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The roof towers are the constructions which consist of the trusses designed specifically for the needs of transferring the vertical forces from the roofing, sleeve blocks moving across the tower length, tower head sections and steel tower bases. Alike truss systems, the towers are divided depending on their dimensions: 250, 290 and 390. All towers are made of quadrosystem trusses
Tower head section allows fastening manual hoists or lead of bearing chain of electric hoists. The tower head sections are divided depending on the dimensions of trusses and profiles used to the construction. For the needs of small roofings and constructions, the tower head section has normally the equipment to the manual hoist; for the needs of big roofings – wheels leading to the chain of electric hoists.
For the purpose of lifting of the Alspaw stage roofs, we have two types of hoists: manual and electric.
- Manual hoists – recommended mainly to the small roofings – up to the size of 12.5m x 12.5 m of every type of construction. Each of the hoists has durable steel construction, brake made of high-quality materials, low construction and low bare weight. Zink-coated bearing lifting chains and hand chains. Depending on the maximum load of the roof, we can apply hoists from 0.5T to 2T. Lifting chains and hand chains are adjusted to the height of the roof towers.
- Electric hoists – the perfect solution which facilitates lifting the roof. It can be applied for any type and size of the roofing. Universal motor attachment helps to connect the hoist with the sleeve block. Similarly to the manual hoist, we can apply several types of hoists from 0.5T to 2T. They vary not only according to load capacity, but also according to the lifting speeds.
Made of aluminum sheets, tower sleeve blocks allowing smooth hoisting of the construction for the requested height with the use of hoists. Sleeve blocks have the possibility to assembly both trisystem trusses and quadrosystem trusses. There is the separate type of the sleeve block for each size of the trusses. Sleeve blocks normally posses the clamps to the manual hoists, though they can be additionally equipped with special handle for the electric hoists.
High-quality steel profiles and special construction allows transferring large weights of the construction. Tower base consists of main body with adjustable feet and outriggers with stabilizers and adjustable feet. Every basis has the possibility to use all sizes of quadrosystem trusses. Additionally there is a possibility to mount the ballast attachments.