UNIT OF LATTICE TRUSS AND METHOD OF ITS MANUFACTURING Russian patent published in 2010 - IPC E01D19/00 

FIELD: construction.

SUBSTANCE: invention may be used in unit of lattice truss, including belt of boxy section with welded vertical and horizontal sheets, gusset plates with sides of curvilinear contour with radius R, belts, braces and joint pads fixed to horizontal sheet. In crossed horizontal sheet in zone of arrangement of gusset plates, arranged as a whole with vertical sheets, there are through slots coaxial to vertical sheets with technological allowances at end sections, width of through slots exceeds thickness of vertical gusset plates by value of welding gap. External parts of gusset plates sides curvilinear by radius R in zone of coupling with end sections of slots have smooth transition to straight sections of vertical sheets of belt, arranged below level of crossed horizontal sheet. End sections of slot in zone of transition of external parts of gusset plates sides curvilinear by radius R to straight sections of vertical sheets of belt arranged below level of internal surface of crossed horizontal sheet, and in zone of technological allowances are filled with metal melt to level of external edge of crossed horizontal sheet. Smooth transition in gusset plates may be arranged with inclination of 1:4. Width of slot is by 2 mm more than thickness of wall of gusset plate with allowance of +2;-1 mm. Method for manufacturing of lattice truss unit consists in assembly and welding of horizontal and vertical sheets of lower belt and further welding to horizontal sheet of gusset plates. Previously vertical walls and gusset plates are arranged as a whole, in horizontal sheet crossed by gusset plates, in areas of arrangement of gusset plates there are through slots with technological allowances at end sections. After assembly and welding of horizontal sheet without slots with vertical sheets, horizontal sheet with slots is lowered, down to design elevation, inserting gusset plates through slots, and ends of smooth transition of gusset plates on straight sections of vertical sheets of belt and straight sections of these vertical sheets are arranged below level of internal surface of crossed horizontal sheet, afterwards in zone of slots arrangement gusset plates are welded to horizontal sheet, besides, end sections of slots in zone of transition of external parts of gusset plates sides curvilinear by radius R to straight sections of vertical sheets of belt, and in zone of technological allowances are filled with metal melt to level of external edge of crossed horizontal sheet by means of multiple electric welding in these zones.

EFFECT: method cost reduction and improved operation reliability.