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Patents and Developments

Trest Zapsibgidrostroy holds 22 patents of various modifications and know-hows. We have thought out our interlocks to the smallest details; they are convenient and reliable in operation. The domestic hot rolled connector is patented and launched its production, thereby ensuring the production capacity for a complete import substitution. Twenty-three years of our hard work on improving the designs and technologies have resulted, in fact, in creation of a new direction in the construction of thin retaining walls.

The regulatory standards and technical publications estimate steel structures, including sheet piles, by metal use efficiency K = Wh / M (cm3 / kg), where Wh - the resistance moment of the profile, cm3; M – a unit weight, kg. The higher the "K", the more efficient the profile is, and the more rational work of the steel is.

The welded pipe sheet piles of Trest Zapsibgidrostroy have the highest coefficient -  K = 16.141 cm3 / kg which is 1,2¸2,4 times higher than the one for similar sheet piles of foreign production. The larger the pipe diameter, the higher the metal use efficiency in welded pipe sheet piles. For example, coefficient K = 16.6 cm3 / kg for the welded pipe sheet piles on the base of pipe Æ 720.0 mm, with walls d = 10.0mm; as for the welded pipe sheet piles on the base of Æ 1420h14,0 mm, the coefficient K = 38.9 cm3 / kg i.e. the increase in 2.3 times (38.9 cm3 / kg / 16.6 cm3 / kg = 2.3).

The profiles of the welded pipe sheet piles manufactured by Trest Zapsibgidrostroy make it possible to design and build the retaining walls of traffic junctions without anchoring systems, even if a wall height is up to 12 m. An average width of the profile (B average = 1,132 mm) of welded pipe sheet piles is 2.1 times greater than that of the sheet piles of Larsen type (B average = 538 mm). On average, the number of the interlocks of the retaining walls made of welded pipe sheet piles has reduced twice, as well as the cost of waterproofing and drainage of seepage water.