Installation Standards for Aerial Network - Technopediasite


Friday, December 6, 2019

Installation Standards for Aerial Network

Installation Standards for Aerial Network : Initially the aerial network was in vogue but in today's era, there is not even an aerial network to see. Aerial network very helpful in emergency when the network has to start as soon as possible. There are some countries in the world where digging is not possible, there is an aerial network.

Aerial network means the network that is above the ground. Aerial networks have a special importance in the telecom sector. Today we will discuss about Aerial Network Installation in this article.Poles play very important role in Aerial Network because cable run through the poles from one place to another. For installation of Aerial Network poles placed as not to obstruct pedestrian and vehicular traffic, and also cause the minimum disturbance.

Installation Standards for Aerial Network
Aerial Network Installation

General Standards For Aerial Network 

The conditions under which poles are to be erected as well as height of poles are given in the telecom industry Material Specifications. The size and specification of the pols, depends on the environment condition and the telecom company. It is very important that only approved poles can be used for aerial network installation. Where variations from the approved design are indicated, reference shall be made to the Supervisor, e.g., for minimum clearance, obstructions, power separations, and the like.

Poles and the associated stays shall be placed so that they are not closer to roadways than specified by local government authority and where this is not specified, the distance shall be not less than 100 cm and should preferably be approximately 200-cm. If there is a roadside ditch, the poles should normally be placed outside and away from the roadway.

If the roadway is winding or poorly defined, the pole line shall, as far as is practical, be set as a straight line along the route of the roadway.

Poles For Aerial Network

Excavations for poles shall be of sufficient diameter to permit compaction of the concrete fill around the pole and throughout the entire depth of the hole. The use of mechanical augers is preferred.

Ground bearing pressures shall be taken into account, with testing performed where required. In ground where excavation to full depth cannot be carried out because of bed rock below ground level or mounting directly on rock, the butt of the pole shall be fixed by means of two plate dowels and wedges and poles stayed with three stays at horizontal angles of 120°.

Alternative methods of mounting in rock may be presented to the Supervisor or approval, e.g., Rock Auger or blasting. The setting of different types of poles in light soil and hard soil shall be according to the following:

Setting Depths for Aerial Network Poles

Depths for Aerial Network Poles
Setting depths for Aerial Network

When erecting poles in ground with poor bearing capacity, the poles shall have adequate footings and anchors provided so that they can support loads from lines and stays.

Poles shall be set plumb except at corners where they shall be set raked against the load so that pole tops will be in line after the load is applied. The rake of the pole shall not exceed 5-cm for each meter of pole length after the cables have been installed at the required tension. Terminal poles shall be set so as to be plumbed and in line after the load has been applied.

Each pole shall be clearly and durably numbered with the correct identification number, on the side that faces the carriage-way. You must follow Construction Guidelines of Telecom industry.

Stays And Struts

Poles shall be stayed and strutted as indicated by the Telecom Industry Construction Guidelines or by the site engineer.

In situations where a "slack" end span is specified, the last but one pole may be stayed. The cable suspension strands will then be attached to the end pole with the minimum tension force being applied, so as to leave this pole without undue strain.

The stays shall normally have an inclination of 45°, i.e. the height from ground level to where the stay is applied on the pole shall equal the distance from the base of the pole to the eyelet of the stay rod. A stay spread to height ratio of 1:1 is the ideal.

Stay spreads of more than 1 : 1.25 or less than 1 : 0.8 shall not be used without the permission of the Supervisor. Stay wires shall normally be secured to a pole at the same height as the cable is being supported, unless indicated otherwise.

The hole for the stay block shall be dug to a depth of approximately 150-cm. When the excavated material is replaced, it shall be packed down tightly over the stay block and if stones are available, these shall be used to "wedge" the stay block into place in the hole.

An alternative installation may utilize mass concrete anchor. Stays to be installed in rock shall utilize drilled rock anchors.

The stay shall be made clearly visible by a colored sleeve secured around the stay, from ground level to a minimum height of 200-cm.

Electrical continuity shall normally be maintained between the stay wire and the cable suspension strand with the exceptions of electrically insulated stays at crossings with overhead power lines, and wind stays, as specified by the Engineer.

Where a strut is to be installed, the base of the strut shall have an adequate footing provided, which shall take into account the available bearing pressures.

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