Figure 3-18. Dressed top chime of staves

TM 5-5430-209-12

(2) Install 2-by 12-inch planks (3) on brackets

b. Insert wedge gasket (2) underneath strip gasket

(1). Planks must be sound and of sufficient length to

(1) at each lap formed by adjoining staves.

overlap 2 feet at each end.

c. Insert L/2-by 1-inch bolts (3) through chime and

(3) Use No. 10 soft iron wire (4) or rope and

gasket, in that order. Gasket material will hold the bolts

lash plans (3) to brackets (1).

in place.

(4) Install a footwalk post (5) on each bracket.

Post is clamped and pinned to bracket.

(5) Thread two 1/2 -inch manila rope rails (6)

in posts.

WARNING

Install a guard rail on all scaffolding

for personnel protection.

3-9. Dressing Top Chime

a. Use scaffold and install strip gasket (1, fig. 318)

to cover all bolt holes. When one roll of gasket material

is expended and a new roll started, the overlap should

extend over two bolt holes. Apply sealing compound at

each end of overlap.

1. STRIP GASKET

2. WEDGE GASKET

3. BOLT

Figure 3-18. Dressed top chime of staves.

Section III. ASSEMBLY AND INSTALLATION OF CENTER SUPPORT LADDER

3-10. General

3-11. Assembly of Ladder

a. Place left ladder support rail (1, fig. 3-19) and

The ladder consists of a bolted, steel angle section. The

top of the ladder is fitted with a manhole dome. Small

right ladder support rail (2), with similar bolting legs

ends of the deck plates are bolted to the bottom flange

facing each other, on top of several pieces of blocking

of the manhole cover.

3-16