it as well. 2a. Bays with 1/2-flat of brick on them: How many workers can work on a 5 ft wide x 7 ft long bay that also has (1) --flat of bricks on it? 2b. Bays without 2-flat of brick on them: How many workers can work on a 5 ft wide x 7 ft long bay that has (3) tubs of mortar on it but no 2-flat of brick? Is this limited by space or by the load capacity? Why might I want to plan for (3) tubs of mortar instead of only the required (2) tubs per bay? You have been asked to design a scaffolding system for an existing building that has a deteriorating brick wall that is 105 ft long by 82 ft tall. Your construction company needs to tuck-point the mortar joints where mortar has become loose or is missing and replace broken or softened bricks. The schedule requires you to set up scaffolding for the whole length of the wall all in one build so you can maximize your crew size and minimize your time on site. • You have a nearly level ground surface but it is not hardscape (such as concrete or pavement). You must place your scaffolding in a strip of ground that can only support a load of not more than 3,000 psf. • Scaffolding has a width of 5 ft for 105 ft and each scaffold bay is 7 ft long. • There are 12 working levels (all above finished grade occurring every 6"-6" in elevation) with a handrail around the top level. • There is enough brick deteriorated that the whole wall will on average need (4) - flats of new brick to replace bad bricks. A½-flat of brick weighs 1,000 lbs and takes up a footprint of 3'-4" x 4'-0" in plan. Assume that the brick pallet can be placed such that the 4 ft dimension is parallel to the wall. • Assume that for each level and at each bay on that level the wall will require (2) tubs of mortar weighing 100 lbs each for the tuck-pointing. Assume a tub requires an area of 1'-0" x 1'-0" next to a worker, not in the same workspace. • Assume a worker plus their hand tools weighs 250 lbs each and needs a plan area of 3 ft x 3 ft on the scaffold to work in AND they all have to have 3 ft of wall face to tuck-point. • For the sake of this assignment ignore the weight of the scaffolding system. You would normally have to account for it as well. 2a. Bays with 1/2-flat of brick on them: How many workers can work on a 5 ft wide x 7 ft long bay that also has (1) --flat of bricks on it? 2b. Bays without 2-flat of brick on them: How many workers can work on a 5 ft wide x 7 ft long bay that has (3) tubs of mortar on it but no 2-flat of brick? Is this limited by space or by the load capacity? Why might I want to plan for (3) tubs of mortar instead of only the required (2) tubs per bay?

Answer rating: 100% (QA)

2a For a bay that has 1 flat of brick on it Weight of flat of brick 1000 lbs Weight of 2 tubs of mortar 2 100 lbs 200 lbs Total weight on the bay 1000 ... View the full answer