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

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Shores and Scaffolding 167
FIGURE 6-1 Ellis shoring system. (Source: Ellis Construction Specialties, Ltd.)
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The patented Ellis clamp is designed with a solid rectangular collar
with two pivotal plates, which are scorated on the flat inner surface
for firm gripping. Two clamps nailed 12 in. apart near the top of
a 4 × 4 make a lower shore member. The upper shore member is
another 4 × 4 of desired length.
Figure 6-1 illustrates the Ellis shoring system, including the recommended
spacing pattern for the indicated forming condition. The
manufacturer recommends a maximum load of 4,000 lb for heights
up to 12 ft, provided a horizontal lace is installed in each direction at
the midpoint on the shore, attached to the lower member. For lower
heights, higher loads may be obtained in accordance with the manufacturer’s
recommendations. The lower shore member, with two
clamps attached, is available for rent from the company.
Accessories are available for installation of the Ellis shoring system.
Figure 6-2 shows accessories for the tops and bottoms of shores. A
wire head, configured from a ½-in. rod, is used to securely hold the
shore to the purlins. A metal attachment, fabricated from 4-in.-square
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