Structural beam joint, comprising: a first structural beam having a web portion, a top flange portion a bottom flange portion (23; 24), wherein the bottom flange portion is made up from a flange portion outside a joint area with a second structural beam and a first flange portion at the joint area with the second structural beam, wherein the first flange portion at the joint area with the second structural beam is recessed within the web portion with respect to the flange portion outside a joint area; the second structural beam having at least one second flange portion, the second structural beam having an axis of extension being angled with respect to the axis of extension of the first structural beam and intersecting with the first structural beam; at least one beam flange clamp comprising a clamp body having a first vise jaw portion with a first gripping surface, a second vise jaw portion with a second gripping surface, the first gripping surface and the second gripping surface being oriented parallel to each other, facing the same direction and being offset in height by a predetermined clamping distance (d), and at least one bolting hole being formed through the first vise jaw portion perpendicularly to the first gripping surface; and at least one fastening pin or bolt inserted in the at least one bolting hole of the at least one beam flange clamp, the first flange portion of the first structural beam abutting the at least one second flange portion of the second structural beam, and the at least one fastening pin or bolt tightening the clamp body of the at least one beam flange clamp to the first flange portion of the first structural beam at the joint area with the second structural beam so that the first gripping surface of the at least one beam flange clamp presses against the second flange portion of the second structural beam and the second gripping surface of the at least one beam flange clamp presses against the first flange portion of the first structural beam at the joint area with the second structural beam. a first structural beam having a web portion, a top flange portion a bottom flange portion (23; 24), wherein the bottom flange portion is made up from a flange portion outside a joint area with a second structural beam and a first flange portion at the joint area with the second structural beam, wherein the first flange portion at the joint area with the second structural beam is recessed within the web portion with respect to the flange portion outside a joint area; the second structural beam having at least one second flange portion, the second structural beam having an axis of extension being angled with respect to the axis of extension of the first structural beam and intersecting with the first structural beam; at least one beam flange clamp comprising a clamp body having a first vise jaw portion with a first gripping surface, a second vise jaw portion with a second gripping surface, the first gripping surface and the second gripping surface being oriented parallel to each other, facing the same direction and being offset in height by a predetermined clamping distance (d), and at least one bolting hole being formed through the first vise jaw portion perpendicularly to the first gripping surface; and a first vise jaw portion with a first gripping surface, a second vise jaw portion with a second gripping surface, the first gripping surface and the second gripping surface being oriented parallel to each other, facing the same direction and being offset in height by a predetermined clamping distance (d), and at least one bolting hole being formed through the first vise jaw portion perpendicularly to the first gripping surface; and at least one fastening pin or bolt inserted in the at least one bolting hole of the at least one beam flange clamp, the first flange portion of the first structural beam abutting the at least one second flange portion of the second structural beam, and the at least one fastening pin or bolt tightening the clamp body of the at least one beam flange clamp to the first flange portion of the first structural beam at the joint area with the second structural beam so that the first gripping surface of the at least one beam flange clamp presses against the second flange portion of the second structural beam and the second gripping surface of the at least one beam flange clamp presses against the first flange portion of the first structural beam at the joint area with the second structural beam.