NORMARC NM 7000 Series, Инструкция по установке и пусконаладке, Страница: 14 / 189

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3 Glidepath antenna system assembly/towers 10m and 15m
3.1 General
See Volume 2 Section 3 Chapter 6.
The site selected for the assembly of the GP mast framework should be of sufficient size to
accommodate either the 10 meter or the 15 meter mast.
It is also recommended to select a relatively well levelled site to avoid twists or bends in the
mast construction which may create difficulties in joining the parts.
To facilitate the work, four trestles are needed, made of timber from the transport crates or
other. See Vol. 2 Section 3 Chapter 6.
Align the trestles, one pair for the first section, parallel to each other, approximately 4 meters
apart. See marked-up drawing 16641A3/16642A3.
Before the work starts, the colours of the sections should be observed as follows:
Tightening and securing of bolts:
Recommended torque’s are: M12 - 75NM; M24 - 700NM (ungreased bolts). Preferred tighten-
ing method is “Turn of nut” method:
1. Snug tight using 0,6 x recommended torque. (0,36 x for greased bolts)
C1 (clearance length) = Distance between bolthead and nut. See fig. 3-1
10 meter mast: Top section: Orange
Bottom section: White
Ref. drawing 16641A3.
15 meter mast: Top section: Orange
Middle section: White
Bottom section: Orange
Ref. drawing 16642A3.
Turn nut - 1/3 turn if C1< 2x bolt dia.
1/2 turn if C1 is between 2 and 4x bolt dia.
2/3 turn if C1 is between 4x and 8x bolt dia.