Load-carrying structure with frame from oval tube
SUBSTANCE: load-carrying structure with a frame from an oval tube includes flanges and a frame rigidly attached to them and provided with flattened ends from bent elements of zigzag shape; with that, rod-like elements of the frame have an oval cross-section with the ratio of overall dimensions of 1/2.5, where larger dimension is located in the plane of the structure and the smaller one is located out of the plane.
EFFECT: increasing carrying capacity of the structure with reduction of consumption of its structural material.
4 dwg, 2 tbl
The proposed technical solution relates to the construction, namely the lengthy construction load-bearing lattice structures of pipes, and can be used in the fabrication of trusses, girders, columns, arches, frames and other frame systems. Tubular construction designs feature a high technical-economic characteristics as a structural material (steel, aluminum alloy, plastic, composite, polymer, synthetic, etc.) 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 higher education institutions. / 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 higher education institutions. / Edited by 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 dia�of ETP pipe belt. In farms of rectangular (square) tubes such restriction 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. 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; 2. 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; 3. Zinkova V. A. Solodov, N. In. Investigation of the stress-strain state of non-faceted nodes tubular fer�. - Modern problems of science and education. - Penza: Publishing house "Academy of natural Sciences", 2013, No. 6. - S. 205-212]. 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 �of eseni is of high hardness non-faceted nodal connections of tubular trusses [A. A. Pokrovsky The integration 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 stiffness of the nodes, building norms and rules are recommended to perform the calculation of tubular trusses articulated by the scheme provided that the ratio of the height of the cross section to the length of the truss elements does not exceed 1/15 1/10...[SNiP P-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 supporting structure with the lattice oval pipe is a metal structure with the lattice of closed rhombic bend�weld profiles. Design includes belt tubular rectangular (including square) cross-section and is rigidly attached to the bars, made with the flattened ends of the curved elements of the V - or W-shaped (zigzag) shape. Core grid elements have a 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 [A. Marutyan, S. I. ECB Metal construction with a lattice of rhombic closed gotowanych profiles. Patent No. 2500863, 10.12.2013, bull. No. 34].
This technical solution, the inherent disadvantage of the known tubular trusses from rectangular, square, pentagonal, pentagonal, rhombic profile, reduce the resource bearing capacity of the structure and increases its consumption of materials due to the angularity of the listed forms of cross sections involving high stress concentration.
The technical result of the proposed solutions is to increase the bearing capacity of the structure with the reduction of its structural material.
Said technical result is achieved in that the supporting structure including belts and rigidly attached to the bars, made with the flattened ends of the curved elements zigzag shape, rod-like elements R�lattice have an oval cross-section with the ratio of size 1/2,5, where greater clearance is located in the plane of the structure, and less from the plane.
The proposed supporting structure of the upper and lower belts, as well as triangular or diagonal bars between them are made of tubular profiles. For immediate contiguity to the zones with the formation of non-faceted oval pipe nodes of the lattice in specified project areas tapers and double bends give it a zigzag shape. The length of the strip (tape) billet oval profile, you can choose based on the entire length of a structure and its postal stamps. Flattening and double bends oval 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 oval bends of the 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 zag�be tapered sections of oval profile have the greatest stiffness, approximating the stiffness of the mounting frame, which in the supporting structures can be shortened and braced elements, as is done, for example, in the constructions of coverings of the type "Tagil" [Metal structures. In 3 V. V. 2. Steel frame buildings and structures. (Designer's manual). / 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 of oval shape with respect to size 1/2,5 where greater clearance is located in the plane of the structure, and the smaller of the plane. Moreover, the value of the radius of gyration larger envelope exceeds the sum of the radius of gyration is similar to a round profile that Oprah�specific way contributes to the further reduction of the material of load-bearing structures. In addition, the oval profile of the proposed supporting structure with respect to size 1/2,5 differ from oval pipes according to GOST R 54157-2010 [GOST R 54157-2010. Shaped steel tubes for structural steelwork. Specifications - M: standartenfuhrer, 2011. - S. 55-61]. They are also distinguished from the other known technical solutions, whereby to increase the carrying capacity of a cylindrical pipe on a bend it is crimped by deforming into an oval profile with respect to the dimensions 1/3 [1. Nezhdanov K. K., Kuzmeski A. A., Ruble, S. G. New effective profiles. - Izvestiya vuzov. Construction, 2005, No. 10. - Pp. 117-120; 2. Nezhdanov K. K., V. A. Tumanov, Nezhdanov A. K., Ruble, S. G. Method of increasing the bearing capacity of cylindrical pipe bending. Patent No. 2304479, 20.08.2007, bull. No. 23].
The proposed technical solution is illustrated graphic material, where Fig. 1 shows a portion of the supporting structure with the lattice oval pipe; Fig. 2 is a cross section of the supporting structure; Fig. 3 shows the block diagram of the cross section of the oval tube; Fig. 4 - General view of the oval profiles.
The proposed technical solution supporting structure includes upper (compressed) zone 1, the bottom (stretched) belt 2, and the connecting bars 3 zigzag shape from oval tube. The oval cross section of the pipe is picked up with respect to dim�tov 1/2,5, where greater clearance is located in the plane of the structure, and the smaller of the plane. In places provided for the project under the non-faceted hub connection zones with the lattice, the oval profile of lattice 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.). The oval profile of the truss elements of the lattice after the flattening in the right places double bends attach zigzag shape.
The formation of the transitional and tapered portions of the rod elements of the tubular section of the grating 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 non-faceted alignment of the nodes of the supporting structure (farm), with a triangular lattice and diagonal. Between these hinges Splus�nny oval profile plot grid shelf supports ring element, at the same time providing the necessary and sufficient weld placement. The latter should be calculated only on the difference of effort in the adjacent rods, and they can be made in the most convenient (down) position.
To output these relations and quantitative resource assessment of bearing capacity, it is advisable to use a calculation formula of the axial moments of inertia (I0Xand I0Yand cross-sectional area A0oval tubular profile [Guide designer industrial, residential and public buildings and structures. Computational and theoretical. Is 2 kN. KN. 1. Ed. by A. A. Uman. - M.: Stroiizdat, Moscow (1972). - S. 364]:
whereand- smaller cross-sectional dimensions of the oval pipe;
b - larger cross-sectional dimensions of the oval pipe;
t - wall thickness oval pipe.
To the radii of inertia along the principal Central axes differed between each other twice (i0X=2i0Y) corresponding to the moments of inertia must differ by four times, i.e., I0X=4I0Y.
If we substitute the values of moments of inertia, the relationship of smaller size to a larger (n=a/b) can be obtained cubic equation
From these roots is of practical interest to the latter, the value of which 100(0,402801-0,4)/(0,402801...0,4)=0,695...0,700-protsentnoy error can be rounded to n3=0,4=1/2,5, thereby obtaining a given ratio.
Further the calculated results more visible when using a tubular profile of circular cross-section [Handbook on strength of materials. / ANS. edited by G. S. Pisarenko - Kiev: Nauk. Dumka, 1988. - P. 60-61]:
where d is the diameter of a round pipe.
The length of the oval L can be calculated by the formula [Korn G., Korn T., Properties of circles, ellipses, hyperbolas and parabolas. / The Handbook of mathematics. - M.: Nauka, 1978. - S. 70-73]:
When n=0,4 (a=0,4 b or 2,5a=(b) L=11,50aor L=4,60 b, and for n=1 (d=(a=b) L=2πd=6,28 (d, thena=0,5461 d and b=1,356 d.
Thus, for oval pipe with respect to the dimensions of its cross section 0,5461/1,365=1/2,5 can be written:
I0X=(π/32)b2t(3a+b)=(3,14/32)(1,356 (d)2t(3·0,5461 d+1,365 (d)=0,5491 d3t;
I0Y=(π/32)a2t(3b+and)=(3,14/32)(0,5461 d)2t(3·1,365 d+0,5461 d)=0,13582 d3t;
A0=(π/2)t(a+b)=(3,14/2)t(0,5461 d+1,365 (d)=3,000427 dt,
I0X/I0Y=0,5491/0,13582=4,249≈4, with error 0,619...0,623%;
i0X/i0Y=0,4278/0,2128=2,0103≈2, with error 0,512...0,515%,
where the inaccuracy of calculating the area of cross-sections oval and round pipe of the same conditional slab amounted to A0/AO=3,000427/3,14=0,956, and the radius of gyration in the plane of the supporting structure has increased in the i0X/iOX=0,4278/0,3536=1.21 times.
If you enter the parameters of tonkostennoy round tubes t/d=1/100 1/10..., the ratio of calculated values of space sections and the increase of the radius of gyration should be modified accordingly to these parameters, i.e.
Thus, the resource carrying capacity (sustainability) of the truss elements of the lattice of oval pipe ceteris paribus increases of at least 1.2...1.3 times.
The correctness of the calculation of the provisions is confirmed by the example using round tubes of the beam elements from the range of structural systems in architecture "Kislovodsk" [Studs and hub system elements MARCHI / TU 5285-001-47543297-09. - M., 2009]. Settings 11 calibers tubular sections (round and derived oval), collected in table 1 clearly illustrate the applicability and usability of all of the calculations.
For comparison of the proposed (new) technical solutions with known as the base object� taken 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 with orthorhombic lattice of pipes [Marutyan A. C, S. I. ECB Metal construction with a lattice of rhombic closed gotowanych profiles. Patent No. 2500863, 10.12.2013; bul. No. 34].
3. Farm with a lattice of round tubes.
The material consumption of the compared variants are shown in table 2, which shows that the new decision it has the minimum value.
Thus, the proposed technical solution allows depending on certain design decisions in the selection of the relationship of the dimensions of the oval cross section of the pipes and the location of these dimensions in the axial plane structures (farm) to regulate 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 oval profiles to apply the corresponding in caliber round pipe, which can lead to additional positive effect. As factory compounds such preparations is quite applicable welded with�ice 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.
The supporting structure with the lattice oval pipe, including belt and rigidly attached to the bars, made with the flattened ends of the curved elements zigzag shape, characterized in that the core elements of the lattice are oval in cross-section with the ratio of size 1/2,5 where greater clearance is located in the plane of the structure, and the smaller of the plane.
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
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
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.
FIELD: building, particularly means for connecting building structures.
SUBSTANCE: joining device comprises several similarly sized members overlapped so that non-contacting parts are spaced apart. The members are connected with bolt. Connection parts of each member are formed as rimmed orifice having extension and depression with central aperture. Bend is made on one member side. Extension and depression may be shaped as cone, ball or truncated pyramid and formed on one or both member ends. Bolt has a cavity, outer contour of bolt head mates that of inner depression.
EFFECT: reduced labor inputs for building structure mounting and demounting.
2 cl, 4 dwg
FIELD: building, particularly for forming wooden arches, frames and trusses.
SUBSTANCE: ridge unit comprises adhesive-bonded wooden members, hinge and covering members. Unit is provided with glass-fiber plates defining curvilinear section in plane and glass-fiber semispherical heads arranged in glass-fiber plate centers. Semispherical heads are inserted in depressions made in glass-fiber centering rim. The rim edges are inserted in slots of wooden covering members. Glass fibers in curvilinear plates are oriented along plate height and width of adhesive-bonded wooden member ends. The plates does not project beyond boundaries of above ends.
EFFECT: increased strength and reduced material consumption.
FIELD: building, particularly to produce light building structures, namely in building site.
SUBSTANCE: connection includes ends of members to be connected, tightening bolts with washers. Conical depression and conical boss are formed in washer surfaces facing each other. When nut is tightened on tightening bolt the members are jammed in conical cavity between the washers.
EFFECT: increased load-bearing capacity of the connection.
3 cl, 3 dwg
FIELD: building, particularly to create rod structures of pipes.
SUBSTANCE: butt-joint comprises tubular rod ends, ribs and tightening bolts. The ribs are inserted in cuts made in tubular rods and connected one to another in crossing areas along the full length thereof. Flanges are spaced from tubular rod ends.
EFFECT: reduced flange mass.
2 cl, 4 dwg
FIELD: building, particularly to connect arch members during movable building erection.
SUBSTANCE: joint connection comprises arch member ends with fastening members fixedly connected to arch member ends, cylindrical joint insert with two side covering members connected thereto and tightening bolts. The fastening members are made as pipe cuts. The side covering members are provided with coaxial orifices arranged along a circle. Fastening members pass through the coaxial orifices.
EFFECT: simplified production and increased accuracy of joint connection assemblage.
FIELD: building, particularly to connect rod members of building structure with triangular three-layered roof deck panels.
SUBSTANCE: joint connection comprises three-dimensional hollow member to connect rods of triangular grid. The hollow member is solid and defines hexagon. The hollow member has one truncated end. The hollow member comprises support panel made as round plate with U-shaped spaced apart clips fixedly connected to plate along plate perimeter. The clips are adapted for deck panels connection. Triangular three-layered panels are overlapped and connected one to another. Mounting covering strips are connected to ends of all panels so that one strip end is flush with upper rib surface, another strip end is inserted in U-shaped clip.
EFFECT: increased load-bearing capacity of the structure.
FIELD: building, particularly means to reinforce timber structures along with member connection on head block.
SUBSTANCE: reinforcement unit comprises compressed rod, belt and reinforcing side covering plates. The plates are made of angle bars and provided with transversal diaphragms. Side covering plates enclose belt section corners and pass through slots made in compressed rod.
EFFECT: increased load-bearing capacity, prevention of head block unit deformation and shearing.
SUBSTANCE: pipe junction comprises ends of pipes that are set one in the other, face plug, slots made in the pipe of greater diameter, and connecting member secured to the pipes by welding. The connecting member is made of a ring member mounted at the end of the pipe of smaller diameter, and the slots in the pipe of greater diameter do not reach the end of the pipe.
EFFECT: enhanced strength and simplified manufacturing of the joint.
FIELD: metal truss building, particularly to erect bridge span structures.
SUBSTANCE: joint includes a number of segments and connection pipes. The joint is formed as two stamped halves connected with each other by welds to form cylindrical connection pipes provided with flanges. The flanges are welded to the connection pipe ends.
EFFECT: improved manufacturability and operational reliability.