Stadium Masts &High Masts

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Description

The stadium high masts with fixed head frame for mounting the flood lights are mostly used for those outdoor places where the high concentration of lights is required over a small area, such as a Football Stadium, Race Course, etc.

The height of the mast and the number of the flood lights are specified by the customer or the flood lights supplier based on the lighting study for the concerned area.

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.

shape

The high masts are usually made out of continuously tapered steel shafts with polygonal shape of sixteen sides, with dimensions and thicknesses complying with the structural design analysis and the functions requirement.

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 the across flat of the female segment.

The Shaft will be equipped at the top with a fixed head frame to accept the flood lights, the head frame will be tilted with an angle up to 15 degree for flood lights aiming. The size of the head frame is based on the size and the number of the flood lights.

The high mast will be equipped at the top of the shaft with a fixed platform and service ladders for maintenance purposes. A caged ladder with resting platforms or power lift will be used to reach the platform.

Circular base plate with holes suitable for the anchor bolts 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.

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 required electrical equipments. Door opening is reinforced to maintain the 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. The door cover will be held in position with M8 Allen head locking screw.

An Earthing lug will be provided inside the shaft at the door opening level and equipped with the required bolt, nuts and washers for earthing purposes.

Straightness, tolerances and plumbness of the pole are maintained within permissible limits according to international standards.

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