Wedges should be of softwood, preferably fir or
yellow pine. They should be cut with a coarse saw and
left rough and unpainted. This allows the wedges to
absorb water and hold better than if they are smoothed
or painted. A few hardwood wedges should be kept on
hand for special uses, since they resist crushing better.
However, hardwood wedges cannot be used for all
Figure 8-9. Use of a shole.
shoring because they have a tendency to work loose.
When hardwood wedges are used, they must be
All or part of an ordinary shore may be used to
Wedges should be approximately the same width
make a strongback. Shoring scraps should be kept for
as the shores with which they are used. They may be
use as strongbacks and short shores. Heavy planks,
made with various angles at the leading edge, but a
steel bars, angle irons, and pipe can also be used as
blunt wedge will not hold as well as a sharp one. A
strongbacks (fig. 8-6).
wedge should be about six times as long as it is thick.
Thus a wedge to be used with a shore that is 4 by 4
Several types of telescopic steel shores are used to
inches should be about 4 inches wide, 2 inches thick,
make temporary repairs and some may be used for
and 12 inches long. Figure 8-8 shows some wedges and
immediate repairs. The metal shores normally will
shows how they are used.
have pins or locking devices and are fitted with a
hinged shoe at each end. The pins or locking devices
are used to adjust the length of the shore. The hinged
shoe may be easily adjusted to any angle and then
5 TO 6X
welded in place. The newer types of metal shores
2 WEDGES FROM
TAPER OF WEDGE
(fig. 8-10) are also fitted with screw jacks or swivel
USE BLOCK FOR DRIVING
DRIVE FROM BOTH
Figure 8-8. Wedges.
Figure 8-10. Steel shore supporting overhead deck or load.
Sholes should be made of Douglas fir or yellow
pine planks that are at least 1 inch thick and 8 inches to
The newer steel shores are available in two models
12 inches wide. Nailing cleats across two or more
widths of planking can make wider sholes. A single
1. Model 3-5 is adjustable from a minimum of
plank may have to be cleated at the ends to keep it from
3 feet, plus or minus 3 inches, to a maximum of 5 feet,
splitting. Do not fabricate sholes in advance of the
plus or minus 3 inches. It will support a maximum
actual need for them; prefabricated sholes would
vertical load of 20,000 pounds when closed to within
probably not fit where they are needed. The use of a
1 inch of the screw jack. It will support a maximum
shole is shown in figure 8-9.
vertical load of 12,000 pounds when fully extended.