77
fi g. 5.33
5 - M
AST
AND
M
AST
T
IES
Masts and Mast Ties
0 to 30-degree
UPPER
angle
0 to 30-degree
LOWER
angle
OR
Maximum 30-degree angle
UP from horizontal
Mast tie male
section
Mast tie
extension
Mast tie female
section
Floor ties must be able to sustain
1500 lb (680 kg) of tension/compression
and 3000 lb (1361 kg) of shear force.
Calculation of a mast tie angle
12" (30 cm)
12" (30 cm)
1" (2,5 cm)
7" (18 cm)
A 5-degree slope
represents a 12" to 1"
(30 cm to 2,5 cm) ratio
A 30-degree slope
represents a 12" to 7"
(30 cm to 18 cm) ratio
Angled Mast Ties
OR
OR
Mast tie attachment
assembly with 30-degree
mast tie kit
1-
Remove the linch pin and clevis pin joining the two parts of the mast tie assembly
together.
2-
Insert the male part of the mast tie assembly into an optional mast tie extension.
Secure with a clevis pin and a linch pin.
3-
Insert this new assembly into the female part of the mast tie assembly. Secure with
a clevis pin and a linch pin.
4-
Pin the required straight mast tie to the mast tie attachment using a clevis pin and a
linch
pin.
5-
Pin the straight mast tie to the fl oor tie and adjust its length until the mast is perfectly
plumb on the front axis. Use the threaded rod and the pin for adjustment, leaving a
maximum length of threaded rod inside the mast tie tube for added strength. Floor
ties must be able to sustain 1500 lb (680 kg) of tension/compression and 3000 lb (1361 kg)
of shear force.
6-
Repeat steps 1 through 5 to install the other
two
required mast ties at a 25° angle
(fi g. 5.20, p. 74) and use the threaded rods to adjust their length until the mast is
perfectly plumb on the side axis.
Installation of extended mast ties
Maximum 30-degree angle
DOWN from horizontal
