Question

The plumbing subcontractor is significantly behind schedule and has requested the use of a mobile scissor lift on the elevated slab portion of the project. Your superintendent has indicated that he needs to check with you, as project manager, before allowing this. The contact area of the lift is 32" x 62". The lift weighs 1,100 pounds and has a load capacity of 500 pounds. The design load of the elevated slab is 100 psf. What is your recommendation? 13.

Answer 1

load of lift = 1100 ponds

load capacity = 500 pounds

total load = 1100+500=1600 pounds

Contact area = 32X62=1984 inches square = 1984/144 square feet=13.7778 square feet

bearing load = 1600/13.7778 = 116.13 pounds per square feet

this load it can take

but design load is mentioned 100 psf only which can easily be taken by the lift.

Hence its safe lift and can take load of 100 psf easily