Civil Engineering Reference
In-Depth Information
The Split-Ring Connector
The split-ring connector joint is illustrated in Fig. 4.2. The principle is similar to that in
the double-sided tooth plate, in that the split-ring carries 75% of the load, the bolt 25%
and maintains the timbers in position around the ring. The problem of embedment of the
connector is solved by machining a circular groove equal to half of the width of the ring in
each meeting timber surface. This groove is machined using a special 'dapping' tool avail-
able from the connector suppliers. Assembly of the split-ring connector jointed truss is
similar to that for the design described above, but clearly all of the grooves for the rings
must be machined before any final assembly takes place. The high tensile stud is clearly
not required as the ring fits neatly into the groove allowing the final bolt to be placed
through on the first assembly. The split-ring connector truss assembly is most likely to be
carried out in a workshop where the dapping procedure can be carried out in fixed drilling
jigs on benches. Dapping can be carried out on site but electric power to turn the dapper is
almost essential, and a degree of skill is required in its accurate use. The bolt holes must
be drilled first; the dapping tool is then located in the bolt hole to cut the groove for the
connector.
Site assembly of bolt and connector jointed trusses using either connector form is of
course a practical proposition, but factory assembly of the truss will generally result in a
