Civil engineer guide to fighting positions, shelters, obstacles

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AFH 10-222 Volume 14 1 August 2008 64 3.3.2.2. Second Layer. The second layer of the ISO bunker also requires three sections of containers (nine bays per section). Note that the material needed to construct the second layer is identical to the material needed to construct the base layout. This is because the second layer must be perfectly aligned with the first layer. Once again, begin by collapsing one of the three sections (nine bays) to make a section that equates to eight bays. Take another section (nine bays) and separate it into two separate sections consisting of four bays. Align these sections as illustrated in Figure 3.9, ensuring the flaps at the bottom are folded out. Once the layout is complete for the second layer, connect the plastic ties between the first and second layers, and begin filling the units using the proper fill procedures previously described. Figure 3.9. Second Layer – ISO Bunker.
AFH 10-222 Volume 14 1 August 2008 65 3.3.2.3. Roof Support. Once the second layer is complete, begin preparing the roof support. To support the roof structure, four 18-foot, U-shaped sheet pilings are required. Place two pieces of the sheet pilings end-to-end on top of each of the sidewalls of the structure as illustrated in Figure 3.10. Ensure the panels are centered on the sidewalls. Other materials such as 6- by 6-inch lumber can be used in lieu of sheet pilings for roof support if approved by an engineer with experience in structural analysis. This structure will be depended upon to shield personnel from attacks, and its structural integrity cannot be overemphasized. For this reason, any tendency to improvise materials or procedures during construction should be avoided. Figure 3.10. Roof Support — ISO Bunker.
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Civil engineer guide to fighting positions, shelters, obstacles

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