10 and 30 m in a cylindrical or troncoconical form with upper and lower flanges 5 6 for connection with other sections according to a first embodiment of the invention the ladder 3 is not directly secured to the section 4 of the tower but to two beams 1 1 u2032 the beams 1 1 u2032 preferably with a double t profile are secured to the upper flange 5 and to the lower flange 6 of the section 4 of the tower in a manner in parallel to the walls they are secured rigidly to the upper flange 5 with welds or bolts for example and are secured horizontally to the lower flange 6 in a manner which allows lengthways displacement this manner of securing the beams 1 1 u2032 allows bending of the section 4 caused by the operational loads which act on the tower equally allowing dilation and contraction with changes in temperature without the aforementioned beams 1 1 u2032 suffering external operational loads the only external loads on said beams 1 1 u2032 will be produced by the people using the ladder 3 fig6 shows a rigid fixture of the beams 1 1 u2032 on the upper flange 5 using bolts 21 and support chocks 23 appropriately to couple the flat flange of the double t beams 1 1 u2032 to the curved surface of the flange 5 fig7 shows a horizontal rigid fixture of the beams 1 1 u2032 to the lower flange 6 using bolts 27 and clamps 25 which allow a lengthways displacement of the beams 1 1 u2032 and are designed appropriately on the surface supported on the curved surface of the flange 6 fig8 shows a combination of horizontal fixtures of the beams 1 1 u2032 to the lower flange 6.