M550XL TOWER
1. Location
Specific calculations will be necessary for each location and tower height, ba-
sed on Basic Wind Speed or Reference Wind, the Exposure Category and Topo-
graphic Category; and if applicable, the thickness of Atmospheric Ice.
These calculations will confirm the suitability of the tower configuration.
2. Standars
The standards which have served as a basis for these calculations are the fo-
llowing:
- Standard NBE- EA-95 (Steel structures).
- Standard EHE-08 (Concrete).
- Standard TIA/EIA(1)-222-G.
- Standard NBE-MV-101.
- Eurocode 0: Basis of structural design.
- Eurocode 1: Actions on structures.
UNE-EN 1991 Part 1.4: General actions. Wind actions.
NF EN 1991-1-4/NA
UNE-EN 1991-1-1 Part 1.1: General rules and rules for buildings.
- Eurocode 3: Design of steel structures.
UNE-EN 1993-1-1 Part 1.1: General rules and rules for buildings.
UNE-EN 1993-1-11 Part 1.11: Design of structures with tension components.
UNE-EN 1993-3-1 Part 3.1: Towers, masts and chimneys-Towers and masts.
NF EN 1993-3-1/NA
- ISO 12494: Atmospheric icing of structures.
- EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles.
- EN1090-2 Execution of steel structures and aluminium structures
- CE
3. Adopted solution
Standard S355/S235 steel structural hollow sections, S275JR Standard steel re-
inforcement rods and an F626 (S235) steel sheet have been considered.
We have opted for a uniform structural design of all the tower sections, to make
manufacturing and on site assembling easy.
4. Structural definition of the tower
The tower has a triangular base and is made up of standard elements, each
measuring 3.0 m.
Each element is made up of:
- 3 vertical mounting tubes.
- Horizontal bracing bars and diagonal ones.
The horizontal section of the tower is a 55cm side equilateral triangle with shaft
studs.
The horizontal bracing slabs are at 40cm.
The bottom section support of the tower is a joint design.
The tower is braced with guy wires at 120°.
5. Finishes
Hot dip galvanising (EN ISO 1461). Coating 85 μm thickness.
Lacquered with 60-80μm electrostatic polyester powder, red or white.
(1)
TIA = Telecommunications Industry Association
EIA = Electronic Industrials Association
6. Assembling the tower
Assembling the tower by sections.
This consists of fixing the bottom section onto the base and vertically aligning it.
Subsequently the other middle sections are assembled, which will be fitted with
the relevant guy wires; assembling is done by climbing up the fixed sections and
hoisting up the section to be fixed with the aid of relevant lifting tools.
Climbing must be done with the appropriate security measures (safety harness,
anchor strap, etc...) and not more than three consecutive sections should be left
without bracing. When there are three sections without guywires, auxiliary guy-
wires must be used to brace the sections throughout the assembling process.
The guy-wire tower will become aligned by adjusting the tension of the wires
and by using practical alignment devices.
7.- Reference description
Reference
Description
Oscillating M550XL Tower Base.
1) ST 235 Steel 20/25 mm sheet
Re min. 235 N/mm
Materials
Rn min. 410 N/mm
2) F-212 Steel
Hot dip galvanising (EN ISO 1461)
Finished
Coating 85 μm thickness
Lacquered with 60-80μm electrostatic polyester powder
Weight
72Kg
Reference
Description
Reinforced bottom section M550XL In Red (RAL 3020)
(1) S355 Steel Ø 50 x 6 mm.
Re min. 355 N/mm
(2) S275 Steel Ø 14 mm
Materials
Re min. 275 N/mm
(3) 275JR steel
Re min. 275 N/mm
Hot dip galvanising (EN ISO 1461)
Coating 85 μm thickness
Finished
Lacquered with 60-80μm electrostatic polyester powder
Weight
105Kg
Wind exposed
0,592m
x 1,2 coef. =0,714 m2
2
surface
3
314201
2
2
317
313921
- Rn. 510 N/mm
2
2
- Rn. 410N/mm
2
2
- Rn. 410 N/mm
2
2
3155
1
16