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Culvert End Section "Closed Taper"?

Culvert End Section "Closed Taper"?

Culvert End Section "Closed Taper"?

(OP)
HDS5 Table 12 indicates that an end section with a closed taper in their design can use a Ke of 0.2 rather than 0.5 for sections commonly available from manufacturers.  It appears that the pre-cast concrete end sections in this area have the "closed taper".  Can anyone give me more info on what they are defining as a closed taper or maybe a link to additional info.

Thanks in advance,

swu

RE: Culvert End Section "Closed Taper"?

If I remember correctly, isn't there a detail in the lower left-hand corner of that table of the taper w/ dimensions?  

If so, fax that detail to the precast manufacturer, and ask if they can meet that.

If not, you can get a similar Ke reduction from a bevelled pipe insert into the endsection (versus a square/flush fit).  That table does have a detail, because I've added it to CADD details in the past.  That way, the contractor will build the bevel.

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