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

168 Chapter Six
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FIGURE 6-2 Accessories for wood shores. (Source: Ellis Construction Specialties, Ltd.)
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tubing and 3 ⁄16-in. U-configured steel plate, can be permanently attached
on the top of the upper shore member, which serves as a purlin splicer.
One side is open, allowing it to be stripped from below.
Screw jacks can be installed under the lower shore member, allowing
adjustments of the shore height to the correct position. Adjustment
handles turn easily on machined threads, allowing a 6-in. standard
range of adjustment, 3 in. up and 3 in. down. The screw jack has a safe
working load of 10,000 lb with a 2.5:1 safety factor.
A reshore spring, made of high-carbon spring steel, is available to
hold the Ellis shore in place during reshoring. It is used to keep the
shore tight against the slab during reshoring concrete slabs. The reshore
spring is nailed to the top of each shore, eliminating the need for cutting
and nailing lumber to the top and bottom of each shore. The
spring returns to its original shape for many reuses. A 200-lb load will
compress the reshore spring flat.
Symons Shores
The single-post steel shores of the Symons Corporation, illustrated in
Figure 6-3, are available in three models which provide adjustable
shoring heights from 5 ft 7 in. to 16 ft. Each post shore consists of two
parts: a base post with a threaded collar and a staff member which fits
into the base post. The assembly weight of a single-post shore varies
from 67 to 80 lb, which permits a shore to be handled by one person.
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