1985 Ed.]
Building (Construction) Regulations
[CAP. 123
where a compression member is similarly composed the pitch shall not exceed 750 mm, or 40 times the least radius of gyration of either angle, whichever be the lesser dimension:
Provided that tacking rivets on the connected legs of angles may be staggered.
(9) In paragraphs (7) and (8) “tacking rivets" means rivets connecting flange plates together, but not being subject to calculated stress.
111. (1) Notwithstanding the provisions of regulations 103(3) and 112(2), welded construction may be used and shall be carried out in conformity with the appropriate provisions of BS 5135:1974,
(2) Due account shall be taken in the design of the effects of any rigidity attributable to welding.
(3) The Building Authority may require the employment of properly qualified welding supervisors and welders with approved qualifications for the type of work required as specified in Chapter 6 BS 449:Part 2:1969 for the execution of welded construction.
(4) During construction, the Building Authority may require from time to time non-destructive tests to be carried out on the welded structure.
112. (1) As much of the work of fabrication of all steelwork as is reasonably practicable shall be completed in the works where the steelwork is fabricated.
(2) Except as provided in paragraphs (3) and (4), rivets or turned bolts of driving fit shall be used for all work of fabrication and for field connexions.
(3) Black bolts may be used in cases where no adverse effects on the structure would result from slipping of the bolts, and where suitable dead bearings formed by seating plates, packings, brackets or the like are provided to resist the whole of the shear forces involved.
(4) The requirements of paragraph (3) as regards dead bearings shall not apply to-
(a) roof trusses;
(b) the end connexions of secondary floor beams; or
(c) where, having regard to the particular circumstances of the case, the Building Authority is satisfied that dead bearings may be omitted.
(5) Bedding of column bases and bearings of beams and girders shall be carried out with Portland cement grout or mortar, or fine concrete in accordance with the requirements of clause 76 a BS 449: Part 2:1969.
B 69
[Subsidiary]
Welding. L.N. 294/76.
Fabrication and erection.
L.N. 294/76.