Annex F(Clause 23.16)

General Recommendations for Steelwork Tenders and Contracts

F-1 General

F-1.1 The recommendations given in this annex are in line with those generally adopted for steelwork construction and are meant for general information.

F-1.2 These recommendations do not form part of the requirements of the Section and compliance with these is not necessary for the purpose of complying with this Section.

F-1.3 The recommendations are unsuitable for inclusion as a block requirement in a contract, but in drawing up a contract the points mentioned should be given consideration.

F-2 Exchange of Information

Before the steelwork design is commenced, the building designer should be satisfied that the planning of the building, its dimensions and other principal factors meet the requirements of the building owner and comply with regulations of all authorities concerned. Collaboration of building designer and steelwork designer should begin at the outset of the project by joint consideration of the planning and of such questions as the stanchion spacing, materials to be used for the construction, and depth of basement.

F-3 Information Required by the Steelwork Designer

a) Site plans showing in plan and elevation of the proposed location and main dimensions of the building or structure;

b) Ground levels, existing and proposed;

c) Particulars of buildings or other constructions which may have to remain on the actual site of the new building or structure during the erection of the steelwork;

d) Particulars of adjacent buildings affecting, or affected by, the new work;

e) Stipulation regarding the erection sequence or time schedule;

f) Conditions affecting the position or continuity of members;

g) Limits of length and weight of steel members in transit and erection;

h) Drawings of the substructure, proposed or existing, showing:

1. levels of stanchion foundations, if already determined;

2. any details affecting the stanchion bases or anchor bolts;

3. permissible bearing pressure on the foundation; and

4. provisions for grouting.

NOTE— In the case of new work, the substructure should be designed in accordance with the relevant standards dealing with foundations and substructure.

j) The maximum wind velocity appropriate to the site (see Section 1 of Part 7 ‘Construction Management, Practices and Safety, of the Code); and

k) Environmental factors, such as proximity to sea coast, and corrosive atmosphere. Reference to bye-laws and regulations affecting the steelwork design and construction.

a) Plans of the floors and roof with principal dimensions, elevations and cross-sections showing heights between floor levels.

b) The occupancy of the floors and the positions of any special loads should be given.

c) The building drawings, which should be fully dimensioned, should preferably be to the scale of 1 to 100 and should show all stairs, fire escapes, lifts, etc, suspended ceilings, flues and ducts for heating and ventilating. Doors and windows should be shown, as the openings may be taken into account in the computations of dead load.

Requirements should be given in respect of any maximum depth of beams or minimum head room.

Large-scale details should be given of any special features affecting the steelwork.

d) The inclusive weight per $m^{2}$ of walls, floors, roofs, suspended ceilings, stairs and partitions, or particulars of their construction and finish for the computation of dead load.

The plans should indicate the floors, which are to be designed to carry partitions. Where the layout of partitions is not known, or a given layout is liable to alteration, these facts should be specially noted so that allowance may be made for partitions in any position (see Part 6 'Structural Design, Section 1 Loads, Forces and Effects').

e) The superimposed loads on the floors appropriate to the occupancy, as given in Part 6 ‘Structural Design, Section 1 Loads, Forces and Effects’ or as otherwise required.

f) Details of special loads from cranes, runways, tips, lifts, bunkers, tanks, plant and equipment.

g) The grade of fire resistance appropriate to the occupancy as may be required.

F-4 Information Required by Tenderer (IF Not Also Designer)

a) All information listed under F-3.1;

b) Climatic conditions at site-seasonal variations of temperature, humidity, wind velocity and direction;

c) Nature of soil. Results of the investigation of sub-soil at site of building or structure;

d) Accessibility of site and details of power supply;

e) Whether the steelwork contractor will be required to survey the site and set out or check the building or structure lines, foundations and levels;

f) Setting-out plan of foundations, stanchions and levels of bases;

g) Cross sections and elevations of the steel structure, as necessary, with large-scale details of special features;

h) Whether the connections are to be bolted, riveted or welded. Particular attention should be drawn to connections of a special nature, such as turned bolts, high strength friction grip bolts, long rivets and overhead welds;

j) Quality of steel, and provisions for identification;

k) Requirements in respect of protective paintings at works and on site, galvanizing or cement wash;

m) Approximate dates for commencement and completion of erection;

n) Details of any tests which have to be made during the course of erection or upon completion; and

p) Schedule of quantities. Where the tenderer is required to take off quantities, a list should be given of the principal items to be included in the schedule.

a) Schedule of stanchions giving sizes, lengths and typical details of brackets, joints, etc;

b) Plan of grillages showing sizes, lengths and levels of grillage beams and particulars of any stiffeners required;

c) Plans of floor beams showing sizes, lengths

PART 6 STRUCTURAL DESIGN — SECTION 6 STEEL

and levels eccentricities and end moments. The beam reactions and details of the type of connection required should be shown on the plans;

d) Plan of roof steelwork. For a flat roof, the plan should give particulars similar to those of a floor plan. Where the roof is pitched, details should be given of trusses, portals, purlins, bracing, etc;

e) The steelwork drawings should preferably be to a scale of 1 to 100 and should give identification marks against all members; and

f) Particulars of holes required for services, pipes, machinery fixings, etc. Such holes should preferably be drilled at works.

F-4.3 Information Relating to Execution of Building Work

a) Supply of materials;

b) Weight of steelwork for payment;

c) Wastage of steel;

d) Insurance, freight and transport from shop to site;

e) Site facilities for erection;

f) Tools and plants;

g) Mode and terms of payment;

h) Schedules;

j) Force Majeure (sections and provisions for liquidation and damages for delay in completion); and

k) Escalation sections.

F-5 Detailing

In addition to the number of copies of the approved drawings or details required under the contract, dimensioned shop drawings or details should be submitted in duplicate to the engineer who should retain one copy and return the other to the steel supplier or fabricators with his comments, if any.

F-6 Time Schedule

As the dates on which subsequent trades can commence, depend on the progress of erection of the steel framing, the time schedule for the latter should be carefully drawn up and agreed to by the parties concerned at a joint meeting.

F-7 Procedure on Site

The steelwork contractor should be responsible for

the positioning and levelling of all steelwork. Any checking or approval of the setting out by the general contractor or the engineer should not relieve the steelwork contractor of his responsibilities in this respect.

F-8 Inspection

References may be made to the accepted standard [6-6(41)] for general guidance.

F-8.1 Access to Contractor's Works

The contractor should offer facilities for the inspection of the work at all stages.

F-8.2 Inspection of Fabrication

Unless otherwise, agreed, the inspection should be carried out at the place of fabrication. The contractor should be responsible for the accuracy of the work and for any error, which may be subsequently discovered.

F-8.3 Inspection on Site

To facilitate inspection, the contractor should during all working hours, have a foreman or properly accredited charge hand available on the site, together with a complete set of contract drawings and any further drawings and instructions which may have been issued from time to time.

F-9 Maintenance

F-9.1 General

Where steelwork is to be encased in solid concrete, brickwork or masonry, the question of maintenance should not arise, but where steelwork is to be housed in hollow fire protection or is to be unprotected, particularly where the steelwork is exposed to a corroding agent, the question of painting or protective treatment of the steelwork should be given careful consideration at the construction stage, having regard to the special circumstances of the case.