There is a normal lordosis in the upper (cervical) spine and the lower (lumbar) spine. People with scoliosis develop additional curves to either side of the body, and the bones of the spine twist on each other, forming a C or an S shape in the spine. Scoliosis is about two times more common in girls than boys. It can be seen at any age, but it is most common in those over about 10 years of age. Scoliosis is hereditary in that people with scoliosis are more likely to have children with scoliosis; however, there is no correlation between the severity of the curves from one generation to the next.
The final rule requires that employers inspect walking-working surfaces regularly and as needed and correct, repair, or guard against hazardous conditions; and Training (Â§1910.30).
Edging will compact the concrete next to the form where floating and troweling are less effective. This will make the edge of the slab more durable and less likely to chip. Edging tools have a curved lip that forms the edge. These curved lips range in depth from 1/8â -1 Â½â and in radius from 1/8â â 1â. For Driveway, sidewalks, and patios use a this lipped edger with a Â½â radius. In the case of joints subject to vehicle traffic, use a radius of 1/8â.