Truss from orthorhombic pipes (roll-welded profiles)
SUBSTANCE: invention relates to the construction, namely to the long construction metal lattice structures from pipes, and can be used in the manufacture of trusses, girders, columns, arches, frames and other supporting structures. The technical result is achieved by the fact that truss rods in the truss made of tubular elements, consisting of belt and lattice rigidly attached to them, made with flattened ends of the V- or W-shaped (zigzag shaped) bent elements, are made of orthorhombic shape with the ratio of diagonals 1/2, where all the large diagonal of all compressed rods is located in the plane of structure, the small diagonal - out of plane, and small diagonal of all the stretched rods is in the plane of structure, and the large - out of plane, besides the upper and lower belts are flattened in places of unshaped joints of lattice.
EFFECT: increase of the load-bearing capacity of the structure with reduction of its materials consumption.
1 tbl, 6 dwg
The proposed technical solution relates to the construction, namely to the elongated construction of the metallic lattice structures of pipes, and can be used in the fabrication of trusses, girders, columns, arches, frames, and other supporting structures. Tubular construction designs feature a high technical-economic characteristics as a structural material (metal) in the cross section of the elements is located in a very effective manner. However, a further increase of technical and economic characteristics at the expense of more rational use of particularly thin-walled pipes (closed gotowanych profiles) is constrained by the complexity of the technical solutions of joints for truss elements in lattice structures.
The greatest distribution in tubular farms received nodal non-faceted connection with the direct connection of the rods of the lattice to the zones [1. The metal structure. 3 T. T. 1. Elements of design: Proc. for high schools / Under the editorship of V. V. Gorev. - M.: Higher school, 2001. - S. 459, 462, Fig. 7.26, a, 7.28, and; 2. Metal structures: Proc. for high schools / Under the editorship of Y. I. Kudelina. - M.: Academy, 2007. - S. 292, 295, Fig. 9.24, 9.27]. Here, in order to avoid pushing (pulling out) the pipe diameter of the grille shall not be less than 0.3 of the pipe diameter of the belt. In farms of rectangular (square) GWS� this restriction is tightened twice, that is, the width of the rod of the lattice should be taken not less than 0.6 of the transverse dimension of the belt.
The disadvantage of nodes is the marked restriction, which leads to increased consumption of material rods and increase metal construction.
Another known technical solution is a lattice design with nodal non-faceted connection of the tubular elements of the farm (options), in which the diagonal of the cross section of a rectangular (or square) zone is located in the axial plane of the farm, and braces in the junction have through the notch (V-shaped), repeats the geometry of this junction. Through this cut the connection of each of the grid elements with belt carried by its two adjacent walls [1. Sokolov A. A., Logachev K. I., Sinkova V. A. Numerical studies of the stress-strain state nodal non-faceted connections of tubular truss elements. - Industrial and civil engineering, 2007, No. 8. - Pp. 40-41; 2. Zinkova V. A., Sokolov A. A. Nodal non-faceted connection of the tubular elements of the farm. Patent No. 2329361, 20.07.2008, bull. No. 20]. Similarly, in the axial plane of the farm of square pipes are located diagonally cross sections of all core elements (and the upper belt and lower belt, and lattice bracing between them) 1. Kuznetsov A. F., Kuznetsov V. A. Farm of square pipes. Patent No. 116877, 10.06.2012, bull. No. 16; 2. J. A. Packer, J. Wardenier, X.-L. Zhao, G. J. van der Vegte and Y. Kurobane. Construction with hollow steel sections. Design Guide for rectangular hollow section (RHS) joints under predominantly static loading. CIDECT, 2009. - P. 100-101].
A disadvantage of the known technical solution is the complexity of its application in farms besprovodnyh coatings, as a rib belt can crush the leaves of profiled flooring. In driving the coating itself a rib belt can be quashed by the run, so you need a device supporting tables under purlins, which negatively affects the consumption of materials of constructions, and also increases the complexity of their fabrication and installation. This disadvantage can be eliminated by ring elements pentagonal cross-section with a horizontal (shelf), two vertical and two inclined walls [Marutyan S. A., Kobalia T. L., Pavlenko, Y. I., S. A. Glukhov Nodal non-faceted connection of the tubular elements of the farm. Patent No. 116526, 27.05.2012, bull. No. 15].
A common shortcoming of the above technical solutions is the increased stiffness of the non-faceted nodal connections of tubular trusses [Pokrovsky A. A. On account of the stiffness of the nodes in the calculations of farms with small elements of flexibility. - Structural mechanics and calculation of structures, 2011, No. 3. - P. 31-32]. To not take into account the additional bending moments from the rigidity, �Stroitelnye rules and regulations recommended to perform the calculation of tubular trusses articulated by the scheme, provided when the ratio of the height of the cross section to the length of the truss elements does not exceed 1/15 1/10...[SNiP And-is at 23.81*. - M.: JSC "VSC", 2008. - Pp. 43-44]. It is obvious that the diagonal pivot of the square tubular sections, transforming them in a rhombic configuration, accompanied by increased stiffness of the non-faceted nodes, and this happens for two reasons. The first reason is the increase in the height of the cross section of the beam elements. The second reason is the direct coupling of the walls and edges between them are the core elements of the lattice with the same walls and edges between belt elements. In addition, through cuts V-shaped at the junction of the braces to belts, repeats the geometry of these junctions, require to observe the improved accuracy of manufacture and Assembly, which increases the complexity of the designs.
The closest technical solution to the proposed farm from rhombic tubes (gotowanych profiles) is a construction thin-walled metal lattice construction comprising tubular belt section and is rigidly attached to the bars. In one embodiment, this grille is made of tubular elements with tapered in the plane of the structure ends and the other bar elements of the V - or W-shaped (zigzag) shape [Orlik, V. M. Construction metal tonkas�enny lattice design. Application No. 4776531, 03.01.1990. - Copyright certificate №1760041, 07.09.1992. - Bul. No. 33].
This technical solution inherent disadvantages of the known tubular trusses with non-faceted adjacency lattice to belts, increasing the stiffness of joints, as the core with a tapered in-plane design ends even more tightening the nodes in this plane, which is accompanied by the growth of metal. The grille is made of steel curved elements V - or W-shaped (zigzag) shape, has slight bearing capacity, which limits the load on the structure.
The technical result of the proposed solutions is to increase the bearing capacity of the structure by reducing its consumption of materials.
Said technical result is achieved in that in the farm of tubular elements, comprising a belt and rigidly attached to the bars, made with the flattened ends of the curved elements of the V - or W-shaped (zigzag) shape, the rods farm made rhombic shape with respect to the diagonals 1/2, where the compressed rods larger diagonal is located in the plane of the structure, the smaller diagonal of the plane, and all tie bars the lower diagonal is located in the plane of the structure, and large - from the plane, the upper � lower belt in the field of non-faceted adjacency lattice tapered.
The proposed farm upper and lower belts, as well as triangular or diagonal bars between them made of rhombic closed gotowanych profiles. For immediate contiguity to the zones with the formation of non-faceted rhombic nodes profile specified in the project areas tapers and double bends give it a V - or W-shaped (zigzag) shape. The length of the strip (tape) billet rhombic profile, you can choose based on the entire length of a structure and its postal stamps. Flattening and double bends rhombic profile provide non-faceted layout of joints without structural eccentricities characteristic of tubular trusses from a rectangular (or square) gotowanych profiles, which eliminates the occurrence of bending moments and positively affects the consumption of structural material. Flattening protects the wall of the ring elements from the thrust and reduces its thickness. Along the lines of the bends rhombic profile in the plane of the structure formed of sheet joints, which correspond to the hinge-rod design scheme (s) and eliminate the need to take into account the stiffness of the nodes, which also contributes to the decrease of metal. From the plane of the same design bends tapered sections of rhombic profile have� greatest stiffness, approximating the stiffness of the mounting frame, which in the supporting structures can be shortened and braced elements, as is done in the constructions of coverings of the type "Tagil" [Metal structures. In 3 V. V. 2. Steel structures of buildings and structures (Handbook of the designer) / Under the editorship of V. V. Kuznetsov (Tsniiproekstalkonstruktsiya them. N. P. Melnikov). - M.: Publishing house of the DIA, 1998. - Pp. 235-236]. When the hinge pins in the plane of the structure and rigid (frame) from the plane of the calculated length of the truss elements of the lattice in the plane design is two times more than the estimated length of the plane [Metal structures. 3 T. T. 1. Elements of structures: a Textbook for high schools / Under the editorship of V. V. Gorev. - M.: Higher school, 2004. - P. 332, Fig. 6.11]. On this basis, the core elements of the lattice in-plane and out-plane design had the same flexibility, suitable such cross-sectional profile, in which the radii of inertia along the principal Central axes differ in two times. This condition corresponds to a thin-walled tubular cross section rhombic shape with respect to the diagonals 1/2, where the larger screen is located in the plane of the structure, and lower out-of-plane. Moreover, the value of the radius of gyration for the most diagonal exceeds the sum of the radius of gyration similar rhombic profile with equal �diagonaly, that is, a square that in a certain way contributes to the further reduction of the material of load-bearing structures. Here you can discover reserves upper bearing capacity (compressed) farm belt, and if it be done from such rhombic profile with a corresponding flattening in the non-faceted nodes. In addition, rhombic profiles in the proposed farm attitude diagonals 1/2 differ from the rhombic steel pipes, ribbed GOST 8647-57 [Sal'nikov G. P. quick reference mechanical engineer. - Kyiv: State publishing house of technical literature of the USSR, 1963. - P. 106].
To quantify the reserves of bearing capacity, it is advisable to use a calculation formula of the axial moments of inertia (Ixand IIrhombic (including square) profile
where l is the length of the median line of the wall, i.e. the line passing through the center of the wall thickness;
t - wall thickness;
n is the smaller and more b, n=a/b.
For thin-walled tubular cross section rhombic shape with respect to the diagonals 1/2 (n=0,5)
For thin-walled tubular cross-section square shape
If you enter the parameters of tonkostennoy characteristic of closed gotowanych profiles (l/t=25...50) [the�T Ρ 54157-2010. Shaped steel tubes for structural steelwork. Technical conditions. - M.: Standartenfuhrer, 2010. - S. 14-23], it is obvious that the rhombic element moment of inertia of the cross section increases intimes, and the flexibility is reduced totimes, where- the radii of inertia of the cross section rhombic and square tubes, respectively.
Thus, rhombic profile allows you to increase the bearing capacity of the upper (compressed) zone and flattening nodes in the farm ensures the centering of the non-faceted connections to the grid elements on the inner side and with ledgers on the outside. Such flattening brings the nodes of the belt to the hinges in the plane of the farm and hard (frame) mounts from the plane of the structure.
The effectiveness of the rhombic profile, flattened in places of joints, in relation to the bottom (stretched) belt tubular farms can be increased if a large diagonal cross-sectional positioning of the plane design, and less - in the plane, which will significantly increase the stiffness of the axial plane (mounting rigidity) and reduce braced elements. This design technique should be extended to the expanded tubular grid elements of the farm in which the efforts of compression and extension are alternated throughout the length of about�ETA.
The proposed technical solution is illustrated graphic material, where Fig. 1 shows a portion of a farm based coating with a triangular lattice; Fig. 2 - piece of farm run-through cover with diagonal lattice; Fig. 3 shows the top node of the farm belt with a triangular lattice, a side view; Fig. 4 - Assembly lower belt triangle girders, side view; Fig. 5 - unit upper belt farm with diagonal grate, side view; Fig. 6 is a bottom node of the farm belt with diagonal grate, side view.
The proposed technical solution tubular farm rhombic profile with respect to the diagonals of the cross section includes upper 1/2 (compressed) zone 1, the bottom (stretched) belt 2 stretched braces 3 triangular or diagonal lattice and compressed struts 4 triangular grid or rack 5 diagonal grid. At the nodes of the upper belt to the farm can lean runs of roll-formed sections 6 or with the angled short stacks 7 runs of rolled sections 8. The core elements of the upper belt 1, and short struts 4 and the rack 5 are cross-section, the larger screen which is located in the plane of the farms (construction), and lower out-of-plane. The core elements of the lower belt 2 and braces 3 are cross-section, the larger screen which is located from the plane of the farms (construction), and lower in the plane. In the places provided about�preparation under non-faceted hub connection zones with the lattice rods between them, rhombic profile belt elements tapers with the formation of the grounds, is necessary and sufficient for easy placement, alignment and secure fastening of all converging at each node of elements (including details of false ceilings, suspended cranes, utilities, process equipment, etc.). Rhombic profile truss elements of the lattice after the flattening in the right places double bends give a V - or W-shaped (zigzag) shape.
The formation of the transitional and tapered portions of the rod elements of the tubular section belts and lattice between them is recommended with the provision of the sloped transition piece 1/6 1/4... [1. Trofimov, V. I., A. M. Kaminsky Light metal structures of buildings and structures: textbook. - M.: Publishing house of the DIA, 2002. - P. 152; 2. J. A. Packer, J. Wardenier, X.-L. Zhao, G. J. van der Vegte and Y. Kurobane. Construction with hollow steel sections. Design Guide for rectangular hollow section (RHS) joints under predominantly static loading. CIDECT, 2009. - P. 102]. Along the lines of the double bends are formed of leaf hinges, the distance between which you can pick up from the condition of absolute alignment non-faceted farm nodes as with triangular lattice and diagonal. Between these hinges tapered section rhombic profile grille reinforces the same plot rhombic profile ring element, while simultaneously providing necessary and �residual weld placement. The latter should be calculated only on the difference of effort in the adjoining braces 3 and 4, the triangular lattice or the brace 3 and the rack 5 diagonal, and they can be made in the most convenient (down) position. In the assembled and welded structures (farm) the optimum angle of inclination of the braces, a triangular lattice is 45...50°, diagonal lattice - 30...35° [Metal structures: a Textbook for high schools / Under the editorship of Y. I. Kudelina. - M.: Izd. Center "Academy", 2002. - P. 267].
For comparison of the proposed (new) technical solutions with known as the base object adopted three variants of steel truss industrial building with a span of 18 m from closed gotowanych profiles.
1. Rafter farm gotowanych profiles of rectangular (square) cross section [Kuzin N. I. Design and calculation of steel trusses coatings industrial buildings: a tutorial. - M.: Publishing house of the DIA, 1998. -S. 157-172].
2. Farm of square pipes (profiles) [Kuznetsov, A. F., Kuznetsov V. A. Farm of square pipes. Patent No. 116877, 10.06.2012, bull. No. 16].
The material consumption of the alternatives compared in the following table which shows that in the new solution it is reduced by about 3.26... at 11.23%.
Thus, the proposed technical solution allows depending on certain design decisions in the selection of the relationship of the diagonals of the rhombic cross section of the pipes (closed g�towarnych profiles), as well as the location of these diagonals in the axial plane structures (farm) or from the plane considering the sign of efforts to bar elements (tension or compression) to adjust the stress-strain state of the structure. Such regulation ensures optimization of physico-mechanical properties and techno-economic characteristics of load-bearing structures of buildings and structures. This allows you as a source of blanks for rhombic profile to apply the corresponding size of square pipes, which can lead to additional positive effect. As factory compounds such preparations is quite applicable welded joints with longitudinal slits [Marutyan S. A., Kobalia T. L., Pavlenko, Y. I. Welded butt joint of tubular rods. Patent No. 2429329, 20.09.2011, bull. No. 26], which are easier to place in areas free from the flattening. In core elements of the lattice of characters of alternate efforts, so after flattening square billets is advisable to extrude in the same sequence with the required location is great and shorter diagonals of the cross section in-plane and out-plane design.
Farm rhombic tubes
Farm of tubular elements, comprising a belt and tightly cover up�captive to them bars, made with tapered ends of the curved elements of the V - or W-shaped (zigzag) shape, characterized in that the rods of the farm made rhombic shape with respect to the diagonals 1/2, where the compressed rods larger diagonal is located in the plane of the structure, the smaller diagonal of the plane, and all tie bars the lower diagonal is located in the plane of the structure, and large - from the plane, wherein the upper and lower sashes in the field of non-faceted adjacency lattice tapered.
SUBSTANCE: modular construction structure comprises flexible belts made of wire-rope guys, stiff longitudinal elements, made of separate sections, each comprising a rod, and stiff spacers connected to these sections that combine longitudinal elements with flexible belts. Each section of the longitudinal element is connected stiffly with two spacers lying on one straight line, forming flat modules in the form of letter "T", combined by links retained in design position by wire-rope guys connected hingedly with supports and adjacent modules.
EFFECT: simplified structural solutions, expanded area of application of construction structures, reduced costs for manufacturing and installation of structures.
SUBSTANCE: invention relates to the field of construction and may be used in assembly of trussed girders in covers of buildings and structures of various purpose. The method of assembly includes the following operations: prior to transportation of a girder to a construction site, its stands are fixed to the beam with mounting hinges, then during assembly of the girder the stands are turned along the axis of the beam around assembly hinges to achieve orthogonal position relative to the beam. The stands are turned with an assembly rope with the help of a tightening accessory.
EFFECT: reduced costs for transportation of a trussed girder to a construction site and its simplified assembly.
SUBSTANCE: metal structure with a grid from closed bent-welded shapes includes belts of tubular cross section and a grid rigidly fixed to them, made with flattened ends from bent elements of V- or W-shaped (zigzag-shaped) contour, rod elements of the grid have a tubular cross section of rhombic shape with the ratio of diagonals 1/2, where the larger diagonal is arranged in the plane of the structure, and the smaller one - from the plane.
EFFECT: increasing bearing capacity of a structure with reduced consumption of its structural material.
11 dwg, 1 tbl
SUBSTANCE: blank from a rolled section, having a solid wall and two parallel shelves, is cut along the wall. Two parts with ledges are created, in which the outer edge has larger size compared to the base. The cut blank is divided into two parts, the produced parts are shifted in the transverse direction. Each ledge of one part is connected to two ledges of the other part. Longitudinal sections of ledge edges consist of three adjacent straight sections. The middle one from the sections is parallel to shelves, and the extreme ones are arranged as the angle to it. One part of the cut blank is prepared in such a way that the shelf is bent convex to the wall. For this purpose V-shaped cuts are arranged in well ledges to the plane of the shelf. Further the shelf is bent to match edges of V-shaped cuts, and these edges are fixed. The other part of the cut blank is prepared in such a way that the shelf is bent concave to the wall. At the same time the ledges of the wall is cut in the middle to the entire height of the wall to the shelf, and cut edges are opened by means of shelf bending. Further an insert is made between these edges and connected by means of welding.
EFFECT: reduced labour intensiveness of manufacturing and assembly.
3 cl, 9 dwg
SUBSTANCE: latticed structure comprises belts and rods of the lattice from paired channel-shaped profiles. Profiles are combined in assemblies by a sheet gusset plate and are connected to each other by means of bolts. In assemblies in areas of belts connection along the length at the ends of belts in their walls there are longitudinal cuts provided. In cuts there are longitudinal ribs arranged, being welded to the sheet gusset plate.
EFFECT: provision of structure rigidity from a plane.
2 cl, 3 dwg
SUBSTANCE: through joist comprises an upper belt, a lower belt and a triangular grid. The upper belt is made of through section from two bars. The lower belt and triangular grid are made of single bars aligned with shelves down. Assembly joints of the joist are made with overlapping of the rods. Slot holes are made in the wall of the lower belt bar, and bar shelves of adjacent braces are inserted in it.
EFFECT: reduced labour intensity of manufacturing.
SUBSTANCE: through joist comprises upper belt, lower belt and braces. Upper belt is arranged of two channels that face each other with walls. Lower belt has triangular contour. Braces are made of channel bar arranged between profiles of upper belt and attached to them with an overlap on bolts with their shelves. Lower belt is arranged of strips. Strips in support unit of joist via insert are attached to walls of belt channel bars. Strips in the middle of their length are tightened with each other. In lower span unit of joist ends of strips are opened and overlapped in pairs on shelves of bracing channels. Gap between channel bars of upper belt on support is less than in span.
EFFECT: reduced labour intensiveness of manufacturing and increased bearing capacity of joist upper belt.
SUBSTANCE: trihedral lattice structure, including belts connected on each face with spreaders and braces by welding. Belts are made of double tees, spreaders - of tees, at the same time spreaders are applied onto double tee shelf back by tee shelf, and with their end are leaned against its wall, braces arranged, for example from angle bar, with their ends are fixed to tee shelves.
EFFECT: reduced labour intensiveness and cost of lattice structure.
SUBSTANCE: method for manufacture of truss frame consists in manufacture of upper belt made of two channels, between walls of which lattice rods are welded in. Then lower belt is welded to ends of lattice rods and structure support units. At first upper belt and structure lattice are assembled in vertical plane in inverted position. Then in structure span straight lower belt is laid on lattice rod ends and welded to lattice rods. Energy introduced in unit from welded joints is used for plastic bending and pressing of lower belt to nearest ends of neighboring lattice rods. Then manufacturing process is repeated. Manufacture of frame structure is completed by insertion of lower belt ends between bars of upper belt.
EFFECT: reduction of manufacture labour intensiveness.
FIELD: technological processes.
SUBSTANCE: method includes breaking-up of initial element along zigzag line with provision of trapeziform bulges, with angle of side walls inclination of 45 degrees, joining along bulges, further breaking-up along serrated line with the right angle between side of teeth that are parallel to side walls of trapeziform bulges and joining of performed elements with the help of isosceles angle bars sections. Total number of trapeziform bulges is 3+2k (k 1, 2, 3...), height of trapeziform bulges is 0.2-0.45h"б", length of smaller base 0.2 h"б", where h"б" - height of initial element section.
EFFECT: reduction of manufacture labour-intensiveness and increase of bearing capacity and wastelessness of production.
SUBSTANCE: unit is made using additional elements of Z-shaped cross section, which are inserted one into the other under a run on a support and are connected to each other and to runs using bolts via oval holes in walls of elements. At the same time forces are transferred directly from an element to an element without loading of fastening elements in oval holes.
EFFECT: increased bearing capacity and reliability of a supporting unit.
SUBSTANCE: unit of connection of tubular rods includes an upper single tubular rod with a horizontal flange at the end and a mating flange, to which ends of several lower tubular rods are fixed at the angle, at the same time ends of flanges along the perimeter are tightened by bolts, besides, the mating flange is made as separate for each lower tubular rod and with a mounting cut, at the same time ends of each tubular rod are additionally equipped with two vertical flanges, which at the outer and inner side are tightened by bolts with identical flanges of adjacent ends of tubular rods.
EFFECT: increased strength of a nodal connection under action of horizontal loads.
SUBSTANCE: contact screw butt joint of precast reinforced concrete columns includes end portions of joining columns and an embedded part placed in the lower end portion of the upper column, made in the form of an end plate with corner holes for anchor studs and equipped with angle elements to form niches, to which anchor bars are welded. In the upper end portion of the lower column there is another embedded part in the form of the end plate with the anchor studs for coupling and adjusting nuts, mounted coaxially with the holes in the end plate of the embedded part in the lower end portion of the upper column. A reinforced concrete key in the form of a truncated pyramid is located in the lower end portion of the upper column, and a groove for the reinforced concrete key is made in the upper end portion of the lower column, at that the central hole is made in the embedded part, the sizes of which correspond to the sizes of the larger base of the reinforced concrete key, and the central hole corresponding to the sizes of the open side of the groove is made in the other embedded part.
EFFECT: increase of the bearing capacity of the column and its butt joints.
SUBSTANCE: flanged joint includes joined elements with bevelled ends and flanges welded to them with stops and openings for bolts. Each flange has a rectangular opening with rounded angles, besides, the longitudinal axis of the opening and the longitudinal axis of the stop are matched with the longitudinal axis of the flange, and one end of the stop and short side of the rectangular opening are matched with each other and the transverse axis of the flange. In the assembled form the stop enters the opening of the adjacent flange with gaps at three sides and tightly to the short side of the opening matched with the transverse axis of the flange. Flanges are connected to each other by tightening bolts arranged symmetrically relative to axes of the flange.
EFFECT: increased reliability of a flanged connection with simultaneous reduction of material consumption.
SUBSTANCE: method to connect belt rod elements of a truss structure, according to which belt rod elements are connected to appropriate connection rod elements and/or with appropriate belt rod elements of the truss section. Ends of all rod elements are made with self-stopping thread. In each pair of connected elements thread at their ends is made as differently directed, and their ends are placed in contact to each other due to turning of tightening connection couplings onto ends of elements.
EFFECT: increased reliability of connection, simplified assembly of a structure.
2 cl, 2 dwg
SUBSTANCE: nodal connection includes connection angles rigidly fixed to vertical walls of rods with end plugs and shelves joined on bolts. Same connection angles with shelves joined by bolts are rigidly fixed on horizontal walls (shelves) of rods. At the same time vertical and horizontal walls of connected rod elements in the range of their attachment to leaves of connection angles are reinforced from inside with membranes arranged in parallel to end plugs.
EFFECT: increased bearing capacity of nodal connection.
SUBSTANCE: connection method involves overlapping of ends of thin-walled elements with walls on a sheet gusset plate, installation of the central bolt in the pre-drilled holes in the walls of the thin-walled elements and the gusset plate, setting of the required connection angle, final tightening of the central bolt and installation of self-drilling bolts. Before installing the centre bolt between the walls of the thin-walled elements, a nut and a head of the central bolt, convex sheet parts are installed, and final tightening of the central bolt is stopped when the edges of the sheet parts are thrust against the shelves of the connected thin-walled elements.
EFFECT: increase of the assembly bearing capacity.
2 cl, 5 dwg
SUBSTANCE: mounting assembly of a framework made of channel beams contains the rising upper flange made of two channel beams or C-shaped profiles, oriented with their walls to each other and connected to beams, with location of the bottom flange made of two channel beams between the channel beams of the rising upper flange and connected by bolts or welding. The mounting assembly has two trapezoidal sheet gusset plates or wedge-shaped volume gusset plates in the form of a bent channel beam of variable height, attached by vertical planes to webs of the channel beams of the lower framework flange and rested against the walls or bottom webs of the channel beams of the upper flange.
EFFECT: increase of the bearing capacity of frameworks made of the channel beams by reducing the bending stresses in the framework flanges.
SUBSTANCE: nodal joint of a rod space structure includes discs tightened with a pin pulled via central holes of discs. Between the discs there are tips of belt and diagonal rods. The nodal joint is equipped with a binding ring arranged between discs, coaxially with them, with a pin pulled through it. Each tip of the belt rod is made in the form of a hook, the horn of which is directed towards one of the discs and comprises an axis arranged perpendicularly to the axis of the belt rod, and each tip of the diagonal rod is made in the form of a hook, the horn of which is directed towards the other disc and comprises an axis arranged as inclined towards the axis of the diagonal rod. Horns of all hooks are arranged in the hole of the binding ring around the pin.
EFFECT: reduced labour intensiveness and higher reliability of a nodal joint.
9 cl, 6 dwg
SUBSTANCE: invention relates to the field of construction, namely, to units of connection of tubular rods, which are implemented when manufacturing supports of power transmission lines, cellular communication supports, etc. The unit of coupling of tubular rods includes an upper single tubular rod, to the end of which a horizontal flange is fixed, and a response flange, to which at the angle there are ends of lower tubular rods fixed. The response flange is made as separate for each lower tubular rod. Besides, at the end of each tubular rod there are two vertical flanges on each one, being tightened by bolts with similar flanges of adjacent ends of the lower tubular rods. The horizontal and response flanges along the perimeter are tightened by bolts.
EFFECT: increased stiffness of a unit.
2 cl, 4 dwg
FIELD: building, particularly connections specially adapted for particular building parts or for particular building structures and units.
SUBSTANCE: method involved using embedded members made as metal cylindrical cartridges arranged in concrete body of units to be connected in joint area thereof and metal connection member. Cylindrical cartridge interior is previously filled with adhesive composition. One end of connection member is placed in metal cartridge of the first unit to be joined, another end is inserted in that of the second one. Flange is welded to metal cartridge end. Flange is bored at 40° - 50° for the depth of 0.5 - 0.7 of flange thickness and conical flange bore passes into cylindrical one having dimension corresponding to metal connection diameter, which forms fixing clawing funnel. Ratio between inner cartridge diameter and connection member diameter is equal to dc,in/dcm = 1.5 - 2.0, where dc,in is inner cartridge diameter, dcm is metal connection diameter. Wherein resting outline is formed in area of metal cartridge abutment to flange. Resting outline has ledge of not less than 5 mm when connection member diameter is 10 - 30 mm, which prevents shear deformation development, increases squeezing degree and blocks metal connection. Cartridge has length Lc = (10-12)·dcm, which prevents slip of metal connection.
EFFECT: simplified assemblage technology.