405.7 Landings. Ramps shall have landings at the top and the bottom of each ramp run. Landings shall comply with 405.7. Advisory 405.7 Landings. Ramps that do not have level landings at changes in direction can create a compound slope that will not meet the requirements of this document.
When was the I-405 freeway built?
Construction on I-405 (the “Sepulveda Freeway”) in West Los Angeles begin in 1954. CHPW noted in November-December 1953, “Los Angeles County, structures on the route of the Sepulveda Freeway, between Waterford Street and Casiano Road in West Los Angeles, $800,000 (first construction on the Sepulveda Freeway).”
What is an extended surface on a handicap ramp?
The extended surface prevents wheelchair casters and crutch tips from slipping off the ramp surface. 405.9.2 Curb or Barrier. A curb or barrier shall be provided that prevents the passage of a 4 inch (100 mm) diameter sphere, where any portion of the sphere is within 4 inches (100 mm) of the finish floor or ground surface.
What is the maximum slope for a handicap ramp?
Ramp runs shall have a running slope not steeper than 1:12. EXCEPTION: In existing sites, buildings, and facilities, ramps shall be permitted to have running slopes steeper than 1:12 complying with Table 405.2 where such slopes are necessary due to space limitations. 1. A slope steeper than 1:8 is prohibited.
What is the difference between circular and curvilinear ramps?
Circular or curved ramps continually change direction. Curvilinear ramps with small radii also can create compound cross slopes and cannot, by their nature, meet the requirements for accessible routes. A level landing is needed at the accessible door to permit maneuvering and simultaneously door operation. 405.7.1 Slope.
What is the length of an extended floor on a ramp?
405.9.1 Extended Floor or Ground Surface. The floor or ground surface of the ramp run or landing shall extend 12 inches (305 mm) minimum beyond the inside face of a handrail complying with 505. Advisory 405.9.1 Extended Floor or Ground Surface.
