SECTION B - Derry City Council

indicating washer on the bolt, and the method of tightening and
measurement, shall be strictly in accordance with the
manufacturer's recommendations. A plain hardened steel washer
shall be used under the part of the bolt being turned during
tightening operations.
Irrespective of the tightening procedure, the Steelwork Sub-
Contractor shall provide the Engineer with a Schedule of all HSFG
bolts to be used on the Contract. This schedule should indicate the
location of each bolt and the type of fabrication into which it is fitted.
After final tightening of bolts the schedule must be signed by the
Steelwork Sub-Contractor's erection supervisor. A copy of the
completed bolt schedule must be forwarded to the Engineer for
record purposes. If after final tightening, a nut or bolt is slackened
off for any reason, the bolt, nut and washer or washers shall be
discarded and not used again.
The Steelwork Sub-Contractor is to take all necessary precautions
to ensure the stability and safety of the steelwork structure during
erection and shall maintain any special temporary guying or other
supports until the structure is completed, and the Steelwork Sub-
Contractor shall be entirely responsible for any accidents which may
arise from lack of suitable precautions.
Extra care shall be exercised by the Steelwork Sub-Contractor
when handling steelwork which is metal sprayed, galvanised or
coated with anti-corrosive paint treatment. In order to avoid
damage to these coatings padded slings should be used for lifting
the steelwork. Temporary timber packers and spacing members
shall be used extensively during transport, storage and erection, in
an effort to reduce the possibility of damage to the treated surfaces
of the steel.
Zinc or Cadmium plated bolts, nuts and washers shall be used in
the assembly and erection of all galvanised or specially treated
steelwork.
11 SETTING OF STEELWORK
Unless otherwise specified stanchion bases are to be set on the
concrete on steel wedges leaving a nominal gap of 40 mm and
when the steelwork has been accurately levelled and aligned the
space beneath will be filled by the Main Contractor with fluid
Portland Cement mortar.
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