METHOD TO INCREASE DURABILITY OF STEEL TRUSS

摘要

FIELD: construction.SUBSTANCE: truss comprises ascending compressed support and intermediate braces, stands and descending stretched braces. Upper and lower belts of the truss are made of equally stable double-tee sections. In the most stressed zone in the middle of the span the upper belt is converted into a tubular one by means of welding of closing sheets at sides to the double-tee section. All compressed elements of the truss lattice are made of oval pipes with the ratio of larger dimension to smaller one equal to three. Oval pipes are aligned with a larger dimension perpendicularly to the truss plane. Compressed braces are detached by two struts in the truss plane. After installation of the truss into the design position, hoses of concrete pipelines are connected to nozzles of closed tubular elements of the truss. Fine-grained expanding concrete is injected into cavities of elements with formation of guncrete elements after concrete setting.EFFECT: improved durability and reliability of a truss.5 dwg