RU2763280C1 - Node connection of elements of wooden and metalwood constructions - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the field of construction and can be used when connecting wooden elements in lattice flat and spatial structures. The specified effect is achieved by the fact that in the nodal connection of elements of wooden and metal-wooden structures, including a wooden belt and a lattice element, the wooden belt is equipped with a steel flat rod with a gusset recessed into a blind groove with a hole and is rigidly fixed in it, the steel flat rod is equipped with a distribution plate and a hairpin passing through a through hole in the wooden belt, and the hairpin is screwed to the wooden belt through a distribution washer. The distribution plate follows the contour of the groove 2 and fits snugly into it.

EFFECT: elimination of brittle fracture of the joint, increase in operational reliability, reduction in labor intensity of installation in the design position of a flat steel bar to be glued in, full involvement of the adhesive layer in the work of chipping wood, increase in bearing capacity.

1 cl, 6 dwg

Description

The invention relates to the field of construction and can be used when connecting wooden elements in lattice flat and spatial structures.

Known knot pairing brace with the upper chord of a wooden truss, including the upper chord of the farm, blind groove, glued steel flat rod with a gusset, brace with a glued flat rod (Numerical studies of knots of all-wood trusses on steel glued flat rods / I.I. Lissitzky, V. I. Zhadanov // Bulletin of PSTU - Yoshkar-Ola, 2020. - No. 4. - P. 64 - 77.). Such a connection is capable of receiving, redistributing and transmitting tensile and compressive forces and is applicable in lattice flat and spatial structures.

The disadvantage of this node is the possibility of its brittle fracture from chipping wood (inherent in adhesive bonding of wooden structures as a rigid class), the complexity of installation in the design position when gluing a steel flat rod, as well as the incomplete inclusion of adhesive layers in the work. Incomplete inclusion of the adhesive layers in the work is that when the limiting stresses are reached in the adhesive layer closer to the bottom of the groove, it exhausts its adhesive strength in connection with the steel flat rod and at the first stage of destruction the adhesive strip located closer to the bottom of the groove is torn off.

EFFECT: exclusion of brittle fracture of the joint, increase in operational reliability, reduction of labor intensity of installation of a glued steel flat rod in the design position, full involvement of the adhesive layer in the work of chipping wood, increase in bearing capacity.

The specified technical result is achieved by the fact that in the nodal connection of elements of wooden and metal-wood structures, including a wooden belt and a lattice element, the wooden belt is equipped with a steel flat rod with a gusset, recessed into a blind groove with a hole and is rigidly fixed in it, the steel flat rod is equipped with a distribution plate and a hairpin (studs) passing through a through hole in a wooden belt, and a hairpin (studs) is screwed to a wooden belt through a distribution washer (washers). The distribution plate 8 follows the contour of the groove 2 and fits tightly into it.

The nodal connection of elements of wooden and metal-wood structures includes: a wooden belt 1, a blind groove 2 with a hole (holes) 3 located in a wooden belt 1, a steel flat rod 4 with holes 5, a gusset 6 with a hole 7, a distribution plate 8 and with a hairpin ( studs) 9, installed in a blind groove 2 with holes 3, a lattice element 10 with an eyelet 11 with holes 12, washer (washers) 13, nut (nuts) 14, bolt 15, nut 16.

In FIG. 1 shows an element-by-element set of nodal connection of elements of wooden and metal-wood structures (option with one stud);

in fig. 2 shows an element-by-element set of nodal connection of elements of wooden and metal-wood structures (option with two studs);

in fig. 3 - three-dimensional image of an element-by-element set of nodal connection of elements of wooden and metal-wood structures (option with one pin);

in fig. 4 - three-dimensional image of an element-by-element set of nodal connection of elements of wooden and metal-wood structures (option with two studs);

in fig. 5 shows the nodal connection of the assembled elements of wooden and metal-wood structures (option with one pin);

in fig. 6 shows the nodal connection of the assembled elements of wooden and metal-wood structures (option with two studs).

Assembly order: Steel flat rod 4 is connected to the distribution plate 8, for example, by welding, the stud(s) 9 are attached to the distribution plate 8, for example, by welding. The connected structure is installed in a blind groove 2 with a hole (holes) 3 so that the stud (studs) 9 passes through the hole (holes) 3 through the wooden belt 1. Then the gaps between the walls of the groove 2 and the steel flat rod 4 are filled for rigid fixation, for example, an epoxy adhesive composition. Holes 5 in the steel flat rod 4 are needed to improve the adhesion of the adhesive to the steel flat rod 4. A washer (washers) 13 is installed on the part of the stud (studs) 9 protruding above the edge of the wooden belt 1 and screwed with a nut (nuts) 14. The lattice element 10 is installed in design position on the gusset 6 by aligning the axes of the holes 12 in the lug 11 and holes 7 in the gusset 6. Bolt 15 is installed in the aligned hole, onto which the nut 16 is screwed.

The node for connecting elements of wooden and metal-wood structures works as follows.

The force from the lattice element 10 through the lug 11 is transmitted to the bolt 15 installed in the aligned holes 12 and the hole 7. From the bolt 15 the force is transmitted to the gusset 6 and is distributed along its length. From the gusset 6, the force is transmitted to the glued part of the steel flat rod 4, then to the wooden belt 1. Holes 5 in the steel flat rod 4 are needed to increase the adhesion of the adhesive to the steel flat rod 4. Stud(s) 9, in case of brittle fracture of the adhesive joint, perceives the force and transfers it to the nut (nuts 14). From the nut (nuts) 14, the force is transmitted to the washer (washers) 13. The washer (washers) 13 distributes the received force and transfers it to the wooden belt 1.

The proposed connection design can be used in the design of joints and ensures the operability of the structure under complex types of stress-strain state.

Thus, in comparison with the prototype, the inventive node for connecting elements of wooden and metal-wood structures, while reducing the complexity of installing a glued steel flat rod in the design position, eliminates brittle fracture of the connection, increases operational reliability, fully involves the adhesive layer in the work of chipping wood, increases the bearing capacity .

Claims (1)

Nodal connection of elements of wooden and metal-wood structures, including a wooden belt with a blind groove, a steel flat rod glued into it with a gusset for attaching a lattice element, characterized in that the steel flat rod glued into the wooden belt is welded to the distribution plate and at least one stud and inserted into the groove in the wooden belt so that the distribution plate is located at the bottom of the groove, and at least one pin passes through at least one hole made in the groove of the wooden belt.

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