Figure 8-46. Umbrella-type deck support in place

TM 5-5430-209-12

(3) As the pole is raised, attach block and tackle

(10) Raise and install a 2-by 12-inch by 12-foot

to the head block eye.

long plank on top of the deck support. Lash both ends

(4) Push the bottom of the pole clear of the

of the plank to the support. The plank is a temporary

inside face of the bottom flange of top center support

platform for personnel during the installation of the first

(1). Drop the foot spike through bolthole (5, fig. 8-45).

five or six deck sections.

(5) Adjust the adapter so that the pole stands as

(11) Remove timber (6, fig. 8-45) and lower it to

nearly vertical as possible.

the tank bottom.

(6) Place a 4-by 6 inch by 10-foot long timber

(12) Attach remaining braces (2, fig. 8-39) to the

(6) under the girth ring of deck support (1). Lash both

ring (1).

ends of the timber to the ring.

(13) Assemble sufficient lengths of bolt channel

(7) Apply lashing (8) around timber (6) at the

(1, fig. 8-49) to span the radius of the tank. Install about

midpoint of the timber and support (1).

seven braces (6, fig. 8-53) around the tank. Adjust the

(8) Attach guy lines (7) to deck support (1) and

braces so that the distance between the tank wall and

position as shown in figure 8-45. Use the lines to aline

the ring is the same where the braces are attached.

g. Installing the Center Pole Boom.

support (1) over the top of top center support (1, fig. 8-

44).

(1) To install the deck sections, assemble the

(9) Attach a lower tackle block hook to lashing

center pole boom components provided in the storage

(8, fig. 8-45). Raise support (1) until it clears the top of

tank erection outfit.

the top center support. Line deck support (1) over the

(2) Use gin pole (4, fig. 8-45) and install the

top of the top center support with guy lines (7), and

boom (3, fig. 8-52) in the top center support. Remove

lower the deck support to final position on the support

the gin pole and adapters and install the remaining bolts

angles as shown in figure 8-46.

in the flanges.

Figure 8-46. Umbrella-type deck support in place.

8-27