FujiClean CE, Руководство по установке

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13
Uplift Restraint
Uplift restraint is an occasional requirement because of the many locations that experience high seasonal
or tidal groundwater. Alternative uplift restraint procedures and techniques and methods are available,
some more appropriate than others depending on site-specific conditions. A common technique used by
engineers to calculate uplift restraint requirements is the “Soil Wedge” approach, which relies on the
weight and frictional force a “soil wedge” exerts against a concrete block, is illustrated below. Designers
are encouraged to consider site-specific conditions when selecting an uplift restraint procedure and
technique for any specific installation.
Figure 8 - Soil Wedge Approach for Uplift Restraint
The soil wedge approach considers that soil will exert uplift resistance against a hold-down concrete
block. The magnitude of this force will consist of five components: tank weight, saturated weight of the
concrete block, saturated weight of the soil column directly above the block, saturated weight of the soil
wedge between the soil column and failure plane, and the frictional force along the failure plane. This
approach assumes that there are no moments because opposing lateral forces will cancel themselves;
only vertical forces will act on the blocks. Each is shown in the diagram.
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Step 4: If any part of the tank is below the estimated seasonal high water table, then engineer shall
provide design to assure adequate tank uplift restraint. Please contact FujiClean USA for additional
information.
One technique used for uplift restraint calculations is introduced below.