Ridge joint

FIELD: construction industry.

SUBSTANCE: ridge joint consisting of wooden bars the ends of which are mated angle-wise in relation to each other and secured with connecting plates differs in the fact that bars section is made in the form of I-beam profile the web of which is made of at least two veneer sheets located with a gap and secured to each other with transverse stiffeners. Flanges are made in the form of bars fixed along longitudinal ends of sheets. At that web and flange ends of bars abut each other, besides connecting plates are located in the gap between veneer sheets as well and touch their external surface, and joint area is fixed with tightening elements. Besides longitudinal stiffeners attached to sheets surfaces are arranged in the space between veneer sheets. Connecting plates are made from veneer of the same thickness like thickness of webs, and have V-shaped outline. Joint is provided with additional connecting plate fixed on external side of flanges joint. Besides vertical and metal rod being more preferable is fixed in joint plane.

EFFECT: providing high strength and stiffness of bars connection, and minimising consumption of construction materials at increased bearing capacity.

7 cl, 3 dwg

 

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

Famous ridge site (Design of glued wooden structures: Textbook. the allowance. C. The design of frames with curved sections and arches / Entero, Udilnikov, edited Antonova; SPb. state architect.-builds. UN-so - SPb., 1999 - pp.92, RIS, and that includes laminated wooden elements and tiled hinge. Design tile joint is a welded shoes connected with glued wooden elements with pegs.

The disadvantage of this analogue is a significant intensity and lack of reliability and durability, as welded shoes, reinforced ribs, essentially, are hard punches. In the wood, under the edges of the welded boots, there are significant concentrations of normal and shearing stresses, which may lead to delamination.

Famous ridge site (Cormack LI, Walentynowicz A. Design of glued wooden structures. - Kiev: Budivelnik, 1983 - s., 42, a - prototype), includes wood rods, the ends of which are joined at an angle to each other and bonded butt pads. One drawback of the prototype is its lack of reliability and durability, because of its design the glue is haunted wooden elements are connected by a hinge in the form of a cylindrical liner, inserted in the grooves in the ends of the glued wooden elements are connected to each other by means of a piece of strip steel with bolt. In this regard, the use of cylindrical liner leads to the appearance in the wood splitting stresses directed across the grain, and shear stress along the fibers, which leads to splitting and chipping. Thus, the ridge site has low reliability and durability, as well as a significant mass of elements, which enable the connection of significant weight. In addition, the bolts weaken the cross-section of connected elements, which reduces their carrying capacity.

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

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 butt site high high stiffness). 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 problem ridge site, containing wooden rods, the ends of which are joined at an angle to each other and fastened to the butt plates, characterized in that the cross section of the rods attached to the profile I-beam, the wall of which is made of at least two plates of plywood placed with a gap and bonded to each other through transverse ribs attached to both plates and shelves made in the form of bars, attached along the longitudinal edges of the plates on their outer side, with the ends of the shelves and walls of the rods operty each other, in addition, pads and placed in the gap between the plates of plywood, and in contact with their outer surface, while the section of the joint over the entire area of splices and on the whole thickness of this section of the stitched tie elements, for example screws. In addition, in the gap between the plates of plywood, along their longitudinal edges, posted by longitudinal ribs connected with the respective surfaces of the plates. In addition, joint plates made of plywood the same thickness as used for the manufacture of the wall. In addition, butt pads, attached V-shaped contours on the form of the ridge, and the ends of the inner lining operty transverse ribs, and the length of the outer lining exceeds the distance between transverse stiffeners, closest to the intersection. In addition, the Assembly is provided with additional butt plate made of a material, the stretch resistance of which is use, than the material of the rods is fixed on the outer side of the junction shelves experiencing tensile forces. In addition, the pads and the corresponding plate at the site of junction of the additionally sealed with glue. In addition, in the plane of the fixed node craving, preferably vertical and made of metal.

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

Symptoms "section of the rods attached to the profile I-beam, the wall of which is made of at least two plates of plywood placed with a gap and bonded to each other through transverse ribs attached to both plates and shelves made in the form of bars, attached along the longitudinal edges of the plates on their outer side, shall ensure the generation of 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) Ave the same time, ensuring the strength of the splicing rods due to the "interpenetration" in the junction of the inner and outer pads abutting areas without a significant increase of the consumption of these sites.

While the presence of transverse ribs provides consistency of operation of the elements of the pivot - plates and bars, i.e. their work as members of one of the building structure, and overall increase the strength characteristics of the profile.

Signs of "the ends of the shelves and walls of the rods operty each other," provide a reduction of the specific compressive loads on the ends of the rods in the zone of their contact.

Signs "plates and placed in the gap between the plates of plywood, and in contact with their outer surface, 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.

Symptoms "section 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 provide the redistribution of loads experienced by the ridge of the roof, on a fairly extensive section of the rods.

Signs "in the gap between the plates of plywood, along their longitudinal edges, posted by longitudinal ribs connected with the respective surfaces of the plates to provide consistency of operation of the elements of the beam - plates and bars, the arrangement of the longitudinal ribs in the area of "shelves" of the profile rods increases the resistance moment of the cross section, i.e. provides General is improving its strength characteristics.

Signs of "butt pads are made of plywood, the same as used for the manufacture of wall simplify the preparation of production and optimize the strength characteristics of the lining from the standpoint of minimizing material consumption section of the interface.

Signs indicating that "butt pads attached to V-shaped contours on the form of the ridge, and the ends of the inner lining operty transverse ribs, and the length of the outer lining exceeds the distance between transverse stiffeners, closest to the junction provide performance lining features of the bonding interface and the functioning of the site as part of the framework. In addition, it is possible to perception part of the bending loads shelves profile and the redistribution of loads experienced by the ridge of the roof, on a large plot design.

Signs of the Assembly is provided with additional 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 of the junction shelves experiencing a tensile load" and signs "pads and the corresponding plate at the site of the junction is additionally bonded by adhesive to provide increased durability of the joint.

Signs of "in plane site fixed rod, preferably vertical is flanged and is made of metal make it possible to provide an additional point of support for the underlying.

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

In the drawings shows a wooden rods, which given the profile of the beam, the wall of which is made of at least two plates 1 plywood placed with a gap 2 and bonded to each other through transverse ribs 3, bonded to both plates. Shelves "I-beams" in the form of bars 4, the ends of the shelves 5 and the ends of the walls 6 of the rods placed in contact with each other. In addition, it is shown lining 7 (internal - placed in the gap 2 between the plates 1 plywood pads 8 (external - placed in contact with the outer surface of the plates). The plates attached to V-shaped contours on the form of the ridge, while the pads 7 and 8 in width corresponds to the width of the plates 1, the remaining free. Butt pads 7 and 8 are made of plywood the same as used for making the walls of the rod. It is advisable that the ends 9 of the inner plates 7 were operty in the transverse ribs 3, next to the junction. It is advisable that the length of the outer lining 8 exceeded the distance between the transverse ribs 3, closest to the intersection. The plot of the joint over the entire area of abutment plates 8 and throughout the entire thickness of this section sewn with ainime elements 10, for example, screws.

In addition, shows the additional butt plate 11 made in the form of a thin metal plate and fixed on the outer side of the joint bars, experiencing a tensile load. In addition, in the gap 2 between the plates of plywood 2, along their longitudinal edges, shows a longitudinal ribs 12, bonded to the respective surfaces of the plates 1.

In addition, it is shown thrust 13, preferably vertical and made of metal passed through a through hole made in the plane of the hub and fixed, for example, nuts placed on the end of the thrust threaded (the last elements 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 at the time of hardening the adhesive. For the manufacture of shelves 2 and 3 cross and longitudinal 12 ribs use wood not below 2nd grade softwood (except larch) according to GOST 8486-86 with dimensions 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 promatory the crystals of 2-nd class. 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.

Bruski 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 immersed edges (about 33 MPa and not less than 24 MPa);

- when submerged layer (of the order of 37.5 MPa and not less than 27 MPa).

For manufacturing plates 1 and, if necessary, and transverse 3, 12 and longitudinal stiffeners are used plywood brand PSF grade not below/BB GOST 3916.1-89 thickness of 8 and 10 mm

The transverse ribs 3 are placed along 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 due is to 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; neprokleennye sites 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 fire through the deep impregnation compositions diammonium phosphate (ammonium phosphate) ammonium sulfate, borax with boric acid in the ratio of 1:1 or the other for animi compounds with similar properties.

The finished product is Packed and shipped to the consumer.

The formation of the ridge site includes sawing the ends of the rods at an angle that provides the specified angle of the roof ridge and the preparation of the plates 7 and 8. Next, assemble the node - stack bars on its side on a flat surface, connect with each other the ends of their shelves 5 and the ends of the walls 6, a gap of 2 rods (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 okonomiyaki truss, including the declared site, it is used for forming the frame of the roof of the building. This process differs from the conventional technology 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. Ridge site, containing wooden rods, the ends of which are joined at an angle to each other 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 at least two plates of plywood placed with a gap and bonded to each other through transverse ribs attached to both plates and shelves made in the form of bars, attached along the longitudinal edges of the plates on their outer side, with the ends of the shelves and walls of the rods operty each other, in addition, pads and placed in the gap between the plates plywood, and in contact with their outer surface, while the section of the joint along the entire area of the butt on ladok and throughout the entire thickness of this section of the stitched tie elements, for example, screws.

2. Ridge node according to claim 1, characterized in that the gap between the plates of plywood, along their longitudinal edges, posted by longitudinal ribs connected with the respective surfaces of the plates.

3. Ridge node according to claim 1, characterized in that the joint plates are made of plywood the same thickness as used for the manufacture of the wall.

4. Ridge node according to claim 1, characterized in that butt pads attached to V-shaped contours on the form of the ridge, and the ends of the inner lining operty transverse ribs, and the length of the outer lining exceeds the distance between transverse stiffeners, closest to the intersection.

5. Ridge node according to claim 1, characterized in that the Assembly is provided with additional 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 of the junction shelves experiencing tensile forces.

6. Ridge node according to claim 1, characterized in that the lining and the corresponding plate at the site of junction of the additionally sealed with glue.

7. Ridge node according to claim 1, characterized in that the plane of the fixed node craving, preferably vertical and made of metal.



 

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