Alternative Support Systems for Cantilever - National Transportation ...
Alternative Support Systems for Cantilever - National Transportation ...
Alternative Support Systems for Cantilever - National Transportation ...
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This option does have some disadvantages as well. The construction will be more tedious<br />
and time consuming than the current connection option. This connection can be more costly than<br />
the current connection option because of the increase in number of elements as well as the cost<br />
of each element. The inclusion of grout adds an additional complication <strong>for</strong> design and<br />
construction error. The viability of a concrete monopole <strong>for</strong> cantilever use is also questionable.<br />
The horizontal member that needs to be attached <strong>for</strong> sign/signal purposes may be too large to<br />
attach to the concrete monopole. This connection may be more difficult to monitor and repair<br />
than a visible connection.<br />
following:<br />
Design strength considerations <strong>for</strong> this connection include, but are not limited to, the<br />
• Breakout strength (of embedded section on concrete foundation)<br />
• Grout strength<br />
• Torsional strength<br />
• Flexural strength<br />
• Monopole to horizontal member connection<br />
6.2.7 Embedded Steel Pipe and Hoops with Grouted Slip Base Connection<br />
This option entails using a steel pipe and hoops embedded into the foundation and stubbing<br />
out from the foundation. The steel pipe and hoops would then be covered by a concrete<br />
monopole and pressure grouted into place. See Figure 6-8 <strong>for</strong> this connection configuration.<br />
The primary benefit of this connection is that it removes the fatigue-prone elements of the<br />
current anchor bolt and annular base plate connection. It offers good torsional and flexural<br />
resistance with the embedded pipe and hoop section. The pipe and hoop section may be<br />
expensive to fabricate. The pressure grouting has the potential to be a problem during<br />
construction as it has been a problem in the past. As mentioned earlier, the concrete monopole<br />
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