| 摘要 |
Sheet steel pan forms bent or rollformed to specific "universal" profiles allow the manufacture of concrete tread filled steel stairs or precast concrete stairs. The profiles adjust against each other under the specific angle of 26.565 and thereby, used in series, create stairways of various rise and run relations, maintaing the same profile at all times, satisfying requirements of all building codes and follow the measure of the human step on an incline. These "universal" profiles are designed to standardize stair construction, save labor and material and produce stairs more economically than conventional methods employed in today's construction industry. |
