Bars joint in straight beam

FIELD: construction industry.

SUBSTANCE: invention refers to construction industry, and namely to wooden bar connections. Bars joint in a straight beam comprise bars with alternating-type section which are consequently located and the edges of which are connected, and tightening elements. Web of second-type bars has the same number of veneer sheets as web of first-type bars does, but plus one more sheet. Sheets are arranged in bars structure with the gap equal to thickness of sheets in the bars construction of the bar type connected thereto. If bar construction has at least two veneer sheets, they are attached to each other with transverse stiffeners located in the gap between sheets. End of first-type bars which is directed into the gap between veneer sheets of second-type bars has no appropriate sections of longitudinal blocks, and ends of the rest block sections abut against ends of second-type bars blocks facing them.

EFFECT: improving bending strength of connection.

6 cl, 3 dwg

 

The invention relates to the construction and can be used in the construction of low-rise buildings with wooden frame.

Known to the node connecting rods, comprising a core in the form of hexahedra with holes in the sides and associated bolts the ends of the rods. The core is made hollow and in it, there is at least one face, and part of the remaining side faces are provided with slots. The ends of the rods are made with the screw holes and installed bolts (see patent SU, 1753953, CL EV 1/58, 1992).

The disadvantage of this construction site is the structural complexity of the site (intended for use as a spatial unit), also formed by means of the design cannot be used as a horizontal load-bearing beams.

The closest analogue, taken as a prototype of the present invention is the node connecting rods in a straight beam containing sequentially placed rods, coupled with ends, and the clamping elements (see EN 2109113, EV 1/58, EV 1/26, 1998).

The disadvantage of the prototype is low joint strength rods with the formation of unsupported horizontal load-bearing beams.

Solved technical problem - increasing the carrying capacity of the junction of the rods with the formation of unsupported th is izontally carrier beams.

The technical result obtained by the solution of the problem, expressed in enabling effective use of the structure during the formation of the skeleton (with high bending strength of the joining node). In addition, ensure the most efficient use of material structure, i.e. a combination of minimizing the consumption of materials at high load bearing capacity.

To solve this task, the node connecting rods in a straight beam containing sequentially placed rods, coupled with ends, and clamping elements, characterized in that the beam formed from rods of alternating types-section, the cross section of the rods attached to the profile I-beam, the wall of which is made of at least one plate of plywood, and shelves made in the form of bars, attached along the longitudinal edges of the plate and the wall of the second type of terminals includes one plate of plywood larger than the wall of the first type terminals, and construction of rods plates are placed with a gap equal to the thickness of the plates used in design of a joined-type terminals, in addition, if a web design is not less than two plywood plates they are bonded to each other through transverse ribs, placed in the gap between the plates and replenish with them, with the end of the first-type cores missed in the gap between the plywood plates of the second type terminals, deprived of the relevant sections of the longitudinal bars, and the ends of the remaining sections of the bars operty addressed to them in the ends of the bars of the second type terminals, in addition, the area of the joint over the entire area and all its thickness stitched coupling elements, for example screws. In addition, the gap between the plates along their longitudinal edges, an additional bars, bonded to both plates. In addition, the junction of the rods reinforced butt plate made of a material, the stretch resistance of which is higher than that of the material of the rods is fixed on the outer side rods experiencing a tensile load. In addition, the face edges of the plates of plywood that make up the wall of the first type terminals, operty in the transverse ribs. In addition, the interface is equipped with a thrust, preferably vertical, for example, made of metal. In addition, the area of the joint is additionally sealed with glue.

Comparative analysis of the characteristics of the claimed solution with the characteristics of the prototype and analogues demonstrates compliance of the claimed solution to the criterion "novelty".

The characteristics of the characterizing portion of the claims, solves the following functional tasks.

Signs of a beam formed from crucial is her alternate types section, in this case, the cross section of the rods attached to the profile I-beam, the wall of which is made of at least one plate of plywood, and shelves made in the form of bars, attached along the longitudinal edges of the plate and the wall of the second type of terminals includes one plate of plywood larger than the wall of the first type terminals, and construction of rods plates are placed with a gap equal to the thickness of the plates used in the design of a joined-type rods, together with signs of "the end of the first-type cores missed in the gap between the plywood plates of the second type terminals, deprived of the relevant sections of the longitudinal bars provide an opportunity the interpenetration of each other joined rods and due to this, the formation of high-strength and lightweight construction the construction of two profiled bars, while it is possible to increase the bearing capacity of the structure as by increasing the height and wall thickness (without fear of buckling walls at loads along the walls of the profile), and increase the moment of resistance of the beam section by increasing the size of the shelves.

Furthermore, signs, indicating that the plates of the second type of rods are placed with a gap equal to the thickness of the plates used in the construction of the first type terminals ensure a tight fit friend the other plates, components interpenetrating each other the ends of the spliced bars.

Signs "in the presence of a web design at least two plates of plywood they are bonded to each other through transverse ribs, placed in the gap between the plates and bonded with them, provide consistency of operation of the rod elements (plates and bars), and the total increase in strength characteristics of the profile, made of rods.

Signs of "the ends of the remaining sections of the bars operty addressed to them in the ends of the bars of the second type terminals provide a reduction in the unit compressive loads on the ends of the bars and limit the possibility of rotation of the bars in the joint.

Symptoms "section of the joint over the entire area and all its thickness stitched coupling elements, for example screws, ensuring the possibility of formation of monolithic (without cavities) of the structure in the joint area when gluing wall and contraction of the design screws and thereby provide redistribution of loads experienced by the intersection of the beam, at a sufficiently extensive the design phase.

Signs of the second claim of the invention increase the moment of resistance of the cross section of the rod.

The signs of the third claim of the invention increase the resistance to bending of the rods.

The signs of the fourth and sixth claims izaberete the Oia increase the strength characteristics of the joint.

The signs of the fifth claim of the invention provide the capability of the suspension beams to the upper structural elements.

Figure 1 schematically shows a longitudinal section of the site; figure 2 schematically presents a cross-section of the rod; figure 3 schematically presents a side view.

In the drawings shows a beam formed of rods of the first 1 and second 2 types section (they are given a profile I-beam, the wall of which is made of plate 3 plywood and shelves made in the form of bars 4, attached along the longitudinal edges of the plate 3). Cross-section similar to and different number of plates 3 plywood used in their construction (in section second type of rods one above the plates 3, than in the cross-section of the first type terminals). Structurally, the bars 4, attached to the outer side of the plates 3, and additional bars 5, fixed in the gap between them, the only difference is the thickness. Plates are placed with a gap 6, equal to the thickness of the plates used in the construction of interacting with the type of rods, in addition, if a web design is not less than two plywood plates they are bonded to each other through transverse ribs 7, fastened to plates, in addition, the end of the first type terminals 1, passed through the gap between the plywood plates of the second type of terminals 2, deprived according to the relevant sections of the longitudinal bars 4 and additional bars 5. The ends of the remaining sections of the bars 4 and 5 operty addressed to them in the ends of the bars of the second type of terminals 2. End edge 8 of the plate 3 plywood that make up the wall of the first type terminals, operty in transverse rib 7 that is nearest to the intersection. The plot of the joint over the entire area and all its thickness stitched coupling elements, such as screws 9. The junction of the rods may be reinforced butt plate 10 made of a material, the stretch resistance of which is higher than that of the material of the rods (metal tape)recorded on the outside of the rods experiencing a tensile load.

In addition, it is shown craving 11, preferably vertical and made of metal passed through a through hole made in the plane of the node, and fixed, for example nuts placed on the end of the thrust threaded or connected with the yoke covering the beam (the latter elements are not shown).

The rods are made by gluing in the factory at the stands of known construction, which provides the desired fixation of its elements and their corresponding compression during curing of the adhesive. To produce longitudinal 4, an additional 5 bars and transverse ribs 7 use wood not below 2nd grade softwood (except larch) according to GOST 8486-86 with the apostrophes according to GOST 24454-80, with the relevant settlement characteristics SNiP P-25-80. Quantitative parameters of shape defects and machining (pokeronline, the deviation from parallelism of surfaces and edges, wane) should not exceed permissible for lumber 2nd grade. Through cracks appearing on the face are not allowed. Knots, decayed, rotten, and tobacco, as well as dead, located on the edges are not permitted.

Bars 4 and 5 shelves rods are glued in length with a serrated compounds according to GOST 19414-90. The limit values of the bending strength of gear connections must not be lower than: when loading edge about 33 MPa and not less than 24 MPa; when loading plasti - order 37.5 MPa and not less than 27 MPa.

For the manufacture of plates 3 and optionally the transverse ribs 7 and 5 bars use plywood brand PSF grade not below/BB GOST 3916.1-89 thickness of 8 and 10 mm

The transverse ribs 7 are placed on the length of the beam (rod) at a distance from each other in dangerous destruction" sections of the beam determined by the calculation for specific conditions (most appropriate) to ensure "consistency" of the work plate or set this distance on technological considerations based on the minimum number of ribs that provide "consistency" of the plates.

Glue is connected to the I structures should be performed on synthetic adhesives, the relevant SNiP P-25-80. When this adhesive joints must meet the following requirements: the moisture content of the wood parts of the beams before processing protective compounds must be (12±3) %; beams on the quality of adhesive joints shall meet the requirements of GOST 20850-84; the thickness and width of the bonding layer in the zones of the beams should deviate from the rated not more than ±1 mm; the thickness of the adhesive layers in the elements of structures shall be not more than 0.5 mm are Allowed plots of thickness up to 1 mm, if their length does not exceed 100 mm, and the distance between them is not less than ten times the length of these layers; not glued areas are not allowed.

The finished design if necessary, subjected to a protective and/or decorative treatment to protect them from moisture, biodeterioration, combustion, and chemical corrosion, as well as giving them the necessary aesthetic appearance. These works are carried out on the manufacturer. Protection as possible from one, and from these effects, which is governed by the operating conditions of the structures. While beams for buildings V degree of fire resistance must be protected from birthrate term maintenance-free service 50 years, parts VIII-class of service conditions - according to GOST 20022.2-80*; wood beams for buildings IV degree of fire resistance must be protected from birthrate and is asgarnia through deep impregnation compositions diammonium phosphate (ammonium phosphate) ammonium sulfate, borax with boric acid in the ratio of 1:1 or other protective compounds with similar properties.

The finished product is Packed and shipped to the consumer.

The formation of the straight beams involves removing sections of the bars 4 and 5. Next, assemble the node - stack rods in length on a flat surface, connect with each other the ends of the bars 4 and 5 and, preferably, the end edge of the first type of terminals 1 and converts it to the surface of the transverse ribs 7 (previously on appropriate surfaces of the mentioned details and/or the surface of the wafer 3 put glue is a synthetic that meets the requirements of SNiP P-25-80). Next within the joint provide compressive efforts perpendicular to the outer surface of the plates, and then "package"that includes plate 3 both terminals, "sew" the entire thickness of the coupling elements, such as screws 9, which have evenly over the entire area of the joint. Further, the junction enhance placement and fixation screws additional joint plates 10 on the outer side of the junction of rods experiencing a tensile load.

It is advisable Assembly site to carry out industrially. After Assembly shaped design, including the declared site, it is used for forming the frame of the roof of the building. This processorsocket from conventional technologies with the exception of having to use a powerful lifting equipment in connection with the low weight of the frame.

In the process of perception node structural loads its elements provide the framework as a whole.

In addition, varying the number of plates and stiffeners in structure design, can be varied within wide limits the carrying capacity of structures (while maintaining the same width of the plates, i.e. the height of the wall profile).

1. The node connecting rods in a straight beam containing sequentially placed rods, coupled with ends, and the clamping elements, wherein the beam is formed from rods of alternating types-section, the cross section of the rods attached to the profile I-beam, the wall of which is made of at least one plate of plywood, and shelves made in the form of bars, attached along the longitudinal edges of the plate and the wall of the second type of terminals includes one plate of plywood larger than the wall of the first type terminals, and construction of rods plates are placed with a gap equal to the thickness of the plates used in the construction of joined type of rods, in addition, if you have a web design at least two plates of plywood, they are bound to each other through transverse ribs, placed in the gap between the plates and bonded with them, and the end of the first-type cores missed in the gap between the plates f the Nera second type terminals, deprived of the relevant sections of the longitudinal bars, and the ends of the remaining sections of the bars operty addressed to them in the ends of the bars of the second type terminals, in addition, the area of the joint over the entire area and all its thickness stitched coupling elements, for example screws.

2. The node according to claim 1, characterized in that the gap between the plates along their longitudinal edges, an additional bars, fastened together with two plates.

3. The node according to claim 1, characterized in that the junction of the rods reinforced butt plate made of a material, the stretch resistance of which is higher than that of the material of the rods is fixed on the outer side rods experiencing a tensile load.

4. The node according to claim 1, characterized in that the end edges of the plates of plywood that make up the wall of the first type terminals, operty in the transverse ribs.

5. The node according to claim 1, characterized in that the joint is equipped with a thrust, preferably vertical, for example made of metal.

6. The node according to claim 1, characterized in that the area of the joint is additionally sealed with glue.



 

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