B 68
[Subsidiary]
Bolts.
Rivets and riveting. L.N. 294/76.
CAP. 123] Building (Construction) Regulations
(b) where rust-resisting steels are used; and
[1985 Ed.
(c) where galvanizing or other special provision is made against corrosion.
109. (1) Bolts shall be provided with washers under the nuts so that no part of the threaded portion of any bolt is within the thickness of the parts bolted together.
(2) Shanks of bolts shall project at least 1 full thread beyond the nuts which shall be so secured as to avoid the risk of their becoming loose.
(3) The heads of nuts and bolts shall have a true bearing and taper washers shall be provided where necessary to give that bearing.
(4) The provisions of regulation 110 relating to rivets shall apply to bolts.
110. (1) The distance from the edge of a rivet hole to the edge of the plate, bar or member shall be not less than-
(a) the diameter of the rivet, for rolled edges; and
(b) the diameter of the rivet plus 6 mm, for sheared edges.
(2) Rivets shall be so spaced that their centres shall not be closer together than 3 times the diameter of the rivets.
(3) Subject to the provisions of paragraph (7), straight line pitch in riveted beams, columns or other members shall not exceed 16 times the thickness of the thinnest outside plate, with a maximum of 150 mm for parts in compression and 200 mm for parts in tension.
(4) Where 2 rows of staggered rivets occur in 1 flange of a single angle, the straight line pitch in the direction of stress shall not exceed 1 times the distance specified in paragraph (3) in each line.
(5) Where 2 or more flange plates are used, the edge distance from the centre line of the nearest rivets connecting the plates to the web construction, shall not exceed 12 times the thickness of the thinnest outside plate, and where that edge distance exceeds 9 times that thickness, tacking rivets shall be introduced connecting those flange plates together.
(6) Where a single flange plate is used, the edge distance referred to in paragraph (5) shall not exceed 9 times the thickness of that plate.
(7) Where tacking rivets are used, the straight line pitch shall not exceed 24 times the thickness of the thinnest outside plate or 300 mm, whichever is the lesser dimension.
(8) Where a tension member is composed of 2 angles back to back, the pitch of tacking rivets shall not exceed 1000 mm, and