RU2503783C1 - Method to manufacture truss with lowering diagonals - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: truss is made of straight box-shaped belts with a triangular or a diagonal web. Single-shear ends of diagonals are connected by welding with belts. First half-trusses are manufactured in accordance with the project. The upper belt is laid, which comprises a flanged mounting joint of the belt and a support unit of the half-truss. The support unit comprises two gusset plates welded to the belt to continue the plane of walls of the upper belt. A support plate of the half-truss is welded perpendicularly to the gusset plates. Then the lower belt of the truss is laid with width equal to the upper belt, which comprises a flanged mounting joint of the lower belt of the half-truss. Afterwards rods in the web of the rising direction of the half-truss are butt-welded to the belts, making them box-shaped and equal in width to belts of half-trusses. Then rods of the web of lowering direction are laid as overlapping over the units of the half-truss, making them from two parallel unequal-sided angles or strips. Strips are pre-stressed, being tightened in the middle with a bolt.

EFFECT: reduced labour intensiveness of manufacturing.

4 dwg

Description

The invention relates to the construction and relates to a method of manufacturing lattice trusses from rolling profiles, performed on welding.

A known method of manufacturing a truss with downward braces made of straight belts and a triangular lattice with a section of box-shaped profiles, which consists in joining by welding the single-cut ends of the braces with the belts in the butt (see Designer's Guide. Metal Structures, M. 1998, p. 175, 181 Fig. 7.16, 7.17).

The disadvantage of this method is the alignment in the node axis of the connected braces with belts, which requires increased consumption of metal on the truss rods.

The prototype of the invention is a method of manufacturing a triangular sub-rafter truss with descending braces, made from a direct box belt, which consists in connecting by welding the single-cut ends of two descending braces with an upper belt (see the Album of a typical series on trusses from bent-welded profiles. Series 1.460.3-23.98.1 - 27KM, sheet truss truss). This method cannot be applied as a whole for the manufacture of farms with a triangular or diagonal lattice, because the width of the trusses and belts converging at the nodes of the lattice rods is different, which requires the use of gussets in the nodes of the trusses and leads to the complexity of truss production.

The invention is aimed at reducing the complexity of the manufacture of the farm with the provision of centering the axes converging in the nodes of the braces.

The result is achieved by the fact that in the method of manufacturing a truss with descending braces made of straight box belts with a triangular or diagonal grid, consisting in welding by welding the single-cut ends of the braces with belts, according to the invention, semi-trusses are first made according to the project: the upper belt is made from the box-shaped profile, comprising a flanged mounting joint of the belt and a support node of the semi-truss, consisting of two cuts welded to the belt in the continuation of the plane of the walls of the upper belt and welded perpendicular half-farm base plate; then lay the bottom belt of the farm with a width equal to the upper belt, which contains a flange mounting joint of the lower belt of the half-farm; after which butt rods of the lattice of the upward direction of the semi-truss are welded to the butt-welded belts, making them box-shaped and equal in width to the half-truss belts; Then, the rods of the downward lattice are superimposed on the nodes of the half-farm, making them from two parallel unequal corners or strips, while the strips are pre-tensioned by pulling them together in the middle with a bolt.

Figure 1 shows a gable farm with a triangular lattice. In figure 2,3 and 4 - the sequence of manufacture of the farm.

The farm with a triangular or diagonal lattice consists of an upper belt 1 and a lower belt 2, made of box-shaped profiles of equal width "b" (Figure 1). All ascending braces of a farm with a triangular or braced grating are made of box-shaped profiles 3 with a profile width equal to the width of the belts (the thickness of the profiles is taken as calculated). The descending support brace 4 is made of two unequal corners or stripes (Figure 1). The remaining braces 5 of the downward farm are made of two strips, which are superimposed on the nodes of the farm and welded (Figure 1). The farm in the factory is collected in the following sequence. First, half-trusses are made according to the project, for which: they stack the upper belt 1 from the box-shaped profile (FIG. 2), which contains the flange mounting joint 6, and the half-farm support unit (FIG. 2), consisting of two gussets 7 welded to the belt 1 in the continuation of the plane of the walls of the upper belt 1 and welded perpendicular to the shapes 7 base plate 8 of the half-farm; then stack the lower girdle 2 of the truss with the width of the girdle 2 equal to the width of the upper girdle 1, which contains a flange mounting joint 9 of the lower girdle 2 of the half-farm; then to the butt 1 and 2 butt welded one-piece braces of the lattice of the ascending direction 3, making them box-shaped and equal in width to the belts of the semi-farms 1 and 2 (Figure 3); then, the braces 4 and 5 of the downward lattice are overlapped on the nodes of the half-farm (Figure 4), making them from two parallel unequal corners 4 or strips 5, while the strips 5 are pre-tensioned in the middle by tightening them with a bolt 10.

The pre-voltage assigned to strips 5 eliminates the flexibility in their work, which is useful for the deformability of the farm.

The method allows all the truss rods to be single-cut, ensuring that the axes of the braces converging in the assembly are centered, in addition, in the manufacture of descending braces with overlap on the semi-truss units, the walls of the box-shaped profiles of belts and braces are reinforced, which is also useful for the operation of the truss units.

The invention can be most effectively used in the design and manufacture of trusses from box and open profiles with spans of up to 36 meters or more.

Claims (1)

A method of manufacturing a farm with descending braces made of straight box-shaped belts with a triangular or diagonal lattice, which consists in connecting by welding the single-cut ends of the braces with belts, characterized in that half-trusses are first made according to the project: they lay the upper belt from the box profile containing the flange mounting joint of the belt and a support node of the half-farm, consisting of two gusses welded to the belt in the continuation of the plane of the walls of the upper girdle, and a support plate welded perpendicular to the gussets rma; then lay the bottom belt of the farm with a width equal to the upper belt, which contains a flange mounting joint of the lower belt of the half-farm; after which butt rods of the lattice of the upward direction of the semi-truss are welded to the butt-welded belts, making them box-shaped and equal in width to the half-truss belts; Then, the rods of the lattice of the downward direction are superimposed on the nodes of the half-farm, making them from two parallel unequal corners or strips, while the strips are prestressed, pulling them together in the middle with a bolt.

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