Bridges, viaducts, overpasses

Construction of bridges, viaducts, overpasses and other extended transport structures in SkyWay string technology

SkyWay Technologies Co. offers an innovative solution for the design and construction of road, railway and pedestrian bridges, viaducts, overpasses and other extended transport structures (hereinafter — bridges). Such bridges will have features that are fully consistent with the existing national standards. For example, in the Russian Federation such a regulatory document is the Construction Norms and Regulations 2.05.03-84* "Bridges and pipes", which applies to rail, road and pedestrian bridges, bridges for metro lines and speedy trams, as well as bridges, combined with rail and road transport. In addition, string bridges correspond to national standards for the design of steel structures (in Russia it is the Construction Norms and Regulations II-23-81 "Steel structures"), all the provisions of the European Norms Project (ENV) and the new US bridge standards (AASHTO).

It is proposed to construct string bridges in the form of a pre-stressed continuous structure of steel-reinforced concrete, clamped at the ends to anchor supports, which contains road coverage, or coverage for pedestrian bridges. Solid pre-stressed string structure, clamped at the ends, by its bearing capacity and strength will replace traditional steel, reinforced concrete or steel-reinforced concrete bridge span superstructures. It is confirmed by strength calculations, made by traditional methods in accordance with the applicable national and international standards. It is reasonable to do these calculations and studies on particular bridges jointly with specialists of the existing bridge design offices, having the experience in the design, construction and operation of suspended and cable-stayed bridges, which are structurally closest to string bridges.

Visually string bridges are similar to traditional ones because the know-how are hidden inside the structure, apart from their glaring lightness and delicateness of the structure. Thus, the proposed technology excludes the need for expansion joints throughout the whole structure, regardless of its length. It increases the smoothness, strength and durability of traditional coverage on bridges, reduces by times consumption of conventional structural materials and, consequently, reduces the cost of structures. This significantly decreases the load on intermediate supports, that are often placed in water, and accordingly, reduces the requirements for bearing capacity of soil. This also simplifies the design of other elements of the bridge structure. With significant improvement of operational features, such bridge would be much cheaper than traditional bridges. It is easily confirmed and justified by calculations made by traditional methods in accordance with the applicable national and international regulations.

Provided the load-bearing structures of traditional bridges are produced in string technologies (in the form of pre-stressed load-bearing beams or string trusses), their cost is reduced by 2–3 times or more alongside with increasing their durability and improving performance features. In particular, the coverage of motor-road bridges will be arranged without expansion joints, as the string bearing structure of the bridge will be produced continuous (uncut) throughout its entire length, without any transverse gaps and joints. For their erection, string bridges do not require non-traditional materials and technologies and can be built by existing bridge teams with existing construction equipment and construction machines. 

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