Abstract: In order to lower the number of individual components in joint connection-systems of planar or three-dimensional trusses of members and joints and further to reduce the frictional surfaces when implementing a member connection and to make possible a controlled prestressing force, the pipe members 10 comprise member-endpieces 14 with a borehole 16 passing a tap bolt 12 followed inward by a threaded borehole 17 into which is rotated a prestressing muff 18 with an outer thread. When the tap bolt 12 is screwed into a threaded borehole 13 of a joint-adapter 11, the inside end face of the member-endpieces 14 forms a stop for the head 26 of the tap bolt 12. A non-circular segment 23 with flats 25 to seat a corresponding rotating tool is provided to rotate the tap bolt 12 into a threaded borehole 13 of a joint-adapter 11.