Example of junction plate design

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nent above-water anchors, such as rock islands, sheet-pile cells,

and timber and rock cribs can be used. These above-water anchors

provide the added benefit of increasing the overall stability of a

sheet ice cover.

Anchor lines are generally made of wire rope. However, if the

boom is being used in a large water body with commercial navi-

gation, anchor lines of high strength anchor chain may be prefer-

able, because a chain being more flexible will lie on the bottom

without coiling. Furthermore, a chain is more resistant to abrasion

if the bottom is rocky.

If the boom has midstream anchors, a junction plate must be

used to connect the two boom cables to the single anchor cable.

Because these junction plates must be designed for high loads,

they usually require additional flotation to support their weight

and prevent the boom from submerging near the anchor attach-

ment points. This additional flotation is also needed to support

parts of the submerged weight of the anchor cable and the adja-

cent boom cables. Figures 8 shows a typical junction plate design,

and Figure 9 shows a typical junction plate and float arrange-

ment.

8. Example of junction

plate design. Note the

reinforcing steel plates

welded to each side of

the three holes.