Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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Shores and Scaffolding 169
FIGURE 6-3 Single-post steel shore. (Source: Symons Corporation)
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Symons post shores each carry load ratings of up to 10,000 lb, depending
on the shore height.
The Symons post shores have a unique locking pin that, under normal
use conditions, cannot be easily broken or lost. For approximate
height adjustment, this pin is inserted into one of the holes spaced at
4-in. intervals along the length of the staff. A safety pin secures the locking
pin and eliminates accidental slippage of the base and staff. After
the post shore has been set in position, a threaded collar with handle
permits fine adjustment of the post shore height over a 6-in. range.
To support 4-in. stringers, or 8-in. wide flange stringers, a 4-in. by
8-in. U-head is inserted into the top of the post shore staff. The U-
head is inserted through the end plate hole on the shore and attached
by a ½-in.-diameter attachment pin and a ¹⁄8-in.-diameter hairpin
clip. Nail holes on the side of the U-head provide a convenient means
of securing lumber stringers. A steel beam clamp should be used to
secure the steel stringers to the U-head.
A 5-in. by 8-in. J-head is also available for quick installment under
aluminum beam stringers. The J-head must be pinned to the top of
the post shore using the ½-in.-diameter attachment and hairpin clip.
A steel beam clamp or aluminum attachment clip assembly should be
used to secure the aluminum beam to the J-head.
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