Bar construction joint

FIELD: construction industry.

SUBSTANCE: invention refers to construction industry, and namely to wooden bar construction joints. Bar construction joint consists of two wooden in cross section I-beam bars connected to each other with straps; at that end of the first bar is connected with longitudinal edge of the second one. Bar web is made from veneer sheets located with a gap and attached to each other with transverse stiffeners, and their flanges are made in the form of blocks. Number of veneer sheets of second bar construction equals to that of veneer sheets of first bar construction plus one more sheet, and at that if bar construction consists of not less than two veneer sheets, the latter are located with a gap equal to thickness of plates of bar construction attached thereto. Veneer sheets are connected to each other with transverse stiffeners. End of the first bar passing through the gap between veneer sheets of second bar has no flanges, and edges of the rest flange sections bear against second bar flange surface facing them. Thickness of blocks fixed in the space between sheets complies with thickness of veneer used for sheets manufacturing. Inserts made from veneer are arranged in space between veneer sheets of second bar. Straps made from veneer are located on external side of second bar sheets.

EFFECT: improving strength and rigidity of joint.

6 cl, 3 dwg

 

The invention relates to the construction and can be used in the manufacture of wooden arches, frames and trusses.

Known node truss construction comprising upper and lower bars connected at an angle by its notches. To increase the carrying capacity of the connections, apply the pads to be installed on both sides of the site and attached to both terminals. Pads can be made from either steel or wood. The mounting pads may be made of the clamping bolts, nails or spikes formed by the cover plate (see Atlas of wooden structures. Cgets and other M: C/I. 1985, pp.182).

A disadvantage of this device is the large number of pins in both terminals, which reduces their carrying capacity, reducing the cross-sectional area net.

Also known node truss structures containing two wooden rod connected so that the end of the first of them is connected with a longitudinal edge of the second and bonded butt pads (see EN 2179613, CL EC 3/12, EV 1/58, 2002).

The disadvantage of the prototype is described significant weight design and poor use of the material rods from a position of strength - low ratio of the magnitude of load to the cross-sectional area of the rods and the inevitable decrease in strength and the second is terina, in which "cut" the first rod, which reduces the carrying capacity of the node.

Solved technical problem is to provide high load bearing capacity of the node core design.

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 strength and high stiffness of the node connecting rods). 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 the tasks node of a core structure containing two wooden rod connected so that the end of the first of them is connected with a longitudinal edge of the second and bonded butt plates, characterized in that the cross section of the rods attached to the profile I-beam, the wall of which is made of sheets of plywood, and shelves made in the form of bars, attached along the longitudinal edges of the plates, while in the cross-section of the second rod, the number of plates of plywood per unit is greater than the number plates of plywood used in the construction of the first rod, and in the presence of a web design at least two plates of plywood they are placed with a gap equal to the thickness of the plates used in the construction of the joint is imago with him rod, and plates of plywood connected to each other through transverse ribs attached to them, in addition, the end of the first rod, passed through the gap between the plates of plywood the second rod, stripped the shelves, and the ends of the remaining sections of shelves operty addressed to them in the shelf surface of the second rod, in addition, the area of the joint along the entire area of the splices and the entire thickness of this section of the stitched tie elements, for example screws. In addition, the shelf is made in the form of bars, attached along the longitudinal edges of plates from both their sides, and the thickness of the bars is fixed in the gap between the plates corresponds to the thickness of the plywood used for the manufacture of the plates. In addition, the length of splices exceeds the distance between transverse stiffeners, closest to the junction of the rods. In addition, the interface is equipped with a thrust, preferably vertical, for example, made of metal. In addition, in the gap between the plates of plywood the second rod in contact with the longitudinal edges of the walls of the first rod placed liners, made of plywood corresponding to the thickness of such plates, and the outer side plates of the second rod is placed butt pads, made of the same plywood. In addition, the end of the first rod, passed through the gap between the plates Fane is s the second rod, made flush with the surface of the respective shelves of the second rod.

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 - "the cross section of the rods attached to the profile I-beam, the wall of which is made of sheets of plywood, and shelves made in the form of bars, attached along the longitudinal edges of the plates provide the possibility of forming a high-strength and lightweight construction the construction of two profiled rods, in which case it is possible to increase the bearing capacity of the structure by increasing the height of the wall (without fear of buckling walls at loads along the walls of the profile); increase the moment of resistance of the beam section (by increasing the size of the shelves), while ensuring the strength of the splicing rods, due to the "interpenetration" in the junction of the inner and outer pads dockable stations, without a significant increase of the consumption of these sites.

Signs - "in the cross-section of the second rod, the number of plates of plywood per unit is greater than the number plates of plywood used in the construction of the first rod, and if there is a crucial design which I at least two plates of plywood they are placed with a gap, equal to the thickness of the plates used in the construction joined with him rod provide for the possibility of interpenetration of joined sections of rods each other, provide a tight engagement of the plates and simplify the procedure of organization of such interpenetration.

While the presence of transverse ribs provides consistency of operation of the elements of the pivot - plates and bars, i.e. their function as elements of one of the building structure and higher strength characteristics profile, made of rods.

Signs - "the end of the first rod, passed through the gap between the plates of plywood the second rod, stripped shelves provide the possibility of penetration of the plates constituting the wall of the first type of spliced bars in the gap between the walls (plates) of the second.

Signs - "the ends of the remaining sections of shelves operty addressed to them in the shelf surface of the second rod provide for the reduction of specific compressive loads on the ends of the bars and limit the possibility of rotation of the terminals in the junction.

Signs - "part of the joint over the entire area of splices and the entire thickness of this section, threaded coupling elements, for example screws provide for the redistribution of loads experienced by the node on a fairly extensive section of the rods.

When the Naki second claim reveal the design of the shelf "tee". This simplifies the preparation of production and optimized strength characteristics of the shelves from the standpoint of minimizing material consumption section of the interface.

The signs of the third claim optimize the redistribution of loads experienced by the node.

The signs of the fourth claim of the invention provide the possibility of forming additional points of support for the underlying structural elements.

The signs of the fifth claim of the invention provide the possibility of formation of monolithic (without cavities) of the structure in the joint area with bonding pads with the walls and the contraction of the construction screws.

The signs of the sixth claim of the invention provide longitudinal bracing of the roof frame (connecting neighboring farm) directly addressed to them on the surface of the second type terminals.

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

In the drawings shown first 1 and second 2 wooden rods. The cross section of the rods attached to the profile I-beam, the wall of which is made of plates 3 plywood and shelves made in the form of bars 4 and 5, secured along the longitudinal edges of the plates, while in the second section of the rod 2 number of plates 3 is enery per unit is greater than the number plates of plywood, used in the construction of the first rod 1. If the design of the rods of at least two plates of plywood they are placed with a gap 6, equal to the thickness of the plates 3, used in the construction joined with him, rod, and plate 3 plywood connected to each other through transverse ribs 7, bonded with them. In addition, the end of the first rod 1, passed through the gap between the plates of plywood of the second terminal 2, deprived of shelves, and the ends of the remaining sections of his shelves operty in facing these surface 8 regiments of the second terminal 2. The end face 9 of the end of the first rod, passed through the gap between the plates 3 plywood the second rod 2 made flush with the corresponding shelf 10 of the second rod. In the gap 6 between the plates 3 plywood of the second terminal 2 in contact with the longitudinal edges 11 of the walls of the first rod 1 is placed liners 12, made of plywood corresponding to the thickness of the plates 3. On the outer side of the plates of the second terminal 2 posted by joint plates 13 made of the same plywood. The plot of the joint along the entire area of the butt plates 13 and to the entire thickness of this section is stitched coupling elements 14, such as screws. The thickness of the bars 5, fixed in the gap 6 between the plates 3, corresponds to the thickness of the plywood used for the manufacture of the plates. The length of splices 13 be greater than the tion between the transverse ribs 7, closest to the junction of the rods 1 and 2. In addition, the interface is equipped with a thrust of 15, preferably vertical, for example, made of metal. For this purpose through the junction can be accomplished through hole (not shown) with the possibility of placing and fixing thrust 15.

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 at the time of rejection of glue. To produce longitudinal bars 4 and 5 and the transverse ribs 7 use wood not below 2nd grade softwood (except larch) according to GOST 8486-86 with dimensions according to GOST 24454-80, with the corresponding estimated characteristics of the SNP 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 should not be below:

- when loading edge (about 33 MPa and not less than 24 MPa);

- when loading layer (orado to 37.5 MPa and not less than 27 MPa).

For the manufacture of plates 3 and also, if necessary, and 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 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.

Adhesive joints in structures should be performed on synthetic adhesives that meet the requirements of 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 interlayers;

- not glued castke 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 fire through the 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 node includes sawing the end of the first rod 1 at an angle that provides the specified angle of the roof and removing sections of the bars 4 and 5 with its abutting section and the preparation of the liners 12 and pads 13.

Next, assemble the node - stack bars on its side on a flat surface, connect with each other, the end of the pout terminal 1 is injected to the second terminal 2. The end of the first rod 1, passed through the gap between the plates of plywood of the second terminal 2, deprived of shelves, and the ends of the remaining sections of his shelves operty in facing these surface 8 regiments of the second terminal 2. The ends of their shelves 5 and the ends of the walls 6, a gap of 2 bars (or gap 2, if the number of plates 1 more than two) to impose pads 7, and the outer surfaces of the plates 1 are placed pads 8 (previously on appropriate surfaces of the plates 7 and 8 and/or the surface of the wafer 2 is applied adhesive (synthetic, corresponding SNiP P-25-80)). Next, within the area of the plates 8 provide compressive efforts perpendicular to its outer surface, and then "package"that includes plate 1 and the pads 7 and 8 "sew" the entire thickness of the coupling elements, for example screws, which have evenly over the entire area of the joint. Further, the junction enhance placement and fixation screws for more butt pads 11 on the outer side of the junction of rods experiencing a tensile load. Then, if it is provided by the project through the site known miss rod 13 and fix it.

Appropriate operation of an Assembly 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 process differs tabseparated 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 and the pads 7, 8 and 11 of the support frame 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 core structure containing two wooden rod connected so that the end of the first of them is connected with a longitudinal edge of the second and bonded butt plates, characterized in that the cross section of the rods attached to the profile I-beam, the wall of which is made of sheets of plywood, and shelves made in the form of bars, attached along the longitudinal edges of the plates, while in the cross-section of the second rod, the number of plates of plywood per unit is greater than the number plates of plywood used in the construction of the first rod, and in the presence of a web design at least two plates of plywood, they are placed with a gap equal to the thickness of the plates, used in the construction joined with him, rod, and plate plywood connected to each other through transverse ribs attached to them, in addition, the end of the first rod, passed through the gap between the plates of plywood the second rod, stripped the shelves, and the ends of the remaining sections of shelves operty is addressed to them a shelf surface of the second rod, in addition, the area of the joint along the entire area of the splices and the entire thickness of this section of the stitched tie elements, for example screws.

2. The node according to claim 1, characterized in that the shelf is made in the form of bars, attached along the longitudinal edges of plates from both their sides, and the thickness of the bars is fixed in the gap between the plates corresponds to the thickness of the plywood used for the manufacture of plates.

3. The node according to claim 1, characterized in that the length of the splices exceeds the distance between transverse stiffeners, closest to the junction of the rods.

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

5. The node according to claim 1, characterized in that the gap between the plates of plywood the second rod in contact with the longitudinal edges of the walls of the first rod placed liners, made of plywood, corresponding to the thickness of such plates, and the outer side plates of the second rod is placed butt pads, made of the same plywood.

6. The node according to claim 1, characterized in that the end of the first rod, passed through the gap between the plates of plywood the second rod made flush with the surface of the respective shelves of the second rod.



 

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