Load Capacity – General – Based on Test Results (see Table 4 and 5)

These basic load ratings are for installations where:

1. The shoring system is founded on an unyielding support, i.e. concrete slab, on grade or properly reshored or a sound, stiff soil mudsill system.
2. The formwork or other load being supported provides restraint against translation of the tower tops, and does not introduce lateral forces at the top of the upper jack plates.
3. The towers are installed to tolerances required by CSA S269.1 1975, as quoted below.

NOTE: For towers having to resist lateral loads, see Table 3, Page 40

VARIATION FROM PLUMB

TOLERANCES AS PER CANADIAN STANDARD ASSOCIATION S269.l 1975

Vertical load-carrying members shall be erected and maintained plumb within the following limits:

1. Plumb lines through any two points on the centre line of the vertical members and less than 10 feet apart vertically shall not be separated by more than 1/2 inch.
2. Plumb lines through any two points on the centre line of the vertical members shall not be separated by more than a ratio of 3/4 inch in 20 feet nor exceed 11/2 inches in the length of the vertical member over 40 feet.

NOTE: Configurations with interframe crossbracing are of higher basic capacity than those without; e.g., a single tier high tower has only one set of crossbraces, allowing the frame legs to buckle in the same direction where a 2 frame high tower “INTERBRACED” has three sets of bracing restricts this action. For clarification of inter-frame crossbracing, see Page 5, Figure 3. Also see Load Charts on Page 41.