ANALYSIS OF FLAWS IN CONNECTION WASHER AND KEY

Ariskin M.V, Kislyakova E.S.

In practice it is often used of two-plane lattice design type (farm, arches, frames) and spatial structure in the form of core structures, domes, folds net vaults, shells, etc. Typically, they consist of a set of rods nevyh elements operating under uniaxial compression, tension and of bending. Constructions of this type allow the implementation of diverse and often more expressive forms of buildings, there are tons of meet modern architectural lines, such as High-Tech, postmodernism and deconstruction, borrowing natural forms. To wooden structures, except notoriously fired requirements (low material and labor, with the main section of uniform strength, fire resistance, reliability, etc.) are increasingly imposed aesthetic requirements, such as invisibility of fasteners in the thickness of connected elements. The latter requirement is mandatory for the repair and strengthening of wooden structures of historic buildings where shall respect the principle of identity.

Existing shortcomings compounds washer vpresovanyh the wood belonging ed I need to have special equipment for fitting washers, cracking, chipping wood danger (even prior to the application of external forces have for pressing) and limited carrying capacity.

Kleestalnaya Disc, on the one hand, and easier to form and the conditions of production, but its carrying capacity is limited even qual ruptcy making connections work on wood chipping within square washers. Spalling same one side is a dangerous operation and fragile wood reducing nnuyu Operation About the structure and reliability. On the other hand, kleestalnye washers are made as plates of rectangular shape, which leads to a lift-off voltages of all the corner portions of the plate s (which are placed to grasp additional screws), and load-bearing capacity washers kleestalnoy determined only work on the adhesive joint spalling.

Existing shortcomings compounds washer vpresovanyh the wood belonging ed I need to have special equipment for fitting washers, cracking, chipping wood danger (even prior to the application of external forces have for pressing) and limited carrying capacity. Moreover, the form of such goals is quite complicated, and its laborious production.

Kleestalnaya Disc, on the one hand, and easier to form and the conditions of production, but its carrying capacity is limited even qual ruptcy making connections work on wood chipping within square washers. Spalling same one side is a dangerous operation and fragile wood reducing nnuyu Operation About the structure and reliability. On the other hand, kleestalnye washers are made as plates of rectangular shape, which leads to a lift-off voltages of all the corner portions of the plate s (which are placed to grasp additional screws), and load-bearing capacity washers kleestalnoy determined only work on the adhesive joint spalling.

All these types of flaws compounds can be significantly eliminated by the use of compounds I glued distinguishing smiling solidity and increased carrying capacity. But Klee s connections are denied, in turn, disadvantages, namely: s high cost of adhesives, the need for special processing lines (plants) for the production of bonded structures.In addition, work on the bonding can be performed only at the factory and construction output in m legged cases requires execution Connects at a construction site, collapsible operations pre-assembly and assembly of structural elements. In such cases, the connection to the mechanical working relationships.

Given the experience of the researchers, given the proposal to develop a compound of wooden structures, which is based on the merits of teamwork metal washers and dowels combined with monolithic laminate composition.

The essence of perfection United soy is as follows: jack under the washer can be chosen slightly larger sizes, which allows free styling that metal washers, and formed the "extra" space in the nest filled polymer compositions which are administered in th slot before installing the washer. After curing adhesive composition Washer securely glued into the wood, allowing it to immediately include s smiling at work, bypassing the process of primitive obmyatiya and compression. This requires a small amount of polymeric adhesive composition and there is no need s special production lines for the manufacture of adhesive joints.

Introduction polymer adhesive composition to a round nest not only allows the puck stick to the wood, but also include fast and complete her work sya Collapse lateral surface after curing of the composition in the nest.

In operation, the exceptional construction of the washer (VS) is located inside timber and has a protective polymer film, which protects against corrosion of the metal washer.

Thus, the proposed new, more perfect union, has, in our view, substantial advantages:

-Ease of fabrication (simple form and ease washers milling washer);

Small-adhesive costs and ease of application;

-High load capacity and low deformability;

- Protection of the polymer film on steel washers metal corrosion;

-A relatively small area of mutual contact (overlap) connected elements;

-The ability to perceive both compressive and tensile forces.

Findings

1. Rational and reliable connection type structures determines the effective and progressive development of the construction of new and reconstruction of existing wooden buildings, so the search is more modern and economic types of compounds is relevant at any stage of the development of wooden structures.

2. Existing connections from the modern requirements and ruggedized low deformability will best respond to the compound adhesives kleemetallicheskih washers, tooth and claw washer ring glued dowels, glued steel pins and some others. However, these compounds can not be considered universal and fully respond to all requirements of modern industrial wooden supporting structures. Important factors in choosing a particular type of compounds in addition to strength and stiffness are manufacturability, collapsible and economy.

3. Search for new solutions of compounds of wooden structures is relevant and is not a closed issue. A new compounds of wooden structures, based on the merits of compounds using dowels, washers, washers kleestalnyh, and eliminates many of their shortcomings. Such compound is bonded to the steel washer.