General Specification Of Scaffolding 3z69k

GENERAL SPECIFICATION OF SCAFFOLDING: No scaffold shall be erected, moved, dismantled, or altered except under the supervision of competent persons (that is qualified and authorised certifying engineer) and by competent workmen possessing adequate experience of such work under valid permit. All materials for any scaffold shall be inspected by competent person on each occasion before using. Only cup-lock type scaffolding material shall be used. In case it is not feasible to use cup-lock type scaffolding material, clearance shall be obtained from Engineer in charge to use other type of steel scaffolding materials. Use of Bamboo scaffolding, wooden planks & manila/ coir rope is strictly prohibited in LITL. For any overhead job at height of 2.0 meters and above, scaffolding with railing and toe board is to be erected at working platforms. For any overhead job at height 2.0 meters and above, it will be mandatory to use Double hook type Safety belt with fall arrester and Safety nets in construction and maintenance activities. However, during erecting scaffolding only safety belt as above shall be used. Scaffolds and their components must be capable of ing without failure at least 4 times the maximum intended load. Steel scaffolding should be erected and used in accordance with manufacturer's Recommendations, proper seating and locking of all connections, using the corrective devices. During setting up and dismantling of scaffolds, warning signs, safety cordons and other safety measures shall be provided to ensure safety. The footing or anchorage for scaffolds shall be sound, rigid, and capable of carrying the maximum intended load without settling or displacement. Unstable objects such as barrels, boxes, loose bricks or concrete blocks, shall not be used to scaffolds or planks. Base plates with shank of size minimum 5 cm long for scaffolding shall be provided. The base plate shall be of Mild Steel of minimum 5 mm thickness and of at least 15 cm X 15 cm size. Overhead protection must be provided for men on a scaffold exposed to overhead hazards. Slippery conditions on scaffolds shall be eliminated immediately after they occur.

Drawings and specifications of all tube and coupler scaffolds must be designed by a Q ualified engineer competent in this field considering the criticality of structure. Scaffolding above 40 Mtrs height, if to be erected, must be designed by professional. Heavy duty tube and coupler scaffold shall have all posts, runners, and bracing of only steel material as per IS 1161-1963 (Specifications for steel tubes for structural purposes) and shall also satisfy IS 2750- 1963 (Specifications for steel scaffolding). No dissimilar /non-standard pipes or sections shall be used in scaffold work. In general steel tubes to be used, shall be minimum of size 40 mm NB heavy class of minimum 4.00-mm thickness or 4.37 Kg Per Running Meter weight. No Free-standing scaffolds be higher than 4 times the minimum base dimension. Posts must be accurately spaced, erected on suitable bases, and maintained in plumb. The posts shall not be spaced more than 2.0 Mtrs. The poles, legs, or uprights of scaffolds must be plumb, and securely and rigidly braced to prevent swaying and displacement. PLUMB-NESS: It is absolutely essential that the scaffold is erected plumb, to ensure maximum structural capability of the system. When the first tier of scaffold is erected, check for plumb-ness and continue doing so as the scaffold is built. Settlement or slight variations in the fit of the components may require additional adjustments as tiers are added to the scaffold tower. The scaffold frame should be checked for plumbness after each tier is added to the scaffold. In addition to the scaffold being in plumb, each working deck must be at level. Runners / Ledgers shall be erected along the length of the scaffold, located on both inside and the outside posts at even heights. Runners / Ledgers shall be interlocked to the inside and the outside posts at even heights. Runners / Ledgers shall be interlocked to form continuous lengths and coupled to each post. The bottom Runners / Ledgers must be located as close to the base as possible (300 mm). Runners / Ledgers shall not be spaced more than 2.0 Mtrs on centers. Cross bracing must be installed across the width of the scaffold at least every third set of posts horizontally and every fourth runner vertically. Such bracing must extend diagonally from the inner and outer runners upward to the next outer and inner runners.

The entire scaffold shall be tied to and securely braced against the building/structure at intervals not to exceed 10 Mtrs horizontally and 8.50 Mtrs vertically Scaffold provided at a area having pedestrian traffic, minimum 2.5 Mtrs head clearance must be provided. All tools / loose materials used at scaffold platforms must be kept in boxes. WORKING PLATFORMS (INCLUDING WORKING STAGES): Every working platform more than 2.0 m high from which a person is likely to fall shall be of steel plates/planks/jalis and shall be: a) Closely boarded, planked, or plated; b) At least 700 mm wide if the platform is used as a footing only and not for the deposit /keeping of any material; c) At least 900 mm wide if the platform is used for the deposit of material; d) At least 1100mm wide if the platform is used for the of any higher platform; e) At least 1300mm wide if the platform is one upon which stone is dressed or roughly shaped; and f) At least 1500mm wide if the platform is used for the of any higher platform and is one upon which stone is dressed or roughly shaped. g) Two metal plates/planks shall not have more than 25 mm gap between them. The distance between two consecutive transoms or other s on which a platform rests shall be fixed with due regard to the anticipated load and the nature of platform flooring. As a general rule such transoms shall not be placed more than 1.0 Mtr apart. GUARD-RAILS AND TOE-BOARD AT WORKING PLACES:

Every side of a working platform or working place, being a side thereof from which a person is likely to fall, a height of more than 2 m shall be provided one or more suitable guard-rail of adequate strength, to a height of at least 900 mm (but maximum 1200mm) above the platform or place and above any raised standing place on the platform, and with toe-boards of minimum 150mm height and so placed as to prevent so far as possible the fall of persons, materials and tools from such platform or place. Guard rails / toe boards need not be provided where platform is to be used for temporary works and where other arrangements are in place. COUPLING DEVICES: Every scaffold manufacturer provides coupling devices to scaffold frames together in the vertical plane. These devices are sometimes omitted, with the belief that the bearing weight of the scaffold and its load will keep the frame above firmly resting on the frame below. This will probably hold true until the scaffold moves or sways. Then the t may pull apart causing a scaffold collapse. Therefore, coupling devices must always be used and installed properly on every leg of the scaffold at every t as assembly proceeds. Access/Escape ladders must be provided on at least two sides of the scaffolds. Ladder shall be of rigid construction having sufficient strength for the intended loads and made of metal and all ladders shall be maintained well for safe working condition. The ladder shall be given an inclination not steeper than 1 in 4 (1 horizontal and 4 vertical). Ladders shall not be used for climbing carrying materials in hands. Ladders shall not be spliced. Where splicing is unavoidable, it shall be done only under the supervision of competent person. No ladder shall be over 9.0 Mtr. in length. Landing platform shall be provided suitably. The width between the side rails in rung ladder shall not be less than 30 Cm. for 3.0 Mtr. Length ladder. Uniform step spacing of not more than 30 Cm. shall be kept. OBJECTIVES OF INSPECTION: Inspection of scaffold should be carried out to ascertain that: (a) The scaffold is of suitable type;

(b) Material used in its construction are sound and of sufficient strength; (c) The scaffold is of sound construction and stable; (d) That the required safeguards are in position. Scaffolds should be inspected and certified: a) Before being taken into use and display board 'safe to use' shall be put. Scaffold fit for use shall be provided with GREEN tags whereas scaffolds under erection/ not fit for use shall be provided with RED tags b) After any alteration, Interruption in use Ascertain health of the persons working on scaffolding job. In case scaffold is not certified by competent person, Red tag shall be displayed. The enclosed Performa of Checklist & Scaffold for keeping inspection record as per checklist or guidelines followed in scaffold jobs are annexed.