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High Mast

Post Date : April 19
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High Mast with R&L Gear system

The High mast with raising & lowering gear system is designed for large outdoor areas lighting such as highways, interchanges, etc. The high mast with raising and lowering gear system is a safe system due to reliable service hoist which raises and lowers the fixtures ring for maintenance purposes. Raising & lowering gear system consists of the following major parts as shown in our catalogue: 1- Head Frame.2- Luminaries Ring.3- Single or Double Drum Winch.4- Portable power tool with Portable Electrical Motor. The raising & lowering system is a special electromechanical arrangement which is procured by us from reputed suppliers. High Mast Shape: The high masts are usually made out of continuously tapered steel shafts with polygonal shape of sixteen sides, with dimensions and thicknesses complying to the structural design analysis and suitable to suit the raising & lowering mechanism. Shafts are made from steel sheets folded to required shape and welded longitudinally by automatic arc welding machine Shafts are made out of multiple segments depending on the height of the mast, each segment will have length of not more than 14m, with minimum overlap of 1.5 times of the female segment across flat. Circular or Square base plate with holes suitable for the anchor bolts is welded to the bottom of the shaft by double fillet weld according to international standard, base plate will be open in the centre to allow cables in. Base plate dimensions given in our drawings are complying with structural design analysis and the foundation requirements. Anchor bolts to fix the base plate to the concrete foundation are supplied with the required nuts and washers and having the size and dimensions as per the structural analysis. Shaft is provided with a door opening at a convenient height with dimensions and size complying with the requirements of the raising & lowering mechanism. Door opening is reinforced to maintain shaft strength; In addition, a rubber gasket is fixed around the door frame for weatherproofing. Door cover is fixed to the shaft by using steel Hinges. An Earthing lug is welded inside the shaft at the door opening level and equipped with the required bolts, nuts and washers for earthing. Straightness, tolerances and plumbness of the pole are maintained within permissible limits according to international standards. Design: High Masts are designed according to AASHTO standard  Standard Specifications for Structural Supports for Highway Signs, Luminaries and Traffic Signals  and its latest revisions. Design wind speed is 160 Km/hr or as per the customer request multiplied by gust factor of 1.3 (Gust speed is 208 Km/ hr or as specified in the project specifications) Design of high masts is performed utilizing Computer software to analyse the high mast shaft, base plate and anchor bolts. Material: Material used to fabricate the high mast components will be in accordance of international standards and as per the project specifications. Finishing: Shaft, Base plate, and other accessories are hot dip galvanised according to BS EN 1461 and its recent revisions, the minimum average coating thickness is according to BS EN 1461, or as per the customer requirements, but not more than 120 microns in any case. No welding, cutting or drilling is done after galvanising. The anchor bolts including nuts and washers are hot dip galvanised according to ASTM A 153.
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Galva Coat For Galvanizing & Lighting Poles

Shape: The street lighting Poles of heights from 4m up to 20m covering almost all of the outdoor street lighting requirements, are usually made out of tapered steel shafts with octagonal or conical shape, with dimensions complying with the design structural analysis, international standards requirements, and as per customer requirements. Only poles with heights up to 14 meters are made from one shaft segment. Poles up to 20m in height are made from two segments with minimum overlap length of 1.5 times the diameter of bottom of the upper segment. Shafts are made from steel sheet folded to the required shape and welded longitudinally by automatic arc welding machine. Base plate is square in shape with slotted holes suitable for anchor bolts. Dimensions of the base plate given in our drawings are complying with design analysis. Base plate is welded to the bottom of the shaft by double fillet weld, according to International standards. Base plate will be open in the centre to allow cables in. The brackets to carry the light fittings are in shape and dimensions complying with the customer requirements and the specifications of the light fittings. Shaft top is equipped with 8 nuts welded to the shaft and 8 No. head-less screws to grip the arm bracket to the shaft, as shown on our drawings. Anchor bolts to fix the base plate to the concrete foundation are supplied with the required nuts and washers and having the size and dimension as per the structural analysis. Door opening size and location is as per the customer requirements and its complying with the dimensions of the cut-out. Door opening is reinforced to maintain shaft strength; in addition, a rubber gasket is fixed around the door frame for weatherproofing. Door cover is fixed to pole shaft by using a stainless steel Chain or Hinges. An Earthing lug is welded inside the shaft at the door opening level and equipped with the required bolts, nuts and washers for earthing. Straightness, tolerances and plumbness of the pole are maintained within permissible limits according to international standards. Design: Poles are designed according to AASHTO standard  Standard Specifications for Structural Supports for Highway Signs, Luminaries and Traffic Signals  and its latest revisions. Design wind speed is 160 Km/hr or as per the customer request multiplied by gust factor of 1.3 (Gust speed is 208 Km/ hr or as specified in the project specifications) Design of poles is performed utilizing Computer software to analyse the pole shaft, base plate and anchor bolts. Material: Material used to fabricate the pole components will be in accordance of international standards and as per the project specifications. Finishing: Shaft, Base plate, Arm Bracket and other accessories are hot dip galvanised according to BS EN 1461 and its recent revisions, the minimum average coating thickness is according to BS EN 1461, or as per the customer requirements, but not more than 120 microns in any case. No welding, cutting or drilling is done after galvanising. The anchor bolts including nuts and washers are hot dip galvanised according to ASTM A 153.
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