RU2529353C1 - Nodal connection of spatial frame rods - Google Patents

Abstract

FIELD: construction.

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.

3 dwg

Description

The proposed technical solution relates to the field of construction and can be used in nodal connections of the core elements of the spatial frame of buildings and structures.

Known is the nodal connection of a two-belt spatial structure with a frame around the ends of the core elements of the belts, in which one of the shelves of each corner gusset is made with a broadening for fastening with the core elements of the grating [Orlik V.M. Nodal connection of spatial bar structures. - Copyright certificate No. 648703, 02.25.1979, bull. No. 7]. The design is assembled on bolts without welding.

The disadvantage of this nodal connection is the need for double cutting of tubular elements, which increases the complexity of manufacturing. In addition, the bolted joints of the corner gussets require compliance with increased accuracy both in the manufacture and installation of structures.

There is a knot of connecting rods of a spatial structure, in which the rod elements are bolted to each other with the help of corner tips and overlays, the corner tips being attached to the ends of the diagonal elements of the lattice, and the overlays to the ends of the horizontal elements of the belts [Khvatkin Yu.S. A node for connecting rods of a spatial structure. - Patent No. 2087634, 08.20.1997, bull. No. 23].

The disadvantage of the connection node is that the rod elements connected in it are not structurally designed in the same way. Some of them have flanges, the other - corner pads, which increases the busyness and complexity of the nodal connection.

The closest technical solution to the proposed (prototype) is the nodal connection of the cross-rod structures, in which the connecting corners rigidly attached to the waist rods are joined together by shelves by means of bolts and placed in the corners formed by the side faces (vertical walls) of the core elements of the rectangular (square) belts ) tubular profiles. In this case, the connecting corners are attached with their feathers to the vertical walls (side faces) so that the shelves docked with bolts are oriented towards the center of the nodal connection [Avanesov SI, Marutyan AS, Sargsyan OV Nodal connection of cross-bar structures. Copyright certificate No. 1428824, 10/07/1988, bull. No. 37].

The disadvantage of the described solution is the flat arrangement of the core elements of the belts, which does not allow its use in the nodal connection of the spatial frame. For their spatial arrangement, an oblique cut is necessary in the feather zones of the connecting corners, which complicates the nodal connection. In addition, the bearing capacity of such a nodal connection in the spatial framework under intense loads, including crane and seismic effects, is limited by the thinness of the bent welded rectangular (square) profiles of the core elements of the belts, which can cause the punching (pulling out) of the wall section of the waist element in contact with the connecting corner .

The technical result of the proposed solution is to expand the scope of the nodal connection of rod elements from rectangular (square) tubular profiles, as well as increasing the bearing capacity, which allows it to be used in spatial frames, including cases of dynamic loads of significant intensity.

The technical result is achieved due to the fact that in the nodal connection of the rods of the spatial frame, including the connecting corners rigidly attached to the vertical walls of the rods with end caps and the shelves docked on the bolts, the same connecting corners with the shelves docked on the bolts are rigidly mounted on horizontal walls (shelves) rods. In this case, the vertical and horizontal walls of the connecting rod elements in the alignment of their attachment to the feathers of the connecting corners are reinforced from the inside by diaphragms parallel to the end caps.

The proposed nodal connection has a fairly universal technical solution. It can be used, for example, in the absence of dynamic loads of significant intensity, including crane and seismic impacts, when the bearing capacity is fully provided without diaphragms, which positively affects both the complexity of the supporting structures and the consumption of structural material. At the same time, it is advisable to make the rods of one of the directions in the nodal joints integral (continuous), thereby reducing the installation time of the spatial frame.

The proposed technical solution is illustrated by graphic materials, where figure 1 shows the nodal connection of the rods of the spatial frame of tubular profiles of square (rectangular) section in disassembled form, axonometry; figure 2 - nodal connection with a solid (continuous) core element of one of the directions in an unassembled form, axonometry; figure 3 is a fragment of the spatial frame in General.

The nodal connection of the rods 1 of the spatial frame from tubular profiles of square (rectangular) section contains connecting corners 2 rigidly attached to their vertical and horizontal walls with welds, the shelves of which are joined on bolts 3 placed in the coaxial holes 4. (In the image of the visible part of the nodal the bolts 3 are not conventionally shown.) The walls of the connecting rods 1 and the connecting corners 2 from the side of their feathers, closer to the center of the nodal connection, are reinforced with end caps E 5. From the pen farther from the center node connection connecting two corners, as well as the wall bars 1, reinforced apertures 6 located in the cavity of each of the tubular elements 5 in parallel stubs.

The reinforcing element of the proposed nodal connection is made in the form of paired, parallel, sheet parts (plugs 5 and diaphragms 6). It differs in this design design from a similar reinforcing element in the form of single diaphragms from the well-known solution of a tubeless truss truss assembly [Levitansky I.V. The node for attaching the braces to the belt of a tubular frameless truss. - Copyright certificate No. 540019, 12/25/1976, bull. No. 47). It is obvious that the installation and welding of end caps 5 must be preceded by the same technological operations with diaphragms 6.

If the intensity of the loads on the spatial frame is such that the bearing capacity of the nodal connections of its rods can be fully achieved without diaphragms 6, then the rod elements 7 of one of the directions should be made integral (continuous) in the connecting nodes.

The connecting corners and their reinforcing elements of the proposed nodal connection of the rods of the spatial frame in assembled form are the basis for the shaping of nodes with spacers, which are nodal reinforcing elements of a geometrically unchanged (triangular) shape, capable of absorbing and transmitting significant forces, including bending and torques.

Claims (1)

The nodal connection of the rods of the spatial frame, including the connecting corners rigidly attached to the vertical walls of the rods with end caps and the shelves docked on the bolts, characterized in that the same connecting corners with the shelves docked on the bolts are rigidly fixed to the horizontal walls (shelves) of the rods, vertical and the horizontal walls of the connecting rod elements in the alignment of their attachment to the feathers of the connecting corners are reinforced from the inside by diaphragms located parallel end caps.

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