MASONRY. THE HISTORY OF MASONRY DATES BACK TO THE EGYPTIAN PYRAMIDS, THE COLISEUM IN ROME, AND THE GREAT WALL OF CHINA.

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Presentation transcript:

MASONRY

THE HISTORY OF MASONRY DATES BACK TO THE EGYPTIAN PYRAMIDS, THE COLISEUM IN ROME, AND THE GREAT WALL OF CHINA

SUN-BAKED CLAY BRICKS WERE USED IN THE CONSTRUCTION OF BUILDINGS MORE THAN 6,000 YEARS AGO

THE SKILL AND PRECISION OF THE MASON CAN NEVER BE REPLACED BY MACHINES

Construction of Brick/block  Brick is composed of shale and clay.  Brick is fired in kilns of approximately 2,000º F.  Concrete blocks are composed of cement, sand, and lightweight aggregate.  When exposed to fire, masonry does not burn, melt, twist or warp.

Job Data

 Each brick weighs 4.4 +/- lbs.

Job Data  Each brick weighs 4.4 +/- lbs.  Brick “Tongs” weigh 4 lbs. and carry normally 11 brick at a time. Normally two tongs of brick are carried at one time

Job Data  Each brick weighs 4.4 +/- lbs.  Brick “Tongs” weigh 4 lbs.  1 short wall = 3 mortarboards with 960 brick (4 high/2 deep).

Job Data  Each brick weighs 4.4 +/- lbs.  Brick “Tongs” weigh 4 lbs.  1 short wall = 3 mortarboards with 960 brick (4 high/2 deep).  Total weight of brick = 4224 lbs

Job Data  Mixing mortar = 70 lbs. Mortar mix, 18 shovels of sand & 5 gallons of water.  Each shovel of sand weighs approx. 6-8 lbs., total weight = 144 lbs.  Water weight = lbs.  Total weight of mortar in wheelbarrow = 255 lbs.

Strength Data  Right finger 2 nd digit and thumb = 30  Left finger 2 nd digit and thumb = 27  Right 90 degrees = 130 lbs.  Right 180 degrees = 150 lbs.  Left 90 degrees = 160 lbs.  Left 180 degrees = 145 lbs.

Identification of Risk Factors

Static posture

Awkward postures

Static muscle loading

Contact Stress

Force of movements

Repetition

Environment

Static movement

Awkward posture/pivoting

Vibration

Questions???