An offshore mast is erected to support a load. At least one stay cable supports the offshore mast. The stay cable has an end and an opposite end. The end of the stay cable attaches to an upper region of the offshore mast. The opposite end of the stay cable is anchored, perhaps to an ocean bed of the earth. The stay cable is oriented at an angle not exceeding ten degrees.

An offshore mast is erected to support a load. At least one stay cable supports the offshore mast. The stay cable has an end and an opposite end. The end of the stay cable attaches to an upper region of the offshore mast. The opposite end of the stay cable is anchored, perhaps to an ocean bed of the earth. The stay cable is oriented at an angle not exceeding ten degrees.

A method for installing trays in a case where a plate tower is horizontally placed or approximately horizontally placed. No manhole is formed on a cylinder body of the plate tower, so as to reduce damage to the cylinder body of the plate tower, thereby improving the airtight performance of the plate tower. Since the trays are installed in a case where the plate tower is horizontally placed or approximately horizontally placed, manual operations are facilitated, manual working is reduced, and the potential safety hazard caused by high-place operations is avoided.

The present disclosure describes a module for a telecommunications pole. The module may include a main base plate configured such that telecommunications equipment can be mounted thereto, a top frame member and a bottom frame member coupled to opposing ends of the main base plate and extending outwardly from, and generally perpendicularly to, the main base plate; and a plurality of side frame members coupled to the top and bottom frame members, each side frame member extending collinearly with the main base plate. The top, bottom and side frame members each include a plurality of recesses and protrusions configured and/or positioned such that the top, bottom, and side frame members may be aligned and assembled within the telecommunications pole. Module assemblies and methods of assembling the modules are also described herein.

The invention provides a mast comprising a modular, hollow tubular body having cylindrical, outer wall segments with an outer surface and enclosing an axially extending cavity, said tubular body comprising in its cavity a first mast segment arranged in between a base segment and a second mast segment and releasably connected thereto. Each of the base, first and second mast segment has an internal structure for bearing the weight of the mast, the internal structure of the first mast segment comprises in the cavity an axially extending inner cylinder connected via radially extending ribs to outer cylinder portions at a first respectively a second end of the inner cylinder and said ribs axially extending from said first end to said second end. Said inner structure being surrounded by a removably mounted, outer wall segment. The inner cylinder by a core wall of the inner cylinder encloses an axially extending core cavity for enabling cabling to pass through from the cavity in the base segment to the cavity in the second mast segment. In mounted position the first part is connected with the first end of its core wall directly to the base part and with a second end of its core wall to the second mast segment.

The invention provides a mast comprising a modular, hollow tubular body having cylindrical, outer wall segments with an outer surface and enclosing an axially extending cavity, said tubular body comprising in its cavity a first mast segment arranged in between a base segment and a second mast segment and releasably connected thereto. Each of the base, first and second mast segment has an internal structure for bearing the weight of the mast, the internal structure of the first mast segment comprises in the cavity an axially extending inner cylinder connected via radially extending ribs to outer cylinder portions at a first respectively a second end of the inner cylinder and said ribs axially extending from said first end to said second end. Said inner structure being surrounded by a removably mounted, outer wall segment. The inner cylinder by a core wall of the inner cylinder encloses an axially extending core cavity for enabling cabling to pass through from the cavity in the base segment to the cavity in the second mast segment. In mounted position the first part is connected with the first end of its core wall directly to the base part and with a second end of its core wall to the second mast segment.

An apparatus and method for the containment of vertical structures using a flexible, collapsible, and movable shroud. The shroud containment system protects the surrounding environment by catching liquid and solid debris and contaminants from the inside and protects the enshrouded structure and workers from wind, debris, contaminants, and precipitation on the outside as well as providing enhanced protection against falling persons and equipment. The shroud also conceals the vertical structure in whole or in part and greatly eases the setup, takedown, and relocation of the shroud along the axis of the vertical structure due to its modular, impermanent design and method of erection, collapse, and translation.

An apparatus and method for the containment of vertical structures using a flexible, collapsible, and movable shroud. The shroud containment system protects the surrounding environment by catching liquid and solid debris and contaminants from the inside and protects the enshrouded structure and workers from wind, debris, contaminants, and precipitation on the outside as well as providing enhanced protection against falling persons and equipment. The shroud also conceals the vertical structure in whole or in part and greatly eases the setup, takedown, and relocation of the shroud along the axis of the vertical structure due to its modular, impermanent design and method of erection, collapse, and translation.

An enclosure having an outer surface with a vortex-induced vibration suppression function is provided. The outer surface of the enclosure is provided with a plurality of annular recesses surrounding the enclosure, such that alternately concave and convex annular recesses and annular bosses configured for disrupting a boundary layer of a laminar flow are formed on the outer surface of the enclosure. An outer surface of the annular boss is provided with a plurality of air guiding grooves, and the plurality of air guiding grooves are distributed in a circumferential direction of the annular boss. The air guiding grooves are inclined upward or downward, such that part of an upwind incoming flow flowing to the annular boss can be guided into the annular recesses adjacent to the annular boss via the air guiding grooves. With the convex-concave outer surface, the cause of formation of the vortex-induced vibration can be prevented.

An enclosure having an outer surface with a vortex-induced vibration suppression function is provided. The outer surface of the enclosure is provided with a plurality of annular recesses surrounding the enclosure, such that alternately concave and convex annular recesses and annular bosses configured for disrupting a boundary layer of a laminar flow are formed on the outer surface of the enclosure. An outer surface of the annular boss is provided with a plurality of air guiding grooves, and the plurality of air guiding grooves are distributed in a circumferential direction of the annular boss. The air guiding grooves are inclined upward or downward, such that part of an upwind incoming flow flowing to the annular boss can be guided into the annular recesses adjacent to the annular boss via the air guiding grooves. With the convex-concave outer surface, the cause of formation of the vortex-induced vibration can be prevented.