METHOD OF STATEMENT FOR LIGHT WEIGHT STEEL TRUSS

WORK METHODOLOGY

1.0  Delivery, Storage And Handling

1.1       Exercise care to avoid damage during unloading and storing.

1.2       If trusses will be stored on the site for an extended period of the time before use, adequate provision should be made to protect trusses against the effects of the weather. Protect trusses and accessories from corrosion, deformation and damage while stored at site.

1.3       When lifting trusses, care must be taken to avoid any damage of truss members and joints.

1.4       In general, lifting trusses is depending on its length and shape. Sling truss from the top chord and sling should locate at equal distance from the truss centreline.

2.0  Fabrication

2.1    Site measurement should be done prior to fabrication.

2.2    All trusses will produce by using same material.

2.3    All the joints are connected with self-drilling screws. Truss members are fastened by electrical drill without any pre punched holes in order to ensure good quality of finish trusses.

2.4    The screws are self-drilling, self-locking and coated to resists rust and corrosion.

2.5       Connection shall comply with BS 5950 : Part 5 : 1987.

1.     Sizes of the screws, diameter, d : should be 3mm<d<8mm.

2.     In load carrying connections, at least 3 Nos. of fasteners should be used.

3.     The distance between centers of fasteners should be not less than 3d.

4.     The distance from the center of the fasteners to the edge should be not less than 3d. If the connection is subjected to force in one direction only which is such as to cause shear of the fasteners, the minimum edge distance may be reduced to 1.5d or 10mm, whichever is smaller, in a direction normal to the force.

3.0     Installation

3.1       Erection of trusses, including proper handling, safety precaution, temporary, bracing and other safeguards or procedures are the responsibility of the contractor or contractor’s installer.

3.2       Unless noted otherwise, trusses shall be supported on external load bearing wall or beam.

3.3       Truss design assumes the supporting structure can resists the horizontal and vertical load.

3.4       Exercise cares and provides erection bracing required to prevent toppling or domino’s effect of trusses during erection.

3.5       Erect trusses with plane of truss webs vertical and parallel to each other’s, locate at design spacing as indicated in the construction design documents.

3.6       Trusses shall be anchored by L shape steel plate at the specify location. L shape steel plate should be attached to the reinforced concrete beam by expansion bolt.

3.7       Purlin/batten should attach to the trusses according to the spacing provided.

3.8       Trusses should be placed in accordance with the truss layout plan. No amendment is allowed without the notification of the Design Engineer.

3.9       Building Material like bricks, concrete tiles etc should not under any circumstances be stacked on the trusses.

3.10    Installer should strictly follow the instruction, roof truss layout plan and shop drawings given by Design Engineer.

3.11    Provide proper lifting equipment suited to sizes and types of trusses required, applied at lift point recommended by truss fabricator. Exercise care to avoid damage to truss members during erection and keep horizontal bending of the truss to minimum.

3.12    Erection Tolerances : Space individual trusses no more than plus or minus 4 inch or 100mm from plan location.

3.13    Bracing is to apply sufficient to the plane of the truss to hold every truss member in the position.

3.14    Temporary bracing is used during erection to hold the trusses until permanent bracing, sheathing and ceiling are in place.

3.15    Permanent bracing shall comply with AS 4440-1997 section 4-bracing.

3.16    Erections of trusses, including proper handling, safety precaution, temporary bracing and other safeguards or procedures are the responsibility of the contractor or contractor’s installer.

Teraju A&S Bina Sdn. Bhd.
No. 5-5A, Jalan Kirana 1,
Taman Kirana,
86100 Ayer Hitam,
Johor Darul Takzim.
Tel : 018-580 1703 / 07-758 2922 / 07-758 2722
Fax : 07-758 2216
Email : terajuansbina7878@gmail.com
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