梯子平台



Fixed Ladder Design Notes:

Note:Use Client Standards if project required

See Standards for member sizes & additional details

1. The minimum design live load shall be a single concentrated

load of 200 pounds (91Kg).

2. The number and position of additional concentrated live-load units

of 200 pounds (91 Kg) each as determined from anticipated usage of ladder

shall be considered in the design.

3.  All ladders 20 Feet (6096mm) or more in length shall be equipped with safety cage.

Cages shall also be required where the ladder face is within 4'-0" (1219mm)

of an elevated platform edge.

4.  Where ladder face is within 4'-0" (1219mm) of platform edge extend vertical cage

bars to platform handrail.

5. The side access ladder is the preferred to the step through (Front) access style.

6. All fixed ladders serving elevations 2'-6" (762mm) or more above ground, platform

or floor level shall be equipped with drop bar or safety gate attached as follows:

* Side access ladders hinged at ladder side with drop bar.

* Side access ladders opens at ladder side with safety gate.

7.  The distance between rungs shall not exceed 12 inches (305mm) and shall

shall be uniformed throughout the length of the ladder. Any Spacing adjustments

to be at bottom rung to landing.

8.  The maximum distance between landings shall not exceed 30'-0" (9144mm).

9.  All rungs shall have a minimum diameter of 3/4" (20mm) except ladders formed

by individual metal rungs imbedded in concrete use a 1"(25mm) diameter bar minimum.

10. The minimum clear length of rungs shall be 16 inches (406mm).

11. On fixed ladders, the perpendicular distance from the center line of rungs to the

nearest permanent object on the climbing side of the ladder shall be 36 inches (914mm)

for a pitch of 76 degrees and 30 inches (762mm) for a pitch of 90 degrees.

12. A clear width of at least 15 inches (381mm) shall be provided each way from the

center line of the ladder in the climbing space.

13. The distance from the center line of rungs to the nearest permanent object in back

of the ladder shall not be less than 7 inches (178mm) except that when unavoidable

obstructions are encountered - See Detail Clearance for Unavoidable Obstruction

at rear of ladder (Below).

14. The step-across distance from the nearest edge of ladder to the nearest edge of

2-1/2 inches (64mm)

landing shall not be more than 12 inches (305mm) or less than 2-1/2 Inches (64mm)

for front access ladders.

15.  When ladders are used to ascend to heights exceeding 20 Feet (6096mm) landings

platforms shall be provided for each 30 Feet (9144mm) or fraction thereof, except

that, where no cage or ladder safety device is provided, landing platforms shall be

provided for each 20 Feet (6096mm) of height or fraction thereof.

16. Cages shall extend a minimum of 3'-6" (1067mm) above the top of landing,

unless other acceptable protection is provided.

17.  Bottom Cages shall extend down the ladder to a point not less than 7 Feet (2134mm)

nor more than 8 Feet (2438mm) above the base of the ladder or landing.

18. Set top of rung flush with top of landing walking surface

19. Cages shall not extend less than 27" (686mm) nor more than 28" (711mm) from the

centerline of rungs of the ladder. Vertical bar spacing shall be located  at a maximum

spacing of 40 degrees around the circumference of the cage - aprox. 9-1/2" (241mm) c/c