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A typical helical unit is shown below in figure 1.1. This unit consists of a central steel shaft or lead section, to which can be attached one or more steel helices (helix). The central shaft can be lengthened by adding extension pieces as necessary.
These extension pieces are connected using the bolted coupling. Pipe shafts are seldom less than about 3 inches in diameter. If necessary, shafts greater than 12 inches in diameter are used.
The final component to the helical unit is the Load Transfer Device (LTD). This unit transfers the tension or compression load from the structure to the helical unit. New Construction LTD (shown in figure 1.1) and LTD for underpinning (shown in figure 1.2) are two of the many LTD’s available. Please view our Design Manual and Product Catalog to see our full line of quality products.
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